watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor3:4593] Modules linked in: irq event stamp: 13974316 hardirqs last enabled at (13974315): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (13974315): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (13974315): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (13974315): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (13974315): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (13974316): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (1337974): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (1337821): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (1337821): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4593 Comm: syz-executor3 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:ffff88019e65f8d8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 1ffff10033ccbf20 RCX: 0000000000000000 RDX: 1ffffffff11a316d RSI: ffff88019e656a78 RDI: 0000000000000286 RBP: ffff88019e65f9c8 R08: 0000000000003f69 R09: 0000000000000003 R10: ffff88019e656af0 R11: ffff88019e656240 R12: ffff88019e656240 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 000000000277a940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000002783978 CR3: 000000019e633000 CR4: 00000000001406f0 DR0: 00000000200001c0 DR1: 00000000200001c0 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __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:00007fff740a5d18 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007fff740a7ac0 RDI: 00007fff740a7ac0 RBP: 00007fff740a7ac0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 000000000277b940 R13: 0000000000000000 R14: 00000000000002d4 R15: 00000000000248a9 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: 4590 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:validate_chain kernel/locking/lockdep.c:2424 [inline] RIP: 0010:__lock_acquire+0xa36/0x5140 kernel/locking/lockdep.c:3431 RSP: 0018:ffff8801a0d5f530 EFLAGS: 00000806 RAX: dffffc0000000000 RBX: ffffffff89c2d5a8 RCX: 0000000099ca7042 RDX: 1ffffffff1213714 RSI: ffff8801a0d529b8 RDI: ffffffff89c2d5b8 RBP: ffff8801a0d5f8c0 R08: 000000000000520d R09: 0000000000000003 R10: ffff8801a0d52a30 R11: ffff8801a0d52180 R12: 1ffff100341abece R13: 0000000000000000 R14: 0ed2ce38924fa2f3 R15: 0000000000000000 FS: 0000000000a87940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020f6bffb CR3: 00000001a12d8000 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:00007fff852765a8 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007fff85278350 RDI: 00007fff85278350 RBP: 00007fff85278350 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 0000000000a88940 R13: 0000000000000000 R14: 00000000000002bc R15: 00000000000248a8 Code: 00 00 41 8b 42 20 25 00 80 04 00 3d 00 00 04 00 0f 84 be 03 00 00 48 c7 c2 a0 b8 09 89 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 14 02 48 c7 c0 a0 b8 09 89 83 e0 07 83 c0 03 38 d0 7c 08