watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor5:4509] Modules linked in: irq event stamp: 15243114 hardirqs last enabled at (15243113): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (15243113): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (15243113): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (15243113): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (15243113): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (15243114): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (2178568): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (2178521): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (2178521): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4509 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:d_walk+0x46a/0xc80 fs/dcache.c:1266 RSP: 0018:ffff8801a0c179f8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffff8801a0c0c380 RBX: ffff8801c996daa0 RCX: ffffffff815e08fe RDX: 0000000000000000 RSI: ffffffff81c6957d RDI: ffff8801ce3c8600 RBP: ffff8801a0c17b78 R08: ffffed0039c790c1 R09: ffffed0039c790c0 R10: ffffed0039c790c0 R11: ffff8801ce3c8603 R12: ffff8801ce3c8580 R13: dffffc0000000000 R14: ffff8801ce3c8600 R15: ffff8801a0c17b50 FS: 0000000001c21940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000625208 CR3: 00000001a13fc000 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:00007ffcfec8a7d8 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffcfec8c580 RDI: 00007ffcfec8c580 RBP: 00007ffcfec8c580 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000001c22940 R13: 0000000000000000 R14: 0000000000000561 R15: 000000000003716a Code: 85 64 06 00 00 e8 27 98 b2 ff 4c 89 f7 e8 df f5 aa 05 48 8b 9d e8 fe ff ff e8 13 98 b2 ff 48 3b 9d c0 fe ff ff 0f 85 cc fe ff ff 01 98 b2 ff 65 ff 05 ba 57 3b 7e e8 f5 97 b2 ff 45 31 c9 45 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4507 Comm: syz-executor6 Not tainted 4.17.0-rc4+ #14 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:separate_irq_context kernel/locking/lockdep.c:3074 [inline] RIP: 0010:__lock_acquire+0x902/0x5140 kernel/locking/lockdep.c:3422 RSP: 0018:ffff8801a15df530 EFLAGS: 00000802 RAX: 0000000000000000 RBX: 00000000000000b8 RCX: 1ffff100342ba575 RDX: 5f64f138361eba1f RSI: ffff8801a15d2b38 RDI: ffff8801a15d2ba9 RBP: ffff8801a15df8c0 R08: 0000000000000008 R09: 0000000000000003 R10: ffff8801a15d2bb0 R11: ffff8801a15d2300 R12: 00000000000000b8 R13: ffff8801a15d2b88 R14: 000000000000000e R15: 0000000000000000 FS: 0000000001b95940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f20fd68a000 CR3: 00000001a14c9000 CR4: 00000000001406e0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920 seqcount_lockdep_reader_access include/linux/seqlock.h:81 [inline] read_seqcount_begin include/linux/seqlock.h:164 [inline] read_seqbegin include/linux/seqlock.h:433 [inline] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] d_walk+0x1c0/0xc80 fs/dcache.c:1248 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:00007ffc15d45eb8 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffc15d47c60 RDI: 00007ffc15d47c60 RBP: 00007ffc15d47c60 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000001b96940 R13: 0000000000000000 R14: 000000000000050f R15: 00000000000370c7 Code: 7a 48 8b b4 24 90 00 00 00 48 8d 04 80 4c 8d 6c c6 d8 48 b8 00 00 00 00 00 fc ff df 49 8d 7d 21 48 89 f9 48 c1 e9 03 0f b6 04 01 <48> 89 f9 83 e1 07 38 c8 7f 08 84 c0 0f 85 7c 32 00 00 49 8d 7a