Re: 2.6.15-rc1-mm2

Re: 2.6.15-rc1-mm2

[Stas Sergeev]

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Hi.

Andrew Morton wrote:
> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.15-rc1/2.6.15-rc1-mm2/
Everything works fine on plain 2.6.14.
Since 2.6.14-mm1 I am getting the attached Oops
(grabbed via netconsole, from 2.6.15-rc1-mm2).
After that Oops, the PC is completely dead.
The Oops happens when the saa7134 module is being
modprobed. Any ideas?
(sorry for the duplicate report, in the previous one
I confused the kernel versions)


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ACPI: PCI Interrupt Link [APC2] enabled at IRQ 17
Unable to handle kernel NULL pointer dereference at 00000000000007d0 RIP: 
<ffffffff802b11e0>{input_register_device+16}
PGD 19c6e067 PUD 19c59067 PMD 0 
Oops: 0000 [1] PREEMPT SMP 
CPU 0 
Modules linked in: saa7134 video_buf v4l2_common v4l1_compat ir_kbd_i2c ir_common videodev netconsole ipv6 lp autofs4 ipt_state ip_conntrack iptable_filter ip_tables nls_cp866 vfat fat usbhid video thermal processor fan button battery ac ohci_hcd ehci_hcd i2c_nforce2 shpchp snd_intel8x0 snd_ac97_codec snd_ac97_bus snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd soundcore snd_page_alloc 8139too mii forcedeth floppy sata_nv libata
Pid: 2470, comm: modprobe Not tainted 2.6.15-rc1-mm2 #14
RIP: 0010:[<ffffffff802b11e0>] <ffffffff802b11e0>{input_register_device+16}
RSP: 0018:ffff810019c4bcc8  EFLAGS: 00010292
RAX: 0000000000000000 RBX: ffff81001b783270 RCX: 00000000000000a0
RDX: 0000000000000000 RSI: 0000000000000246 RDI: 0000000000000000
RBP: ffff810019c4bcf8 R08: 00000000000000f9 R09: 00000000ffffffff
R10: 00000000ffffffff R11: 0000000000000246 R12: ffff81001b78321c
R13: 0000000000000000 R14: ffff81001b783000 R15: ffff810019d51800
FS:  00002aaaaadfc6e0(0000) GS:ffffffff80508000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 00000000000007d0 CR3: 0000000019cd9000 CR4: 00000000000006e0
Process modprobe (pid: 2470, threadinfo ffff810019c4a000, task ffff810001bb8450)
Stack: 0000000000000000 0000000000000246 ffff81001b783270 ffff81001b783270 
       ffff81001b78321c ffff810019b8e000 ffff810019c4bd48 ffffffff881bb2ca 
       00000000000007c8 0000000000000010 
Call Trace:<ffffffff881bb2ca>{:saa7134:saa7134_input_init1+890}
       <ffffffff881b2f3b>{:saa7134:saa7134_initdev+1403} <ffffffff802288cd>{pci_device_probe+93}
       <ffffffff802c585f>{driver_probe_device+79} <ffffffff802c59ca>{__driver_attach+90}
       <ffffffff802c5970>{__driver_attach+0} <ffffffff802c4b8f>{bus_for_each_dev+79}
       <ffffffff802c560c>{driver_attach+28} <ffffffff802c50e8>{bus_add_driver+136}
       <ffffffff802c5d65>{driver_register+117} <ffffffff8014c630>{kthread_stop_sem+256}
       <ffffffff8022850e>{__pci_register_driver+206} <ffffffff881b1e06>{:saa7134:saa7134_init+70}
       <ffffffff80154d18>{sys_init_module+312} <ffffffff8010df30>{tracesys+209}
       
Unable to handle kernel NULL pointer dereference at 0000000000000008 RIP: 
<ffffffff8010f71b>{show_trace+619}
PGD 19c6e067 PUD 19c59067 PMD 0 
Oops: 0000 [2] PREEMPT SMP 
CPU 0 
Modules linked in: saa7134 video_buf v4l2_common v4l1_compat ir_kbd_i2c ir_common videodev netconsole ipv6 lp autofs4 ipt_state ip_conntrack iptable_filter ip_tables nls_cp866 vfat fat usbhid video thermal processor fan button battery ac ohci_hcd ehci_hcd i2c_nforce2 shpchp snd_intel8x0 snd_ac97_codec snd_ac97_bus snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd soundcore snd_page_alloc 8139too mii forcedeth floppy sata_nv libata
Pid: 2470, comm: modprobe Not tainted 2.6.15-rc1-mm2 #14
RIP: 0010:[<ffffffff8010f71b>] <ffffffff8010f71b>{show_trace+619}
RSP: 0018:ffff810019c4b9f8  EFLAGS: 00010092
RAX: 0000000000000001 RBX: 000000000000002b RCX: ffff810019cbd640
RDX: 0000000000000000 RSI: 0000000000000046 RDI: 0000000000000001
RBP: ffff810019c4ba38 R08: 0000000000000000 R09: ffff810019b38dc0
R10: 000000000000001f R11: 00000000000003d4 R12: ffff810019c4c000
R13: 0000000000000000 R14: ffffffff804ab0c0 R15: ffffffff80549100
FS:  00002aaaaadfc6e0(0000) GS:ffffffff80508000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000008 CR3: 0000000019cd9000 CR4: 00000000000006e0
Process modprobe (pid: 2470, threadinfo ffff810019c4a000, task ffff810001bb8450)
Stack: 0000000000000000 0000000000000000 0000000000000000 ffff810019c4bd18 
       000000000000000a ffffffff804ab0c0 ffffffff804a70c0 0000000000000000 
       ffff810019c4ba78 ffffffff8010f82a 
Call Trace:<ffffffff8010f82a>{show_stack+234} <ffffffff8010f8cb>{show_registers+139}
       <ffffffff8010fd88>{__die+168} <ffffffff8037f03a>{do_page_fault+1882}
       <ffffffff8037ce90>{preempt_schedule+96} <ffffffff8010ed6d>{error_exit+0}
       <ffffffff802b11e0>{input_register_device+16} <ffffffff8014075b>{__mod_timer+187}
       <ffffffff881bb2ca>{:saa7134:saa7134_input_init1+890}
       <ffffffff881b2f3b>{:saa7134:saa7134_initdev+1403} <ffffffff802288cd>{pci_device_probe+93}
       <ffffffff802c585f>{driver_probe_device+79} <ffffffff802c59ca>{__driver_attach+90}
       <ffffffff802c5970>{__driver_attach+0} <ffffffff802c4b8f>{bus_for_each_dev+79}
       <ffffffff802c560c>{driver_attach+28} <ffffffff802c50e8>{bus_add_driver+136}
       <ffffffff802c5d65>{driver_register+117} <ffffffff8014c630>{kthread_stop_sem+256}
       <ffffffff8022850e>{__pci_register_driver+206} <ffffffff881b1e06>{:saa7134:saa7134_init+70}
       <ffffffff80154d18>{sys_init_module+312} <ffffffff8010df30>{tracesys+209}
       
Unable to handle kernel NULL pointer dereference at 0000000000000008 RIP: 
<ffffffff8010f71b>{show_trace+619}
PGD 19c6e067 PUD 19c59067 PMD 0 
Oops: 0000 [3] PREEMPT SMP 
CPU 0 
Modules linked in: saa7134 video_buf v4l2_common v4l1_compat ir_kbd_i2c ir_common videodev netconsole ipv6 lp autofs4 ipt_state ip_conntrack iptable_filter ip_tables nls_cp866 vfat fat usbhid video thermal processor fan button battery ac ohci_hcd ehci_hcd i2c_nforce2 shpchp snd_intel8x0 snd_ac97_codec snd_ac97_bus snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd soundcore snd_page_alloc 8139too mii forcedeth floppy sata_nv libata
Pid: 2470, comm: modprobe Not tainted 2.6.15-rc1-mm2 #14
RIP: 0010:[<ffffffff8010f71b>] <ffffffff8010f71b>{show_trace+619}
RSP: 0018:ffff810019c4b728  EFLAGS: 00010092
RAX: 0000000000000001 RBX: 000000000000002b RCX: ffff810019cbd640
RDX: 0000000000000000 RSI: 0000000000000046 RDI: 0000000000000001
RBP: ffff810019c4b768 R08: 0000000000000000 R09: ffff810019b38dc0
R10: 000000000000001f R11: 00000000000003d4 R12: ffff810019c4c000
R13: 0000000000000000 R14: ffffffff804ab0c0 R15: ffffffff80549100

       <ffffffff8010fd88>{__die+168} <ffffffff8037f03a>{do_page_fault+1882}
       <ffffffff80135cd8>{release_console_sem+424} <ffffffff801369ae>{vprintk+894}
       <ffffffff881b1e06>{:saa7134:saa7134_init+70} <ffffffff881b1e06>{:saa7134:saa7134_init+70}
       <ffffffff8010ed6d>{error_exit+0} <ffffffff8010f71b>{show_trace+619}

       <ffffffff802c560c>{driver_attach+28} <ffffffff802c50e8>{bus_add_driver+136}
       <ffffffff802c5d65>{driver_register+117} <ffffffff8014c630>{kthread_stop_sem+256}
       <ffffffff8022850e>{__pci_register_driver+206} <ffffffff881b1e06>{:saa7134:saa7134_init+70}
       <ffffffff80154d18>{sys_init_module+312} <ffffffff8010df30>{tracesys+209}
       
Unable to handle kernel NULL pointer dereference at 0000000000000008 RIP: 
Stack: <ffffffff8010f717>{show_trace+615}<ffffffff801369ae>{vprintk+894}<ffffffff881b1e06>{:saa7134:saa7134_init+70}<ffffffff801369ae>{vprintk+894}<ffffffff881bb2ca>{:saa7134:saa7134_input_init1+890}<ffffffff802c585f>{driver_probe_device+79}<ffffffff8010df30>{tracesys+209}<ffffffff8010f82a>{show_stack+234}<ffffffff802288cd>{pci_device_probe+93}
       <ffffffff802c585f>{driver_probe_device+79} <ffffffff802c59ca>{__driver_attach+90}<ffffffff881b1e06>{:saa7134:saa7134_init+70}

[Patch 0/2] 2.6.15-rc1-mm2: disabling the pagecache for doing benchmarks

[Dirk Henning Gerdes]

For doing some benchmarks on the block-layer especially for the
I/O-Schedulers I thought it would be very useful, to turn off the
pagecache.
Therefore I implemented a global integer as bool for toggling it on and
off.
If "pagecache" is set "1" everything works as normal.
If it's set to "0" the pagecache is disabled by marking all pages as
not-uptodate to force the pagecache to load them again.

In the next step I wrote a module to get access to this bool via the
proc-fs.

It would be very nice if anybody could have a look on it.

Thanks

Dirk Gerdes
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