watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor4:4536] Modules linked in: irq event stamp: 19005284 hardirqs last enabled at (19005283): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (19005283): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (19005283): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (19005283): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (19005283): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (19005284): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (7848516): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (7848329): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (7848329): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4536 Comm: syz-executor4 Not tainted 4.17.0-rc4+ #14 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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+0x108/0x2e0 kernel/locking/spinlock_debug.c:134 RSP: 0018:ffff88019ec17948 EFLAGS: 00000a06 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: ffff8801ce2608c0 RCX: ffffffff815e08fe RDX: 1ffff10033d82f2d RSI: 0000000000000004 RDI: ffff8801ce2608c0 RBP: ffff88019ec179d0 R08: ffffed0039c4c119 R09: ffffed0039c4c118 R10: ffffed0039c4c118 R11: ffff8801ce2608c3 R12: 1ffff10033d82f29 R13: 1ffff10033d82f2d R14: ffff88019ec179a8 R15: 0000000000000001 FS: 0000000001869940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000007003f8 CR3: 000000019f391000 CR4: 00000000001406f0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 00000000200001c0 DR3: 00000000200001c0 DR6: 00000000fffe0ff0 DR7: 0000000000000600 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:00007ffe548e06d8 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffe548e2480 RDI: 00007ffe548e2480 RBP: 00007ffe548e2480 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 000000000186a940 R13: 0000000000000000 R14: 0000000000000c80 R15: 000000000008331d Code: c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 97 01 00 00 49 c1 ed 03 45 89 7e c0 48 b8 00 00 00 00 00 fc ff df 41 c6 44 05 00 f8 <45> 85 ff 0f 84 27 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8d Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4532 Comm: syz-executor3 Not tainted 4.17.0-rc4+ #14 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__write_once_size include/linux/compiler.h:215 [inline] RIP: 0010:write_comp_data+0x6c/0x70 kernel/kcov.c:144 RSP: 0018:ffff8801a1ad79d8 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff81c69cfc RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffff8801a1ad79d8 R08: ffff8801a1aca1c0 R09: ffffed003b5e46c2 R10: ffffed003b5e46c2 R11: ffff8801daf23613 R12: 0000000000009e34 R13: dffffc0000000000 R14: ffff880197866160 R15: ffff8801a1ad7b50 FS: 0000000001dcf940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f557abbba30 CR3: 00000001a19b9000 CR4: 00000000001406e0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __sanitizer_cov_trace_const_cmp1+0x1a/0x20 kernel/kcov.c:174 rcu_read_unlock include/linux/rcupdate.h:684 [inline] d_walk+0xbdc/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:00007fff80a42ae8 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007fff80a44890 RDI: 00007fff80a44890 RBP: 00007fff80a44890 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000001dd0940 R13: 0000000000000000 R14: 0000000000000c9b R15: 000000000008333c Code: 00 00 00 4e 8d 14 dd 28 00 00 00 4d 39 d0 72 1b 49 83 c1 01 4a 89 7c 10 e0 4a 89 74 10 e8 4a 89 54 10 f0 4a 89 4c d8 20 4c 89 08 <5d> c3 66 90 55 65 48 8b 04 25 c0 ed 01 00 65 8b 15 af bf 88 7e