watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.7:8325] Modules linked in: irq event stamp: 69502356 hardirqs last enabled at (69502355): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (69502355): [] _raw_spin_unlock_irqrestore+0x34/0x40 kernel/locking/spinlock.c:191 hardirqs last disabled at (69502356): [] sysvec_apic_timer_interrupt+0xb/0xa0 arch/x86/kernel/apic/apic.c:1095 softirqs last enabled at (59228): [] asm_call_irq_on_stack+0x12/0x20 softirqs last disabled at (59203): [] asm_call_irq_on_stack+0x12/0x20 CPU: 0 PID: 8325 Comm: syz-executor.7 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:ffff88804c037d88 EFLAGS: 00000206 RAX: 0000000004248593 RBX: 0000000000000206 RCX: 1ffffffff0a8dd29 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff83ddef94 RBP: ffff888047636450 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001 R13: ffff888047636000 R14: ffff888047636450 R15: ffff888047636000 FS: 00007f6fd9bc3700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555557290098 CR3: 000000003ea9a000 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: 0033:0x7f6fdc6b0b19 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:00007f6fd9bc3188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 00007f6fdc7c41a0 RCX: 00007f6fdc6b0b19 RDX: 0000000000001083 RSI: 0000000000000df3 RDI: 0000000000000003 RBP: 00007f6fdc70af6d R08: 0000000020000180 R09: 0000000000000008 R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd3cf604df R14: 00007f6fd9bc3300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8319 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:__sanitizer_cov_trace_pc+0x45/0x60 kernel/kcov.c:202 Code: f6 c4 01 74 35 8b 82 64 13 00 00 85 c0 74 2b 8b 82 40 13 00 00 83 f8 02 75 20 48 8b 8a 48 13 00 00 8b 92 44 13 00 00 48 8b 01 <48> 83 c0 01 48 39 c2 76 07 48 89 34 c1 48 89 01 c3 66 2e 0f 1f 84 RSP: 0018:ffff888047a17d80 EFLAGS: 00000246 RAX: 000000000003ffff RBX: ffff88803f1db280 RCX: ffffc900019ec000 RDX: 0000000000040000 RSI: ffffffff8183d851 RDI: ffffffff83ddef94 RBP: ffff88800dcf2280 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001 R13: ffff88801ab1f000 R14: ffff88801ab1f450 R15: ffff88801ab1f000 FS: 00007ff651832700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2d024000 CR3: 000000004330c000 CR4: 0000000000350ee0 Call Trace: get_current arch/x86/include/asm/current.h:15 [inline] io_run_task_work fs/io_uring.c:2322 [inline] io_run_task_work_sig+0x11/0x2e0 fs/io_uring.c:6993 io_cqring_wait fs/io_uring.c:7054 [inline] __do_sys_io_uring_enter+0x826/0x1900 fs/io_uring.c:9132 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7ff6542ddb19 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:00007ff651832188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 00007ff6543f1020 RCX: 00007ff6542ddb19 RDX: 0000000000001083 RSI: 0000000000000df3 RDI: 0000000000000003 RBP: 00007ff654337f6d R08: 0000000020000180 R09: 0000000000000008 R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcddffc6ef R14: 00007ff651832300 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