Messages in this thread | | | Date | Fri, 6 Nov 2020 12:06:28 -0600 | From | Josh Poimboeuf <> | Subject | Re: WARNING: can't access registers at asm_common_interrupt |
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On Fri, Nov 06, 2020 at 06:04:15AM +0000, Shinichiro Kawasaki wrote: > Greetings, > > I observe "WARNING: can't access registers at asm_common_interrupt+0x1e/0x40" > in my kernel test system repeatedly, which is printed by unwind_next_frame() in > "arch/x86/kernel/unwind_orc.c". Syzbot already reported that [1]. Similar > warning was reported and discussed [2], but I suppose the cause is not yet > clarified. > > The warning was observed with v5.10-rc2 and older tags. I bisected and found > that the commit 044d0d6de9f5 ("lockdep: Only trace IRQ edges") in v5.9-rc3 > triggered the warning. Reverting that from 5.10-rc2, the warning disappeared. > May I ask comment by expertise on CC how this commit can relate to the warning? > > The test condition to reproduce the warning is rather unique (blktests, > dm-linear and ZNS device emulation by QEMU). If any action is suggested for > further analysis, I'm willing to take it with my test system.
Hi,
Thanks for reporting this issue. This might be a different issue from [2].
Can you send me the arch/x86/entry/entry_64.o file from your build?
-- Josh
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