Messages in this thread | | | From | Shinichiro Kawasaki <> | Subject | Re: WARNING: can't access registers at asm_common_interrupt | Date | Mon, 9 Nov 2020 09:10:38 +0000 |
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On Nov 06, 2020 / 12:06, Josh Poimboeuf wrote: > 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?
Hi Josh, thank you for your response. As a separated e-mail, I have sent the entry_64.o only to your address, since I hesitate to send around the 76kb attachment file to LKML. In case it does not reach to you, please let me know.
-- Best Regards, Shin'ichiro Kawasaki
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