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  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:	Wed, 14 Feb 2007 13:27:29 -0800
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Francois Romieu <romieu@...zoreil.com>
Cc:	netdev@...r.kernel.org, Ben Greear <greearb@...delatech.com>,
	Kyle Lucke <klucke@...ibm.com>,
	Raghavendra Koushik <raghavendra.koushik@...erion.com>,
	Al Viro <viro@....linux.org.uk>
Subject: [BUG] RTNL and flush_scheduled_work deadlocks

Ben found this but the problem seems pretty widespread.

The following places are subject to deadlock between flush_scheduled_work
and the RTNL mutex. What can happen is that a work queue routine (like
bridge port_carrier_check) is waiting forever for RTNL, and the driver
routine has called flush_scheduled_work with RTNL held and is waiting
for the work queue to clear.

Several other places have comments like: "can't call flush_scheduled_work
here or it will deadlock". Most of the problem places are in device close
routine. My recommendation would be to add a check for device netif_running in
what ever work routine is used, and move the flush_scheduled_work to the
remove routine.

8139too.c: rtl8139_close --> rtl8139_stop_thread
r8169.c:   rtl8169_down
cassini.c: cas_change_mtu
iseries_veth.c: veth_stop_connection
s2io.c: s2io_close
sis190.c: sis190_down


-
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Powered by blists - more mailing lists