2.6.15-rc1 Badness in handle_page_fault

uml-devel Antoine Martin 3 participants 5 messages Jan 16, 2006 – Jan 17, 2006 User-mode Linux (UML)

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Antoine Martin

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2006-01-16 20:50 UTC #0 lore raw

Found these in a guest running 2.6.15-rc1.
Note sure this is relevant anymore, but here it is anyway:

[45512066.140000] Badness in handle_page_fault at
arch/um/kernel/trap_kern.c:101
[45512066.140000] a52ebb90:  [<a0022b4e>] handle_page_fault+0x2ae/0x2c0
[45512066.140000] a52ebbbc:  [<a0022e59>] segv+0x1b9/0x320
[45512066.140000] a52ebbdc:  [<a0058de1>] activate_task+0x71/0x90
[45512066.140000] a52ebc04:  [<a004e76d>] wait_stub_done+0x5d/0x170
[45512066.140000] a52ebc24:  [<a00a44c2>] filp_close+0x52/0x90
[45512066.140000] a52ebc3c:  [<a00a4573>] sys_close+0x73/0x80
[45512066.140000] a52ebc54:  [<a002732e>] handle_syscall+0x12e/0x1c0
[45512066.140000] a52ebc6c:  [<a0022c1f>] segv_handler+0xbf/0x140
[45512066.140000] a52ebc94:  [<a004f961>] user_signal+0x51/0x80
[45512066.140000] a52ebca8:  [<a004f636>] userspace+0x1e6/0x3a0
[45512066.140000] a52ebd08:  [<a0026f12>] fork_handler+0xd2/0x100
[45512066.140000] a52ebd5c:  [<a0462f81>] kill+0x11/0x20
[45512066.140000]
[45512066.830000] load_TLS(O_FORCE) in fork_handler returned -2
[45512067.820000] Badness in handle_page_fault at
arch/um/kernel/trap_kern.c:101
[45512067.820000] a52ebb90:  [<a0022b4e>] handle_page_fault+0x2ae/0x2c0
[45512067.820000] a52ebbbc:  [<a0022e59>] segv+0x1b9/0x320
[45512067.820000] a52ebbe8:  [<a00c4a32>] mntput_no_expire+0x22/0x90
[45512067.820000] a52ebc04:  [<a004e76d>] wait_stub_done+0x5d/0x170
[45512067.820000] a52ebc24:  [<a00a44c2>] filp_close+0x52/0x90
[45512067.820000] a52ebc3c:  [<a00a4573>] sys_close+0x73/0x80
[45512067.820000] a52ebc54:  [<a002732e>] handle_syscall+0x12e/0x1c0
[45512067.820000] a52ebc6c:  [<a0022c1f>] segv_handler+0xbf/0x140
[45512067.820000] a52ebc94:  [<a004f961>] user_signal+0x51/0x80
[45512067.820000] a52ebca8:  [<a004f636>] userspace+0x1e6/0x3a0
[45512067.820000] a52ebd08:  [<a0026f12>] fork_handler+0xd2/0x100
[45512067.820000] a52ebd5c:  [<a0462f81>] kill+0x11/0x20
[45512067.820000]
[45512068.490000] load_TLS(O_FORCE) in fork_handler returned -2
[45512070.120000] load_TLS(O_FORCE) in fork_handler returned -2
[45512070.890000] load_TLS(O_FORCE) in fork_handler returned -2
[45512070.890000] load_TLS(O_FORCE) in fork_handler returned -2
[45512073.140000] load_TLS(O_FORCE) in fork_handler returned -2
[45512073.140000] load_TLS(O_FORCE) in fork_handler returned -2
[45512074.110000] load_TLS(O_FORCE) in fork_handler returned -2
[45512075.100000] load_TLS(O_FORCE) in fork_handler returned -2
[45512075.890000] load_TLS(O_FORCE) in fork_handler returned -2
[45512080.480000] load_TLS(O_FORCE) in fork_handler returned -2
[45512080.480000] load_TLS(O_FORCE) in fork_handler returned -2
[45512082.000000] load_TLS(O_FORCE) in fork_handler returned -2
[45512082.230000] load_TLS(O_FORCE) in fork_handler returned -2
[45512091.260000] load_TLS(O_FORCE) in fork_handler returned -2
[45512097.510000] load_TLS(O_FORCE) in fork_handler returned -2
[45512097.590000] load_TLS(O_FORCE) in fork_handler returned -2
[45512097.590000] load_TLS(O_FORCE) in fork_handler returned -2
[45512103.120000] load_TLS(O_FORCE) in fork_handler returned -2
[45512104.320000] load_TLS(O_FORCE) in fork_handler returned -2
[45512109.940000] load_TLS(O_FORCE) in fork_handler returned -2
[45512109.940000] load_TLS(O_FORCE) in fork_handler returned -2
[45512109.940000] load_TLS(O_FORCE) in fork_handler returned -2
[45512113.300000] uml_net_start_xmit: failed(-1)
[45512116.580000] load_TLS(O_FORCE) in fork_handler returned -2

Antoine

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Jeff Dike

2006-01-16 23:02 UTC #1 lore raw

Quoted 7 lines · Antoine Martin

Found these in a guest running 2.6.15-rc1.
Note sure this is relevant anymore, but here it is anyway:
[45512066.140000] Badness in handle_page_fault at
arch/um/kernel/trap_kern.c:101
[45512066.830000] load_TLS(O_FORCE) in fork_handler returned -2

These are fixed.

Jeff

Blaisorblade

2006-01-17 01:34 UTC #2 lore raw

Quoted 10 lines · Jeff Dike

Quoted 7 lines · Antoine Martin
Found these in a guest running 2.6.15-rc1.
Note sure this is relevant anymore, but here it is anyway:
[45512066.140000] Badness in handle_page_fault at
arch/um/kernel/trap_kern.c:101
[45512066.830000] load_TLS(O_FORCE) in fork_handler returned -2
These are fixed.

I remember the badness in handle_page_fault (bogus warning from me), what about load_TLS? I only got -22, I fixed it by removing tls-debug (it was a kludgy attempt to get things working, and didn't appear correct to me); still not completely tested.

See my "TLS patches compilation fixups" for the fixes.

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Jeff Dike

2006-01-17 02:45 UTC #3 lore raw

Quoted 2 lines · Blaisorblade

what
about load_TLS? I only got -22, I fixed it by removing tls-debug

That's caused by referring to errno in kernel code. That gets you the value of kernel_errno, which could be anything.

Jeff

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Blaisorblade

2006-01-17 14:11 UTC #4 lore raw

Quoted 6 lines · Jeff Dike

Quoted 2 lines · Blaisorblade
what
about load_TLS? I only got -22, I fixed it by removing tls-debug
That's caused by referring to errno in kernel code. That gets you the value of kernel_errno, which could be anything.

Ok, in fact -2 (-ENOENT) didn't make sense, while -22 (-EINVAL) makes a lot. You agree to removing the -debug part? Can you retest without that? I've done a patch which complains if it ever returns something different from -EINVAL (it's in my uploaded patchset, the last one, URL posted in my email).

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Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
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