watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor1:4505] Modules linked in: irq event stamp: 8118388 hardirqs last enabled at (8118387): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (8118387): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (8118387): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (8118387): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (8118387): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (8118388): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (224156): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (224085): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (224085): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4505 Comm: syz-executor1 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:ffff8801a45179f8 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff8801a4508440 RBX: 0000000000000293 RCX: 1ffff100348a119d RDX: 0000000000000000 RSI: ffffffff81c6995b RDI: 0000000000000293 RBP: ffff8801a4517b78 R08: ffff8801a4508c78 R09: 0000000000000006 R10: ffff8801a4508440 R11: 0000000000000000 R12: 0000000000000200 R13: dffffc0000000000 R14: 1ffff100348a2f82 R15: ffff8801a4517b50 FS: 000000000249b940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000024a4978 CR3: 00000001a4532000 CR4: 00000000001406f0 DR0: 00000000200001c0 DR1: 00000000200001c0 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:00007fff5d43d818 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007fff5d43f5c0 RDI: 00007fff5d43f5c0 RBP: 00007fff5d43f5c0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 000000000249c940 R13: 0000000000000000 R14: 000000000000012f R15: 0000000000012900 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: 4511 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+0x53/0xa0 lib/string.c:482 RSP: 0018:ffff8801a168f6b8 EFLAGS: 00000802 RAX: ffffffff87cbbfc2 RBX: dffffc0000000000 RCX: ffffffff87cbbfc2 RDX: 1ffffffff0f977f8 RSI: ffffffff88d8e320 RDI: ffffffff87cbbfc0 RBP: ffff8801a168f6d0 R08: ffffffff88d8e320 R09: ffffed003b5e46c2 R10: ffffed003b5e46c2 R11: ffff8801daf23613 R12: ffffffff87cbbfc0 R13: ffffffff88d8e320 R14: dffffc0000000000 R15: ffffffff88d77060 FS: 000000000231c940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffdb5c6ddbc CR3: 00000001a1654000 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 rcu_lock_release include/linux/rcupdate.h:251 [inline] rcu_read_unlock include/linux/rcupdate.h:688 [inline] d_walk+0x716/0xc80 fs/dcache.c:1327 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:00007ffdb5c6e4c8 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffdb5c70270 RDI: 00007ffdb5c70270 RBP: 00007ffdb5c70270 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 000000000231d940 R13: 0000000000000000 R14: 000000000000013b R15: 000000000001292f Code: 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 38 ca 7f 04 84 d2 75 23 80 38 00 75 de 48