Re: [Buildroot] [PATCH RFC 1/1] support/testing/tests/package/test_zfs: fix uclibc test by using bleeding-edge toolchain

[Waldemar Brodkorb <wbx@openadk.org>]

Hi,

the bug is known to me. It only happens on aarch64 not on arm.
I have no idea why python3 segfaults. It has something todo with a
TLS bug in uClibc-ng.

best regards
 Waldemar

Vincent Fazio wrote,

> CC: Waldemar
> 
> > -----Original Message-----
> > From: buildroot <buildroot-bounces@buildroot.org> On Behalf Of José
> > Luis Salvador Rufo
> > Sent: Tuesday, May 6, 2025 12:57 PM
> > To: Julien Olivain <ju.o@free.fr>
> > Cc: buildroot@buildroot.org; Vincent Fazio <vfazio@xes-inc.com>
> > Subject: [External] - Re: [Buildroot] [PATCH RFC 1/1]
> > support/testing/tests/package/test_zfs: fix uclibc test by using
> > bleeding-edge toolchain
> > 
> > Hello @Vincent Fazio <vfazio@xes-inc.com> I saw that you submitted a
> > patch a few months ago to fix the thread address error:
> > https://raw.githubusercontent.com/buildroot/buildroot/d63e207eb869063
> > f82c867658676c2903beb08cb/package/python3/0009-Fix-thread-
> > identifiers-on-32-bit-musl-builds.patch
> > 
> > It looks like we might be encountering the same issue again
> > (si_addr=0x7373616c6362760b).
> > Could this be another upstream issue? (see:
> > https://github.com/python/cpython/blob/main/Python/thread_pthread.h#L
> > 312)
> > 
> > What do you think?
> > 
> > Here is the strace output:
> > 
> > 
> > # strace /usr/bin/python3.13
> > execve("/usr/bin/python3.13", ["/usr/bin/python3.13"], 0xffffe7396230
> > /* 10 vars */) = 0
> > readlinkat(AT_FDCWD, "/proc/self/exe", "/usr/bin/python3.13", 4096) =
> > 19 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
> > -1,
> > 0) = 0xffff81806000
> > openat(AT_FDCWD, "/lib/libpython3.13.so.1.0", O_RDONLY) = -1 ENOENT
> > (No such file or directory) openat(AT_FDCWD,
> > "/usr/lib/libpython3.13.so.1.0", O_RDONLY) = 3 fstat(3,
> > {st_mode=S_IFREG|0755, st_size=5357776, ...}) = 0 mmap(NULL, 4096,
> > PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
> > 0) = 0xffff81805000
> > read(3,
> > "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0\267\0\1\0\0\0\0\0\0\0\0\0\0\0"..
> > .,
> > 4096) = 4096
> > mmap(NULL, 5828608, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> > 0xffff81276000
> > mmap(0xffff81276000, 4514232, PROT_READ|PROT_EXEC,
> > MAP_PRIVATE|MAP_FIXED, 3, 0) = 0xffff81276000 mmap(0xffff816c5000,
> > 842184, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x44e000) =
> > 0xffff816c5000 mmap(0xffff81793000, 465896, PROT_READ|PROT_WRITE,
> > MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xffff81793000
> > close(3)                                = 0
> > munmap(0xffff81805000, 4096)            = 0
> > openat(AT_FDCWD, "/lib/libc.so.0", O_RDONLY) = 3 fstat(3,
> > {st_mode=S_IFREG|0755, st_size=723704, ...}) = 0 mmap(NULL, 4096,
> > PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
> > 0) = 0xffff81805000
> > read(3,
> > "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0\267\0\1\0\0\0\0\0\0\0\0\0\0\0"..
> > .,
> > 4096) = 4096
> > mmap(NULL, 761856, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> > 0xffff811bc000 mmap(0xffff811bc000, 714260, PROT_READ|PROT_EXEC,
> > MAP_PRIVATE|MAP_FIXED, 3, 0) = 0xffff811bc000 mmap(0xffff8126b000,
> > 5324, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0xaf000) =
> > 0xffff8126b000 mmap(0xffff8126d000, 34024, PROT_READ|PROT_WRITE,
> > MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xffff8126d000
> > close(3)                                = 0
> > munmap(0xffff81805000, 4096)            = 0
> > openat(AT_FDCWD, "/lib/libc.so.0", O_RDONLY) = 3 fstat(3,
> > {st_mode=S_IFREG|0755, st_size=723704, ...}) = 0
> > close(3)                                = 0
> > newfstatat(AT_FDCWD, "/lib/ld-uClibc.so.0", {st_mode=S_IFREG|0755,
> > st_size=33928, ...}, 0) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE,
> > MAP_PRIVATE|MAP_ANONYMOUS, -1,
> > 0) = 0xffff81805000
> > mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
> > 0) = 0xffff811bb000
> > mprotect(0xaaaade621000, 4096, PROT_READ) = 0
> > mprotect(0xffff816c5000, 323584, PROT_READ) = 0
> > mprotect(0xffff8126b000, 4096, PROT_READ) = 0
> > mprotect(0xffff81812000, 4096, PROT_READ) = 0
> > set_tid_address(0xffff811bb0d0)         = 106
> > set_robust_list(0xffff811bb0e0, 24)     = 0
> > rt_sigaction(SIGRTMIN, {sa_handler=0xffff812224a4, sa_mask=[],
> > sa_flags=SA_SIGINFO}, NULL, 8) = 0 rt_sigaction(SIGRT_1,
> > {sa_handler=0xffff812223bc, sa_mask=[],
> > sa_flags=SA_RESTART|SA_SIGINFO}, NULL, 8) = 0
> > rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0 prlimit64(0,
> > RLIMIT_STACK, NULL, {rlim_cur=8192*1024,
> > rlim_max=RLIM64_INFINITY}) = 0
> > ioctl(0, TCGETS, {c_iflag=ICRNL|IXON|IXOFF,
> > c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR,
> > c_cflag=B38400|CS8|CREAD|HUPCL|CLOCAL,
> > c_lflag=ISIG|ICANON|ECHO|ECHOE|ECHOK|ECHOCTL|ECHOKE, ...}) = 0
> > ioctl(1, TCGETS, {c_iflag=ICRNL|IXON|IXOFF,
> > c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR,
> > c_cflag=B38400|CS8|CREAD|HUPCL|CLOCAL,
> > c_lflag=ISIG|ICANON|ECHO|ECHOE|ECHOK|ECHOCTL|ECHOKE, ...}) = 0
> > getrandom("\xf2\x3f\xe8\x25\xff\x8b\xe6\xb2\xdf\x1b\xc2\x96\x20\x6c\x
> > 16\x55\xae\x06\x7a\xcb\xb5\x99\xbc\xf9\x3c\x21\xfd\x05\x52\xae\xff\x7
> > b",
> > 32, GRND_NONBLOCK) = 32
> > brk(NULL)                               = 0xaaaade623000
> > brk(0xaaaade624000)                     = 0xaaaade624000
> > openat(AT_FDCWD, "/proc/sys/vm/overcommit_memory", O_RDONLY) = 3
> > read(3, "0\n", 32)                      = 2
> > close(3)                                = 0
> > clock_gettime(CLOCK_MONOTONIC, {tv_sec=17, tv_nsec=16727584}) = 0
> > clock_gettime(CLOCK_MONOTONIC, {tv_sec=17, tv_nsec=24778944}) = 0
> > clock_gettime(CLOCK_MONOTONIC, {tv_sec=17, tv_nsec=25320784}) = 0
> > getrandom("\x90\xcb\x78\x23\xee\xdc\x38\x0b\x74\x1a\xf8\x3b\xb2\x54\x
> > fe\xf0\x89\x10\x13\x08\x25\x8b\x45\x98",
> > 24, GRND_NONBLOCK) = 24
> > gettid()                                = 106
> > write(2, "Fatal Python error: ", 20Fatal Python error: )    = 20
> > write(2, "_PyThreadState_Attach", 21_PyThreadState_Attach)   = 21
> > write(2, ": ", 2: )                       = 2
> > write(2, "non-NULL old thread state", 25non-NULL old thread state) =
> > 25 write(2, "\n", 1
> > )                       = 1
> > write(2, "Python runtime state: ", 22Python runtime state: )  = 22
> > write(2, "preinitialized", 14preinitialized)          = 14
> > write(2, "\n", 1
> > )                       = 1
> > write(2, "\n", 1
> > )                       = 1
> > write(2, "Thread 0x", 9Thread 0x)                = 9
> > --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR,
> > si_addr=0x7373616c6362760b} ---
> > +++ killed by SIGSEGV +++
> > Segmentation fault
> > #
> 
> I think this is slightly different in that maybe some TLS slot is dirty https://github.com/python/cpython/blob/fe18437089e6eccfa09e7c12a4f807fc158274ba/Python/pystate.c#L2083
> 
> I don’t remember running into this issue when doing testing for https://gitlab.com/buildroot.org/buildroot/-/issues/95 when I tested all C lib implementations.
> 
> I assume this is failing on 3.12.3?
> 
> 
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