watchdog: BUG: soft lockup - CPU#0 stuck for 134s! [syz-executor7:4561] Modules linked in: irq event stamp: 53455140 hardirqs last enabled at (53455139): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (53455139): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (53455139): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (53455139): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (53455139): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (53455140): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (182212): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (182157): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (182157): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4561 Comm: syz-executor7 Not tainted 4.17.0-rc7+ #37 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:debug_lockdep_rcu_enabled+0x23/0x90 kernel/rcu/update.c:299 RSP: 0018:ffff8801a3e379e0 EFLAGS: 00000a02 ORIG_RAX: ffffffffffffff13 RAX: ffffffff897c49c0 RBX: ffff8801b2570140 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff8801a3e2ebb8 RDI: ffffffff897c49c0 RBP: ffff8801a3e379e0 R08: 0000000000000008 R09: 0000000000000004 R10: ffff8801a3e2ec58 R11: ffff8801a3e2e380 R12: ffff8801c9b6fdc0 R13: dffffc0000000000 R14: ffff8801c9b6fe40 R15: ffff8801a3e37b50 FS: 00000000028cf940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffdf0d6ac60 CR3: 00000001a3e02000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_read_lock include/linux/rcupdate.h:633 [inline] d_walk+0x4a0/0xc80 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:00007ffe709d0528 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffe709d22d0 RDI: 00007ffe709d22d0 RBP: 00007ffe709d22d0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 00000000028d0940 R13: 0000000000000000 R14: 00000000000000f1 R15: 0000000000011dbf Code: 0f 1f 84 00 00 00 00 00 48 c7 c7 c0 49 7c 89 55 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 48 89 e5 <83> e0 07 83 c0 03 38 d0 7c 04 84 d2 75 4c 8b 15 e9 94 18 08 85 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4562 Comm: syz-executor2 Not tainted 4.17.0-rc7+ #37 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0x201/0x5140 kernel/locking/lockdep.c:3458 RSP: 0018:ffff8801a19df880 EFLAGS: 00000006 RAX: 0000000000000000 RBX: ffffffff89c335e8 RCX: 0000000000000000 RDX: 1ffff1003433a57e RSI: ffff8801a19d2bf8 RDI: ffffed003433bf10 RBP: ffff8801a19df8a8 R08: 0000000000005eeb R09: 0000000000000004 R10: ffff8801a19d2c98 R11: ffff8801a19d23c0 R12: 1ffff1003433becc R13: 0000000000000000 R14: 20519b0094d3cacf R15: 0000000000000001 FS: 0000000002a02940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000002a0b978 CR3: 00000001a18ca000 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:00007fffa3890028 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007fffa3891dd0 RDI: 00007fffa3891dd0 RBP: 00007fffa3891dd0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000002a03940 R13: 0000000000000000 R14: 00000000000000f6 R15: 0000000000011bd9 Code: 98 00 00 00 48 8d 79 08 48 c7 01 00 00 00 00 48 83 e7 f8 48 c7 41 50 00 00 00 00 48 29 f9 83 c1 58 c1 e9 03 f3 48 ab 48 8d 65 d8 <44> 89 f8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 b8 00 00 00 00 00