watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor3:4597] Modules linked in: irq event stamp: 9727886 hardirqs last enabled at (9727885): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (9727885): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (9727885): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (9727885): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (9727885): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (9727886): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (303894): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (303719): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (303719): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4597 Comm: syz-executor3 Not tainted 4.17.0-rc4+ #14 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:783 [inline] RIP: 0010:lock_release+0x4d4/0xa10 kernel/locking/lockdep.c:3942 RSP: 0018:ffff8801a0a5f8a0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 1ffff1003414bf19 RCX: 1ffff1003414a54d RDX: 1ffffffff11a316d RSI: 0000000000000005 RDI: 0000000000000286 RBP: ffff8801a0a5f9d0 R08: 1ffff1003414bf1d R09: ffff8801a0a5f728 R10: 0000000000000003 R11: 0000000000000004 R12: ffff8801a0a52240 R13: ffff8801c993cab8 R14: ffff8801a0a52240 R15: ffff8801a0a5f8e8 FS: 0000000000b83940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000b8c978 CR3: 00000001a0e63000 CR4: 00000000001406f0 DR0: 00000000200001c0 DR1: 00000000200001c0 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __raw_spin_unlock include/linux/spinlock_api_smp.h:150 [inline] _raw_spin_unlock+0x1a/0x30 kernel/locking/spinlock.c:176 spin_unlock include/linux/spinlock.h:350 [inline] d_walk+0x451/0xc80 fs/dcache.c:1298 shrink_dcache_parent+0x179/0x230 fs/dcache.c:1486 vfs_rmdir+0x202/0x470 fs/namei.c:3850 do_rmdir+0x523/0x610 fs/namei.c:3911 __do_sys_rmdir fs/namei.c:3929 [inline] __se_sys_rmdir fs/namei.c:3927 [inline] __x64_sys_rmdir+0x36/0x40 fs/namei.c:3927 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455777 RSP: 002b:00007ffe9895ce78 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffe9895ec20 RDI: 00007ffe9895ec20 RBP: 00007ffe9895ec20 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000000b84940 R13: 0000000000000000 R14: 0000000000000123 R15: 0000000000015250 Code: 00 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 a3 03 00 00 48 83 3d 73 84 74 07 00 0f 84 b8 02 00 00 48 8b bd e8 fe ff ff 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4595 Comm: syz-executor4 Not tainted 4.17.0-rc4+ #14 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:validate_chain kernel/locking/lockdep.c:2424 [inline] RIP: 0010:__lock_acquire+0xa53/0x5140 kernel/locking/lockdep.c:3431 RSP: 0018:ffff8801a4ae7520 EFLAGS: 00000097 RAX: 0000000000000003 RBX: ffffffff89c2d8a8 RCX: 000000000ecdfbab RDX: 0000000000000004 RSI: ffff8801a4aba9f8 RDI: ffffffff89c2d8b8 RBP: ffff8801a4ae78a8 R08: 0000000000006213 R09: 0000000000000004 R10: ffff8801a4abaa98 R11: ffff8801a4aba1c0 R12: 1ffff1003495cecc R13: 0000000000000000 R14: e7fd807038792a6a R15: 0000000000000000 FS: 00000000015ef940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffdfc9d0fd8 CR3: 00000001a4971000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920 _raw_spin_lock_nested+0x28/0x40 kernel/locking/spinlock.c:354 d_walk+0x3ad/0xc80 fs/dcache.c:1274 shrink_dcache_parent+0x179/0x230 fs/dcache.c:1486 vfs_rmdir+0x202/0x470 fs/namei.c:3850 do_rmdir+0x523/0x610 fs/namei.c:3911 __do_sys_rmdir fs/namei.c:3929 [inline] __se_sys_rmdir fs/namei.c:3927 [inline] __x64_sys_rmdir+0x36/0x40 fs/namei.c:3927 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455777 RSP: 002b:00007ffdfc9d1238 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffdfc9d2fe0 RDI: 00007ffdfc9d2fe0 RBP: 00007ffdfc9d2fe0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 00000000015f0940 R13: 0000000000000000 R14: 000000000000012b R15: 000000000001524e Code: 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 14 02 48 c7 c0 a0 b8 09 89 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 ba 31 00 00 <8b> 0d 17 12 ad 07 85 c9 0f 84 62 f7 ff ff 48 b8 00 00 00 00 00