Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] CPU: 0 UID: 0 PID: 7740 Comm: syz.3.490 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:task_cpu include/linux/sched.h:2268 [inline] RIP: 0010:is_task_rq_idle kernel/sched/core.c:6169 [inline] RIP: 0010:cookie_equals kernel/sched/core.c:6174 [inline] RIP: 0010:pick_next_task kernel/sched/core.c:6355 [inline] RIP: 0010:__schedule+0x4030/0x5550 kernel/sched/core.c:7143 Code: 24 80 00 00 00 e8 80 97 f2 f6 48 8b 84 24 80 00 00 00 48 8b 18 4c 8d 7b 14 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 87 04 00 00 45 8b 3f 49 83 ff 08 0f 83 98 RSP: 0018:ffffc9000698f620 EFLAGS: 00010003 RAX: 0000000000000002 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: 0000000000000003 RSI: 0000000000000000 RDI: ffff8880b8620c60 RBP: ffffc9000698f808 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff52000d31e74 R12: ffff8880b863c658 R13: ffff888125a6b000 R14: 1ffff110170c7922 R15: 0000000000000014 FS: 00007fc77cf466c0(0000) GS:ffff888125a6b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fddea5dd368 CR3: 000000005afe4000 CR4: 00000000003526f0 Call Trace: preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7552 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline] irqentry_exit+0x14f/0x8c0 kernel/entry/common.c:167 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:710 RIP: 0010:__local_bh_enable_ip+0x1c2/0x2b0 kernel/softirq.c:307 Code: f7 89 df e8 60 01 00 00 41 f7 c4 00 02 00 00 74 05 e8 d2 c9 45 00 9c 58 a9 00 02 00 00 75 23 41 f7 c4 00 02 00 00 74 01 fb 5b <41> 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 90 0f 0b 90 e9 66 fe RSP: 0018:ffffc9000698f930 EFLAGS: 00000206 RAX: 0000000000000002 RBX: ffff8880319930f8 RCX: 0000000000000046 RDX: 0000000000000006 RSI: ffffffff8d978313 RDI: ffffffff8bcc4d80 RBP: 1ffff1100794a17e R08: ffffffff8fcf38f7 R09: 1ffffffff1f9e71e R10: dffffc0000000000 R11: fffffbfff1f9e71f R12: 0000000000000286 R13: dffffc0000000000 R14: ffff88803ca50bf4 R15: 0000000000000001 local_bh_enable include/linux/bottom_half.h:33 [inline] snd_pcm_group_unlock_irq sound/core/pcm_native.c:104 [inline] snd_pcm_stream_unlock_irq sound/core/pcm_native.c:165 [inline] class_pcm_stream_lock_irq_destructor include/sound/pcm.h:679 [inline] snd_pcm_do_reset+0x2b2/0x300 sound/core/pcm_native.c:1952 snd_pcm_action_single sound/core/pcm_native.c:1342 [inline] snd_pcm_action_nonatomic+0x19b/0x2b0 sound/core/pcm_native.c:1457 snd_pcm_oss_prepare sound/core/oss/pcm_oss.c:1146 [inline] snd_pcm_oss_write3+0xcd/0x300 sound/core/oss/pcm_oss.c:1242 snd_pcm_plug_write_transfer+0x2d1/0x4d0 sound/core/oss/pcm_plugin.c:615 snd_pcm_oss_write2+0x283/0x440 sound/core/oss/pcm_oss.c:1383 snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1449 [inline] snd_pcm_oss_write+0x6d1/0xbe0 sound/core/oss/pcm_oss.c:2811 vfs_write+0x2a3/0xba0 fs/read_write.c:685 ksys_write+0x156/0x270 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc77ecece59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc77cf46028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fc77ef65fa0 RCX: 00007fc77ecece59 RDX: 000000000000fc36 RSI: 0000200000000500 RDI: 0000000000000003 RBP: 00007fc77ed82e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc77ef66038 R14: 00007fc77ef65fa0 R15: 00007fff31e4dd58 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:task_cpu include/linux/sched.h:2268 [inline] RIP: 0010:is_task_rq_idle kernel/sched/core.c:6169 [inline] RIP: 0010:cookie_equals kernel/sched/core.c:6174 [inline] RIP: 0010:pick_next_task kernel/sched/core.c:6355 [inline] RIP: 0010:__schedule+0x4030/0x5550 kernel/sched/core.c:7143 Code: 24 80 00 00 00 e8 80 97 f2 f6 48 8b 84 24 80 00 00 00 48 8b 18 4c 8d 7b 14 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 87 04 00 00 45 8b 3f 49 83 ff 08 0f 83 98 RSP: 0018:ffffc9000698f620 EFLAGS: 00010003 RAX: 0000000000000002 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: 0000000000000003 RSI: 0000000000000000 RDI: ffff8880b8620c60 RBP: ffffc9000698f808 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff52000d31e74 R12: ffff8880b863c658 R13: ffff888125a6b000 R14: 1ffff110170c7922 R15: 0000000000000014 FS: 00007fc77cf466c0(0000) GS:ffff888125a6b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fddea5dd368 CR3: 000000005afe4000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 24 80 and $0x80,%al 2: 00 00 add %al,(%rax) 4: 00 e8 add %ch,%al 6: 80 97 f2 f6 48 8b 84 adcb $0x84,-0x74b7090e(%rdi) d: 24 80 and $0x80,%al f: 00 00 add %al,(%rax) 11: 00 48 8b add %cl,-0x75(%rax) 14: 18 4c 8d 7b sbb %cl,0x7b(%rbp,%rcx,4) 18: 14 4c adc $0x4c,%al 1a: 89 f8 mov %edi,%eax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 0f b6 04 08 movzbl (%rax,%rcx,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 0f 85 87 04 00 00 jne 0x4bd 36: 45 8b 3f mov (%r15),%r15d 39: 49 83 ff 08 cmp $0x8,%r15 3d: 0f .byte 0xf 3e: 83 .byte 0x83 3f: 98 cwtl