overlayfs: missing 'lowerdir' watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [syz-executor4:4563] Modules linked in: irq event stamp: 12462428 hardirqs last enabled at (12462427): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (12462427): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (12462427): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (12462427): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (12462427): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (12462428): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (918502): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (918395): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (918395): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 1 PID: 4563 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: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:ffff8801a12478a0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 1ffff10034248f19 RCX: 1ffff10036688db5 RDX: 1ffffffff11a316d RSI: 0000000000000005 RDI: 0000000000000286 RBP: ffff8801a12479d0 R08: 1ffff10034248f1d R09: ffffed0039cfdb9c R10: 0000000000000003 R11: 0000000000000004 R12: ffff8801b3446580 R13: ffff8801ce7edcf8 R14: ffff8801b3446580 R15: ffff8801a12478e8 FS: 00000000014a5940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffca5679e90 CR3: 00000001a1215000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 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:00007ffe64871ef8 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffe64873ca0 RDI: 00007ffe64873ca0 RBP: 00007ffe64873ca0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 00000000014a6940 R13: 0000000000000000 R14: 0000000000000245 R15: 000000000001e600 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4560 Comm: syz-executor2 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:ffff8801a230f8d8 EFLAGS: 00000286 RAX: dffffc0000000000 RBX: 1ffff10034461f20 RCX: 0000000000000000 RDX: 1ffffffff11a316d RSI: ffff8801a2304fb8 RDI: 0000000000000286 RBP: ffff8801a230f9c8 R08: 0000000000006014 R09: 0000000000000003 R10: ffff8801a2305030 R11: ffff8801a2304780 R12: ffff8801a2304780 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000001668940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001671978 CR3: 00000001a22cb000 CR4: 00000000001406f0 DR0: 00000000200001c0 DR1: 00000000200001c0 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:310 [inline] d_walk+0x261/0xc80 fs/dcache.c:1250 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:00007ffc346aba18 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffc346ad7c0 RDI: 00007ffc346ad7c0 RBP: 00007ffc346ad7c0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000001669940 R13: 0000000000000000 R14: 000000000000024c R15: 000000000001e60a 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