Messages in this thread | | | From | Shinichiro Kawasaki <> | Subject | WARNING: can't access registers at asm_common_interrupt | Date | Fri, 6 Nov 2020 06:04:15 +0000 |
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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.
Wish this report helps.
[1] https://lkml.org/lkml/2020/9/6/231 [2] https://lkml.org/lkml/2020/9/8/1538
-- Best Regards, Shin'ichiro Kawasaki
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