linux-kernel - tasks getting stuck on mmap

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Message-Id: <20100816.211218.189709876.davem@davemloft.net>
Date:	Mon, 16 Aug 2010 21:12:18 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	linux-kernel@...r.kernel.org
CC:	torvalds@...ux-foundation.org
Subject: tasks getting stuck on mmap_sem?


I just started seeing this with current GIT, is it related
to the page table locking shuffle of a few days ago?

[21029.265646] INFO: task git:16643 blocked for more than 120 seconds.
[21029.267054] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[21029.268412] git           D 000000000072f804     0 16643  16273 0x210001101000080
[21029.269809] Call Trace:
[21029.271062]  [000000000072f778] rwsem_down_failed_common+0x90/0xb8
[21029.272390]  [000000000072f804] __down_read+0x30/0x40
[21029.273689]  [0000000000731148] do_sparc64_fault+0x238/0x788
[21029.274996]  [00000000004079e8] sparc64_realfault_common+0x10/0x20
[21029.276347] INFO: task git:16644 blocked for more than 120 seconds.
[21029.277655] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[21029.278993] git           D 000000000072f874     0 16644  16273 0x210041101000080
[21029.280348] Call Trace:
[21029.281542]  [000000000072f778] rwsem_down_failed_common+0x90/0xb8
[21029.282818]  [000000000072f874] __down_write+0x34/0x44
[21029.284057]  [00000000004d9c44] SyS_mmap_pgoff+0xc8/0x118
[21029.285293]  [0000000000406154] linux_sparc_syscall32+0x34/0x40
 ...

etc.  it's a set of git threads computing deltas for a remote pull
request to the machine.
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