Just an update here: After looking at the code and the logs here, submitted a fix: https://lkml.org/lkml/2019/7/25/1432
I only added Dafna in the To-list but anyone is interested can find it in the maillist. Thanks Nicolin On Thu, Jul 25, 2019 at 11:27:45AM +0200, Dafna Hirschfeld wrote: > On Tue, 2019-07-23 at 14:05 +0000, Hans Verkuil (hansverk) wrote: > > On 7/23/19 3:14 PM, Dafna Hirschfeld wrote: > > > On Mon, 2019-07-22 at 08:38 -0300, Mauro Carvalho Chehab wrote: > > > > Em Mon, 22 Jul 2019 13:21:00 +0200 > > > > Dafna Hirschfeld <dafna.hirschf...@collabora.com> escreveu: > > > > > > > > > I loaded the vivid module with contiguous DMA and ran streaming > > > > > with > > > > > it with large image dimensions > > > > > [ 306.437327] Call Trace: > > > > > [ 306.437338] __dma_direct_alloc_pages+0xc9/0x1c0 > > > > > [ 306.437343] dma_direct_alloc_pages+0x24/0xf0 > > > > > [ 306.437348] dma_direct_alloc+0xe/0x10 > > > > > [ 306.437351] dma_alloc_attrs+0x84/0xd0 > > > > > > > > Hmm... we had a recent regression affecting other media devices, > > > > reported via Kaffeine mailing list: > > > > > > > > https://bugs.kde.org/show_bug.cgi?id=408004#c35 > > > > > > > > While this one was for S/G, maybe it is somewhat related. > > > > > > > > > > Also, I compiled vivid as built-in into the kernel (not as a > > > separate module) for nitrogen8m device (imx8) and > > > set it to use contig dma for mem_ops. Then I get a crash when > > > running the above command. > > > I use the master branch of > > > git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git > > > with this patch to vivid: > > > > > > diff --git a/drivers/media/platform/vivid/vivid-core.c > > > b/drivers/media/platform/vivid/vivid-core.c > > > index bc2a176937a4..0531f36d7d0a 100644 > > > --- a/drivers/media/platform/vivid/vivid-core.c > > > +++ b/drivers/media/platform/vivid/vivid-core.c > > > @@ -140,7 +140,7 @@ static bool no_error_inj; > > > module_param(no_error_inj, bool, 0444); > > > MODULE_PARM_DESC(no_error_inj, " if set disable the error > > > injecting controls"); > > > > > > -static unsigned int allocators[VIVID_MAX_DEVS] = { [0 ... > > > (VIVID_MAX_DEVS - 1)] = 0 }; > > > +static unsigned int allocators[VIVID_MAX_DEVS] = { [0 ... > > > (VIVID_MAX_DEVS - 1)] = 1 }; > > > module_param_array(allocators, uint, NULL, 0444); > > > MODULE_PARM_DESC(allocators, " memory allocator selection, default > > > is 0.\n" > > > "\t\t 0 == vmalloc\n" > > > > > > And then on the nitrogen8m device I get the following crash report > > > which seems to be related to the cma allocation > > > > > > ubuntu@bionic-dev64:~$ v4l2-ctl -d3 -v > > > width=2592,height=1944,pixelformat=UYVY,bytesperline=5184 --stream- > > > mmap --stream-to video.UYVY > > > [ 70.139006] cma: cma_alloc(cma (____ptrval____), count 4050, > > > align 8) > > > [ 70.159829] cma: cma_alloc(cma (____ptrval____), count 4050, > > > align 8) > > > [ 70.166292] cma: cma_alloc: alloc failed, req-size: 4050 pages, > > > ret: -12 > > > [ 70.173006] cma: number of available pages: 72@184+3886@4306=> > > > 3958 free of 8192 total pages > > > > So it looks like the CMA area is too small. Look at the > > CONFIG_CMA_SIZE_MBYTES > > setting. > > > > That explains why it fails. > > > > > [ 70.181471] cma: cma_alloc(): returned (____ptrval____) > > > [ 70.192449] cma: cma_alloc(cma (____ptrval____), count 4050, > > > align 8) > > > [ 70.198907] cma: cma_alloc: alloc failed, req-size: 4050 pages, > > > ret: -12 > > > [ 70.205625] cma: number of available pages: 72@184+3886@4306=> > > > 3958 free of 8192 total pages > > > [ 70.205733] systemd-journald[204]: > > > /var/log/journal/5cca8918401249538eacb5efd5b9b052/system.journal: > > > Journal file corrupted, rotating. > > > [ 70.214083] cma: cma_alloc(): returned (____ptrval____) > > > [ 70.219867] cma: cma_alloc(cma (____ptrval____), count 4050, > > > align 8) > > > [ 70.237878] cma: cma_alloc: alloc failed, req-size: 4050 pages, > > > ret: -12 > > > [ 70.244599] cma: number of available pages: 72@184+3886@4306=> > > > 3958 free of 8192 total pages > > > [ 70.253066] cma: cma_alloc(): returned (____ptrval____) > > > [ 70.264893] cma: cma_release(page (____ptrval____)) > > > [ 70.272871] cma: cma_release(page (____ptrval____)) > > > [ 70.277800] BUG: Bad page state in process v4l2-ctl pfn:b5a00 > > > > But that shouldn't lead to this. > > > > It could be a bug somewhere. > > > > Does it work fine if you use a smaller resolution? Perhaps there is > > something > > wrong in error handling in vb2. These corner cases are not exactly > > tested > > very often (or at all!). > > > > Regards, > > > > Hans > > Hi, I suspect that the error is in the cma code, the crash occurs first > after the commit ""dma-contiguous: add dma_{alloc,free}_contiguous() > helpers" > > Dafna > > > > > [ 70.283652] page:ffff7e0001d68000 refcount:13 mapcount:0 > > > mapping:0000000000000000 index:0x0 compound_mapcount: 0 > > > [ 70.293874] flags: 0xffff00000010000(head) > > > [ 70.297999] raw: 0ffff00000010000 dead000000000100 > > > dead000000000122 0000000000000000 > > > [ 70.305772] raw: 0000000000000000 0000000000000000 > > > 0000000dffffffff 0000000000000000 > > > [ 70.313526] page dumped because: nonzero _refcount > > > [ 70.318327] Modules linked in: > > > [ 70.321399] CPU: 2 PID: 482 Comm: v4l2-ctl Not tainted 5.3.0- > > > rc1+ #159 > > > [ 70.327927] Hardware name: Boundary Devices i.MX8MQ Nitrogen8M > > > (DT) > > > [ 70.334196] Call trace: > > > [ 70.336654] dump_backtrace+0x0/0x148 > > > [ 70.340319] show_stack+0x14/0x20 > > > [ 70.343640] dump_stack+0x9c/0xc4 > > > [ 70.346959] bad_page+0xe4/0x148 > > > [ 70.350188] free_pages_check_bad+0x70/0xa8 > > > [ 70.354375] __free_pages_ok+0x294/0x2b0 > > > [ 70.358301] __free_pages+0x38/0x50 > > > [ 70.361795] dma_free_contiguous+0x90/0x98 > > > [ 70.365892] __dma_direct_free_pages+0x18/0x20 > > > [ 70.370338] arch_dma_free+0x74/0x88 > > > [ 70.373916] dma_direct_free+0x4c/0x58 > > > [ 70.377668] dma_free_attrs+0x88/0xe0 > > > [ 70.381335] vb2_dc_put+0x44/0x60 > > > [ 70.384653] __vb2_buf_mem_free+0x68/0x110 > > > [ 70.388749] __vb2_queue_free+0x398/0x538 > > > [ 70.392763] vb2_core_queue_release+0x34/0x48 > > > [ 70.397122] _vb2_fop_release+0x88/0x98 > > > [ 70.400960] vb2_fop_release+0x28/0x50 > > > [ 70.404712] vivid_fop_release+0x88/0x208 > > > [ 70.408725] v4l2_release+0x6c/0xf0 > > > [ 70.412216] __fput+0x8c/0x1f8 > > > [ 70.415270] ____fput+0xc/0x18 > > > [ 70.418328] task_work_run+0x94/0xb0 > > > [ 70.421907] do_exit+0x2b0/0x9f8 > > > [ 70.425138] do_group_exit+0x34/0x98 > > > [ 70.428717] get_signal+0x104/0x678 > > > [ 70.432209] do_notify_resume+0x2ac/0x380 > > > [ 70.436220] work_pending+0x8/0x10 > > > [ 70.439648] Disabling lock debugging due to kernel taint > > > [ 70.444974] BUG: Bad page state in process v4l2-ctl pfn:b5a01 > > > [ 70.450822] page:ffff7e0001d68040 refcount:0 mapcount:0 > > > mapping:dead000000000400 index:0x1 compound_mapcount: 0 > > > [ 70.451427] printk: systemd: 27 output lines suppressed due to > > > ratelimiting > > > [ 70.460924] flags: 0xffff00000000000() > > > [ 70.460931] raw: 0ffff00000000000 ffff7e0001d68001 > > > ffffffff01d60301 dead000000000400 > > > [ 70.467945] Kernel panic - not syncing: Attempted to kill init! > > > exitcode=0x0000000b > > > [ 70.471659] raw: 0000000000000000 0000000000000000 > > > 00000000ffffffff 0000000000000000 > > > [ 70.479389] CPU: 1 PID: 1 Comm: systemd Tainted: > > > G B 5.3.0-rc1+ #159 > > > [ 70.479394] Hardware name: Boundary Devices i.MX8MQ Nitrogen8M > > > (DT) > > > [ 70.487058] page dumped because: non-NULL mapping > > > [ 70.494782] Call trace: > > > [ 70.494789] dump_backtrace+0x0/0x148 > > > [ 70.494793] show_stack+0x14/0x20 > > > [ 70.494799] dump_stack+0x9c/0xc4 > > > [ 70.502460] Modules linked in: > > > [ 70.508713] panic+0x140/0x32c > > > [ 70.508718] complete_and_exit+0x0/0x20 > > > [ 70.508724] do_group_exit+0x34/0x98 > > > [ 70.539649] get_signal+0x104/0x678 > > > [ 70.543139] do_notify_resume+0x2ac/0x380 > > > [ 70.547149] work_pending+0x8/0x10 > > > [ 70.550553] CPU: 2 PID: 482 Comm: v4l2-ctl Tainted: > > > G B 5.3.0-rc1+ #159 > > > [ 70.550554] SMP: stopping secondary CPUs > > > [ 70.562387] Hardware name: Boundary Devices i.MX8MQ Nitrogen8M > > > (DT) > > > [ 70.568653] Call trace: > > > [ 70.571103] dump_backtrace+0x0/0x148 > > > [ 70.574765] show_stack+0x14/0x20 > > > [ 70.578081] dump_stack+0x9c/0xc4 > > > [ 70.581398] bad_page+0xe4/0x148 > > > [ 70.584627] free_pages_check_bad+0x70/0xa8 > > > [ 70.588814] __free_pages_ok+0x294/0x2b0 > > > [ 70.592737] __free_pages+0x38/0x50 > > > [ 70.596229] dma_free_contiguous+0x90/0x98 > > > [ 70.600327] __dma_direct_free_pages+0x18/0x20 > > > [ 70.604771] arch_dma_free+0x74/0x88 > > > [ 70.608347] dma_direct_free+0x4c/0x58 > > > [ 70.612098] dma_free_attrs+0x88/0xe0 > > > [ 70.615765] vb2_dc_put+0x44/0x60 > > > [ 70.619082] __vb2_buf_mem_free+0x68/0x110 > > > [ 70.623180] __vb2_queue_free+0x398/0x538 > > > [ 70.627192] vb2_core_queue_release+0x34/0x48 > > > [ 70.631551] _vb2_fop_release+0x88/0x98 > > > [ 70.635387] vb2_fop_release+0x28/0x50 > > > [ 70.639138] vivid_fop_release+0x88/0x208 > > > [ 70.643149] v4l2_release+0x6c/0xf0 > > > [ 70.646638] __fput+0x8c/0x1f8 > > > [ 70.649693] ____fput+0xc/0x18 > > > [ 70.652750] task_work_run+0x94/0xb0 > > > [ 70.656326] do_exit+0x2b0/0x9f8 > > > [ 70.659554] do_group_exit+0x34/0x98 > > > [ 70.663130] get_signal+0x104/0x678 > > > [ 70.666621] do_notify_resume+0x2ac/0x380 > > > [ 70.670632] work_pending+0x8/0x10 > > > [ 70.674036] Kernel Offset: disabled > > > [ 70.677526] CPU features: 0x0002,2000200c > > > [ 70.681535] Memory Limit: none > > > [ 70.684599] ---[ end Kernel panic - not syncing: Attempted to > > > kill init! exitcode=0x0000000b ]--- > > > > > > Dafna > > > > > > > Thanks, > > > > Mauro
