On Sun, Dec 15, 2019 at 12:35:09PM -0800, syzbot wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: e31736d9 Merge tag 'nios2-v5.5-rc2' of git://git.kernel.or.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=126a177ee00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=bbf3a35184a3ed64 > dashboard link: https://syzkaller.appspot.com/bug?extid=772d9e36c490b18d51d1 > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15602ddee00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12798251e00000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+772d9e36c490b18d51d1@xxxxxxxxxxxxxxxxxxxxxxxxx > > BUG: memory leak > unreferenced object 0xffff8881080a3000 (size 4096): > comm "syz-executor474", pid 7155, jiffies 4294942658 (age 15.870s) > hex dump (first 32 bytes): > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > backtrace: > [<00000000df094087>] genradix_alloc_node lib/generic-radix-tree.c:90 > [inline] > [<00000000df094087>] __genradix_ptr_alloc+0xf5/0x250 > lib/generic-radix-tree.c:122 > [<0000000057cfa7bb>] __genradix_prealloc+0x46/0x70 > lib/generic-radix-tree.c:223 > [<0000000029d02dac>] sctp_stream_alloc_out.part.0+0x57/0x80 > net/sctp/stream.c:86 > [<00000000bb930a04>] sctp_stream_alloc_out net/sctp/stream.c:151 > [inline] > [<00000000bb930a04>] sctp_stream_init+0x129/0x180 net/sctp/stream.c:129 > [<00000000ba13c246>] sctp_association_init net/sctp/associola.c:229 > [inline] > [<00000000ba13c246>] sctp_association_new+0x46e/0x700 > net/sctp/associola.c:295 > [<000000008eb57b4d>] sctp_connect_new_asoc+0x90/0x220 > net/sctp/socket.c:1070 > [<00000000ea24e048>] __sctp_connect+0x182/0x3b0 net/sctp/socket.c:1176 > [<00000000aa2c530a>] __sctp_setsockopt_connectx+0xa9/0xf0 > net/sctp/socket.c:1322 > [<0000000018934bfd>] sctp_getsockopt_connectx3 net/sctp/socket.c:1407 > [inline] > [<0000000018934bfd>] sctp_getsockopt net/sctp/socket.c:8079 [inline] > [<0000000018934bfd>] sctp_getsockopt+0x1394/0x32f6 > net/sctp/socket.c:8010 > [<000000005fd7e3c8>] sock_common_getsockopt+0x38/0x50 > net/core/sock.c:3108 > [<00000000333baf72>] __sys_getsockopt+0xa8/0x180 net/socket.c:2162 > [<00000000de0f98e4>] __do_sys_getsockopt net/socket.c:2177 [inline] > [<00000000de0f98e4>] __se_sys_getsockopt net/socket.c:2174 [inline] > [<00000000de0f98e4>] __x64_sys_getsockopt+0x26/0x30 net/socket.c:2174 > [<00000000cf1dfee9>] do_syscall_64+0x73/0x220 > arch/x86/entry/common.c:294 > [<000000000f416860>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 > Almost looks like we're processing a connectx socket option while the handling of a cookie echo chunk is in flight through the state machine (i.e. sctp_stream_update is getting called on the association while we're setting it up in parallel), though I'm not sure how that can happen Neil > > > --- > This bug is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this bug report. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > syzbot can test patches for this bug, for details see: > https://goo.gl/tpsmEJ#testing-patches >
