watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.4:6339] Modules linked in: irq event stamp: 96061124 hardirqs last enabled at (96061123): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (96061123): [] _raw_spin_unlock_irqrestore+0x38/0x40 kernel/locking/spinlock.c:191 hardirqs last disabled at (96061124): [] sysvec_apic_timer_interrupt+0xb/0xa0 arch/x86/kernel/apic/apic.c:1095 softirqs last enabled at (95857056): [] asm_call_irq_on_stack+0x12/0x20 softirqs last disabled at (95857051): [] asm_call_irq_on_stack+0x12/0x20 CPU: 0 PID: 6339 Comm: syz-executor.4 Not tainted 5.10.155 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 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: 3e 00 0f 1f 00 55 48 89 fd 48 83 c7 18 53 48 89 f3 48 8b 74 24 10 e8 5a f4 44 fd 48 89 ef e8 32 ae 45 fd f6 c7 02 75 10 53 9d <65> ff 0d 44 6f 20 7c 5b 5d e9 fd 3f 3e 00 e8 a8 79 64 fd eb e9 66 RSP: 0018:ffff88804707fd00 EFLAGS: 00000202 RAX: 0000000005b9c6c3 RBX: 0000000000000202 RCX: 1ffffffff0acdb19 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff83e20008 RBP: ffff88800c993450 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800c993450 R13: 1ffff11008e0ffa5 R14: 0000000000000202 R15: ffff88804707fea8 FS: 00007f517b466700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f517e004018 CR3: 00000000475b2000 CR4: 0000000000350ef0 Call Trace: spin_unlock_irqrestore include/linux/spinlock.h:409 [inline] prepare_to_wait_exclusive+0x129/0x2a0 kernel/sched/wait.c:273 io_cqring_wait fs/io_uring.c:7042 [inline] __do_sys_io_uring_enter+0x825/0x1920 fs/io_uring.c:9131 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RIP: 0033:0x7f517def0b19 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:00007f517b466188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 00007f517e003f60 RCX: 00007f517def0b19 RDX: 0000000000004220 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f517df4af6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffefd83535f R14: 00007f517b466300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 6345 Comm: syz-executor.4 Not tainted 5.10.155 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:__lock_acquire+0xe45/0x5b00 kernel/locking/lockdep.c:4981 Code: 48 03 44 24 30 48 c7 00 00 00 00 00 c7 40 08 00 00 00 00 48 8b 84 24 00 01 00 00 65 48 2b 04 25 28 00 00 00 0f 85 7c 2e 00 00 <48> 81 c4 08 01 00 00 44 89 f8 5b 5d 41 5c 41 5d 41 5e 41 5f e9 12 RSP: 0018:ffff888046a77ab0 EFLAGS: 00000046 RAX: 0000000000000000 RBX: f99361763158d4ef RCX: 00000000000036ef RDX: 1ffff11008e70aa5 RSI: 0000000000000008 RDI: 0000000000000001 RBP: ffffffff86768d38 R08: 0000000000000000 R09: ffffffff8679974f R10: fffffbfff0cf32e9 R11: 0000000000000001 R12: ffff888047384c80 R13: ffff888047385530 R14: dffffc0000000000 R15: 0000000000000001 FS: 00007f517b445700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5daaa40546 CR3: 00000000475b2000 CR4: 0000000000350ee0 Call Trace: lock_acquire kernel/locking/lockdep.c:5565 [inline] lock_acquire+0x197/0x490 kernel/locking/lockdep.c:5530 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x36/0x60 kernel/locking/spinlock.c:159 prepare_to_wait_exclusive+0x7d/0x2a0 kernel/sched/wait.c:267 io_cqring_wait fs/io_uring.c:7042 [inline] __do_sys_io_uring_enter+0x825/0x1920 fs/io_uring.c:9131 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RIP: 0033:0x7f517def0b19 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:00007f517b445188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 00007f517e004020 RCX: 00007f517def0b19 RDX: 0000000000004220 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f517df4af6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffefd83535f R14: 00007f517b445300 R15: 0000000000022000 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 0f 1f 00 nopl (%rax) 3: 55 push %rbp 4: 48 89 fd mov %rdi,%rbp 7: 48 83 c7 18 add $0x18,%rdi b: 53 push %rbx c: 48 89 f3 mov %rsi,%rbx f: 48 8b 74 24 10 mov 0x10(%rsp),%rsi 14: e8 5a f4 44 fd callq 0xfd44f473 19: 48 89 ef mov %rbp,%rdi 1c: e8 32 ae 45 fd callq 0xfd45ae53 21: f6 c7 02 test $0x2,%bh 24: 75 10 jne 0x36 26: 53 push %rbx 27: 9d popfq * 28: 65 ff 0d 44 6f 20 7c decl %gs:0x7c206f44(%rip) # 0x7c206f73 <-- trapping instruction 2f: 5b pop %rbx 30: 5d pop %rbp 31: e9 fd 3f 3e 00 jmpq 0x3e4033 36: e8 a8 79 64 fd callq 0xfd6479e3 3b: eb e9 jmp 0x26 3d: 66 data16