Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.82' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 32.478090] ------------[ cut here ]------------ [ 32.483175] WARNING: CPU: 0 PID: 8089 at fs/inode.c:343 inc_nlink.cold+0x11/0x18 [ 32.490710] Kernel panic - not syncing: panic_on_warn set ... [ 32.490710] [ 32.498058] CPU: 0 PID: 8089 Comm: syz-executor278 Not tainted 4.19.211-syzkaller #0 [ 32.505922] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.515255] Call Trace: [ 32.517838] dump_stack+0x1fc/0x2ef [ 32.521452] panic+0x26a/0x50e [ 32.524629] ? __warn_printk+0xf3/0xf3 [ 32.528507] ? inc_nlink.cold+0x11/0x18 [ 32.532469] ? __probe_kernel_read+0x130/0x1b0 [ 32.537031] ? __warn.cold+0x5/0x5a [ 32.540639] ? __warn+0xe4/0x200 [ 32.543987] ? inc_nlink.cold+0x11/0x18 [ 32.547942] __warn.cold+0x20/0x5a [ 32.551463] ? inc_nlink.cold+0x11/0x18 [ 32.555442] report_bug+0x262/0x2b0 [ 32.559052] do_error_trap+0x1d7/0x310 [ 32.562922] ? math_error+0x310/0x310 [ 32.566709] ? __irq_work_queue_local+0x101/0x160 [ 32.571542] ? irq_work_queue+0x29/0x80 [ 32.575503] ? error_entry+0x72/0xd0 [ 32.579329] ? trace_hardirqs_off_caller+0x6e/0x210 [ 32.584336] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.589167] invalid_op+0x14/0x20 [ 32.592608] RIP: 0010:inc_nlink.cold+0x11/0x18 [ 32.597173] 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 [ 32.616059] RSP: 0018:ffff88809d217ce8 EFLAGS: 00010282 [ 32.621495] RAX: 0000000000000024 RBX: ffff88808db566c0 RCX: 0000000000000000 [ 32.628928] RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed1013a42f8f [ 32.636179] RBP: 0000000000000000 R08: 0000000000000024 R09: 0000000000000000 [ 32.643431] R10: 0000000000000005 R11: 0000000000000000 R12: ffff88808db56708 [ 32.650855] R13: ffff88808e5b74a0 R14: ffff8880b3756c00 R15: ffff8880b0d74a40 [ 32.658121] ? vprintk_func+0x81/0x180 [ 32.661996] ? inc_nlink.cold+0x11/0x18 [ 32.665951] v9fs_vfs_mkdir_dotl+0x4eb/0x610 [ 32.670340] ? v9fs_vfs_create_dotl+0x30/0x30 [ 32.674819] ? cap_task_prctl+0x750/0xd30 [ 32.678951] ? capable_wrt_inode_uidgid+0x1d2/0x220 [ 32.683958] ? generic_permission+0x116/0x4d0 [ 32.688435] ? inode_permission.part.0+0x10c/0x450 [ 32.693347] vfs_mkdir+0x508/0x7a0 [ 32.696870] do_mkdirat+0x262/0x2d0 [ 32.700479] ? __ia32_sys_mknod+0x120/0x120 [ 32.704797] ? trace_hardirqs_off_caller+0x6e/0x210 [ 32.709794] ? do_syscall_64+0x21/0x620 [ 32.713792] do_syscall_64+0xf9/0x620 [ 32.717594] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.722768] RIP: 0033:0x7fef17341829 [ 32.726461] 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 [ 32.745347] RSP: 002b:00007ffd3f371918 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 [ 32.753041] RAX: ffffffffffffffda RBX: 00007ffd3f371928 RCX: 00007fef17341829 [ 32.760291] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200002c0 [ 32.767542] RBP: 00007ffd3f371920 R08: 00007fef172ffaf0 R09: 00007fef172ffaf0 [ 32.774803] R10: 0000000020000340 R11: 0000000000000246 R12: 0000000000000000 [ 32.782059] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 32.789608] Kernel Offset: disabled [ 32.793448] Rebooting in 86400 seconds..