Messages in this thread | | | Date | 22 Nov 2012 12:58:24 -0500 | From | "George Spelvin" <> | Subject | 3.7-rc6 soft lockup in kswapd0 |
| |
I'm having an interesting issue with a uniprocessor Pentium 4 machine locking up overnight. 3.6.5 didn't do that, but 3.7-rc6 is not doing so well.
It's kind of a funny lockup. Some things work:
- TCP SYN handshake - Alt-SysRq
And others don't:
- Caps lock - Shift-PgUp - Alt-Fn - Screen unblanking - Actually talking to a daemon
This is a "headless" machine that boots to a text console and has zero console activity until the lockup.
This has happened overnight, three nights in a row. I had to turn screen blanking off to see anything on the screen. Running the daily cron jobs manually just now didn't trigger it, so I haven't found a proximate cause.
The *first* error has scrolled off the screen, but what I can see an infinite stream (at about 20s intervals) of:
BUG: soft lockup - CPU#0 stuck for 22s! [kswapd0:317] Pid: 317, comm: kswapd0 Not tainted 3.7.0-RC6 #224 HP Pavilion 04 P6319A-ABA 750N/P4B266LA EIP: 0060:[<c10571f7>] EFLAGS: 00000202 CPU: 0 EIP is at __zone_watermark_ok+0x5f/7e, 0x67/7e, 0x6e/0x7e, or 0x74/7e (Didn't type registers & stack) Call Trace: [<c105774f>] ? zone_watermark_ok_safe+0x34/0x3a [<c105ec7e>] ? kswapd+0x2fa/0x6f6 [<c105e984>] ? try_to_free_pages+0x4b8/0x4b8 [<c103106b>] ? kthread+0x67/0x6c [<c12559b7>] ? ret_from_kernel_thread+0x1b/0x28 [<c1031004>] ? -_kthread_parkme+0x4c.0x4c Code: (didn't type in first line) 5f 67 6e 74 7e c9 39 d6 7f 14 eb 1c 6b c1 2c <8b> 44 05 60 d3 e0 29 c6 <d1> fb 39 de 7e 09 41 <39> f9 7c ea b0 01 <eb> 02 31 c0 5a 5b 5e 5f 5d c3 01 14 85 7c 16
The lack of scrollback limits me to 49 lines of SysRq output, and usually the most interesting part disappears off the screen. Two things I can see:
- SysRq-W shows no blocked tasks - SysRq-M shows zero swap in use, and apparently adequate free memory DMA: <various segments> = 9048kB Normal: <various> = 116312kB HighMem: <various> = 41660kB 416557 total pagecache pages 0 pages in swap cache Swap cache stats: add 0, delete 0, find 0/0 Free swap = 4883724kB Total swap = 4883724kB 524260 pages RAM 296958 pages HighMem 5221 pages reserved 406417 pages shared 351419 pages non-shared
Does anyone have any debugging suggestions? Waiting overnight to make a good/bad decision makes bisecting pretty slow...
| |