audit: type=1400 audit(1593733657.604:8): avc: denied { execmem } for pid=6335 comm="syz-executor996" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 IPVS: ftp: loaded support on port[0] = 21 ============================= WARNING: suspicious RCU usage 4.14.184-syzkaller #0 Not tainted ----------------------------- net/sched/act_sample.c:95 suspicious rcu_dereference_protected() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 1 lock held by syz-executor996/6336: #0: (rtnl_mutex){+.+.}, at: [] rtnl_lock net/core/rtnetlink.c:72 [inline] #0: (rtnl_mutex){+.+.}, at: [] rtnetlink_rcv_msg+0x31d/0xb10 net/core/rtnetlink.c:4310 stack backtrace: CPU: 0 PID: 6336 Comm: syz-executor996 Not tainted 4.14.184-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x283 lib/dump_stack.c:58 tcf_sample_init+0x71c/0x8c0 net/sched/act_sample.c:95 tcf_action_init_1+0x51a/0x9f0 net/sched/act_api.c:682 tcf_action_init+0x26d/0x400 net/sched/act_api.c:751 tcf_exts_validate+0x2d7/0x490 net/sched/cls_api.c:926 basic_set_parms net/sched/cls_basic.c:154 [inline] basic_change+0x3ef/0xf00 net/sched/cls_basic.c:222 tc_ctl_tfilter+0xf13/0x18e7 net/sched/cls_api.c:738 rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4315 netlink_rcv_skb+0x127/0x370 net/netlink/af_netlink.c:2433 netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline] netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1313 netlink_sendmsg+0x64a/0xbb0 net/netlink/af_netlink.c:1878 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 ___sys_sendmsg+0x349/0x840 net/socket.c:2062 __sys_sendmmsg+0x129/0x330 net/socket.c:2152 SYSC_sendmmsg net/socket.c:2183 [inline] SyS_sendmmsg+0x2f/0x50 net/socket.c:2178 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x440e99 RSP: 002b:00007ffe64ca8b18 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00000000004a2670 RCX: 0000000000440e99 RDX: 010efe10675dec16 RSI: 0000000020000200 RDI: 0000000000000003 RBP: 00007ffe64ca8b20 R08: 0000000120080522 R09: 0000000120080522 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a2670 R13: 0000000000402430 R14: 0000000000000000 R15: 0000000000000000