watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor2:4550] Modules linked in: irq event stamp: 13573266 hardirqs last enabled at (13573265): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (13573265): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (13573265): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (13573265): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (13573265): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (13573266): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (672576): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (672339): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (672339): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4550 Comm: syz-executor2 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_acquire+0x257/0x520 kernel/locking/lockdep.c:3923 RSP: 0018:ffff88019de978d8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 1ffff10033bd2f20 RCX: 0000000000000000 RDX: 1ffffffff11a316d RSI: ffff88019de8acb8 RDI: 0000000000000286 RBP: ffff88019de979c8 R08: 0000000000006bb8 R09: 0000000000000003 R10: ffff88019de8ad30 R11: ffff88019de8a480 R12: ffff88019de8a480 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000002714940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffcb0434d6c CR3: 000000019de33000 CR4: 00000000001406f0 DR0: 00000000200001c0 DR1: 00000000200001c0 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:310 [inline] d_walk+0x261/0xc80 fs/dcache.c:1250 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:00007ffcb0435478 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffcb0437220 RDI: 00007ffcb0437220 RBP: 00007ffcb0437220 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000002715940 R13: 0000000000000000 R14: 000000000000019d R15: 0000000000015dc6 Code: 00 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 5e 02 00 00 48 83 3d e0 7c 74 07 00 0f 84 c8 01 00 00 48 8b bd 20 ff 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: 4547 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:debug_spin_unlock kernel/locking/spinlock_debug.c:99 [inline] RIP: 0010:do_raw_spin_unlock+0x11f/0x2e0 kernel/locking/spinlock_debug.c:134 RSP: 0018:ffff88019e85f948 EFLAGS: 00000202 RAX: dffffc0000000000 RBX: ffff8801c9be80c0 RCX: ffffffff815e08fe RDX: 1ffff10033d0bf2d RSI: 0000000000000004 RDI: ffff8801c9be80c0 RBP: ffff88019e85f9d0 R08: ffffed003937d019 R09: ffffed003937d018 R10: ffffed003937d018 R11: ffff8801c9be80c3 R12: 1ffff10033d0bf29 R13: ffff8801c9be80d0 R14: ffff88019e85f9a8 R15: 0000000000000001 FS: 0000000000d39940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffff1cc7cdc CR3: 000000019e802000 CR4: 00000000001406e0 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:00007ffff1cc83e8 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffff1cca190 RDI: 00007ffff1cca190 RBP: 00007ffff1cca190 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000000d3a940 R13: 0000000000000000 R14: 000000000000019c R15: 0000000000015dc2 Code: 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 6b 10 <4c> 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 7e 01 00 00 65 48 8b 04