[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 52.710945][ T27] audit: type=1800 audit(1566658191.118:25): pid=8339 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 52.731539][ T27] audit: type=1800 audit(1566658191.138:26): pid=8339 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 52.767139][ T27] audit: type=1800 audit(1566658191.138:27): pid=8339 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 '10.128.10.40' (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: [ 61.609678][ T8495] IPVS: ftp: loaded support on port[0] = 21 [ 61.668013][ T8503] ------------[ cut here ]------------ [ 61.673555][ T8503] kernel BUG at include/linux/skbuff.h:2233! [ 61.679570][ T8503] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 61.685646][ T8503] CPU: 1 PID: 8503 Comm: syz-executor297 Not tainted 5.3.0-rc5-next-20190823 #72 [ 61.694729][ T8503] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.704772][ T8503] RIP: 0010:skb_pull+0xea/0x110 [ 61.709599][ T8503] 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 [ 61.729552][ T8503] RSP: 0018:ffff88809b1e6e50 EFLAGS: 00010293 [ 61.735603][ T8503] RAX: ffff88808a846300 RBX: 0000000000000004 RCX: ffffffff859913e6 [ 61.743550][ T8503] RDX: 0000000000000000 RSI: ffffffff8599143a RDI: 0000000000000004 [ 61.751496][ T8503] RBP: ffff88809b1e6e70 R08: ffff88808a846300 R09: fffffbfff14efb33 [ 61.759529][ T8503] R10: fffffbfff14efb32 R11: ffffffff8a77d997 R12: 0000000095a5e78c [ 61.767476][ T8503] R13: ffff88809b1e74c0 R14: 00000000ffff8880 R15: ffff88809b1e74c0 [ 61.775455][ T8503] FS: 0000555555d11880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 61.784360][ T8503] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 61.790915][ T8503] CR2: 0000000020000040 CR3: 00000000a11ea000 CR4: 00000000001406e0 [ 61.798863][ T8503] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 61.806851][ T8503] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 61.814797][ T8503] Call Trace: [ 61.818077][ T8503] ? __kasan_check_read+0x11/0x20 [ 61.823080][ T8503] sctp_inq_pop+0x2f1/0xd80 [ 61.827562][ T8503] sctp_endpoint_bh_rcv+0x184/0x8d0 [ 61.832755][ T8503] ? sctp_endpoint_lookup_assoc+0x290/0x290 [ 61.838630][ T8503] ? rwlock_bug.part.0+0x90/0x90 [ 61.843540][ T8503] ? lock_acquire+0x190/0x410 [ 61.848193][ T8503] sctp_inq_push+0x1e4/0x280 [ 61.852756][ T8503] sctp_rcv+0x2807/0x3590 [ 61.857060][ T8503] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 61.863278][ T8503] ? sctp_addrs_lookup_transport+0x7a0/0x7a0 [ 61.869229][ T8503] ? __kasan_check_read+0x11/0x20 [ 61.874236][ T8503] ? mark_lock+0xc2/0x1220 [ 61.878627][ T8503] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 61.884841][ T8503] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 61.890969][ T8503] ? rcu_read_lock_held+0x9c/0xb0 [ 61.895966][ T8503] sctp6_rcv+0x17/0x30 [ 61.900015][ T8503] ip6_protocol_deliver_rcu+0x2fe/0x1660 [ 61.905623][ T8503] ip6_input_finish+0x84/0x170 [ 61.910361][ T8503] ip6_input+0xe4/0x3f0 [ 61.914490][ T8503] ? ip6_input_finish+0x170/0x170 [ 61.919488][ T8503] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 61.925626][ T8503] ? ip6_protocol_deliver_rcu+0x1660/0x1660 [ 61.931496][ T8503] ? rcu_read_lock_held_common+0x130/0x130 [ 61.937883][ T8503] ip6_sublist_rcv_finish+0x98/0x1e0 [ 61.943158][ T8503] ip6_sublist_rcv+0x80c/0xcf0 [ 61.947897][ T8503] ? ip6_rcv_finish+0x2f0/0x2f0 [ 61.952747][ T8503] ? ip6_rcv_finish_core.isra.0+0x560/0x560 [ 61.958612][ T8503] ? ip6_rcv_core.isra.0+0x1011/0x1bb0 [ 61.964043][ T8503] ipv6_list_rcv+0x373/0x4b0 [ 61.968608][ T8503] ? __kasan_check_read+0x11/0x20 [ 61.973608][ T8503] ? ipv6_rcv+0x420/0x420 [ 61.977909][ T8503] ? __lock_acquire+0x8a1/0x4e70 [ 61.982819][ T8503] ? __kasan_check_read+0x11/0x20 [ 61.987819][ T8503] ? ipv6_rcv+0x420/0x420 [ 61.992122][ T8503] __netif_receive_skb_list_core+0x5fc/0x9d0 [ 61.998096][ T8503] ? ktime_get_with_offset+0x13a/0x350 [ 62.003529][ T8503] ? ktime_get_with_offset+0x13a/0x350 [ 62.008977][ T8503] ? process_backlog+0x750/0x750 [ 62.013908][ T8503] ? lock_acquire+0x190/0x410 [ 62.018562][ T8503] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 62.024777][ T8503] ? __kasan_check_read+0x11/0x20 [ 62.029774][ T8503] netif_receive_skb_list_internal+0x7eb/0xe60 [ 62.035899][ T8503] ? __netif_receive_skb_list_core+0x9d0/0x9d0 [ 62.042022][ T8503] ? __kasan_check_read+0x11/0x20 [ 62.047020][ T8503] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 62.053235][ T8503] ? eth_gro_receive+0x890/0x890 [ 62.058161][ T8503] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.064136][ T8503] gro_normal_list.part.0+0x1e/0xb0 [ 62.069319][ T8503] napi_gro_frags+0xa6a/0xea0 [ 62.073974][ T8503] tun_get_user+0x2e98/0x3fa0 [ 62.078624][ T8503] ? __kasan_check_read+0x11/0x20 [ 62.083621][ T8503] ? __lock_acquire+0x8a1/0x4e70 [ 62.088536][ T8503] ? tun_build_skb.isra.0+0x1390/0x1390 [ 62.094061][ T8503] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 62.100272][ T8503] ? __kasan_check_read+0x11/0x20 [ 62.105267][ T8503] tun_chr_write_iter+0xbd/0x156 [ 62.110181][ T8503] do_iter_readv_writev+0x5f8/0x8f0 [ 62.115354][ T8503] ? no_seek_end_llseek_size+0x70/0x70 [ 62.120790][ T8503] ? apparmor_file_permission+0x25/0x30 [ 62.126309][ T8503] ? rw_verify_area+0x126/0x360 [ 62.131131][ T8503] do_iter_write+0x17b/0x380 [ 62.135706][ T8503] vfs_writev+0x1b3/0x2f0 [ 62.140012][ T8503] ? vfs_iter_write+0xb0/0xb0 [ 62.144661][ T8503] ? find_held_lock+0x35/0x130 [ 62.149399][ T8503] ? __do_page_fault+0x56a/0xdd0 [ 62.154310][ T8503] ? lock_downgrade+0x920/0x920 [ 62.159139][ T8503] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 62.165350][ T8503] ? __fget_light+0x1a9/0x230 [ 62.170001][ T8503] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 62.176221][ T8503] do_writev+0x15b/0x330 [ 62.180437][ T8503] ? vfs_writev+0x2f0/0x2f0 [ 62.184915][ T8503] ? do_syscall_64+0x26/0x760 [ 62.189567][ T8503] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 62.195617][ T8503] ? do_syscall_64+0x26/0x760 [ 62.200266][ T8503] __x64_sys_writev+0x75/0xb0 [ 62.204916][ T8503] do_syscall_64+0xfa/0x760 [ 62.209390][ T8503] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 62.215253][ T8503] RIP: 0033:0x441b10 [ 62.219120][ T8503] 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 [ 62.238693][ T8503] RSP: 002b:00007ffd637e9378 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 [ 62.247091][ T8503] RAX: ffffffffffffffda RBX: 00007ffd637e9390 RCX: 0000000000441b10 [ 62.255041][ T8503] RDX: 0000000000000001 RSI: 00007ffd637e93c0 RDI: 00000000000000f0 [ 62.262992][ T8503] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000004 [ 62.270934][ T8503] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000f0c8 [ 62.278878][ T8503] R13: 0000000000402960 R14: 0000000000000000 R15: 0000000000000000 [ 62.287083][ T8503] Modules linked in: [ 62.290996][ T8503] ---[ end trace 69b54511f1fa3bea ]--- [ 62.296478][ T8503] RIP: 0010:skb_pull+0xea/0x110 [ 62.301304][ T8503] 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 [ 62.321012][ T8503] RSP: 0018:ffff88809b1e6e50 EFLAGS: 00010293 [ 62.327073][ T8503] RAX: ffff88808a846300 RBX: 0000000000000004 RCX: ffffffff859913e6 [ 62.335019][ T8503] RDX: 0000000000000000 RSI: ffffffff8599143a RDI: 0000000000000004 [ 62.343002][ T8503] RBP: ffff88809b1e6e70 R08: ffff88808a846300 R09: fffffbfff14efb33 [ 62.350969][ T8503] R10: fffffbfff14efb32 R11: ffffffff8a77d997 R12: 0000000095a5e78c [ 62.358936][ T8503] R13: ffff88809b1e74c0 R14: 00000000ffff8880 R15: ffff88809b1e74c0 [ 62.366904][ T8503] FS: 0000555555d11880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 62.375829][ T8503] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 62.382398][ T8503] CR2: 0000000020000040 CR3: 00000000a11ea000 CR4: 00000000001406e0 [ 62.390368][ T8503] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 62.398419][ T8503] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 62.406384][ T8503] Kernel panic - not syncing: Fatal exception in interrupt [ 62.414708][ T8503] Kernel Offset: disabled [ 62.419020][ T8503] Rebooting in 86400 seconds..