watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor4:4487] Modules linked in: irq event stamp: 12433110 hardirqs last enabled at (12433109): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (12433109): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (12433109): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (12433109): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (12433109): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (12433110): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (298116): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (297835): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (297835): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4487 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:arch_local_save_flags arch/x86/include/asm/paravirt.h:778 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/paravirt.h:800 [inline] RIP: 0010:seqcount_lockdep_reader_access include/linux/seqlock.h:80 [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+0x13a/0xc80 fs/dcache.c:1248 RSP: 0018:ffff8801a2f779f8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff11a316c RBX: 0000000000000000 RCX: ffffffff81c6923a RDX: 0000000000000000 RSI: ffffffff81c69247 RDI: ffffffff88d18b60 RBP: ffff8801a2f77b78 R08: ffff8801a2f6e700 R09: ffffed00372014fc R10: ffffed00372014fc R11: ffff8801b900a7e3 R12: ffff8801a2f77c50 R13: dffffc0000000000 R14: 1ffff100345eef82 R15: ffff8801a2f77b50 FS: 0000000002682940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000268b978 CR3: 00000001a2f4e000 CR4: 00000000001406f0 DR0: 00000000200001c0 DR1: 00000000200001c0 DR2: 0000000000000000 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:00007ffc7fdb80e8 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffc7fdb9e90 RDI: 00007ffc7fdb9e90 RBP: 00007ffc7fdb9e90 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000002683940 R13: 0000000000000000 R14: 000000000000011f R15: 000000000001169c Code: ff 83 e3 01 89 de e8 66 9c b2 ff 85 db 0f 85 0c 01 00 00 e8 49 9b b2 ff 48 c7 c7 60 8b d1 88 48 89 f8 48 c1 e8 03 42 80 3c 28 00 <0f> 85 7d 0a 00 00 48 83 3d f8 f8 0a 07 00 0f 84 59 07 00 00 e8 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4488 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:check_kcov_mode kernel/kcov.c:67 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x1a/0x50 kernel/kcov.c:101 RSP: 0018:ffff8801a28879e8 EFLAGS: 00000246 RAX: ffff8801a2878740 RBX: ffff8801b90263b0 RCX: ffffffff815e08fe RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8801b90261e0 RBP: ffff8801a28879e8 R08: ffffed0037204c3d R09: ffffed0037204c3c R10: ffffed0037204c3c R11: ffff8801b90261e3 R12: ffff8801b9026160 R13: dffffc0000000000 R14: ffff8801b90261e0 R15: ffff8801a2887b50 FS: 00000000021ad940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b33922000 CR3: 00000001a2860000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: d_walk+0x45d/0xc80 fs/dcache.c:1266 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:00007ffd26356f98 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffd26358d40 RDI: 00007ffd26358d40 RBP: 00007ffd26358d40 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 00000000021ae940 R13: 0000000000000000 R14: 0000000000000111 R15: 0000000000011272 Code: 4a 89 54 10 f0 4a 89 4c d8 20 4c 89 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