watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor3:4542] Modules linked in: irq event stamp: 24768818 hardirqs last enabled at (24768817): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (24768817): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (24768817): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (24768817): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (24768817): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (24768818): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (16881230): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (16880817): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (16880817): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4542 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:__sanitizer_cov_trace_switch+0x1/0x90 kernel/kcov.c:201 RSP: 0018:ffff88019ef6f9e8 EFLAGS: 00000296 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff815e0571 RDX: 0000000000000000 RSI: ffffffff87d34560 RDI: 0000000000000000 RBP: ffff88019ef6fb78 R08: ffffed0039cf9ced R09: ffffed0039cf9cec R10: ffffed0039cf9cec R11: ffff8801ce7ce763 R12: 00000000000131c6 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88019ef6fb50 FS: 0000000001df5940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001dfe978 CR3: 000000019ef4b000 CR4: 00000000001406f0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000020000000 DR3: 0000000020000000 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:00007ffcc6736a68 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffcc6738810 RDI: 00007ffcc6738810 RBP: 00007ffcc6738810 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 0000000001df6940 R13: 0000000000000000 R14: 0000000000001714 R15: 00000000000eebde Code: 5d c3 0f 1f 84 00 00 00 00 00 55 48 89 f2 48 89 fe bf 07 00 00 00 48 89 e5 48 8b 4d 08 e8 48 fe ff ff 5d c3 66 0f 1f 44 00 00 55 <48> 89 e5 41 57 41 56 41 55 41 54 53 48 8b 46 08 48 83 f8 10 74 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4538 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:select_collect+0x7f/0x5f0 fs/dcache.c:1447 RSP: 0018:ffff8801a03c7908 EFLAGS: 00000293 RAX: ffff8801a03b8680 RBX: 1ffff10034078f24 RCX: ffffffff815e0571 RDX: 0000000000000000 RSI: ffffffff81c5f0ff RDI: ffff8801a03c7c10 RBP: ffff8801a03c79e8 R08: ffffed0030c91471 R09: ffffed0030c91470 R10: ffffed0030c91470 R11: ffff88018648a383 R12: ffff8801a03c7c10 R13: ffff88018648a300 R14: dffffc0000000000 R15: ffff8801a03c79c0 FS: 0000000002231940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffeddc79020 CR3: 00000001a023c000 CR4: 00000000001406e0 DR0: 00000000200001c0 DR1: 0000000000000000 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:00007ffc928e0ea8 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffc928e2c50 RDI: 00007ffc928e2c50 RBP: 00007ffc928e2c50 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 0000000002232940 R13: 0000000000000000 R14: 000000000000120d R15: 00000000000eebe4 Code: 80 f0 c5 81 c7 00 f1 f1 f1 f1 c7 40 04 00 f2 f2 f2 c7 40 08 f2 f2 f2 f2 c7 40 0c 00 f2 f2 f2 c7 40 10 f3 f3 f3 f3 e8 91 3c b3 ff <4c> 89 e0 48 c1 e8 03 42 80 3c 30 00 0f 85 29 04 00 00 4d 39 2c