[ 38.875211][ T26] audit: type=1800 audit(1552925318.070:26): pid=7760 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 38.900713][ T26] audit: type=1800 audit(1552925318.070:27): pid=7760 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 38.933172][ T26] audit: type=1800 audit(1552925318.070:28): pid=7760 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 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. [ 39.918951][ T26] audit: type=1800 audit(1552925319.140:29): pid=7760 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.250' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 49.764115][ T7913] [ 49.766557][ T7913] ============================= [ 49.771495][ T7913] WARNING: suspicious RCU usage [ 49.776414][ T7913] 5.1.0-rc1-next-20190318 #5 Not tainted [ 49.782165][ T7913] ----------------------------- [ 49.787022][ T7913] net/xfrm/xfrm_user.c:1080 suspicious rcu_dereference_check() usage! [ 49.795596][ T7913] [ 49.795596][ T7913] other info that might help us debug this: [ 49.795596][ T7913] [ 49.805932][ T7913] [ 49.805932][ T7913] rcu_scheduler_active = 2, debug_locks = 1 [ 49.814040][ T7913] 1 lock held by syz-executor501/7913: [ 49.819596][ T7913] #0: 0000000071883b7f (&net->xfrm.xfrm_cfg_mutex){+.+.}, at: xfrm_netlink_rcv+0x61/0x90 [ 49.829572][ T7913] [ 49.829572][ T7913] stack backtrace: [ 49.835458][ T7913] CPU: 1 PID: 7913 Comm: syz-executor501 Not tainted 5.1.0-rc1-next-20190318 #5 [ 49.844475][ T7913] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.854526][ T7913] Call Trace: [ 49.857811][ T7913] dump_stack+0x172/0x1f0 [ 49.862220][ T7913] lockdep_rcu_suspicious+0x153/0x15d [ 49.867600][ T7913] xfrm_get_sadinfo+0x57b/0x650 [ 49.872467][ T7913] ? xfrm_send_mapping+0xb20/0xb20 [ 49.877614][ T7913] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.883877][ T7913] ? __nla_parse+0x12a/0x340 [ 49.888468][ T7913] ? nla_parse+0x45/0x60 [ 49.892701][ T7913] ? xfrm_send_mapping+0xb20/0xb20 [ 49.897803][ T7913] xfrm_user_rcv_msg+0x458/0x770 [ 49.902914][ T7913] ? xfrm_dump_sa_done+0xf0/0xf0 [ 49.908525][ T7913] ? mark_held_locks+0xf0/0xf0 [ 49.913291][ T7913] ? save_stack+0xa9/0xd0 [ 49.917616][ T7913] ? __mutex_lock+0x3cd/0x1310 [ 49.922417][ T7913] ? xfrm_netlink_rcv+0x61/0x90 [ 49.927364][ T7913] netlink_rcv_skb+0x17a/0x460 [ 49.932121][ T7913] ? xfrm_dump_sa_done+0xf0/0xf0 [ 49.937052][ T7913] ? netlink_ack+0xb50/0xb50 [ 49.941646][ T7913] xfrm_netlink_rcv+0x70/0x90 [ 49.946309][ T7913] netlink_unicast+0x536/0x720 [ 49.951222][ T7913] ? netlink_attachskb+0x770/0x770 [ 49.956327][ T7913] ? _copy_from_iter_full+0x259/0x8f0 [ 49.961690][ T7913] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 49.967399][ T7913] ? __check_object_size+0x3d/0x42f [ 49.972740][ T7913] netlink_sendmsg+0x8ae/0xd70 [ 49.977498][ T7913] ? netlink_unicast+0x720/0x720 [ 49.982469][ T7913] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 49.988802][ T7913] ? apparmor_socket_sendmsg+0x2a/0x30 [ 49.994259][ T7913] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.000583][ T7913] ? security_socket_sendmsg+0x93/0xc0 [ 50.006032][ T7913] ? netlink_unicast+0x720/0x720 [ 50.011256][ T7913] sock_sendmsg+0xdd/0x130 [ 50.015684][ T7913] ___sys_sendmsg+0x806/0x930 [ 50.020367][ T7913] ? copy_msghdr_from_user+0x430/0x430 [ 50.025949][ T7913] ? __thp_get_unmapped_area+0x190/0x190 [ 50.031577][ T7913] ? __lock_acquire+0x548/0x3fb0 [ 50.036531][ T7913] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.042863][ T7913] ? __handle_mm_fault+0x7cd/0x3ec0 [ 50.048149][ T7913] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.054428][ T7913] ? __fget_light+0x1a9/0x230 [ 50.059156][ T7913] ? __fdget+0x1b/0x20 [ 50.063255][ T7913] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 50.069501][ T7913] __sys_sendmsg+0x105/0x1d0 [ 50.074097][ T7913] ? __ia32_sys_shutdown+0x80/0x80 [ 50.079215][ T7913] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 50.085017][ T7913] ? do_syscall_64+0x26/0x610 [ 50.089690][ T7913] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 50.095865][ T7913] ? do_syscall_64+0x26/0x610 [ 50.100621][ T7913] __x64_sys_sendmsg+0x78/0xb0 [ 50.105385][ T7913] do_syscall_64+0x103/0x610 [ 50.110785][ T7913] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 50.116668][ T7913] RIP: 0033:0x4401d9 [ 50.120550][ T7913] 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 [ 50.140355][ T7913] RSP: 002b:00007ffe965c5678 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 50.148988][ T7913] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401d9 [ 50.157217][ T7913] RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003 [ 50.1