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Date: Thu, 27 Aug 2009 15:54:03 +0200 (CEST) From: Pawel Golaszewski <blues@....pl> To: Peter Zijlstra <peterz@...radead.org> cc: linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>, Dhaval Giani <dhaval.giani@...il.com> Subject: Re: PROBLEM: oops On Thu, 27 Aug 2009, Peter Zijlstra wrote: > > > > > > > > could you try to reproduce without that? > > > > > > > > > > > > > > > > CONFIG_GROUP_SCHED=n > > > > > > > I'll try. > > > > > It seems that problem still exists - system has crashed too. From > > > > > netconsole: Any ideas? Last kernel I was using is 2.6.27.13 - works > > > > > fine. None between 13 and 31 tested... > > > > # git log --format=oneline v2.6.27.13..v2.6.27.31 kernel/sched* > > > > 2b46f3769896dc04e1e49144d282e4655677105a wait: prevent exclusive waiter starvation > > > > > > > > Nothing changed anywhere near the code that is falling apart.. > > > I have 2 machines with the same hardware and similar software. On > > > one .13 is stable - I will test it on the second one. Should be too. > > I've checked it - 2.6.27.13 is stable for me. > > > > Conclusion: there is something wrong between 2.6.27.13 and 2.6.27.31 > > What can I do about that? I'm not kernel-hacker... > Unless any of the memory debugging options yield a clue the best you can > do is a bisection I'm afraid. > > # git log --format=oneline v2.6.27.13..v2.6.27.31 | wc -l > 630 Checked 2.6.27.25 - crashed. Problem is somewhere between 2.6.27.13 and 2.6.27.25. I will check one or two more kernels - sorry, I can't play more on that machine... >From console - will it help?: [ 4243.524886] BUG: unable to handle kernel <1>BUG: unable to handle kernel paging request at ffffffd8 [ 4243.524935] IP: [<c081cc50>] hrtick_start_fair+0x0/0x30 [ 4243.524991] *pde = 00008067 *pte = 00000000 [ 4243.525006] Oops: 0000 [#1] SMP [ 4243.525017] Modules linked in: softdog netconsole configfs sch_sfq xfs raid10 ppdev uhci_hcd eepro100 parport_pc ehci_hcd parport piix psmouse e100 i2c_piix4 serio_raw evdev thermal usbcore e1000 mii ide_core container i2c_core sg pcspkr processor button ext3 jbd mbcache scsi_wait_scan sd_mod crc_t10dif ata_piix libata dock aic7xxx sym53c8xx scsi_transport_spi scsi_mod raid1 md_mod [ 4243.525087] [ 4243.525097] Pid: 1783, comm: xfsbufd Not tainted (2.6.27.25-1 #1) [ 4243.525105] EIP: 0060:[<c081cc50>] EFLAGS: 00010046 CPU: 0 [ 4243.525118] EIP is at hrtick_start_fair+0x0/0x30 [ 4243.525125] EAX: c1d8be00 EBX: c1d8be00 ECX: 00000001 EDX: ffffffd4 [ 4243.525133] ESI: 00000000 EDI: ffffffd4 EBP: c1d8be00 ESP: f72afec4 [ 4243.525140] DS: 0068 ES: 007b FS: 00d8 GS: 0000 SS: 0068 [ 4243.525148] Process xfsbufd (pid: 1783, ti=f72ae000 task=f78af980 task.ti=f72ae000) [ 4243.525157] Stack: c081cd5b 00000000 c1d8be00 c1d8be00 c0ac9f00 f78af980 00000000 c1d8be00 [ 4243.525171] c0a9b593 00000000 00000082 f88b5044 00000004 f72aff14 f78af980 c1d8be00 [ 4243.525184] c1d8c288 000003db 00000000 00000000 f72514f0 00200286 00003e00 f78afb08 [ 4243.525198] Call Trace: [ 4243.525205] [<c081cd5b>] pick_next_task_fair+0xdb/0x100 [ 4243.525220] [<c0a9b593>] schedule+0x5b3/0xc00 [ 4243.525255] [<f88b5044>] ahc_print_path+0xba4/0x1090 [aic7xxx] [ 4243.525313] [<c0830837>] lock_timer_base+0x27/0x50 [ 4243.525332] [<c08309c9>] __mod_timer+0xa9/0xf0 [ 4243.525341] [<c08308a1>] try_to_del_timer_sync+0x41/0x50 [ 4243.525351] [<c0a9bf2d>] schedule_timeout+0x8d/0xf0 [ 4243.525363] [<c0830440>] process_timeout+0x0/0x10 [ 4243.525372] [<c0a9bf28>] schedule_timeout+0x88/0xf0 [ 4243.525382] [<f8b0f3df>] xfs_free_buftarg+0x9f/0x160 [xfs] [ 4243.525523] [<f8b0f380>] xfs_free_buftarg+0x40/0x160 [xfs] [ 4243.525554] [<c083ade9>] kthread+0x39/0x70 [ 4243.525575] [<c083adb0>] kthread+0x0/0x70 [ 4243.525583] [<c0805007>] kernel_thread_helper+0x7/0x10 [ 4243.525603] ======================= [ 4243.525607] Code: 5e 5f 5d c3 8d b4 26 00 00 00 00 8d 73 3c 89 f0 e8 56 ef ff ff 8b 7f 48 85 ff 74 dc 89 ea 89 f0 e8 a6 fe ff ff eb d1 8d 74 26 00 <8b> 52 04 b9 00 3e 00 00 8b 52 10 8b 14 95 c0 f6 c0 c0 8d 94 11 [ 4243.525670] EIP: [<c081cc50>] hrtick_start_fair+0x0/0x30 SS:ESP 0068:f72afec4 [ 4243.526080] Kernel panic - not syncing: Fatal exception [ 4243.526120] ------------[ cut here ]------------ [ 4243.526127] WARNING: at kernel/smp.c:332 smp_call_function_mask+0x16d/0x1c0() [ 4243.526133] Modules linked in: softdog netconsole configfs sch_sfq xfs raid10 ppdev uhci_hcd eepro100 parport_pc ehci_hcd parport piix psmouse e100 i2c_piix4 serio_raw evdev thermal usbcore e1000 mii ide_core container i2c_core sg pcspkr processor button ext3 jbd mbcache scsi_wait_scan sd_mod crc_t10dif ata_piix libata dock aic7xxx sym53c8xx scsi_transport_spi scsi_mod raid1 md_mod [ 4243.526192] Pid: 1783, comm: xfsbufd Tainted: G D 2.6.27.25-1 #1 [ 4243.526199] [<c082629f>] warn_on_slowpath+0x5f/0xa0 [ 4243.526223] [<c0a9ae54>] printk+0x17/0x1b [ 4243.526233] [<c08408df>] sched_clock_cpu+0x11f/0x180 [ 4243.526252] [<c083f925>] down_trylock+0x25/0x40 [ 4243.526261] [<c083f925>] down_trylock+0x25/0x40 [ 4243.526269] [<c08268fa>] try_acquire_console_sem+0xa/0x30 [ 4243.526281] [<c085434d>] smp_call_function_mask+0x16d/0x1c0 [ 4243.526291] [<c085f85c>] crash_kexec+0x6c/0xd0 [ 4243.526316] [<c0850020>] tick_nohz_stop_sched_tick+0x300/0x390 [ 4243.526326] [<c0830837>] lock_timer_base+0x27/0x50 [ 4243.526335] [<c0967eee>] vga_set_palette+0xbe/0x110 [ 4243.526362] [<c0967eee>] vga_set_palette+0xbe/0x110 [ 4243.526372] [<c08543b4>] smp_call_function+0x14/0x20 [ 4243.526381] [<c081249e>] native_smp_send_stop+0x1e/0x30 [ 4243.526406] [<c0a9adab>] panic+0x51/0xe3 [ 4243.526415] [<c0a9df34>] oops_end+0xa4/0xb0 [ 4243.526429] [<c0a9fc08>] do_page_fault+0x368/0x730 [ 4243.526443] [<c089bbc4>] slab_pad_check+0x44/0x140 [ 4243.526474] [<c089c0df>] check_object+0xdf/0x210 [ 4243.526485] [<c087a220>] mempool_alloc+0x40/0x100 [ 4243.526508] [<c089dbfa>] __slab_alloc+0x4aa/0x590 [ 4243.526520] [<c089c0df>] check_object+0xdf/0x210 [ 4243.526529] [<c087a220>] mempool_alloc+0x40/0x100 [ 4243.526538] [<c087a220>] mempool_alloc+0x40/0x100 [ 4243.526547] [<c087a220>] mempool_alloc+0x40/0x100 [ 4243.526557] [<f8858020>] scsi_free_command+0x80/0xb0 [scsi_mod] [ 4243.526615] [<c0951cbf>] __sg_alloc_table+0x5f/0xf0 [ 4243.526632] [<c0a9f8a0>] do_page_fault+0x0/0x730 [ 4243.526641] [<c0a9dbc5>] error_code+0x75/0x80 [ 4243.526650] [<c081cc50>] hrtick_start_fair+0x0/0x30 [ 4243.526660] [<c081cd5b>] pick_next_task_fair+0xdb/0x100 [ 4243.526670] [<c0a9b593>] schedule+0x5b3/0xc00 [ 4243.526681] [<f88b5044>] ahc_print_path+0xba4/0x1090 [aic7xxx] [ 4243.526701] [<c0830837>] lock_timer_base+0x27/0x50 [ 4243.526710] [<c08309c9>] __mod_timer+0xa9/0xf0 [ 4243.526718] [<c08308a1>] try_to_del_timer_sync+0x41/0x50 [ 4243.526727] [<c0a9bf2d>] schedule_timeout+0x8d/0xf0 [ 4243.526737] [<c0830440>] process_timeout+0x0/0x10 [ 4243.526745] [<c0a9bf28>] schedule_timeout+0x88/0xf0 [ 4243.526755] [<f8b0f3df>] xfs_free_buftarg+0x9f/0x160 [xfs] [ 4243.526786] [<f8b0f380>] xfs_free_buftarg+0x40/0x160 [xfs] [ 4243.526816] [<c083ade9>] kthread+0x39/0x70 [ 4243.526825] [<c083adb0>] kthread+0x0/0x70 [ 4243.526833] [<c0805007>] kernel_thread_helper+0x7/0x10 [ 4243.526842] ======================= [ 4243.526847] ---[ end trace bce437568718debf ]--- [ 4243.526871] Rebooting in 10 seconds..NULL pointer dereference at 00000000 [ 4243.527499] IP: [<c094c633>] rb_insert_color+0x53/0x100 [ 4243.527499] *pde = 00000000 [ 4243.527499] Oops: 0002 [#2] SMP [ 4243.527499] Modules linked in: softdog netconsole configfs sch_sfq xfs raid10 ppdev uhci_hcd eepro100 parport_pc ehci_hcd parport piix psmouse e100 i2c_piix4 serio_raw evdev thermal usbcore e1000 mii ide_core container i2c_core sg pcspkr processor button ext3 jbd mbcache scsi_wait_scan sd_mod crc_t10dif ata_piix libata dock aic7xxx sym53c8xx scsi_transport_spi scsi_mod raid1 md_mod [ 4243.527499] [ 4243.527499] Pid: 207, comm: kswapd0 Tainted: G D W (2.6.27.25-1 #1) [ 4243.527499] EIP: 0060:[<c094c633>] EFLAGS: 00010002 CPU: 3 [ 4243.527499] EIP is at rb_insert_color+0x53/0x100 [ 4243.527499] EAX: 00000000 EBX: c1d8be00 ECX: f78af9b4 EDX: c1d8be60 [ 4243.527499] ESI: f71c9b00 EDI: f78af9b4 EBP: f71c9b34 ESP: f7a47e6c [ 4243.527499] DS: 0068 ES: 007b FS: 00d8 GS: 0000 SS: 0068 [ 4243.527499] Process kswapd0 (pid: 207, ti=f7a46000 task=f7922400 task.ti=f7a46000) [ 4243.527499] Stack: c1d8be3c c1d8be60 c1d8be00 f71c9b00 c1d8be3c f71c9b2c c081da54 00000000 [ 4243.527499] c1da0e00 c0ac9f00 f71c9b00 05ca51ee 000003dc c081ba46 c1da0e00 f71cb214 [ 4243.527499] f71c9b00 0000012c c0a9b560 f7a47f14 00000086 00000079 c1d8be00 00000001 [ 4243.527499] Call Trace: [ 4243.527499] [<c081da54>] enqueue_task_fair+0x94/0xe0 [ 4243.527499] [<c081ba46>] enqueue_task+0x26/0x80 [ 4243.527499] [<c0a9b560>] schedule+0x580/0xc00 [ 4243.527499] [<c0882c2f>] kswapd+0x4df/0x520 [ 4243.527499] [<c0881270>] isolate_pages_global+0x0/0x60 [ 4243.527499] [<c083b090>] autoremove_wake_function+0x0/0x40 [ 4243.527499] [<c0882750>] kswapd+0x0/0x520 [ 4243.527499] [<c083ade9>] kthread+0x39/0x70 [ 4243.527499] [<c083adb0>] kthread+0x0/0x70 [ 4243.527499] [<c0805007>] kernel_thread_helper+0x7/0x10 [ 4243.527499] ======================= [ 4243.527499] Code: 74 5e 85 db 74 32 8b 13 f6 c2 01 75 2b 83 ca 01 89 13 89 f3 83 0f 01 89 dd 8b 3e 83 e7 fe 89 3e 83 e7 fc 75 cb 8b 54 24 04 8b 02 <83> 08 01 83 c4 08 5b 5e 5f 5d c3 -- pozdr. Paweł Gołaszewski jid:blues<at>jabber<dot>gda<dot>pl -------------------------------------------------------------------------- If you think of MS-DOS as mono, and Windows as stereo, then Linux is Dolby Pro-Logic Surround Sound with Bass Boost and all the music is free.
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