[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 89.876548][ T27] audit: type=1800 audit(1580733309.808:25): pid=9510 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 89.896417][ T27] audit: type=1800 audit(1580733309.808:26): pid=9510 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 89.948197][ T27] audit: type=1800 audit(1580733309.808:27): pid=9510 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 '10.128.0.177' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 98.320796][ T9668] IPVS: ftp: loaded support on port[0] = 21 [ 98.368098][ T9668] BUG: unable to handle page fault for address: ffff887fa7534fff [ 98.375875][ T9668] #PF: supervisor read access in kernel mode [ 98.381862][ T9668] #PF: error_code(0x0000) - not-present page [ 98.387816][ T9668] PGD 0 P4D 0 [ 98.391171][ T9668] Oops: 0000 [#1] PREEMPT SMP KASAN [ 98.396367][ T9668] CPU: 1 PID: 9668 Comm: syz-executor508 Not tainted 5.5.0-syzkaller #0 [ 98.404727][ T9668] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 98.414776][ T9668] RIP: 0010:do_xdp_generic.part.0+0x479/0x17a0 [ 98.421069][ T9668] Code: 03 48 89 85 f0 fe ff ff 48 b8 00 00 00 00 00 fc ff df 4c 89 a5 78 ff ff ff 80 3c 02 00 48 89 8d c8 fe ff ff 0f 85 ac 10 00 00 <49> 8b 04 24 49 8d 7c 24 0c 48 ba 00 00 00 00 00 fc ff df 48 89 85 [ 98.440842][ T9668] RSP: 0018:ffffc900020f7770 EFLAGS: 00010246 [ 98.446895][ T9668] RAX: dffffc0000000000 RBX: ffff8880a7525000 RCX: ffffffff0000feff [ 98.454849][ T9668] RDX: 1ffff10ff4ea69ff RSI: ffff8880a6d52470 RDI: 0000000000000005 [ 98.462849][ T9668] RBP: ffffc900020f78b0 R08: ffff8880a49b4580 R09: ffffed1014ea4a5d [ 98.470802][ T9668] R10: ffffed1014ea4a5c R11: ffff8880a75252e3 R12: ffff887fa7534fff [ 98.478752][ T9668] R13: 0000000000000100 R14: ffff8880a7534fff R15: ffff8880a6d52400 [ 98.486706][ T9668] FS: 0000000000eac880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 98.495613][ T9668] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 98.502181][ T9668] CR2: ffff887fa7534fff CR3: 00000000946b6000 CR4: 00000000001406e0 [ 98.510181][ T9668] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 98.518181][ T9668] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 98.526132][ T9668] Call Trace: [ 98.529419][ T9668] ? generic_xdp_tx+0x740/0x740 [ 98.534266][ T9668] ? rcu_read_lock_held+0x9c/0xb0 [ 98.539292][ T9668] do_xdp_generic+0x30/0x50 [ 98.543775][ T9668] tun_get_user+0x2bcd/0x4020 [ 98.548435][ T9668] ? __kasan_check_read+0x11/0x20 [ 98.553482][ T9668] ? aa_file_perm+0x617/0x1600 [ 98.558265][ T9668] ? tun_build_skb.isra.0+0x1480/0x1480 [ 98.563839][ T9668] ? rcu_read_lock_held+0x9c/0xb0 [ 98.568856][ T9668] ? __kasan_check_read+0x11/0x20 [ 98.573871][ T9668] tun_chr_write_iter+0xbd/0x156 [ 98.578809][ T9668] do_iter_readv_writev+0x5f8/0x8f0 [ 98.584013][ T9668] ? no_seek_end_llseek_size+0x70/0x70 [ 98.589462][ T9668] ? apparmor_file_permission+0x27/0x30 [ 98.594998][ T9668] ? rw_verify_area+0x126/0x360 [ 98.599898][ T9668] do_iter_write+0x184/0x610 [ 98.604476][ T9668] ? dup_iter+0x260/0x260 [ 98.608786][ T9668] ? sendmsg_copy_msghdr+0x70/0x70 [ 98.613890][ T9668] vfs_writev+0x1b3/0x2f0 [ 98.618203][ T9668] ? vfs_iter_write+0xb0/0xb0 [ 98.622859][ T9668] ? __do_sys_bpf+0x938/0x41e0 [ 98.627613][ T9668] ? __fget_light+0x1ad/0x270 [ 98.632270][ T9668] ? __fdget+0x1b/0x20 [ 98.636326][ T9668] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 98.642564][ T9668] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 98.648784][ T9668] ? __fget_light+0x1ad/0x270 [ 98.653480][ T9668] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 98.659699][ T9668] do_writev+0x15b/0x330 [ 98.663921][ T9668] ? vfs_writev+0x2f0/0x2f0 [ 98.668408][ T9668] ? do_syscall_64+0x26/0x790 [ 98.673077][ T9668] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 98.679124][ T9668] ? do_syscall_64+0x26/0x790 [ 98.683793][ T9668] __x64_sys_writev+0x75/0xb0 [ 98.688465][ T9668] do_syscall_64+0xfa/0x790 [ 98.692959][ T9668] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 98.698934][ T9668] RIP: 0033:0x441660 [ 98.702812][ T9668] Code: 05 48 3d 01 f0 ff ff 0f 83 fd 0e fc ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 83 3d b1 99 29 00 00 75 14 b8 14 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 d4 0e fc ff c3 48 83 ec 08 e8 7a 2b 00 00 [ 98.722405][ T9668] RSP: 002b:00007ffdf7fbafb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 [ 98.730805][ T9668] RAX: ffffffffffffffda RBX: 00007ffdf7fbafd0 RCX: 0000000000441660 [ 98.738763][ T9668] RDX: 0000000000000001 RSI: 00007ffdf7fbb000 RDI: 00000000000000f0 [ 98.746716][ T9668] RBP: 0000000000000003 R08: 00000000bb1414ac R09: 00000000bb1414ac [ 98.754716][ T9668] R10: 00000000bb1414ac R11: 0000000000000246 R12: 0000000000000000 [ 98.762671][ T9668] R13: 0000000000402a50 R14: 0000000000000000 R15: 0000000000000000 [ 98.770633][ T9668] Modules linked in: [ 98.774511][ T9668] CR2: ffff887fa7534fff [ 98.778647][ T9668] ---[ end trace b2b6222f65974fc8 ]--- [ 98.784092][ T9668] RIP: 0010:do_xdp_generic.part.0+0x479/0x17a0 [ 98.790271][ T9668] Code: 03 48 89 85 f0 fe ff ff 48 b8 00 00 00 00 00 fc ff df 4c 89 a5 78 ff ff ff 80 3c 02 00 48 89 8d c8 fe ff ff 0f 85 ac 10 00 00 <49> 8b 04 24 49 8d 7c 24 0c 48 ba 00 00 00 00 00 fc ff df 48 89 85 [ 98.809860][ T9668] RSP: 0018:ffffc900020f7770 EFLAGS: 00010246 [ 98.815905][ T9668] RAX: dffffc0000000000 RBX: ffff8880a7525000 RCX: ffffffff0000feff [ 98.823859][ T9668] RDX: 1ffff10ff4ea69ff RSI: ffff8880a6d52470 RDI: 0000000000000005 [ 98.831853][ T9668] RBP: ffffc900020f78b0 R08: ffff8880a49b4580 R09: ffffed1014ea4a5d [ 98.839915][ T9668] R10: ffffed1014ea4a5c R11: ffff8880a75252e3 R12: ffff887fa7534fff [ 98.847885][ T9668] R13: 0000000000000100 R14: ffff8880a7534fff R15: ffff8880a6d52400 [ 98.855838][ T9668] FS: 0000000000eac880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 98.864745][ T9668] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 98.871308][ T9668] CR2: ffff887fa7534fff CR3: 00000000946b6000 CR4: 00000000001406e0 [ 98.879263][ T9668] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 98.887257][ T9668] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 98.895211][ T9668] Kernel panic - not syncing: Fatal exception in interrupt [ 98.904079][ T9668] Kernel Offset: disabled [ 98.908398][ T9668] Rebooting in 86400 seconds..