[....] Starting enhanced syslogd: rsyslogd[ 10.758320] audit: type=1400 audit(1513502582.909:5): avc: denied { syslog } for pid=2988 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 periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] 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: [ 15.580156] audit: type=1400 audit(1513502587.730:6): avc: denied { map } for pid=3130 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-6,10.128.0.23' (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 executing program [ 21.925304] audit: type=1400 audit(1513502594.076:7): avc: denied { map } for pid=3144 comm="syzkaller434095" path="/root/syzkaller434095123" 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 28.621488] ================================================================== [ 28.628934] BUG: KASAN: double-free or invalid-free in skb_free_head+0x74/0xb0 [ 28.636268] [ 28.637871] CPU: 0 PID: 3142 Comm: sshd Not tainted 4.15.0-rc3+ #225 [ 28.644327] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.653670] Call Trace: [ 28.656234] dump_stack+0x194/0x257 [ 28.659832] ? arch_local_irq_restore+0x53/0x53 [ 28.664478] ? show_regs_print_info+0x18/0x18 [ 28.668940] ? check_noncircular+0x20/0x20 [ 28.673141] ? print_irqtrace_events+0x270/0x270 [ 28.677867] ? skb_free_head+0x74/0xb0 [ 28.681725] print_address_description+0x73/0x250 [ 28.686548] ? skb_free_head+0x74/0xb0 [ 28.690405] ? skb_free_head+0x74/0xb0 [ 28.694259] kasan_report_double_free+0x55/0x80 [ 28.698895] kasan_slab_free+0xa3/0xc0 [ 28.702754] kfree+0xca/0x250 [ 28.705832] skb_free_head+0x74/0xb0 [ 28.709515] skb_release_data+0x58c/0x790 [ 28.713640] ? skb_tx_error+0x2c0/0x2c0 [ 28.717580] ? check_noncircular+0x20/0x20 [ 28.721786] ? __lock_is_held+0xb6/0x140 [ 28.725823] skb_release_all+0x4a/0x60 [ 28.729678] consume_skb+0x153/0x490 [ 28.733361] ? alloc_skb_with_frags+0x750/0x750 [ 28.738000] ? virtqueue_get_buf_ctx+0x3b1/0x8b0 [ 28.742732] ? detach_buf+0x6a0/0x6a0 [ 28.746512] __dev_kfree_skb_any+0x85/0xa0 [ 28.750723] free_old_xmit_skbs.isra.28+0x15a/0x2c0 [ 28.755709] ? virtnet_cpu_down_prep+0x80/0x80 [ 28.760256] ? packet_rcv_fanout+0x7d0/0x7d0 [ 28.764639] ? dev_queue_xmit_nit+0x8af/0xc40 [ 28.769107] start_xmit+0x1b9/0x1650 [ 28.772796] ? virtnet_xdp+0x12a0/0x12a0 [ 28.776832] dev_hard_start_xmit+0x248/0xac0 [ 28.781214] ? validate_xmit_skb_list+0x120/0x120 [ 28.786035] ? perf_trace_lock_acquire+0x570/0x980 [ 28.790941] ? lock_acquire+0x1d5/0x580 [ 28.794881] ? lock_acquire+0x1d5/0x580 [ 28.798820] ? sch_direct_xmit+0x280/0x6d0 [ 28.803027] ? skb_csum_hwoffload_help+0x57/0xa0 [ 28.807755] ? lock_release+0xa40/0xa40 [ 28.811697] ? netif_skb_features+0x8e0/0x8e0 [ 28.816162] ? do_raw_spin_trylock+0x190/0x190 [ 28.820719] ? lock_acquire+0x1d5/0x580 [ 28.824672] sch_direct_xmit+0x31d/0x6d0 [ 28.828704] ? dev_deactivate_queue.constprop.29+0x260/0x260 [ 28.834479] __dev_queue_xmit+0x16f4/0x2070 [ 28.838775] ? netdev_pick_tx+0x300/0x300 [ 28.842896] ? check_noncircular+0x20/0x20 [ 28.847114] ? __lock_acquire+0x664/0x3e00 [ 28.851317] ? print_irqtrace_events+0x270/0x270 [ 28.856057] ? numa_migrate_preferred+0x250/0x250 [ 28.860886] ? print_irqtrace_events+0x270/0x270 [ 28.865618] ? ip_finish_output+0x85e/0xd10 [ 28.869908] ? netlbl_catmap_setrng+0xb0/0xb0 [ 28.874380] ? mark_held_locks+0xaf/0x100 [ 28.878502] ? ip_finish_output2+0xca6/0x1460 [ 28.882967] dev_queue_xmit+0x17/0x20 [ 28.886741] ip_finish_output2+0xece/0x1460 [ 28.891039] ? dst_output+0x140/0x140 [ 28.894807] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.899791] ? ipt_do_table+0xd04/0x1330 [ 28.903820] ? trace_hardirqs_on+0xd/0x10 [ 28.907937] ? __local_bh_enable_ip+0x121/0x230 [ 28.912582] ? ipt_do_table+0xd6f/0x1330 [ 28.916610] ? __local_bh_enable_ip+0x121/0x230 [ 28.921248] ? ipv4_mtu+0x28c/0x3d0 [ 28.924847] ? __lock_is_held+0xb6/0x140 [ 28.928887] ip_finish_output+0x85e/0xd10 [ 28.933001] ? ip_finish_output+0x85e/0xd10 [ 28.937297] ? ip_fragment.constprop.49+0x200/0x200 [ 28.942279] ? iptable_mangle_hook+0xa9/0x550 [ 28.946748] ? nf_hook_slow+0xd3/0x1a0 [ 28.950607] ip_output+0x1cc/0x860 [ 28.954116] ? ip_mc_output+0x1350/0x1350 [ 28.958240] ? ip_fragment.constprop.49+0x200/0x200 [ 28.963230] ip_local_out+0x95/0x160 [ 28.966922] ip_queue_xmit+0x8c6/0x18e0 [ 28.970869] ? ip_build_and_send_pkt+0xc30/0xc30 [ 28.975592] ? refcount_dec_if_one+0x20/0x20 [ 28.979971] ? __tcp_v4_send_check+0x1b8/0x350 [ 28.984527] ? tcp_options_write+0x228/0x940 [ 28.988906] tcp_transmit_skb+0x1b12/0x38b0 [ 28.993211] ? __tcp_select_window+0x900/0x900 [ 28.997763] ? __kernel_text_address+0xd/0x40 [ 29.002231] ? __lock_acquire+0x664/0x3e00 [ 29.006446] ? depot_save_stack+0x12c/0x490 [ 29.010742] ? tcp_small_queue_check.isra.26+0x31c/0x450 [ 29.016162] ? tcp_tso_segs+0x240/0x240 [ 29.020105] ? pvclock_read_flags+0x160/0x160 [ 29.024567] ? inet_sendmsg+0x11f/0x5e0 [ 29.028509] ? sock_sendmsg+0xca/0x110 [ 29.032371] ? sock_write_iter+0x31a/0x5d0 [ 29.036572] ? __vfs_write+0x684/0x970 [ 29.040430] ? vfs_write+0x189/0x510 [ 29.044109] ? SyS_write+0xef/0x220 [ 29.047703] ? entry_SYSCALL_64_fastpath+0x1f/0x96 [ 29.052615] ? sched_clock_cpu+0x1b/0x170 [ 29.056729] ? tcp_init_tso_segs+0x114/0x1f0 [ 29.061107] tcp_write_xmit+0x680/0x5190 [ 29.065147] ? rcu_read_lock_sched_held+0xe8/0x120 [ 29.070057] ? tcp_transmit_skb+0x38b0/0x38b0 [ 29.074518] ? kasan_kmalloc+0x50/0xe0 [ 29.078387] ? find_held_lock+0x35/0x1d0 [ 29.082426] ? __might_fault+0x110/0x1d0 [ 29.086463] ? iov_iter_advance+0x2a1/0x13f0 [ 29.090841] ? lock_release+0xa40/0xa40 [ 29.094785] ? tcp_v4_md5_lookup+0x22/0x30 [ 29.098989] ? tcp_established_options+0x2c5/0x420 [ 29.103891] ? iov_iter_copy_from_user_atomic+0xe30/0xe30 [ 29.109399] __tcp_push_pending_frames+0xa0/0x250 [ 29.114217] tcp_push+0x538/0x770 [ 29.117641] ? tcp_splice_data_recv+0x1a0/0x1a0 [ 29.122276] ? skb_entail+0x5f6/0x8a0 [ 29.126050] ? iov_iter_advance+0x13f0/0x13f0 [ 29.130518] ? tcp_tx_timestamp+0x62/0x2a0 [ 29.134724] tcp_sendmsg_locked+0x2663/0x3b30 [ 29.139211] ? tcp_sendpage+0x60/0x60 [ 29.142987] ? rcu_read_lock_sched_held+0x108/0x120 [ 29.147973] ? __mark_inode_dirty+0x262/0x1170 [ 29.152535] ? print_irqtrace_events+0x270/0x270 [ 29.157255] ? find_held_lock+0x35/0x1d0 [ 29.161291] ? lock_sock_nested+0xa3/0x110 [ 29.165490] ? lock_acquire+0x1d5/0x580 [ 29.169431] ? tcp_sendmsg+0x21/0x50 [ 29.173121] ? mark_held_locks+0xaf/0x100 [ 29.177234] ? do_raw_spin_trylock+0x190/0x190 [ 29.181793] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.186779] ? lock_sock_nested+0x91/0x110 [ 29.190980] ? trace_hardirqs_on+0xd/0x10 [ 29.195097] ? __local_bh_enable_ip+0x121/0x230 [ 29.199742] tcp_sendmsg+0x2f/0x50 [ 29.203252] inet_sendmsg+0x11f/0x5e0 [ 29.207029] ? inet_recvmsg+0x5f0/0x5f0 [ 29.210975] ? selinux_socket_sendmsg+0x36/0x40 [ 29.215611] ? security_socket_sendmsg+0x89/0xb0 [ 29.220332] ? inet_recvmsg+0x5f0/0x5f0 [ 29.224275] sock_sendmsg+0xca/0x110 [ 29.227957] sock_write_iter+0x31a/0x5d0 [ 29.231991] ? sock_sendmsg+0x110/0x110 [ 29.235944] ? iov_iter_init+0xaf/0x1d0 [ 29.239890] __vfs_write+0x684/0x970 [ 29.243572] ? kernel_read+0x120/0x120 [ 29.247427] ? bpf_fd_pass+0x280/0x280 [ 29.251286] ? _cond_resched+0x14/0x30 [ 29.255157] ? selinux_file_permission+0x82/0x460 [ 29.259977] ? rw_verify_area+0xe5/0x2b0 [ 29.264007] ? __fdget_raw+0x20/0x20 [ 29.267698] vfs_write+0x189/0x510 [ 29.271213] SyS_write+0xef/0x220 [ 29.274638] ? SyS_read+0x220/0x220 [ 29.278230] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.283214] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 29.287946] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 29.292667] RIP: 0033:0x7f7a61d22370 [ 29.296343] RSP: 002b:00007ffc93b90b98 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 29.304023] RAX: ffffffffffffffda RBX: 0000563815b397d0 RCX: 00007f7a61d22370 [ 29.311273] RDX: 0000000000000038 RSI: 0000563815b2b460 RDI: 0000000000000003 [ 29.318511] RBP: 00007ffc93b90b20 R08: 0000000000000001 R09: 0101010101010101 [ 29.325753] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000040 [ 29.332997] R13: 000000000000005e R14: 0000563815b304e0 R15: 00007ffc93b90b70 [ 29.340257] [ 29.341852] Allocated by task 3142: [ 29.345447] save_stack+0x43/0xd0 [ 29.348876] kasan_kmalloc+0xad/0xe0 [ 29.352557] __kmalloc_node_track_caller+0x47/0x70 [ 29.357462] __kmalloc_reserve.isra.41+0x41/0xd0 [ 29.362193] __alloc_skb+0x13b/0x780 [ 29.365971] sk_stream_alloc_skb+0x11d/0x900 [ 29.370343] tcp_sendmsg_locked+0x1341/0x3b30 [ 29.374802] tcp_sendmsg+0x2f/0x50 [ 29.378307] inet_sendmsg+0x11f/0x5e0 [ 29.382074] sock_sendmsg+0xca/0x110 [ 29.385754] sock_write_iter+0x31a/0x5d0 [ 29.389780] __vfs_write+0x684/0x970 [ 29.393457] vfs_write+0x189/0x510 [ 29.396960] SyS_write+0xef/0x220 [ 29.400381] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 29.405099] [ 29.406693] Freed by task 3142: [ 29.409937] save_stack+0x43/0xd0 [ 29.413353] kasan_slab_free+0x71/0xc0 [ 29.417206] kfree+0xca/0x250 [ 29.420278] skb_free_head+0x74/0xb0 [ 29.423958] skb_release_data+0x58c/0x790 [ 29.428072] skb_release_all+0x4a/0x60 [ 29.431923] consume_skb+0x153/0x490 [ 29.435603] __dev_kfree_skb_any+0x85/0xa0 [ 29.439803] free_old_xmit_skbs.isra.28+0x15a/0x2c0 [ 29.444784] start_xmit+0x1b9/0x1650 [ 29.448462] dev_hard_start_xmit+0x248/0xac0 [ 29.452835] sch_direct_xmit+0x31d/0x6d0 [ 29.456861] __dev_queue_xmit+0x16f4/0x2070 [ 29.461152] dev_queue_xmit+0x17/0x20 [ 29.464918] ip_finish_output2+0xece/0x1460 [ 29.469204] ip_finish_output+0x85e/0xd10 [ 29.473316] ip_output+0x1cc/0x860 [ 29.476822] ip_local_out+0x95/0x160 [ 29.480499] ip_queue_xmit+0x8c6/0x18e0 [ 29.484444] tcp_transmit_skb+0x1b12/0x38b0 [ 29.488730] tcp_write_xmit+0x680/0x5190 [ 29.493071] __tcp_push_pending_frames+0xa0/0x250 [ 29.497878] tcp_push+0x538/0x770 [ 29.501297] tcp_sendmsg_locked+0x2663/0x3b30 [ 29.505756] tcp_sendmsg+0x2f/0x50 [ 29.509259] inet_sendmsg+0x11f/0x5e0 [ 29.513031] sock_sendmsg+0xca/0x110 [ 29.516721] sock_write_iter+0x31a/0x5d0 [ 29.520748] __vfs_write+0x684/0x970 [ 29.524424] vfs_write+0x189/0x510 [ 29.527931] SyS_write+0xef/0x220 [ 29.531349] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 29.536072] [ 29.537667] The buggy address belongs to the object at ffff8801c719cdc0 [ 29.537667] which belongs to the cache kmalloc-1024 of size 1024 [ 29.550466] The buggy address is located 0 bytes inside of [ 29.550466] 1024-byte region [ffff8801c719cdc0, ffff8801c719d1c0) [ 29.562216] The buggy address belongs to the page: [ 29.567115] page:0000000009b6561b count:1 mapcount:0 mapping:00000000749a03ca index:0x0 compound_mapcount: 0 [ 29.577055] flags: 0x2fffc0000008100(slab|head) [ 29.581691] raw: 02fffc0000008100 ffff8801c719c040 0000000000000000 0000000100000007 [ 29.589537] raw: ffffea00071edf20 ffffea00071c9220 ffff8801db000ac0 0000000000000000 [ 29.597382] page dumped because: kasan: bad access detected [ 29.603054] [ 29.604648] Memory state around the buggy address: [ 29.609540] ffff8801c719cc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 29.616863] ffff8801c719cd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 29.624186] >ffff8801c719cd80: fb fb fb fb fb fb fb fb fb fb fb fb 00 00 00 00 [ 29.631510] ^ [ 29.636923] ffff8801c719ce00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 29.644246] ffff8801c719ce80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 29.651568] ================================================================== [ 29.658889] Disabling lock debugging due to kernel taint [ 29.664301] Kernel panic - not syncing: panic_on_warn set ... [ 29.664301] [ 29.671629] CPU: 0 PID: 3142 Comm: sshd Tainted: G B 4.15.0-rc3+ #225 [ 29.679386] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.688703] Call Trace: [ 29.691262] dump_stack+0x194/0x257 [ 29.694859] ? arch_local_irq_restore+0x53/0x53 [ 29.699495] ? kasan_end_report+0x32/0x50 [ 29.703608] ? lock_downgrade+0x980/0x980 [ 29.707721] ? vsnprintf+0x1ed/0x1900 [ 29.711487] panic+0x1e4/0x41c [ 29.714647] ? refcount_error_report+0x214/0x214 [ 29.719374] ? add_taint+0x40/0x50 [ 29.722880] ? add_taint+0x1c/0x50 [ 29.726386] ? skb_free_head+0x74/0xb0 [ 29.730239] ? skb_free_head+0x74/0xb0 [ 29.734091] kasan_end_report+0x50/0x50 [ 29.738034] kasan_report_double_free+0x72/0x80 [ 29.742667] kasan_slab_free+0xa3/0xc0 [ 29.746522] kfree+0xca/0x250 [ 29.749596] skb_free_head+0x74/0xb0 [ 29.753274] skb_release_data+0x58c/0x790 [ 29.757394] ? skb_tx_error+0x2c0/0x2c0 [ 29.761333] ? check_noncircular+0x20/0x20 [ 29.765533] ? __lock_is_held+0xb6/0x140 [ 29.769563] skb_release_all+0x4a/0x60 [ 29.773417] consume_skb+0x153/0x490 [ 29.777096] ? alloc_skb_with_frags+0x750/0x750 [ 29.781731] ? virtqueue_get_buf_ctx+0x3b1/0x8b0 [ 29.786454] ? detach_buf+0x6a0/0x6a0 [ 29.790226] __dev_kfree_skb_any+0x85/0xa0 [ 29.794428] free_old_xmit_skbs.isra.28+0x15a/0x2c0 [ 29.799413] ? virtnet_cpu_down_prep+0x80/0x80 [ 29.803959] ? packet_rcv_fanout+0x7d0/0x7d0 [ 29.808335] ? dev_queue_xmit_nit+0x8af/0xc40 [ 29.812805] start_xmit+0x1b9/0x1650 [ 29.816489] ? virtnet_xdp+0x12a0/0x12a0 [ 29.820521] dev_hard_start_xmit+0x248/0xac0 [ 29.824899] ? validate_xmit_skb_list+0x120/0x120 [ 29.829718] ? perf_trace_lock_acquire+0x570/0x980 [ 29.834614] ? lock_acquire+0x1d5/0x580 [ 29.838554] ? lock_acquire+0x1d5/0x580 [ 29.842493] ? sch_direct_xmit+0x280/0x6d0 [ 29.846691] ? skb_csum_hwoffload_help+0x57/0xa0 [ 29.851416] ? lock_release+0xa40/0xa40 [ 29.855362] ? netif_skb_features+0x8e0/0x8e0 [ 29.859824] ? do_raw_spin_trylock+0x190/0x190 [ 29.864372] ? lock_acquire+0x1d5/0x580 [ 29.868316] sch_direct_xmit+0x31d/0x6d0 [ 29.872350] ? dev_deactivate_queue.constprop.29+0x260/0x260 [ 29.878117] __dev_queue_xmit+0x16f4/0x2070 [ 29.882410] ? netdev_pick_tx+0x300/0x300 [ 29.886534] ? check_noncircular+0x20/0x20 [ 29.890739] ? __lock_acquire+0x664/0x3e00 [ 29.894939] ? print_irqtrace_events+0x270/0x270 [ 29.899660] ? numa_migrate_preferred+0x250/0x250 [ 29.904469] ? print_irqtrace_events+0x270/0x270 [ 29.909194] ? ip_finish_output+0x85e/0xd10 [ 29.913483] ? netlbl_catmap_setrng+0xb0/0xb0 [ 29.917948] ? mark_held_locks+0xaf/0x100 [ 29.922063] ? ip_finish_output2+0xca6/0x1460 [ 29.926525] dev_queue_xmit+0x17/0x20 [ 29.930289] ip_finish_output2+0xece/0x1460 [ 29.934579] ? dst_output+0x140/0x140 [ 29.938348] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.943328] ? ipt_do_table+0xd04/0x1330 [ 29.947355] ? trace_hardirqs_on+0xd/0x10 [ 29.951467] ? __local_bh_enable_ip+0x121/0x230 [ 29.956103] ? ipt_do_table+0xd6f/0x1330 [ 29.960131] ? __local_bh_enable_ip+0x121/0x230 [ 29.964765] ? ipv4_mtu+0x28c/0x3d0 [ 29.968366] ? __lock_is_held+0xb6/0x140 [ 29.972399] ip_finish_output+0x85e/0xd10 [ 29.976510] ? ip_finish_output+0x85e/0xd10 [ 29.980797] ? ip_fragment.constprop.49+0x200/0x200 [ 29.985776] ? iptable_mangle_hook+0xa9/0x550 [ 29.990242] ? nf_hook_slow+0xd3/0x1a0 [ 29.994098] ip_output+0x1cc/0x860 [ 29.997604] ? ip_mc_output+0x1350/0x1350 [ 30.001720] ? ip_fragment.constprop.49+0x200/0x200 [ 30.006706] ip_local_out+0x95/0x160 [ 30.010386] ip_queue_xmit+0x8c6/0x18e0 [ 30.014329] ? ip_build_and_send_pkt+0xc30/0xc30 [ 30.019056] ? refcount_dec_if_one+0x20/0x20 [ 30.023432] ? __tcp_v4_send_check+0x1b8/0x350 [ 30.027980] ? tcp_options_write+0x228/0x940 [ 30.032360] tcp_transmit_skb+0x1b12/0x38b0 [ 30.036652] ? __tcp_select_window+0x900/0x900 [ 30.041204] ? __kernel_text_address+0xd/0x40 [ 30.045667] ? __lock_acquire+0x664/0x3e00 [ 30.049873] ? depot_save_stack+0x12c/0x490 [ 30.054164] ? tcp_small_queue_check.isra.26+0x31c/0x450 [ 30.059582] ? tcp_tso_segs+0x240/0x240 [ 30.063528] ? pvclock_read_flags+0x160/0x160 [ 30.068004] ? inet_sendmsg+0x11f/0x5e0 [ 30.072043] ? sock_sendmsg+0xca/0x110 [ 30.075900] ? sock_write_iter+0x31a/0x5d0 [ 30.080098] ? __vfs_write+0x684/0x970 [ 30.083948] ? vfs_write+0x189/0x510 [ 30.087623] ? SyS_write+0xef/0x220 [ 30.091218] ? entry_SYSCALL_64_fastpath+0x1f/0x96 [ 30.096117] ? sched_clock_cpu+0x1b/0x170 [ 30.100231] ? tcp_init_tso_segs+0x114/0x1f0 [ 30.104615] tcp_write_xmit+0x680/0x5190 [ 30.108649] ? rcu_read_lock_sched_held+0xe8/0x120 [ 30.113547] ? tcp_transmit_skb+0x38b0/0x38b0 [ 30.118009] ? kasan_kmalloc+0x50/0xe0 [ 30.121874] ? find_held_lock+0x35/0x1d0 [ 30.125906] ? __might_fault+0x110/0x1d0 [ 30.129933] ? iov_iter_advance+0x2a1/0x13f0 [ 30.134308] ? lock_release+0xa40/0xa40 [ 30.138257] ? tcp_v4_md5_lookup+0x22/0x30 [ 30.142459] ? tcp_established_options+0x2c5/0x420 [ 30.147353] ? iov_iter_copy_from_user_atomic+0xe30/0xe30 [ 30.152868] __tcp_push_pending_frames+0xa0/0x250 [ 30.157686] tcp_push+0x538/0x770 [ 30.161108] ? tcp_splice_data_recv+0x1a0/0x1a0 [ 30.165741] ? skb_entail+0x5f6/0x8a0 [ 30.169507] ? iov_iter_advance+0x13f0/0x13f0 [ 30.173968] ? tcp_tx_timestamp+0x62/0x2a0 [ 30.178172] tcp_sendmsg_locked+0x2663/0x3b30 [ 30.182643] ? tcp_sendpage+0x60/0x60 [ 30.186421] ? rcu_read_lock_sched_held+0x108/0x120 [ 30.191410] ? __mark_inode_dirty+0x262/0x1170 [ 30.195959] ? print_irqtrace_events+0x270/0x270 [ 30.200677] ? find_held_lock+0x35/0x1d0 [ 30.204707] ? lock_sock_nested+0xa3/0x110 [ 30.208907] ? lock_acquire+0x1d5/0x580 [ 30.212845] ? tcp_sendmsg+0x21/0x50 [ 30.216529] ? mark_held_locks+0xaf/0x100 [ 30.220643] ? do_raw_spin_trylock+0x190/0x190 [ 30.225190] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.230171] ? lock_sock_nested+0x91/0x110 [ 30.234372] ? trace_hardirqs_on+0xd/0x10 [ 30.238486] ? __local_bh_enable_ip+0x121/0x230 [ 30.243124] tcp_sendmsg+0x2f/0x50 [ 30.246633] inet_sendmsg+0x11f/0x5e0 [ 30.250403] ? inet_recvmsg+0x5f0/0x5f0 [ 30.254346] ? selinux_socket_sendmsg+0x36/0x40 [ 30.258984] ? security_socket_sendmsg+0x89/0xb0 [ 30.263704] ? inet_recvmsg+0x5f0/0x5f0 [ 30.267644] sock_sendmsg+0xca/0x110 [ 30.271331] sock_write_iter+0x31a/0x5d0 [ 30.275357] ? sock_sendmsg+0x110/0x110 [ 30.279301] ? iov_iter_init+0xaf/0x1d0 [ 30.283244] __vfs_write+0x684/0x970 [ 30.286931] ? kernel_read+0x120/0x120 [ 30.290786] ? bpf_fd_pass+0x280/0x280 [ 30.294653] ? _cond_resched+0x14/0x30 [ 30.298507] ? selinux_file_permission+0x82/0x460 [ 30.303324] ? rw_verify_area+0xe5/0x2b0 [ 30.307352] ? __fdget_raw+0x20/0x20 [ 30.311033] vfs_write+0x189/0x510 [ 30.314539] SyS_write+0xef/0x220 [ 30.317960] ? SyS_read+0x220/0x220 [ 30.321554] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.326536] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 30.331262] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 30.335982] RIP: 0033:0x7f7a61d22370 [ 30.339668] RSP: 002b:00007ffc93b90b98 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 30.347342] RAX: ffffffffffffffda RBX: 0000563815b397d0 RCX: 00007f7a61d22370 [ 30.354577] RDX: 0000000000000038 RSI: 0000563815b2b460 RDI: 0000000000000003 [ 30.361811] RBP: 00007ffc93b90b20 R08: 0000000000000001 R09: 0101010101010101 [ 30.369045] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000040 [ 30.376279] R13: 000000000000005e R14: 0000563815b304e0 R15: 00007ffc93b90b70 [ 30.384070] Dumping ftrace buffer: [ 30.387575] (ftrace buffer empty) [ 30.391251] Kernel Offset: disabled [ 30.394843] Rebooting in 86400 seconds..