Date: Tue, 13 Jan 2026 02:24:38 +0000 From: bugzilla-noreply@freebsd.org To: gnome@FreeBSD.org Subject: [Bug 287078] multimedia/cheese: fails to show images/video for a working webcam Message-ID: <bug-287078-6497-YxkEYdzJsS@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-287078-6497@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287078 --- Comment #4 from Marcin Cieślak <saper@saper.info> --- Thread 20 hit Breakpoint 1, vb2_core_expbuf (q=0x801e872e0, fd=0x7fffddbebcc0, type=1, index=0, plane=0, flags=1048578) at media_tree/drivers/media/common/videobuf2/videobuf2-core.c:2192 2192 struct vb2_buffer *vb = NULL; (gdb) bt #0 vb2_core_expbuf (q=0x801e872e0, fd=0x7fffddbebcc0, type=1, index=0, plane=0, flags=1048578) at media_tree/drivers/media/common/videobuf2/videobuf2-core.c:2192 #1 0x00000000014c0a2e in vb2_expbuf (q=0x801e872e0, eb=0x7fffddbebcb0) at media_tree/drivers/media/common/videobuf2/videobuf2-v4l2.c:877 #2 0x000000000153ef8d in uvc_export_buffer (queue=0x801e872e0, exp=0x7fffddbebcb0) at media_tree/drivers/media/usb/uvc/uvc_queue.c:314 #3 0x00000000015400e3 in uvc_ioctl_expbuf (file=0x803c03020, fh=0x803c1c000, exp=0x7fffddbebcb0) at media_tree/drivers/media/usb/uvc/uvc_v4l2.c:805 #4 0x0000000001453f01 in v4l_stub_expbuf (ops=0x1675fe0 <uvc_ioctl_ops>, file=0x803c03020, fh=0x803c1c000, p=0x7fffddbebcb0) at media_tree/drivers/media/v4l2-core/v4l2-ioctl.c:2733 #5 0x000000000145290a in __video_do_ioctl (file=0x803c03020, cmd=3225441808, arg=0x7fffddbebcb0) at media_tree/drivers/media/v4l2-core/v4l2-ioctl.c:2979 #6 0x0000000001451aac in video_usercopy (file=0x803c03020, orig_cmd=3225441808, arg=65536, func=0x14526b0 <__video_do_ioctl>) at media_tree/drivers/media/v4l2-core/v4l2-ioctl.c:3327 #7 0x00000000014526aa in video_ioctl2 (file=0x803c03020, cmd=3225441808, arg=65536) at media_tree/drivers/media/v4l2-core/v4l2-ioctl.c:3375 #8 0x0000000001450ec9 in v4l2_ioctl (filp=0x803c03020, cmd=3225441808, arg=65536) at media_tree/drivers/media/v4l2-core/v4l2-dev.c:374 #9 0x00000000011f92c1 in linux_ioctl (handle=0x803c03000, fflags=0, cmd=3225441808, arg=0x10000) at kernel/linux_file.c:158 #10 0x00000000016457e7 in v4b_ioctl (cdev=0x801e47030, fflags=3, cmd=3225441808, peer_data=0x10000) at webcamd.c:301 #11 0x00000008017391de in cuse_wait_and_process () at /usr/src/lib/libcuse/cuse_lib.c:549 #12 0x0000000001644dd4 in v4b_work (arg=0x0) at webcamd.c:145 #13 0x00000008016feecb in thread_start (curthread=0x801aca810) at /usr/src/lib/libthr/thread/thr_create.c:299 #14 0x0000000000000000 in ?? () Backtrace stopped: Cannot access memory at address 0x7fffddbec000 (gdb) p *q $12 = {type = 1, io_modes = 19, dev = 0x0, dma_attrs = 0, bidirectional = 0, fileio_read_once = 0, fileio_write_immediately = 0, allow_zero_bytesused = 0, quirk_poll_must_check_waiting_for_buffers = 1, supports_requests = 0, requires_requests = 0, uses_qbuf = 0, uses_requests = 0, allow_cache_hints = 0, non_coherent_mem = 0, lock = 0x801e87510, owner = 0x0, ops = 0x1675f80 <uvc_queue_qops>, mem_ops = 0x166d198 <vb2_vmalloc_memops>, buf_ops = 0x166d158 <v4l2_buf_ops>, drv_priv = 0x801e872e0, subsystem_flags = 0, buf_struct_size = 984, timestamp_flags = 73728, gfp_flags = 0, min_buffers_needed = 0, alloc_devs = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, mmap_lock = {sem = {value = 1, owner = 0xffffffffffffffff}}, memory = 1, dma_dir = (unknown: 0x1), bufs = {0x803802000, 0x803802400, 0x803802800, 0x803802c00, 0x0 <repeats 28 times>}, num_buffers = 4, queued_list = {next = 0x801e874a8, prev = 0x801e874a8}, queued_count = 0, owned_by_drv_count = {counter = 0}, done_list = { next = 0x801e874c0, prev = 0x801e874c0}, done_lock = {<No data fields>}, done_wq = { sleep_ref = 5, sleep_count = 0, do_selwakeup = 0}, streaming = 0, start_streaming_called = 0, error = 0, waiting_for_buffers = 1, waiting_in_dqbuf = 0, is_multiplanar = 0, is_output = 0, copy_timestamp = 0, last_buffer_dequeued = 0, fileio = 0x0, threadio = 0x0, name = "cap-0x801e872e0", '\000' <repeats 16 times>} (gdb) p q->memory $13 = 1 (gdb) n 2197 if (q->memory != VB2_MEMORY_MMAP) { (gdb) 2202 if (!q->mem_ops->get_dmabuf) { (gdb) 2203 dprintk(q, 1, "queue does not support DMA buffer exporting\n"); (gdb) p *q->mem_ops $14 = {alloc = 0x14c2bf0 <vb2_vmalloc_alloc>, put = 0x14c2cf0 <vb2_vmalloc_put>, get_dmabuf = 0x0, get_userptr = 0x0, put_userptr = 0x0, prepare = 0x0, finish = 0x0, attach_dmabuf = 0x14c2d40 <vb2_vmalloc_attach_dmabuf>, detach_dmabuf = 0x14c2df0 <vb2_vmalloc_detach_dmabuf>, map_dmabuf = 0x14c2e60 <vb2_vmalloc_map_dmabuf>, unmap_dmabuf = 0x14c2ee0 <vb2_vmalloc_unmap_dmabuf>, vaddr = 0x14c2f50 <vb2_vmalloc_vaddr>, cookie = 0x0, num_users = 0x14c2f90 <vb2_vmalloc_num_users>, mmap = 0x14c2fc0 <vb2_vmalloc_mmap>} -- You are receiving this mail because: You are the assignee for the bug.home | help
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