[ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty2. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ 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 '10.128.0.20' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 69.402362][ T27] audit: type=1400 audit(1587777362.142:8): avc: denied { execmem } for pid=7033 comm="syz-executor477" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 69.413665][ T7033] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 69.446127][ T7033] ------------[ cut here ]------------ [ 69.451768][ T7033] WARNING: CPU: 0 PID: 7033 at fs/inode.c:360 inc_nlink+0x144/0x160 [ 69.460355][ T7033] Kernel panic - not syncing: panic_on_warn set ... [ 69.467635][ T7033] CPU: 0 PID: 7033 Comm: syz-executor477 Not tainted 5.7.0-rc2-syzkaller #0 [ 69.476975][ T7033] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.487018][ T7033] Call Trace: [ 69.490314][ T7033] dump_stack+0x188/0x20d [ 69.494651][ T7033] ? inc_nlink+0x60/0x160 [ 69.499006][ T7033] panic+0x2e3/0x75c [ 69.502906][ T7033] ? add_taint.cold+0x16/0x16 [ 69.507853][ T7033] ? printk+0xba/0xed [ 69.511946][ T7033] ? kmsg_dump_rewind_nolock+0xd9/0xd9 [ 69.518229][ T7033] ? __warn.cold+0x14/0x35 [ 69.523000][ T7033] ? __warn+0xd5/0x1c8 [ 69.527189][ T7033] ? inc_nlink+0x144/0x160 [ 69.531590][ T7033] __warn.cold+0x2f/0x35 [ 69.535912][ T7033] ? inc_nlink+0x144/0x160 [ 69.540337][ T7033] report_bug+0x27b/0x2f0 [ 69.544726][ T7033] do_error_trap+0x12b/0x220 [ 69.549334][ T7033] ? inc_nlink+0x144/0x160 [ 69.553959][ T7033] do_invalid_op+0x32/0x40 [ 69.558376][ T7033] ? inc_nlink+0x144/0x160 [ 69.562974][ T7033] invalid_op+0x23/0x30 [ 69.567138][ T7033] RIP: 0010:inc_nlink+0x144/0x160 [ 69.572170][ T7033] Code: ff 4c 89 e7 e8 ed 6f ee ff e9 42 ff ff ff 4c 89 e7 e8 70 6f ee ff e9 fc fe ff ff 4c 89 e7 e8 63 6f ee ff eb d4 e8 ac a8 b0 ff <0f> 0b e9 6e ff ff ff e8 60 6f ee ff e9 44 ff ff ff e8 56 6f ee ff [ 69.592969][ T7033] RSP: 0018:ffffc90000f87d88 EFLAGS: 00010293 [ 69.599706][ T7033] RAX: ffff8880a403c4c0 RBX: ffff888084620a00 RCX: ffffffff81c28550 [ 69.607950][ T7033] RDX: 0000000000000000 RSI: ffffffff81c285e4 RDI: 0000000000000007 [ 69.616822][ T7033] RBP: 0000000000000000 R08: ffff8880a403c4c0 R09: fffffbfff1512911 [ 69.628554][ T7033] R10: ffffffff8a894887 R11: fffffbfff1512910 R12: ffff888084620a48 [ 69.638602][ T7033] R13: ffff88808723b2e0 R14: ffff88808723b340 R15: 0000000000000000 [ 69.646575][ T7033] ? inc_nlink+0xb0/0x160 [ 69.650884][ T7033] ? inc_nlink+0x144/0x160 [ 69.655282][ T7033] ? inc_nlink+0x144/0x160 [ 69.659690][ T7033] minix_mkdir+0x71/0x1b0 [ 69.664013][ T7033] ? minix_create+0x30/0x30 [ 69.668721][ T7033] ? security_inode_mkdir+0xd9/0x110 [ 69.675429][ T7033] vfs_mkdir+0x419/0x690 [ 69.679663][ T7033] do_mkdirat+0x21e/0x280 [ 69.684123][ T7033] ? __ia32_sys_mknod+0xb0/0xb0 [ 69.689002][ T7033] ? filp_close+0x12f/0x170 [ 69.693505][ T7033] ? trace_hardirqs_off_caller+0x55/0x230 [ 69.699242][ T7033] do_syscall_64+0xf6/0x7d0 [ 69.703789][ T7033] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 69.709711][ T7033] RIP: 0033:0x444ac9 [ 69.713754][ T7033] Code: 0d d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 db d7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 69.737221][ T7033] RSP: 002b:00007ffeebd596a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 [ 69.745786][ T7033] RAX: ffffffffffffffda RBX: 00007ffeebd596b0 RCX: 0000000000444ac9 [ 69.755358][ T7033] RDX: 00000000000001ff RSI: 0000000020000080 RDI: 0000000000000003 [ 69.764478][ T7033] RBP: 0000000000000000 R08: 0000000000400eb0 R09: 0000000000400eb0 [ 69.772741][ T7033] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402730 [ 69.780715][ T7033] R13: 00000000004027c0 R14: 0000000000000000 R15: 0000000000000000 [ 69.790137][ T7033] Kernel Offset: disabled [ 69.794606][ T7033] Rebooting in 86400 seconds..