[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 62.848346][ T26] audit: type=1800 audit(1563960814.887:25): pid=9053 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 62.880943][ T26] audit: type=1800 audit(1563960814.887:26): pid=9053 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 62.931501][ T26] audit: type=1800 audit(1563960814.897:27): pid=9053 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.1.50' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 74.900263][ T9208] IPVS: ftp: loaded support on port[0] = 21 [ 74.957547][ T9209] ------------[ cut here ]------------ [ 74.963241][ T9209] WARNING: CPU: 0 PID: 9209 at fs/overlayfs/file.c:55 ovl_real_fdget_meta.cold+0x11/0x1e [ 74.973019][ T9209] Kernel panic - not syncing: panic_on_warn set ... [ 74.979586][ T9209] CPU: 0 PID: 9209 Comm: syz-executor873 Not tainted 5.2.0-next-20190718 #41 [ 74.988328][ T9209] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.998387][ T9209] Call Trace: [ 75.001686][ T9209] dump_stack+0x172/0x1f0 [ 75.006018][ T9209] ? ovl_read_iter+0x320/0x363 [ 75.010765][ T9209] panic+0x2dc/0x755 [ 75.014644][ T9209] ? add_taint.cold+0x16/0x16 [ 75.019313][ T9209] ? __kasan_check_write+0x14/0x20 [ 75.024407][ T9209] ? __warn.cold+0x5/0x4c [ 75.028716][ T9209] ? __warn+0xe7/0x1e0 [ 75.032767][ T9209] ? ovl_real_fdget_meta.cold+0x11/0x1e [ 75.038398][ T9209] __warn.cold+0x20/0x4c [ 75.042644][ T9209] ? wake_up_klogd+0x99/0xd0 [ 75.047241][ T9209] ? ovl_real_fdget_meta.cold+0x11/0x1e [ 75.052776][ T9209] report_bug+0x263/0x2b0 [ 75.057092][ T9209] do_error_trap+0x11b/0x200 [ 75.061670][ T9209] do_invalid_op+0x37/0x50 [ 75.066069][ T9209] ? ovl_real_fdget_meta.cold+0x11/0x1e [ 75.071619][ T9209] invalid_op+0x14/0x20 [ 75.075762][ T9209] RIP: 0010:ovl_real_fdget_meta.cold+0x11/0x1e [ 75.081895][ T9209] Code: e9 b3 fd ff ff e8 2c 93 4e ff e9 fb fd ff ff e8 22 93 4e ff e9 15 fe ff ff e8 a8 56 14 ff 48 c7 c7 60 78 b3 87 e8 80 f9 fd fe <0f> 0b 41 bc fb ff ff ff e9 68 c6 ff ff e8 8a 56 14 ff 48 c7 c7 60 [ 75.101568][ T9209] RSP: 0018:ffff888090fbfdc0 EFLAGS: 00010286 [ 75.107614][ T9209] RAX: 0000000000000024 RBX: 0000000004048000 RCX: 0000000000000000 [ 75.115573][ T9209] RDX: 0000000000000000 RSI: ffffffff815c3a26 RDI: ffffed10121f7faa [ 75.123653][ T9209] RBP: ffff888090fbfdf0 R08: 0000000000000024 R09: ffffed1015d060b1 [ 75.131634][ T9209] R10: ffffed1015d060b0 R11: ffff8880ae830587 R12: 000000000000a000 [ 75.139606][ T9209] R13: ffff8880a82e42c0 R14: ffff8880a82e4338 R15: ffff888089052460 [ 75.147624][ T9209] ? vprintk_func+0x86/0x189 [ 75.152249][ T9209] ovl_llseek+0x105/0x3b0 [ 75.156575][ T9209] ? ovl_write_iter+0xc20/0xc20 [ 75.161414][ T9209] ? mutex_lock_nested+0x16/0x20 [ 75.166363][ T9209] ? ovl_write_iter+0xc20/0xc20 [ 75.171231][ T9209] ksys_lseek+0x116/0x1b0 [ 75.175546][ T9209] __x64_sys_lseek+0x73/0xb0 [ 75.180141][ T9209] do_syscall_64+0xfd/0x6a0 [ 75.184674][ T9209] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 75.190551][ T9209] RIP: 0033:0x441ce9 [ 75.194429][ T9209] Code: e8 1c b4 02 00 48 83 c4 18 c3 0f 1f 80 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 0f 83 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 75.214031][ T9209] RSP: 002b:00007ffeb6c24db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000008 [ 75.222453][ T9209] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441ce9 [ 75.230414][ T9209] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003 [ 75.238374][ T9209] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 75.246344][ T9209] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 75.254297][ T9209] R13: 0000000000402af0 R14: 0000000000000000 R15: 0000000000000000 [ 75.263155][ T9209] Kernel Offset: disabled [ 75.267529][ T9209] Rebooting in 86400 seconds..