watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor7:4591] Modules linked in: irq event stamp: 10893864 hardirqs last enabled at (10893863): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (10893863): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (10893863): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (10893863): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (10893863): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (10893864): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (216186): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (215821): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (215821): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4591 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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:783 [inline] RIP: 0010:lock_release+0x4d4/0xa10 kernel/locking/lockdep.c:3942 RSP: 0018:ffff88019eba78a0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 1ffff10033d74f19 RCX: 1ffff10033d7353d RDX: 1ffffffff11a316d RSI: 0000000000000005 RDI: 0000000000000286 RBP: ffff88019eba79d0 R08: 1ffff10033d74f1d R09: ffff88019eba7728 R10: 0000000000000003 R11: 0000000000000004 R12: ffff88019eb9a1c0 R13: ffff8801b327b698 R14: ffff88019eb9a1c0 R15: ffff88019eba78e8 FS: 0000000001a95940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fffd3aa9c1c CR3: 000000019e20e000 CR4: 00000000001406f0 DR0: 0000000020000280 DR1: 0000000020000280 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __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:00007fffd3aaa328 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007fffd3aac0d0 RDI: 00007fffd3aac0d0 RBP: 00007fffd3aac0d0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000001a96940 R13: 0000000000000000 R14: 0000000000000108 R15: 0000000000012cf5 Code: 00 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 a3 03 00 00 48 83 3d 73 84 74 07 00 0f 84 b8 02 00 00 48 8b bd e8 fe 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: 4593 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:strlen+0x67/0xa0 lib/string.c:482 RSP: 0018:ffff88019dd7f6b8 EFLAGS: 00000046 RAX: ffffffff87cbbfcd RBX: dffffc0000000000 RCX: 0000000000000005 RDX: 0000000000000006 RSI: ffffffff88d8e320 RDI: ffffffff87cbbfc0 RBP: ffff88019dd7f6d0 R08: ffffffff88d8e320 R09: ffffed003b5e46c2 R10: ffffed003b5e46c2 R11: ffff8801daf23613 R12: ffffffff87cbbfc0 R13: ffffffff88d8e320 R14: dffffc0000000000 R15: ffffffff88d77060 FS: 000000000101a940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001023978 CR3: 000000019dd50000 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:00007ffe0a026a08 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffe0a0287b0 RDI: 00007ffe0a0287b0 RBP: 00007ffe0a0287b0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 000000000101b940 R13: 0000000000000000 R14: 0000000000000108 R15: 0000000000012ce6 Code: 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 48 83 c4 08 31 c0 5b 41 5c