=============================
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.5/12203:
 #0:  (rtnl_mutex){+.+.}, at: [<ffffffff85c8dcdd>] rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0:  (rtnl_mutex){+.+.}, at: [<ffffffff85c8dcdd>] rtnetlink_rcv_msg+0x31d/0xb10 net/core/rtnetlink.c:4317
REISERFS (device loop0): found reiserfs format "3.6" with non-standard journal

stack backtrace:
REISERFS (device loop0): using ordered data mode
reiserfs: using flush barriers
CPU: 0 PID: 12203 Comm: syz-executor.5 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: 0033:0x7fd364e840f9
RSP: 002b:00007fd3633f6168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fd364fa3f80 RCX: 00007fd364e840f9
RDX: 0000000000000000 RSI: 0000000020002980 RDI: 0000000000000004
RBP: 00007fd364edfae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe656689ff R14: 00007fd3633f6300 R15: 0000000000022000
REISERFS (device loop0): journal params: device loop0, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30
REISERFS (device loop0): checking transaction log (loop0)
REISERFS (device loop0): Using r5 hash to sort names
REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage.
team0: Port device ipvlan1 added
syz-executor.3 (12291) used greatest stack depth: 24328 bytes left
REISERFS (device loop0): found reiserfs format "3.6" with non-standard journal
REISERFS (device loop0): using ordered data mode
reiserfs: using flush barriers
REISERFS (device loop0): journal params: device loop0, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30
REISERFS (device loop0): checking transaction log (loop0)
REISERFS (device loop0): Using r5 hash to sort names
REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage.
team0: Port device ipvlan1 added
team0: Port device ipvlan1 added
REISERFS (device loop0): found reiserfs format "3.6" with non-standard journal
REISERFS (device loop0): using ordered data mode
reiserfs: using flush barriers
REISERFS (device loop0): journal params: device loop0, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30
REISERFS (device loop0): checking transaction log (loop0)
REISERFS (device loop0): Using r5 hash to sort names
REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage.
NILFS (loop4): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
REISERFS (device loop0): found reiserfs format "3.6" with non-standard journal
REISERFS (device loop0): using ordered data mode
reiserfs: using flush barriers
REISERFS (device loop0): journal params: device loop0, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30
REISERFS (device loop0): checking transaction log (loop0)
REISERFS (device loop0): Using r5 hash to sort names
REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage.
EXT4-fs (loop4): Unrecognized mount option "00000000000000000000000" or missing value
xt_conntrack: cannot load conntrack support for proto=2
usb usb9: usbfs: interface 0 claimed by usbfs while 'syz-executor.1' sets config #1
xt_conntrack: cannot load conntrack support for proto=2
EXT4-fs (loop4): Unrecognized mount option "00000000000000000000000" or missing value
hub 9-0:1.0: USB hub found
hub 9-0:1.0: 8 ports detected
xt_conntrack: cannot load conntrack support for proto=2
usb usb9: usbfs: interface 0 claimed by hub while 'syz-executor.2' sets config #0
usb usb9: usbfs: interface 0 claimed by hub while 'syz-executor.5' sets config #0
xt_conntrack: cannot load conntrack support for proto=2
EXT4-fs (loop4): Unrecognized mount option "00000000000000000000000" or missing value
hub 9-0:1.0: USB hub found
hub 9-0:1.0: 8 ports detected
EXT4-fs (loop4): Unrecognized mount option "00000000000000000000000" or missing value
usb usb9: usbfs: interface 0 claimed by hub while 'syz-executor.2' sets config #0
usb usb9: usbfs: interface 0 claimed by usbfs while 'syz-executor.5' sets config #0
usb usb9: usbfs: interface 0 claimed by usbfs while 'syz-executor.5' sets config #1
usb usb9: usbfs: interface 0 claimed by usbfs while 'syz-executor.1' sets config #1
hub 9-0:1.0: USB hub found
hub 9-0:1.0: 8 ports detected