Messages in this thread |  | | From | Ian Jackson <> | Date | Thu, 26 Oct 2000 18:37:37 +0100 (BST) |
| |
Andrea Arcangeli writes ("Re: linux 2.2.18-pre17: "Kernel panic: LRU list corrupted""): > I also included the fix in a new VM-global patch against vanilla 2.2.18pre17 > (the VM-global patch is available as a single patch inside 2.2.18pre17aa1/ > directory too but I have to maintain a separate version of it against clean > 2.2.18pre17 due silly rejects that I can't avoid) > > ftp://ftp.us.kernel.org/pub/linux/kernel/people/andrea/patches/v2.2/2.2.18pre17/VM-global-2.2.18pre17-7.bz2
I've been having apparently VM-related `pauses' with 2.2.17 [1], so I thought I'd try 2.2.18pre17 with that patch. The results weren't good: I get many instances of
Negative d_count (-805538369) for [binary garbage]/<NULL>
followed by an oops. Kernel logfile extract below, uuencoded.
I'm sure I'd be able to reproduce this, but I'd rather not because this is a production system. ver_linux reports:
chiark:linux-2.2.17-chiark> sh scripts/ver_linux -- Versions installed: (if some fields are empty or looks -- unusual then possibly you have very old versions) Linux chiark 2.2.17 #2 Thu Oct 26 10:57:45 BST 2000 i586 unknown Kernel modules 2.3.11 Gnu C 2.95.2 Binutils 2.9.5.0.37 Linux C Library 2.1.3 Dynamic linker ldd: version 1.9.11 Procps 2.0.6 Mount 2.10f Net-tools 2.05 Kbd 0.99 Sh-utils 2.0 cat: /proc/modules: No such file or directory Modules Loaded chiark:linux-2.2.17-chiark>
I don't know why it says `Kernel modules 2.3.11', since I have disabled kernel modules completely. My CPU is:
processor : 0 vendor_id : AuthenticAMD cpu family : 5 model : 8 model name : AMD-K6(tm) 3D processor stepping : 0 cpu MHz : 350.808 cache size : 64 KB fdiv_bug : no hlt_bug : no sep_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 1 wp : yes flags : fpu vme de pse tsc msr mce cx8 sep mmx 3dnow bogomips : 699.60
REPORTING-BUGS wanted me to include /proc/scsi/scsi, so here it is:
Attached devices: Host: scsi0 Channel: 00 Id: 00 Lun: 00 Vendor: IBM Model: DCAS-34330 Rev: S65A Type: Direct-Access ANSI SCSI revision: 02 Host: scsi0 Channel: 00 Id: 02 Lun: 00 Vendor: IBM Model: DCAS-34330 Rev: S65A Type: Direct-Access ANSI SCSI revision: 02 Host: scsi0 Channel: 00 Id: 04 Lun: 00 Vendor: HP Model: T20 Rev: 3.01 Type: Sequential-Access ANSI SCSI revision: 02 Host: scsi1 Channel: 00 Id: 00 Lun: 00 Vendor: IBM Model: DNES-318350W Rev: SA30 Type: Direct-Access ANSI SCSI revision: 03
It might be relevant that a large part of the system's job is to be a shell account server, and users log in with a variety of mechanisms, most often OpenSSH (Debian 1.2.3-9). I've not had any reports from users about sessions randomly dropping, which I might have expected; however, I did have a number of background cron jobs die in very strange ways suggesting killing of processes at random.
The system as a whole is largely Debian 2.2, and has 256Mb of RAM and about 400Mb of swap. It usually runs with about 50-100Mb of swap used and at a load of somewhere around 1ish during busy periods.
[1] VM lockup problem:
I believe that this is a known problem with the 2.2.x VM ? The symptoms I have are that under reasonably high but not excessive VM and/or disk load, the system will freeze for around 10-15 minutes. Most often this seems to have beeen provoked by a moderately large (20Mb or so) Emacs doing an auto-save during an otherwise-busy time.
During the lockup network packets are processed - pings receive replies, and TCP connection attempts succeed, but there is no evidence of any user-mode executing. After the lockup the system apparently just resumes where it left off. Sometimes afterwards there is a message like `VM: do_try_to_free_pages failed for emacs...' but more often there isn't.
Thanks for your attention,
Ian.
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