watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor2:4567] Modules linked in: irq event stamp: 16020518 hardirqs last enabled at (16020517): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (16020517): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (16020517): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (16020517): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (16020517): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (16020518): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (16020020): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (16020013): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (16020013): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4567 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_switch+0x4a/0x90 kernel/kcov.c:224 RSP: 0018:ffff8801a08ff9c0 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff81c694f7 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000005 RBP: ffff8801a08ff9e8 R08: ffff8801b33d4540 R09: ffffed0032e958fc R10: ffffed0032e958fc R11: ffff8801974ac7e3 R12: ffffffff87d34500 R13: 0000000000000000 R14: 0000000000000005 R15: 0000000000000003 FS: 0000000002336940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc5cfbee2c CR3: 00000001a08de000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: ffffffffffffff00 DR2: 00000000200001c0 DR3: 00000000200001c0 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: d_walk+0x3d7/0xc80 fs/dcache.c:1277 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:00007ffc5cfbf538 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffc5cfc12e0 RDI: 00007ffc5cfc12e0 RBP: 00007ffc5cfc12e0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 0000000002337940 R13: 0000000000000000 R14: 00000000000008c3 R15: 000000000005dddb Code: 41 be 07 00 00 00 48 83 f8 40 75 2d 4c 8b 3e 49 89 f4 49 89 fd 31 db 4d 85 ff 74 1d 49 8b 74 dc 10 48 8b 4d 08 4c 89 ea 4c 89 f7 <48> 83 c3 01 e8 ed fd ff ff 49 39 df 75 e3 5b 41 5c 41 5d 41 5e Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4563 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:__read_once_size include/linux/compiler.h:188 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:69 [inline] RIP: 0010:write_comp_data+0x22/0x70 kernel/kcov.c:122 RSP: 0018:ffff8801a38679d8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81c6923a RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: ffff8801a38679d8 R08: ffff8801a383a400 R09: ffffed003931ae78 R10: ffffed003931ae78 R11: ffff8801c98d73c3 R12: ffff8801a3867c50 R13: dffffc0000000000 R14: 1ffff1003470cf82 R15: ffff8801a3867b50 FS: 0000000002826940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000009eefd8 CR3: 00000001a3e5b000 CR4: 00000000001406e0 DR0: 0000000020000080 DR1: 0000000020000080 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __sanitizer_cov_trace_const_cmp4+0x16/0x20 kernel/kcov.c:188 read_seqbegin_or_lock include/linux/seqlock.h:528 [inline] d_walk+0x11a/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:00007ffcfdd0f668 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffcfdd11410 RDI: 00007ffcfdd11410 RBP: 00007ffcfdd11410 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 0000000002827940 R13: 0000000000000000 R14: 000000000000089d R15: 000000000005dd85 Code: b7 3c 00 e9 86 fc ff ff 90 55 65 4c 8b 04 25 c0 ed 01 00 65 8b 05 1f c0 88 7e 48 89 e5 a9 00 01 1f 00 75 51 41 8b 80 78 12 00 00 <83> f8 03 75 45 49 8b 80 80 12 00 00 45 8b 80 7c 12 00 00 4c 8b