[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 54.728881][ T26] audit: type=1800 audit(1566641129.692:25): pid=8530 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 54.750587][ T26] audit: type=1800 audit(1566641129.692:26): pid=8530 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 54.784374][ T26] audit: type=1800 audit(1566641129.702:27): pid=8530 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 '10.128.0.16' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 62.925724][ T8684] IPVS: ftp: loaded support on port[0] = 21 [ 62.983892][ T8692] ------------[ cut here ]------------ [ 62.989429][ T8692] kernel BUG at include/linux/skbuff.h:2233! [ 62.995443][ T8692] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 63.001495][ T8692] CPU: 1 PID: 8692 Comm: syz-executor182 Not tainted 5.3.0-rc5-next-20190823 #72 [ 63.010585][ T8692] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.020768][ T8692] RIP: 0010:skb_pull+0xea/0x110 [ 63.025597][ T8692] Code: 9d c8 00 00 00 49 89 dc 49 89 9d c8 00 00 00 e8 5c 37 d9 fb 4c 89 e0 5b 41 5c 41 5d 41 5e 5d c3 45 31 e4 eb ea e8 46 37 d9 fb <0f> 0b e8 ff 28 14 fc e9 44 ff ff ff e8 f5 28 14 fc eb 8a e8 0e 29 [ 63.045187][ T8692] RSP: 0018:ffff888093596e50 EFLAGS: 00010293 [ 63.051228][ T8692] RAX: ffff888090162140 RBX: 0000000000000004 RCX: ffffffff859913e6 [ 63.059173][ T8692] RDX: 0000000000000000 RSI: ffffffff8599143a RDI: 0000000000000004 [ 63.067123][ T8692] RBP: ffff888093596e70 R08: ffff888090162140 R09: fffffbfff14efb33 [ 63.075074][ T8692] R10: fffffbfff14efb32 R11: ffffffff8a77d997 R12: 0000000094a0ac0c [ 63.083023][ T8692] R13: ffff8880935974c0 R14: 00000000ffff8880 R15: ffff8880935974c0 [ 63.090969][ T8692] FS: 0000555556fd4880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 63.099869][ T8692] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 63.106429][ T8692] CR2: 0000000020000040 CR3: 000000008703d000 CR4: 00000000001406e0 [ 63.114386][ T8692] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 63.122341][ T8692] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 63.130284][ T8692] Call Trace: [ 63.133567][ T8692] ? __kasan_check_read+0x11/0x20 [ 63.138569][ T8692] sctp_inq_pop+0x2f1/0xd80 [ 63.143059][ T8692] sctp_endpoint_bh_rcv+0x184/0x8d0 [ 63.148235][ T8692] ? sctp_endpoint_lookup_assoc+0x290/0x290 [ 63.154106][ T8692] ? rwlock_bug.part.0+0x90/0x90 [ 63.159016][ T8692] ? lock_acquire+0x190/0x410 [ 63.163669][ T8692] sctp_inq_push+0x1e4/0x280 [ 63.168255][ T8692] sctp_rcv+0x2807/0x3590 [ 63.172561][ T8692] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 63.178777][ T8692] ? sctp_addrs_lookup_transport+0x7a0/0x7a0 [ 63.184731][ T8692] ? __kasan_check_read+0x11/0x20 [ 63.189732][ T8692] ? mark_lock+0xc2/0x1220 [ 63.194126][ T8692] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 63.200345][ T8692] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 63.206478][ T8692] ? rcu_read_lock_held+0x9c/0xb0 [ 63.211494][ T8692] sctp6_rcv+0x17/0x30 [ 63.215549][ T8692] ip6_protocol_deliver_rcu+0x2fe/0x1660 [ 63.221169][ T8692] ip6_input_finish+0x84/0x170 [ 63.225911][ T8692] ip6_input+0xe4/0x3f0 [ 63.230051][ T8692] ? ip6_input_finish+0x170/0x170 [ 63.235054][ T8692] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 63.241192][ T8692] ? ip6_protocol_deliver_rcu+0x1660/0x1660 [ 63.247062][ T8692] ? rcu_read_lock_held_common+0x130/0x130 [ 63.252844][ T8692] ip6_sublist_rcv_finish+0x98/0x1e0 [ 63.258105][ T8692] ip6_sublist_rcv+0x80c/0xcf0 [ 63.262863][ T8692] ? ip6_rcv_finish+0x2f0/0x2f0 [ 63.267699][ T8692] ? ip6_rcv_finish_core.isra.0+0x560/0x560 [ 63.273566][ T8692] ? ip6_rcv_core.isra.0+0x1011/0x1bb0 [ 63.279016][ T8692] ipv6_list_rcv+0x373/0x4b0 [ 63.283582][ T8692] ? __kasan_check_read+0x11/0x20 [ 63.288582][ T8692] ? ipv6_rcv+0x420/0x420 [ 63.292887][ T8692] ? __lock_acquire+0x8a1/0x4e70 [ 63.297806][ T8692] ? __kasan_check_read+0x11/0x20 [ 63.302811][ T8692] ? ipv6_rcv+0x420/0x420 [ 63.307134][ T8692] __netif_receive_skb_list_core+0x5fc/0x9d0 [ 63.313088][ T8692] ? ktime_get_with_offset+0x13a/0x350 [ 63.318526][ T8692] ? ktime_get_with_offset+0x13a/0x350 [ 63.323968][ T8692] ? process_backlog+0x750/0x750 [ 63.328883][ T8692] ? lock_acquire+0x190/0x410 [ 63.333534][ T8692] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 63.339747][ T8692] ? __kasan_check_read+0x11/0x20 [ 63.344749][ T8692] netif_receive_skb_list_internal+0x7eb/0xe60 [ 63.350878][ T8692] ? __netif_receive_skb_list_core+0x9d0/0x9d0 [ 63.357005][ T8692] ? __kasan_check_read+0x11/0x20 [ 63.362010][ T8692] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 63.368312][ T8692] ? eth_gro_receive+0x890/0x890 [ 63.373228][ T8692] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 63.379185][ T8692] gro_normal_list.part.0+0x1e/0xb0 [ 63.384368][ T8692] napi_gro_frags+0xa6a/0xea0 [ 63.389024][ T8692] tun_get_user+0x2e98/0x3fa0 [ 63.393678][ T8692] ? __kasan_check_read+0x11/0x20 [ 63.398677][ T8692] ? __lock_acquire+0x8a1/0x4e70 [ 63.403594][ T8692] ? tun_build_skb.isra.0+0x1390/0x1390 [ 63.409117][ T8692] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 63.415331][ T8692] ? __kasan_check_read+0x11/0x20 [ 63.420332][ T8692] tun_chr_write_iter+0xbd/0x156 [ 63.425265][ T8692] do_iter_readv_writev+0x5f8/0x8f0 [ 63.430446][ T8692] ? no_seek_end_llseek_size+0x70/0x70 [ 63.435881][ T8692] ? apparmor_file_permission+0x25/0x30 [ 63.441403][ T8692] ? rw_verify_area+0x126/0x360 [ 63.446226][ T8692] do_iter_write+0x17b/0x380 [ 63.450793][ T8692] vfs_writev+0x1b3/0x2f0 [ 63.455099][ T8692] ? vfs_iter_write+0xb0/0xb0 [ 63.459750][ T8692] ? find_held_lock+0x35/0x130 [ 63.464604][ T8692] ? __do_page_fault+0x56a/0xdd0 [ 63.469518][ T8692] ? lock_downgrade+0x920/0x920 [ 63.474358][ T8692] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 63.480570][ T8692] ? __fget_light+0x1a9/0x230 [ 63.485222][ T8692] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 63.491437][ T8692] do_writev+0x15b/0x330 [ 63.495655][ T8692] ? vfs_writev+0x2f0/0x2f0 [ 63.500134][ T8692] ? do_syscall_64+0x26/0x760 [ 63.504787][ T8692] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 63.510825][ T8692] ? do_syscall_64+0x26/0x760 [ 63.515490][ T8692] __x64_sys_writev+0x75/0xb0 [ 63.520147][ T8692] do_syscall_64+0xfa/0x760 [ 63.524626][ T8692] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 63.530490][ T8692] RIP: 0033:0x441b10 [ 63.534370][ T8692] 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 01 95 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 [ 63.553961][ T8692] RSP: 002b:00007ffeea253968 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 [ 63.562348][ T8692] RAX: ffffffffffffffda RBX: 00007ffeea253980 RCX: 0000000000441b10 [ 63.570294][ T8692] RDX: 0000000000000001 RSI: 00007ffeea2539b0 RDI: 00000000000000f0 [ 63.578238][ T8692] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000004 [ 63.586184][ T8692] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000f5e9 [ 63.594133][ T8692] R13: 0000000000402960 R14: 0000000000000000 R15: 0000000000000000 [ 63.602080][ T8692] Modules linked in: [ 63.605995][ T8692] ---[ end trace c44c5d93ff65c142 ]--- [ 63.611445][ T8692] RIP: 0010:skb_pull+0xea/0x110 [ 63.616309][ T8692] Code: 9d c8 00 00 00 49 89 dc 49 89 9d c8 00 00 00 e8 5c 37 d9 fb 4c 89 e0 5b 41 5c 41 5d 41 5e 5d c3 45 31 e4 eb ea e8 46 37 d9 fb <0f> 0b e8 ff 28 14 fc e9 44 ff ff ff e8 f5 28 14 fc eb 8a e8 0e 29 [ 63.635922][ T8692] RSP: 0018:ffff888093596e50 EFLAGS: 00010293 [ 63.641967][ T8692] RAX: ffff888090162140 RBX: 0000000000000004 RCX: ffffffff859913e6 [ 63.649942][ T8692] RDX: 0000000000000000 RSI: ffffffff8599143a RDI: 0000000000000004 [ 63.657946][ T8692] RBP: ffff888093596e70 R08: ffff888090162140 R09: fffffbfff14efb33 [ 63.665918][ T8692] R10: fffffbfff14efb32 R11: ffffffff8a77d997 R12: 0000000094a0ac0c [ 63.673875][ T8692] R13: ffff8880935974c0 R14: 00000000ffff8880 R15: ffff8880935974c0 [ 63.681854][ T8692] FS: 0000555556fd4880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 63.690785][ T8692] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 63.697371][ T8692] CR2: 0000000020000040 CR3: 000000008703d000 CR4: 00000000001406e0 [ 63.705383][ T8692] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 63.713332][ T8692] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 63.721306][ T8692] Kernel panic - not syncing: Fatal exception in interrupt [ 63.729750][ T8692] Kernel Offset: disabled [ 63.734065][ T8692] Rebooting in 86400 seconds..