Messages in this thread | | | From | "Witold Baryluk" <> | Date | Tue, 31 May 2011 01:46:54 +0200 | Subject | Re: Kernel OOPS in function_graph_tracer due to the 44259b1. More oopses in tracing... |
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On 05-30 16:14, Andrew Lutomirski wrote: > On Mon, May 30, 2011 at 12:10 PM, Witold Baryluk > <baryluk@smp.if.uj.edu.pl> wrote: > > Hi, > > > > I found yesterday a problem when booting system on Pentium-M, 32-bit. > > > > I got approximetly this > > > > [ 2.459170] Testing tracer function_graph: > > [ 2.466979] BUG: unable to handle kernel paging request at e421cc10 > > > > > Reverting commit 44259b1abfaa8bb819d25d41d71e8e33e25dd36a on top of current > > kernel make bug disapear. > > > > Disabling CONFIG_FUNCTION_GRAPH_TRACER also make bug dispear. > > > > Of course, the most trivial of my patches was the one with the most > significant bug. Can you try this fix: > > http://git.kernel.org/?p=linux/kernel/git/x86/linux-2.6-tip.git;a=commitdiff;h=89e1be50c68eb5e58b873dce87bbac627ee18d1f > > --Andy
Well, to add more.
It fixed most of crashes and definietl one with function graph tracer.
However in 1/10 of boots I still got some kind of crash, oops or panic.
I repeated 50 times a boot cycle on qemu, and got oopses in attachments.
... [ 0.036201] CPU: Intel Pentium III (Katmai) stepping 03 [ 0.038551] ftrace: allocating 6263 entries in 13 pages [ 0.050411] BUG: unable to handle kernel NULL pointer dereference at 00000012 [ 0.051079] IP: [<c106a07f>] note_interrupt+0xf/0x1c0 [ 0.051743] *pdpt = 0000000000000000 *pde = f000ff53f000ff53 ... CRASH
.... [ 0.035682] CPU: Intel Pentium III (Katmai) stepping 03 [ 0.038048] ftrace: allocating 6263 entries in 13 pages [ 0.050386] BUG: unable to handle kernel paging request at 8a51553a [ 0.051031] IP: [<c10587cd>] tick_handle_periodic+0x1d/0x90 [ 0.051705] *pdpt = 0000000000000000 *pde = f000ff53f000ff53 ... CRASH
... [ 1.758224] Testing tracer preemptirqsoff: [ 1.772287] ------------[ cut here ]------------ [ 1.773193] WARNING: at kernel/lockdep.c:3351 check_flags+0x186/0x190() ... BOOTING (up to mounting root - not tested more)
... [ 0.045767] CPU: Intel Pentium III (Katmai) stepping 03 [ 0.048323] ftrace: allocating 6263 entries in 13 pages CRASH
Details in attachments.
Regards, Witek
-- Witold Baryluk [unhandled content-type:application/octet-stream][unhandled content-type:application/octet-stream][unhandled content-type:application/octet-stream][unhandled content-type:application/octet-stream][unhandled content-type:application/octet-stream][unhandled content-type:application/octet-stream][unhandled content-type:application/octet-stream][unhandled content-type:application/pgp-signature] | |