watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor1:4590] Modules linked in: irq event stamp: 16681016 hardirqs last enabled at (16681015): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (16681015): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (16681015): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (16681015): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (16681015): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (16681016): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (4759384): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (4759339): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (4759339): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4590 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:ffff8801a5e378d8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 1ffff10034bc6f20 RCX: 0000000000000000 RDX: 1ffffffff11a316d RSI: ffff8801b0586df8 RDI: 0000000000000286 RBP: ffff8801a5e379c8 R08: 0000000000001511 R09: 0000000000000004 R10: ffff8801b0586e98 R11: ffff8801b05865c0 R12: ffff8801b05865c0 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000001be0940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc8a5d8f6c CR3: 00000001a5e0f000 CR4: 00000000001406f0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 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:00007ffc8a5d9678 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffc8a5db420 RDI: 00007ffc8a5db420 RBP: 00007ffc8a5db420 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000001be1940 R13: 0000000000000000 R14: 0000000000000965 R15: 0000000000067443 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-executor7 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+0x99/0x520 kernel/locking/lockdep.c:3909 RSP: 0018:ffff8801a85778f0 EFLAGS: 00000286 RAX: ffffed00350aef23 RBX: 1ffff100350aef23 RCX: dffffc0000000000 RDX: ffff8801a8568240 RSI: 0000000000000000 RDI: ffff8801a8568a74 RBP: ffff8801a85779e0 R08: 0000000000000000 R09: 0000000000000000 R10: ffffed00328d3dd0 R11: ffff88019469ee83 R12: 0000000000000000 R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000002414940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000241d978 CR3: 00000001a8451000 CR4: 00000000001406e0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 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:00007ffff351bb78 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffff351d920 RDI: 00007ffff351d920 RBP: 00007ffff351d920 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000002415940 R13: 0000000000000000 R14: 000000000000094d R15: 0000000000067427 Code: 0c 5d 81 89 b5 2c ff ff ff c7 00 f1 f1 f1 f1 c7 40 04 00 f2 f2 f2 c7 40 08 f2 f2 f2 f2 c7 40 0c 00 f2 f2 f2 c7 40 10 f3 f3 f3 f3 <48> 89 f8 48 c1 e8 03 0f b6 0c 08 48 89 f8 83 e0 07 83 c0 03 38