watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor2:4550] Modules linked in: irq event stamp: 11037286 hardirqs last enabled at (11037285): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (11037285): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (11037285): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (11037285): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (11037285): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (11037286): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (866296): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (866197): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (866197): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4550 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:__x86_indirect_thunk_rax+0xc/0x20 arch/x86/lib/retpoline.S:32 RSP: 0018:ffff8801a055f9e8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: ffffffff81c5f080 RBX: ffff8801c9889d90 RCX: ffffffff815e0571 RDX: 1ffff100393113a6 RSI: ffff8801c9889ca0 RDI: ffff8801a055fc10 RBP: ffff8801a055fb78 R08: ffffed00393113a5 R09: ffffed00393113a4 R10: ffffed00393113a4 R11: ffff8801c9889d23 R12: ffff8801c9889ca0 R13: dffffc0000000000 R14: ffff8801c9889d20 R15: ffff8801a055fb50 FS: 00000000014fc940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff61f11cdc CR3: 00000001a0415000 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:00007fff61f123e8 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007fff61f14190 RDI: 00007fff61f14190 RBP: 00007fff61f14190 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 00000000014fd940 R13: 0000000000000000 R14: 000000000000022b R15: 000000000001cbda Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 e8 07 00 00 00 f3 90 0f ae e8 eb f9 <48> 89 04 24 c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 e8 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4552 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:strlen+0x45/0xa0 lib/string.c:482 RSP: 0018:ffff88019fb5f6b8 EFLAGS: 00000002 RAX: ffffffff87d34418 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff8801c986c778 RDI: ffffffff87d34400 RBP: ffff88019fb5f6d0 R08: 0000000000000000 R09: ffff8801c986c778 R10: ffffffff815bf400 R11: dffffc0000000000 R12: ffffffff87d34400 R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff88d77120 FS: 00000000029c8940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000701154 CR3: 000000019fb31000 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_acquire+0xe3/0x980 include/trace/events/lock.h:13 trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x38e/0x520 kernel/locking/lockdep.c:3919 _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:00007ffdb135f828 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffdb13615d0 RDI: 00007ffdb13615d0 RBP: 00007ffdb13615d0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 00000000029c9940 R13: 0000000000000000 R14: 0000000000000216 R15: 000000000001cba5 Code: 53 48 83 ec 08 0f b6 04 02 48 89 fa 83 e2 07 38 d0 7f 04 84 c0 75 4d 41 80 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