[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 56.538800][ T27] audit: type=1800 audit(1580985259.450:25): pid=8781 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 56.558268][ T27] audit: type=1800 audit(1580985259.450:26): pid=8781 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 56.578935][ T27] audit: type=1800 audit(1580985259.460:27): pid=8781 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 '10.128.0.71' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 67.479733][ T8934] IPVS: ftp: loaded support on port[0] = 21 [ 67.530047][ T8936] BUG: unable to handle page fault for address: ffff887f9f28f7ff [ 67.538039][ T8936] #PF: supervisor read access in kernel mode [ 67.544048][ T8936] #PF: error_code(0x0000) - not-present page [ 67.550005][ T8936] PGD 0 P4D 0 [ 67.553367][ T8936] Oops: 0000 [#1] PREEMPT SMP KASAN [ 67.558595][ T8936] CPU: 1 PID: 8936 Comm: syz-executor136 Not tainted 5.5.0-syzkaller #0 [ 67.566895][ T8936] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.576948][ T8936] RIP: 0010:netif_receive_generic_xdp+0x566/0x11d0 [ 67.583448][ T8936] Code: 74 08 48 89 df e8 ea bc 4b 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 2a bc 4b fb <48> 8b 33 83 e6 01 31 ff 48 89 b5 f0 fe ff ff e8 76 ad 0e fb 48 89 [ 67.607555][ T8936] RSP: 0018:ffffc90000f77958 EFLAGS: 00010246 [ 67.613644][ T8936] RAX: 1ffff10ff3e51eff RBX: ffff887f9f28f7ff RCX: 0000000000000100 [ 67.621770][ T8936] RDX: ffff8880a47618b0 RSI: 0000000000000000 RDI: ffffc90000f77a88 [ 67.629890][ T8936] RBP: ffffc90000f77a78 R08: ffffffff86682ee3 R09: ffffed1013e4ff5d [ 67.639241][ T8936] R10: ffffed1013e4ff5d R11: 0000000000000000 R12: ffff8880a4761908 [ 67.647511][ T8936] R13: ffff8880a4761840 R14: ffff88809f27f800 R15: dffffc0000000000 [ 67.656043][ T8936] FS: 000000000086f880(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 [ 67.665032][ T8936] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 67.671619][ T8936] CR2: ffff887f9f28f7ff CR3: 000000008e245000 CR4: 00000000001406e0 [ 67.679590][ T8936] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 67.687560][ T8936] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 67.695590][ T8936] Call Trace: [ 67.699060][ T8936] do_xdp_generic+0x39/0x110 [ 67.703638][ T8936] tun_get_user+0x1d9d/0x3790 [ 67.708399][ T8936] ? rcu_lock_release+0x21/0x30 [ 67.713284][ T8936] tun_chr_write_iter+0xac/0x130 [ 67.718504][ T8936] do_iter_readv_writev+0x651/0x8e0 [ 67.723857][ T8936] do_iter_write+0x180/0x590 [ 67.728436][ T8936] ? import_iovec+0x122/0x2a0 [ 67.733105][ T8936] do_writev+0x239/0x490 [ 67.737446][ T8936] ? check_preemption_disabled+0xb4/0x260 [ 67.743478][ T8936] ? debug_smp_processor_id+0x9/0x20 [ 67.748760][ T8936] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 67.754317][ T8936] ? trace_irq_disable_rcuidle+0x23/0x1e0 [ 67.760030][ T8936] ? do_syscall_64+0x1d/0x1c0 [ 67.764705][ T8936] __x64_sys_writev+0x7d/0x90 [ 67.769438][ T8936] do_syscall_64+0xf7/0x1c0 [ 67.773940][ T8936] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 67.779908][ T8936] RIP: 0033:0x4420c0 [ 67.783796][ T8936] Code: 05 48 3d 01 f0 ff ff 0f 83 5d 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 83 3d 51 8f 29 00 00 75 14 b8 14 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 34 09 fc ff c3 48 83 ec 08 e8 ba 2b 00 00 [ 67.803530][ T8936] RSP: 002b:00007fffbff1f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 [ 67.811929][ T8936] RAX: ffffffffffffffda RBX: 00007fffbff1f040 RCX: 00000000004420c0 [ 67.819922][ T8936] RDX: 0000000000000001 RSI: 00007fffbff1f070 RDI: 00000000000000f0 [ 67.827964][ T8936] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000004 [ 67.836115][ T8936] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000001078a [ 67.844205][ T8936] R13: 0000000000402f10 R14: 0000000000000000 R15: 0000000000000000 [ 67.852216][ T8936] Modules linked in: [ 67.856099][ T8936] CR2: ffff887f9f28f7ff [ 67.860248][ T8936] ---[ end trace 1a71d07a2a1c44ac ]--- [ 67.865929][ T8936] RIP: 0010:netif_receive_generic_xdp+0x566/0x11d0 [ 67.872449][ T8936] Code: 74 08 48 89 df e8 ea bc 4b 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 2a bc 4b fb <48> 8b 33 83 e6 01 31 ff 48 89 b5 f0 fe ff ff e8 76 ad 0e fb 48 89 [ 67.892045][ T8936] RSP: 0018:ffffc90000f77958 EFLAGS: 00010246 [ 67.898220][ T8936] RAX: 1ffff10ff3e51eff RBX: ffff887f9f28f7ff RCX: 0000000000000100 [ 67.906182][ T8936] RDX: ffff8880a47618b0 RSI: 0000000000000000 RDI: ffffc90000f77a88 [ 67.914271][ T8936] RBP: ffffc90000f77a78 R08: ffffffff86682ee3 R09: ffffed1013e4ff5d [ 67.922240][ T8936] R10: ffffed1013e4ff5d R11: 0000000000000000 R12: ffff8880a4761908 [ 67.930328][ T8936] R13: ffff8880a4761840 R14: ffff88809f27f800 R15: dffffc0000000000 [ 67.938505][ T8936] FS: 000000000086f880(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 [ 67.947441][ T8936] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 67.954017][ T8936] CR2: ffff887f9f28f7ff CR3: 000000008e245000 CR4: 00000000001406e0 [ 67.962108][ T8936] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 67.970188][ T8936] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 67.978169][ T8936] Kernel panic - not syncing: Fatal exception in interrupt [ 67.986712][ T8936] Kernel Offset: disabled [ 67.991050][ T8936] Rebooting in 86400 seconds..