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Date: Tue, 7 Apr 2009 11:17:00 +0200 (CEST) From: Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com> To: Andrea Righi <righi.andrea@...il.com> cc: Krzysztof Helt <krzysztof.h1@...zta.fm>, Andrew Morton <akpm@...ux-foundation.org>, "Rafael J. Wysocki" <rjw@...k.pl>, Andrey Borzenkov <arvidjaar@...il.com>, "Antonino A. Daplas" <adaplas@...il.com>, Linux Frame Buffer Device Development <linux-fbdev-devel@...ts.sourceforge.net>, linux-pm@...ts.linux-foundation.org, Linux Kernel Development <linux-kernel@...r.kernel.org>, Dave Jones <davej@...hat.com>, Harvey Harrison <harvey.harrison@...il.com>, Johannes Weiner <hannes@...xchg.org>, Stefan Richter <stefanr@...6.in-berlin.de> Subject: Re: commit 66c1ca breaks fbdev mode switching On Mon, 6 Apr 2009, Andrea Righi wrote: > On Mon, Apr 06, 2009 at 08:47:18PM +0200, Krzysztof Helt wrote: > > The commit 66c1ca breaks fbdev mode switching. The first mode > > (selected with mode_option or during boot) is ok but every mode > > switch with fbset locks up computer. If the commit is reverted > > mode switching works correctly. > > > > I do not understand why. I would be grateful if someone else > > can confirm the problem as well. > > > > The commit's details are: > > > > commit 66c1ca019078220dc1bf968f2bb18421100ef147 > > Author: Andrea Righi <righi.andrea@...il.com> > > Date: Tue Mar 31 15:25:18 2009 -0700 > > > > fbmem: fix fb_info->lock and mm->mmap_sem circular locking dependency > > Any lockdep info or oops? it just locks up the system? # echo d > /proc/sysrq-trigger [ 187.654947] INFO: lockdep is turned off. Strange, I do have lockdep enabled: CONFIG_LOCKDEP_SUPPORT=y CONFIG_LOCKDEP=y CONFIG_DEBUG_LOCKDEP=y # echo w > /proc/sysrq-trigger [ 243.301997] SysRq : Show Blocked State [ 243.302007] task PC stack pid father [ 243.302017] events/0 D 0000000000000000 0 9 2 [ 243.302025] Call Trace: [ 243.302038] [c0000000060cb680] [c0000000060cb730] 0xc0000000060cb730 (unreliable) [ 243.302055] [c0000000060cb850] [c00000000001088c] .__switch_to+0xec/0x14c [ 243.302068] [c0000000060cb8e0] [c0000000003c449c] .__schedule+0x9b8/0xa9c [ 243.302078] [c0000000060cba10] [c0000000003c459c] .schedule+0x1c/0x3c [ 243.302087] [c0000000060cba90] [c0000000003c4798] .schedule_timeout+0x40/0x1f8 [ 243.302098] [c0000000060cbb80] [c0000000003c65b4] .__down+0x70/0xc4 [ 243.302110] [c0000000060cbc40] [c000000000073f3c] .down+0x44/0x6c [ 243.302123] [c0000000060cbcd0] [c0000000000532c0] .acquire_console_sem+0x30/0x64 [ 243.302143] [c0000000060cbd50] [c00000000024511c] .console_callback+0x20/0x19c [ 243.302156] [c0000000060cbdf0] [c00000000006940c] .worker_thread+0x23c/0x364 [ 243.302165] [c0000000060cbf00] [c00000000006e5d4] .kthread+0x78/0xc4 [ 243.302177] [c0000000060cbf90] [c000000000021450] .kernel_thread+0x54/0x70 [ 243.302184] events/1 D 0000000000000000 0 10 2 [ 243.302192] Call Trace: [ 243.302199] [c0000000060d3660] [c0000000060d3710] 0xc0000000060d3710 (unreliable) [ 243.302210] [c0000000060d3830] [c00000000001088c] .__switch_to+0xec/0x14c [ 243.302220] [c0000000060d38c0] [c0000000003c449c] .__schedule+0x9b8/0xa9c [ 243.302229] [c0000000060d39f0] [c0000000003c459c] .schedule+0x1c/0x3c [ 243.302238] [c0000000060d3a70] [c0000000003c4798] .schedule_timeout+0x40/0x1f8 [ 243.302248] [c0000000060d3b60] [c0000000003c65b4] .__down+0x70/0xc4 [ 243.302257] [c0000000060d3c20] [c000000000073f3c] .down+0x44/0x6c [ 243.302267] [c0000000060d3cb0] [c0000000000532c0] .acquire_console_sem+0x30/0x64 [ 243.302278] [c0000000060d3d30] [c00000000021ac88] .fb_flashcursor+0x44/0x3bc [ 243.302288] [c0000000060d3df0] [c00000000006940c] .worker_thread+0x23c/0x364 [ 243.302298] [c0000000060d3f00] [c00000000006e5d4] .kthread+0x78/0xc4 [ 243.302307] [c0000000060d3f90] [c000000000021450] .kernel_thread+0x54/0x70 [ 243.302322] ps3fb D 0000000000000000 0 370 2 [ 243.302330] Call Trace: [ 243.302337] [c0000000061077a0] [c000000006107850] 0xc000000006107850 (unreliable) [ 243.302348] [c000000006107970] [c00000000001088c] .__switch_to+0xec/0x14c [ 243.302358] [c000000006107a00] [c0000000003c449c] .__schedule+0x9b8/0xa9c [ 243.302367] [c000000006107b30] [c0000000003c459c] .schedule+0x1c/0x3c [ 243.302376] [c000000006107bb0] [c0000000003c4798] .schedule_timeout+0x40/0x1f8 [ 243.302386] [c000000006107ca0] [c0000000003c65b4] .__down+0x70/0xc4 [ 243.302396] [c000000006107d60] [c000000000073f3c] .down+0x44/0x6c [ 243.302406] [c000000006107df0] [c0000000000532c0] .acquire_console_sem+0x30/0x64 [ 243.302417] [c000000006107e70] [c000000000228d0c] .ps3fbd+0x4c/0x9c [ 243.302426] [c000000006107f00] [c00000000006e5d4] .kthread+0x78/0xc4 [ 243.302435] [c000000006107f90] [c000000000021450] .kernel_thread+0x54/0x70 [ 243.302466] fbset D 000000000ff59878 0 2069 2065 [ 243.302474] Call Trace: [ 243.302481] [c000000006d43040] [c000000006d430f0] 0xc000000006d430f0 (unreliable) [ 243.302492] [c000000006d43210] [c00000000001088c] .__switch_to+0xec/0x14c [ 243.302502] [c000000006d432a0] [c0000000003c449c] .__schedule+0x9b8/0xa9c [ 243.302512] [c000000006d433d0] [c0000000003c587c] .mutex_lock_nested+0x268/0x414 [ 243.302521] [c000000006d434d0] [c000000000214200] .lock_fb_info+0x28/0x64 [ 243.302531] [c000000006d43560] [c0000000002208f8] .fbcon_event_notify+0x144/0x89c [ 243.302542] [c000000006d436b0] [c000000000074174] .notifier_call_chain+0xac/0x124 [ 243.302552] [c000000006d43760] [c000000000074510] .__blocking_notifier_call_chain+0x70/0xb0 [ 243.302565] [c000000006d43810] [c000000000213bd0] .fb_notifier_call_chain+0x28/0x40 [ 243.302575] [c000000006d43890] [c000000000215dec] .fb_set_var+0x2d4/0x314 [ 243.302583] [c000000006d43a10] [c000000000215f68] .do_fb_ioctl+0x13c/0x4bc [ 243.302592] [c000000006d43c10] [c0000000002163dc] .fb_compat_ioctl+0xf4/0x834 [ 243.302606] [c000000006d43d50] [c0000000001292c4] .compat_sys_ioctl+0x11c/0x448 [ 243.302616] [c000000006d43e30] [c0000000000074dc] syscall_exit+0x0/0x40 and a bit later: [ 608.812517] INFO: task events/0:9 blocked for more than 480 seconds. [ 608.812523] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 608.812529] events/0 D 0000000000000000 0 9 2 [ 608.812538] Call Trace: [ 608.812550] [c0000000060cb680] [c0000000060cb730] 0xc0000000060cb730 (unreliable) [ 608.812567] [c0000000060cb850] [c00000000001088c] .__switch_to+0xec/0x14c [ 608.812580] [c0000000060cb8e0] [c0000000003c449c] .__schedule+0x9b8/0xa9c [ 608.812590] [c0000000060cba10] [c0000000003c459c] .schedule+0x1c/0x3c [ 608.812599] [c0000000060cba90] [c0000000003c4798] .schedule_timeout+0x40/0x1f8 [ 608.812610] [c0000000060cbb80] [c0000000003c65b4] .__down+0x70/0xc4 [ 608.812622] [c0000000060cbc40] [c000000000073f3c] .down+0x44/0x6c [ 608.812635] [c0000000060cbcd0] [c0000000000532c0] .acquire_console_sem+0x30/0x64 [ 608.812647] [c0000000060cbd50] [c00000000024511c] .console_callback+0x20/0x19c [ 608.812659] [c0000000060cbdf0] [c00000000006940c] .worker_thread+0x23c/0x364 [ 608.812669] [c0000000060cbf00] [c00000000006e5d4] .kthread+0x78/0xc4 [ 608.812681] [c0000000060cbf90] [c000000000021450] .kernel_thread+0x54/0x70 [ 608.812687] INFO: lockdep is turned off. [ 608.812693] INFO: task events/1:10 blocked for more than 480 seconds. [ 608.812698] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 608.812703] events/1 D 0000000000000000 0 10 2 [ 608.812711] Call Trace: [ 608.812718] [c0000000060d3660] [c0000000060d3710] 0xc0000000060d3710 (unreliable) [ 608.812729] [c0000000060d3830] [c00000000001088c] .__switch_to+0xec/0x14c [ 608.812738] [c0000000060d38c0] [c0000000003c449c] .__schedule+0x9b8/0xa9c [ 608.812748] [c0000000060d39f0] [c0000000003c459c] .schedule+0x1c/0x3c [ 608.812757] [c0000000060d3a70] [c0000000003c4798] .schedule_timeout+0x40/0x1f8 [ 608.812767] [c0000000060d3b60] [c0000000003c65b4] .__down+0x70/0xc4 [ 608.812776] [c0000000060d3c20] [c000000000073f3c] .down+0x44/0x6c [ 608.812786] [c0000000060d3cb0] [c0000000000532c0] .acquire_console_sem+0x30/0x64 [ 608.812797] [c0000000060d3d30] [c00000000021ac88] .fb_flashcursor+0x44/0x3bc [ 608.812807] [c0000000060d3df0] [c00000000006940c] .worker_thread+0x23c/0x364 [ 608.812816] [c0000000060d3f00] [c00000000006e5d4] .kthread+0x78/0xc4 [ 608.812826] [c0000000060d3f90] [c000000000021450] .kernel_thread+0x54/0x70 [ 608.812832] INFO: lockdep is turned off. [ 608.812868] INFO: task fbset:2069 blocked for more than 480 seconds. [ 608.812872] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 608.812878] fbset D 000000000ff59878 0 2069 2065 [ 608.812886] Call Trace: [ 608.812893] [c000000006d43040] [c000000006d430f0] 0xc000000006d430f0 (unreliable) [ 608.812904] [c000000006d43210] [c00000000001088c] .__switch_to+0xec/0x14c [ 608.812914] [c000000006d432a0] [c0000000003c449c] .__schedule+0x9b8/0xa9c [ 608.812924] [c000000006d433d0] [c0000000003c587c] .mutex_lock_nested+0x268/0x414 [ 608.812933] [c000000006d434d0] [c000000000214200] .lock_fb_info+0x28/0x64 [ 608.812943] [c000000006d43560] [c0000000002208f8] .fbcon_event_notify+0x144/0x89c [ 608.812954] [c000000006d436b0] [c000000000074174] .notifier_call_chain+0xac/0x124 [ 608.812964] [c000000006d43760] [c000000000074510] .__blocking_notifier_call_chain+0x70/0xb0 [ 608.812978] [c000000006d43810] [c000000000213bd0] .fb_notifier_call_chain+0x28/0x40 [ 608.812987] [c000000006d43890] [c000000000215dec] .fb_set_var+0x2d4/0x314 [ 608.812996] [c000000006d43a10] [c000000000215f68] .do_fb_ioctl+0x13c/0x4bc [ 608.813005] [c000000006d43c10] [c0000000002163dc] .fb_compat_ioctl+0xf4/0x834 [ 608.813018] [c000000006d43d50] [c0000000001292c4] .compat_sys_ioctl+0x11c/0x448 [ 608.813028] [c000000006d43e30] [c0000000000074dc] syscall_exit+0x0/0x40 [ 608.813034] INFO: lockdep is turned off. As evidenced by the compat_sys_ioctl, this is a 32-bit userland on ppc64. With kind regards, Geert Uytterhoeven Software Architect Sony Techsoft Centre Europe The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium Phone: +32 (0)2 700 8453 Fax: +32 (0)2 700 8622 E-mail: Geert.Uytterhoeven@...ycom.com Internet: http://www.sony-europe.com/ A division of Sony Europe (Belgium) N.V. VAT BE 0413.825.160 · RPR Brussels Fortis · BIC GEBABEBB · IBAN BE41293037680010 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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