watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor3:4520] Modules linked in: irq event stamp: 18516168 hardirqs last enabled at (18516167): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (18516167): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (18516167): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (18516167): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (18516167): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (18516168): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (10571512): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (10571447): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (10571447): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4520 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: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:ffff8801a0c2f8f0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 1ffff10034185f23 RCX: 0000000000000000 RDX: 1ffffffff11a316d RSI: ffff8801a0c22ab8 RDI: 0000000000000286 RBP: ffff8801a0c2f9e0 R08: 0000000000000008 R09: 0000000000000004 R10: ffff8801a0c22b58 R11: ffff8801a0c22280 R12: ffff8801a0c22280 R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000 FS: 000000000231b940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5fdb8e8db8 CR3: 00000001a0c01000 CR4: 00000000001406f0 DR0: 00000000200001c0 DR1: 00000000200001c0 DR2: 00000000200001c0 DR3: 00000000200001c0 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: rcu_lock_acquire include/linux/rcupdate.h:246 [inline] rcu_read_lock include/linux/rcupdate.h:632 [inline] d_walk+0x49b/0xc80 fs/dcache.c:1303 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:00007ffeb5ff1c18 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffeb5ff39c0 RDI: 00007ffeb5ff39c0 RBP: 00007ffeb5ff39c0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 000000000231c940 R13: 0000000000000000 R14: 0000000000000b61 R15: 00000000000737a6 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: 4516 Comm: syz-executor0 Not tainted 4.17.0-rc4+ #14 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0x1fd/0x5140 kernel/locking/lockdep.c:3290 RSP: 0018:ffff8801a6a87520 EFLAGS: 00000006 RAX: 0000000000000000 RBX: ffffffff89c2d328 RCX: 0000000000000000 RDX: 1ffff10034d4f136 RSI: ffff8801a6a789b8 RDI: ffffed0034d50f10 RBP: ffff8801a6a878a8 R08: 0000000000003f4b R09: 0000000000000003 R10: ffff8801a6a78a30 R11: ffff8801a6a78180 R12: 1ffff10034d50ecc R13: 0000000000000000 R14: 825406ae2ce9acad R15: 0000000000000001 FS: 0000000001a3d940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001a4e9b8 CR3: 00000001a6a66000 CR4: 00000000001406e0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920 __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:00007fffbe7d0f98 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007fffbe7d2d40 RDI: 00007fffbe7d2d40 RBP: 00007fffbe7d2d40 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 0000000001a3e940 R13: 0000000000000000 R14: 0000000000000add R15: 00000000000737e6 Code: 48 03 8c 24 98 00 00 00 48 8d 79 08 48 c7 01 00 00 00 00 48 83 e7 f8 48 c7 41 50 00 00 00 00 48 29 f9 83 c1 58 c1 e9 03 f3 48 ab <48> 8d 65 d8 44 89 f8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 b8 00