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SubjectRe: 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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