watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [syz-executor.2:6200] Modules linked in: irq event stamp: 78467472 hardirqs last enabled at (78467471): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (78467471): [] _raw_spin_unlock_irqrestore+0x34/0x40 kernel/locking/spinlock.c:191 hardirqs last disabled at (78467472): [] sysvec_apic_timer_interrupt+0xb/0xa0 arch/x86/kernel/apic/apic.c:1095 softirqs last enabled at (10786): [] asm_call_irq_on_stack+0x12/0x20 softirqs last disabled at (10729): [] asm_call_irq_on_stack+0x12/0x20 CPU: 1 PID: 6200 Comm: syz-executor.2 Not tainted 5.10.96 #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 0a fd 47 fd 48 89 ef e8 f2 b3 48 fd f6 c7 02 75 0c 53 9d <65> ff 0d 74 c4 23 7c 5b 5d c3 e8 1c 37 67 fd eb ed 66 2e 0f 1f 84 RSP: 0018:ffff88804a27fd00 EFLAGS: 00000202 RAX: 0000000004ad518f RBX: 0000000000000202 RCX: 1ffffffff0a8dfd9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff83deaad4 RBP: ffff888048644450 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: ffff888048644450 R13: 1ffff1100944ffa5 R14: 0000000000000202 R15: ffff88804a27fea8 FS: 00007ff67e604700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2ce22000 CR3: 000000004cbe0000 CR4: 0000000000350ee0 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: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: 0033:0x7ff68108eb19 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:00007ff67e604188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 00007ff6811a1f60 RCX: 00007ff68108eb19 RDX: 00000000fffffffb RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007ff6810e8f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffffcea3b9f R14: 00007ff67e604300 R15: 0000000000022000 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 6223 Comm: syz-executor.2 Not tainted 5.10.96 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:49 [inline] RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:89 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:121 [inline] RIP: 0010:__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] RIP: 0010:_raw_spin_lock_irqsave+0x9/0x50 kernel/locking/spinlock.c:159 Code: c9 41 b8 01 00 00 00 31 d2 31 f6 e8 e1 05 48 fd 48 89 ef 58 5d e9 37 b2 48 fd e8 f2 37 67 fd eb cc 41 54 55 48 89 fd 9c 41 5c 41 f7 c4 00 02 00 00 75 33 65 ff 05 86 c6 23 7c ff 74 24 10 48 RSP: 0018:ffff888038887d00 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffff888038887e90 RCX: ffffc900009e4000 RDX: 1ffff11007110fd2 RSI: ffff888038887e90 RDI: ffff8880454f0450 RBP: ffff8880454f0450 R08: 0000000000000000 R09: ffff8880454f035f R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000202 R13: 1ffff11007110fa5 R14: ffff8880454f0450 R15: ffff888038887ea8 FS: 00007ff67e5e3700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff67e5c2718 CR3: 000000004cbe0000 CR4: 0000000000350ef0 Call Trace: prepare_to_wait_exclusive+0x7d/0x2a0 kernel/sched/wait.c:267 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: 0033:0x7ff68108eb19 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:00007ff67e5e3188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 00007ff6811a2020 RCX: 00007ff68108eb19 RDX: 00000000fffffffb RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007ff6810e8f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffffcea3b9f R14: 00007ff67e5e3300 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 0a fd 47 fd callq 0xfd47fd25 1b: 48 89 ef mov %rbp,%rdi 1e: e8 f2 b3 48 fd callq 0xfd48b415 23: f6 c7 02 test $0x2,%bh 26: 75 0c jne 0x34 28: 53 push %rbx 29: 9d popfq * 2a: 65 ff 0d 74 c4 23 7c decl %gs:0x7c23c474(%rip) # 0x7c23c4a5 <-- trapping instruction 31: 5b pop %rbx 32: 5d pop %rbp 33: c3 retq 34: e8 1c 37 67 fd callq 0xfd673755 39: eb ed jmp 0x28 3b: 66 data16 3c: 2e cs 3d: 0f .byte 0xf 3e: 1f (bad) 3f: 84 .byte 0x84