============================= WARNING: suspicious RCU usage 4.14.307-syzkaller #0 Not tainted ----------------------------- net/tipc/bearer.c:177 suspicious rcu_dereference_protected() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 2 locks held by syz-executor.1/10885: #0: (cb_lock){++++}, at: [] genl_rcv+0x15/0x40 net/netlink/genetlink.c:635 #1: (genl_mutex){+.+.}, at: [] genl_lock net/netlink/genetlink.c:33 [inline] #1: (genl_mutex){+.+.}, at: [] genl_rcv_msg+0x112/0x140 net/netlink/genetlink.c:623 stack backtrace: CPU: 0 PID: 10885 Comm: syz-executor.1 Not tainted 4.14.307-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 tipc_bearer_find+0x1ff/0x2f0 net/tipc/bearer.c:177 tipc_nl_compat_link_set+0x40b/0xb90 net/tipc/netlink_compat.c:807 __tipc_nl_compat_doit net/tipc/netlink_compat.c:316 [inline] tipc_nl_compat_doit+0x192/0x5d0 net/tipc/netlink_compat.c:364 tipc_nl_compat_handle net/tipc/netlink_compat.c:1215 [inline] tipc_nl_compat_recv+0xa0b/0xae0 net/tipc/netlink_compat.c:1297 genl_family_rcv_msg+0x572/0xb20 net/netlink/genetlink.c:600 genl_rcv_msg+0xaf/0x140 net/netlink/genetlink.c:625 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2461 genl_rcv+0x24/0x40 net/netlink/genetlink.c:636 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: 0033:0x7f408b1720f9 RSP: 002b:00007f40896e4168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f408b291f80 RCX: 00007f408b1720f9 RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000003 RBP: 00007f408b1cdae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffeb23ae3cf R14: 00007f40896e4300 R15: 0000000000022000 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 15 bytes leftover after parsing attributes in process `syz-executor.5'. EXT4-fs (loop1): Unrecognized mount option "Y{»jüÖ.hÌ8ÝK#f*½>;܃ô@Òinit_itable" or missing value EXT4-fs (loop1): Unrecognized mount option "Y{»jüÖ.hÌ8ÝK#f*½>;܃ô@Òinit_itable" or missing value netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 15 bytes leftover after parsing attributes in process `syz-executor.5'. EXT4-fs (loop1): Unrecognized mount option "Y{»jüÖ.hÌ8ÝK#f*½>;܃ô@Òinit_itable" or missing value netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 15 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 16 bytes leftover after parsing attributes in process `syz-executor.1'. FAT-fs (loop3): mounting with "discard" option, but the device does not support discard ip6_vti0: Invalid MTU 0 requested, hw min 1280 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.2'. process 'syz-executor.1' launched './file1' with NULL argv: empty string added audit: type=1326 audit(1678151862.661:2): auid=4294967295 uid=0 gid=0 ses=4294967295 pid=11356 comm="syz-executor.1" exe="/root/syz-executor.1" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f408b1720f9 code=0x0 audit: type=1326 audit(1678151862.751:3): auid=4294967295 uid=0 gid=0 ses=4294967295 pid=11393 comm="syz-executor.0" exe="/root/syz-executor.0" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f2b7d73c0f9 code=0x0 audit: type=1326 audit(1678151862.791:4): auid=4294967295 uid=0 gid=0 ses=4294967295 pid=11406 comm="syz-executor.3" exe="/root/syz-executor.3" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f6f0192e0f9 code=0x0 audit: type=1804 audit(1678151863.231:5): pid=11481 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir2998934603/syzkaller.drRZAU/136/file0" dev="sda1" ino=14137 res=1 ip6_vti0: Invalid MTU 536884160 requested, hw max 65495 audit: type=1326 audit(1678151864.131:6): auid=4294967295 uid=0 gid=0 ses=4294967295 pid=11635 comm="syz-executor.2" exe="/root/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fbb336480f9 code=0x0 audit: type=1326 audit(1678151864.821:7): auid=4294967295 uid=0 gid=0 ses=4294967295 pid=11742 comm="syz-executor.4" exe="/root/syz-executor.4" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f8b5088b0f9 code=0x0 capability: warning: `syz-executor.1' uses deprecated v2 capabilities in a way that may be insecure audit: type=1326 audit(1678151865.951:8): auid=4294967295 uid=0 gid=0 ses=4294967295 pid=11827 comm="syz-executor.0" exe="/root/syz-executor.0" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f2b7d73c0f9 code=0x0 FAT-fs (loop1): Unrecognized mount option "u+¯" or missing value audit: type=1326 audit(1678151867.311:9): auid=4294967295 uid=0 gid=0 ses=4294967295 pid=11955 comm="syz-executor.2" exe="/root/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fbb336480f9 code=0x0