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https://lore.kernel.org/oe-lkp/202510211205.1e0f5223-lkp@intel.com [ 23.486344][ T3682] BUG: kernel NULL pointer dereference, address: 0000000000000051 [ 23.486846][ T3682] #PF: supervisor read access in kernel mode [ 23.487189][ T3682] #PF: error_code(0x0000) - not-present page [ 23.487532][ T3682] PGD 12b0a5067 P4D 12b0a5067 PUD 12b0b0067 PMD 0 [ 23.487905][ T3682] Oops: Oops: 0000 [#1] [ 23.488147][ T3682] CPU: 0 UID: 65534 PID: 3682 Comm: trinity-c1 Not tainted 6.18.0-rc1-00001-g79104becf42b #1 PREEMPT [ 23.488817][ T3682] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 23.489401][ T3682] RIP: 0010:pick_task_fair (kernel/sched/fair.c:5526 kernel/sched/fair.c:8846) [ 23.490438][ T3682] Code: d2 74 1a 4c 89 d6 4c 89 e7 e8 8d e9 ff ff 85 c0 74 0b 41 80 7a 51 00 74 31 0f 0b eb 2d be 01 00 00 00 4c 89 e7 e8 b5 fe ff ff <80> 78 51 00 49 89 c2 74 12 ba 01 02 00 00 48 89 c6 48 89 df e8 44 All code ======== 0: d2 74 1a 4c shlb %cl,0x4c(%rdx,%rbx,1) 4: 89 d6 mov %edx,%esi 6: 4c 89 e7 mov %r12,%rdi 9: e8 8d e9 ff ff call 0xffffffffffffe99b e: 85 c0 test %eax,%eax 10: 74 0b je 0x1d 12: 41 80 7a 51 00 cmpb $0x0,0x51(%r10) 17: 74 31 je 0x4a 19: 0f 0b ud2 1b: eb 2d jmp 0x4a 1d: be 01 00 00 00 mov $0x1,%esi 22: 4c 89 e7 mov %r12,%rdi 25: e8 b5 fe ff ff call 0xfffffffffffffedf 2a:* 80 78 51 00 cmpb $0x0,0x51(%rax) <-- trapping instruction 2e: 49 89 c2 mov %rax,%r10 31: 74 12 je 0x45 33: ba 01 02 00 00 mov $0x201,%edx 38: 48 89 c6 mov %rax,%rsi 3b: 48 89 df mov %rbx,%rdi 3e: e8 .byte 0xe8 3f: 44 rex.R Code starting with the faulting instruction =========================================== 0: 80 78 51 00 cmpb $0x0,0x51(%rax) 4: 49 89 c2 mov %rax,%r10 7: 74 12 je 0x1b 9: ba 01 02 00 00 mov $0x201,%edx e: 48 89 c6 mov %rax,%rsi 11: 48 89 df mov %rbx,%rdi 14: e8 .byte 0xe8 15: 44 rex.R [ 23.491525][ T3682] RSP: 0000:ffff88812640fdf0 EFLAGS: 00010046 [ 23.491870][ T3682] RAX: 0000000000000000 RBX: ffffffff8306f580 RCX: 000000004d636517 [ 23.492330][ T3682] RDX: 000000004d636517 RSI: 000000005572ffec RDI: ffffffff8306f600 [ 23.492786][ T3682] RBP: ffff88812640fe00 R08: 000000000000000f R09: 0000000000000002 [ 23.493232][ T3682] R10: 0000000000000000 R11: ffff8881264140c0 R12: ffffffff8306f600 [ 23.493679][ T3682] R13: ffff888125cf0000 R14: ffff88812640fe58 R15: ffff888126414788 [ 23.494125][ T3682] FS: 0000000000000000(0000) GS:0000000000000000(0063) knlGS:0000000008e97880 [ 23.494627][ T3682] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 23.494999][ T3682] CR2: 0000000000000051 CR3: 000000012b09c000 CR4: 00000000000406b0 [ 23.495447][ T3682] Call Trace: [ 23.495637][ T3682] [ 23.495807][ T3682] pick_next_task_fair (kernel/sched/fair.c:8869) [ 23.496095][ T3682] __schedule (kernel/sched/core.c:5969 kernel/sched/core.c:6488 kernel/sched/core.c:6870) [ 23.496349][ T3682] ? raw_spin_rq_unlock (kernel/sched/core.c:683) [ 23.496640][ T3682] schedule (arch/x86/include/asm/bitops.h:202 (discriminator 1) arch/x86/include/asm/bitops.h:232 (discriminator 1) include/linux/thread_info.h:192 (discriminator 1) include/linux/thread_info.h:208 (discriminator 1) include/linux/sched.h:2217 (discriminator 1) kernel/sched/core.c:7013 (discriminator 1) kernel/sched/core.c:7026 (discriminator 1)) [ 23.496868][ T3682] do_sched_yield (kernel/sched/syscalls.c:1361) [ 23.497127][ T3682] __do_sys_sched_yield (kernel/sched/syscalls.c:1375) [ 23.497409][ T3682] ia32_sys_call (kbuild/obj/consumer/x86_64-randconfig-121-20251020/./arch/x86/include/generated/asm/syscalls_32.h:159) [ 23.497681][ T3682] do_int80_emulation (arch/x86/entry/syscall_32.c:83 arch/x86/entry/syscall_32.c:172) [ 23.497962][ T3682] asm_int80_emulation (arch/x86/include/asm/idtentry.h:569) [ 23.498244][ T3682] RIP: 0023:0xf7f3c579 [ 23.498477][ T3682] Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 0f 1f 40 00 cd 80 <5d> 5a 59 c3 90 90 90 90 2e 8d b4 26 00 00 00 00 8d b4 26 00 00 00 All code ======== 0: b8 01 10 06 03 mov $0x3061001,%eax 5: 74 b4 je 0xffffffffffffffbb 7: 01 10 add %edx,(%rax) 9: 07 (bad) a: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi e: 10 08 adc %cl,(%rax) 10: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi ... 20: 00 51 52 add %dl,0x52(%rcx) 23: 55 push %rbp 24: 0f 1f 40 00 nopl 0x0(%rax) 28: cd 80 int $0x80 2a:* 5d pop %rbp <-- trapping instruction 2b: 5a pop %rdx 2c: 59 pop %rcx 2d: c3 ret 2e: 90 nop 2f: 90 nop 30: 90 nop 31: 90 nop 32: 2e 8d b4 26 00 00 00 cs lea 0x0(%rsi,%riz,1),%esi 39: 00 3a: 8d .byte 0x8d 3b: b4 26 mov $0x26,%ah 3d: 00 00 add %al,(%rax) ... Code starting with the faulting instruction =========================================== 0: 5d pop %rbp 1: 5a pop %rdx 2: 59 pop %rcx 3: c3 ret 4: 90 nop 5: 90 nop 6: 90 nop 7: 90 nop 8: 2e 8d b4 26 00 00 00 cs lea 0x0(%rsi,%riz,1),%esi f: 00 10: 8d .byte 0x8d 11: b4 26 mov $0x26,%ah 13: 00 00 add %al,(%rax) ... [ 23.499561][ T3682] RSP: 002b:00000000ffd6080c EFLAGS: 00000292 ORIG_RAX: 000000000000009e [ 23.500032][ T3682] RAX: ffffffffffffffda RBX: 00000000edededed RCX: 00000000e16628f4 [ 23.500494][ T3682] RDX: 00000000000000e4 RSI: 00000000c25418ab RDI: 00000000810000d8 [ 23.500940][ T3682] RBP: 0000000000002424 R08: 0000000000000000 R09: 0000000000000000 [ 23.501386][ T3682] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 23.501832][ T3682] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 23.502281][ T3682] [ 23.502457][ T3682] Modules linked in: [ 23.502681][ T3682] CR2: 0000000000000051 [ 23.502918][ T3682] ---[ end trace 0000000000000000 ]--- [ 23.503228][ T3682] RIP: 0010:pick_task_fair (kernel/sched/fair.c:5526 kernel/sched/fair.c:8846) [ 23.503528][ T3682] Code: d2 74 1a 4c 89 d6 4c 89 e7 e8 8d e9 ff ff 85 c0 74 0b 41 80 7a 51 00 74 31 0f 0b eb 2d be 01 00 00 00 4c 89 e7 e8 b5 fe ff ff <80> 78 51 00 49 89 c2 74 12 ba 01 02 00 00 48 89 c6 48 89 df e8 44 All code ======== 0: d2 74 1a 4c shlb %cl,0x4c(%rdx,%rbx,1) 4: 89 d6 mov %edx,%esi 6: 4c 89 e7 mov %r12,%rdi 9: e8 8d e9 ff ff call 0xffffffffffffe99b e: 85 c0 test %eax,%eax 10: 74 0b je 0x1d 12: 41 80 7a 51 00 cmpb $0x0,0x51(%r10) 17: 74 31 je 0x4a 19: 0f 0b ud2 1b: eb 2d jmp 0x4a 1d: be 01 00 00 00 mov $0x1,%esi 22: 4c 89 e7 mov %r12,%rdi 25: e8 b5 fe ff ff call 0xfffffffffffffedf 2a:* 80 78 51 00 cmpb $0x0,0x51(%rax) <-- trapping instruction 2e: 49 89 c2 mov %rax,%r10 31: 74 12 je 0x45 33: ba 01 02 00 00 mov $0x201,%edx 38: 48 89 c6 mov %rax,%rsi 3b: 48 89 df mov %rbx,%rdi 3e: e8 .byte 0xe8 3f: 44 rex.R Code starting with the faulting instruction =========================================== 0: 80 78 51 00 cmpb $0x0,0x51(%rax) 4: 49 89 c2 mov %rax,%r10 7: 74 12 je 0x1b 9: ba 01 02 00 00 mov $0x201,%edx e: 48 89 c6 mov %rax,%rsi 11: 48 89 df mov %rbx,%rdi 14: e8 .byte 0xe8 15: 44 rex.R The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20251021/202510211205.1e0f5223-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki