============================= WARNING: suspicious RCU usage audit: type=1804 audit(1677342585.594:40): pid=11163 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.5" name="/root/syzkaller-testdir1798787238/syzkaller.cqD7tI/44/file0/bus" dev="loop5" ino=43 res=1 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.0/11310: #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: 11310 Comm: syz-executor.0 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: 0033:0x7fcc85be90f9 RSP: 002b:00007fcc8415b168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fcc85d08f80 RCX: 00007fcc85be90f9 RDX: 0000000000000000 RSI: 0000000020002980 RDI: 0000000000000004 RBP: 00007fcc85c44ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe2e8e3bbf R14: 00007fcc8415b300 R15: 0000000000022000 XFS (loop4): Mounting V4 Filesystem XFS (loop1): Mounting V4 Filesystem XFS (loop4): Ending clean mount XFS (loop1): Ending clean mount XFS (loop4): Unmounting Filesystem XFS (loop1): Unmounting Filesystem hfsplus: unable to find HFS+ superblock hfsplus: unable to find HFS+ superblock hfsplus: bad catalog entry type hfsplus: unable to find HFS+ superblock unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 hfsplus: bad catalog entry type hfsplus: bad catalog entry type hfsplus: bad catalog entry type BTRFS: device fsid 395ef67a-297e-477c-816d-cd80a5b93e5d devid 1 transid 8 /dev/loop0 BTRFS error (device loop0): unsupported checksum algorithm 2 BTRFS error (device loop0): superblock checksum mismatch BTRFS error (device loop0): open_ctree failed print_req_error: I/O error, dev loop0, sector 0 kauditd_printk_skb: 2 callbacks suppressed audit: type=1804 audit(1677342594.795:43): pid=11674 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir3420092928/syzkaller.lIXOox/55/file0/bus" dev="loop4" ino=7 res=1 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off. netlink: 64 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'. 9pnet: Could not find request transport: xen netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'. overlayfs: fs on 'file0' does not support file handles, falling back to index=off. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off. netlink: 64 bytes leftover after parsing attributes in process `syz-executor.4'. 9pnet: Could not find request transport: xen overlayfs: fs on './file0' does not support file handles, falling back to index=off. 9pnet: Could not find request transport: xen netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. overlayfs: fs on 'file0' does not support file handles, falling back to index=off. netlink: 64 bytes leftover after parsing attributes in process `syz-executor.4'. overlayfs: fs on './file0' does not support file handles, falling back to index=off. 9pnet: Could not find request transport: xen netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: fs on 'file0' does not support file handles, falling back to index=off. netlink: 64 bytes leftover after parsing attributes in process `syz-executor.4'. overlayfs: fs on './file0' does not support file handles, falling back to index=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off. 9pnet: Could not find request transport: xen 9pnet: Could not find request transport: xen overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off. 9pnet: Could not find request transport: xen audit: type=1800 audit(1677342597.975:44): pid=11855 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="file0" dev="sda1" ino=14128 res=0 audit: type=1804 audit(1677342597.985:45): pid=11855 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir1798787238/syzkaller.cqD7tI/65/file0" dev="sda1" ino=14128 res=1 audit: type=1804 audit(1677342597.995:46): pid=11855 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.5" name="/root/syzkaller-testdir1798787238/syzkaller.cqD7tI/65/file0" dev="sda1" ino=14128 res=1 audit: type=1800 audit(1677342598.905:47): pid=11890 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="file0" dev="sda1" ino=14120 res=0