[....] 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
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[   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
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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
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[   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
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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
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[   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
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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
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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
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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
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[   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
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[   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
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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
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[   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)
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[   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:
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[   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
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[   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
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executing program
executing program
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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..