Messages in this thread | | | Subject | Re: [BUG] "sched: Remove rq->lock from the first half of ttwu()" locks up on ARM | From | Marc Zyngier <> | Date | Thu, 26 May 2011 17:22:28 +0100 |
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On Thu, 2011-05-26 at 18:09 +0200, Peter Zijlstra wrote: > On Thu, 2011-05-26 at 17:59 +0200, Peter Zijlstra wrote: > > On Thu, 2011-05-26 at 17:45 +0200, Oleg Nesterov wrote: > > > Stupid question. Can't we fix this problem if we do > > > > > > - if (p == current) > > > + if (cpu == raw_smp_processor_id()) > > > > > > ? > > > > > > I forgot the rules... but iirc task_cpu(p) can't be changed under us? > > > > Easy enough to test.. brain gave out again,. hold on ;-) > > The below seems to run all-right so far, I'll let it run for a while.
Just got the following:
INFO: task kjournald:904 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kjournald D c0284c88 0 904 2 0x00000000 [<c0284c88>] (schedule+0x54c/0x620) from [<c0284dd8>] (io_schedule+0x7c/0xac) [<c0284dd8>] (io_schedule+0x7c/0xac) from [<c00dc1c0>] (sleep_on_buffer+0x8/0x10) [<c00dc1c0>] (sleep_on_buffer+0x8/0x10) from [<c02854ac>] (__wait_on_bit+0x54/0x9c) [<c02854ac>] (__wait_on_bit+0x54/0x9c) from [<c028556c>] (out_of_line_wait_on_bit+0x78/0x84) [<c028556c>] (out_of_line_wait_on_bit+0x78/0x84) from [<c014bc4c>] (journal_commit_transaction+0x734/0x13f4) [<c014bc4c>] (journal_commit_transaction+0x734/0x13f4) from [<c014f598>] (kjournald+0xb8/0x210) [<c014f598>] (kjournald+0xb8/0x210) from [<c0066320>] (kthread+0x80/0x88) [<c0066320>] (kthread+0x80/0x88) from [<c002ea14>] (kernel_thread_exit+0x0/0x8)
M. -- Reality is an implementation detail.
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