watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor:4781] Modules linked in: irq event stamp: 6905004 hardirqs last enabled at (6905003): [] asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 hardirqs last disabled at (6905004): [] sysvec_apic_timer_interrupt+0xb/0xa0 arch/x86/kernel/apic/apic.c:1094 softirqs last enabled at (3666906): [] asm_call_irq_on_stack+0x12/0x20 softirqs last disabled at (3666747): [] asm_call_irq_on_stack+0x12/0x20 CPU: 0 PID: 4781 Comm: syz-executor Not tainted 5.10.191 #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: 3a 00 0f 1f 00 55 48 89 fd 48 83 c7 18 53 48 89 f3 48 8b 74 24 10 e8 8a c8 41 fd 48 89 ef e8 52 82 42 fd f6 c7 02 75 10 53 9d <65> ff 0d c4 1f 1d 7c 5b 5d e9 9d f0 3a 00 e8 48 81 61 fd eb e9 66 RSP: 0018:ffff88801ad9fc48 EFLAGS: 00000283 RAX: 0000000000695c5f RBX: 0000000000000283 RCX: 1ffffffff0d0fe6a RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff83e54f88 RBP: ffff888014d50870 R08: 0000000000000001 R09: ffffffff8685f737 R10: fffffbfff0d0bee6 R11: 0000000000000001 R12: dffffc0000000000 R13: ffff88800fd999a8 R14: ffff88800fd99b58 R15: ffffffff844e43a0 FS: 0000555556f3e400(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa6f706e020 CR3: 0000000046100000 CR4: 0000000000350ef0 Call Trace: kmemleak_scan+0x1b7/0x1270 mm/kmemleak.c:1435 kmemleak_write+0x576/0x680 mm/kmemleak.c:1826 full_proxy_write+0x11d/0x190 fs/debugfs/file.c:236 vfs_write+0x29a/0xa70 fs/read_write.c:603 ksys_write+0x12d/0x260 fs/read_write.c:658 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x67/0xcc RIP: 0033:0x7fa6f6f735c3 Code: 16 00 00 00 eb ae 90 b8 6e 00 00 00 eb a6 e8 44 ef 04 00 0f 1f 40 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 55 c3 0f 1f 40 00 48 83 ec 28 48 89 54 24 18 RSP: 002b:00007fffbd74ec58 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fffbd74f298 RCX: 00007fa6f6f735c3 RDX: 0000000000000004 RSI: 00007fa6f7029ed9 RDI: 0000000000000003 RBP: 0000000000000002 R08: 0000000000000190 R09: 00007fffbd761080 R10: 00007fffbd761090 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffbd74ed30 R14: 0000000000000000 R15: 0000000000000003 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline] NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline] NMI backtrace for cpu 1 skipped: idling at default_idle+0xe/0x20 arch/x86/kernel/process.c:706 ---------------- Code disassembly (best guess): 0: 3a 00 cmp (%rax),%al 2: 0f 1f 00 nopl (%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 c8 41 fd callq 0xfd41c8a5 1b: 48 89 ef mov %rbp,%rdi 1e: e8 52 82 42 fd callq 0xfd428275 23: f6 c7 02 test $0x2,%bh 26: 75 10 jne 0x38 28: 53 push %rbx 29: 9d popfq * 2a: 65 ff 0d c4 1f 1d 7c decl %gs:0x7c1d1fc4(%rip) # 0x7c1d1ff5 <-- trapping instruction 31: 5b pop %rbx 32: 5d pop %rbp 33: e9 9d f0 3a 00 jmpq 0x3af0d5 38: e8 48 81 61 fd callq 0xfd618185 3d: eb e9 jmp 0x28 3f: 66 data16