watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor2:4511] Modules linked in: irq event stamp: 11498300 hardirqs last enabled at (11498299): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (11498299): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (11498299): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (11498299): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (11498299): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (11498300): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (188254): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (170743): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (170743): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4511 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:_raw_spin_lock_nested+0x1/0x40 kernel/locking/spinlock.c:352 RSP: 0018:ffff8801a3a6f9e8 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff8801a3a66600 RBX: ffff8801d4f2e810 RCX: ffffffff81c694ae RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8801d4f2e7a0 RBP: ffff8801a3a6fb78 R08: ffff8801a3a66600 R09: ffffed003a9e5cc8 R10: ffffed003a9e5cc8 R11: ffff8801d4f2e643 R12: ffff8801d4f2e720 R13: dffffc0000000000 R14: ffff8801d4f2e7a0 R15: ffff8801a3a6fb50 FS: 00000000015ef940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000015f8978 CR3: 00000001a3a55000 CR4: 00000000001406f0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 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:00007fff3a23ae08 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007fff3a23cbb0 RDI: 00007fff3a23cbb0 RBP: 00007fff3a23cbb0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 00000000015f0940 R13: 0000000000000000 R14: 00000000000000ff R15: 0000000000010f7e Code: 45 31 c9 41 b8 01 00 00 00 31 c9 31 d2 31 f6 e8 86 82 eb f9 48 89 df e8 ee 7a ec f9 48 8b 5d f8 58 c9 c3 0f 1f 80 00 00 00 00 55 <65> ff 05 78 63 90 78 48 89 e5 53 48 89 fb ff 75 08 48 8d 7f 18 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4508 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:mark_held_locks+0xfc/0x160 kernel/locking/lockdep.c:2812 RSP: 0018:ffff8801ac2c79a8 EFLAGS: 00000086 RAX: 0000000000000001 RBX: ffff8801ac2bc540 RCX: 1ffff100358579bd RDX: 1ffffffff144e7e2 RSI: ffff8801ac2bcdc8 RDI: ffffffff8a273f10 RBP: ffff8801ac2c79b8 R08: ffff8801ac2bcd78 R09: 0000000000000002 R10: ffff8801ac2bc540 R11: 0000000000000000 R12: ffffffff81c6992f R13: dffffc0000000000 R14: 0000000000000003 R15: ffffed00358579ae FS: 00000000023ab940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000023b4978 CR3: 00000001ac09b000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __trace_hardirqs_on_caller kernel/locking/lockdep.c:2828 [inline] trace_hardirqs_on_caller+0x19e/0x5c0 kernel/locking/lockdep.c:2883 trace_hardirqs_on+0xd/0x10 kernel/locking/lockdep.c:2890 seqcount_lockdep_reader_access include/linux/seqlock.h:83 [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+0x80f/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:00007ffcec117c68 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffcec119a10 RDI: 00007ffcec119a10 RBP: 00007ffcec119a10 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 00000000023ac940 R13: 0000000000000000 R14: 00000000000000f9 R15: 0000000000010f79 Code: 85 c0 74 1e 41 0f b6 07 83 c3 01 84 c0 74 04 3c 03 7e 54 41 39 9c 24 30 08 00 00 7f 91 b8 01 00 00 00 48 83 c4 20 5b 41 5c 41 5d <41> 5e 41 5f 5d c3 48 8b 7d c0 89 75 d0 e8 82 58 59 00 8b 75 d0