Hello, When fuzzing the Linux kernel driver v6.0-rc6, the following crash was triggered. HEAD commit: 521a547ced6477c54b4b0cc206000406c221b4d6 git tree: upstream kernel config: https://pastebin.com/raw/hekxU61F console output: https://pastebin.com/raw/ZSCg16sG Sorry for failing to extract the reproducer. But on other versions of Linux, I also triggered this crash. I would appreciate it if you have any idea how to solve this bug. The crash report is as follows: msi2500 2-1:1.0: failed -32, cmd 41, data 608008 usb 2-1: selecting invalid altsetting 1 msi2500 2-1:1.0: failed -32, cmd 43, data 0000 ------------[ cut here ]------------ WARNING: CPU: 1 PID: 18451 at drivers/media/common/videobuf2/videobuf2-core.c:1612 vb2_start_streaming+0x246/0x4c0 drivers/media/common/videobuf2/videobuf2-core.c:1612 Modules linked in: CPU: 1 PID: 18451 Comm: syz-fuzzer Not tainted 6.0.0-rc4+ #20 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:vb2_start_streaming+0x246/0x4c0 drivers/media/common/videobuf2/videobuf2-core.c:1612 Code: 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 04 02 00 00 48 8b 83 60 02 00 00 48 39 c5 74 0c e8 9a 5a 63 fb <0f> 0b eb 03 45 31 e4 e8 8e 5a 63 fb 44 89 e0 48 83 c4 10 5b 5d 41 RSP: 0018:ffffc9001457fb18 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88804eb987f0 RCX: ffff88801ab91d40 RDX: 0000000000000000 RSI: ffff88801ab91d40 RDI: 0000000000000002 RBP: ffff88804eb98a50 R08: ffffffff86178d96 R09: 0000000000000000 R10: 0000000000000005 R11: ffffed1009d73149 R12: 00000000ffffffe0 R13: 0000000000000000 R14: 0000000000000008 R15: 0000000000000008 FS: 000000c001d53090(0000) GS:ffff88807ec00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f620c0431a8 CR3: 000000001d598000 CR4: 0000000000350ee0 Call Trace: <TASK> vb2_core_streamon drivers/media/common/videobuf2/videobuf2-core.c:2113 [inline] vb2_core_streamon+0x1da/0x2c0 drivers/media/common/videobuf2/videobuf2-core.c:2080 __vb2_init_fileio+0xa18/0xcf0 drivers/media/common/videobuf2/videobuf2-core.c:2685 vb2_core_poll+0x4d2/0x7c0 drivers/media/common/videobuf2/videobuf2-core.c:2465 vb2_poll+0x31/0x150 drivers/media/common/videobuf2/videobuf2-v4l2.c:970 vb2_fop_poll+0x10e/0x360 drivers/media/common/videobuf2/videobuf2-v4l2.c:1217 v4l2_poll+0x158/0x220 drivers/media/v4l2-core/v4l2-dev.c:348 vfs_poll include/linux/poll.h:88 [inline] ep_item_poll.isra.0+0xd8/0x170 fs/eventpoll.c:853 ep_insert fs/eventpoll.c:1522 [inline] do_epoll_ctl+0x1bc4/0x3080 fs/eventpoll.c:2163 __do_sys_epoll_ctl fs/eventpoll.c:2214 [inline] __se_sys_epoll_ctl fs/eventpoll.c:2205 [inline] __x64_sys_epoll_ctl+0x13f/0x1c0 fs/eventpoll.c:2205 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x466938 Code: 10 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 8b 7c 24 08 8b 74 24 0c 8b 54 24 10 4c 8b 54 24 18 b8 e9 00 00 00 0f 05 <89> 44 24 20 c3 cc cc cc 8b 7c 24 08 48 8b 74 24 10 8b 54 24 18 44 RSP: 002b:000000c0042bda88 EFLAGS: 00000206 ORIG_RAX: 00000000000000e9 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000466938 RDX: 000000000000002d RSI: 0000000000000001 RDI: 0000000000000003 RBP: 000000c0042bdad8 R08: 0000000000000000 R09: 0000000000000060 R10: 000000c0042bdac4 R11: 0000000000000206 R12: 0000000000203000 R13: 0000000000000050 R14: 000000c000092340 R15: 00007f94d7f54c87 </TASK>
