Comments (5)
Thanks for reporting @drach. I'll look into it.
There is also a chance that the problem lies into fullbench
rather than zstd
.
Since you provide the sample to reproduce the issue, investigation should find it.
from zstd.
I believe to have fixed this issue within latest update of "dev" branch 695a6cb.
The issue was within fullbench
, zstd
library looks unaffected (by this bug).
fullbench
improperly allocated space for the ZSTD_decodeSeqHeaders
test, which was extended by one cell in recent versions of FSE.
Since the issue is not specific to your sample, I'm surprised it has not show up earlier within Continuous Integration tests, as fullbench
is tested with asan
enabled. I suspect FSE dynamically downsizes reference sample statistics as they are generated from a small sample. Side effect : it doesn't test the limits of internal buffers.
If you witness some instability issues outside of fullbench
, it may be related to something else.
from zstd.
Indeed, fullbench
is fixed in "dev", thank you.
If you witness some instability issues outside of fullbench, it may be related to something else.
Agree, will check it closer.
from zstd.
In an existing quite a big iOS app the invocation of ZSTD_decompress (exactly this function, not its internals) may just crash after several dozens of successful calls, it looks like a problem in a corrupted stack.
I was wrong. We call ZSTD_decompress
in different threads, some of them are set up with a 128Kb stack size that turns to be small for a ZSTD context. I was careless to notice it at first because the same code and data worked normally with LZ4 and Zlib's DEFLATE.
from zstd.
Thanks for feedback @drach.
Which reminds me : the decompression context is quite large currently, and it's part of my todo list to tame it.
In the meantime, should you need to keep your stack at 128K per thread, I suggest creating a context per thread with ZSTD_createDCtx()
, and use ZSTD_decompressDCtx()
(which is not yet exposed unfortunately, but present within zstd_decompress.c
). It will avoid usage of the stack.
from zstd.
Related Issues (20)
- ZDICT_trainFromBuffer_cover is not thread safe HOT 17
- zstd compression output differens with the same options between 1.5.5 and 1.5.6 HOT 5
- Warning message for `zstd -v --train` is missing line breaks
- How to accelerate the process of dictionary training in zstd? HOT 5
- tests/cli-tests/cltools/zstdless.sh fails with newer version of less HOT 3
- Please promote thread pools from experimental to stable HOT 1
- The CMake build script breaks check_ipo_supported
- Dynamic decompression HOT 3
- Change `dictionary_compression.c` example to use API for dictionary creation
- Enable weak symbol support for Risc-V? HOT 1
- Possibly missing check for truncated initial states in Huffman weight block HOT 4
- Poor compressor behavior on interleaved data HOT 2
- zstd 1.5.5+ has worse performance on Graviton2 nodes than v1.4.4 HOT 4
- [Not a bug] Dictionary building strategy HOT 7
- CLI: Hang bomb with with crafted circular symbolic link causes "zstd -d -r -f" to infinitely loop. "pigz -d-r -f" skips symbolic links with non compressed suffix
- ZSTD Decompression Speed vs Compression Level HOT 3
- is there a pre-trained version for "english" dictionary for web use? HOT 1
- patch-from in single-thread mode unexpected worse performing than multithread HOT 2
- Consider new release, with #4019 applied
- [reproducibility] Zstd varies compressed output based on the presence of SSE / NEON in some cases HOT 2
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