netlink: 28 bytes leftover after parsing attributes in process `syz-executor.3'. ============================= WARNING: suspicious RCU usage 4.14.307-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-executor.3/9918: #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:4317 stack backtrace: CPU: 1 PID: 9918 Comm: syz-executor.3 Not tainted 4.14.307-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 tcf_sample_init+0x71c/0x8c0 net/sched/act_sample.c:95 tcf_action_init_1+0x51a/0x9e0 net/sched/act_api.c:691 tcf_action_init+0x26d/0x400 net/sched/act_api.c:760 tcf_action_add net/sched/act_api.c:1088 [inline] tc_ctl_action+0x2e3/0x510 net/sched/act_api.c:1140 rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4322 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2461 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1328 netlink_sendmsg+0x651/0xbc0 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062 __sys_sendmsg+0xa3/0x120 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x27/0x40 net/socket.c:2103 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 RIP: 0033:0x7fb4f8d6b0f9 RSP: 002b:00007fb4f72dd168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fb4f8e8af80 RCX: 00007fb4f8d6b0f9 RDX: 0000000000000000 RSI: 0000000020002980 RDI: 0000000000000004 RBP: 00007fb4f8dc6ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffb5e3d83f R14: 00007fb4f72dd300 R15: 0000000000022000 netlink: 28 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 28 bytes leftover after parsing attributes in process `syz-executor.3'. syz-executor.2 (9972) used greatest stack depth: 24176 bytes left TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. netlink: 28 bytes leftover after parsing attributes in process `syz-executor.3'. TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. EXT4-fs (loop4): DAX enabled. Warning: EXPERIMENTAL, use at your own risk EXT4-fs (loop4): Cannot use DAX on a filesystem that may contain inline data TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. EXT4-fs (loop4): DAX enabled. Warning: EXPERIMENTAL, use at your own risk EXT4-fs (loop4): Cannot use DAX on a filesystem that may contain inline data TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. audit: type=1800 audit(1677703374.237:2): pid=10059 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="file0" dev="sda1" ino=13907 res=0 EXT4-fs (loop4): DAX enabled. Warning: EXPERIMENTAL, use at your own risk audit: type=1804 audit(1677703374.247:3): pid=10059 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir976406781/syzkaller.5yYBFm/24/file0" dev="sda1" ino=13907 res=1 EXT4-fs (loop4): Cannot use DAX on a filesystem that may contain inline data EXT4-fs (loop4): DAX enabled. Warning: EXPERIMENTAL, use at your own risk EXT4-fs (loop4): Cannot use DAX on a filesystem that may contain inline data audit: type=1800 audit(1677703375.127:4): pid=10102 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="file0" dev="sda1" ino=13905 res=0 audit: type=1804 audit(1677703375.147:5): pid=10102 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir976406781/syzkaller.5yYBFm/25/file0" dev="sda1" ino=13905 res=1 audit: type=1800 audit(1677703376.047:6): pid=10122 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="file0" dev="sda1" ino=13955 res=0 audit: type=1800 audit(1677703376.197:7): pid=10121 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="file0" dev="sda1" ino=13956 res=0 audit: type=1804 audit(1677703376.197:8): pid=10122 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir707858070/syzkaller.wg7AO9/12/file0" dev="sda1" ino=13955 res=1 unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 audit: type=1804 audit(1677703376.607:9): pid=10123 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir3740201043/syzkaller.um5Yvs/22/file0" dev="sda1" ino=13956 res=1 audit: type=1800 audit(1677703378.598:10): pid=10143 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="file0" dev="sda1" ino=13962 res=0 audit: type=1800 audit(1677703378.598:11): pid=10144 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="file0" dev="sda1" ino=13963 res=0 audit: type=1800 audit(1677703379.098:12): pid=10145 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.0" name="file0" dev="sda1" ino=13964 res=0