[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 44.710375] audit: type=1800 audit(1547577513.290:25): pid=7974 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 44.748963] audit: type=1800 audit(1547577513.290:26): pid=7974 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 44.792871] audit: type=1800 audit(1547577513.290:27): pid=7974 uid=0 auid=4294967295 ses=4294967295 subj=_ 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 '10.128.10.34' (ECDSA) to the list of known hosts. syzkaller login: [ 55.296838] IPVS: ftp: loaded support on port[0] = 21 [ 55.296844] IPVS: ftp: loaded support on port[0] = 21 [ 55.314612] IPVS: ftp: loaded support on port[0] = 21 [ 55.314957] IPVS: ftp: loaded support on port[0] = 21 [ 55.324671] IPVS: ftp: loaded support on port[0] = 21 [ 55.332383] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 56.630727] ================================================================== [ 56.638278] BUG: KASAN: use-after-free in __xfrm_policy_unlink+0x9ec/0xa00 [ 56.645295] Write of size 8 at addr ffff88808ad1d690 by task syz-executor791/8433 [ 56.652924] [ 56.654564] CPU: 1 PID: 8433 Comm: syz-executor791 Not tainted 5.0.0-rc2+ #27 [ 56.661841] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.671195] Call Trace: [ 56.673815] dump_stack+0x1db/0x2d0 executing program executing program executing program executing program executing program executing program executing program [ 56.677457] ? dump_stack_print_info.cold+0x20/0x20 [ 56.682482] ? find_held_lock+0x35/0x120 [ 56.686551] ? __xfrm_policy_unlink+0x9ec/0xa00 [ 56.691235] print_address_description.cold+0x7c/0x20d [ 56.696537] ? __xfrm_policy_unlink+0x9ec/0xa00 [ 56.701214] ? __xfrm_policy_unlink+0x9ec/0xa00 [ 56.706851] kasan_report.cold+0x1b/0x40 [ 56.710923] ? __xfrm_policy_unlink+0x9ec/0xa00 [ 56.715607] __asan_report_store8_noabort+0x17/0x20 [ 56.720631] __xfrm_policy_unlink+0x9ec/0xa00 [ 56.725139] ? xfrm_policy_walk_done+0x360/0x360 executing program executing program executing program executing program executing program executing program executing program [ 56.729903] ? __fib6_clean_all+0x300/0x430 [ 56.734239] ? xfrm_policy_byid+0x4a0/0x4a0 [ 56.738576] ? fib6_clean_tree+0x340/0x340 [ 56.742822] ? ipv6_route_yield+0x220/0x220 [ 56.747150] ? xfrm_pol_inexact_addr_use_any_list+0x1f0/0x1f0 [ 56.753053] xfrm_policy_insert+0x223/0x910 [ 56.757385] ? __fib6_clean_all+0x430/0x430 [ 56.761719] ? xfrm_policy_inexact_insert+0xda0/0xda0 [ 56.766917] ? copy_from_user_policy+0x110/0x2b0 [ 56.771684] ? xfrm_policy_construct+0x471/0x660 [ 56.776457] xfrm_add_policy+0x2a1/0x6c0 executing program executing program executing program executing program executing program executing program executing program [ 56.780522] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 56.786074] ? xfrm_policy_construct+0x660/0x660 [ 56.790858] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 56.796406] ? __nla_parse+0x12a/0x340 [ 56.800309] ? nla_parse+0x45/0x60 [ 56.803863] ? xfrm_policy_construct+0x660/0x660 [ 56.808632] xfrm_user_rcv_msg+0x458/0x8d0 [ 56.812898] ? xfrm_dump_sa_done+0xf0/0xf0 [ 56.817143] ? xfrm_netlink_rcv+0x61/0x90 [ 56.821310] ? __mutex_lock+0x622/0x1670 [ 56.825426] netlink_rcv_skb+0x17d/0x410 executing program executing program executing program executing program executing program executing program executing program [ 56.829527] ? xfrm_dump_sa_done+0xf0/0xf0 [ 56.833785] ? netlink_ack+0xba0/0xba0 [ 56.837683] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 56.842993] xfrm_netlink_rcv+0x70/0x90 [ 56.846980] netlink_unicast+0x574/0x770 [ 56.851071] ? netlink_attachskb+0x980/0x980 [ 56.855511] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 56.860544] netlink_sendmsg+0xa05/0xf90 [ 56.864627] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 56.870186] ? netlink_unicast+0x770/0x770 [ 56.874435] ? smack_socket_sendmsg+0xb1/0x1a0 executing program executing program executing program executing program executing program executing program [ 56.879083] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 56.884633] ? security_socket_sendmsg+0x93/0xc0 [ 56.889414] ? netlink_unicast+0x770/0x770 [ 56.893680] sock_sendmsg+0xdd/0x130 [ 56.897403] ___sys_sendmsg+0x7ec/0x910 [ 56.901393] ? copy_msghdr_from_user+0x570/0x570 [ 56.906157] ? __handle_mm_fault+0x955/0x55a0 [ 56.910660] ? add_lock_to_list.isra.0+0x450/0x450 [ 56.915605] ? vmf_insert_mixed_mkwrite+0x40/0x40 [ 56.920460] ? check_preemption_disabled+0x48/0x290 [ 56.925503] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 executing program executing program executing program executing program executing program executing program executing program [ 56.931054] ? __fget_light+0x2db/0x420 [ 56.935038] ? fget_raw+0x20/0x20 [ 56.938511] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 56.943800] ? rcu_read_unlock_special+0x380/0x380 [ 56.948743] ? __fdget+0x1b/0x20 [ 56.952123] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 56.957676] ? sockfd_lookup_light+0xc2/0x160 [ 56.962204] __sys_sendmsg+0x112/0x270 [ 56.966105] ? __ia32_sys_shutdown+0x80/0x80 [ 56.970524] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 56.976066] ? vmacache_update+0x114/0x140 executing program executing program executing program executing program executing program executing program [ 56.980321] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 56.985696] ? trace_hardirqs_off_caller+0x300/0x300 [ 56.990814] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 56.995588] __x64_sys_sendmsg+0x78/0xb0 [ 56.999673] do_syscall_64+0x1a3/0x800 [ 57.003571] ? syscall_return_slowpath+0x5f0/0x5f0 [ 57.008510] ? prepare_exit_to_usermode+0x232/0x3b0 [ 57.013802] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 57.018665] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 57.023860] RIP: 0033:0x442549 executing program executing program executing program executing program executing program executing program [ 57.027058] Code: e8 3c e7 ff ff 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 9b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 57.045968] RSP: 002b:00007fffd9092b58 EFLAGS: 00000207 ORIG_RAX: 000000000000002e [ 57.053712] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442549 [ 57.060999] RDX: 0000000000000000 RSI: 000000002014f000 RDI: 0000000000000003 [ 57.068277] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 57.075549] R10: 0000000000000000 R11: 0000000000000207 R12: 0000000000000030 executing program executing program executing program executing program executing program executing program executing program [ 57.082862] R13: 000000000000dce1 R14: 0000000000000000 R15: 0000000000000000 [ 57.090148] [ 57.091784] Allocated by task 8420: [ 57.095435] save_stack+0x45/0xd0 [ 57.098893] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 57.103837] kasan_kmalloc+0x9/0x10 [ 57.107488] kmem_cache_alloc_trace+0x151/0x760 [ 57.112162] xfrm_policy_alloc+0xfb/0x530 [ 57.116323] xfrm_policy_construct+0x30/0x660 [ 57.120824] xfrm_add_policy+0x20a/0x6c0 [ 57.124895] xfrm_user_rcv_msg+0x458/0x8d0 [ 57.129138] netlink_rcv_skb+0x17d/0x410 executing program executing program executing program executing program executing program executing program executing program [ 57.133204] xfrm_netlink_rcv+0x70/0x90 [ 57.137187] netlink_unicast+0x574/0x770 [ 57.141257] netlink_sendmsg+0xa05/0xf90 [ 57.145838] sock_sendmsg+0xdd/0x130 [ 57.149560] ___sys_sendmsg+0x7ec/0x910 [ 57.153549] __sys_sendmsg+0x112/0x270 [ 57.157460] __x64_sys_sendmsg+0x78/0xb0 [ 57.161530] do_syscall_64+0x1a3/0x800 [ 57.165430] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 57.170614] [ 57.172244] Freed by task 9: [ 57.175271] save_stack+0x45/0xd0 [ 57.178731] __kasan_slab_free+0x102/0x150 executing program executing program executing program executing program executing program executing program [ 57.182997] kasan_slab_free+0xe/0x10 [ 57.186798] kfree+0xcf/0x230 [ 57.189911] xfrm_policy_destroy_rcu+0x48/0x60 [ 57.194503] rcu_process_callbacks+0xc4a/0x1680 [ 57.199175] __do_softirq+0x30b/0xb11 [ 57.202995] [ 57.204634] The buggy address belongs to the object at ffff88808ad1d680 [ 57.204634] which belongs to the cache kmalloc-1k of size 1024 [ 57.217290] The buggy address is located 16 bytes inside of [ 57.217290] 1024-byte region [ffff88808ad1d680, ffff88808ad1da80) executing program executing program executing program executing program executing program executing program executing program [ 57.229187] The buggy address belongs to the page: [ 57.234133] page:ffffea00022b4700 count:1 mapcount:0 mapping:ffff88812c3f0ac0 index:0x0 compound_mapcount: 0 [ 57.244114] flags: 0x1fffc0000010200(slab|head) [ 57.248799] raw: 01fffc0000010200 ffffea0002912308 ffffea00028f6a88 ffff88812c3f0ac0 [ 57.256691] raw: 0000000000000000 ffff88808ad1c000 0000000100000007 0000000000000000 [ 57.264573] page dumped because: kasan: bad access detected [ 57.270277] [ 57.271907] Memory state around the buggy address: executing program executing program executing program executing program executing program executing program [ 57.276845] ffff88808ad1d580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 57.284211] ffff88808ad1d600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 57.291573] >ffff88808ad1d680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 57.298929] ^ [ 57.302825] ffff88808ad1d700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 57.310187] ffff88808ad1d780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 57.317546] ================================================================== [ 57.324903] Disabling lock debugging due to kernel taint executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 57.330418] Kernel panic - not syncing: panic_on_warn set ... [ 57.336318] CPU: 1 PID: 8433 Comm: syz-executor791 Tainted: G B 5.0.0-rc2+ #27 [ 57.344979] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.354346] Call Trace: [ 57.356946] dump_stack+0x1db/0x2d0 [ 57.360595] ? dump_stack_print_info.cold+0x20/0x20 [ 57.365624] panic+0x2cb/0x65c [ 57.368874] ? add_taint.cold+0x16/0x16 [ 57.372865] ? trace_hardirqs_on+0xb4/0x310 [ 57.377191] ? trace_hardirqs_on+0xb4/0x310 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 57.381538] ? __xfrm_policy_unlink+0x9ec/0xa00 [ 57.386228] end_report+0x47/0x4f [ 57.389689] ? __xfrm_policy_unlink+0x9ec/0xa00 [ 57.394363] kasan_report.cold+0xe/0x40 [ 57.398345] ? __xfrm_policy_unlink+0x9ec/0xa00 [ 57.403033] __asan_report_store8_noabort+0x17/0x20 [ 57.408072] __xfrm_policy_unlink+0x9ec/0xa00 [ 57.412577] ? xfrm_policy_walk_done+0x360/0x360 [ 57.417342] ? __fib6_clean_all+0x300/0x430 [ 57.421671] ? xfrm_policy_byid+0x4a0/0x4a0 [ 57.426013] ? fib6_clean_tree+0x340/0x340 [ 57.430267] ? ipv6_route_yield+0x220/0x220 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 57.434593] ? xfrm_pol_inexact_addr_use_any_list+0x1f0/0x1f0 [ 57.440490] xfrm_policy_insert+0x223/0x910 [ 57.444817] ? __fib6_clean_all+0x430/0x430 [ 57.449146] ? xfrm_policy_inexact_insert+0xda0/0xda0 [ 57.454347] ? copy_from_user_policy+0x110/0x2b0 [ 57.459117] ? xfrm_policy_construct+0x471/0x660 [ 57.463883] xfrm_add_policy+0x2a1/0x6c0 [ 57.467949] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 57.473505] ? xfrm_policy_construct+0x660/0x660 [ 57.478269] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 57.483817] ? __nla_parse+0x12a/0x340 [ 57.487715] ? nla_parse+0x45/0x60 [ 57.491265] ? xfrm_policy_construct+0x660/0x660 [ 57.496042] xfrm_user_rcv_msg+0x458/0x8d0 [ 57.500302] ? xfrm_dump_sa_done+0xf0/0xf0 [ 57.504553] ? xfrm_netlink_rcv+0x61/0x90 [ 57.508724] ? __mutex_lock+0x622/0x1670 [ 57.512866] netlink_rcv_skb+0x17d/0x410 [ 57.516954] ? xfrm_dump_sa_done+0xf0/0xf0 [ 57.521208] ? netlink_ack+0xba0/0xba0 [ 57.525102] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 57.530397] xfrm_netlink_rcv+0x70/0x90 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 57.534379] netlink_unicast+0x574/0x770 [ 57.538453] ? netlink_attachskb+0x980/0x980 [ 57.542876] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 57.547902] netlink_sendmsg+0xa05/0xf90 [ 57.551970] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 57.557534] ? netlink_unicast+0x770/0x770 [ 57.561784] ? smack_socket_sendmsg+0xb1/0x1a0 [ 57.566375] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 57.571920] ? security_socket_sendmsg+0x93/0xc0 [ 57.576686] ? netlink_unicast+0x770/0x770 [ 57.580937] sock_sendmsg+0xdd/0x130 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 57.584659] ___sys_sendmsg+0x7ec/0x910 [ 57.588640] ? copy_msghdr_from_user+0x570/0x570 [ 57.593406] ? __handle_mm_fault+0x955/0x55a0 [ 57.597909] ? add_lock_to_list.isra.0+0x450/0x450 [ 57.602865] ? vmf_insert_mixed_mkwrite+0x40/0x40 [ 57.607743] ? check_preemption_disabled+0x48/0x290 [ 57.612841] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 57.618397] ? __fget_light+0x2db/0x420 [ 57.622382] ? fget_raw+0x20/0x20 [ 57.625865] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 57.631153] ? rcu_read_unlock_special+0x380/0x380 [ 57.636092] ? __fdget+0x1b/0x20 [ 57.639463] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 57.645021] ? sockfd_lookup_light+0xc2/0x160 [ 57.649532] __sys_sendmsg+0x112/0x270 [ 57.653446] ? __ia32_sys_shutdown+0x80/0x80 [ 57.657860] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 57.663400] ? vmacache_update+0x114/0x140 [ 57.667658] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 57.673033] ? trace_hardirqs_off_caller+0x300/0x300 [ 57.678150] ? trace_hardirqs_on_thunk+0x1a/0x1c executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 57.682918] __x64_sys_sendmsg+0x78/0xb0 [ 57.687004] do_syscall_64+0x1a3/0x800 [ 57.690906] ? syscall_return_slowpath+0x5f0/0x5f0 [ 57.695842] ? prepare_exit_to_usermode+0x232/0x3b0 [ 57.700871] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 57.705726] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 57.710941] RIP: 0033:0x442549 [ 57.714170] Code: e8 3c e7 ff ff 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 9b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 executing program executing program executing program executing program executing program executing program executing program executing program [ 57.733077] RSP: 002b:00007fffd9092b58 EFLAGS: 00000207 ORIG_RAX: 000000000000002e [ 57.740816] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442549 [ 57.748088] RDX: 0000000000000000 RSI: 000000002014f000 RDI: 0000000000000003 [ 57.755360] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 57.762650] R10: 0000000000000000 R11: 0000000000000207 R12: 0000000000000030 [ 57.769922] R13: 000000000000dce1 R14: 0000000000000000 R15: 0000000000000000 [ 57.778075] Kernel Offset: disabled [ 57.781696] Rebooting in 86400 seconds..