When using raid1 with one local member and one nbd member (marked as write-mostly) MD hangs when trying to format /dev/md0 with ext3. Both 'cat /proc/mdstat' and 'mdadm --detail /dev/md0' hang infinitely. I've not tried to reproduce on 2.6.18 or 2.6.19ish kernel.org kernels yet but this issue affects both SLES10 and RHEL5. sysrq traces for RHEL5 follow; I don't have immediate access to a SLES10 system at the moment but I've seen this same hang with SLES10 SP1 RC4: cat /proc/mdstat cat S ffff8100048e7de8 6208 11428 11391 (NOTLB) ffff8100048e7de8 00000000076eb000 ffffffff80098ea6 0000000000000008 ffff81001ff170c0 ffff810037e17100 00045f8d13924085 000000000006b89f ffff81001ff17290 0000000000000001 0000000000000005 00000000ffffffff Call Trace: [<ffffffff80098ea6>] seq_printf+0x67/0x8f [<ffffffff80233df5>] __mutex_lock_interruptible_slowpath+0x7f/0xbc [<ffffffff801be644>] md_seq_show+0x123/0x6aa [<ffffffff8009939f>] seq_read+0x1b8/0x28d [<ffffffff8007b7a8>] vfs_read+0xcb/0x171 [<ffffffff8007bb87>] sys_read+0x45/0x6e [<ffffffff800097e1>] tracesys+0xd1/0xdc /sbin/mdadm --detail /dev/md0 mdadm S ffff810035a1dd78 6384 3829 3828 (NOTLB) ffff810035a1dd78 ffff81003f4570c0 ffffffff80094e4d 0000000000000001 ffff81000617c870 ffff810037e17100 00043e667c800afe 000000000005ae94 ffff81000617ca40 0000000000000001 0000000000000021 00000000ffffffff Call Trace: [<ffffffff80094e4d>] mntput_no_expire+0x19/0x89 [<ffffffff80233df5>] __mutex_lock_interruptible_slowpath+0x7f/0xbc [<ffffffff801be4e7>] md_open+0x2e/0x68 [<ffffffff80082560>] do_open+0x216/0x316 [<ffffffff8008280b>] blkdev_open+0x0/0x4f [<ffffffff8008282e>] blkdev_open+0x23/0x4f [<ffffffff80079889>] __dentry_open+0xd9/0x1dc [<ffffffff80079a40>] do_filp_open+0x2d/0x3d [<ffffffff80079a94>] do_sys_open+0x44/0xbe [<ffffffff800097e1>] tracesys+0xd1/0xdc I can provided more detailed information; please just ask. thanks, Mike - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
