Messages in this thread | | | Date | Sat, 11 Apr 2020 09:51:14 -0700 | Subject | WARNING: bad unlock balance in mptcp_poll | From | syzbot <> |
| |
Hello,
syzbot found the following crash on:
HEAD commit: ae46d2aa mm/gup: Let __get_user_pages_locked() return -EIN.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14fef69fe00000 kernel config: https://syzkaller.appspot.com/x/.config?x=ca75979eeebf06c2 dashboard link: https://syzkaller.appspot.com/bug?extid=e56606435b7bfeea8cf5 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=111ccd2be00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=162b0a77e00000
The bug was bisected to:
commit 59832e246515ab6a4f5aa878073e6f415aa35166 Author: Florian Westphal <fw@strlen.de> Date: Thu Apr 2 11:44:52 2020 +0000
mptcp: subflow: check parent mptcp socket on subflow state change
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14c1f69fe00000 final crash: https://syzkaller.appspot.com/x/report.txt?x=16c1f69fe00000 console output: https://syzkaller.appspot.com/x/log.txt?x=12c1f69fe00000
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+e56606435b7bfeea8cf5@syzkaller.appspotmail.com Fixes: 59832e246515 ("mptcp: subflow: check parent mptcp socket on subflow state change")
===================================== WARNING: bad unlock balance detected! 5.6.0-syzkaller #0 Not tainted ------------------------------------- syz-executor473/7733 is trying to release lock (sk_lock-AF_INET6) at: [<ffffffff87c51839>] mptcp_poll+0xb9/0x530 net/mptcp/protocol.c:1856 but there are no more locks to release!
other info that might help us debug this: 1 lock held by syz-executor473/7733: #0: ffff88808fe2f0a0 (slock-AF_INET6){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:358 [inline] #0: ffff88808fe2f0a0 (slock-AF_INET6){+...}-{2:2}, at: release_sock+0x1b/0x1b0 net/core/sock.c:2974
stack backtrace: CPU: 0 PID: 7733 Comm: syz-executor473 Not tainted 5.6.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 __lock_release kernel/locking/lockdep.c:4633 [inline] lock_release+0x586/0x800 kernel/locking/lockdep.c:4941 sock_release_ownership include/net/sock.h:1539 [inline] release_sock+0x177/0x1b0 net/core/sock.c:2984 mptcp_poll+0xb9/0x530 net/mptcp/protocol.c:1856 sock_poll+0x15c/0x470 net/socket.c:1271 vfs_poll include/linux/poll.h:90 [inline] do_pollfd fs/select.c:859 [inline] do_poll fs/select.c:907 [inline] do_sys_poll+0x63c/0xdd0 fs/select.c:1001 __do_sys_ppoll fs/select.c:1101 [inline] __se_sys_ppoll fs/select.c:1081 [inline] __x64_sys_ppoll+0x210/0x280 fs/select.c:1081 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x441219 Code: e8 fc ab 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 9b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fff9deb18e8 EFLAGS: 00000246 ORIG_RAX: 000000000000010f RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441219 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000020000080 RBP: 000000000000f233 R08: 3f00000000000000 R09: 00000000004002c8 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402040 R13: 00000000004020d0 R14: 0000000000000000 R15: 0000000000000000
--- 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@googlegroups.com.
syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches
| |