Messages in this thread | | | Date | Tue, 23 Nov 2004 11:53:31 -0700 (MST) | From | Zwane Mwaikambo <> | Subject | RE: smp_call_function/flush_tlb_all hang on large memory system |
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On Tue, 23 Nov 2004, Deepak Kumar Gupta, Noida wrote:
> Hi Robin > > The output of CPU is > > CPU A: 0x02: Kernel: CPU busy > 0x03: Kernel: CPU busy > CPU C: 0x03: Kernel: CPU busy > > well regarding filing the issue.. i haven't yet contactated support > persons.. send the mail to just know whether there is already a solution > available or not.. > > If you are interested in stack trace.. then it is as follows:- > > [0]kdb> bt > Stack traceback for pid 7 > 0xe00000307b818000 7 1 1 0 R 0xe00000307b8185a0 *kswapd > 0xe00000000444b120 smp_call_function+0x5e0 > args (0xe000000005033698, 0xe000000005033698, 0x1, > 0xa000000000008000, 0x1) > kernel .text 0xe000000004400000 0xe00000000444ab40 > 0xe00000000444b160 > 0xe00000000444a330 smp_flush_tlb_all+0x30 > args (0xe0000000044545a0, 0x288) > kernel .text 0xe000000004400000 0xe00000000444a300 > 0xe00000000444a360 > 0xe0000000044545a0 flush_tlb_range+0x40 > args (0xe00000307a5b64c8, 0x2000000002128000, 0x200000000212c000, > 0xe000000004559880, 0x58e) > kernel .text 0xe000000004400000 0xe000000004454560 > 0xe000000004454700 > 0xe000000004559880 try_to_swap_out+0x320 > args (0xe00000307a5b64c8, 0xe00000303b910468, 0x27be00, > 0xe000003045638250, 0xa0007fffffe20300) > kernel .text 0xe000000004400000 0xe000000004559560
This function holds mm->page_table_lock which is acquired with interrupts disabled. As a result there is a window for deadlock when you descend into smp_call_function. I suggest you run fast from crusty kernels ;)
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