watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor3:4529] Modules linked in: irq event stamp: 12020834 hardirqs last enabled at (12020833): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (12020833): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (12020833): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (12020833): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (12020833): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (12020834): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (449976): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (449725): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (449725): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4529 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_release+0x4d4/0xa10 kernel/locking/lockdep.c:3942 RSP: 0018:ffff8801a3cd78a0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 1ffff1003479af19 RCX: 1ffff100347995e5 RDX: 1ffffffff11a316d RSI: 0000000000000005 RDI: 0000000000000286 RBP: ffff8801a3cd79d0 R08: 1ffff1003479af1d R09: ffffed003586de78 R10: 0000000000000003 R11: 0000000000000004 R12: ffff8801a3cca700 R13: ffff8801ac36f3d8 R14: ffff8801a3cca700 R15: ffff8801a3cd78e8 FS: 0000000000f8a940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000f93978 CR3: 00000001a3c04000 CR4: 00000000001406f0 DR0: 00000000200001c0 DR1: 00000000200001c0 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 000000000000060a 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:00007ffeb3e75f18 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffeb3e77cc0 RDI: 00007ffeb3e77cc0 RBP: 00007ffeb3e77cc0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000000f8b940 R13: 0000000000000000 R14: 0000000000000130 R15: 000000000001299b 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: 4532 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:__read_once_size include/linux/compiler.h:188 [inline] RIP: 0010:lookup_chain_cache kernel/locking/lockdep.c:2314 [inline] RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:2334 [inline] RIP: 0010:validate_chain kernel/locking/lockdep.c:2388 [inline] RIP: 0010:__lock_acquire+0xe7c/0x5140 kernel/locking/lockdep.c:3431 RSP: 0018:ffff8801a15e7520 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: ffffffff89c2d268 RCX: 00000000dc86b1e6 RDX: 1ffffffff143eda2 RSI: ffff8801a15de838 RDI: ffff8801a15de8f9 RBP: ffff8801a15e78a8 R08: 0000000000001ea2 R09: 0000000000000004 R10: ffff8801a15de8d8 R11: ffff8801a15de000 R12: ffff8801a15e7660 R13: 0000000000000000 R14: 4325439067cd1dca R15: 0000000000000000 FS: 00000000019f0940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffde0942ebc CR3: 00000001a1459000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 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:00007ffde09435c8 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffde0945370 RDI: 00007ffde0945370 RBP: 00007ffde0945370 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 00000000019f1940 R13: 0000000000000000 R14: 0000000000000136 R15: 00000000000129a2 Code: 44 24 70 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 b6 33 00 00 4c 8d a4 24 40 01 00 00 4a 8b 1c c5 00 78 1e 8a <48> b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 00