[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 52.301023][ T23] audit: type=1800 audit(1579438861.875:25): pid=8402 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 52.320349][ T23] audit: type=1800 audit(1579438861.885:26): pid=8402 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 52.339753][ T23] audit: type=1800 audit(1579438861.885:27): pid=8402 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 '10.128.0.54' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 61.366193][ T8553] IPVS: ftp: loaded support on port[0] = 21 [ 61.405830][ T8553] netlink: 'syz-executor167': attribute type 1 has an invalid length. [ 61.414124][ T8553] netlink: 'syz-executor167': attribute type 1 has an invalid length. [ 61.422359][ T8553] netlink: 'syz-executor167': attribute type 1 has an invalid length. [ 61.431057][ T8553] netlink: 'syz-executor167': attribute type 1 has an invalid length. [ 61.439293][ T8553] netlink: 'syz-executor167': attribute type 1 has an invalid length. [ 61.447625][ T8553] netlink: 'syz-executor167': attribute type 1 has an invalid length. [ 61.455814][ T8553] netlink: 'syz-executor167': attribute type 1 has an invalid length. [ 61.463955][ T8553] netlink: 'syz-executor167': attribute type 1 has an invalid length. [ 61.472183][ T8553] netlink: 'syz-executor167': attribute type 1 has an invalid length. [ 61.480348][ T8553] netlink: 'syz-executor167': attribute type 1 has an invalid length. [ 61.489022][ T8553] BUG: unable to handle page fault for address: ffff887f9e63c7ff [ 61.496768][ T8553] #PF: supervisor read access in kernel mode [ 61.502729][ T8553] #PF: error_code(0x0000) - not-present page [ 61.508678][ T8553] PGD 0 P4D 0 [ 61.512025][ T8553] Oops: 0000 [#1] PREEMPT SMP KASAN [ 61.517195][ T8553] CPU: 1 PID: 8553 Comm: syz-executor167 Not tainted 5.5.0-rc6-syzkaller #0 [ 61.525887][ T8553] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.535926][ T8553] RIP: 0010:netif_receive_generic_xdp+0x56c/0x11b0 [ 61.542397][ T8553] Code: 74 08 48 89 df e8 d4 3f 60 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 14 3f 60 fb <48> 8b 33 83 e6 01 31 ff 48 89 b5 f0 fe ff ff e8 80 00 24 fb 48 89 [ 61.562011][ T8553] RSP: 0018:ffffc90002007958 EFLAGS: 00010246 [ 61.568049][ T8553] RAX: 1ffff10ff3cc78ff RBX: ffff887f9e63c7ff RCX: 0000000000000100 [ 61.575995][ T8553] RDX: ffff8880a29f1db0 RSI: 0000000000000000 RDI: ffffc90002007a88 [ 61.583940][ T8553] RBP: ffffc90002007a78 R08: ffffffff86527ef6 R09: ffffed1013cc595d [ 61.591888][ T8553] R10: ffffed1013cc595d R11: 0000000000000000 R12: ffff8880a29f1e08 [ 61.599847][ T8553] R13: ffff8880a29f1d40 R14: ffff88809e62c800 R15: dffffc0000000000 [ 61.607801][ T8553] FS: 0000000000fc6880(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000 [ 61.616704][ T8553] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 61.623272][ T8553] CR2: ffff887f9e63c7ff CR3: 000000008c35f000 CR4: 00000000001406e0 [ 61.631227][ T8553] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 61.639191][ T8553] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 61.647134][ T8553] Call Trace: [ 61.650410][ T8553] do_xdp_generic+0x39/0x110 [ 61.654978][ T8553] tun_get_user+0x1dfb/0x37b0 [ 61.659631][ T8553] ? rcu_lock_release+0x21/0x30 [ 61.664452][ T8553] tun_chr_write_iter+0xac/0x130 [ 61.669362][ T8553] do_iter_readv_writev+0x651/0x8e0 [ 61.674548][ T8553] do_iter_write+0x180/0x590 [ 61.679125][ T8553] ? import_iovec+0x122/0x2a0 [ 61.683790][ T8553] do_writev+0x239/0x490 [ 61.688023][ T8553] ? prepare_exit_to_usermode+0x221/0x5b0 [ 61.693768][ T8553] ? trace_irq_disable_rcuidle+0x23/0x1e0 [ 61.699512][ T8553] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 61.704945][ T8553] ? trace_irq_disable_rcuidle+0x23/0x1e0 [ 61.710637][ T8553] ? do_syscall_64+0x1d/0x1c0 [ 61.715333][ T8553] __x64_sys_writev+0x7d/0x90 [ 61.719983][ T8553] do_syscall_64+0xf7/0x1c0 [ 61.724499][ T8553] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 61.730406][ T8553] RIP: 0033:0x441a80 [ 61.734272][ T8553] 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 b1 95 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 [ 61.753855][ T8553] RSP: 002b:00007ffd8b92a5f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 [ 61.762257][ T8553] RAX: ffffffffffffffda RBX: 00007ffd8b92a610 RCX: 0000000000441a80 [ 61.770252][ T8553] RDX: 0000000000000001 RSI: 00007ffd8b92a640 RDI: 00000000000000f0 [ 61.778198][ T8553] RBP: 0000000000000003 R08: 00000000bb1414ac R09: 00000000bb1414ac [ 61.786146][ T8553] R10: 00000000bb1414ac R11: 0000000000000246 R12: 0000000000000000 [ 61.794112][ T8553] R13: 0000000000402e70 R14: 0000000000000000 R15: 0000000000000000 [ 61.802064][ T8553] Modules linked in: [ 61.805932][ T8553] CR2: ffff887f9e63c7ff [ 61.810064][ T8553] ---[ end trace 57c0a27b8fde52c4 ]--- [ 61.815507][ T8553] RIP: 0010:netif_receive_generic_xdp+0x56c/0x11b0 [ 61.821981][ T8553] Code: 74 08 48 89 df e8 d4 3f 60 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 14 3f 60 fb <48> 8b 33 83 e6 01 31 ff 48 89 b5 f0 fe ff ff e8 80 00 24 fb 48 89 [ 61.841574][ T8553] RSP: 0018:ffffc90002007958 EFLAGS: 00010246 [ 61.847610][ T8553] RAX: 1ffff10ff3cc78ff RBX: ffff887f9e63c7ff RCX: 0000000000000100 [ 61.855570][ T8553] RDX: ffff8880a29f1db0 RSI: 0000000000000000 RDI: ffffc90002007a88 [ 61.863526][ T8553] RBP: ffffc90002007a78 R08: ffffffff86527ef6 R09: ffffed1013cc595d [ 61.871483][ T8553] R10: ffffed1013cc595d R11: 0000000000000000 R12: ffff8880a29f1e08 [ 61.879431][ T8553] R13: ffff8880a29f1d40 R14: ffff88809e62c800 R15: dffffc0000000000 [ 61.887378][ T8553] FS: 0000000000fc6880(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000 [ 61.896281][ T8553] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 61.902876][ T8553] CR2: ffff887f9e63c7ff CR3: 000000008c35f000 CR4: 00000000001406e0 [ 61.910873][ T8553] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 61.918832][ T8553] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 61.926859][ T8553] Kernel panic - not syncing: Fatal exception in interrupt [ 61.935217][ T8553] Kernel Offset: disabled [ 61.939552][ T8553] Rebooting in 86400 seconds..