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Description
Nim Version
nim -v
Nim Compiler Version 2.2.4 [Windows: amd64]
Compiled at 2025-04-22
Copyright (c) 2006-2025 by Andreas Rumpf
active boot switches: -d:release
Description
This demo from the Nim std library doc occasionally crashes with exit code 1, or "SIGSEGV: Illegal storage access. (Attempt to read from nil?) " in nim 2.0.16 and nim 2.2.4 with "-d:release --mm:orc --threads:on". There are the same issues with "-d:debug", but it's ok in nim 1.6.20.
The demo source
# Crash with exit code 1, or SIGSEGV: Illegal storage access. (Attempt to read from nil?)
# nim 2.0.16 and 2.2.4 with "-d:release --mm:orc --threads:on" but nim 1.6.20 ok
import locks
var l: Lock
proc threadFunc(obj: ptr seq[int]) {.thread.} =
withLock l:
for i in 0..<10:
obj[].add(obj[].len * obj[].len)
proc threadHandler() =
var thr: array[0..4, Thread[ptr seq[int]]]
var s = newSeq[int]()
for i in 0..high(thr):
createThread(thr[i], threadFunc, s.addr)
joinThreads(thr)
echo s
initLock(l)
threadHandler()
deinitLock(l)Current Output
# The release test
>nim c -d:release --mm:orc --threads:on passptr
Hint: used config file '...\.choosenim\toolchains\nim-2.2.4\config\nim.cfg' [Conf]
Hint: used config file '...\.choosenim\toolchains\nim-2.2.4\config\config.nims' [Conf]
.......................................................................
CC: passptr.nim
Hint: [Link]
Hint: mm: orc; threads: on; opt: speed; options: -d:release
28909 lines; 1.547s; 31.148MiB peakmem; proj: passptr; out: ...\passptr.exe [SuccessX]
>passptr
@[0, 1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144, 169, 196, 225, 256, 289, 324, 361, 400, 441, 484, 529, 576, 625, 676, 729, 784, 841, 900, 961, 1024, 1089, 1156, 1225, 1296, 1369, 1444, 1521, 1600, 1681, 1764, 1849, 1936, 2025, 2116, 2209, 2304, 2401]
SIGSEGV: Illegal storage access. (Attempt to read from nil?)
>passptr
@[0, 1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144, 169, 196, 225, 256, 289, 324, 361, 400, 441, 484, 529, 576, 625, 676, 729, 784, 841, 900, 961, 1024, 1089, 1156, 1225, 1296, 1369, 1444, 1521, 1600, 1681, 1764, 1849, 1936, 2025, 2116, 2209, 2304, 2401]
>passptr
>echo %errorlevel%
-1073741819
>
# The debug test
>passptr
@[0, 1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144, 169, 196, 225, 256, 289, 324, 361, 400, 441, 484, 529, 576, 625, 676, 729, 784, 841, 900, 961, 1024, 1089, 1156, 1225, 1296, 1369, 1444, 1521, 1600, 1681, 1764, 1849, 1936, 2025, 2116, 2209, 2304, 2401]
Traceback (most recent call last)
...passptr.nim(22) passptr
...\.choosenim\toolchains\nim-2.2.4\lib\system.nim(651) threadHandler
...\.choosenim\toolchains\nim-2.2.4\lib\system\alloc.nim(1165) dealloc
...\.choosenim\toolchains\nim-2.2.4\lib\system\alloc.nim(1045) rawDealloc
...\.choosenim\toolchains\nim-2.2.4\lib\system\alloc.nim(602) listRemove
SIGSEGV: Illegal storage access. (Attempt to read from nil?)
Expected Output
# The release test
>nim c -d:release --mm:orc --threads:on passptr
Hint: used config file '...\.choosenim\toolchains\nim-2.2.4\config\nim.cfg' [Conf]
Hint: used config file '...\.choosenim\toolchains\nim-2.2.4\config\config.nims' [Conf]
.......................................................................
CC: passptr.nim
Hint: [Link]
Hint: mm: orc; threads: on; opt: speed; options: -d:release
28909 lines; 1.547s; 31.148MiB peakmem; proj: passptr; out: ...\passptr.exe [SuccessX]
>passptr
@[0, 1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144, 169, 196, 225, 256, 289, 324, 361, 400, 441, 484, 529, 576, 625, 676, 729, 784, 841, 900, 961, 1024, 1089, 1156, 1225, 1296, 1369, 1444, 1521, 1600, 1681, 1764, 1849, 1936, 2025, 2116, 2209, 2304, 2401]
>passptr
@[0, 1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144, 169, 196, 225, 256, 289, 324, 361, 400, 441, 484, 529, 576, 625, 676, 729, 784, 841, 900, 961, 1024, 1089, 1156, 1225, 1296, 1369, 1444, 1521, 1600, 1681, 1764, 1849, 1936, 2025, 2116, 2209, 2304, 2401]
>passptr
@[0, 1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144, 169, 196, 225, 256, 289, 324, 361, 400, 441, 484, 529, 576, 625, 676, 729, 784, 841, 900, 961, 1024, 1089, 1156, 1225, 1296, 1369, 1444, 1521, 1600, 1681, 1764, 1849, 1936, 2025, 2116, 2209, 2304, 2401]
>
Known Workarounds
Using nim 1.6.20
Additional Information
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