watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor1:4547] Modules linked in: irq event stamp: 13123944 hardirqs last enabled at (13123943): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (13123943): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (13123943): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (13123943): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (13123943): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (13123944): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (3780710): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (3780519): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (3780519): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4547 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:lock_release+0x4d4/0xa10 kernel/locking/lockdep.c:3942 RSP: 0018:ffff8801d79778a0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 1ffff1003af2ef19 RCX: 1ffff1003af6ede5 RDX: 1ffffffff11a316d RSI: 0000000000000005 RDI: 0000000000000286 RBP: ffff8801d79779d0 R08: 1ffff1003af2ef1d R09: ffff8801d7977728 R10: 0000000000000003 R11: 0000000000000004 R12: ffff8801d7b76700 R13: ffff8801b29af098 R14: ffff8801d7b76700 R15: ffff8801d79778e8 FS: 000000000299b940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000029a4978 CR3: 00000001adac5000 CR4: 00000000001406f0 DR0: 0000000020000000 DR1: 00000000200001c0 DR2: 00000000200001c0 DR3: 00000000200001c0 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:00007ffebfc34c68 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffebfc36a10 RDI: 00007ffebfc36a10 RBP: 00007ffebfc36a10 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 000000000299c940 R13: 0000000000000000 R14: 00000000000006ca R15: 0000000000049c1a 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: 4565 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:check_kcov_mode kernel/kcov.c:69 [inline] RIP: 0010:write_comp_data+0x22/0x70 kernel/kcov.c:122 RSP: 0018:ffff88019d02f9d8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81c698a1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: ffff88019d02f9d8 R08: ffff88019d026340 R09: ffffed0039338f9c R10: ffffed0039338f9c R11: ffff8801c99c7ce3 R12: 0000000000005176 R13: dffffc0000000000 R14: ffff8801c99c7c60 R15: ffff88019d02fb50 FS: 0000000000ace940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe134e7ff8 CR3: 000000019d7e5000 CR4: 00000000001406e0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __sanitizer_cov_trace_const_cmp4+0x16/0x20 kernel/kcov.c:188 done_seqretry include/linux/seqlock.h:541 [inline] d_walk+0x781/0xc80 fs/dcache.c:1333 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:00007ffe134e87d8 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffe134ea580 RDI: 00007ffe134ea580 RBP: 00007ffe134ea580 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000000acf940 R13: 0000000000000000 R14: 0000000000000747 R15: 0000000000049b8b Code: b7 3c 00 e9 86 fc ff ff 90 55 65 4c 8b 04 25 c0 ed 01 00 65 8b 05 1f c0 88 7e 48 89 e5 a9 00 01 1f 00 75 51 41 8b 80 78 12 00 00 <83> f8 03 75 45 49 8b 80 80 12 00 00 45 8b 80 7c 12 00 00 4c 8b