watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.2:6524] Modules linked in: irq event stamp: 96358622 hardirqs last enabled at (96358621): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (96358621): [] _raw_spin_unlock_irqrestore+0x34/0x40 kernel/locking/spinlock.c:191 hardirqs last disabled at (96358622): [] sysvec_apic_timer_interrupt+0xb/0xa0 arch/x86/kernel/apic/apic.c:1095 softirqs last enabled at (201092): [] asm_call_irq_on_stack+0x12/0x20 softirqs last disabled at (201063): [] asm_call_irq_on_stack+0x12/0x20 CPU: 0 PID: 6524 Comm: syz-executor.2 Not tainted 5.10.79 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 RIP: 0010:__preempt_count_sub arch/x86/include/asm/preempt.h:84 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x25/0x40 kernel/locking/spinlock.c:191 Code: 80 00 00 00 00 55 48 89 fd 48 83 c7 18 53 48 89 f3 48 8b 74 24 10 e8 8a b4 48 fd 48 89 ef e8 72 6b 49 fd f6 c7 02 75 0c 53 9d <65> ff 0d b4 ff 23 7c 5b 5d c3 e8 1c e5 67 fd eb ed 66 2e 0f 1f 84 RSP: 0018:ffff8880435efd88 EFLAGS: 00000206 RAX: 0000000005be50dd RBX: 0000000000000206 RCX: 1ffffffff0a8dd29 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff83ddef94 RBP: ffff888041e79450 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001 R13: ffff888041e79000 R14: ffff888041e79450 R15: ffff888041e79000 FS: 00007f913edfa700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005576561b1990 CR3: 000000000ec1e000 CR4: 0000000000350ef0 Call Trace: io_cqring_wait fs/io_uring.c:7064 [inline] __do_sys_io_uring_enter+0xded/0x1900 fs/io_uring.c:9132 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f9141884b19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f913edfa188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 00007f9141997f60 RCX: 00007f9141884b19 RDX: 0000000000000004 RSI: 00000000000001e2 RDI: 0000000000000003 RBP: 00007f91418def6d R08: 0000000020000040 R09: 0000000000000008 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc06e116cf R14: 00007f913edfa300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 6535 Comm: syz-executor.3 Not tainted 5.10.79 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 RIP: 0010:trace_lock_release include/trace/events/lock.h:58 [inline] RIP: 0010:lock_release+0x437/0x6b0 kernel/locking/lockdep.c:5573 Code: 06 48 8d 3c c5 08 1d 47 85 e8 85 0b 44 00 48 0f a3 1d e5 74 20 04 0f 83 7d fc ff ff 65 ff 05 10 47 db 7e 48 8b 1d c9 57 1e 04 <48> 85 db 74 30 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 08 48 89 fa RSP: 0018:ffff888043d6fc38 EFLAGS: 00000003 RAX: 0000000000000001 RBX: ffff888042a74810 RCX: ffffffff8126a81b RDX: fffffbfff0a8e3a2 RSI: 0000000000000008 RDI: ffffffff85471d08 RBP: 1ffff110087adf89 R08: 0000000000000000 R09: ffffffff85471d0f R10: fffffbfff0a8e3a1 R11: 0000000000000001 R12: ffff888042998468 R13: 1ffff110087adfa5 R14: 0000000000000202 R15: ffff888043d6fea8 FS: 00007f4d9155f700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f91419b0000 CR3: 0000000043598000 CR4: 0000000000350ee0 Call Trace: __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:158 [inline] _raw_spin_unlock_irqrestore+0x16/0x40 kernel/locking/spinlock.c:191 spin_unlock_irqrestore include/linux/spinlock.h:409 [inline] prepare_to_wait_exclusive+0x129/0x2a0 kernel/sched/wait.c:266 io_cqring_wait fs/io_uring.c:7051 [inline] __do_sys_io_uring_enter+0x821/0x1900 fs/io_uring.c:9132 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f4d93fe9b19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4d9155f188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 00007f4d940fcf60 RCX: 00007f4d93fe9b19 RDX: 0000000000000004 RSI: 00000000000001e2 RDI: 0000000000000003 RBP: 00007f4d94043f6d R08: 0000000020000040 R09: 0000000000000008 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd3160721f R14: 00007f4d9155f300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 80 00 00 addb $0x0,(%rax) 3: 00 00 add %al,(%rax) 5: 55 push %rbp 6: 48 89 fd mov %rdi,%rbp 9: 48 83 c7 18 add $0x18,%rdi d: 53 push %rbx e: 48 89 f3 mov %rsi,%rbx 11: 48 8b 74 24 10 mov 0x10(%rsp),%rsi 16: e8 8a b4 48 fd callq 0xfd48b4a5 1b: 48 89 ef mov %rbp,%rdi 1e: e8 72 6b 49 fd callq 0xfd496b95 23: f6 c7 02 test $0x2,%bh 26: 75 0c jne 0x34 28: 53 push %rbx 29: 9d popfq * 2a: 65 ff 0d b4 ff 23 7c decl %gs:0x7c23ffb4(%rip) # 0x7c23ffe5 <-- trapping instruction 31: 5b pop %rbx 32: 5d pop %rbp 33: c3 retq 34: e8 1c e5 67 fd callq 0xfd67e555 39: eb ed jmp 0x28 3b: 66 data16 3c: 2e cs 3d: 0f .byte 0xf 3e: 1f (bad) 3f: 84 .byte 0x84