watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor0:4599] Modules linked in: irq event stamp: 16237302 hardirqs last enabled at (16237301): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (16237301): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (16237301): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (16237301): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (16237301): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (16237302): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (10112516): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (10112389): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (10112389): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4599 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:seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] RIP: 0010:read_seqcount_begin include/linux/seqlock.h:164 [inline] RIP: 0010:read_seqbegin include/linux/seqlock.h:433 [inline] RIP: 0010:read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] RIP: 0010:d_walk+0x840/0xc80 fs/dcache.c:1248 RSP: 0018:ffff88019da1f9f8 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff8801b2216200 RBX: 0000000000000293 RCX: 1ffff10036442d55 RDX: 0000000000000000 RSI: ffffffff81c6995b RDI: 0000000000000293 RBP: ffff88019da1fb78 R08: ffff8801b2216a38 R09: 0000000000000006 R10: ffff8801b2216200 R11: 0000000000000000 R12: 0000000000000200 R13: dffffc0000000000 R14: 1ffff10033b43f82 R15: ffff88019da1fb50 FS: 0000000000e4f940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fce75f8b330 CR3: 000000019da01000 CR4: 00000000001406f0 DR0: 00000000200001c0 DR1: 00000000200001c0 DR2: 00000000200001c0 DR3: 00000000200001c0 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: 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:00007ffdf64d7b78 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffdf64d9920 RDI: 00007ffdf64d9920 RBP: 00007ffdf64d9920 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000000e50940 R13: 0000000000000000 R14: 00000000000009d4 R15: 00000000000778e9 Code: 88 48 89 f8 48 c1 e8 03 42 80 3c 28 00 0f 85 1e 04 00 00 48 83 3d 18 f2 0a 07 00 0f 84 29 02 00 00 e8 35 94 b2 ff 48 89 df 57 9d <0f> 1f 44 00 00 e8 26 94 b2 ff 49 8d 5f 80 48 c1 eb 03 4c 01 eb Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4598 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:__lock_release kernel/locking/lockdep.c:3698 [inline] RIP: 0010:lock_release+0x2e5/0xa10 kernel/locking/lockdep.c:3939 RSP: 0018:ffff88019dc7f8a0 EFLAGS: 00000046 RAX: ffff8801ae9e6b58 RBX: 1ffff10033b8ff19 RCX: ffff8801ae9e6b7a RDX: dffffc0000000000 RSI: ffff8801944b4278 RDI: ffff8801ae9e6b7a RBP: ffff88019dc7f9d0 R08: ffff8801944b4278 R09: ffff88019dc7f728 R10: ffffffff8a713a20 R11: 0000000000000005 R12: ffff88019dc7f9a8 R13: ffff8801944b4278 R14: ffff8801ae9e6280 R15: ffff88019dc7f8e8 FS: 0000000002219940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000002222978 CR3: 000000019dc19000 CR4: 00000000001406e0 DR0: 00000000200001c0 DR1: 0000000020000080 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:00007ffce03b3158 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffce03b4f00 RDI: 00007ffce03b4f00 RBP: 00007ffce03b4f00 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 000000000221a940 R13: 0000000000000000 R14: 0000000000000a8e R15: 000000000007783c Code: 83 c2 03 38 ca 7c 08 84 c9 0f 85 da 05 00 00 8b 48 24 85 c9 0f 85 b1 04 00 00 48 ba 00 00 00 00 00 fc ff df 48 8d 78 22 48 89 f9 <48> c1 e9 03 0f b6 0c 11 48 89 fa 83 e2 07 83 c2 01 38 ca 7c 08