[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.16' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 32.978325] ------------[ cut here ]------------ [ 32.983281] WARNING: CPU: 1 PID: 8085 at fs/inode.c:343 inc_nlink.cold+0x11/0x18 [ 32.990813] Kernel panic - not syncing: panic_on_warn set ... [ 32.990813] [ 32.998167] CPU: 1 PID: 8085 Comm: syz-executor377 Not tainted 4.19.211-syzkaller #0 [ 33.006034] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.015378] Call Trace: [ 33.017949] dump_stack+0x1fc/0x2ef [ 33.021559] panic+0x26a/0x50e [ 33.024751] ? __warn_printk+0xf3/0xf3 [ 33.028624] ? inc_nlink.cold+0x11/0x18 [ 33.032589] ? __probe_kernel_read+0x130/0x1b0 [ 33.037149] ? __warn.cold+0x5/0x5a [ 33.040755] ? __warn+0xe4/0x200 [ 33.044099] ? inc_nlink.cold+0x11/0x18 [ 33.048050] __warn.cold+0x20/0x5a [ 33.051569] ? io_schedule_timeout+0x140/0x140 [ 33.056131] ? inc_nlink.cold+0x11/0x18 [ 33.060083] report_bug+0x262/0x2b0 [ 33.063695] do_error_trap+0x1d7/0x310 [ 33.067574] ? math_error+0x310/0x310 [ 33.071354] ? __irq_work_queue_local+0x101/0x160 [ 33.076191] ? irq_work_queue+0x29/0x80 [ 33.080147] ? error_entry+0x72/0xd0 [ 33.083846] ? trace_hardirqs_off_caller+0x6e/0x210 [ 33.088846] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.093671] invalid_op+0x14/0x20 [ 33.097103] RIP: 0010:inc_nlink.cold+0x11/0x18 [ 33.101665] Code: c0 74 04 3c 03 7e 08 8b 5d 48 e9 e7 68 b4 f9 4c 89 e7 e8 aa 99 a3 f9 eb ee e8 43 bd 6d f9 48 c7 c7 80 b0 74 88 e8 a2 ee fe ff <0f> 0b e9 29 6a b4 f9 e8 2b bd 6d f9 48 8d 7b 40 b8 ff ff 37 00 48 [ 33.120544] RSP: 0018:ffff888092327ce8 EFLAGS: 00010282 [ 33.125901] RAX: 0000000000000024 RBX: ffff88808db096c0 RCX: 0000000000000000 [ 33.133151] RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed1012464f8f [ 33.140411] RBP: 0000000000000000 R08: 0000000000000024 R09: 0000000000000000 [ 33.147659] R10: 0000000000000005 R11: 0000000000000000 R12: ffff88808db09708 [ 33.154906] R13: ffff88808e5244a0 R14: ffff8880a5a7e880 R15: ffff8880aa77f500 [ 33.162166] ? vprintk_func+0x81/0x180 [ 33.166037] ? inc_nlink.cold+0x11/0x18 [ 33.169996] v9fs_vfs_mkdir_dotl+0x4eb/0x610 [ 33.174387] ? v9fs_vfs_create_dotl+0x30/0x30 [ 33.178867] ? cap_task_prctl+0xb50/0xd30 [ 33.182996] ? capable_wrt_inode_uidgid+0x1d2/0x220 [ 33.187991] ? generic_permission+0x116/0x4d0 [ 33.192468] ? inode_permission.part.0+0x10c/0x450 [ 33.197377] vfs_mkdir+0x508/0x7a0 [ 33.200900] do_mkdirat+0x262/0x2d0 [ 33.204520] ? __ia32_sys_mknod+0x120/0x120 [ 33.208832] ? trace_hardirqs_off_caller+0x6e/0x210 [ 33.213831] ? do_syscall_64+0x21/0x620 [ 33.217797] do_syscall_64+0xf9/0x620 [ 33.221584] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.226750] RIP: 0033:0x7fd7e3566829 [ 33.230441] Code: 28 c3 e8 5a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 [ 33.249319] RSP: 002b:00007fff32f7c078 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 [ 33.257005] RAX: ffffffffffffffda RBX: 00007fff32f7c088 RCX: 00007fd7e3566829 [ 33.264427] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200002c0 [ 33.271864] RBP: 00007fff32f7c080 R08: 00007fd7e3524af0 R09: 00007fd7e3524af0 [ 33.279113] R10: 0000000020000340 R11: 0000000000000246 R12: 0000000000000000 [ 33.286449] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 33.294030] Kernel Offset: disabled [ 33.297684] Rebooting in 86400 seconds..