netdev - Re: iw lockdep warning on wireless-testing

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date:	Tue, 24 Jun 2008 10:59:15 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Zhu Yi <yi.zhu@...el.com>
Cc:	linux-wireless@...r.kernel.org, Thomas Graf <tgraf@...g.ch>,
	netdev <netdev@...r.kernel.org>
Subject: Re: iw lockdep warning on wireless-testing

Hi,

> I begin to see below lockdep warning on wireless-testing when I use iw
> to create a monitor interface with iwl4965. Any clues?

Yeah I've seen that reported too, but I think it's in genetlink.

> =======================================================
> [ INFO: possible circular locking dependency detected ]
> 2.6.26-rc6-wl #57
> -------------------------------------------------------
> iw/2763 is trying to acquire lock:
>  (genl_mutex){--..}, at: [<ffffffff81216e4c>] ctrl_dumpfamily+0x31/0xf7
> 
> but task is already holding lock:
>  (nlk->cb_mutex){--..}, at: [<ffffffff812137c8>] netlink_dump+0x40/0x19d
> 
> which lock already depends on the new lock.

None of those is anything nl80211 has influence over, afaict.

> 
> the existing dependency chain (in reverse order) is:
> 
> -> #1 (nlk->cb_mutex){--..}:
>        [<ffffffff810518cb>] __lock_acquire+0xa4c/0xc28
>        [<ffffffff81215774>] netlink_dump_start+0xd9/0x169
>        [<ffffffff81051e5d>] lock_acquire+0x51/0x6c
>        [<ffffffff81215774>] netlink_dump_start+0xd9/0x169
>        [<ffffffff8104eab1>] debug_mutex_lock_common+0x16/0x23
>        [<ffffffff8127c622>] mutex_lock_nested+0xde/0x23f
>        [<ffffffff81215774>] netlink_dump_start+0xd9/0x169
>        [<ffffffff81216d7e>] genl_rcv_msg+0xae/0x14b
>        [<ffffffff8127c774>] mutex_lock_nested+0x230/0x23f
>        [<ffffffff81216cd0>] genl_rcv_msg+0x0/0x14b
>        [<ffffffff8121483a>] netlink_rcv_skb+0x34/0x7c
>        [<ffffffff81216fe1>] genl_rcv+0x21/0x30
>        [<ffffffff812145ec>] netlink_unicast+0x1f7/0x287
>        [<ffffffff811f7eb7>] __alloc_skb+0x84/0x132
>        [<ffffffff81214d60>] netlink_sendmsg+0x274/0x287
>        [<ffffffff811f1b49>] sock_sendmsg+0xe2/0xff
>        [<ffffffff8104582f>] autoremove_wake_function+0x0/0x2e
>        [<ffffffff81050878>] mark_held_locks+0x49/0x67
>        [<ffffffff811f1d7d>] sys_sendmsg+0x217/0x28a
>        [<ffffffff8107de49>] __do_fault+0x35d/0x3a5
>        [<ffffffff8100bf10>] tracesys+0xd5/0xda
>        [<ffffffffffffffff>] 0xffffffffffffffff
> 
> -> #0 (genl_mutex){--..}:
>        [<ffffffff81050226>] print_circular_bug_header+0xc8/0xcf
>        [<ffffffff810517d0>] __lock_acquire+0x951/0xc28
>        [<ffffffff81216e4c>] ctrl_dumpfamily+0x31/0xf7
>        [<ffffffff81051e5d>] lock_acquire+0x51/0x6c
>        [<ffffffff81216e4c>] ctrl_dumpfamily+0x31/0xf7
>        [<ffffffff8104eab1>] debug_mutex_lock_common+0x16/0x23
>        [<ffffffff8127c622>] mutex_lock_nested+0xde/0x23f
>        [<ffffffff81050a10>] trace_hardirqs_on+0xf3/0x117
>        [<ffffffff81216e4c>] ctrl_dumpfamily+0x31/0xf7
>        [<ffffffff812137e3>] netlink_dump+0x5b/0x19d
>        [<ffffffff81214ef3>] netlink_recvmsg+0x180/0x2a8
>        [<ffffffff811f1a48>] sock_recvmsg+0xf0/0x10f
>        [<ffffffff8104582f>] autoremove_wake_function+0x0/0x2e
>        [<ffffffff81050878>] mark_held_locks+0x49/0x67
>        [<ffffffff811f295c>] sys_recvmsg+0x15c/0x254
>        [<ffffffff81067ac3>] audit_syscall_entry+0x12d/0x160
>        [<ffffffff8127d6da>] trace_hardirqs_on_thunk+0x35/0x3a
>        [<ffffffff8100bf10>] tracesys+0xd5/0xda
>        [<ffffffffffffffff>] 0xffffffffffffffff
> 
> other info that might help us debug this:
> 
> 1 lock held by iw/2763:
>  #0:  (nlk->cb_mutex){--..}, at: [<ffffffff812137c8>] netlink_dump
> +0x40/0x19d
> 
> stack backtrace:
> Pid: 2763, comm: iw Not tainted 2.6.26-rc6-wl #57
> 
> Call Trace:
>  [<ffffffff8104fe63>] print_circular_bug_tail+0x69/0x72
>  [<ffffffff81050226>] print_circular_bug_header+0xc8/0xcf
>  [<ffffffff810517d0>] __lock_acquire+0x951/0xc28
>  [<ffffffff81216e4c>] ctrl_dumpfamily+0x31/0xf7
>  [<ffffffff81051e5d>] lock_acquire+0x51/0x6c
>  [<ffffffff81216e4c>] ctrl_dumpfamily+0x31/0xf7
>  [<ffffffff8104eab1>] debug_mutex_lock_common+0x16/0x23
>  [<ffffffff8127c622>] mutex_lock_nested+0xde/0x23f
>  [<ffffffff81050a10>] trace_hardirqs_on+0xf3/0x117
>  [<ffffffff81216e4c>] ctrl_dumpfamily+0x31/0xf7
>  [<ffffffff812137e3>] netlink_dump+0x5b/0x19d
>  [<ffffffff81214ef3>] netlink_recvmsg+0x180/0x2a8
>  [<ffffffff811f1a48>] sock_recvmsg+0xf0/0x10f
>  [<ffffffff8104582f>] autoremove_wake_function+0x0/0x2e
>  [<ffffffff81050878>] mark_held_locks+0x49/0x67
>  [<ffffffff811f295c>] sys_recvmsg+0x15c/0x254
>  [<ffffffff81067ac3>] audit_syscall_entry+0x12d/0x160
>  [<ffffffff8127d6da>] trace_hardirqs_on_thunk+0x35/0x3a
>  [<ffffffff8100bf10>] tracesys+0xd5/0xda
> 
> 
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-wireless" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 

Download attachment "signature.asc" of type "application/pgp-signature" (837 bytes)