watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor6:4555] Modules linked in: irq event stamp: 12691706 hardirqs last enabled at (12691705): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (12691705): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (12691705): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (12691705): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (12691705): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (12691706): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (301844): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (301569): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (301569): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4555 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:__read_once_size include/linux/compiler.h:188 [inline] RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:31 [inline] RIP: 0010:atomic_read include/asm-generic/atomic-instrumented.h:22 [inline] RIP: 0010:queued_spin_is_locked include/asm-generic/qspinlock.h:36 [inline] RIP: 0010:debug_spin_unlock kernel/locking/spinlock_debug.c:98 [inline] RIP: 0010:do_raw_spin_unlock+0xcf/0x2e0 kernel/locking/spinlock_debug.c:134 RSP: 0018:ffff88019d727948 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000003 RBX: ffff8801c9b36340 RCX: ffffffff815e08fe RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8801c9b36340 RBP: ffff88019d7279d0 R08: ffffed0039366c69 R09: ffffed0039366c68 R10: ffffed0039366c68 R11: ffff8801c9b36343 R12: 1ffff10033ae4f29 R13: ffff88019d727968 R14: ffff88019d7279a8 R15: 0000000000000001 FS: 000000000154f940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001558978 CR3: 000000019d6f5000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_unlock include/linux/spinlock_api_smp.h:151 [inline] _raw_spin_unlock+0x22/0x30 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:00007ffc355f8bd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffc355fa980 RDI: 00007ffc355fa980 RBP: 00007ffc355fa980 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000001550940 R13: 0000000000000000 R14: 0000000000000111 R15: 00000000000123f8 Code: 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 14 02 48 89 d8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 a8 01 00 00 4d 8d 6e c0 44 8b 3b <48> b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 0f b6 04 02 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4552 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:__lock_release kernel/locking/lockdep.c:3726 [inline] RIP: 0010:lock_release+0x43e/0xa10 kernel/locking/lockdep.c:3939 RSP: 0018:ffff88019d8ef8b8 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 1ffff10033b1df1c RCX: 1ffff10033b1c125 RDX: 1ffff10033b1c126 RSI: 0000000000000005 RDI: ffff88019d8e0100 RBP: ffff88019d8ef9e8 R08: 0000000000000000 R09: ffffed003b5e46c2 R10: 0000000000000003 R11: 0000000000000004 R12: 930c62f3d3450c4a R13: ffffffff88d8e320 R14: ffff88019d8e0100 R15: ffff88019d8ef900 FS: 0000000002566940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff3cc2fcbc CR3: 000000019d8e3000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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:00007fff3cc303c8 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007fff3cc32170 RDI: 00007fff3cc32170 RBP: 00007fff3cc32170 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 0000000002567940 R13: 0000000000000000 R14: 0000000000000117 R15: 00000000000123eb Code: 41 83 e2 07 48 c1 ea 03 41 83 c2 03 0f b6 04 02 41 38 c2 7c 08 84 c0 0f 85 be 03 00 00 8b 15 ba 33 14 09 85 d2 0f 84 ce 01 00 00 <48> b8 00 00 00 00 00 fc ff df 4d 89 f8 49 c1 e8 03 41 c6 04 00