[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 91.397774][ T26] audit: type=1800 audit(1581749438.243:25): pid=9527 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 91.417770][ T26] audit: type=1800 audit(1581749438.243:26): pid=9527 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 91.454152][ T26] audit: type=1800 audit(1581749438.243:27): pid=9527 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 '10.128.0.18' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 99.633413][ T9680] IPVS: ftp: loaded support on port[0] = 21 [ 99.676380][ T9680] BUG: unable to handle page fault for address: ffff887f958d5fff [ 99.684123][ T9680] #PF: supervisor read access in kernel mode [ 99.690180][ T9680] #PF: error_code(0x0000) - not-present page [ 99.696127][ T9680] PGD 0 P4D 0 [ 99.699474][ T9680] Oops: 0000 [#1] PREEMPT SMP KASAN [ 99.704643][ T9680] CPU: 0 PID: 9680 Comm: syz-executor647 Not tainted 5.6.0-rc1-syzkaller #0 [ 99.713284][ T9680] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 99.723322][ T9680] RIP: 0010:do_xdp_generic.part.0+0x499/0x18e0 [ 99.729447][ T9680] Code: ff 48 c1 ea 03 48 89 85 e8 fe ff ff 4c 89 f8 4c 29 f0 48 89 45 80 48 b8 00 00 00 00 00 fc ff df 80 3c 02 00 0f 85 9c 11 00 00 <48> 8b 03 48 8d 7b 0c 48 ba 00 00 00 00 00 fc ff df 48 89 85 d8 fe [ 99.749060][ T9680] RSP: 0018:ffffc90001ff7770 EFLAGS: 00010246 [ 99.755098][ T9680] RAX: dffffc0000000000 RBX: ffff887f958d5fff RCX: 00000000ffff0101 [ 99.763058][ T9680] RDX: 1ffff10ff2b1abff RSI: ffffffff863975b0 RDI: 0000000000000005 [ 99.771111][ T9680] RBP: ffffc90001ff78b0 R08: ffff8880a8c96040 R09: ffffed1012b18c5d [ 99.779058][ T9680] R10: ffffed1012b18c5c R11: ffff8880958c62e3 R12: ffff8880a80a5900 [ 99.787002][ T9680] R13: 0000000000000000 R14: 0000000000000100 R15: ffff8880958c6100 [ 99.794951][ T9680] FS: 0000000000d29880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 99.803889][ T9680] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 99.810445][ T9680] CR2: ffff887f958d5fff CR3: 0000000090595000 CR4: 00000000001406f0 [ 99.818412][ T9680] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 99.826357][ T9680] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 99.834302][ T9680] Call Trace: [ 99.837592][ T9680] ? generic_xdp_tx+0x740/0x740 [ 99.842421][ T9680] ? rcu_read_lock_held+0x9c/0xb0 [ 99.847440][ T9680] do_xdp_generic+0x30/0x50 [ 99.851917][ T9680] tun_get_user+0x2bcd/0x4020 [ 99.856569][ T9680] ? __kasan_check_read+0x11/0x20 [ 99.861566][ T9680] ? aa_file_perm+0x617/0x1600 [ 99.866307][ T9680] ? tun_build_skb.isra.0+0x1480/0x1480 [ 99.871829][ T9680] ? rcu_read_lock_held+0x9c/0xb0 [ 99.876850][ T9680] ? __kasan_check_read+0x11/0x20 [ 99.881871][ T9680] tun_chr_write_iter+0xbd/0x156 [ 99.886808][ T9680] do_iter_readv_writev+0x5f8/0x8f0 [ 99.891995][ T9680] ? no_seek_end_llseek_size+0x70/0x70 [ 99.897432][ T9680] ? apparmor_file_permission+0x27/0x30 [ 99.902956][ T9680] ? rw_verify_area+0x126/0x360 [ 99.907782][ T9680] do_iter_write+0x184/0x610 [ 99.912344][ T9680] ? dup_iter+0x260/0x260 [ 99.916755][ T9680] ? sendmsg_copy_msghdr+0x70/0x70 [ 99.921856][ T9680] vfs_writev+0x1b3/0x2f0 [ 99.926271][ T9680] ? vfs_iter_write+0xb0/0xb0 [ 99.931043][ T9680] ? __do_sys_bpf+0x938/0x41e0 [ 99.935796][ T9680] ? __fget_light+0x1ad/0x270 [ 99.940448][ T9680] ? __fdget+0x1b/0x20 [ 99.944490][ T9680] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 99.950718][ T9680] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 99.956934][ T9680] ? __fget_light+0x1ad/0x270 [ 99.961588][ T9680] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 99.967804][ T9680] do_writev+0x15b/0x330 [ 99.972020][ T9680] ? vfs_writev+0x2f0/0x2f0 [ 99.976500][ T9680] ? do_syscall_64+0x26/0x790 [ 99.981150][ T9680] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 99.987195][ T9680] ? do_syscall_64+0x26/0x790 [ 99.991846][ T9680] __x64_sys_writev+0x75/0xb0 [ 99.996497][ T9680] do_syscall_64+0xfa/0x790 [ 100.000976][ T9680] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 100.006842][ T9680] RIP: 0033:0x4416b0 [ 100.010710][ T9680] 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 61 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 [ 100.030283][ T9680] RSP: 002b:00007ffda7e2b758 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 [ 100.038669][ T9680] RAX: ffffffffffffffda RBX: 00007ffda7e2b770 RCX: 00000000004416b0 [ 100.046615][ T9680] RDX: 0000000000000001 RSI: 00007ffda7e2b7a0 RDI: 00000000000000f0 [ 100.054571][ T9680] RBP: 0000000000000003 R08: 00000000bb1414ac R09: 00000000bb1414ac [ 100.062518][ T9680] R10: 00000000bb1414ac R11: 0000000000000246 R12: 0000000000000000 [ 100.070466][ T9680] R13: 0000000000402aa0 R14: 0000000000000000 R15: 0000000000000000 [ 100.078424][ T9680] Modules linked in: [ 100.082295][ T9680] CR2: ffff887f958d5fff [ 100.086461][ T9680] ---[ end trace 0d9c0936748b4b56 ]--- [ 100.091902][ T9680] RIP: 0010:do_xdp_generic.part.0+0x499/0x18e0 [ 100.098037][ T9680] Code: ff 48 c1 ea 03 48 89 85 e8 fe ff ff 4c 89 f8 4c 29 f0 48 89 45 80 48 b8 00 00 00 00 00 fc ff df 80 3c 02 00 0f 85 9c 11 00 00 <48> 8b 03 48 8d 7b 0c 48 ba 00 00 00 00 00 fc ff df 48 89 85 d8 fe [ 100.117622][ T9680] RSP: 0018:ffffc90001ff7770 EFLAGS: 00010246 [ 100.123756][ T9680] RAX: dffffc0000000000 RBX: ffff887f958d5fff RCX: 00000000ffff0101 [ 100.131702][ T9680] RDX: 1ffff10ff2b1abff RSI: ffffffff863975b0 RDI: 0000000000000005 [ 100.139652][ T9680] RBP: ffffc90001ff78b0 R08: ffff8880a8c96040 R09: ffffed1012b18c5d [ 100.147602][ T9680] R10: ffffed1012b18c5c R11: ffff8880958c62e3 R12: ffff8880a80a5900 [ 100.155555][ T9680] R13: 0000000000000000 R14: 0000000000000100 R15: ffff8880958c6100 [ 100.163548][ T9680] FS: 0000000000d29880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 100.172448][ T9680] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 100.179048][ T9680] CR2: ffff887f958d5fff CR3: 0000000090595000 CR4: 00000000001406f0 [ 100.187025][ T9680] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 100.194983][ T9680] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 100.202943][ T9680] Kernel panic - not syncing: Fatal exception in interrupt [ 100.211359][ T9680] Kernel Offset: disabled [ 100.215693][ T9680] Rebooting in 86400 seconds..