watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor6:4600] Modules linked in: irq event stamp: 10664314 hardirqs last enabled at (10664313): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (10664313): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (10664313): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (10664313): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (10664313): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (10664314): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (665714): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (665633): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (665633): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4600 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: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:ffff88019f8f78d8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 1ffff10033f1ef20 RCX: 0000000000000000 RDX: 1ffffffff11a316d RSI: ffff88019f8eed38 RDI: 0000000000000286 RBP: ffff88019f8f79c8 R08: 0000000000001511 R09: 0000000000000004 R10: ffff88019f8eedd8 R11: ffff88019f8ee500 R12: ffff88019f8ee500 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000001298940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000012a1978 CR3: 000000019ff13000 CR4: 00000000001406f0 DR0: 00000000200001c0 DR1: 00000000200001c0 DR2: 0000000000000000 DR3: 0000000000000000 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:00007ffcdaf65068 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffcdaf66e10 RDI: 00007ffcdaf66e10 RBP: 00007ffcdaf66e10 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 0000000001299940 R13: 0000000000000000 R14: 000000000000013b R15: 0000000000013fec 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: 4603 Comm: syz-executor7 Not tainted 4.17.0-rc4+ #14 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:strlen+0x5e/0xa0 lib/string.c:482 RSP: 0018:ffff88019d0876a0 EFLAGS: 00000093 RAX: ffffffff87d34415 RBX: dffffc0000000000 RCX: 0000000000000005 RDX: 0000000000000000 RSI: ffff8801ce586c18 RDI: ffffffff87d34400 RBP: ffff88019d0876b8 R08: ffff8801ce586c18 R09: ffffed0039cb0d80 R10: ffffed0039cb0d80 R11: ffff8801ce586c03 R12: ffffffff87d34400 R13: ffff8801ce586c18 R14: dffffc0000000000 R15: ffffffff88d77060 FS: 00000000015d8940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000015e1978 CR3: 000000019d03e000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_event_get_offsets_lock_acquire include/trace/events/lock.h:13 [inline] perf_trace_lock+0xd6/0x900 include/trace/events/lock.h:39 trace_lock_release include/trace/events/lock.h:58 [inline] lock_release+0x5e6/0xa10 kernel/locking/lockdep.c:3938 __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:00007ffca0b37828 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffca0b395d0 RDI: 00007ffca0b395d0 RBP: 00007ffca0b395d0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 00000000015d9940 R13: 0000000000000000 R14: 0000000000000134 R15: 0000000000013fdb Code: 3c 24 00 74 3b 48 bb 00 00 00 00 00 fc ff df 4c 89 e0 48 83 c0 01 48 89 c2 48 89 c1 48 c1 ea 03 83 e1 07 0f b6 14 1a 38 ca 7f 04 <84> d2 75 23 80 38 00 75 de 48 83 c4 08 4c 29 e0 5b 41 5c 5d c3