Messages in this thread | | | Date | Mon, 16 Aug 2010 22:22:04 -0700 | From | Dimitris Michailidis <> | Subject | Re: tasks getting stuck on mmap_sem? |
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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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