audit: type=1804 audit(1677071147.819:2112): pid=13820 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir1182605339/syzkaller.HOnwNi/148/bus" dev="sda1" ino=14225 res=1 ============================= WARNING: suspicious RCU usage audit: type=1804 audit(1677071147.859:2113): pid=13820 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.1" name="/root/syzkaller-testdir1182605339/syzkaller.HOnwNi/148/bus" dev="sda1" ino=14225 res=1 4.14.306-syzkaller #0 Not tainted ----------------------------- net/sched/act_sample.c:95 suspicious rcu_dereference_protected() usage! other info that might help us debug this: audit: type=1804 audit(1677071147.939:2114): pid=13824 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir2178350763/syzkaller.ECJwVC/158/bus" dev="sda1" ino=14462 res=1 rcu_scheduler_active = 2, debug_locks = 1 1 lock held by syz-executor.3/13818: #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: 0 PID: 13818 Comm: syz-executor.3 Not tainted 4.14.306-syzkaller #0 audit: type=1804 audit(1677071147.939:2115): pid=13825 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir1182605339/syzkaller.HOnwNi/148/bus" dev="sda1" ino=14225 res=1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 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: 0033:0x7f57bd5ba0f9 RSP: 002b:00007f57bbb2c168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f57bd6d9f80 RCX: 00007f57bd5ba0f9 RDX: 0000000000000000 RSI: 0000000020002980 RDI: 0000000000000004 RBP: 00007f57bd615ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd6c872f9f R14: 00007f57bbb2c300 R15: 0000000000022000 audit: type=1804 audit(1677071148.419:2116): pid=13838 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir1182605339/syzkaller.HOnwNi/149/bus" dev="sda1" ino=13883 res=1 audit: type=1804 audit(1677071148.419:2117): pid=13838 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.1" name="/root/syzkaller-testdir1182605339/syzkaller.HOnwNi/149/bus" dev="sda1" ino=13883 res=1 audit: type=1804 audit(1677071148.499:2118): pid=13845 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir1182605339/syzkaller.HOnwNi/149/bus" dev="sda1" ino=13883 res=1 audit: type=1804 audit(1677071148.539:2119): pid=13841 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir2178350763/syzkaller.ECJwVC/159/bus" dev="sda1" ino=14500 res=1 audit: type=1804 audit(1677071148.769:2120): pid=13854 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir2178350763/syzkaller.ECJwVC/160/bus" dev="sda1" ino=14461 res=1 audit: type=1804 audit(1677071149.769:2121): pid=13871 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir1182605339/syzkaller.HOnwNi/150/bus" dev="sda1" ino=14519 res=1 unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1