[linus:master] [cleanup] 857d18f23a: WARNING:at_arch/x86/mm/fault.c:#do_user_addr_fault

From: kernel test robot

Date: Sun Oct 25 2026 - 23:16:14 EST

Hello,

kernel test robot noticed "WARNING:at_arch/x86/mm/fault.c:#do_user_addr_fault" on:

commit: 857d18f23ab17284d1b6de6f61f4e74958596376 ("cleanup: Introduce ACQUIRE() and ACQUIRE_ERR() for conditional locks") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

[test failed on linux-next/master 20a33c6b6cbe7e4805dfb6cd68816937443aa148]

in testcase: boot

config: i386-randconfig-1000-20261024
compiler: clang-22
test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 4 -m 4G

(please refer to attached dmesg/kmsg for entire log/backtrace)

If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <yi1.lai@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-lkp/202610261034.27b7d516-lkp@xxxxxxxxx

[ 11.566677][ T1] ------------[ cut here ]------------
[ 11.568949][ T1] WARNING: CPU: 0 PID: 1 at arch/x86/mm/fault.c:1276 do_user_addr_fault+0x383/0x400
[ 11.575495][ T1] Modules linked in:
[ 11.577054][ T1] CPU: 0 UID: 0 PID: 1 Comm: init Tainted: G T 6.16.0-rc4-00001-g857d18f23ab1 #1 PREEMPTLAZY a3ef0aab1ee9544918f8c1ad2e4db51d2fe98b85
[ 11.581652][ T1] Tainted: [T]=RANDSTRUCT
[ 11.582645][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 11.585110][ T1] EIP: do_user_addr_fault+0x383/0x400
[ 11.586341][ T1] Code: 00 00 83 c4 04 e9 22 fe ff ff 89 f9 89 da ff 75 e4 e8 11 75 f6 ff 83 c4 04 e9 05 fd ff ff b0 01 84 c0 0f 84 3d fd ff ff eb 02 <0f> 0b 89 f9 eb 1f 8b 45 e8 8b 40 34 f7 d0 a8 03 75 a5 e8 26 cc 31
[ 11.590683][ T1] EAX: 00000000 EBX: 00000000 ECX: 80000000 EDX: 00000000
[ 11.592281][ T1] ESI: 81598000 EDI: 81705ed4 EBP: 81705eb0 ESP: 81705e88
[ 11.593863][ T1] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068 EFLAGS: 00010046
[ 11.595609][ T1] CR0: 80050033 CR2: 00000004 CR3: 6c8c8000 CR4: 000406d0
[ 11.597203][ T1] Call Trace:
[ 11.597982][ T1] exc_page_fault+0x58/0xc0
[ 11.599032][ T1] ? pvclock_clocksource_read_nowd+0x180/0x180
[ 11.600439][ T1] ? entry_INT80_32+0x107/0x107
[ 11.601541][ T1] handle_exception+0x147/0x147
[ 11.602644][ T1] EIP: do_int80_syscall_32+0x1b6/0x340
[ 11.603893][ T1] Code: 5b 5d 31 c0 31 c9 31 d2 c3 e8 a6 3e 00 00 8b 46 0c 8b 08 f7 c1 1e 30 02 00 74 96 89 4e 08 a1 04 80 b6 87 85 c0 74 27 8b 45 00 <8b> 58 04 8b 4e 04 89 da e8 bd c0 8f fe 8b 46 04 89 da 8b 5e 04 e8
[ 11.608196][ T1] EAX: 00000000 EBX: 85200bcb ECX: 00000010 EDX: 00000000
[ 11.609759][ T1] ESI: 81705f70 EDI: 81705fb4 EBP: 81705fac ESP: 81705f30
[ 11.611343][ T1] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068 EFLAGS: 00010002
[ 11.613100][ T1] ? entry_INT80_32+0x107/0x107
[ 11.614207][ T1] ? pvclock_clocksource_read_nowd+0x180/0x180
[ 11.615601][ T1] ? pvclock_clocksource_read_nowd+0x180/0x180
[ 11.616984][ T1] ? do_int80_syscall_32+0x1b6/0x340
[ 11.618174][ T1] ? __this_cpu_preempt_check+0x8/0x40
[ 11.619410][ T1] ? lockdep_hardirqs_on+0x8f/0x140
[ 11.620607][ T1] ? entry_INT80_32+0x107/0x107
[ 11.621712][ T1] ? irqentry_exit+0x2f/0x80
[ 11.622759][ T1] ? exc_page_fault+0x7c/0xc0
[ 11.623844][ T1] entry_INT80_32+0x107/0x107
[ 11.624921][ T1] EIP: 0x77e6f68a
[ 11.625772][ T1] Code: 33 04 00 83 c4 10 85 ed 0f 85 ea 00 00 00 31 d2 b8 78 00 00 00 65 8b 3d 08 00 00 00 bb 11 00 20 01 83 c7 68 89 d1 89 d6 cd 80 <89> c7 3d 00 f0 ff ff 0f 87 71 01 00 00 85 ff 0f 85 99 00 00 00 8b
[ 11.648329][ T1] EAX: 0000004e EBX: 01200011 ECX: 00000000 EDX: 00000000
[ 11.651045][ T1] ESI: 00000000 EDI: 77dbeda8 EBP: 00000000 ESP: 7ff1f900
[ 11.653829][ T1] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b EFLAGS: 00000202
[ 11.656766][ T1] irq event stamp: 106522
[ 11.658497][ T1] hardirqs last enabled at (106521): [<853113c0>] wake_up_new_task+0x100/0x1c0
[ 11.661952][ T1] hardirqs last disabled at (106522): [<86b60949>] do_int80_syscall_32+0x109/0x340
[ 11.665602][ T1] softirqs last enabled at (106504): [<85271c40>] local_bh_enable+0x0/0x40
[ 11.673657][ T1] softirqs last disabled at (106502): [<85271e00>] local_bh_disable+0x0/0x40
[ 11.677104][ T1] ---[ end trace 0000000000000000 ]---
[ 11.679177][ T1] BUG: kernel NULL pointer dereference, address: 00000004
[ 11.681834][ T1] #PF: supervisor read access in kernel mode
[ 11.684116][ T1] #PF: error_code(0x0000) - not-present page
[ 11.686324][ T1] *pde = 00000000
[ 11.687755][ T1] Oops: Oops: 0000 [#1]
[ 11.688761][ T1] CPU: 0 UID: 0 PID: 1 Comm: init Tainted: G W T 6.16.0-rc4-00001-g857d18f23ab1 #1 PREEMPTLAZY a3ef0aab1ee9544918f8c1ad2e4db51d2fe98b85
[ 11.692143][ T1] Tainted: [W]=WARN, [T]=RANDSTRUCT
[ 11.693308][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 11.695611][ T1] EIP: do_int80_syscall_32+0x1b6/0x340
[ 11.696859][ T1] Code: 5b 5d 31 c0 31 c9 31 d2 c3 e8 a6 3e 00 00 8b 46 0c 8b 08 f7 c1 1e 30 02 00 74 96 89 4e 08 a1 04 80 b6 87 85 c0 74 27 8b 45 00 <8b> 58 04 8b 4e 04 89 da e8 bd c0 8f fe 8b 46 04 89 da 8b 5e 04 e8
[ 11.701146][ T1] EAX: 00000000 EBX: 85200bcb ECX: 00000010 EDX: 00000000
[ 11.702701][ T1] ESI: 81705f70 EDI: 81705fb4 EBP: 81705fac ESP: 81705f30
[ 11.704284][ T1] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068 EFLAGS: 00010002
[ 11.705989][ T1] CR0: 80050033 CR2: 00000004 CR3: 6c8c8000 CR4: 000406d0
[ 11.707559][ T1] Call Trace:
[ 11.708332][ T1] ? __this_cpu_preempt_check+0x8/0x40
[ 11.709541][ T1] ? lockdep_hardirqs_on+0x8f/0x140
[ 11.710693][ T1] ? entry_INT80_32+0x107/0x107
[ 11.711786][ T1] ? irqentry_exit+0x2f/0x80
[ 11.712837][ T1] ? exc_page_fault+0x7c/0xc0
[ 11.713896][ T1] entry_INT80_32+0x107/0x107
[ 11.714947][ T1] EIP: 0x77e6f68a
[ 11.715798][ T1] Code: 33 04 00 83 c4 10 85 ed 0f 85 ea 00 00 00 31 d2 b8 78 00 00 00 65 8b 3d 08 00 00 00 bb 11 00 20 01 83 c7 68 89 d1 89 d6 cd 80 <89> c7 3d 00 f0 ff ff 0f 87 71 01 00 00 85 ff 0f 85 99 00 00 00 8b
[ 11.720097][ T1] EAX: 0000004e EBX: 01200011 ECX: 00000000 EDX: 00000000
[ 11.721656][ T1] ESI: 00000000 EDI: 77dbeda8 EBP: 00000000 ESP: 7ff1f900
[ 11.723218][ T1] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b EFLAGS: 00000202
[ 11.724944][ T1] Modules linked in:
[ 11.725828][ T1] CR2: 0000000000000004
[ 11.726767][ T1] ---[ end trace 0000000000000000 ]---
[ 11.728079][ T1] EIP: do_int80_syscall_32+0x1b6/0x340
[ 11.730139][ T1] Code: 5b 5d 31 c0 31 c9 31 d2 c3 e8 a6 3e 00 00 8b 46 0c 8b 08 f7 c1 1e 30 02 00 74 96 89 4e 08 a1 04 80 b6 87 85 c0 74 27 8b 45 00 <8b> 58 04 8b 4e 04 89 da e8 bd c0 8f fe 8b 46 04 89 da 8b 5e 04 e8
[ 11.750135][ T1] EAX: 00000000 EBX: 85200bcb ECX: 00000010 EDX: 00000000
[ 11.752854][ T1] ESI: 81705f70 EDI: 81705fb4 EBP: 81705fac ESP: 81705f30
[ 11.755587][ T1] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068 EFLAGS: 00010002
[ 11.758498][ T1] CR0: 80050033 CR2: 00000004 CR3: 6c8c8000 CR4: 000406d0
[ 11.761268][ T1] Kernel panic - not syncing: Fatal exception
[ 11.763564][ T1] Kernel Offset: disabled
[ 11.765213][ T1] Rebooting in 30 seconds..

The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20261026/202610261034.27b7d516-lkp@xxxxxxxxx

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0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki