Re: 2.6.21-rc2-git3 oops snd_intel8x0_interrupt+0x104/0x1dc [snd_intel8x0] (crashdump kernel)

[Takashi Iwai]

At Mon, 05 Mar 2007 19:07:50 +0100,
Michal Piotrowski wrote:
> 
> Hi,
> 
> I hit this bug on crashdump kernel
> 
> [ 8450.127374] divide error: 0000 [#1]
> [ 8450.130876] PREEMPT 
> [ 8450.133098] Modules linked in: snd_intel8x0 snd_ac97_codec 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 evdev intel_agp soundcore agpgart snd_page_alloc i2c_i801 skge rtc_cmos rtc_core rtc_lib ide_cd cdrom rtc unix
> [ 8450.159726] CPU:    0
> [ 8450.159727] EIP:    0060:[<ca903276>]    Not tainted VLI
> [ 8450.159728] EFLAGS: 00010046   (2.6.21-rc2-git3 #12)
> [ 8450.172304] EIP is at snd_intel8x0_interrupt+0x104/0x1dc [snd_intel8x0]
> [ 8450.178921] eax: 00000000   ebx: c22f3590   ecx: 0000000e   edx: 00000000
> [ 8450.185707] esi: c22f34f8   edi: 00700140   ebp: c2b47ce8   esp: c2b47cc0
> [ 8450.192501] ds: 007b   es: 007b   fs: 00d8  gs: 0033  ss: 0068
> [ 8450.198338] Process modprobe (pid: 1336, ti=c2b47000 task=c1e12070 task.ti=c2b47000)
> [ 8450.205900] Stack: 00000001 c3197ab4 0000000e c165e6b6 0000000f 00000010 c22f37c0 00000202 
> [ 8450.214466]        c3197ab8 00000020 c2b47d08 c1643230 ca903172 0000000a 012f37f8 c22f34f8 
> [ 8450.223032]        070000e0 00000001 c2b47dd4 ca902144 c26b44ac c22f34f8 c1e125f8 c1e12070 
> [ 8450.231590] Call Trace:
> [ 8450.234252]  [<c1604556>] show_trace_log_lvl+0x1a/0x2f
> [ 8450.239430]  [<c1604608>] show_stack_log_lvl+0x9d/0xa5
> [ 8450.244600]  [<c16047fd>] show_registers+0x1ed/0x32c
> [ 8450.249597]  [<c1604a43>] die+0x107/0x21e
> [ 8450.253640]  [<c1604bd3>] do_trap+0x79/0x91
> [ 8450.257860]  [<c160523a>] do_divide_error+0x94/0x9e
> [ 8450.262769]  [<c17fb54c>] error_code+0x74/0x7c
> [ 8450.267247]  [<c1643230>] request_irq+0xac/0xf4
> [ 8450.271811]  [<ca902144>] snd_intel8x0_probe+0x482/0xffb [snd_intel8x0]
> [ 8450.278459]  [<c16e78c5>] pci_device_probe+0x39/0x5b
> [ 8450.283455]  [<c173e633>] really_probe+0xbd/0x145
> [ 8450.288193]  [<c173e750>] driver_probe_device+0x95/0xa1
> [ 8450.293448]  [<c173e865>] __driver_attach+0x6a/0xa1
> [ 8450.298358]  [<c173dc61>] bus_for_each_dev+0x36/0x5b
> [ 8450.303354]  [<c173e4a7>] driver_attach+0x19/0x1b
> [ 8450.308091]  [<c173df0e>] bus_add_driver+0x6a/0x170
> [ 8450.313001]  [<c173ea70>] driver_register+0x79/0x7e
> [ 8450.317910]  [<c16e7a43>] __pci_register_driver+0x7c/0xa9
> [ 8450.323338]  [<ca909017>] alsa_card_intel8x0_init+0x17/0x19 [snd_intel8x0]
> [ 8450.330246]  [<c16366ad>] sys_init_module+0x11b0/0x12f0
> [ 8450.335502]  [<c1603e72>] sysenter_past_esp+0x5f/0x99
> [ 8450.340584]  =======================
> [ 8450.344172] Code: 29 c1 89 c8 83 c0 20 83 f9 ff 0f 4f c1 89 45 e0 89 53 38 8b 45 e0 0f af 43 20 03 43 24 89 43 24 f6 86 8c 02 00 00 40 75 08 31 d2 <f7> 73 18 89 53 24 8b 45 e0 03 43 30 83 e0 1f 89 43 30 8b 55 ec 
> [ 8450.364659] EIP: [<ca903276>] snd_intel8x0_interrupt+0x104/0x1dc [snd_intel8x0] SS:ESP 0068:c2b47cc0
> [ 8450.373849] note: modprobe[1336] exited with preempt_count 1
> [ 8450.379518] BUG: sleeping function called from invalid context at kernel/rwsem.c:20
> [ 8450.387175] in_atomic():1, irqs_disabled():1
> [ 8450.391455] 1 lock held by modprobe/1336:
> [ 8450.395474]  #0:  (&chip->reg_lock){....}, at: [<ca9031fe>] snd_intel8x0_interrupt+0x8c/0x1dc [snd_intel8x0]
> [ 8450.405416] irq event stamp: 15590
> [ 8450.408828] hardirqs last  enabled at (15589): [<c165e6a2>] kmem_cache_alloc+0x89/0xa9
> [ 8450.416798] hardirqs last disabled at (15590): [<c1643227>] request_irq+0xa3/0xf4
> [ 8450.424329] softirqs last  enabled at (15566): [<c161a81e>] __do_softirq+0xa5/0xaa
> [ 8450.431943] softirqs last disabled at (15561): [<c1605cb7>] do_softirq+0x5b/0xc8

Hmm, it might be a race...
Does the patch below fix the problem?


thanks,

Takashi

diff -r bf193701a812 sound/pci/intel8x0.c
--- a/sound/pci/intel8x0.c	Mon Feb 26 16:07:42 2007 +0100
+++ b/sound/pci/intel8x0.c	Wed Mar 07 14:40:58 2007 +0100
@@ -725,10 +725,11 @@ static inline void snd_intel8x0_update(s
 static inline void snd_intel8x0_update(struct intel8x0 *chip, struct ichdev *ichdev)
 {
 	unsigned long port = ichdev->reg_offset;
+	unsigned long flags;
 	int status, civ, i, step;
 	int ack = 0;
 
-	spin_lock(&chip->reg_lock);
+	spin_lock_irqsave(&chip->reg_lock, flags);
 	status = igetbyte(chip, port + ichdev->roff_sr);
 	civ = igetbyte(chip, port + ICH_REG_OFF_CIV);
 	if (!(status & ICH_BCIS)) {
@@ -768,7 +769,7 @@ static inline void snd_intel8x0_update(s
 			ack = 1;
 		}
 	}
-	spin_unlock(&chip->reg_lock);
+	spin_unlock_irqrestore(&chip->reg_lock, flags);
 	if (ack && ichdev->substream) {
 		snd_pcm_period_elapsed(ichdev->substream);
 	}
-
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