watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor0:4552] Modules linked in: irq event stamp: 33670862 hardirqs last enabled at (33670861): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (33670861): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (33670861): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (33670861): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (33670861): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (33670862): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (33670472): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (33670465): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (33670465): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4552 Comm: syz-executor0 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_acquire+0x257/0x520 kernel/locking/lockdep.c:3923 RSP: 0018:ffff8801af1078d8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 1ffff10035e20f20 RCX: 0000000000000000 RDX: 1ffffffff11a316d RSI: ffff8801af132938 RDI: 0000000000000286 RBP: ffff8801af1079c8 R08: 0000000000002581 R09: 0000000000000004 R10: ffff8801af1329d8 R11: ffff8801af132100 R12: ffff8801af132100 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000001cd9940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001ce2978 CR3: 00000001ad12a000 CR4: 00000000001406f0 DR0: 00000000200001c0 DR1: 00000000200001c0 DR2: 0000000020000000 DR3: 00000000200001c0 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: _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:00007ffd4f8b4128 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffd4f8b5ed0 RDI: 00007ffd4f8b5ed0 RBP: 00007ffd4f8b5ed0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000001cda940 R13: 0000000000000000 R14: 0000000000002a40 R15: 0000000000195444 Code: 00 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 5e 02 00 00 48 83 3d e0 7c 74 07 00 0f 84 c8 01 00 00 48 8b bd 20 ff 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: 4557 Comm: syz-executor5 Not tainted 4.17.0-rc4+ #14 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__read_once_size include/linux/compiler.h:188 [inline] RIP: 0010:list_empty include/linux/list.h:203 [inline] RIP: 0010:shrink_dentry_list+0xc8/0x7c0 fs/dcache.c:1052 RSP: 0018:ffff8801a01d7ab0 EFLAGS: 00000246 RAX: ffffed003403af62 RBX: ffff8801a01d7c18 RCX: ffffffff81c6a0d9 RDX: 0000000000000000 RSI: ffffffff81c65af3 RDI: ffff8801a01d7c18 RBP: ffff8801a01d7b78 R08: ffff8801a01cc2c0 R09: ffffed00327fddd0 R10: ffffed00327fddd0 R11: ffff880193feee83 R12: ffff8801a01d7c50 R13: dffffc0000000000 R14: 1ffff1003403af82 R15: ffffed003403af85 FS: 0000000000b2b940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000142be80 CR3: 00000001a01bf000 CR4: 00000000001406e0 DR0: 0000000020000000 DR1: 0000000020000080 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: shrink_dcache_parent+0xba/0x230 fs/dcache.c:1490 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:00007ffe1c85f248 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffe1c860ff0 RDI: 00007ffe1c860ff0 RBP: 00007ffe1c860ff0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000000b2c940 R13: 0000000000000000 R14: 0000000000003510 R15: 00000000001954c3 Code: 0f 85 6f 06 00 00 48 8b 85 70 ff ff ff 48 8b 18 48 8b 85 68 ff ff ff 80 38 00 0f 85 70 06 00 00 48 8b 85 68 ff ff ff 48 89 5d 98 00 f8 48 39 9d 70 ff ff ff 0f 84 cb 04 00 00 e8 43 d2 b2 ff