[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 51.719638][ T27] audit: type=1800 audit(1581257199.776:25): pid=8557 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 51.750673][ T27] audit: type=1800 audit(1581257199.786:26): pid=8557 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 51.785585][ T27] audit: type=1800 audit(1581257199.786:27): pid=8557 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 '10.128.0.92' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 64.120501][ T8710] IPVS: ftp: loaded support on port[0] = 21 [ 64.163257][ T8710] BUG: unable to handle page fault for address: ffff887f9fec7fff [ 64.171344][ T8710] #PF: supervisor read access in kernel mode [ 64.177313][ T8710] #PF: error_code(0x0000) - not-present page [ 64.183588][ T8710] PGD 0 P4D 0 [ 64.186960][ T8710] Oops: 0000 [#1] PREEMPT SMP KASAN [ 64.192238][ T8710] CPU: 0 PID: 8710 Comm: syz-executor069 Not tainted 5.5.0-syzkaller #0 [ 64.200559][ T8710] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.210800][ T8710] RIP: 0010:netif_receive_generic_xdp+0x566/0x11d0 [ 64.217386][ T8710] Code: 74 08 48 89 df e8 0a 63 4a 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 4a 62 4a fb <48> 8b 33 83 e6 01 31 ff 48 89 b5 f0 fe ff ff e8 86 3f 0d fb 48 89 [ 64.237118][ T8710] RSP: 0018:ffffc90002167958 EFLAGS: 00010246 [ 64.243204][ T8710] RAX: 1ffff10ff3fd8fff RBX: ffff887f9fec7fff RCX: 0000000000000100 [ 64.251919][ T8710] RDX: ffff88808c8bfef0 RSI: 0000000000000000 RDI: ffffc90002167a88 [ 64.260078][ T8710] RBP: ffffc90002167a78 R08: ffffffff8669c083 R09: ffffed1013fd705d [ 64.268248][ T8710] R10: ffffed1013fd705d R11: 0000000000000000 R12: ffff88808c8bff48 [ 64.276212][ T8710] R13: ffff88808c8bfe80 R14: ffff88809feb8000 R15: dffffc0000000000 [ 64.284180][ T8710] FS: 0000000001f61880(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 [ 64.293094][ T8710] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 64.299698][ T8710] CR2: ffff887f9fec7fff CR3: 0000000094471000 CR4: 00000000001406f0 [ 64.307672][ T8710] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 64.315657][ T8710] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 64.323793][ T8710] Call Trace: [ 64.327102][ T8710] do_xdp_generic+0x39/0x110 [ 64.331736][ T8710] tun_get_user+0x1d9d/0x37d0 [ 64.336477][ T8710] ? rcu_lock_release+0x21/0x30 [ 64.341401][ T8710] tun_chr_write_iter+0xac/0x130 [ 64.346346][ T8710] do_iter_readv_writev+0x651/0x8e0 [ 64.351531][ T8710] do_iter_write+0x180/0x590 [ 64.356186][ T8710] ? import_iovec+0x122/0x2a0 [ 64.360977][ T8710] do_writev+0x239/0x490 [ 64.365368][ T8710] ? prepare_exit_to_usermode+0x221/0x5b0 [ 64.371074][ T8710] ? check_preemption_disabled+0xb4/0x260 [ 64.376783][ T8710] ? trace_irq_disable_rcuidle+0x23/0x1e0 [ 64.382492][ T8710] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 64.388296][ T8710] ? trace_irq_disable_rcuidle+0x23/0x1e0 [ 64.394007][ T8710] ? do_syscall_64+0x1d/0x1c0 [ 64.398675][ T8710] __x64_sys_writev+0x7d/0x90 [ 64.403686][ T8710] do_syscall_64+0xf7/0x1c0 [ 64.408182][ T8710] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 64.414116][ T8710] RIP: 0033:0x4416c0 [ 64.418076][ T8710] 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 [ 64.438645][ T8710] RSP: 002b:00007ffd342b5638 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 [ 64.447075][ T8710] RAX: ffffffffffffffda RBX: 00007ffd342b5650 RCX: 00000000004416c0 [ 64.455038][ T8710] RDX: 0000000000000001 RSI: 00007ffd342b5680 RDI: 00000000000000f0 [ 64.463050][ T8710] RBP: 0000000000000003 R08: 00000000bb1414ac R09: 00000000bb1414ac [ 64.471030][ T8710] R10: 00000000bb1414ac R11: 0000000000000246 R12: 0000000000000000 [ 64.478998][ T8710] R13: 0000000000402ab0 R14: 0000000000000000 R15: 0000000000000000 [ 64.487090][ T8710] Modules linked in: [ 64.490976][ T8710] CR2: ffff887f9fec7fff [ 64.495206][ T8710] ---[ end trace 9524b077d9f5f2cb ]--- [ 64.500788][ T8710] RIP: 0010:netif_receive_generic_xdp+0x566/0x11d0 [ 64.507273][ T8710] Code: 74 08 48 89 df e8 0a 63 4a 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 4a 62 4a fb <48> 8b 33 83 e6 01 31 ff 48 89 b5 f0 fe ff ff e8 86 3f 0d fb 48 89 [ 64.526936][ T8710] RSP: 0018:ffffc90002167958 EFLAGS: 00010246 [ 64.532988][ T8710] RAX: 1ffff10ff3fd8fff RBX: ffff887f9fec7fff RCX: 0000000000000100 [ 64.541162][ T8710] RDX: ffff88808c8bfef0 RSI: 0000000000000000 RDI: ffffc90002167a88 [ 64.549137][ T8710] RBP: ffffc90002167a78 R08: ffffffff8669c083 R09: ffffed1013fd705d [ 64.557090][ T8710] R10: ffffed1013fd705d R11: 0000000000000000 R12: ffff88808c8bff48 [ 64.565104][ T8710] R13: ffff88808c8bfe80 R14: ffff88809feb8000 R15: dffffc0000000000 [ 64.573069][ T8710] FS: 0000000001f61880(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 [ 64.582237][ T8710] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 64.588809][ T8710] CR2: ffff887f9fec7fff CR3: 0000000094471000 CR4: 00000000001406f0 [ 64.596771][ T8710] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 64.604774][ T8710] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 64.612775][ T8710] Kernel panic - not syncing: Fatal exception in interrupt [ 64.621374][ T8710] Kernel Offset: disabled [ 64.625759][ T8710] Rebooting in 86400 seconds..