watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor1:4585] Modules linked in: irq event stamp: 15419950 hardirqs last enabled at (15419949): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (15419949): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (15419949): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (15419949): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (15419949): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (15419950): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (15419560): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (15419553): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (15419553): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4585 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_acquire+0x257/0x520 kernel/locking/lockdep.c:3923 RSP: 0018:ffff8801a215f8d8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 1ffff1003442bf20 RCX: 0000000000000000 RDX: 1ffffffff11a316d RSI: ffff8801a2154978 RDI: 0000000000000286 RBP: ffff8801a215f9c8 R08: 0000000000000d19 R09: 0000000000000004 R10: ffff8801a2154a18 R11: ffff8801a2154140 R12: ffff8801a2154140 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 00000000011e6940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffee9b6bf7c CR3: 00000001a2003000 CR4: 00000000001406f0 DR0: 00000000200001c0 DR1: 00000000200001c0 DR2: 0000000020000000 DR3: 0000000020000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: _raw_spin_lock_nested+0x28/0x40 kernel/locking/spinlock.c:354 d_walk+0x3ad/0xc80 fs/dcache.c:1274 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:00007ffee9b6c688 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffee9b6e430 RDI: 00007ffee9b6e430 RBP: 00007ffee9b6e430 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 00000000011e7940 R13: 0000000000000000 R14: 0000000000000c25 R15: 000000000006e226 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: 4589 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:__lock_acquire+0xf6/0x5140 kernel/locking/lockdep.c:3290 RSP: 0018:ffff88019fb97520 EFLAGS: 00000086 RAX: ffffed0033f72eb8 RBX: 1ffff10033f72f20 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffff8801b522e358 RBP: ffff88019fb978a8 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: ffff88019fb8e240 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801b522e358 FS: 0000000001012940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000004ce280 CR3: 000000019fb52000 CR4: 00000000001406e0 DR0: 00000000200001c0 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920 _raw_spin_lock_nested+0x28/0x40 kernel/locking/spinlock.c:354 d_walk+0x3ad/0xc80 fs/dcache.c:1274 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:00007ffd85abc178 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffd85abdf20 RDI: 00007ffd85abdf20 RBP: 00007ffd85abdf20 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000001013940 R13: 0000000000000000 R14: 0000000000000a09 R15: 000000000006e1f8 Code: f2 c7 40 34 00 f2 f2 f2 c7 40 38 f2 f2 f2 f2 c7 40 3c 00 f2 f2 f2 c7 40 40 f2 f2 f2 f2 c7 40 44 00 00 00 f2 c7 40 48 f2 f2 f2 f2 40 54 f3 f3 f3 f3 48 c7 c0 a0 b8 09 89 48 c1 e8 03 0f b6 14