[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 43.525375][ T24] audit: type=1800 audit(1563960615.094:25): pid=7938 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 43.544139][ T24] audit: type=1800 audit(1563960615.094:26): pid=7938 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 43.563406][ T24] audit: type=1800 audit(1563960615.094:27): pid=7938 uid=0 auid=4294967295 ses=4294967295 subj=_ 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 '10.128.15.221' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 64.910324][ T8091] IPVS: ftp: loaded support on port[0] = 21 [ 64.961130][ T8092] ------------[ cut here ]------------ [ 64.966790][ T8092] WARNING: CPU: 1 PID: 8092 at fs/overlayfs/file.c:55 ovl_real_fdget_meta+0x57e/0x620 [ 64.981570][ T8092] Kernel panic - not syncing: panic_on_warn set ... [ 64.988287][ T8092] CPU: 1 PID: 8092 Comm: syz-executor187 Not tainted 5.2.0+ #37 [ 64.995893][ T8092] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.006068][ T8092] Call Trace: [ 65.009347][ T8092] dump_stack+0x1d8/0x2f8 [ 65.013718][ T8092] panic+0x29b/0x7d9 [ 65.017603][ T8092] ? __warn+0x126/0x230 [ 65.021739][ T8092] ? nmi_panic+0x97/0x97 [ 65.025962][ T8092] ? __probe_kernel_read+0x14b/0x1a0 [ 65.031278][ T8092] ? ovl_real_fdget_meta+0x57e/0x620 [ 65.036564][ T8092] ? is_valid_bugaddr+0x81/0x100 [ 65.041481][ T8092] __warn+0x22f/0x230 [ 65.045438][ T8092] ? ovl_real_fdget_meta+0x57e/0x620 [ 65.050706][ T8092] report_bug+0x190/0x290 [ 65.055085][ T8092] ? ovl_real_fdget_meta+0x57e/0x620 [ 65.060363][ T8092] do_error_trap+0xd7/0x440 [ 65.064888][ T8092] do_invalid_op+0x36/0x40 [ 65.069330][ T8092] ? ovl_real_fdget_meta+0x57e/0x620 [ 65.074617][ T8092] invalid_op+0x23/0x30 [ 65.078898][ T8092] RIP: 0010:ovl_real_fdget_meta+0x57e/0x620 [ 65.084785][ T8092] Code: c1 03 38 c1 0f 8c 29 fc ff ff 4c 89 ef e8 3a f2 45 ff e9 1c fc ff ff e8 00 a0 0b ff 48 c7 c7 1d 82 7a 88 31 c0 e8 15 81 f4 fe <0f> 0b 41 bc fb ff ff ff e9 2c fc ff ff 48 8b 4d c8 80 e1 07 80 c1 [ 65.104552][ T8092] RSP: 0018:ffff88809131fd90 EFLAGS: 00010246 [ 65.110601][ T8092] RAX: 0000000000000024 RBX: 000000000000a000 RCX: d0eb47e1194f6400 [ 65.118551][ T8092] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 65.126539][ T8092] RBP: ffff88809131fdf0 R08: ffffffff816a0d54 R09: ffffed1015d66030 [ 65.134884][ T8092] R10: ffffed1015d66030 R11: 0000000000000000 R12: 0000000000000000 [ 65.142850][ T8092] R13: ffff888096859338 R14: 0000000004042000 R15: 0000000000002000 [ 65.150818][ T8092] ? tick_nohz_tick_stopped+0x44/0x60 [ 65.156179][ T8092] ovl_llseek+0xba/0x310 [ 65.160407][ T8092] ? fpregs_assert_state_consistent+0xb7/0xe0 [ 65.166451][ T8092] ? ovl_get_link+0x90/0x90 [ 65.170935][ T8092] ? __fdget_pos+0x243/0x2e0 [ 65.175619][ T8092] __x64_sys_lseek+0x15f/0x1f0 [ 65.180376][ T8092] do_syscall_64+0xfe/0x140 [ 65.184908][ T8092] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 65.190780][ T8092] RIP: 0033:0x441ce9 [ 65.194650][ T8092] 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 [ 65.214234][ T8092] RSP: 002b:00007ffed8795f08 EFLAGS: 00000246 ORIG_RAX: 0000000000000008 [ 65.222630][ T8092] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441ce9 [ 65.230585][ T8092] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003 [ 65.238696][ T8092] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 65.246661][ T8092] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 65.254618][ T8092] R13: 0000000000402af0 R14: 0000000000000000 R15: 0000000000000000 [ 65.263644][ T8092] Kernel Offset: disabled [ 65.268029][ T8092] Rebooting in 86400 seconds..