netlink: 28 bytes leftover after parsing attributes in process `syz-executor.4'.
=============================
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.4/10157:
 #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

stack backtrace:
CPU: 1 PID: 10157 Comm: syz-executor.4 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: 0033:0x7f7763dab0f9
RSP: 002b:00007f776231d168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f7763ecaf80 RCX: 00007f7763dab0f9
RDX: 0000000000000000 RSI: 0000000020002980 RDI: 0000000000000003
RBP: 00007f7763e06ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd21683aef R14: 00007f776231d300 R15: 0000000000022000
BTRFS: device fsid 395ef67a-297e-477c-816d-cd80a5b93e5d devid 1 transid 8 /dev/loop5
BTRFS error (device loop5): unsupported checksum algorithm 2
BTRFS error (device loop5): superblock checksum mismatch
attempt to access beyond end of device
loop3: rw=0, want=1179668, limit=64
Buffer I/O error on dev loop3, logical block 589833, async page read
Trying to free block not in datazone
BTRFS error (device loop5): open_ctree failed
XFS (loop1): Superblock has unknown read-only compatible features (0x8) enabled.
XFS (loop1): Attempted to mount read-only compatible filesystem read-write.
XFS (loop1): Filesystem can only be safely mounted read only.
XFS (loop1): SB validate failed with error -22.
BTRFS: device fsid e417788f-7a09-42b2-9266-8ddc5d5d35d2 devid 1 transid 8 /dev/loop4
BTRFS error (device loop4): unsupported checksum algorithm 1
BTRFS error (device loop4): superblock checksum mismatch
BTRFS error (device loop4): open_ctree failed
audit: type=1800 audit(1677446322.900:7): pid=10177 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="bus" dev="sda1" ino=13988 res=0
EXT4-fs (loop3): mounting ext2 file system using the ext4 subsystem
EXT4-fs (loop3): failed to open journal device unknown-block(0,0): -6
F2FS-fs (loop0): invalid crc value
F2FS-fs (loop0): Found nat_bits in checkpoint
F2FS-fs (loop0): Mounted with checkpoint version = 48b305e4
BTRFS error (device loop4): unsupported checksum algorithm 2
BTRFS error (device loop4): superblock checksum mismatch
BTRFS error (device loop4): open_ctree failed
audit: type=1800 audit(1677446324.290:8): pid=10255 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="bus" dev="sda1" ino=14004 res=0
audit: type=1800 audit(1677446324.290:9): pid=10255 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="bus" dev="sda1" ino=14004 res=0
audit: type=1800 audit(1677446324.300:10): pid=10255 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="bus" dev="sda1" ino=14004 res=0
UDF-fs: warning (device loop4): udf_load_vrs: No VRS found
UDF-fs: Scanning with blocksize 512 failed
UDF-fs: error (device loop4): udf_read_tagged: tag checksum failed, block 112: 0xb2 != 0xba
UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000)
BTRFS error (device loop2): unsupported checksum algorithm 3
BTRFS error (device loop2): superblock checksum mismatch
BTRFS error (device loop2): open_ctree failed
ip6t_rpfilter: match only valid in the 'raw' or 'mangle' tables, not '
%w
='.
BTRFS error (device loop5): unsupported checksum algorithm 3
BTRFS error (device loop5): superblock checksum mismatch
XFS (loop3): Superblock has unknown read-only compatible features (0x8) enabled.
XFS (loop3): Attempted to mount read-only compatible filesystem read-write.
BTRFS error (device loop5): open_ctree failed
XFS (loop3): Filesystem can only be safely mounted read only.
XFS (loop3): SB validate failed with error -22.
BTRFS error (device loop5): unsupported checksum algorithm 3
BTRFS error (device loop5): superblock checksum mismatch
BTRFS error (device loop5): open_ctree failed
BTRFS error (device loop2): unsupported checksum algorithm 2
BTRFS error (device loop2): superblock checksum mismatch
BTRFS error (device loop2): open_ctree failed
audit: type=1800 audit(1677446326.760:11): pid=10377 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="bus" dev="sda1" ino=14017 res=0
audit: type=1800 audit(1677446326.780:12): pid=10377 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="bus" dev="sda1" ino=14017 res=0
audit: type=1800 audit(1677446326.790:13): pid=10377 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="bus" dev="sda1" ino=14017 res=0
F2FS-fs (loop0): invalid crc value
F2FS-fs (loop0): Found nat_bits in checkpoint
F2FS-fs (loop0): Mounted with checkpoint version = 48b305e4
capability: warning: `syz-executor.4' uses 32-bit capabilities (legacy support in use)
BTRFS error (device loop1): unsupported checksum algorithm 2
BTRFS error (device loop1): superblock checksum mismatch
BTRFS error (device loop1): open_ctree failed
audit: type=1800 audit(1677446327.730:14): pid=10473 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.1" name="bus" dev="sda1" ino=13985 res=0
audit: type=1800 audit(1677446327.730:15): pid=10473 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.1" name="bus" dev="sda1" ino=13985 res=0
audit: type=1800 audit(1677446327.730:16): pid=10473 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.1" name="bus" dev="sda1" ino=13985 res=0
syz-executor.5 uses obsolete (PF_INET,SOCK_PACKET)
sch_tbf: burst 3 is lower than device lo mtu (65550) !
sch_tbf: burst 0 is lower than device lo mtu (65550) !
L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details.
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1