From: Dimitris Michailidis <dm@chelsio.com>
To: David Miller <davem@davemloft.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: tasks getting stuck on mmap_sem?
Date: Mon, 16 Aug 2010 22:22:04 -0700 [thread overview]
Message-ID: <4C6A1C7C.7070004@chelsio.com> (raw)
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.
next reply other threads:[~2010-08-17 5:22 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-17 5:22 Dimitris Michailidis [this message]
2010-08-17 5:35 ` tasks getting stuck on mmap_sem? David Miller
2010-08-17 7:23 ` David Miller
-- strict thread matches above, loose matches on Subject: below --
2010-08-17 4:12 David Miller
2010-08-17 16:14 ` Linus Torvalds
2010-08-17 18:24 ` Tony Luck
2010-08-17 20:46 ` Tony Luck
2010-08-17 21:08 ` Linus Torvalds
2010-08-17 21:26 ` Tony Luck
2010-08-17 21:28 ` Linus Torvalds
2010-08-17 21:47 ` Michel Lespinasse
2010-08-17 21:59 ` David Miller
2010-08-17 23:40 ` David Miller
2010-08-17 21:44 ` David Miller
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