Hi Shivaprasad.
On 8/27/26 11:13 AM, Shivaprasad G Bhat wrote:
Hi All, Thomas,
On my PPC64 machine, I see the below systemd crash orginating from abort()
during boot on top of the tree. Complete dmesg can be seen here [1]
abort (libc.so.6 + 0x29484)
__libc_message_impl (libc.so.6 + 0x9e00c)
__libc_fatal (libc.so.6 + 0x9e06c)
start_thread (libc.so.6 + 0xadffc)
__clone (libc.so.6 + 0x152d68)
__clone (libc.so.6 + 0x152d68)
create_thread.constprop.0 (libc.so.6 + 0xad9c8)
The git bisect pointed me to commit 3424d8c18a7da "(Merge tag
'core-entry-2026-08-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip)"
Please find the kernel config used to build the kernel at [2].
I have tried applying the pending fixes from Mukesh [3] and Ritesh [4] for the
currently outstanding issues and still see the problem.
The system is running Fedora 42, with glibc-2.41-7.fc42.ppc64le. The
complete list of toolchain and packages can be found here [5]
Thanks and Regards,
Shivaprasad
References:
1 - https://gist.github.com/shivaprasadbhat/6f166374bab12b4f4c1cd4ac829e562c
2 - https://gist.github.com/shivaprasadbhat/aa499468e124015eec5932fb13e88e05
3 - https://lore.kernel.org/linuxppc-dev/[email protected]/#t
4 -
https://lore.kernel.org/linuxppc-dev/[email protected]/
5 - https://gist.github.com/shivaprasadbhat/ae56ca849c3009e8642a6313dc465ea7
=========
Backtrace from dmesg:
[ 22.039343][ T1833] systemd-coredump[1833]: Module
libsystemd-shared-257.6-1.fc42.so from rpm systemd-257.6-1.fc42.ppc64le
[ 22.039378][ T1833] systemd-coredump[1833]: Stack trace of thread 1828:
[ 22.039378][ T1833] systemd-coredump[1833]: Stack trace of thread 1828:
[ 22.039401][ T1833] systemd-coredump[1833]: #0 0x00007fffa4c29484 abort
(libc.so.6 + 0x29484)
[ 22.039401][ T1833] systemd-coredump[1833]: #0 0x00007fffa4c29484 abort
(libc.so.6 + 0x29484)
[ 22.039429][ T1833] systemd-coredump[1833]: #1 0x00007fffa4c9e00c
__libc_message_impl (libc.so.6 + 0x9e00c)
[ 22.039429][ T1833] systemd-coredump[1833]: #1 0x00007fffa4c9e00c
__libc_message_impl (libc.so.6 + 0x9e00c)
[ 22.039461][ T1833] systemd-coredump[1833]: #2 0x00007fffa4c9e06c
__libc_fatal (libc.so.6 + 0x9e06c)
[ 22.039461][ T1833] systemd-coredump[1833]: #2 0x00007fffa4c9e06c
__libc_fatal (libc.so.6 + 0x9e06c)
[ 22.039491][ T1833] systemd-coredump[1833]: #3 0x00007fffa4cadffc
start_thread (libc.so.6 + 0xadffc)
[ 22.039491][ T1833] systemd-coredump[1833]: #3 0x00007fffa4cadffc
start_thread (libc.so.6 + 0xadffc)
[ 22.039521][ T1833] systemd-coredump[1833]: #4 0x00007fffa4d52d68 __clone
(libc.so.6 + 0x152d68)
[ 22.039521][ T1833] systemd-coredump[1833]: #4 0x00007fffa4d52d68 __clone
(libc.so.6 + 0x152d68)
[ 22.039551][ T1833] systemd-coredump[1833]: #5 0x00007fffa4d52d68 __clone
(libc.so.6 + 0x152d68)
[ 22.039551][ T1833] systemd-coredump[1833]: #5 0x00007fffa4d52d68 __clone
(libc.so.6 + 0x152d68)
[ 22.039580][ T1833] systemd-coredump[1833]: #6 0x00007fffa4cad9c8
create_thread.constprop.0 (libc.so.6 + 0xad9c8)
[ 22.039580][ T1833] systemd-coredump[1833]: #6 0x00007fffa4cad9c8
create_thread.constprop.0 (libc.so.6 + 0xad9c8)
[ 22.039614][ T1833] systemd-coredump[1833]: #7 0x00000000003af858 n/a (n/a
+ 0x0)
[ 22.039614][ T1833] systemd-coredump[1833]: #7 0x00000000003af858 n/a (n/a
+ 0x0)
[ 22.039639][ T1833] systemd-coredump[1833]: ELF object binary architecture:
PowerPC64
[ 22.039639][ T1833] systemd-coredump[1833]: ELF object binary architecture:
PowerPC64
[ 22.042109][ T1] systemd[1]: systemd-journald.service: Scheduled restart
job, restart counter is at 1.
I was looking at merge patch and It is possible that TIF_SYSCALL_RET is still
set when it is returned
and maybe causing a mismatch.
Does below help?
---
--- a/arch/powerpc/kernel/syscall.c
+++ b/arch/powerpc/kernel/syscall.c
@@ -19,8 +19,10 @@ notrace long system_call_exception(struct pt_regs *regs,
unsigned long r0)
long ret;
syscall_fn f;
- if (unlikely(!syscall_enter_from_user_mode_randomize_stack(regs, &r0)))
+ if (unlikely(!syscall_enter_from_user_mode_randomize_stack(regs, &r0)))
{
+ clear_thread_flag(TIF_SYSCALL_RET);
return syscall_get_error(current, regs);
+ }
if (unlikely(test_and_clear_thread_flag(TIF_SYSCALL_RET)))
return syscall_get_error(current, regs);
