Hi All.
I have been using user mode linux since 2004, but I have decided to
update my images to fedora 15.
However I cannot get a stable uml kernel to run this image.
For instance 2.6.39.1 crashes when I try "yum update". The errors on
the console are shown at the end of this email.
I get the same crash at the same place with 2.6.38.8. Its completely
repeatable. I tried the guest with and without swap (512mb ram).
I tried 2.6.35.4 (patched for gcc 4.6), which does not crash but
suffers from repeated "stalled cpu" problems, solved each time by
hitting a key on one of the consoles. The stalls are so bad that I
cannot shutdown the image...
I am compiling on a 32 bit Fedora 15 PC, so gcc is 4.6.0. (I am
assuming uml still must be 32 bit)
I am running the uml image on a 64 bit Fedora 14 machine.
The only unusual things in my compile that I need is static linking,
no modules, and SELinux is on.
2.6.35.4 is very stable on my old image, but this does not use SELinux
(its fedora 2 but this is getting very old).
I am a keen user of uml, and other than the one crash and the one hang
it works fine.
But I am fast approaching the point of just using qemu/kvm. but this
uses up more resources, and I run up to 100 vms (but not all on the
same machine!).
All suggestions appreciated, except I must use a 64 bit host,
preferably have no module support, and run SELinux,
Thanks
Gordon.
---
2.6.39.1 crash message:
EIP: 0023:[<080cbb76>] CPU: 0 Not tainted ESP: 002b:180b9d9c EFLAGS: 00010206
Not tainted
EAX: 1654b000 EBX: 0af4dcc0 ECX: 00000400 EDX: 00000000
ESI: 08e2e000 EDI: 1654b000 EBP: 0b0fc060 DS: 002b ES: 002b
085d1964: [<080649bb>] reactivate_fd+0x55/0x5b
085d197c: [<0806ee57>] ubd_intr+0x84/0xd7
085d199c: [<080b6baf>] handle_IRQ_event+0x9e/0xab
085d19c0: [<083b63dc>] __libc_poll+0x2c/0xb0
085d19e0: [<08067833>] segv_handler+0x4d/0x53
085d19f0: [<080cbb76>] do_wp_page+0x44f/0x602
085d1a04: [<080753bf>] sig_handler_common+0x6a/0x74
085d1a40: [<080cbb76>] do_wp_page+0x44f/0x602
085d1a78: [<08075494>] sig_handler+0x30/0x3c
085d1a80: [<0807511b>] handle_signal+0x5e/0x91
085d1aa0: [<08076ff7>] hard_handler+0x17/0x1c
085d1aec: [<080cbb76>] do_wp_page+0x44f/0x602
Kernel panic - not syncing: Kernel mode fault at addr 0x8e2e000, ip 0x80cbb76
085d190c: [<083fdc5d>] panic+0x63/0x14f
085d1928: [<080cbb76>] do_wp_page+0x44f/0x602
085d1930: [<080677e6>] segv_handler+0x0/0x53
085d193c: [<080cbb76>] do_wp_page+0x44f/0x602
085d1964: [<080649bb>] reactivate_fd+0x55/0x5b
085d197c: [<0806ee57>] ubd_intr+0x84/0xd7
085d199c: [<080b6baf>] handle_IRQ_event+0x9e/0xab
085d19c0: [<083b63dc>] __libc_poll+0x2c/0xb0
085d19e0: [<08067833>] segv_handler+0x4d/0x53
085d19f0: [<080cbb76>] do_wp_page+0x44f/0x602
085d1a04: [<080753bf>] sig_handler_common+0x6a/0x74
085d1a40: [<080cbb76>] do_wp_page+0x44f/0x602
085d1a78: [<08075494>] sig_handler+0x30/0x3c
085d1a80: [<0807511b>] handle_signal+0x5e/0x91
085d1aa0: [<08076ff7>] hard_handler+0x17/0x1c
085d1aec: [<080cbb76>] do_wp_page+0x44f/0x602
EIP: 0023:[<400859cf>] CPU: 0 Not tainted ESP: 002b:7ffb2ed0 EFLAGS: 00210283
Not tainted
EAX: 080570b0 EBX: 4018f6cc ECX: 00000000 EDX: 08165e84
ESI: 00000001 EDI: 0b5154d4 EBP: 40a2f640 DS: 002b ES: 002b
085d18e8: [<0809c4ef>] notifier_call_chain+0x2d/0x4d
085d1904: [<080cbb76>] do_wp_page+0x44f/0x602
085d190c: [<083fdc85>] panic+0x8b/0x14f
085d1928: [<080cbb76>] do_wp_page+0x44f/0x602
085d1930: [<080677e6>] segv_handler+0x0/0x53
085d193c: [<080cbb76>] do_wp_page+0x44f/0x602
085d1964: [<080649bb>] reactivate_fd+0x55/0x5b
085d197c: [<0806ee57>] ubd_intr+0x84/0xd7
085d199c: [<080b6baf>] handle_IRQ_event+0x9e/0xab
085d19c0: [<083b63dc>] __libc_poll+0x2c/0xb0
085d19e0: [<08067833>] segv_handler+0x4d/0x53
085d19f0: [<080cbb76>] do_wp_page+0x44f/0x602
085d1a04: [<080753bf>] sig_handler_common+0x6a/0x74
085d1a40: [<080cbb76>] do_wp_page+0x44f/0x602
085d1a78: [<08075494>] sig_handler+0x30/0x3c
085d1a80: [<0807511b>] handle_signal+0x5e/0x91
085d1aa0: [<08076ff7>] hard_handler+0x17/0x1c
085d1aec: [<080cbb76>] do_wp_page+0x44f/0x602
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