Implement #12699
This PR exposing Lua os.clock() api for getting the elapsed time of Lua
code execution.
Using:
```lua
local start = os.clock()
...
do something
...
local elpased = os.clock() - start
```
---------
Co-authored-by: Meir Shpilraien (Spielrein) <meir@redis.com>
Co-authored-by: Madelyn Olson <34459052+madolson@users.noreply.github.com>
redis-cli avoids saving sensitive commands in it's history (doesn't
persist them to the history file).
this means that if you had a typo and you wanna re-run the command, you
can't easily do that.
This PR changes that to keep an in-memory history of all the redacted
commands, and just
not persist them to disk. This way we would be able to press the up
arrow and
re-try the command freely, and it'll just not survive a redis-cli
restart.
This PR mainly fixes a possible integer overflow in `json_append_string()`.
When we use `cjson.encoding()` to encode a string larger than 2GB, at specific
compilation flags, an integer overflow may occur leading to truncation, resulting
in the part of the string larger than 2GB not being encoded.
On the other hand, this overflow doesn't cause any read or write out-of-range or segment fault.
1) using -O0 for lua_cjson (`make LUA_DEBUG=yes`)
In this case, `i` will overflow and leads to truncation.
When `i` reaches `INT_MAX+1` and overflows to INT_MIN, when compared to
len, `i` (1000000..00) is expanded to 64 bits signed integer (1111111.....000000) .
At this point i will be greater than len and jump out of the loop, so `for (i = 0; i < len; i++)`
will loop up to 2^31 times, and the part of larger than 2GB will be truncated.
```asm
`i` => -0x24(%rbp)
<+253>: addl $0x1,-0x24(%rbp) ; overflow if i large than 2^31
<+257>: mov -0x24(%rbp),%eax
<+260>: movslq %eax,%rdx ; move a 32-bit value with sign extension into a 64-bit signed
<+263>: mov -0x20(%rbp),%rax
<+267>: cmp %rax,%rdx ; check `i < len`
<+270>: jb 0x212600 <json_append_string+148>
```
2) using -O2/-O3 for lua_cjson (`make LUA_DEBUG=no`, **the default**)
In this case, because singed integer overflow is an undefined behavior, `i` will not overflow.
`i` will be optimized by the compiler and use 64-bit registers for all subsequent instructions.
```asm
<+180>: add $0x1,%rbx ; Using 64-bit register `rbx` for i++
<+184>: lea 0x1(%rdx),%rsi
<+188>: mov %rsi,0x10(%rbp)
<+192>: mov %al,(%rcx,%rdx,1)
<+195>: cmp %rbx,(%rsp) ; check `i < len`
<+199>: ja 0x20b63a <json_append_string+154>
```
3) using 32bit
Because `strbuf_ensure_empty_length()` preallocates memory of length (len * 6 + 2),
in 32-bit `cjson.encode()` can only handle strings smaller than ((2 ^ 32) - 3 ) / 6.
So 32bit is not affected.
Also change `i` in `strbuf_append_string()` to `size_t`.
Since its second argument `str` is taken from the `char2escape` string array which is never
larger than 6, so `strbuf_append_string()` is not at risk of overflow (the bug was unreachable).
* Fix integer overflows due to using wrong integer size.
* Add assertions / panic when overflow still happens.
* Deletion of dead code to avoid need to maintain it
* Some changes are not because of bugs, but rather paranoia.
* Improve cmsgpack and cjson test coverage.
Co-authored-by: Yossi Gottlieb <yossigo@gmail.com>
Apparently for large size classes Jemalloc allocate some extra
memory (can be up to 25% overhead for allocations of 16kb).
see https://github.com/jemalloc/jemalloc/issues/1098#issuecomment-1589870476
p.s. from Redis's perspective that looks like external fragmentation,
(i.e. allocated bytes will be low, and active pages bytes will be large)
which can cause active-defrag to eat CPU cycles in vain.
Some details about this mechanism we disable:
---------------------------------------------------------------
Disabling this mechanism only affects large allocations (above 16kb)
Not only that it isn't expected to cause any performance regressions,
it's actually recommended, unless you have a specific workload pattern
and hardware that benefit from this feature -- by default it's enabled and
adds address randomization to all large buffers, by over allocating 1 page
per large size class, and offsetting into that page to make the starting
address of the user buffer randomized. Workloads such as scientific
computation often handle multiple big matrixes at the same time, and the
randomization makes sure that the cacheline level accesses don't suffer
bad conflicts (when they all start from page-aligned addresses).
However the downsize is also quite noticeable, like you observed that extra
page per large size can cause memory overhead, plus the extra TLB entry.
The other factor is, hardware in the last few years started doing the
randomization at the hardware level, i.e. the address to cacheline mapping isn't
a direct mapping anymore. So there's debate to disable the randomization by default,
but we are still hesitant because when it matters, it could matter a lot, and having
it enabled by default limits that worst case behavior, even though it means the
majority of workloads suffers a regression.
So in short, it's safe and offers better performance in most cases.
This PR is to fix the compilation warnings and errors generated by the latest
complier toolchain, and to add a new runner of the latest toolchain for daily CI.
## Fix various compilation warnings and errors
1) jemalloc.c
COMPILER: clang-14 with FORTIFY_SOURCE
WARNING:
```
src/jemalloc.c:1028:7: warning: suspicious concatenation of string literals in an array initialization; did you mean to separate the elements with a comma? [-Wstring-concatenation]
"/etc/malloc.conf",
^
src/jemalloc.c:1027:3: note: place parentheses around the string literal to silence warning
"\"name\" of the file referenced by the symbolic link named "
^
```
REASON: the compiler to alert developers to potential issues with string concatenation
that may miss a comma,
just like #9534 which misses a comma.
SOLUTION: use `()` to tell the compiler that these two line strings are continuous.
2) config.h
COMPILER: clang-14 with FORTIFY_SOURCE
WARNING:
```
In file included from quicklist.c:36:
./config.h:319:76: warning: attribute declaration must precede definition [-Wignored-attributes]
char *strcat(char *restrict dest, const char *restrict src) __attribute__((deprecated("please avoid use of unsafe C functions. prefer use of redis_strlcat instead")));
```
REASON: Enabling _FORTIFY_SOURCE will cause the compiler to use `strcpy()` with check,
it results in a deprecated attribute declaration after including <features.h>.
SOLUTION: move the deprecated attribute declaration from config.h to fmacro.h before "#include <features.h>".
3) networking.c
COMPILER: GCC-12
WARNING:
```
networking.c: In function ‘addReplyDouble.part.0’:
networking.c:876:21: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
876 | dbuf[start] = '$';
| ^
networking.c:868:14: note: at offset -5 into destination object ‘dbuf’ of size 5152
868 | char dbuf[MAX_LONG_DOUBLE_CHARS+32];
| ^
networking.c:876:21: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
876 | dbuf[start] = '$';
| ^
networking.c:868:14: note: at offset -6 into destination object ‘dbuf’ of size 5152
868 | char dbuf[MAX_LONG_DOUBLE_CHARS+32];
```
REASON: GCC-12 predicts that digits10() may return 9 or 10 through `return 9 + (v >= 1000000000UL)`.
SOLUTION: add an assert to let the compiler know the possible length;
4) redis-cli.c & redis-benchmark.c
COMPILER: clang-14 with FORTIFY_SOURCE
WARNING:
```
redis-benchmark.c:1621:2: warning: embedding a directive within macro arguments has undefined behavior [-Wembedded-directive] #ifdef USE_OPENSSL
redis-cli.c:3015:2: warning: embedding a directive within macro arguments has undefined behavior [-Wembedded-directive] #ifdef USE_OPENSSL
```
REASON: when _FORTIFY_SOURCE is enabled, the compiler will use the print() with
check, which is a macro. this may result in the use of directives within the macro, which
is undefined behavior.
SOLUTION: move the directives-related code out of `print()`.
5) server.c
COMPILER: gcc-13 with FORTIFY_SOURCE
WARNING:
```
In function 'lookupCommandLogic',
inlined from 'lookupCommandBySdsLogic' at server.c:3139:32:
server.c:3102:66: error: '*(robj **)argv' may be used uninitialized [-Werror=maybe-uninitialized]
3102 | struct redisCommand *base_cmd = dictFetchValue(commands, argv[0]->ptr);
| ~~~~^~~
```
REASON: The compiler thinks that the `argc` returned by `sdssplitlen()` could be 0,
resulting in an empty array of size 0 being passed to lookupCommandLogic.
this should be a false positive, `argc` can't be 0 when strings are not NULL.
SOLUTION: add an assert to let the compiler know that `argc` is positive.
6) sha1.c
COMPILER: gcc-12
WARNING:
```
In function ‘SHA1Update’,
inlined from ‘SHA1Final’ at sha1.c:195:5:
sha1.c:152:13: warning: ‘SHA1Transform’ reading 64 bytes from a region of size 0 [-Wstringop-overread]
152 | SHA1Transform(context->state, &data[i]);
| ^
sha1.c:152:13: note: referencing argument 2 of type ‘const unsigned char[64]’
sha1.c: In function ‘SHA1Final’:
sha1.c:56:6: note: in a call to function ‘SHA1Transform’
56 | void SHA1Transform(uint32_t state[5], const unsigned char buffer[64])
| ^
In function ‘SHA1Update’,
inlined from ‘SHA1Final’ at sha1.c:198:9:
sha1.c:152:13: warning: ‘SHA1Transform’ reading 64 bytes from a region of size 0 [-Wstringop-overread]
152 | SHA1Transform(context->state, &data[i]);
| ^
sha1.c:152:13: note: referencing argument 2 of type ‘const unsigned char[64]’
sha1.c: In function ‘SHA1Final’:
sha1.c:56:6: note: in a call to function ‘SHA1Transform’
56 | void SHA1Transform(uint32_t state[5], const unsigned char buffer[64])
```
REASON: due to the bug[https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80922], when
enable LTO, gcc-12 will not see `diagnostic ignored "-Wstringop-overread"`, resulting in a warning.
SOLUTION: temporarily set SHA1Update to noinline to avoid compiler warnings due
to LTO being enabled until the above gcc bug is fixed.
7) zmalloc.h
COMPILER: GCC-12
WARNING:
```
In function ‘memset’,
inlined from ‘moduleCreateContext’ at module.c:877:5,
inlined from ‘RM_GetDetachedThreadSafeContext’ at module.c:8410:5:
/usr/include/x86_64-linux-gnu/bits/string_fortified.h:59:10: warning: ‘__builtin_memset’ writing 104 bytes into a region of size 0 overflows the destination [-Wstringop-overflow=]
59 | return __builtin___memset_chk (__dest, __ch, __len,
```
REASON: due to the GCC-12 bug [https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96503],
GCC-12 cannot see alloc_size, which causes GCC to think that the actual size of memory
is 0 when checking with __glibc_objsize0().
SOLUTION: temporarily set malloc-related interfaces to `noinline` to avoid compiler warnings
due to LTO being enabled until the above gcc bug is fixed.
## Other changes
1) Fixed `ps -p [pid]` doesn't output `<defunct>` when using procps 4.x causing `replication
child dies when parent is killed - diskless` test to fail.
2) Add a new fortify CI with GCC-13 and ubuntu-lunar docker image.
The message "Reading messages... (press Ctrl-C to quit)" is replaced by
"Reading messages... (press Ctrl-C to quit or any key to type command)".
This allows users to subscribe to more channels, to try out UNSUBSCRIBE and to
combine pubsub with other features such as push messages from client tracking.
The "Reading messages" info message is displayed in the bottom of the output in a
distinct style and moves downward as more messages appear. When any key is pressed,
the info message is replaced by the prompt with for entering commands.
After entering a command and the reply is displayed, the "Reading messages" info
messages appears again. This is added to the repl loop in redis-cli and in the
corresponding place for non-interactive mode.
An indication "(subscribed mode)" is included in the prompt when entering commands
in subscribed mode.
Also:
* Fixes a problem that UNSUBSCRIBE hanged when used with RESP3 and push callback,
without first entering subscribe mode. It hanged because UNSUBSCRIBE gets one or
more push replies but no in-band reply.
* Exit subscribed mode after RESET.
Previously, jemalloc was explicitly configured to build in `gnu99` mode. As a result, `<stdatomic.h>` was presumed to be unavailable and never used.
This commit removes explicit build flags configuration and lets `autoconf` determine the supported build flags. In addition, we also no longer build C++ jemalloc code.
Co-authored-by: Yossi Gottlieb <yossigo@gmail.com>
All commands / use cases that heavily rely on double to a string representation conversion,
(e.g. meaning take a double-precision floating-point number like 1.5 and return a string like "1.5" ),
could benefit from a performance boost by swapping snprintf(buf,len,"%.17g",value) by the
equivalent [fpconv_dtoa](https://github.com/night-shift/fpconv) or any other algorithm that ensures
100% coverage of conversion.
This is a well-studied topic and Projects like MongoDB. RedPanda, PyTorch leverage libraries
( fmtlib ) that use the optimized double to string conversion underneath.
The positive impact can be substantial. This PR uses the grisu2 approach ( grisu explained on
https://www.cs.tufts.edu/~nr/cs257/archive/florian-loitsch/printf.pdf section 5 ).
test suite changes:
Despite being compatible, in some cases it produces a different result from printf, and some tests
had to be adjusted.
one case is that `%.17g` (which means %e or %f which ever is shorter), chose to use `5000000000`
instead of 5e+9, which sounds like a bug?
In other cases, we changed TCL to compare numbers instead of strings to ignore minor rounding
issues (`expr 0.8 == 0.79999999999999999`)
* Support BUILD_TLS=module to be loaded as a module via config file or
command line. e.g. redis-server --loadmodule redis-tls.so
* Updates to redismodule.h to allow it to be used side by side with
server.h by defining REDISMODULE_CORE_MODULE
* Changes to server.h, redismodule.h and module.c to avoid repeated
type declarations (gcc 4.8 doesn't like these)
* Add a mechanism for non-ABI neutral modules (ones who include
server.h) to refuse loading if they detect not being built together with
redis (release.c)
* Fix wrong signature of RedisModuleDefragFunc, this could break
compilation of a module, but not the ABI
* Move initialization of listeners in server.c to be after loading
the modules
* Config TLS after initialization of listeners
* Init cluster after initialization of listeners
* Add TLS module to CI
* Fix a test suite race conditions:
Now that the listeners are initialized later, it's not sufficient to
wait for the PID message in the log, we need to wait for the "Server
Initialized" message.
* Fix issues with moduleconfigs test as a result from start_server
waiting for "Server Initialized"
* Fix issues with modules/infra test as a result of an additional module
present
Notes about Sentinel:
Sentinel can't really rely on the tls module, since it uses hiredis to
initiate connections and depends on OpenSSL (won't be able to use any
other connection modules for that), so it was decided that when TLS is
built as a module, sentinel does not support TLS at all.
This means that it keeps using redis_tls_ctx and redis_tls_client_ctx directly.
Example code of config in redis-tls.so(may be use in the future):
RedisModuleString *tls_cfg = NULL;
void tlsInfo(RedisModuleInfoCtx *ctx, int for_crash_report) {
UNUSED(for_crash_report);
RedisModule_InfoAddSection(ctx, "");
RedisModule_InfoAddFieldLongLong(ctx, "var", 42);
}
int tlsCommand(RedisModuleCtx *ctx, RedisModuleString **argv, int argc)
{
if (argc != 2) return RedisModule_WrongArity(ctx);
return RedisModule_ReplyWithString(ctx, argv[1]);
}
RedisModuleString *getStringConfigCommand(const char *name, void *privdata) {
REDISMODULE_NOT_USED(name);
REDISMODULE_NOT_USED(privdata);
return tls_cfg;
}
int setStringConfigCommand(const char *name, RedisModuleString *new, void *privdata, RedisModuleString **err) {
REDISMODULE_NOT_USED(name);
REDISMODULE_NOT_USED(err);
REDISMODULE_NOT_USED(privdata);
if (tls_cfg) RedisModule_FreeString(NULL, tls_cfg);
RedisModule_RetainString(NULL, new);
tls_cfg = new;
return REDISMODULE_OK;
}
int RedisModule_OnLoad(void *ctx, RedisModuleString **argv, int argc)
{
....
if (RedisModule_CreateCommand(ctx,"tls",tlsCommand,"",0,0,0) == REDISMODULE_ERR)
return REDISMODULE_ERR;
if (RedisModule_RegisterStringConfig(ctx, "cfg", "", REDISMODULE_CONFIG_DEFAULT, getStringConfigCommand, setStringConfigCommand, NULL, NULL) == REDISMODULE_ERR)
return REDISMODULE_ERR;
if (RedisModule_LoadConfigs(ctx) == REDISMODULE_ERR) {
if (tls_cfg) {
RedisModule_FreeString(ctx, tls_cfg);
tls_cfg = NULL;
}
return REDISMODULE_ERR;
}
...
}
Co-authored-by: zhenwei pi <pizhenwei@bytedance.com>
Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
Fix Lua compile warning on GCC 12.1
GCC 12.1 prints a warning on compile:
```
ldump.c: In function ‘DumpString’:
ldump.c:63:26: warning: the comparison will always evaluate as ‘false’ for the pointer operand in ‘s + 24’ must not be NULL [-Waddress]
63 | if (s==NULL || getstr(s)==NULL)
```
It seems correct, `getstr(s)` can't be `NULL`.
Also, I see Lua v5.2 does not have that check: https://github.com/lua/lua/blob/v5-2/ldump.c#L63
The white list is done by setting a metatable on the global table before initializing
any library. The metatable set the `__newindex` field to a function that check
the white list before adding the field to the table. Fields which is not on the
white list are simply ignored.
After initialization phase is done we protect the global table and each table
that might be reachable from the global table. For each table we also protect
the table metatable if exists.
`hdr_value_at_percentile()` is part of the Hdr_Histogram library
used when generating `latencystats` report.
There's a pending optimization for this function which greatly
affects the performance of `info latencystats`.
https://github.com/HdrHistogram/HdrHistogram_c/pull/107
This PR:
1. Upgrades the sources in _deps/hdr_histogram_ to the latest Hdr_Histogram
version 0.11.5
2. Applies the referenced optimization.
3. Adds minor documentation about the hdr_histogram dependency which was
missing under _deps/README.md_.
benchmark on my machine:
running: `redis-benchmark -n 100000 info latencystats` on a clean build with no data.
| benchmark | RPS |
| ---- | ---- |
| before upgrade to v0.11.05 | 7,681 |
| before optimization | 12,474 |
| after optimization | 52,606 |
Co-authored-by: filipe oliveira <filipecosta.90@gmail.com>
Reapply this commit on top of hiredis as a local change. Previosuly it
was pulled from a private hiredis branch, which resulted with it going
away on subtree pull.
# Short description
The Redis extended latency stats track per command latencies and enables:
- exporting the per-command percentile distribution via the `INFO LATENCYSTATS` command.
**( percentile distribution is not mergeable between cluster nodes ).**
- exporting the per-command cumulative latency distributions via the `LATENCY HISTOGRAM` command.
Using the cumulative distribution of latencies we can merge several stats from different cluster nodes
to calculate aggregate metrics .
By default, the extended latency monitoring is enabled since the overhead of keeping track of the
command latency is very small.
If you don't want to track extended latency metrics, you can easily disable it at runtime using the command:
- `CONFIG SET latency-tracking no`
By default, the exported latency percentiles are the p50, p99, and p999.
You can alter them at runtime using the command:
- `CONFIG SET latency-tracking-info-percentiles "0.0 50.0 100.0"`
## Some details:
- The total size per histogram should sit around 40 KiB. We only allocate those 40KiB when a command
was called for the first time.
- With regards to the WRITE overhead As seen below, there is no measurable overhead on the achievable
ops/sec or full latency spectrum on the client. Including also the measured redis-benchmark for unstable
vs this branch.
- We track from 1 nanosecond to 1 second ( everything above 1 second is considered +Inf )
## `INFO LATENCYSTATS` exposition format
- Format: `latency_percentiles_usec_<CMDNAME>:p0=XX,p50....`
## `LATENCY HISTOGRAM [command ...]` exposition format
Return a cumulative distribution of latencies in the format of a histogram for the specified command names.
The histogram is composed of a map of time buckets:
- Each representing a latency range, between 1 nanosecond and roughly 1 second.
- Each bucket covers twice the previous bucket's range.
- Empty buckets are not printed.
- Everything above 1 sec is considered +Inf.
- At max there will be log2(1000000000)=30 buckets
We reply a map for each command in the format:
`<command name> : { `calls`: <total command calls> , `histogram` : { <bucket 1> : latency , < bucket 2> : latency, ... } }`
Co-authored-by: Oran Agra <oran@redislabs.com>
msgpack lib missed using lua_checkstack and so on rare
cases overflow the stack by at most 2 elements. This is a
violation of the Lua C API. Notice that Lua allocates
additional 5 more elements on top of lua->stack_last
so Redis does not access an invalid memory. But it is an
API violation and we should avoid it.
This PR also added a new Lua compilation option. The new
option can be enable using environment variable called
LUA_DEBUG. If set to `yes` (by default `no`), Lua will be
compiled without optimizations and with debug symbols (`-O0 -g`).
In addition, in this new mode, Lua will be compiled with the
`-DLUA_USE_APICHECK` flag that enables extended Lua C API
validations.
In addition, set LUA_DEBUG=yes on daily valgrind flow so we
will be able to catch Lua C API violations in the future.
Background:
Following the upgrade to jemalloc 5.2, there was a test that used to be flaky and
started failing consistently (on 32bit), so we disabled it (see #9645).
This is a test that i introduced in #7289 when i attempted to solve a rare stagnation
problem, and it later turned out i failed to solve it, ans what's more i added a test that
caused it to be not so rare, and as i mentioned, now in jemalloc 5.2 it became consistent on 32bit.
Stagnation can happen when all the slabs of the bin are equally utilized, so the decision
to move an allocation from a relatively empty slab to a relatively full one, will never
happen, and in that test all the slabs are at 50% utilization, so the defragger could just
keep scanning the keyspace and not move anything.
What this PR changes:
* First, finally in jemalloc 5.2 we have the count of non-full slabs, so when we compare
the utilization of the current slab, we can compare it to the average utilization of the non-full
slabs in our bin, instead of the total average of our bin. this takes the full slabs out of the game,
since they're not candidates for migration (neither source nor target).
* Secondly, We add some 12% (100/8) to the decision to defrag an allocation, this is the part
that aims to avoid stagnation, and it's especially important since the above mentioned change
can get us closer to stagnation.
* Thirdly, since jemalloc 5.2 adds sharded bins, we take into account all shards (something
that's missing from the original PR that merged it), this isn't expected to make any difference
since anyway there should be just one shard.
How this was benchmarked.
What i did was run the memefficiency test unit with `--verbose` and compare the defragger hits
and misses the tests reported.
At first, when i took into consideration only the non-full slabs, it got a lot worse (i got into
stagnation, or just got a lot of misses and a lot of hits), but when i added the 10% i got back
to results that were slightly better than the ones of the jemalloc 5.1 branch. i.e. full defragmentation
was achieved with fewer hits (relocations), and fewer misses (keyspace scans).
Upgraded to jemalloc 5.2.1 from 5.1.0.
Cherry picked all relevant fixes (by diffing our 5.1.0 to upstream 5.10 and finding relevant commits).
Details of what was done:
[cherry-picked] fd7d51c 2021-05-03 Resolve nonsense static analysis warnings (Oran Agra)
[cherry-picked] 448c435 2020-09-29 Fix compilation warnings in Lua and jemalloc dependencies (#7785) (YoongHM)
[skipped - already in upstream] 9216b96 2020-09-21 Fix compilation warning in jemalloc's malloc_vsnprintf (#7789) (YoongHM)
[cherry-picked] 88d71f4 2020-05-20 fix a rare active defrag edge case bug leading to stagnation (Oran Agra)
[skipped - already in upstream] 2fec7d9 2019-05-30 Jemalloc: Avoid blocking on background thread lock for stats.
[cherry-picked] 920158e 2018-07-11 Active defrag fixes for 32bit builds (again) (Oran Agra)
[cherry-picked] e8099ca 2018-06-26 add defrag hint support into jemalloc 5 (Oran Agra)
[re-done] 4e729fc 2018-05-24 Generate configure for Jemalloc. (antirez)
Additionally had to do this:
7727cc2 2021-10-10 Fix defrag to support sharded bins in arena (added in v5.2.1) (Yoav Steinberg)
When reviewing please look at all except the first commit which is just replacing 5.1.0 with 5.2.1 sources.
Also I think we should merge this without squashing to preserve the changes we did to to jemalloc.
- The argument `u` in for `ar` is ignored (and generates warnings since `D` became the default.
All it does is avoid updating unchanged objects (shouldn't have any impact on our build)
- Enable `LUA_USE_MKSTEMP` to force the use of `mkstemp()` instead of `tmpname()` (which is dead
code in redis anyway).
- Remove unused variable `c` in `f_parser()`
- Removed misleadingly indented space in `luaL_loadfile()` and ``addfield()`
Co-authored-by: Oran Agra <oran@redislabs.com>
There's a rare case which leads to stagnation in the defragger, causing
it to keep scanning the keyspace and do nothing (not moving any
allocation), this happens when all the allocator slabs of a certain bin
have the same % utilization, but the slab from which new allocations are
made have a lower utilization.
this commit fixes it by removing the current slab from the overall
average utilization of the bin, and also eliminate any precision loss in
the utilization calculation and move the decision about the defrag to
reside inside jemalloc.
and also add a test that consistently reproduce this issue.
The redis-cli command line tool and redis-sentinel service may be vulnerable
to integer overflow when parsing specially crafted large multi-bulk network
replies. This is a result of a vulnerability in the underlying hiredis
library which does not perform an overflow check before calling the calloc()
heap allocation function.
This issue only impacts systems with heap allocators that do not perform their
own overflow checks. Most modern systems do and are therefore not likely to
be affected. Furthermore, by default redis-sentinel uses the jemalloc allocator
which is also not vulnerable.
Co-authored-by: Yossi Gottlieb <yossigo@gmail.com>
For a lot of long strings which have same prefix which extends beyond
hashing limit, there will be many hash collisions which result in
performance degradation using commands like KEYS
This is considered a safer approach as it prevents a race condition that
could lead to chmod executed on a different file.
Not a major risk, but CodeQL alerted this so it makes sense to fix.
debing.sun