watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor0:4543] Modules linked in: irq event stamp: 13262276 hardirqs last enabled at (13262275): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (13262275): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (13262275): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (13262275): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (13262275): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (13262276): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (9941648): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (9941511): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (9941511): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4543 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:__read_once_size include/linux/compiler.h:188 [inline] RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:31 [inline] RIP: 0010:atomic_read include/asm-generic/atomic-instrumented.h:22 [inline] RIP: 0010:rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:349 [inline] RIP: 0010:rcu_is_watching+0xbc/0x140 kernel/rcu/tree.c:1075 RSP: 0018:ffff8801ae88f958 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 00000000000f0746 RBX: 1ffff10035d11f2c RCX: ffff8801ae88f980 RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffff8801dae23610 RBP: ffff8801ae88f9e8 R08: ffffed003b5c46c3 R09: ffffed003b5c46c2 R10: ffffed003b5c46c2 R11: ffff8801dae23613 R12: ffff8801ae88f980 R13: ffff8801dae23610 R14: ffff8801ae88f9c0 R15: dffffc0000000000 FS: 0000000000b75940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe8c9d8cbc CR3: 00000001d031c000 CR4: 00000000001406f0 DR0: 00000000200001c0 DR1: 00000000200001c0 DR2: 00000000200001c0 DR3: 00000000200001c0 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: rcu_read_lock include/linux/rcupdate.h:633 [inline] d_walk+0xa1c/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:00007ffe8c9d93c8 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffe8c9db170 RDI: 00007ffe8c9db170 RBP: 00007ffe8c9db170 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 0000000000b76940 R13: 0000000000000000 R14: 0000000000000577 R15: 0000000000040b6a Code: 4c 89 e8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 80 00 00 00 48 ba 00 00 00 00 00 fc ff df 41 8b 44 24 10 4d 8d 66 c0 4c 89 e1 <48> c1 e9 03 0f b6 14 11 84 d2 74 05 80 fa 03 7e 43 49 c1 ec 03 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4552 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_release+0x4af/0xa10 kernel/locking/lockdep.c:3942 RSP: 0018:ffff8801a206f8a0 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: 1ffff1003440df19 RCX: 1ffff1003440c525 RDX: ffffffff88d18b68 RSI: 0000000000000005 RDI: ffffffff88d18b68 RBP: ffff8801a206f9d0 R08: 1ffff1003440df1d R09: ffffed00369199ac R10: 0000000000000003 R11: 0000000000000004 R12: ffff8801a2062100 R13: ffff8801b48ccd78 R14: ffff8801a2062100 R15: ffff8801a206f8e8 FS: 0000000001726940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffee01e6fcc CR3: 00000001a208c000 CR4: 00000000001406e0 DR0: 00000000200001c0 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 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:00007ffee01e76d8 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffee01e9480 RDI: 00007ffee01e9480 RBP: 00007ffee01e9480 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000001727940 R13: 0000000000000000 R14: 00000000000005b0 R15: 0000000000040b60 Code: d0 7c 08 84 d2 0f 85 db 03 00 00 48 c7 c7 68 8b d1 88 48 b8 00 00 00 00 00 fc ff df 41 c7 84 24 34 08 00 00 00 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