audit: type=1800 audit(1677677113.918:77): pid=14475 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="bus" dev="sda1" ino=14164 res=0 netlink: 28 bytes leftover after parsing attributes in process `syz-executor.2'. ============================= WARNING: suspicious RCU usage audit: type=1800 audit(1677677114.158:78): pid=14493 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="bus" dev="sda1" ino=14164 res=0 4.14.307-syzkaller #0 Not tainted ----------------------------- IPVS: ftp: loaded support on port[0] = 21 net/sched/act_sample.c:95 suspicious rcu_dereference_protected() usage! other info that might help us debug this: input: syz0 as /devices/virtual/input/input9 rcu_scheduler_active = 2, debug_locks = 1 1 lock held by syz-executor.2/14476: #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: 14476 Comm: syz-executor.2 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: 0033:0x7f334de0b0f9 RSP: 002b:00007f334c37d168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f334df2af80 RCX: 00007f334de0b0f9 RDX: 0000000000000000 RSI: 0000000020002980 RDI: 0000000000000004 RBP: 00007f334de66ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff0b6b742f R14: 00007f334c37d300 R15: 0000000000022000 IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready netlink: 28 bytes leftover after parsing attributes in process `syz-executor.2'. audit: type=1800 audit(1677677115.168:79): pid=14549 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="bus" dev="sda1" ino=13972 res=0 audit: type=1800 audit(1677677115.378:80): pid=14564 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="bus" dev="sda1" ino=13972 res=0 netlink: 28 bytes leftover after parsing attributes in process `syz-executor.2'. EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue audit: type=1800 audit(1677677115.888:81): pid=14602 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="bus" dev="sda1" ino=14518 res=0 IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready audit: type=1800 audit(1677677116.118:82): pid=14618 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="bus" dev="sda1" ino=14518 res=0 IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue netlink: 28 bytes leftover after parsing attributes in process `syz-executor.2'. EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue 9pnet: p9_fd_create_unix (14651): problem connecting socket: ./file0: -111 NILFS (loop4): invalid segment: Checksum error in segment payload NILFS (loop4): trying rollback from an earlier position netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. NILFS (loop4): recovery complete NILFS (loop4): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds overlayfs: fs on 'file0' does not support file handles, falling back to index=off. Zero length message leads to an empty skb 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.0'. NILFS (loop4): invalid segment: Checksum error in segment payload NILFS (loop4): trying rollback from an earlier position NILFS (loop4): recovery complete NILFS (loop4): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. NILFS (loop4): invalid segment: Checksum error in segment payload NILFS (loop4): trying rollback from an earlier position netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. NILFS (loop4): recovery complete overlayfs: fs on 'file0' does not support file handles, falling back to index=off. NILFS (loop4): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds 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. 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. NILFS (loop4): invalid segment: Checksum error in segment payload NILFS (loop4): trying rollback from an earlier position NILFS (loop4): recovery complete NILFS (loop4): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds 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. hfsplus: request for non-existent node 16715520 in B*Tree hfsplus: request for non-existent node 16715520 in B*Tree 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. hfsplus: request for non-existent node 16715520 in B*Tree hfsplus: request for non-existent node 16715520 in B*Tree hfsplus: request for non-existent node 16715520 in B*Tree hfsplus: request for non-existent node 16715520 in B*Tree hfsplus: b-tree write err: -5, ino 4 overlayfs: fs on './file0' does not support file handles, falling back to index=off. hfsplus: request for non-existent node 16715520 in B*Tree hfsplus: request for non-existent node 16715520 in B*Tree overlayfs: fs on 'file0' does not support file handles, falling back to index=off. hfsplus: request for non-existent node 16715520 in B*Tree hfsplus: request for non-existent node 16715520 in B*Tree hfsplus: request for non-existent node 16715520 in B*Tree hfsplus: request for non-existent node 16715520 in B*Tree overlayfs: fs on './file0' does not support file handles, falling back to index=off. hfsplus: b-tree write err: -5, ino 4 hfsplus: request for non-existent node 16715520 in B*Tree hfsplus: request for non-existent node 16715520 in B*Tree hfsplus: request for non-existent node 16715520 in B*Tree hfsplus: request for non-existent node 16715520 in B*Tree hfsplus: request for non-existent node 16715520 in B*Tree hfsplus: request for non-existent node 16715520 in B*Tree hfsplus: b-tree write err: -5, ino 4 hfsplus: request for non-existent node 16715520 in B*Tree hfsplus: request for non-existent node 16715520 in B*Tree hfsplus: request for non-existent node 16715520 in B*Tree hfsplus: request for non-existent node 16715520 in B*Tree hfsplus: request for non-existent node 16715520 in B*Tree hfsplus: request for non-existent node 16715520 in B*Tree hfsplus: b-tree write err: -5, ino 4