[ 41.048776] audit: type=1800 audit(1578290940.242:31): pid=7799 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 46.003515] kauditd_printk_skb: 3 callbacks suppressed [ 46.003531] audit: type=1400 audit(1578290945.262:35): avc: denied { map } for pid=7973 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 '10.128.0.30' (ECDSA) to the list of known hosts. executing program [ 52.768774] audit: type=1400 audit(1578290952.032:36): avc: denied { map } for pid=7985 comm="syz-executor254" path="/root/syz-executor254769414" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 52.773286] netlink: 20 bytes leftover after parsing attributes in process `syz-executor254'. [ 52.810754] netlink: 20 bytes leftover after parsing attributes in process `syz-executor254'. [ 52.874617] [ 52.876286] ============================================ [ 52.881735] WARNING: possible recursive locking detected [ 52.887211] 4.19.93-syzkaller #0 Not tainted [ 52.891618] -------------------------------------------- [ 52.897072] syz-executor254/7985 is trying to acquire lock: [ 52.902781] 00000000076d622b (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 [ 52.909645] [ 52.909645] but task is already holding lock: [ 52.915626] 00000000076d622b (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x40a/0xb00 [ 52.923349] [ 52.923349] other info that might help us debug this: [ 52.930011] Possible unsafe locking scenario: [ 52.930011] [ 52.936198] CPU0 [ 52.938776] ---- [ 52.941358] lock(rtnl_mutex); [ 52.944634] lock(rtnl_mutex); [ 52.947913] [ 52.947913] *** DEADLOCK *** [ 52.947913] [ 52.953973] May be due to missing lock nesting notation [ 52.953973] [ 52.960900] 1 lock held by syz-executor254/7985: [ 52.966518] #0: 00000000076d622b (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x40a/0xb00 [ 52.974678] [ 52.974678] stack backtrace: [ 52.979187] CPU: 1 PID: 7985 Comm: syz-executor254 Not tainted 4.19.93-syzkaller #0 [ 52.986981] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.996361] Call Trace: [ 52.998959] dump_stack+0x197/0x210 [ 53.002595] __lock_acquire.cold+0x20f/0x4a7 [ 53.007010] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.012565] ? number+0x957/0xc70 [ 53.016033] ? mark_held_locks+0x100/0x100 [ 53.020277] ? enable_ptr_key_workfn+0x30/0x30 [ 53.024860] ? find_held_lock+0x35/0x130 [ 53.028930] ? __lock_is_held+0xb6/0x140 [ 53.033002] ? rtnl_lock+0x17/0x20 [ 53.036548] lock_acquire+0x16f/0x3f0 [ 53.040352] ? rtnl_lock+0x17/0x20 [ 53.044242] ? rtnl_lock+0x17/0x20 [ 53.047787] __mutex_lock+0xf7/0x1300 [ 53.051594] ? rtnl_lock+0x17/0x20 [ 53.055148] ? trace_hardirqs_on+0x67/0x220 [ 53.059476] ? rtnl_lock+0x17/0x20 [ 53.063056] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.068609] ? full_name_hash+0xc0/0x100 [ 53.072689] ? mutex_trylock+0x1e0/0x1e0 [ 53.076761] ? memcpy+0x46/0x50 [ 53.080054] ? dev_alloc_name_ns+0x3ad/0x470 [ 53.084469] ? __dev_get_by_name+0x160/0x160 [ 53.088894] ? hsr_dev_close+0x10/0x10 [ 53.092786] mutex_lock_nested+0x16/0x20 [ 53.096863] ? mutex_lock_nested+0x16/0x20 [ 53.101112] rtnl_lock+0x17/0x20 [ 53.104487] hsr_dev_destroy+0x1f/0xc0 [ 53.108378] ? hsr_dev_close+0x10/0x10 [ 53.112276] register_netdevice+0xc3c/0xff0 [ 53.116616] ? netdev_change_features+0xb0/0xb0 [ 53.121290] ? hsr_get_max_mtu+0x1db/0x2b0 [ 53.125533] ? hsr_add_port+0x4c7/0x6b0 [ 53.129529] hsr_dev_finalize+0x4fc/0x780 [ 53.133685] hsr_newlink+0x26b/0x380 [ 53.137404] ? hsr_dev_finalize+0x780/0x780 [ 53.141732] ? rtnl_create_link+0x148/0xa00 [ 53.146056] ? netlink_ns_capable+0x26/0x30 [ 53.150385] ? hsr_dev_finalize+0x780/0x780 [ 53.154710] rtnl_newlink+0x1042/0x1600 [ 53.158701] ? rtnl_link_unregister+0x250/0x250 [ 53.163465] ? find_held_lock+0x35/0x130 [ 53.167540] ? is_bpf_text_address+0xac/0x170 [ 53.172051] ? __lock_acquire+0x6ee/0x49c0 [ 53.176291] ? __lock_acquire+0x6ee/0x49c0 [ 53.180534] ? mark_held_locks+0x100/0x100 [ 53.184776] ? mark_held_locks+0x100/0x100 [ 53.189023] ? __lock_acquire+0x6ee/0x49c0 [ 53.193264] ? avc_has_perm_noaudit+0x38f/0x570 [ 53.197940] ? __lock_acquire+0x6ee/0x49c0 [ 53.202184] ? mark_held_locks+0x100/0x100 [ 53.206422] ? avc_has_perm_noaudit+0x3b6/0x570 [ 53.211097] ? avc_has_extended_perms+0x10f0/0x10f0 [ 53.216121] ? avc_has_extended_perms+0x10f0/0x10f0 [ 53.221166] ? find_held_lock+0x35/0x130 [ 53.225231] ? rtnetlink_rcv_msg+0x3d0/0xb00 [ 53.229651] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 53.235191] ? rtnl_link_unregister+0x250/0x250 [ 53.239863] rtnetlink_rcv_msg+0x463/0xb00 [ 53.244103] ? rtnetlink_put_metrics+0x560/0x560 [ 53.248872] ? netlink_deliver_tap+0x22d/0xc20 [ 53.253474] ? find_held_lock+0x35/0x130 [ 53.257539] netlink_rcv_skb+0x17d/0x460 [ 53.261612] ? rtnetlink_put_metrics+0x560/0x560 [ 53.266388] ? netlink_ack+0xb30/0xb30 [ 53.270303] ? kasan_check_read+0x11/0x20 [ 53.274552] ? netlink_deliver_tap+0x254/0xc20 [ 53.279166] rtnetlink_rcv+0x1d/0x30 [ 53.282891] netlink_unicast+0x53a/0x730 [ 53.286959] ? netlink_attachskb+0x770/0x770 [ 53.291378] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.296929] netlink_sendmsg+0x8ae/0xd70 [ 53.300999] ? netlink_unicast+0x730/0x730 [ 53.305360] ? selinux_socket_sendmsg+0x36/0x40 [ 53.310021] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.315548] ? security_socket_sendmsg+0x8d/0xc0 [ 53.320315] ? netlink_unicast+0x730/0x730 [ 53.324536] sock_sendmsg+0xd7/0x130 [ 53.328235] ___sys_sendmsg+0x803/0x920 [ 53.332192] ? copy_msghdr_from_user+0x430/0x430 [ 53.336933] ? __might_fault+0x12b/0x1e0 [ 53.340979] ? __might_fault+0x12b/0x1e0 [ 53.345041] ? lock_downgrade+0x880/0x880 [ 53.349297] ? kasan_check_read+0x11/0x20 [ 53.353444] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.358972] ? __fget_light+0x1a9/0x230 [ 53.362942] ? __fdget+0x1b/0x20 [ 53.366319] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 53.371841] __sys_sendmsg+0x105/0x1d0 [ 53.375714] ? __ia32_sys_shutdown+0x80/0x80 [ 53.380119] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 53.384860] ? do_syscall_64+0x26/0x620 [ 53.388817] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.394161] ? do_syscall_64+0x26/0x620 [ 53.398119] __x64_sys_sendmsg+0x78/0xb0 [ 53.402188] do_syscall_64+0xfd/0x620 [ 53.405973] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.411144] RIP: 0033:0x4408e9 [ 53.414325] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 53.433217] RSP: 002b:00007ffe0b69f9b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 53.440914] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004408e9 [ 53.448170] RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000003 [ 53.455426] RBP: 00000000006cb018 R08: 0000000000000002 R09: 00000000004002c8 [ 53.462680] R10: 0000000000000014 R11: 0000000000000246 R12: 0000000000402170 [ 53.469933] R13: 0000000000402200 R14: 0000000000000000 R15: 0000000000000000