watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor0:4546] Modules linked in: irq event stamp: 17299874 hardirqs last enabled at (17299873): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (17299873): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (17299873): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (17299873): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (17299873): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (17299874): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (3763626): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (3763315): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (3763315): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4546 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:queued_spin_is_locked include/asm-generic/qspinlock.h:36 [inline] RIP: 0010:debug_spin_unlock kernel/locking/spinlock_debug.c:98 [inline] RIP: 0010:do_raw_spin_unlock+0xf0/0x2e0 kernel/locking/spinlock_debug.c:134 RSP: 0018:ffff8801a3bff948 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000004 RBX: ffff8801964ca220 RCX: ffffffff815e08fe RDX: 1ffff1003477ff2d RSI: 0000000000000004 RDI: ffff8801964ca220 RBP: ffff8801a3bff9d0 R08: ffffed0032c99445 R09: ffffed0032c99444 R10: ffffed0032c99444 R11: ffff8801964ca223 R12: 1ffff1003477ff29 R13: ffff8801a3bff968 R14: ffff8801a3bff9a8 R15: 0000000000000001 FS: 0000000001f8e940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff951e9ff8 CR3: 00000001a3be8000 CR4: 00000000001406f0 DR0: 00000000200001c0 DR1: 00000000200001c0 DR2: 00000000200001c0 DR3: 00000000200001c0 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __raw_spin_unlock include/linux/spinlock_api_smp.h:151 [inline] _raw_spin_unlock+0x22/0x30 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:00007fff951ea7d8 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007fff951ec580 RDI: 00007fff951ec580 RBP: 00007fff951ec580 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000001f8f940 R13: 0000000000000000 R14: 00000000000007a7 R15: 00000000000521ec Code: 01 00 00 4d 8d 6e c0 44 8b 3b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 97 01 00 00 <49> c1 ed 03 45 89 7e c0 48 b8 00 00 00 00 00 fc ff df 41 c6 44 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4548 Comm: syz-executor6 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+0x37d/0x5140 kernel/locking/lockdep.c:3348 RSP: 0018:ffff8801a170f530 EFLAGS: 00000806 RAX: ffff8801a16e5008 RBX: 00000000000000b9 RCX: 0000000000000000 RDX: 0000000000000001 RSI: 1ffff100342dca05 RDI: ffff8801a16e5028 RBP: ffff8801a170f8c0 R08: 0000000000000001 R09: 0000000000000003 R10: 0000000000000078 R11: ffff8801a16e4780 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000002 R15: ffffffff88c12648 FS: 0000000001e87940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001e90978 CR3: 00000001a15b2000 CR4: 00000000001406e0 DR0: 0000000020000080 DR1: 0000000020000080 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920 seqcount_lockdep_reader_access include/linux/seqlock.h:81 [inline] read_seqcount_begin include/linux/seqlock.h:164 [inline] read_seqbegin include/linux/seqlock.h:433 [inline] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] d_walk+0x1c0/0xc80 fs/dcache.c:1248 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:00007ffe2af06978 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffe2af08720 RDI: 00007ffe2af08720 RBP: 00007ffe2af08720 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000001e88940 R13: 0000000000000000 R14: 00000000000006fc R15: 00000000000521f5 Code: 3c 49 c1 e2 03 83 c3 01 45 85 c9 74 44 48 b9 00 00 00 00 00 fc ff df 4a 8d 44 16 d8 48 8d 78 20 48 89 fe 48 c1 ee 03 0f b6 0c 0e <84> c9 74 09 80 f9 03 0f 8e c9 10 00 00 0f b7 48 20 81 e1 ff 1f