[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 96.098497][ T27] audit: type=1800 audit(1581252012.546:25): pid=9705 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 96.128400][ T27] audit: type=1800 audit(1581252012.556:26): pid=9705 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 96.175394][ T27] audit: type=1800 audit(1581252012.556:27): pid=9705 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 '10.128.0.171' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 105.023699][ T9857] IPVS: ftp: loaded support on port[0] = 21 [ 105.072842][ T9857] BUG: unable to handle page fault for address: ffff887f98241fff [ 105.081073][ T9857] #PF: supervisor read access in kernel mode [ 105.087134][ T9857] #PF: error_code(0x0000) - not-present page [ 105.093302][ T9857] PGD 0 P4D 0 [ 105.096753][ T9857] Oops: 0000 [#1] PREEMPT SMP KASAN [ 105.102088][ T9857] CPU: 0 PID: 9857 Comm: syz-executor235 Not tainted 5.5.0-syzkaller #0 [ 105.110562][ T9857] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 105.121175][ T9857] RIP: 0010:do_xdp_generic.part.0+0x479/0x17a0 [ 105.127806][ T9857] 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 [ 105.149354][ T9857] RSP: 0018:ffffc90001fbf770 EFLAGS: 00010246 [ 105.155433][ T9857] RAX: dffffc0000000000 RBX: ffff888098232000 RCX: ffffffff0000feff [ 105.163676][ T9857] RDX: 1ffff10ff30483ff RSI: ffff888099c021f0 RDI: 0000000000000005 [ 105.171765][ T9857] RBP: ffffc90001fbf8b0 R08: ffff88808bd66600 R09: ffffed101304645d [ 105.180618][ T9857] R10: ffffed101304645c R11: ffff8880982322e3 R12: ffff887f98241fff [ 105.188858][ T9857] R13: 0000000000000100 R14: ffff888098241fff R15: ffff888099c02180 [ 105.196951][ T9857] FS: 0000000001ae0880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 105.206292][ T9857] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 105.213617][ T9857] CR2: ffff887f98241fff CR3: 0000000096b67000 CR4: 00000000001406f0 [ 105.221879][ T9857] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 105.230011][ T9857] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 105.238132][ T9857] Call Trace: [ 105.241757][ T9857] ? generic_xdp_tx+0x740/0x740 [ 105.246619][ T9857] ? rcu_read_lock_held+0x9c/0xb0 [ 105.252129][ T9857] do_xdp_generic+0x30/0x50 [ 105.256750][ T9857] tun_get_user+0x2bcd/0x4020 [ 105.261426][ T9857] ? __kasan_check_read+0x11/0x20 [ 105.266569][ T9857] ? aa_file_perm+0x617/0x1600 [ 105.271452][ T9857] ? tun_build_skb.isra.0+0x1480/0x1480 [ 105.277260][ T9857] ? rcu_read_lock_held+0x9c/0xb0 [ 105.282654][ T9857] ? __kasan_check_read+0x11/0x20 [ 105.287684][ T9857] tun_chr_write_iter+0xbd/0x156 [ 105.292930][ T9857] do_iter_readv_writev+0x5f8/0x8f0 [ 105.298314][ T9857] ? no_seek_end_llseek_size+0x70/0x70 [ 105.305643][ T9857] ? apparmor_file_permission+0x27/0x30 [ 105.311191][ T9857] ? rw_verify_area+0x126/0x360 [ 105.316823][ T9857] do_iter_write+0x184/0x610 [ 105.321501][ T9857] ? dup_iter+0x260/0x260 [ 105.326241][ T9857] ? sendmsg_copy_msghdr+0x70/0x70 [ 105.332224][ T9857] vfs_writev+0x1b3/0x2f0 [ 105.337062][ T9857] ? vfs_iter_write+0xb0/0xb0 [ 105.342670][ T9857] ? __do_sys_bpf+0x938/0x41e0 [ 105.348059][ T9857] ? __fget_light+0x1ad/0x270 [ 105.353204][ T9857] ? __fdget+0x1b/0x20 [ 105.357627][ T9857] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 105.364109][ T9857] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 105.370521][ T9857] ? __fget_light+0x1ad/0x270 [ 105.376467][ T9857] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 105.382868][ T9857] do_writev+0x15b/0x330 [ 105.387495][ T9857] ? vfs_writev+0x2f0/0x2f0 [ 105.392151][ T9857] ? do_syscall_64+0x26/0x790 [ 105.397466][ T9857] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 105.404093][ T9857] ? do_syscall_64+0x26/0x790 [ 105.409278][ T9857] __x64_sys_writev+0x75/0xb0 [ 105.414185][ T9857] do_syscall_64+0xfa/0x790 [ 105.420404][ T9857] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 105.427367][ T9857] RIP: 0033:0x4416c0 [ 105.431262][ T9857] 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 51 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 [ 105.454009][ T9857] RSP: 002b:00007ffd8b184908 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 [ 105.463085][ T9857] RAX: ffffffffffffffda RBX: 00007ffd8b184920 RCX: 00000000004416c0 [ 105.471873][ T9857] RDX: 0000000000000001 RSI: 00007ffd8b184950 RDI: 00000000000000f0 [ 105.480826][ T9857] RBP: 0000000000000003 R08: 00000000bb1414ac R09: 00000000bb1414ac [ 105.489709][ T9857] R10: 00000000bb1414ac R11: 0000000000000246 R12: 0000000000000000 [ 105.499619][ T9857] R13: 0000000000402ab0 R14: 0000000000000000 R15: 0000000000000000 [ 105.507602][ T9857] Modules linked in: [ 105.511992][ T9857] CR2: ffff887f98241fff [ 105.516449][ T9857] ---[ end trace 5737bfffa840251f ]--- [ 105.521915][ T9857] RIP: 0010:do_xdp_generic.part.0+0x479/0x17a0 [ 105.528389][ T9857] 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 [ 105.549123][ T9857] RSP: 0018:ffffc90001fbf770 EFLAGS: 00010246 [ 105.555323][ T9857] RAX: dffffc0000000000 RBX: ffff888098232000 RCX: ffffffff0000feff [ 105.563754][ T9857] RDX: 1ffff10ff30483ff RSI: ffff888099c021f0 RDI: 0000000000000005 [ 105.572408][ T9857] RBP: ffffc90001fbf8b0 R08: ffff88808bd66600 R09: ffffed101304645d [ 105.581104][ T9857] R10: ffffed101304645c R11: ffff8880982322e3 R12: ffff887f98241fff [ 105.589480][ T9857] R13: 0000000000000100 R14: ffff888098241fff R15: ffff888099c02180 [ 105.597887][ T9857] FS: 0000000001ae0880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 105.607393][ T9857] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 105.614447][ T9857] CR2: ffff887f98241fff CR3: 0000000096b67000 CR4: 00000000001406f0 [ 105.624041][ T9857] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 105.632899][ T9857] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 105.641363][ T9857] Kernel panic - not syncing: Fatal exception in interrupt [ 105.651421][ T9857] Kernel Offset: disabled [ 105.656274][ T9857] Rebooting in 86400 seconds..