From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.1) Gecko/20020826 Description of problem: I burn ext2 filesystems on an ide cd-burner. To mount the cd I have to mount with the -o loopback option. The files are there, ls shows them all, but running less /mnt/cdrom1/filename.txt will cause a kernel oops. The machine has to be shutdown, since none of the kernel module will unload, to get the cd out of the cdrw drive. The cd can then be put into a normal ide cd drive, and mounted loop back. The files on the cd can then be inspected with less and cat etc... The cd seems to be burned fine, I also used dd to verify that the cdimage is the same as the hard drive image burned. I just seems to be a loopback + ide-scsi issue. I have done this on two computers, 1 with a normal drive + cdrw, and one with a cdrw only. It is a painful bug for me on the machine with a cdrw only. Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: 1. burn and ext2 cd 2. mount it in an ide cd-burner 3. less a file on the cd Actual Results: kernel oops appears in dmesg output, to get cd out/ use drive again must cycle power. Expected Results: less should show the text of the files Additional info: Sep 24 19:25:45 emacir kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000000 Sep 24 19:25:45 emacir kernel: printing eip: Sep 24 19:25:45 emacir kernel: e0b3b546 Sep 24 19:25:45 emacir kernel: *pde = 00000000 Sep 24 19:25:45 emacir kernel: Oops: 0000 Sep 24 19:25:45 emacir kernel: sg loop ppp_deflate zlib_deflate ppp_async ppp_ge neric slhc sr_mod i810_audio Sep 24 19:25:45 emacir kernel: CPU: 0 Sep 24 19:25:45 emacir kernel: EIP: 0010:[<e0b3b546>] Tainted: PF Sep 24 19:25:45 emacir kernel: EFLAGS: 00010202 Sep 24 19:25:45 emacir kernel: Sep 24 19:25:45 emacir kernel: EIP is at sr_scatter_pad [sr_mod] 0x1b6 (2.4.18-1 0) Sep 24 19:25:45 emacir kernel: eax: 00000034 ebx: 00000000 ecx: 0000000d e dx: 00000000 Sep 24 19:25:45 emacir kernel: esi: 00000000 edi: c0377718 ebp: c0377600 e sp: df4c5cc8 Sep 24 19:25:45 emacir kernel: ds: 0018 es: 0018 ss: 0018 Sep 24 19:25:45 emacir kernel: Process mtvp (pid: 2189, stackpage=df4c5000) Sep 24 19:25:45 emacir kernel: Stack: 00000000 c0377718 c0377200 00000000 000004 00 00000000 c0377000 00000800 Sep 24 19:25:45 emacir kernel: db600000 00000000 00002207 e0b3b7e5 db6000 00 00000800 00002207 00000000 Sep 24 19:25:45 emacir kernel: db600000 e0b3f120 df284f20 df284f20 e08a94 fe db600000 e0b3f120 dfd973c0 Sep 24 19:25:45 emacir kernel: Call Trace: [<e0b3b7e5>] sr_init_command [sr_mod] 0x175 Sep 24 19:25:45 emacir kernel: [<e0b3f120>] sr_template [sr_mod] 0x0 Sep 24 19:25:45 emacir kernel: [<e08a94fe>] scsi_request_fn [scsi_mod] 0x25e Sep 24 19:25:45 emacir kernel: [<e0b3f120>] sr_template [sr_mod] 0x0 Sep 24 19:25:45 emacir kernel: [<c018585e>] generic_unplug_device [kernel] 0x1e Sep 24 19:25:45 emacir kernel: [<c011bd59>] __run_task_queue [kernel] 0x49 Sep 24 19:25:45 emacir kernel: [<c0139a56>] __wait_on_buffer [kernel] 0x56 Sep 24 19:25:45 emacir kernel: [<c013a6f8>] getblk [kernel] 0x18 Sep 24 19:25:45 emacir kernel: [<c013a972>] bread [kernel] 0x52 Sep 24 19:25:45 emacir kernel: [<c015e3c2>] ext2_get_branch [kernel] 0x52 Sep 24 19:25:45 emacir kernel: [<c015e659>] ext2_get_block [kernel] 0x59 Sep 24 19:25:45 emacir kernel: [<c018663a>] generic_make_request [kernel] 0x10a Sep 24 19:25:45 emacir kernel: [<c013ad59>] create_empty_buffers [kernel] 0x19 Sep 24 19:25:45 emacir kernel: [<c013b4ec>] block_read_full_page [kernel] 0xec Sep 24 19:25:45 emacir kernel: [<c0128acd>] add_to_page_cache_unique [kernel] 0x 6d Sep 24 19:25:45 emacir kernel: [<c0128b68>] page_cache_read [kernel] 0x88 Sep 24 19:25:45 emacir kernel: [<c015e600>] ext2_get_block [kernel] 0x0 Sep 24 19:25:45 emacir kernel: [<c0129247>] generic_file_readahead [kernel] 0x11 7 Sep 24 19:25:45 emacir kernel: [<c01295d3>] do_generic_file_read [kernel] 0x2e3 Sep 24 19:25:45 emacir kernel: [<c0146986>] do_select [kernel] 0x226 Sep 24 19:25:45 emacir kernel: [<c0129a8e>] generic_file_read [kernel] 0x7e Sep 24 19:25:45 emacir kernel: [<c0129930>] file_read_actor [kernel] 0x0 Sep 24 19:25:45 emacir kernel: [<c0138bb6>] sys_read [kernel] 0x96 Sep 24 19:25:45 emacir kernel: [<c0108913>] system_call [kernel] 0x33 Sep 24 19:25:45 emacir kernel: Sep 24 19:25:45 emacir kernel: Sep 24 19:25:45 emacir kernel: Code: f3 a5 a8 02 74 02 66 a5 a8 01 74 01 a4 8b 54 24 30 0f b7 82
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