[Xen-bugs] [Bug 220] New: full disk vbd access hangs in domU

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=220

           Summary: full disk vbd access hangs in domU
           Product: Xen
           Version: unstable
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: critical
          Priority: P2
         Component: Guest-OS
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: katzj@xxxxxxxxxx


Setting up a full disk vbd (disk = [ 'phy:sdb,xvda,w' ] for the specific trace
in question) hangs during the partition check.  sysrq-t for the blocked thread
looks like

kxbwatch      D C1083CE0     0     7      6            11       (L-TLB)
c03bbbf8 00000246 c03abaf0 c1083ce0 c3bb5e38 00000000 c03abc14 002d1db9
       00000000 c03ba000 c03ba000 00009298 c03abaf0 c1083ce0 11e8545c
000055ea
       c03ba000 0002cd4d c0227ecc 11bea3a0 000055ea c02e4ba0 00000000
c3bb5e38
Call Trace:
 [<c0227ecc>] elv_next_request+0x15/0x1a7
 [<c02a1f31>] io_schedule+0x26/0x30
 [<c013db35>] sync_page+0x3d/0x4a
 [<c02a2202>] __wait_on_bit_lock+0x42/0x62
 [<c013daf8>] sync_page+0x0/0x4a
 [<c013e33e>] __lock_page+0x5c/0x63
 [<c0133f22>] wake_bit_function+0x0/0x34
 [<c013ff1e>] read_cache_page+0x1c2/0x362
 [<c0168748>] blkdev_get_block+0x0/0x48
 [<c0193db6>] read_dev_sector+0x4a/0x116
 [<c016888a>] blkdev_readpage+0x0/0x15
 [<c0194284>] msdos_partition+0x4e/0x39a
 [<c0193659>] disk_name+0xa9/0xb3
 [<c01937bc>] check_partition+0xef/0x16b
 [<c0193ce0>] rescan_partitions+0xc6/0x152
 [<c01691b2>] do_open+0x18e/0x3f1
 [<c01694aa>] blkdev_get+0x95/0xa0
 [<c0193bf8>] register_disk+0x117/0x139
 [<c022dca6>] add_disk+0x5f/0x84
 [<c022dc25>] exact_match+0x0/0xa
 [<c022dc2f>] exact_lock+0x0/0x18
 [<c023b7c3>] xlvbd_alloc_gendisk+0x13a/0x1de
 [<c023b8e6>] xlvbd_add+0x7f/0x93
 [<c0239218>] watch_thread+0x0/0x169
 [<c023ad20>] watch_for_status+0xb7/0x11b
 [<c02392fa>] watch_thread+0xe2/0x169
 [<c0118ed5>] complete+0x42/0x52
 [<c0133ed7>] autoremove_wake_function+0x0/0x4b
 [<c0133a3d>] kthread+0xaf/0xb3
 [<c013398e>] kthread+0x0/0xb3
 [<c0107801>] kernel_thread_helper+0x5/0xb

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