watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor1:4526] Modules linked in: irq event stamp: 17057122 hardirqs last enabled at (17057121): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (17057121): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (17057121): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (17057121): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (17057121): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (17057122): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (2268108): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (2268055): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (2268055): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4526 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:seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] RIP: 0010:read_seqcount_begin include/linux/seqlock.h:164 [inline] RIP: 0010:read_seqbegin include/linux/seqlock.h:433 [inline] RIP: 0010:read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] RIP: 0010:d_walk+0x840/0xc80 fs/dcache.c:1248 RSP: 0018:ffff8801a2a379f8 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff8801a2a28440 RBX: 0000000000000293 RCX: 1ffff1003454519d RDX: 0000000000000000 RSI: ffffffff81c6995b RDI: 0000000000000293 RBP: ffff8801a2a37b78 R08: ffff8801a2a28c78 R09: 0000000000000006 R10: ffff8801a2a28440 R11: 0000000000000000 R12: 0000000000000200 R13: dffffc0000000000 R14: 1ffff10034546f82 R15: ffff8801a2a37b50 FS: 0000000002764940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000276d978 CR3: 00000001a2a02000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 00000000200001c0 DR2: 0000000020000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: 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:00007ffcea52cfc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffcea52ed70 RDI: 00007ffcea52ed70 RBP: 00007ffcea52ed70 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 0000000002765940 R13: 0000000000000000 R14: 000000000000026b R15: 000000000001e7ab Code: 88 48 89 f8 48 c1 e8 03 42 80 3c 28 00 0f 85 1e 04 00 00 48 83 3d 18 f2 0a 07 00 0f 84 29 02 00 00 e8 35 94 b2 ff 48 89 df 57 9d <0f> 1f 44 00 00 e8 26 94 b2 ff 49 8d 5f 80 48 c1 eb 03 4c 01 eb Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4530 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:perf_trace_lock_acquire+0x2c/0x980 include/trace/events/lock.h:13 RSP: 0018:ffff88019fdbf890 EFLAGS: 00000802 RAX: ffff88019c6c0910 RBX: 1ffff10033fb7ee6 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: ffff880199ce3538 RDI: ffffffff88d77120 RBP: ffff88019fdbf8b8 R08: 0000000000000000 R09: ffff880199ce3538 R10: ffffffff815bf400 R11: dffffc0000000000 R12: ffff88019fdbf890 R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff88d77120 FS: 0000000001e99940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffcfb7f9f5c CR3: 000000019fd8d000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x38e/0x520 kernel/locking/lockdep.c:3919 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:310 [inline] d_walk+0x261/0xc80 fs/dcache.c:1250 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:00007ffcfb7fa668 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffcfb7fc410 RDI: 00007ffcfb7fc410 RBP: 00007ffcfb7fc410 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 0000000001e9a940 R13: 0000000000000000 R14: 000000000000025f R15: 000000000001e763 Code: ba 00 00 00 00 00 fc ff df 55 49 89 f1 48 89 e5 41 57 49 89 ff 41 56 41 55 41 54 4c 8d 65 d8 53 48 8d 9d 78 fe ff ff 48 c1 eb 03 <48> 8d 04 13 48 81 ec b0 01 00 00 89 8d 68 fe ff ff 48 c7 85 78