Re: OMAP3 ISP deadlocks on my new arm

[Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>]

Bastian Hecht wrote:
> Hello people,

Hi Bastian,

I'm cc'ing Laurent.

> I switched to the new DM3730 from IGEP and while it's supposed to be
> (almost) the same as the 3530 Version the isp deadlocks
> deterministically after I start capturing the second time with yavta.

Does the capture work the first time w/o issues?

> All extra locking debug output is enabled in the kernel .config.

I'm not fully certain on what this exactly is that you have below, but
it looks like your system is staying in interrupt context all the time.
My guess is that the ISP is producing interrupts that the driver is not
handling properly, causing the interrupt handler to be called again
immediately.

Do you have the same sensor working on OMAP 3530?

> I am unsure if this is an ISP thing or a problem in the
> interrupthandling software.

This has probably something to do with the ISP driver. :-)

> The first block is the watchdog that detects the deadlock. The last
> block is in the isp-code but how can it hang when trying to UNlock a
> spinlock? I am unsure about the 2nd block.
> The assembler code of __irq_svc is located in arch/arm/kernel/entry-armv.S
> Maybe I should try on linux-arm@lists.arm.linux.org.uk but I thought I
> give it a shot here first.
> 
> I use the omap3isp-2.6.35.3-omap3isp branch from Laurent.

Why so old kernel?

I think you'd be best off using this one:

<URL:http://git.linuxtv.org/pinchartl/media.git?a=shortlog;h=refs/heads/omap3isp-next-omap3isp>

> Any ideas? Thanks for any help,
> 
>  Bastian Hecht
> 
> 
> [  190.059509] BUG: soft lockup - CPU#0 stuck for 61s! [yavta:2224]
> [  190.065704] Kernel panic - not syncing: softlockup: hung tasks
> [  190.071563] [<c0031078>] (unwind_backtrace+0x0/0xe4) from
> [<c02baf24>] (panic+0x50/0xd0)
> [  190.079711] [<c02baf24>] (panic+0x50/0xd0) from [<c00729e4>]
> (softlockup_tick+0x134/0x158)
> [  190.088043] [<c00729e4>] (softlockup_tick+0x134/0x158) from
> [<c005612c>] (update_process_times+0x28/0x48)
> [  190.097656] [<c005612c>] (update_process_times+0x28/0x48) from
> [<c00697bc>] (tick_sched_timer+0x88/0xbc)
> [  190.107177] [<c00697bc>] (tick_sched_timer+0x88/0xbc) from
> [<c0061ff0>] (__run_hrtimer+0x44/0x84)
> [  190.116119] [<c0061ff0>] (__run_hrtimer+0x44/0x84) from
> [<c0062144>] (hrtimer_interrupt+0x114/0x2c8)
> [  190.125305] [<c0062144>] (hrtimer_interrupt+0x114/0x2c8) from
> [<c0035e20>] (omap2_gp_timer_interrupt+0x20/0x2c)
> [  190.135437] [<c0035e20>] (omap2_gp_timer_interrupt+0x20/0x2c) from
> [<c00730e4>] (handle_IRQ_event+0x24/0xe0)
> [  190.145324] [<c00730e4>] (handle_IRQ_event+0x24/0xe0) from
> [<c0074b80>] (handle_level_irq+0x90/0xfc)
> [  190.154510] [<c0074b80>] (handle_level_irq+0x90/0xfc) from
> [<c002c06c>] (asm_do_IRQ+0x6c/0x8c)
> [  190.163177] [<c002c06c>] (asm_do_IRQ+0x6c/0x8c) from [<c002c9f4>]
> (__irq_svc+0x34/0x80)
> [  190.171234] Exception stack(0xda413c98 to 0xda413ce0)
> [  190.176300] 3c80:
>     00000020 c03c20d0
> [  190.184509] 3ca0: 00000000 c0417240 da412000 00000002 00000000
> ded72e84 0000000a dec54640
> [  190.192718] 3cc0: c0417240 00000000 00000002 da413ce0 c0051bd4
> c0051ad8 20000113 ffffffff
> [  190.200958] [<c002c9f4>] (__irq_svc+0x34/0x80) from [<c0051ad8>]
> (__do_softirq+0x3c/0xf8)
> [  190.209167] [<c0051ad8>] (__do_softirq+0x3c/0xf8) from [<c0051bd4>]
> (irq_exit+0x40/0x8c)
> [  190.217315] [<c0051bd4>] (irq_exit+0x40/0x8c) from [<c002c070>]
> (asm_do_IRQ+0x70/0x8c)
> [  190.225280] [<c002c070>] (asm_do_IRQ+0x70/0x8c) from [<c002c9f4>]
> (__irq_svc+0x34/0x80)
> [  190.233306] Exception stack(0xda413d20 to 0xda413d68)
> [  190.238403] 3d20: defc4938 defc48c0 defc4084 ded72e84 ded72e14
> ded72e80 40000013 ded72e84
> [  190.246612] 3d40: ded72e68 dec54640 dedc5a38 00000000 defc40f8
> da413d68 bf01d4cc bf01d4ec
> [  190.254821] 3d60: 60000013 ffffffff
> [  190.258361] [<c002c9f4>] (__irq_svc+0x34/0x80) from [<bf01d4ec>]
> (omap3isp_video_queue_streamon+0x6c/0x7c [omap3_isp])
> [  190.269165] [<bf01d4ec>] (omap3isp_video_queue_streamon+0x6c/0x7c
> [omap3_isp]) from [<bf01f1d4>] (isp_video_streamon+0x150/0x1f8
> [omap3_isp])
> [  190.281951] [<bf01f1d4>] (isp_video_streamon+0x150/0x1f8
> [omap3_isp]) from [<c01fa76c>] (__video_do_ioctl+0x1488/0x3bd0)
> [  190.292877] [<c01fa76c>] (__video_do_ioctl+0x1488/0x3bd0) from
> [<c01f8ee8>] (__video_usercopy+0x2d0/0x414)
> [  190.302581] [<c01f8ee8>] (__video_usercopy+0x2d0/0x414) from
> [<c01f8370>] (v4l2_unlocked_ioctl+0x38/0x3c)
> [  190.312194] [<c01f8370>] (v4l2_unlocked_ioctl+0x38/0x3c) from
> [<c00a6d6c>] (vfs_ioctl+0x2c/0x6c)
> [  190.321044] [<c00a6d6c>] (vfs_ioctl+0x2c/0x6c) from [<c00a7448>]
> (do_vfs_ioctl+0x4cc/0x514)
> [  190.329437] [<c00a7448>] (do_vfs_ioctl+0x4cc/0x514) from
> [<c00a74c4>] (sys_ioctl+0x34/0x54)
> [  190.337829] [<c00a74c4>] (sys_ioctl+0x34/0x54) from [<c002ce40>]
> (ret_fast_syscall+0x0/0x30)
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Regards,

-- 
Sakari Ailus
sakari.ailus@maxwell.research.nokia.com