linux-kernel - Re: tasks getting stuck on mmap

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Date:	Mon, 16 Aug 2010 22:22:04 -0700
From:	Dimitris Michailidis <dm@...lsio.com>
To:	David Miller <davem@...emloft.net>
CC:	linux-kernel@...r.kernel.org
Subject: Re: tasks getting stuck on mmap_sem?

David Miller wrote:
> 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.

This may be similar to the problems IA-64 had last week as a result of the 
rwsem changes, eg see commit 01d69a82e1d3c938da16bf55aab000672243aa24.  I 
see arch/sparc/include/asm/atomic_64.h uses ints with atomic64_t, which was 
a problem for IA-64.  Just guessing.
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