executing program syzkaller login: [ 13.077913] ------------[ cut here ]------------ [ 13.078275] WARNING: CPU: 1 PID: 2974 at mm/slab_common.c:1001 kmalloc_slab+0x5d/0x70 [ 13.078746] Kernel panic - not syncing: panic_on_warn set ... [ 13.078746] [ 13.079257] CPU: 1 PID: 2974 Comm: syzkaller727216 Not tainted 4.14.0-rc5-next-20171018+ #8 [ 13.079803] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 13.080299] Call Trace: [ 13.080461] dump_stack+0x194/0x257 [ 13.080683] ? arch_local_irq_restore+0x53/0x53 [ 13.080966] ? vsnprintf+0x1ed/0x1900 [ 13.081209] panic+0x1e4/0x41c [ 13.081402] ? refcount_error_report+0x214/0x214 [ 13.081684] ? show_regs_print_info+0x65/0x65 [ 13.081956] ? __warn+0x1a9/0x1e0 [ 13.082177] ? kmalloc_slab+0x5d/0x70 [ 13.082406] __warn+0x1c4/0x1e0 [ 13.082604] ? kmalloc_slab+0x5d/0x70 [ 13.082835] report_bug+0x211/0x2d0 [ 13.083151] fixup_bug+0x40/0x90 [ 13.083454] do_trap+0x260/0x390 [ 13.083769] do_error_trap+0x120/0x390 [ 13.084131] ? do_trap+0x390/0x390 [ 13.084460] ? kmalloc_slab+0x5d/0x70 [ 13.084807] ? ipv6_dev_get_saddr+0x4ec/0x9f0 [ 13.085215] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 13.085663] do_invalid_op+0x1b/0x20 [ 13.086579] invalid_op+0x18/0x20 [ 13.086894] RIP: 0010:kmalloc_slab+0x5d/0x70 [ 13.087279] RSP: 0018:ffff8800695174b0 EFLAGS: 00010246 [ 13.087757] RAX: 0000000000000000 RBX: ffff880069517748 RCX: ffffffff843a9363 [ 13.088389] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffffff8800 [ 13.089025] RBP: ffff8800695174b0 R08: ffff88003cbc6c40 R09: ffff880069517b10 [ 13.089678] R10: ffff880069517678 R11: 0000000000000000 R12: ffff880069517ab0 [ 13.090312] R13: ffff880069517b10 R14: 00000000014080c0 R15: ffff88003d90d080 [ 13.090967] ? ip6_setup_cork+0x173/0x15c0 [ 13.091476] __kmalloc+0x25/0x760 [ 13.091788] ? inet6_dump_ifaddr+0x30/0x30 [ 13.092170] ? ip6_setup_cork+0x1e8/0x15c0 [ 13.092556] ip6_setup_cork+0x1e8/0x15c0 [ 13.092926] ? __ip6_append_data.isra.43+0x3340/0x3340 [ 13.093391] ? ip6_pol_route_output+0x4c/0x60 [ 13.093799] ? ip6_pol_route_input+0x70/0x70 [ 13.094213] ip6_make_skb+0x282/0x530 [ 13.094564] ? ip_reply_glue_bits+0xb0/0xb0 [ 13.094956] ? ip6_push_pending_frames+0xe0/0xe0 [ 13.095479] ? ip6_dst_hoplimit+0x26c/0x420 [ 13.095871] ? lock_downgrade+0x990/0x990 [ 13.096268] ? __lock_is_held+0xb6/0x140 [ 13.096657] ? ip6_dst_hoplimit+0xc1/0x420 [ 13.097038] ? ip6_find_1stfragopt+0x240/0x240 [ 13.097464] udpv6_sendmsg+0x2769/0x3380 [ 13.097823] ? ip_reply_glue_bits+0xb0/0xb0 [ 13.098234] ? udpv6_setsockopt+0x80/0x80 [ 13.098608] ? reacquire_held_locks+0x1fd/0x3d0 [ 13.099074] ? reacquire_held_locks+0x1fd/0x3d0 [ 13.099545] ? find_held_lock+0x35/0x1d0 [ 13.099940] ? release_sock+0x1d4/0x2a0 [ 13.100334] ? lock_downgrade+0x990/0x990 [ 13.100731] ? lock_downgrade+0x990/0x990 [ 13.101121] ? do_raw_spin_trylock+0x190/0x190 [ 13.101560] ? __local_bh_enable_ip+0x9d/0x160 [ 13.101988] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 13.102472] ? release_sock+0x1d4/0x2a0 [ 13.102875] ? _raw_spin_unlock_bh+0x30/0x40 [ 13.103294] ? release_sock+0x1d4/0x2a0 [ 13.103652] ? udp_v6_get_port+0x9c/0xc0 [ 13.104024] inet_sendmsg+0x11f/0x5e0 [ 13.104354] ? inet_sendmsg+0x11f/0x5e0 [ 13.104715] ? __might_sleep+0x95/0x190 [ 13.105190] ? inet_recvmsg+0x5f0/0x5f0 [ 13.105550] ? selinux_socket_sendmsg+0x36/0x40 [ 13.105967] ? security_socket_sendmsg+0x89/0xb0 [ 13.106379] ? inet_recvmsg+0x5f0/0x5f0 [ 13.106730] sock_sendmsg+0xca/0x110 [ 13.107072] SYSC_sendto+0x352/0x5a0 [ 13.107412] ? SYSC_connect+0x470/0x470 [ 13.107785] ? mm_fault_error+0x2c0/0x2c0 [ 13.108186] ? sock_common_setsockopt+0x95/0xd0 [ 13.108611] ? SyS_recv+0x40/0x40 [ 13.108916] ? entry_SYSCALL_64_fastpath+0x5/0xbe [ 13.109617] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 13.110017] SyS_sendto+0x40/0x50 [ 13.110237] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 13.110520] RIP: 0033:0x435149 [ 13.110713] RSP: 002b:00007ffff971a978 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 13.111231] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000435149 [ 13.111655] RDX: 0000000000000000 RSI: 0000000020fd1000 RDI: 0000000000000003 [ 13.112148] RBP: 0000000000000082 R08: 0000000020e0afe4 R09: 000000000000001c [ 13.112584] R10: 0000000000000000 R11: 0000000000000217 R12: 04a17b4203d90165 [ 13.113079] R13: 0100000000000000 R14: 0000000000401b50 R15: 0000000000000000 [ 13.114021] Dumping ftrace buffer: [ 13.114478] (ftrace buffer empty) [ 13.114820] Kernel Offset: disabled [ 13.115162] Rebooting in 86400 seconds..