watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor1:4552] Modules linked in: irq event stamp: 13604348 hardirqs last enabled at (13604347): [<ffffffff81c6992f>] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (13604347): [<ffffffff81c6992f>] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (13604347): [<ffffffff81c6992f>] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (13604347): [<ffffffff81c6992f>] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (13604347): [<ffffffff81c6992f>] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (13604348): [<ffffffff87800905>] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (4379984): [<ffffffff87a00778>] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (4379259): [<ffffffff81475241>] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (4379259): [<ffffffff81475241>] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4552 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:ffff8801a33178f0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 1ffff10034662f23 RCX: 0000000000000000 RDX: 1ffffffff11a316d RSI: ffff8801a3308ef8 RDI: 0000000000000286 RBP: ffff8801a33179e0 R08: 0000000000000008 R09: 0000000000000004 R10: ffff8801a3308f98 R11: ffff8801a33086c0 R12: ffff8801a33086c0 R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000 FS: 00000000017bc940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000017c5978 CR3: 00000001a31f5000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000020000000 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:00007ffdcf4e39e8 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffdcf4e5790 RDI: 00007ffdcf4e5790 RBP: 00007ffdcf4e5790 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 00000000017bd940 R13: 0000000000000000 R14: 000000000000081b R15: 000000000004f932 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: 4553 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:strlen+0x62/0xa0 lib/string.c:482 RSP: 0018:ffff8801a0cbf6b8 EFLAGS: 00000046 RAX: ffffffff87d3441b RBX: dffffc0000000000 RCX: 0000000000000003 RDX: 0000000000000000 RSI: ffff880195d12bd8 RDI: ffffffff87d34400 RBP: ffff8801a0cbf6d0 R08: 0000000000000000 R09: ffff880195d12bd8 R10: ffffffff815bf400 R11: dffffc0000000000 R12: ffffffff87d34400 R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff88d77120 FS: 0000000000d0c940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f927e1fa028 CR3: 00000001a0c98000 CR4: 00000000001406e0 DR0: 0000000020000080 DR1: 0000000020000080 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: trace_event_get_offsets_lock_acquire include/trace/events/lock.h:13 [inline] perf_trace_lock_acquire+0xe3/0x980 include/trace/events/lock.h:13 trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x38e/0x520 kernel/locking/lockdep.c:3919 _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:00007ffe508bd8a8 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffe508bf650 RDI: 00007ffe508bf650 RBP: 00007ffe508bf650 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 0000000000d0d940 R13: 0000000000000000 R14: 000000000000082e R15: 000000000004f9cc Code: 3b 48 bb 00 00 00 00 00 fc ff df 4c 89 e0 48 83 c0 01 48 89 c2 48 89 c1 48 c1 ea 03 83 e1 07 0f b6 14 1a 38 ca 7f 04 84 d2 75 23 <80> 38 00 75 de 48 83 c4 08 4c 29 e0 5b 41 5c 5d c3 48 83 c4 08