Re: 2.6.22-rc3-mm1 - pppd hanging in netdev_run_todo while holding mutex

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From: Andrew Morton

Subject: Re: 2.6.22-rc3-mm1 - pppd hanging in netdev_run_todo while holding mutex

Date: Tuesday, June 5, 2007 - 11:14 pm

On Mon, 04 Jun 2007 14:00:56 -0400 Valdis.Kletnieks@vt.edu wrote:

quoted text> On Wed, 30 May 2007 23:58:23 PDT, Andrew Morton said:
> > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.22-rc3/2.6.22-rc3-mm1/
> 
> Under 22-rc2-mm1, if my VPN connection got reset, ppp0 just quietly went away.
> 
> Under 22-rc3-mm1, it seems to end up wedged and waiting for references to
> go away:
> 
> Jun  4 09:23:01 turing-police kernel: [90089.270707] unregister_netdevice: waiting for ppp0 to become free. Usage count = 8
> Jun  4 09:23:11 turing-police kernel: [90099.396121] unregister_netdevice: waiting for ppp0 to become free. Usage count = 8
> Jun  4 09:23:21 turing-police kernel: [90109.520574] unregister_netdevice: waiting for ppp0 to become free. Usage count = 8
> Jun  4 09:23:32 turing-police kernel: [90119.653129] unregister_netdevice: waiting for ppp0 to become free. Usage count = 8

Interesting refcount.

quoted text> 'echo t > /proc/sysrq_trigger' shows pppd hung up here:
> 
> Jun  4 10:52:57 turing-police kernel: [95478.047892] pppd          D 0000000105ad3830  4968  3815      1 (NOTLB)
> Jun  4 10:52:57 turing-police kernel: [95478.047902]  ffff810008d5fd78 0000000000000086 0000000000000000 ffff810003490000
> Jun  4 10:52:57 turing-police kernel: [95478.047911]  ffff810008d5fd28 ffff810008d4a040 ffff810003461820 ffff810008d4a2b0
> Jun  4 10:52:57 turing-police kernel: [95478.047920]  0000000105ad3733 0000000000000202 00000000000000ff ffffffff80239795
> Jun  4 10:52:57 turing-police kernel: [95478.047928] Call Trace:
> Jun  4 10:52:57 turing-police kernel: [95478.047936]  [<ffffffff805207a2>] schedule_timeout+0x8d/0xb4
> Jun  4 10:52:57 turing-police kernel: [95478.047945]  [<ffffffff805207e2>] schedule_timeout_uninterruptible+0x19/0x1b
> Jun  4 10:52:57 turing-police kernel: [95478.047954]  [<ffffffff802397bb>] msleep+0x14/0x1e
> Jun  4 10:52:57 turing-police kernel: [95478.047963]  [<ffffffff8048aa4e>] netdev_run_todo+0x12f/0x234 
> Jun  4 10:52:57 turing-police kernel: [95478.047972]  [<ffffffff8049166f>] rtnl_unlock+0x35/0x37
> Jun  4 10:52:57 turing-police kernel: [95478.047981]  [<ffffffff804894a9>] unregister_netdev+0x1e/0x23
> Jun  4 10:52:57 turing-police kernel: [95478.047994]  [<ffffffff88a5f2c2>] :ppp_generic:ppp_shutdown_interface+0x67/0xbb
> Jun  4 10:52:57 turing-police kernel: [95478.048018]  [<ffffffff88a5f5b8>] :ppp_generic:ppp_release+0x33/0x65
> Jun  4 10:52:57 turing-police kernel: [95478.048028]  [<ffffffff8028d54a>] __fput+0xac/0x176
> Jun  4 10:52:57 turing-police kernel: [95478.048036]  [<ffffffff8028d628>] fput+0x14/0x16
> Jun  4 10:52:57 turing-police kernel: [95478.048045]  [<ffffffff8028a9c6>] filp_close+0x66/0x71
> Jun  4 10:52:57 turing-police kernel: [95478.048054]  [<ffffffff8028bd54>] sys_close+0x98/0xd7
> Jun  4 10:52:57 turing-police kernel: [95478.048062]  [<ffffffff8020a03c>] tracesys+0xdc/0xe1
> Jun  4 10:52:57 turing-police kernel: [95478.048073]  [<00002b45cd2429a0>]

I don't know what could have caused this, sorry.  If it's still there in next -mm
(which is still 100000 compile fixes away) it'd be good if you could bisect it.
Suspects would be git-net.patch, get-netdev-all.patch and gregkh-driver-*.patch

Thanks.
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Messages in current thread:

2.6.22-rc3-mm1, Andrew Morton, (Wed May 30, 11:58 pm)

Re: 2.6.22-rc3-mm1, Cornelia Huck, (Thu May 31, 5:09 am)

Re: 2.6.22-rc3-mm1, Matthew Wilcox, (Thu May 31, 5:15 am)

Re: 2.6.22-rc3-mm1, Cornelia Huck, (Thu May 31, 5:20 am)

Re: 2.6.22-rc3-mm1, Jeff Garzik, (Thu May 31, 5:35 am)

Re: 2.6.22-rc3-mm1, Cornelia Huck, (Thu May 31, 8:11 am)

Re: 2.6.22-rc3-mm1, Christoph Hellwig, (Thu May 31, 8:13 am)

Re: 2.6.22-rc3-mm1, Michal Piotrowski, (Thu May 31, 8:29 am)

Re: 2.6.22-rc3-mm1, Michal Piotrowski, (Thu May 31, 10:53 am)

Re: 2.6.22-rc3-mm1, Michal Piotrowski, (Thu May 31, 11:08 am)

Re: 2.6.22-rc3-mm1, Andrew Morton, (Thu May 31, 11:31 am)

Re: 2.6.22-rc3-mm1, Christoph Lameter, (Thu May 31, 11:41 am)

Re: 2.6.22-rc3-mm1, Andrew Morton, (Thu May 31, 11:53 am)

Re: 2.6.22-rc3-mm1, Christoph Lameter, (Thu May 31, 11:57 am)

Re: 2.6.22-rc3-mm1, Rafael J. Wysocki, (Thu May 31, 12:58 pm)

Re: 2.6.22-rc3-mm1, Mariusz Kozlowski, (Thu May 31, 1:43 pm)

Re: 2.6.22-rc3-mm1, Andrew Morton, (Thu May 31, 2:19 pm)

[PATCH -mm] Freezer: migration_thread should not be freeza ..., Rafael J. Wysocki, (Thu May 31, 2:30 pm)

Re: 2.6.22-rc3-mm1 - works-for-me and a meta-question..., Valdis.Kletnieks, (Thu May 31, 3:05 pm)

Re: 2.6.22-rc3-mm1, Andrew Morton, (Thu May 31, 3:10 pm)

Re: 2.6.22-rc3-mm1 - works-for-me and a meta-question..., Andrew Morton, (Thu May 31, 3:16 pm)

Re: 2.6.22-rc3-mm1 - page_mkwrite() breakage, Mark Fasheh, (Thu May 31, 4:13 pm)

Re: 2.6.22-rc3-mm1 - page_mkwrite() breakage, Nick Piggin, (Thu May 31, 6:01 pm)

Re: 2.6.22-rc3-mm1 - page_mkwrite() breakage, Mark Fasheh, (Thu May 31, 6:24 pm)

Re: 2.6.22-rc3-mm1 - page_mkwrite() breakage, Nick Piggin, (Thu May 31, 6:34 pm)

Re: 2.6.22-rc3-mm1 - page_mkwrite() breakage, Mark Fasheh, (Thu May 31, 6:45 pm)

Re: 2.6.22-rc3-mm1 - page_mkwrite() breakage, Nick Piggin, (Thu May 31, 6:53 pm)

Re: 2.6.22-rc3-mm1, Arnaldo Carvalho de Melo, (Thu May 31, 7:01 pm)

Re: 2.6.22-rc3-mm1, Andrew Morton, (Thu May 31, 7:12 pm)

Re: 2.6.22-rc3-mm1, Arnaldo Carvalho de Melo, (Thu May 31, 7:24 pm)

Re: 2.6.22-rc3-mm1, Michael Ellerman, (Thu May 31, 8:52 pm)

Re: 2.6.22-rc3-mm1 - page_mkwrite() breakage, Mark Fasheh, (Thu May 31, 10:20 pm)

Re: 2.6.22-rc3-mm1, Eric W. Biederman, (Thu May 31, 10:55 pm)

Re: 2.6.22-rc3-mm1, Cornelia Huck, (Fri Jun 1, 12:09 am)

2.6.22-rc3-mm1: IA64 make allnoconfig broken, Mel Gorman, (Fri Jun 1, 9:42 am)

Re: 2.6.22-rc3-mm1: IA64 make allnoconfig broken, Andrew Morton, (Fri Jun 1, 10:00 am)

Re: 2.6.22-rc3-mm1: IA64 make allnoconfig broken, Mel Gorman, (Fri Jun 1, 11:50 am)

Re: 2.6.22-rc3-mm1, Mariusz Kozlowski, (Fri Jun 1, 1:50 pm)

[PATCH] Fix problem with IA64 make allnoconfig, Mel Gorman, (Fri Jun 1, 1:55 pm)

Re: 2.6.22-rc3-mm1, Andrew Morton, (Fri Jun 1, 2:02 pm)

Re: 2.6.22-rc3-mm1, Mariusz Kozlowski, (Fri Jun 1, 2:21 pm)

Re: 2.6.22-rc3-mm1 - page_mkwrite() breakage, Mark Fasheh, (Fri Jun 1, 3:01 pm)

Re: 2.6.22-rc3-mm1 - page_mkwrite() breakage, Andrew Morton, (Fri Jun 1, 3:25 pm)

Re: 2.6.22-rc3-mm1 - page_mkwrite() breakage, Mark Fasheh, (Fri Jun 1, 3:33 pm)

Re: 2.6.22-rc3-mm1 - page_mkwrite() breakage, Andrew Morton, (Fri Jun 1, 3:47 pm)

Re: 2.6.22-rc3-mm1 - page_mkwrite() breakage, Mark Fasheh, (Fri Jun 1, 3:53 pm)

Re: 2.6.22-rc3-mm1, Benjamin Herrenschmidt, (Fri Jun 1, 4:30 pm)

Re: 2.6.22-rc3-mm1, Segher Boessenkool, (Sat Jun 2, 1:40 am)

2.6.22-rc3-mm1: Xen compile error with X86_CMPXCHG=n, Adrian Bunk, (Sat Jun 2, 6:57 am)

[-mm patch] fix XEN_BLKDEV_FRONTEND Makefile entry, Adrian Bunk, (Sat Jun 2, 10:06 am)

2.6.22-rc3-mm1: __attribute__((weak)) considered harmful, Adrian Bunk, (Sat Jun 2, 10:14 am)

[-mm patch] the ASYNC_* options shouldn't be user visible, Adrian Bunk, (Sat Jun 2, 12:09 pm)

[-mm patch] make drivers/firmware/dmi-id.c:dmi_id_init() s ..., Adrian Bunk, (Sun Jun 3, 1:54 pm)

[-mm patch] drivers/i2c/chips/ds1682.c: make code static, Adrian Bunk, (Sun Jun 3, 1:54 pm)

[-mm patch] make xpad_play_effect() static, Adrian Bunk, (Sun Jun 3, 1:54 pm)

[-mm patch] fix the tea5761 tuner support, Adrian Bunk, (Sun Jun 3, 1:54 pm)

Re: [-mm patch] drivers/i2c/chips/ds1682.c: make code static, Jean Delvare, (Mon Jun 4, 1:15 am)

RE: [-mm patch] the ASYNC_* options shouldn't be user visible, Williams, Dan J, (Mon Jun 4, 9:19 am)

2.6.22-rc3-mm1 - pppd hanging in netdev_run_todo while hol ..., Valdis.Kletnieks, (Mon Jun 4, 11:00 am)

Re: 2.6.22-rc3-mm1: __attribute__((weak)) considered harmful, Andrew Morton, (Mon Jun 4, 2:22 pm)

[-mm patch] e1000: #if 0 two functions, Adrian Bunk, (Mon Jun 4, 3:12 pm)

[-mm patch] drivers/mmc/core/core.{h,c}: cleanups, Adrian Bunk, (Mon Jun 4, 3:13 pm)

Re: 2.6.22-rc3-mm1: __attribute__((weak)) considered harmful, Martin Peschke, (Mon Jun 4, 4:52 pm)

Re: 2.6.22-rc3-mm1: __attribute__((weak)) considered harmful, Russell King, (Mon Jun 4, 8:59 pm)

Re: 2.6.22-rc3-mm1, Ingo Molnar, (Tue Jun 5, 2:11 am)

Re: 2.6.22-rc3-mm1, Ingo Molnar, (Tue Jun 5, 2:18 am)

Re: 2.6.22-rc3-mm1, Andrew Morton, (Tue Jun 5, 2:24 am)

Re: 2.6.22-rc3-mm1, Ingo Molnar, (Tue Jun 5, 2:33 am)

Re: 2.6.22-rc3-mm1, Ingo Molnar, (Tue Jun 5, 2:39 am)

Re: 2.6.22-rc3-mm1, Ingo Molnar, (Tue Jun 5, 2:42 am)

Re: 2.6.22-rc3-mm1, Ingo Molnar, (Tue Jun 5, 2:45 am)

Re: 2.6.22-rc3-mm1, Ingo Molnar, (Tue Jun 5, 2:50 am)

Re: 2.6.22-rc3 nmi watchdog hang, Ingo Molnar, (Tue Jun 5, 2:56 am)

Re: 2.6.22-rc3-mm1, Rusty Russell, (Tue Jun 5, 8:16 am)

[-mm patch] kernel/power/disk.c: make code static, Adrian Bunk, (Tue Jun 5, 2:50 pm)

[-mm patch] kernel/sched{,_fair}.c: make code static, Adrian Bunk, (Tue Jun 5, 2:50 pm)

[-mm patch] kernel/lockdep_proc.c: make 2 functions static, Adrian Bunk, (Tue Jun 5, 2:51 pm)

[-mm patch] fs/proc/base.c: make a struct static, Adrian Bunk, (Tue Jun 5, 2:51 pm)

Re: [-mm patch] kernel/power/disk.c: make code static, Rafael J. Wysocki, (Tue Jun 5, 3:10 pm)

Re: [-mm patch] kernel/lockdep_proc.c: make 2 functions static, Peter Zijlstra, (Tue Jun 5, 3:34 pm)

Re: 2.6.22-rc3-mm1 - pppd hanging in netdev_run_todo while ..., Andrew Morton, (Tue Jun 5, 11:14 pm)

Re: [-mm patch] kernel/sched{,_fair}.c: make code static, Andrew Morton, (Tue Jun 5, 11:54 pm)

Re: [-mm patch] kernel/sched{,_fair}.c: make code static, Ingo Molnar, (Wed Jun 6, 12:02 am)

Re: [-mm patch] kernel/sched{,_fair}.c: make code static, Ingo Molnar, (Wed Jun 6, 12:30 am)

Re: [-mm patch] fs/proc/base.c: make a struct static, Ingo Molnar, (Wed Jun 6, 12:32 am)

Re: [-mm patch] kernel/sched{,_fair}.c: make code static, Adrian Bunk, (Wed Jun 6, 5:31 am)

Re: [-mm patch] drivers/mmc/core/core.{h,c}: cleanups, Pierre Ossman, (Wed Jun 6, 11:36 am)

Re: [-mm patch] make drivers/firmware/dmi-id.c:dmi_id_init ..., Greg KH, (Thu Jun 7, 9:38 pm)

Re: 2.6.22-rc3 nmi watchdog hang, Björn, (Sun Jun 10, 11:10 am)

Re: 2.6.22-rc3 nmi watchdog hang, Ingo Molnar, (Mon Jun 18, 5:11 am)

Re: 2.6.22-rc3 nmi watchdog hang, Björn, (Mon Jun 18, 7:31 am)

Re: 2.6.22-rc3 nmi watchdog hang, Ingo Molnar, (Sun Jun 24, 11:18 pm)

Re: 2.6.22-rc3 nmi watchdog hang, Ingo Molnar, (Sun Jun 24, 11:59 pm)

[patch, 2.6.22-rc6] fix nmi_watchdog=2 bootup hang, Ingo Molnar, (Mon Jun 25, 1:05 am)

Re: [patch, 2.6.22-rc6] fix nmi_watchdog=2 bootup hang, Ingo Molnar, (Mon Jun 25, 1:26 am)

Re: [patch, 2.6.22-rc6] fix nmi_watchdog=2 bootup hang, Jeremy Fitzhardinge, (Mon Jun 25, 5:40 am)

Re: [patch, 2.6.22-rc6] fix nmi_watchdog=2 bootup hang, Björn, (Mon Jun 25, 5:45 am)

Re: [patch, 2.6.22-rc6] fix nmi_watchdog=2 bootup hang, Jeremy Fitzhardinge, (Mon Jun 25, 5:49 am)

Re: [patch, 2.6.22-rc6] fix nmi_watchdog=2 bootup hang, Björn, (Mon Jun 25, 6:06 am)

Re: [patch, 2.6.22-rc6] fix nmi_watchdog=2 bootup hang, Björn, (Mon Jun 25, 6:13 am)

[patch, 2.6.22-rc6] fix nmi_watchdog=2 bootup hang, take #2, Ingo Molnar, (Mon Jun 25, 11:50 am)

Re: 2.6.22-rc3-mm1: Xen compile error with X86_CMPXCHG=n, Adrian Bunk, (Thu Jun 28, 4:36 pm)

Re: 2.6.22-rc3-mm1: Xen compile error with X86_CMPXCHG=n, Jeremy Fitzhardinge, (Thu Jun 28, 8:21 pm)


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