[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 67.916719][ T27] audit: type=1800 audit(1577743158.536:25): pid=9195 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 67.941920][ T27] audit: type=1800 audit(1577743158.536:26): pid=9195 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 67.993613][ T27] audit: type=1800 audit(1577743158.536:27): pid=9195 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 '10.128.0.201' (ECDSA) to the list of known hosts. syzkaller login: [ 77.551255][ T9356] IPVS: ftp: loaded support on port[0] = 21 [ 77.551271][ T9357] IPVS: ftp: loaded support on port[0] = 21 [ 77.567775][ T9352] IPVS: ftp: loaded support on port[0] = 21 [ 77.579118][ T9358] IPVS: ftp: loaded support on port[0] = 21 [ 77.579179][ T9354] IPVS: ftp: loaded support on port[0] = 21 [ 77.593939][ T9355] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 83.073455][ T3024] ------------[ cut here ]------------ [ 83.079397][ T3024] WARNING: CPU: 0 PID: 3024 at fs/ext4/inode.c:3562 ext4_set_page_dirty+0x34d/0x480 [ 83.088957][ T3024] Kernel panic - not syncing: panic_on_warn set ... [ 83.095565][ T3024] CPU: 0 PID: 3024 Comm: kworker/0:2 Not tainted 5.5.0-rc2-next-20191220-syzkaller #0 [ 83.105201][ T3024] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 83.115540][ T3024] Workqueue: events xdp_umem_release_deferred [ 83.121745][ T3024] Call Trace: [ 83.125051][ T3024] dump_stack+0x197/0x210 [ 83.129407][ T3024] ? ext4_set_page_dirty+0x2a0/0x480 [ 83.134836][ T3024] panic+0x2e3/0x75c [ 83.138909][ T3024] ? add_taint.cold+0x16/0x16 [ 83.143739][ T3024] ? printk+0xba/0xed [ 83.147776][ T3024] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 83.153253][ T3024] ? __warn.cold+0x14/0x3e [ 83.157963][ T3024] ? __warn+0xd9/0x1cf [ 83.162051][ T3024] ? ext4_set_page_dirty+0x34d/0x480 [ 83.167494][ T3024] __warn.cold+0x2f/0x3e [ 83.171750][ T3024] ? report_bug.cold+0x63/0xb2 [ 83.176806][ T3024] ? ext4_set_page_dirty+0x34d/0x480 [ 83.182207][ T3024] report_bug+0x289/0x300 [ 83.186680][ T3024] do_error_trap+0x11b/0x200 [ 83.191296][ T3024] do_invalid_op+0x37/0x50 [ 83.195848][ T3024] ? ext4_set_page_dirty+0x34d/0x480 [ 83.201240][ T3024] invalid_op+0x23/0x30 [ 83.205558][ T3024] RIP: 0010:ext4_set_page_dirty+0x34d/0x480 [ 83.211606][ T3024] Code: ff e8 07 e8 71 ff 49 8d 5f ff e9 a3 fd ff ff e8 f9 e7 71 ff 48 c7 c6 e0 61 3c 88 4c 89 e7 e8 2a cc 9d ff 0f 0b e8 e3 e7 71 ff <0f> 0b e9 56 ff ff ff e8 d7 e7 71 ff 4c 89 ea 48 b8 00 00 00 00 00 [ 83.231463][ T3024] RSP: 0018:ffffc90008317be8 EFLAGS: 00010293 [ 83.237677][ T3024] RAX: ffff88809ef32200 RBX: 0000000000000000 RCX: ffffffff82036d02 [ 83.245666][ T3024] RDX: 0000000000000000 RSI: ffffffff82036dad RDI: 0000000000000001 [ 83.253652][ T3024] RBP: ffffc90008317c10 R08: ffff88809ef32200 R09: fffff9400044cfa1 [ 83.261721][ T3024] R10: fffff9400044cfa0 R11: ffffea0002267d07 R12: ffffea0002267d00 [ 83.269738][ T3024] R13: ffffea0002267d08 R14: 0000000000000000 R15: ffffea00023adc48 [ 83.277746][ T3024] ? ext4_set_page_dirty+0x2a2/0x480 [ 83.283045][ T3024] ? ext4_set_page_dirty+0x34d/0x480 [ 83.288348][ T3024] ? ext4_set_page_dirty+0x34d/0x480 [ 83.293664][ T3024] ? put_page+0x220/0x220 [ 83.298014][ T3024] set_page_dirty+0x301/0x850 [ 83.302884][ T3024] set_page_dirty_lock+0x99/0xe0 [ 83.307845][ T3024] put_user_pages_dirty_lock+0x2a4/0x740 [ 83.313606][ T3024] xdp_umem_unpin_pages.isra.0+0x3d/0xb0 [ 83.319251][ T3024] ? xsk_reuseq_destroy+0x39/0x80 [ 83.324292][ T3024] xdp_umem_release_deferred+0x155/0x210 [ 83.329949][ T3024] process_one_work+0x9af/0x1740 [ 83.334908][ T3024] ? pwq_dec_nr_in_flight+0x320/0x320 [ 83.340295][ T3024] ? lock_acquire+0x190/0x410 [ 83.344996][ T3024] worker_thread+0x98/0xe40 [ 83.349542][ T3024] ? trace_hardirqs_on+0x67/0x240 [ 83.354591][ T3024] kthread+0x361/0x430 [ 83.358678][ T3024] ? process_one_work+0x1740/0x1740 [ 83.363890][ T3024] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 83.369745][ T3024] ret_from_fork+0x24/0x30 [ 83.375754][ T3024] Kernel Offset: disabled [ 83.380146][ T3024] Rebooting in 86400 seconds..