Hi
When I create a linear device with two small disk(less then 576K),
a segmentation fault occurs. follow message:
md: bind<hda>
md: bind<hdb>
divide error: 0000 [#1]
Modules linked in:
Pid: 251, comm: mdadm.static Not tainted (2.6.27.4 #2)
EIP: 0060:[<c02ee9d0>] EFLAGS: 00000202 CPU: 0
EIP is at linear_conf+0x1e0/0x2f0
EAX: 00000381 EBX: 00000000 ECX: 00000000 EDX: 00000000
ESI: 00000001 EDI: c6d571e0 EBP: 00000001 ESP: c6d83c64
DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068
Process mdadm.static (pid: 251, ti=c6d82000 task=c781ca30 task.ti=c6d82000)
Stack: c02f1273 00000380 00000002 c6d5a400 c6d5a410 c032c7b0 c032c7b0 00000002
00d5bc6c c6d5a400 ffffffff c6d5a484 c6d5a400 c02eebc2 c035d0c0 c02f670d
c0336ed0 ffffffff c6d81cf0 c7482ec8 00000000 00000001 c6d5a410 c6d5a200
Call Trace:
[<c02f1273>] mddev_put+0x13/0x70
[<c02eebc2>] linear_run+0x22/0x80
[<c02f670d>] do_md_run+0x3bd/0x960
[<c0276ed9>] bd_claim_by_disk+0x1a9/0x280
[<c02f31f9>] bind_rdev_to_array+0x1d9/0x270
[<c023497c>] handle_level_irq+0x6c/0xa0
[<c0204f79>] do_IRQ+0x39/0x70
[<c02a3680>] cfq_merged_request+0x0/0x60
[<c02f8f00>] md_ioctl+0x1530/0x1a10
[<c0203193>] common_interrupt+0x23/0x28
[<c02e2910>] task_no_data_intr+0x0/0x80
[<c02de2aa>] ide_execute_command+0x4a/0x60
[<c02e2485>] do_rw_taskfile+0x1a5/0x250
[<c02deb72>] ide_wait_stat+0x42/0x90
[<c02991f2>] elv_queue_empty+0x22/0x30
[<c02dc53a>] ide_do_request+0x9a/0xa00
[<c029ae58>] submit_bio+0x48/0xd0
[<c0299447>] elv_drain_elevator+0x17/0x60
[<c029ba51>] __generic_unplug_device+0x11/0x40
[<c02f79d0>] md_ioctl+0x0/0x1a10
[<c029edad>] blkdev_driver_ioctl+0x5d/0x60
[<c029f051>] blkdev_ioctl+0x2a1/0x820
[<c029af7b>] __freed_request+0x9b/0xa0
[<c029afa4>] freed_request+0x24/0x50
[<c02e1c58>] ide_raw_taskfile+0x78/0x90
[<c02e1c88>] ide_no_data_taskfile+0x18/0x20
[<c02e505f>] ide_cacheflush_p+0x5f/0x90
[<c02e55de>] ide_disk_put+0x2e/0x50
[<c02e5693>] idedisk_release+0x43/0xb0
[<c0276ab5>] block_ioctl+0x15/0x20
[<c0276aa0>] block_ioctl
I found the code in linear.c: +200
round = sector_div(sz, base);
the base can be ZERO when the device is too small. So I think this is
a bug or I did something wrong, please tell me. Thanks a lot .
I did the test with qemu-0.90, kernel 2.6.27.4 and mdadm 2.6.7 static linked.
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