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: [] 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: 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