[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 61.511541][ T26] audit: type=1800 audit(1581634881.439:25): pid=8867 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 61.530760][ T26] audit: type=1800 audit(1581634881.439:26): pid=8867 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 61.550861][ T26] audit: type=1800 audit(1581634881.439:27): pid=8867 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 '10.128.10.39' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 74.369156][ T9021] IPVS: ftp: loaded support on port[0] = 21 [ 74.415898][ T9021] BUG: unable to handle page fault for address: ffff887f8f5fcfff [ 74.423661][ T9021] #PF: supervisor read access in kernel mode [ 74.429629][ T9021] #PF: error_code(0x0000) - not-present page [ 74.435605][ T9021] PGD 0 P4D 0 [ 74.438964][ T9021] Oops: 0000 [#1] PREEMPT SMP KASAN [ 74.444145][ T9021] CPU: 1 PID: 9021 Comm: syz-executor512 Not tainted 5.6.0-rc1-syzkaller #0 [ 74.452800][ T9021] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.462852][ T9021] RIP: 0010:netif_receive_generic_xdp+0x566/0x11d0 [ 74.469374][ T9021] Code: 74 08 48 89 df e8 ba f3 49 fb 4c 89 33 48 8b 9d 60 ff ff ff 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 fa f2 49 fb <48> 8b 33 83 e6 01 31 ff 48 89 b5 f0 fe ff ff e8 f6 d0 0c fb 48 89 [ 74.488976][ T9021] RSP: 0018:ffffc90002017958 EFLAGS: 00010246 [ 74.495083][ T9021] RAX: 1ffff10ff1ebf9ff RBX: ffff887f8f5fcfff RCX: 0000000000000100 [ 74.503037][ T9021] RDX: ffff888098fff9f0 RSI: 0000000000000000 RDI: ffffc90002017a88 [ 74.511158][ T9021] RBP: ffffc90002017a78 R08: ffffffff866a3083 R09: ffffed1011ebda5d [ 74.519119][ T9021] R10: ffffed1011ebda5d R11: 0000000000000000 R12: ffff888098fffa48 [ 74.527310][ T9021] R13: ffff888098fff980 R14: ffff88808f5ed000 R15: dffffc0000000000 [ 74.535268][ T9021] FS: 00000000020ac880(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 [ 74.544184][ T9021] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 74.551142][ T9021] CR2: ffff887f8f5fcfff CR3: 0000000091f7e000 CR4: 00000000001406e0 [ 74.559174][ T9021] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 74.567134][ T9021] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 74.575094][ T9021] Call Trace: [ 74.578384][ T9021] do_xdp_generic+0x39/0x110 [ 74.583080][ T9021] tun_get_user+0x1d9d/0x37d0 [ 74.587795][ T9021] ? rcu_lock_release+0x21/0x30 [ 74.592634][ T9021] tun_chr_write_iter+0xac/0x130 [ 74.597554][ T9021] do_iter_readv_writev+0x651/0x8e0 [ 74.602746][ T9021] do_iter_write+0x180/0x590 [ 74.607317][ T9021] ? import_iovec+0x122/0x2a0 [ 74.611978][ T9021] do_writev+0x239/0x490 [ 74.616264][ T9021] ? prepare_exit_to_usermode+0x221/0x5b0 [ 74.621969][ T9021] ? check_preemption_disabled+0xb4/0x260 [ 74.627685][ T9021] ? trace_irq_disable_rcuidle+0x23/0x1e0 [ 74.633395][ T9021] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 74.638958][ T9021] ? trace_irq_disable_rcuidle+0x23/0x1e0 [ 74.644665][ T9021] ? do_syscall_64+0x1d/0x1c0 [ 74.649325][ T9021] __x64_sys_writev+0x7d/0x90 [ 74.653990][ T9021] do_syscall_64+0xf7/0x1c0 [ 74.658614][ T9021] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 74.664490][ T9021] RIP: 0033:0x4418c0 [ 74.668359][ T9021] 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 97 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 [ 74.687949][ T9021] RSP: 002b:00007ffe6d2c1158 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 [ 74.696342][ T9021] RAX: ffffffffffffffda RBX: 00007ffe6d2c1170 RCX: 00000000004418c0 [ 74.704310][ T9021] RDX: 0000000000000001 RSI: 00007ffe6d2c11a0 RDI: 00000000000000f0 [ 74.712272][ T9021] RBP: 0000000000000003 R08: 00000000bb1414ac R09: 00000000bb1414ac [ 74.720232][ T9021] R10: 00000000bb1414ac R11: 0000000000000246 R12: 0000000000000000 [ 74.728317][ T9021] R13: 0000000000402cb0 R14: 0000000000000000 R15: 0000000000000000 [ 74.736289][ T9021] Modules linked in: [ 74.740177][ T9021] CR2: ffff887f8f5fcfff [ 74.744317][ T9021] ---[ end trace 88256e55b696f638 ]--- [ 74.749782][ T9021] RIP: 0010:netif_receive_generic_xdp+0x566/0x11d0 [ 74.756267][ T9021] Code: 74 08 48 89 df e8 ba f3 49 fb 4c 89 33 48 8b 9d 60 ff ff ff 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 fa f2 49 fb <48> 8b 33 83 e6 01 31 ff 48 89 b5 f0 fe ff ff e8 f6 d0 0c fb 48 89 [ 74.775853][ T9021] RSP: 0018:ffffc90002017958 EFLAGS: 00010246 [ 74.781905][ T9021] RAX: 1ffff10ff1ebf9ff RBX: ffff887f8f5fcfff RCX: 0000000000000100 [ 74.789859][ T9021] RDX: ffff888098fff9f0 RSI: 0000000000000000 RDI: ffffc90002017a88 [ 74.797821][ T9021] RBP: ffffc90002017a78 R08: ffffffff866a3083 R09: ffffed1011ebda5d [ 74.805845][ T9021] R10: ffffed1011ebda5d R11: 0000000000000000 R12: ffff888098fffa48 [ 74.813850][ T9021] R13: ffff888098fff980 R14: ffff88808f5ed000 R15: dffffc0000000000 [ 74.821809][ T9021] FS: 00000000020ac880(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 [ 74.830717][ T9021] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 74.837280][ T9021] CR2: ffff887f8f5fcfff CR3: 0000000091f7e000 CR4: 00000000001406e0 [ 74.845293][ T9021] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 74.853250][ T9021] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 74.861207][ T9021] Kernel panic - not syncing: Fatal exception in interrupt [ 74.869934][ T9021] Kernel Offset: disabled [ 74.874265][ T9021] Rebooting in 86400 seconds..