watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.0:4476] Modules linked in: irq event stamp: 117700214 hardirqs last enabled at (117700213): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (117700213): [] _raw_spin_unlock_irqrestore+0x34/0x40 kernel/locking/spinlock.c:191 hardirqs last disabled at (117700214): [] sysvec_apic_timer_interrupt+0xb/0xa0 arch/x86/kernel/apic/apic.c:1095 softirqs last enabled at (395526): [] asm_call_irq_on_stack+0x12/0x20 softirqs last disabled at (395401): [] asm_call_irq_on_stack+0x12/0x20 CPU: 0 PID: 4476 Comm: syz-executor.0 Not tainted 5.10.123 #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 9a ff 47 fd 48 89 ef e8 82 b7 48 fd f6 c7 02 75 0c 53 9d <65> ff 0d 84 d9 23 7c 5b 5d c3 e8 dc 4b 67 fd eb ed 66 2e 0f 1f 84 RSP: 0018:ffff888008b1fd88 EFLAGS: 00000287 RAX: 000000000703f675 RBX: 0000000000000287 RCX: 1ffffffff0a8d8b1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff83de95c4 RBP: ffff88801c203450 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001 R13: ffff88801c203000 R14: ffff88801c203450 R15: ffff88801c203000 FS: 00007f9c9a70d700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2d023000 CR3: 0000000044fc8000 CR4: 0000000000350ef0 Call Trace: io_cqring_wait fs/io_uring.c:7039 [inline] __do_sys_io_uring_enter+0xded/0x1900 fs/io_uring.c:9112 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f9c9d197b19 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:00007f9c9a70d188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 00007f9c9d2aaf60 RCX: 00007f9c9d197b19 RDX: 00000000000005ec RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007f9c9d1f1f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc60d1f84f R14: 00007f9c9a70d300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4517 Comm: syz-executor.0 Not tainted 5.10.123 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 RIP: 0010:rcu_read_lock_held_common kernel/rcu/update.c:118 [inline] RIP: 0010:rcu_read_lock_sched_held+0x2/0x70 kernel/rcu/update.c:121 Code: 49 c1 ec 09 49 83 f4 01 41 83 e4 01 44 89 e0 41 5c c3 45 31 e4 44 89 e0 41 5c c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 41 54 <41> bc 01 00 00 00 e8 e3 4b b0 02 85 c0 75 06 44 89 e0 41 5c c3 e8 RSP: 0018:ffff8880458ffc00 EFLAGS: 00000003 RAX: ffff88801b175210 RBX: 1ffff11008b1ff84 RCX: ffffffff81269c9f RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffffff8546f948 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8546f94f R10: fffffbfff0a8df29 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000000 R14: ffff888046ce6468 R15: 0000000000000000 FS: 00007f9c9a6ec700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000044fc8000 CR4: 0000000000350ee0 Call Trace: trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x3f9/0x490 kernel/locking/lockdep.c:5535 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x36/0x50 kernel/locking/spinlock.c:159 prepare_to_wait_exclusive+0x7d/0x2a0 kernel/sched/wait.c:267 io_cqring_wait fs/io_uring.c:7026 [inline] __do_sys_io_uring_enter+0x821/0x1900 fs/io_uring.c:9112 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f9c9d197b19 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:00007f9c9a6ec188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 00007f9c9d2ab020 RCX: 00007f9c9d197b19 RDX: 00000000000005ec RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007f9c9d1f1f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc60d1f84f R14: 00007f9c9a6ec300 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 9a ff 47 fd callq 0xfd47ffb5 1b: 48 89 ef mov %rbp,%rdi 1e: e8 82 b7 48 fd callq 0xfd48b7a5 23: f6 c7 02 test $0x2,%bh 26: 75 0c jne 0x34 28: 53 push %rbx 29: 9d popfq * 2a: 65 ff 0d 84 d9 23 7c decl %gs:0x7c23d984(%rip) # 0x7c23d9b5 <-- trapping instruction 31: 5b pop %rbx 32: 5d pop %rbp 33: c3 retq 34: e8 dc 4b 67 fd callq 0xfd674c15 39: eb ed jmp 0x28 3b: 66 data16 3c: 2e cs 3d: 0f .byte 0xf 3e: 1f (bad) 3f: 84 .byte 0x84