audit: type=1326 audit(1642876645.025:94): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=11627 comm="syz-executor.0" exe="/syz-executor.0" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7f6855c9db19 code=0x0 EXT4-fs (loop3): VFS: Can't find ext4 filesystem watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor:11724] Modules linked in: irq event stamp: 12961156 hardirqs last enabled at (12961155): [] asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 hardirqs last disabled at (12961156): [] sysvec_apic_timer_interrupt+0xb/0xa0 arch/x86/kernel/apic/apic.c:1095 softirqs last enabled at (7534490): [] asm_call_irq_on_stack+0x12/0x20 softirqs last disabled at (7534089): [] asm_call_irq_on_stack+0x12/0x20 CPU: 0 PID: 11724 Comm: syz-executor Not tainted 5.10.90 #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 7a 40 48 fd 48 89 ef e8 62 f7 48 fd f6 c7 02 75 0c 53 9d <65> ff 0d 84 0a 24 7c 5b 5d c3 e8 bc 75 67 fd eb ed 66 2e 0f 1f 84 RSP: 0018:ffff888045c7fc48 EFLAGS: 00000283 RAX: 0000000000c5c507 RBX: 0000000000000283 RCX: 1ffffffff0cae5c2 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff83de64c4 RBP: ffff888042a80f30 R08: 0000000000000001 R09: ffffffff86553677 R10: fffffbfff0caa6ce R11: 0000000000000001 R12: dffffc0000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffff8880460e2ad4 FS: 0000555555c1d400(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055ee0897bff8 CR3: 000000004467e000 CR4: 0000000000350ef0 Call Trace: kmemleak_scan+0x9f2/0x1120 mm/kmemleak.c:1534 kmemleak_write+0x558/0x660 mm/kmemleak.c:1820 full_proxy_write+0x11d/0x190 fs/debugfs/file.c:236 vfs_write+0x29a/0xa20 fs/read_write.c:603 ksys_write+0x12d/0x250 fs/read_write.c:658 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f56957045c3 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:00007ffc21d40948 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ffc21d40f88 RCX: 00007f56957045c3 RDX: 0000000000000004 RSI: 00007f56957baed9 RDI: 0000000000000003 RBP: 0000000000000006 R08: 0000000000000000 R09: 00007ffc21de6090 R10: 000000000041945a R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc21d40a20 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/0x10 arch/x86/kernel/process.c:689 kmemleak: 5 new suspected memory leaks (see /sys/kernel/debug/kmemleak) ---------------- 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 7a 40 48 fd callq 0xfd484095 1b: 48 89 ef mov %rbp,%rdi 1e: e8 62 f7 48 fd callq 0xfd48f785 23: f6 c7 02 test $0x2,%bh 26: 75 0c jne 0x34 28: 53 push %rbx 29: 9d popfq * 2a: 65 ff 0d 84 0a 24 7c decl %gs:0x7c240a84(%rip) # 0x7c240ab5 <-- trapping instruction 31: 5b pop %rbx 32: 5d pop %rbp 33: c3 retq 34: e8 bc 75 67 fd callq 0xfd6775f5 39: eb ed jmp 0x28 3b: 66 data16 3c: 2e cs 3d: 0f .byte 0xf 3e: 1f (bad) 3f: 84 .byte 0x84