[....] Starting enhanced syslogd: rsyslogd[ 12.562676] audit: type=1400 audit(1513623355.438:5): avc: denied { syslog } for pid=2998 comm="rsyslogd" capability=34 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 [?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.549227] audit: type=1400 audit(1513623360.424:6): avc: denied { map } for pid=3137 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added 'ci-upstream-kasan-gce-386-3,10.128.0.5' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 23.710823] audit: type=1400 audit(1513623366.586:7): avc: denied { map } for pid=3150 comm="syzkaller803675" path="/root/syzkaller803675421" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 29.346700] ================================================================== [ 29.354111] BUG: KASAN: double-free or invalid-free in skb_free_head+0x74/0xb0 [ 29.361446] [ 29.363044] CPU: 1 PID: 3148 Comm: sshd Not tainted 4.15.0-rc4+ #137 [ 29.369506] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.378827] Call Trace: [ 29.381386] dump_stack+0x194/0x257 [ 29.384989] ? arch_local_irq_restore+0x53/0x53 [ 29.389627] ? show_regs_print_info+0x18/0x18 [ 29.394088] ? check_noncircular+0x20/0x20 [ 29.398291] ? print_irqtrace_events+0x270/0x270 [ 29.403027] ? skb_free_head+0x74/0xb0 [ 29.406891] print_address_description+0x73/0x250 [ 29.411705] ? skb_free_head+0x74/0xb0 [ 29.415558] ? skb_free_head+0x74/0xb0 [ 29.419425] kasan_report_double_free+0x55/0x80 [ 29.424322] kasan_slab_free+0xa3/0xc0 [ 29.428180] kfree+0xca/0x250 [ 29.431254] skb_free_head+0x74/0xb0 [ 29.434938] skb_release_data+0x58c/0x790 [ 29.439062] ? skb_tx_error+0x2c0/0x2c0 [ 29.443000] ? check_noncircular+0x20/0x20 [ 29.447209] ? __lock_is_held+0xb6/0x140 [ 29.451247] skb_release_all+0x4a/0x60 [ 29.455100] consume_skb+0x153/0x490 [ 29.458783] ? alloc_skb_with_frags+0x750/0x750 [ 29.463421] ? virtqueue_get_buf_ctx+0x3b1/0x8b0 [ 29.468149] ? detach_buf+0x6a0/0x6a0 [ 29.471927] __dev_kfree_skb_any+0x85/0xa0 [ 29.476132] free_old_xmit_skbs.isra.28+0x15a/0x2c0 [ 29.481467] ? virtnet_cpu_down_prep+0x80/0x80 [ 29.487844] ? packet_rcv_fanout+0x7d0/0x7d0 [ 29.492221] ? dev_queue_xmit_nit+0x8af/0xc40 [ 29.496691] start_xmit+0x1b9/0x1650 [ 29.500381] ? virtnet_xdp+0x12a0/0x12a0 [ 29.504433] dev_hard_start_xmit+0x248/0xac0 [ 29.508823] ? validate_xmit_skb_list+0x120/0x120 [ 29.513634] ? perf_trace_lock_acquire+0x570/0x980 [ 29.518533] ? lock_acquire+0x1d5/0x580 [ 29.522733] ? lock_acquire+0x1d5/0x580 [ 29.526672] ? sch_direct_xmit+0x280/0x6d0 [ 29.530877] ? skb_csum_hwoffload_help+0x57/0xa0 [ 29.535605] ? lock_release+0xa40/0xa40 [ 29.539548] ? netif_skb_features+0x8e0/0x8e0 [ 29.544019] ? do_raw_spin_trylock+0x190/0x190 [ 29.548577] ? lock_acquire+0x1d5/0x580 [ 29.552527] sch_direct_xmit+0x31d/0x6d0 [ 29.556562] ? dev_deactivate_queue.constprop.29+0x260/0x260 [ 29.562336] __dev_queue_xmit+0x16f4/0x2070 [ 29.566631] ? netdev_pick_tx+0x300/0x300 [ 29.570751] ? check_noncircular+0x20/0x20 [ 29.574965] ? __lock_acquire+0x664/0x3e00 [ 29.579165] ? print_irqtrace_events+0x270/0x270 [ 29.583893] ? numa_migrate_preferred+0x250/0x250 [ 29.588709] ? print_irqtrace_events+0x270/0x270 [ 29.593436] ? ip_finish_output+0x85e/0xd10 [ 29.597726] ? netlbl_catmap_setrng+0xb0/0xb0 [ 29.602198] ? mark_held_locks+0xaf/0x100 [ 29.606310] ? ip_finish_output2+0xca6/0x1460 [ 29.610776] dev_queue_xmit+0x17/0x20 [ 29.614545] ip_finish_output2+0xece/0x1460 [ 29.618838] ? dst_output+0x140/0x140 [ 29.622605] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.627589] ? ipt_do_table+0xd04/0x1330 [ 29.631615] ? trace_hardirqs_on+0xd/0x10 [ 29.635731] ? __local_bh_enable_ip+0x121/0x230 [ 29.640370] ? ipt_do_table+0xd6f/0x1330 [ 29.644398] ? __local_bh_enable_ip+0x121/0x230 [ 29.649385] ? ipv4_mtu+0x28c/0x3d0 [ 29.652986] ? __lock_is_held+0xb6/0x140 [ 29.657037] ip_finish_output+0x85e/0xd10 [ 29.661152] ? ip_finish_output+0x85e/0xd10 [ 29.665444] ? ip_fragment.constprop.49+0x200/0x200 [ 29.670425] ? iptable_mangle_hook+0xa9/0x550 [ 29.674892] ? nf_hook_slow+0xd3/0x1a0 [ 29.678750] ip_output+0x1cc/0x860 [ 29.682258] ? ip_mc_output+0x1350/0x1350 [ 29.686382] ? ip_fragment.constprop.49+0x200/0x200 [ 29.691370] ip_local_out+0x95/0x160 [ 29.695061] ip_queue_xmit+0x8c6/0x18e0 [ 29.699013] ? ip_build_and_send_pkt+0xc30/0xc30 [ 29.703746] ? refcount_dec_if_one+0x20/0x20 [ 29.708127] ? __tcp_v4_send_check+0x1b8/0x350 [ 29.712675] ? tcp_options_write+0x228/0x940 [ 29.717056] tcp_transmit_skb+0x1b12/0x38b0 [ 29.721360] ? __tcp_select_window+0x900/0x900 [ 29.725913] ? __kernel_text_address+0xd/0x40 [ 29.730377] ? __lock_acquire+0x664/0x3e00 [ 29.734583] ? depot_save_stack+0x12c/0x490 [ 29.738883] ? tcp_small_queue_check.isra.26+0x31c/0x450 [ 29.744299] ? tcp_tso_segs+0x240/0x240 [ 29.748239] ? pvclock_read_flags+0x160/0x160 [ 29.752701] ? inet_sendmsg+0x11f/0x5e0 [ 29.756643] ? sock_sendmsg+0xca/0x110 [ 29.760507] ? sock_write_iter+0x31a/0x5d0 [ 29.764712] ? __vfs_write+0x684/0x970 [ 29.768564] ? vfs_write+0x189/0x510 [ 29.772245] ? SyS_write+0xef/0x220 [ 29.775844] ? entry_SYSCALL_64_fastpath+0x1f/0x96 [ 29.780750] ? sched_clock_cpu+0x1b/0x170 [ 29.784866] ? tcp_init_tso_segs+0x114/0x1f0 [ 29.789243] tcp_write_xmit+0x680/0x5190 [ 29.793282] ? rcu_read_lock_sched_held+0xe8/0x120 [ 29.798182] ? tcp_transmit_skb+0x38b0/0x38b0 [ 29.803165] ? __asan_register_globals+0x60/0xa0 [ 29.807898] ? find_held_lock+0x35/0x1d0 [ 29.811938] ? __might_fault+0x110/0x1d0 [ 29.815968] ? iov_iter_advance+0x2a1/0x13f0 [ 29.820346] ? lock_release+0xa40/0xa40 [ 29.824288] ? tcp_v4_md5_lookup+0x22/0x30 [ 29.828491] ? tcp_established_options+0x2c5/0x420 [ 29.833392] ? iov_iter_copy_from_user_atomic+0xe30/0xe30 [ 29.838896] __tcp_push_pending_frames+0xa0/0x250 [ 29.843711] tcp_push+0x538/0x770 [ 29.847138] ? tcp_splice_data_recv+0x1a0/0x1a0 [ 29.852206] ? skb_entail+0x5f6/0x8a0 [ 29.855979] ? iov_iter_advance+0x13f0/0x13f0 [ 29.860445] ? tcp_tx_timestamp+0x62/0x2a0 [ 29.864653] tcp_sendmsg_locked+0x2663/0x3b30 [ 29.869141] ? tcp_sendpage+0x60/0x60 [ 29.872918] ? rcu_read_lock_sched_held+0x108/0x120 [ 29.877901] ? __mark_inode_dirty+0x262/0x1170 [ 29.882714] ? print_irqtrace_events+0x270/0x270 [ 29.887435] ? find_held_lock+0x35/0x1d0 [ 29.891471] ? lock_sock_nested+0xa3/0x110 [ 29.895671] ? lock_acquire+0x1d5/0x580 [ 29.899611] ? tcp_sendmsg+0x21/0x50 [ 29.903300] ? mark_held_locks+0xaf/0x100 [ 29.907412] ? do_raw_spin_trylock+0x190/0x190 [ 29.911966] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.916947] ? lock_sock_nested+0x91/0x110 [ 29.921147] ? trace_hardirqs_on+0xd/0x10 [ 29.925263] ? __local_bh_enable_ip+0x121/0x230 [ 29.929906] tcp_sendmsg+0x2f/0x50 [ 29.933417] inet_sendmsg+0x11f/0x5e0 [ 29.937186] ? inet_recvmsg+0x5f0/0x5f0 [ 29.941128] ? selinux_socket_sendmsg+0x36/0x40 [ 29.945764] ? security_socket_sendmsg+0x89/0xb0 [ 29.950486] ? inet_recvmsg+0x5f0/0x5f0 [ 29.954429] sock_sendmsg+0xca/0x110 [ 29.958110] sock_write_iter+0x31a/0x5d0 [ 29.962141] ? sock_sendmsg+0x110/0x110 [ 29.966092] ? iov_iter_init+0xaf/0x1d0 [ 29.970049] __vfs_write+0x684/0x970 [ 29.973736] ? kernel_read+0x120/0x120 [ 29.977588] ? bpf_fd_pass+0x280/0x280 [ 29.981449] ? _cond_resched+0x14/0x30 [ 29.985308] ? selinux_file_permission+0x82/0x460 [ 29.990126] ? rw_verify_area+0xe5/0x2b0 [ 29.994152] ? __fdget_raw+0x20/0x20 [ 29.997836] vfs_write+0x189/0x510 [ 30.001345] SyS_write+0xef/0x220 [ 30.004768] ? SyS_read+0x220/0x220 [ 30.008360] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.013345] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 30.018072] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 30.022796] RIP: 0033:0x7fa7a1bea370 [ 30.026474] RSP: 002b:00007fffd0cd8078 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 30.034147] RAX: ffffffffffffffda RBX: 00005596efc53f70 RCX: 00007fa7a1bea370 [ 30.041383] RDX: 0000000000000038 RSI: 00005596efc45460 RDI: 0000000000000003 [ 30.048618] RBP: 0000000000000000 R08: 0000000000000001 R09: 0101010101010101 [ 30.056811] R10: 0000000000000008 R11: 0000000000000246 R12: 00005596ee269d20 [ 30.064049] R13: 00005596efc52b10 R14: 00005596efc52af0 R15: 0000000000000050 [ 30.071303] [ 30.072898] Allocated by task 3148: [ 30.076490] save_stack+0x43/0xd0 [ 30.079907] kasan_kmalloc+0xad/0xe0 [ 30.083586] __kmalloc_node_track_caller+0x47/0x70 [ 30.088482] __kmalloc_reserve.isra.41+0x41/0xd0 [ 30.093208] __alloc_skb+0x13b/0x780 [ 30.096888] sk_stream_alloc_skb+0x11d/0x900 [ 30.102048] tcp_sendmsg_locked+0x1341/0x3b30 [ 30.108338] tcp_sendmsg+0x2f/0x50 [ 30.112893] inet_sendmsg+0x11f/0x5e0 [ 30.118399] sock_sendmsg+0xca/0x110 [ 30.123035] sock_write_iter+0x31a/0x5d0 [ 30.127670] __vfs_write+0x684/0x970 [ 30.131347] vfs_write+0x189/0x510 [ 30.134853] SyS_write+0xef/0x220 [ 30.138273] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 30.142995] [ 30.144597] Freed by task 3148: [ 30.147857] save_stack+0x43/0xd0 [ 30.151273] kasan_slab_free+0x71/0xc0 [ 30.155134] kfree+0xca/0x250 [ 30.158206] skb_free_head+0x74/0xb0 [ 30.161884] skb_release_data+0x58c/0x790 [ 30.165996] skb_release_all+0x4a/0x60 [ 30.169851] consume_skb+0x153/0x490 [ 30.173531] __dev_kfree_skb_any+0x85/0xa0 [ 30.177748] free_old_xmit_skbs.isra.28+0x15a/0x2c0 [ 30.182746] start_xmit+0x1b9/0x1650 [ 30.186444] dev_hard_start_xmit+0x248/0xac0 [ 30.190831] sch_direct_xmit+0x31d/0x6d0 [ 30.194860] __dev_queue_xmit+0x16f4/0x2070 [ 30.199147] dev_queue_xmit+0x17/0x20 [ 30.202913] ip_finish_output2+0xece/0x1460 [ 30.207200] ip_finish_output+0x85e/0xd10 [ 30.211310] ip_output+0x1cc/0x860 [ 30.214813] ip_local_out+0x95/0x160 [ 30.218490] ip_queue_xmit+0x8c6/0x18e0 [ 30.222430] tcp_transmit_skb+0x1b12/0x38b0 [ 30.226716] tcp_write_xmit+0x680/0x5190 [ 30.230742] __tcp_push_pending_frames+0xa0/0x250 [ 30.235555] tcp_push+0x538/0x770 [ 30.238975] tcp_sendmsg_locked+0x2663/0x3b30 [ 30.243434] tcp_sendmsg+0x2f/0x50 [ 30.246940] inet_sendmsg+0x11f/0x5e0 [ 30.250708] sock_sendmsg+0xca/0x110 [ 30.254386] sock_write_iter+0x31a/0x5d0 [ 30.258410] __vfs_write+0x684/0x970 [ 30.262087] vfs_write+0x189/0x510 [ 30.265590] SyS_write+0xef/0x220 [ 30.269014] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 30.273740] [ 30.275338] The buggy address belongs to the object at ffff8801c8af6d80 [ 30.275338] which belongs to the cache kmalloc-1024 of size 1024 [ 30.288133] The buggy address is located 0 bytes inside of [ 30.288133] 1024-byte region [ffff8801c8af6d80, ffff8801c8af7180) [ 30.299883] The buggy address belongs to the page: [ 30.304780] page:0000000083619a1e count:1 mapcount:0 mapping:0000000028159b52 index:0x0 compound_mapcount: 0 [ 30.314713] flags: 0x2fffc0000008100(slab|head) [ 30.319355] raw: 02fffc0000008100 ffff8801c8af6000 0000000000000000 0000000100000007 [ 30.327204] raw: ffffea0007229120 ffffea000722f820 ffff8801db000ac0 0000000000000000 [ 30.336797] page dumped because: kasan: bad access detected [ 30.342471] [ 30.344063] Memory state around the buggy address: [ 30.348958] ffff8801c8af6c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.356281] ffff8801c8af6d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.363610] >ffff8801c8af6d80: fb fb fb fb 00 00 00 00 00 00 00 00 00 00 00 00 [ 30.370933] ^ [ 30.374265] ffff8801c8af6e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 30.381589] ffff8801c8af6e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 30.388914] ================================================================== [ 30.396235] Disabling lock debugging due to kernel taint [ 30.401649] Kernel panic - not syncing: panic_on_warn set ... [ 30.401649] [ 30.408977] CPU: 1 PID: 3148 Comm: sshd Tainted: G B 4.15.0-rc4+ #137 [ 30.416732] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.426571] Call Trace: [ 30.429128] dump_stack+0x194/0x257 [ 30.432730] ? arch_local_irq_restore+0x53/0x53 [ 30.437364] ? kasan_end_report+0x32/0x50 [ 30.442000] ? lock_downgrade+0x980/0x980 [ 30.446118] ? vsnprintf+0x1ed/0x1900 [ 30.449888] panic+0x1e4/0x41c [ 30.453045] ? refcount_error_report+0x214/0x214 [ 30.457768] ? add_taint+0x40/0x50 [ 30.461274] ? add_taint+0x1c/0x50 [ 30.464788] ? skb_free_head+0x74/0xb0 [ 30.468641] ? skb_free_head+0x74/0xb0 [ 30.472495] kasan_end_report+0x50/0x50 [ 30.476433] kasan_report_double_free+0x72/0x80 [ 30.481077] kasan_slab_free+0xa3/0xc0 [ 30.484931] kfree+0xca/0x250 [ 30.488017] skb_free_head+0x74/0xb0 [ 30.491708] skb_release_data+0x58c/0x790 [ 30.495828] ? skb_tx_error+0x2c0/0x2c0 [ 30.500293] ? check_noncircular+0x20/0x20 [ 30.504492] ? __lock_is_held+0xb6/0x140 [ 30.508523] skb_release_all+0x4a/0x60 [ 30.512381] consume_skb+0x153/0x490 [ 30.516063] ? alloc_skb_with_frags+0x750/0x750 [ 30.520700] ? virtqueue_get_buf_ctx+0x3b1/0x8b0 [ 30.525425] ? detach_buf+0x6a0/0x6a0 [ 30.529198] __dev_kfree_skb_any+0x85/0xa0 [ 30.533402] free_old_xmit_skbs.isra.28+0x15a/0x2c0 [ 30.538934] ? virtnet_cpu_down_prep+0x80/0x80 [ 30.543487] ? packet_rcv_fanout+0x7d0/0x7d0 [ 30.547870] ? dev_queue_xmit_nit+0x8af/0xc40 [ 30.552340] start_xmit+0x1b9/0x1650 [ 30.556031] ? virtnet_xdp+0x12a0/0x12a0 [ 30.560065] dev_hard_start_xmit+0x248/0xac0 [ 30.564442] ? validate_xmit_skb_list+0x120/0x120 [ 30.570556] ? perf_trace_lock_acquire+0x570/0x980 [ 30.576063] ? lock_acquire+0x1d5/0x580 [ 30.580006] ? lock_acquire+0x1d5/0x580 [ 30.583958] ? sch_direct_xmit+0x280/0x6d0 [ 30.588160] ? skb_csum_hwoffload_help+0x57/0xa0 [ 30.592885] ? lock_release+0xa40/0xa40 [ 30.596825] ? netif_skb_features+0x8e0/0x8e0 [ 30.601462] ? do_raw_spin_trylock+0x190/0x190 [ 30.606022] ? lock_acquire+0x1d5/0x580 [ 30.609977] sch_direct_xmit+0x31d/0x6d0 [ 30.614011] ? dev_deactivate_queue.constprop.29+0x260/0x260 [ 30.619792] __dev_queue_xmit+0x16f4/0x2070 [ 30.624084] ? netdev_pick_tx+0x300/0x300 [ 30.628202] ? check_noncircular+0x20/0x20 [ 30.632409] ? __lock_acquire+0x664/0x3e00 [ 30.636608] ? print_irqtrace_events+0x270/0x270 [ 30.641332] ? numa_migrate_preferred+0x250/0x250 [ 30.646143] ? print_irqtrace_events+0x270/0x270 [ 30.650870] ? ip_finish_output+0x85e/0xd10 [ 30.655168] ? netlbl_catmap_setrng+0xb0/0xb0 [ 30.659982] ? mark_held_locks+0xaf/0x100 [ 30.664365] ? ip_finish_output2+0xca6/0x1460 [ 30.668833] dev_queue_xmit+0x17/0x20 [ 30.672599] ip_finish_output2+0xece/0x1460 [ 30.676893] ? dst_output+0x140/0x140 [ 30.680660] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.686337] ? ipt_do_table+0xd04/0x1330 [ 30.690372] ? trace_hardirqs_on+0xd/0x10 [ 30.694486] ? __local_bh_enable_ip+0x121/0x230 [ 30.699123] ? ipt_do_table+0xd6f/0x1330 [ 30.703163] ? __local_bh_enable_ip+0x121/0x230 [ 30.707804] ? ipv4_mtu+0x28c/0x3d0 [ 30.711402] ? __lock_is_held+0xb6/0x140 [ 30.715434] ip_finish_output+0x85e/0xd10 [ 30.719549] ? ip_finish_output+0x85e/0xd10 [ 30.723840] ? ip_fragment.constprop.49+0x200/0x200 [ 30.729175] ? iptable_mangle_hook+0xa9/0x550 [ 30.733640] ? nf_hook_slow+0xd3/0x1a0 [ 30.737496] ip_output+0x1cc/0x860 [ 30.741001] ? ip_mc_output+0x1350/0x1350 [ 30.745130] ? ip_fragment.constprop.49+0x200/0x200 [ 30.750113] ip_local_out+0x95/0x160 [ 30.753793] ip_queue_xmit+0x8c6/0x18e0 [ 30.757737] ? ip_build_and_send_pkt+0xc30/0xc30 [ 30.762459] ? refcount_dec_if_one+0x20/0x20 [ 30.766836] ? __tcp_v4_send_check+0x1b8/0x350 [ 30.771385] ? tcp_options_write+0x228/0x940 [ 30.775761] tcp_transmit_skb+0x1b12/0x38b0 [ 30.780061] ? __tcp_select_window+0x900/0x900 [ 30.784611] ? __kernel_text_address+0xd/0x40 [ 30.789074] ? __lock_acquire+0x664/0x3e00 [ 30.793285] ? depot_save_stack+0x12c/0x490 [ 30.797579] ? tcp_small_queue_check.isra.26+0x31c/0x450 [ 30.802996] ? tcp_tso_segs+0x240/0x240 [ 30.806941] ? pvclock_read_flags+0x160/0x160 [ 30.811400] ? inet_sendmsg+0x11f/0x5e0 [ 30.815339] ? sock_sendmsg+0xca/0x110 [ 30.819190] ? sock_write_iter+0x31a/0x5d0 [ 30.823390] ? __vfs_write+0x684/0x970 [ 30.827242] ? vfs_write+0x189/0x510 [ 30.830919] ? SyS_write+0xef/0x220 [ 30.834510] ? entry_SYSCALL_64_fastpath+0x1f/0x96 [ 30.839408] ? sched_clock_cpu+0x1b/0x170 [ 30.843520] ? tcp_init_tso_segs+0x114/0x1f0 [ 30.847902] tcp_write_xmit+0x680/0x5190 [ 30.851935] ? rcu_read_lock_sched_held+0xe8/0x120 [ 30.856831] ? tcp_transmit_skb+0x38b0/0x38b0 [ 30.861291] ? __asan_register_globals+0x60/0xa0 [ 30.866027] ? find_held_lock+0x35/0x1d0 [ 30.870059] ? __might_fault+0x110/0x1d0 [ 30.874085] ? iov_iter_advance+0x2a1/0x13f0 [ 30.878458] ? lock_release+0xa40/0xa40 [ 30.882399] ? tcp_v4_md5_lookup+0x22/0x30 [ 30.886599] ? tcp_established_options+0x2c5/0x420 [ 30.891493] ? iov_iter_copy_from_user_atomic+0xe30/0xe30 [ 30.896997] __tcp_push_pending_frames+0xa0/0x250 [ 30.901813] tcp_push+0x538/0x770 [ 30.905233] ? tcp_splice_data_recv+0x1a0/0x1a0 [ 30.909869] ? skb_entail+0x5f6/0x8a0 [ 30.913636] ? iov_iter_advance+0x13f0/0x13f0 [ 30.918098] ? tcp_tx_timestamp+0x62/0x2a0 [ 30.922298] tcp_sendmsg_locked+0x2663/0x3b30 [ 30.926773] ? tcp_sendpage+0x60/0x60 [ 30.930545] ? rcu_read_lock_sched_held+0x108/0x120 [ 30.935529] ? __mark_inode_dirty+0x262/0x1170 [ 30.940078] ? print_irqtrace_events+0x270/0x270 [ 30.944797] ? find_held_lock+0x35/0x1d0 [ 30.948832] ? lock_sock_nested+0xa3/0x110 [ 30.953035] ? lock_acquire+0x1d5/0x580 [ 30.956975] ? tcp_sendmsg+0x21/0x50 [ 30.960661] ? mark_held_locks+0xaf/0x100 [ 30.964775] ? do_raw_spin_trylock+0x190/0x190 [ 30.969324] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.974306] ? lock_sock_nested+0x91/0x110 [ 30.979208] ? trace_hardirqs_on+0xd/0x10 [ 30.983328] ? __local_bh_enable_ip+0x121/0x230 [ 30.987968] tcp_sendmsg+0x2f/0x50 [ 30.991475] inet_sendmsg+0x11f/0x5e0 [ 30.995241] ? inet_recvmsg+0x5f0/0x5f0 [ 30.999180] ? selinux_socket_sendmsg+0x36/0x40 [ 31.003813] ? security_socket_sendmsg+0x89/0xb0 [ 31.008534] ? inet_recvmsg+0x5f0/0x5f0 [ 31.012473] sock_sendmsg+0xca/0x110 [ 31.016161] sock_write_iter+0x31a/0x5d0 [ 31.020189] ? sock_sendmsg+0x110/0x110 [ 31.024134] ? iov_iter_init+0xaf/0x1d0 [ 31.028075] __vfs_write+0x684/0x970 [ 31.031756] ? kernel_read+0x120/0x120 [ 31.035608] ? bpf_fd_pass+0x280/0x280 [ 31.039473] ? _cond_resched+0x14/0x30 [ 31.043335] ? selinux_file_permission+0x82/0x460 [ 31.048155] ? rw_verify_area+0xe5/0x2b0 [ 31.052189] ? __fdget_raw+0x20/0x20 [ 31.055867] vfs_write+0x189/0x510 [ 31.059374] SyS_write+0xef/0x220 [ 31.062793] ? SyS_read+0x220/0x220 [ 31.066395] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.071900] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 31.076890] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 31.081610] RIP: 0033:0x7fa7a1bea370 [ 31.085290] RSP: 002b:00007fffd0cd8078 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 31.092962] RAX: ffffffffffffffda RBX: 00005596efc53f70 RCX: 00007fa7a1bea370 [ 31.100207] RDX: 0000000000000038 RSI: 00005596efc45460 RDI: 0000000000000003 [ 31.107450] RBP: 0000000000000000 R08: 0000000000000001 R09: 0101010101010101 [ 31.114685] R10: 0000000000000008 R11: 0000000000000246 R12: 00005596ee269d20 [ 31.121928] R13: 00005596efc52b10 R14: 00005596efc52af0 R15: 0000000000000050 [ 31.129655] Dumping ftrace buffer: [ 31.133775] (ftrace buffer empty) [ 31.138872] Kernel Offset: disabled [ 31.142900] Rebooting in 86400 seconds..