watchdog: BUG: soft lockup - CPU#0 stuck for 134s! [syz-executor6:4592] Modules linked in: irq event stamp: 81195902 hardirqs last enabled at (81195901): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (81195901): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (81195901): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (81195901): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (81195901): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (81195902): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (1899734): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (1898863): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (1898863): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4592 Comm: syz-executor6 Not tainted 4.17.0-rc4+ #18 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:ffff88019e23f8f0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 1ffff10033c47f23 RCX: 0000000000000000 RDX: 1ffffffff11a316d RSI: ffff88019e234a38 RDI: 0000000000000286 RBP: ffff88019e23f9e0 R08: 0000000000000008 R09: 0000000000000004 R10: ffff88019e234ad8 R11: ffff88019e234200 R12: ffff88019e234200 R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000 FS: 00000000010b7940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000004ce280 CR3: 000000019e231000 CR4: 00000000001406f0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 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:00007ffc03ecfa78 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffc03ed1820 RDI: 00007ffc03ed1820 RBP: 00007ffc03ed1820 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 00000000010b8940 R13: 0000000000000000 R14: 00000000000003c7 R15: 000000000002f0d0 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: 4593 Comm: syz-executor2 Not tainted 4.17.0-rc4+ #18 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:check_kcov_mode kernel/kcov.c:69 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x26/0x50 kernel/kcov.c:101 RSP: 0018:ffff88019dc679e8 EFLAGS: 00000246 RAX: ffff88019dc5a240 RBX: 0000000000000000 RCX: ffffffff81c6927a RDX: 0000000000000000 RSI: ffffffff81c692b3 RDI: ffffffff88d18b60 RBP: ffff88019dc679e8 R08: ffff88019dc5a240 R09: ffffed0039325d18 R10: ffffed0039325d18 R11: ffff8801c992e8c3 R12: ffff88019dc67c50 R13: dffffc0000000000 R14: 1ffff10033b8cf82 R15: ffff88019dc67b50 FS: 000000000124f940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000006fb018 CR3: 000000019dc27000 CR4: 00000000001406e0 DR0: 0000000020000080 DR1: 0000000020000080 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: arch_local_save_flags arch/x86/include/asm/paravirt.h:778 [inline] arch_local_irq_save arch/x86/include/asm/paravirt.h:800 [inline] seqcount_lockdep_reader_access include/linux/seqlock.h:80 [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+0x153/0xc80 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:00007fffb464fa48 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007fffb46517f0 RDI: 00007fffb46517f0 RBP: 00007fffb46517f0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000001250940 R13: 0000000000000000 R14: 00000000000003e4 R15: 000000000002f0cf Code: 08 5d c3 66 90 55 65 48 8b 04 25 c0 ed 01 00 65 8b 15 af bf 88 7e 48 89 e5 81 e2 00 01 1f 00 48 8b 75 08 75 2b 8b 90 78 12 00 00 <83> fa 02 75 20 48 8b 88 80 12 00 00 8b 80 7c 12 00 00 48 8b 11