[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[   37.417527] audit: type=1800 audit(1538219170.685:25): pid=5682 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0
[   37.456544] audit: type=1800 audit(1538219170.685:26): pid=5682 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0
[   37.488100] audit: type=1800 audit(1538219170.685:27): pid=5682 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 '10.128.10.42' (ECDSA) to the list of known hosts.
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syzkaller login: [   71.098338] raw_sendmsg: syz-executor182 forgot to set AF_INET. Fix it!
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[   81.455801] ==================================================================
[   81.463212] BUG: KASAN: use-after-free in ip_cmsg_recv_offset+0x12be/0x1390
[   81.470299] Read of size 4 at addr ffff8801d8d4f7e0 by task syz-executor182/6458
[   81.477813] 
[   81.479426] CPU: 0 PID: 6458 Comm: syz-executor182 Not tainted 4.19.0-rc5+ #121
[   81.487830] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   81.497242] Call Trace:
[   81.499834]  dump_stack+0x1c4/0x2b4
[   81.503450]  ? dump_stack_print_info.cold.2+0x52/0x52
[   81.508630]  ? printk+0xa7/0xcf
[   81.511896]  ? kmsg_dump_rewind_nolock+0xe4/0xe4
[   81.516650]  print_address_description.cold.8+0x9/0x1ff
[   81.522054]  kasan_report.cold.9+0x242/0x309
[   81.526468]  ? ip_cmsg_recv_offset+0x12be/0x1390
[   81.531215]  __asan_report_load4_noabort+0x14/0x20
[   81.537457]  ip_cmsg_recv_offset+0x12be/0x1390
[   81.543251]  ? ip_send_unicast_reply+0x1770/0x1770
[   81.549530]  ? _copy_to_iter+0x1540/0x1540
[   81.553850]  ? __skb_recv_datagram+0x262/0x300
[   81.558424]  ? get_futex_value_locked+0xcb/0xf0
[   81.563335]  ? __sanitizer_cov_trace_cmp4+0x16/0x20
[   81.568360]  ? futex_wait_setup+0x266/0x3e0
[   81.572689]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   81.578216]  ? skb_copy_datagram_iter+0x26e/0xc10
[   81.583140]  ? __sk_queue_drop_skb+0x1f0/0x1f0
[   81.587730]  ? rcu_read_unlock_special.part.39+0x11f0/0x11f0
[   81.593522]  raw_recvmsg+0x71d/0x8b0
[   81.597229]  ? raw_abort+0xa0/0xa0
[   81.600837]  ? aa_file_perm+0x490/0x1060
[   81.604999]  inet_recvmsg+0x181/0x6d0
[   81.608869]  ? aa_path_link+0x5e0/0x5e0
[   81.612906]  ? inet_sendpage+0x740/0x740
[   81.616959]  ? aa_sock_msg_perm.isra.12+0xba/0x160
[   81.621885]  ? apparmor_socket_recvmsg+0x29/0x30
[   81.626635]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   81.632169]  ? security_socket_recvmsg+0x9c/0xc0
[   81.636911]  ? inet_sendpage+0x740/0x740
[   81.640957]  sock_recvmsg+0xd0/0x110
[   81.644667]  sock_read_iter+0x39b/0x570
[   81.648682]  ? sock_recvmsg+0x110/0x110
[   81.653509]  do_iter_readv_writev+0x77c/0xa80
[   81.658064]  ? vfs_dedupe_file_range+0x670/0x670
[   81.662815]  ? rw_verify_area+0x118/0x360
[   81.667048]  do_iter_read+0x26e/0x650
[   81.670852]  ? dup_iter+0x270/0x270
[   81.674466]  vfs_readv+0x175/0x1c0
[   81.678009]  ? compat_rw_copy_check_uvector+0x440/0x440
[   81.683365]  ? __ia32_sys_getpeername+0xb0/0xb0
[   81.688023]  ? __do_page_fault+0x67d/0xed0
[   81.692254]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   81.697781]  ? __fdget_pos+0xde/0x200
[   81.701609]  ? __fdget_raw+0x20/0x20
[   81.705316]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
[   81.711258]  ? fput+0x130/0x1a0
[   81.714974]  do_readv+0x11a/0x310
[   81.718569]  ? vfs_readv+0x1c0/0x1c0
[   81.722278]  ? __bpf_trace_preemptirq_template+0x30/0x30
[   81.727740]  __x64_sys_readv+0x75/0xb0
[   81.731618]  do_syscall_64+0x1b9/0x820
[   81.735492]  ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe
[   81.740894]  ? syscall_return_slowpath+0x5e0/0x5e0
[   81.745815]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   81.750668]  ? trace_hardirqs_on_caller+0x310/0x310
[   81.755671]  ? prepare_exit_to_usermode+0x3b0/0x3b0
[   81.760774]  ? prepare_exit_to_usermode+0x291/0x3b0
[   81.765886]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   81.770725]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   81.775899] RIP: 0033:0x446469
[   81.779076] Code: e8 2c b3 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 2b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00
[   81.800507] RSP: 002b:00007f15c0ed6da8 EFLAGS: 00000293 ORIG_RAX: 0000000000000013
[   81.809536] RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 0000000000446469
[   81.816797] RDX: 0000000000000001 RSI: 0000000020000500 RDI: 0000000000000003
[   81.824068] RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000
[   81.831422] R10: 000000000000006e R11: 0000000000000293 R12: 00000000006dbc2c
[   81.838693] R13: 00000000004ae560 R14: 0000000020001300 R15: 00000000006dbd2c
[   81.845951] 
[   81.847612] Allocated by task 6458:
[   81.851232]  save_stack+0x43/0xd0
[   81.854792]  kasan_kmalloc+0xc7/0xe0
[   81.858546]  __kmalloc_node_track_caller+0x47/0x70
[   81.863462]  __kmalloc_reserve.isra.39+0x41/0xe0
[   81.868224]  __alloc_skb+0x155/0x770
[   81.871922]  __ip_append_data.isra.47+0x21d6/0x29b0
[   81.877513]  ip_append_data.part.48+0xef/0x170
[   81.882081]  ip_append_data+0x6d/0x90
[   81.885868]  raw_sendmsg+0x1220/0x4380
[   81.889877]  inet_sendmsg+0x1a1/0x690
[   81.893758]  sock_sendmsg+0xd5/0x120
[   81.897461]  __sys_sendto+0x3d7/0x670
[   81.901251]  __x64_sys_sendto+0xe1/0x1a0
[   81.905299]  do_syscall_64+0x1b9/0x820
[   81.909171]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   81.914340] 
[   81.915947] Freed by task 6458:
[   81.919211]  save_stack+0x43/0xd0
[   81.922649]  __kasan_slab_free+0x102/0x150
[   81.926865]  kasan_slab_free+0xe/0x10
[   81.930647]  kfree+0xcf/0x230
[   81.933740]  skb_free_head+0x99/0xc0
[   81.937439]  pskb_expand_head+0x3bb/0x10f0
[   81.941660]  __pskb_pull_tail+0x156/0x1890
[   81.945878]  ip_cmsg_recv_offset+0x113b/0x1390
[   81.950454]  raw_recvmsg+0x71d/0x8b0
[   81.954231]  inet_recvmsg+0x181/0x6d0
[   81.958025]  sock_recvmsg+0xd0/0x110
[   81.961729]  sock_read_iter+0x39b/0x570
[   81.965752]  do_iter_readv_writev+0x77c/0xa80
[   81.970322]  do_iter_read+0x26e/0x650
[   81.974626]  vfs_readv+0x175/0x1c0
[   81.978153]  do_readv+0x11a/0x310
[   81.981605]  __x64_sys_readv+0x75/0xb0
[   81.985480]  do_syscall_64+0x1b9/0x820
[   81.989354]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   81.994581] 
[   81.996198] The buggy address belongs to the object at ffff8801d8d4f7c0
[   81.996198]  which belongs to the cache kmalloc-512 of size 512
[   82.008913] The buggy address is located 32 bytes inside of
[   82.008913]  512-byte region [ffff8801d8d4f7c0, ffff8801d8d4f9c0)
[   82.020740] The buggy address belongs to the page:
[   82.025667] page:ffffea00076353c0 count:1 mapcount:0 mapping:ffff8801da800940 index:0x0
[   82.033796] flags: 0x2fffc0000000100(slab)
[   82.038024] raw: 02fffc0000000100 ffffea0007634f08 ffffea0007620bc8 ffff8801da800940
[   82.045899] raw: 0000000000000000 ffff8801d8d4f040 0000000100000006 0000000000000000
[   82.054437] page dumped because: kasan: bad access detected
[   82.061253] 
[   82.062863] Memory state around the buggy address:
[   82.067776]  ffff8801d8d4f680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   82.075146]  ffff8801d8d4f700: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
[   82.082672] >ffff8801d8d4f780: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
[   82.090087]                                                        ^
[   82.096669]  ffff8801d8d4f800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   82.104022]  ffff8801d8d4f880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   82.111360] ==================================================================
[   82.119758] Kernel panic - not syncing: panic_on_warn set ...
[   82.119758] 
[   82.128642] CPU: 0 PID: 6458 Comm: syz-executor182 Tainted: G    B             4.19.0-rc5+ #121
[   82.137471] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   82.147594] Call Trace:
[   82.150438]  dump_stack+0x1c4/0x2b4
[   82.154228]  ? dump_stack_print_info.cold.2+0x52/0x52
[   82.159551]  panic+0x238/0x4e7
[   82.162780]  ? add_taint.cold.5+0x16/0x16
[   82.166922]  ? preempt_schedule+0x4d/0x60
[   82.171055]  ? ___preempt_schedule+0x16/0x18
[   82.175455]  ? trace_hardirqs_on+0xb4/0x310
[   82.179915]  kasan_end_report+0x47/0x4f
[   82.183897]  kasan_report.cold.9+0x76/0x309
[   82.188204]  ? ip_cmsg_recv_offset+0x12be/0x1390
[   82.192946]  __asan_report_load4_noabort+0x14/0x20
[   82.198537]  ip_cmsg_recv_offset+0x12be/0x1390
[   82.203113]  ? ip_send_unicast_reply+0x1770/0x1770
[   82.208217]  ? _copy_to_iter+0x1540/0x1540
[   82.212441]  ? __skb_recv_datagram+0x262/0x300
[   82.217121]  ? get_futex_value_locked+0xcb/0xf0
[   82.221885]  ? __sanitizer_cov_trace_cmp4+0x16/0x20
[   82.226888]  ? futex_wait_setup+0x266/0x3e0
[   82.231198]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   82.236752]  ? skb_copy_datagram_iter+0x26e/0xc10
[   82.241590]  ? __sk_queue_drop_skb+0x1f0/0x1f0
[   82.246847]  ? rcu_read_unlock_special.part.39+0x11f0/0x11f0
[   82.252678]  raw_recvmsg+0x71d/0x8b0
[   82.256410]  ? raw_abort+0xa0/0xa0
[   82.259942]  ? aa_file_perm+0x490/0x1060
[   82.264004]  inet_recvmsg+0x181/0x6d0
[   82.267801]  ? aa_path_link+0x5e0/0x5e0
[   82.271764]  ? inet_sendpage+0x740/0x740
[   82.275959]  ? aa_sock_msg_perm.isra.12+0xba/0x160
[   82.280887]  ? apparmor_socket_recvmsg+0x29/0x30
[   82.285633]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   82.291163]  ? security_socket_recvmsg+0x9c/0xc0
[   82.295907]  ? inet_sendpage+0x740/0x740
[   82.299952]  sock_recvmsg+0xd0/0x110
[   82.303657]  sock_read_iter+0x39b/0x570
[   82.307618]  ? sock_recvmsg+0x110/0x110
[   82.311599]  do_iter_readv_writev+0x77c/0xa80
[   82.316104]  ? vfs_dedupe_file_range+0x670/0x670
[   82.321343]  ? rw_verify_area+0x118/0x360
[   82.325600]  do_iter_read+0x26e/0x650
[   82.329389]  ? dup_iter+0x270/0x270
[   82.333010]  vfs_readv+0x175/0x1c0
[   82.336540]  ? compat_rw_copy_check_uvector+0x440/0x440
[   82.341901]  ? __ia32_sys_getpeername+0xb0/0xb0
[   82.346603]  ? __do_page_fault+0x67d/0xed0
[   82.350838]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   82.356359]  ? __fdget_pos+0xde/0x200
[   82.360141]  ? __fdget_raw+0x20/0x20
[   82.363851]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
[   82.369873]  ? fput+0x130/0x1a0
[   82.373498]  do_readv+0x11a/0x310
[   82.376951]  ? vfs_readv+0x1c0/0x1c0
[   82.380686]  ? __bpf_trace_preemptirq_template+0x30/0x30
[   82.386186]  __x64_sys_readv+0x75/0xb0
[   82.390586]  do_syscall_64+0x1b9/0x820
[   82.395573]  ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe
[   82.401882]  ? syscall_return_slowpath+0x5e0/0x5e0
[   82.407928]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   82.414727]  ? trace_hardirqs_on_caller+0x310/0x310
[   82.420918]  ? prepare_exit_to_usermode+0x3b0/0x3b0
[   82.426962]  ? prepare_exit_to_usermode+0x291/0x3b0
[   82.431972]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   82.436820]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   82.441997] RIP: 0033:0x446469
[   82.445180] Code: e8 2c b3 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 2b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00
[   82.464112] RSP: 002b:00007f15c0ed6da8 EFLAGS: 00000293 ORIG_RAX: 0000000000000013
[   82.471808] RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 0000000000446469
[   82.479063] RDX: 0000000000000001 RSI: 0000000020000500 RDI: 0000000000000003
[   82.486320] RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000
[   82.494062] R10: 000000000000006e R11: 0000000000000293 R12: 00000000006dbc2c
[   82.501320] R13: 00000000004ae560 R14: 0000000020001300 R15: 00000000006dbd2c
[   82.509520] Kernel Offset: disabled
[   82.513141] Rebooting in 86400 seconds..