watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor2:4507] Modules linked in: irq event stamp: 12732982 hardirqs last enabled at (12732981): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (12732981): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (12732981): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (12732981): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (12732981): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (12732982): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (1241298): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (1241173): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (1241173): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4507 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:__sanitizer_cov_trace_pc+0x0/0x50 kernel/kcov.c:146 RSP: 0018:ffff8801a49ef900 EFLAGS: 00000292 ORIG_RAX: ffffffffffffff13 RAX: ffffed003493df24 RBX: 1ffff1003493df24 RCX: ffffffff815e0571 RDX: 1ffff100332ce49e RSI: ffff880199672460 RDI: ffff8801a49efc10 RBP: ffff8801a49ef9e8 R08: ffffed00332ce49d R09: ffffed00332ce49c R10: ffffed00332ce49c R11: ffff8801996724e3 R12: ffff8801a49efc10 R13: ffff880199672460 R14: dffffc0000000000 R15: ffff8801a49ef9c0 FS: 0000000002851940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffcf66d0f88 CR3: 00000001a3dcd000 CR4: 00000000001406f0 DR0: 00000000200001c0 DR1: 00000000200001c0 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: d_walk+0x3c3/0xc80 fs/dcache.c:1276 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:00007ffcf66d1748 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffcf66d34f0 RDI: 00007ffcf66d34f0 RBP: 00007ffcf66d34f0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000002852940 R13: 0000000000000000 R14: 0000000000000295 R15: 000000000001f558 Code: 8d 14 dd 28 00 00 00 4d 39 d0 72 1b 49 83 c1 01 4a 89 7c 10 e0 4a 89 74 10 e8 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 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4510 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:list_empty include/linux/list.h:203 [inline] RIP: 0010:shrink_dentry_list+0xcb/0x7c0 fs/dcache.c:1052 RSP: 0018:ffff8801a2987ab0 EFLAGS: 00000246 RAX: ffffed0034530f62 RBX: ffff8801a2987c18 RCX: ffffffff81c6a0d9 RDX: 0000000000000000 RSI: ffffffff81c65af3 RDI: ffff8801a2987c18 RBP: ffff8801a2987b78 R08: ffff8801a297c400 R09: ffffed00332d8044 R10: ffffed00332d8044 R11: ffff8801996c0223 R12: ffff8801a2987c50 R13: dffffc0000000000 R14: 1ffff10034530f82 R15: ffffed0034530f85 FS: 0000000001151940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffcd4023ff8 CR3: 00000001a2963000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: shrink_dcache_parent+0xba/0x230 fs/dcache.c:1490 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:00007ffcd40247b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffcd4026560 RDI: 00007ffcd4026560 RBP: 00007ffcd4026560 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000001152940 R13: 0000000000000000 R14: 000000000000026c R15: 000000000001f533 Code: 06 00 00 48 8b 85 70 ff ff ff 48 8b 18 48 8b 85 68 ff ff ff 80 38 00 0f 85 70 06 00 00 48 8b 85 68 ff ff ff 48 89 5d 98 c6 00 f8 <48> 39 9d 70 ff ff ff 0f 84 cb 04 00 00 e8 43 d2 b2 ff 31 d2 be