Thanks for the comment, Kazu.

On Tue, Mar 26, 2024 at 10:28 AM HAGIO KAZUHITO(萩尾 一仁) <k-hagio...@nec.com>
wrote:

> Hi Lianbo,
>
> thanks for the patch.
>
> What is the kernel version of this vmcore?
>

The kernel version is 5.14.0,  but I did not reproduce it, it seems it's
not easy to reproduce.


> and could I have "bt 0 -c 8 | tail -n 30" output?
>
>
crash> bt 0 -c 8 | tail -n 30
 #4 [fffffe1788788ef0] end_repeat_nmi at ffffffff980015f9
    [exception RIP: __update_load_avg_se+13]
    RIP: ffffffff9736b16d  RSP: ffffbec3c08acc78  RFLAGS: 00000046
    RAX: 0000000000000000  RBX: ffff994c2f2b1a40  RCX: ffffbec3c08acdc0
    RDX: ffff9948e4fe1d80  RSI: ffff994c2f2b1a40  RDI: 0000001d7ad7d55d
    RBP: ffffbec3c08acc88   R8: 0000001d921fca6f   R9: ffff994c2f2b1328
    R10: 00000000fffd0010  R11: ffffffff98e060c0  R12: 0000001d7ad7d55d
    R13: 0000000000000005  R14: ffff994c2f2b19c0  R15: 0000000000000001
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
--- <NMI exception stack> ---
 #5 [ffffbec3c08acc78] __update_load_avg_se at ffffffff9736b16d
 #6 [ffffbec3c08acce0] enqueue_entity at ffffffff9735c9ab
 #7 [ffffbec3c08acd28] enqueue_task_fair at ffffffff9735cef8
 #8 [ffffbec3c08acd60] enqueue_task at ffffffff973481fa
 #9 [ffffbec3c08acd88] ttwu_do_activate at ffffffff9734aeed
#10 [ffffbec3c08acdb0] try_to_wake_up at ffffffff9734c7d7
#11 [ffffbec3c08ace08] __queue_work at ffffffff9732a4d2
#12 [ffffbec3c08ace50] queue_work_on at ffffffff9732a6a4
#13 [ffffbec3c08ace60] iomap_dio_bio_end_io at ffffffff976a7b4c
#14 [ffffbec3c08ace90] clone_endio at ffffffffc090315f [dm_mod]
#15 [ffffbec3c08aced0] blk_update_request at ffffffff9779b49d
#16 [ffffbec3c08acf28] scsi_end_request at ffffffff97a3d5a7
#17 [ffffbec3c08acf58] scsi_io_completion at ffffffff97a3e606
#18 [ffffbec3c08acf90] blk_complete_reqs at ffffffff977978d0
#19 [ffffbec3c08acfa0] __do_softirq at ffffffff97e66f7a
#20 [ffffbec3c08acff0] do_softirq at ffffffff9730f6ef
--- <IRQ stack> ---
#21 [ffffbec3c022ff28] cpu_startup_entry at ffffffff973684a9
#22 [ffffbec3c022ff38] start_secondary at ffffffff9726a3dd
#23 [ffffbec3c022ff50] secondary_startup_64_no_verify at ffffffff9720015a
crash>


> If it's RHEL9, probably that do_softirq is called with this path.
>
> cpu_startup_entry
>    do_idle
>      flush_smp_call_function_queue
>        do_softirq
>
> but do_idle is skipped as below, I'd like to check just in case..
>
>
Good question. I noticed the call trace, but this may be another issue.

Thanks
Lianbo

 >    #20 [ffffbec3c08acff0] do_softirq at ffffffff9730f6ef
>  >    --- <IRQ stack> ---
>  >    #21 [ffffbec3c022ff28] cpu_startup_entry at ffffffff973684a9
>
> Thanks,
> Kazu
>
>
> On 2024/03/19 16:59, Lianbo Jiang wrote:
> > The "bogus exception frame" warning was observed again on a specific
> > vmcore, and the remaining frame was truncated on X86_64 machine, when
> > executing the "bt" command as below:
> >
> >    crash> bt 0 -c 8
> >    PID: 0        TASK: ffff9948c08f5640  CPU: 8    COMMAND: "swapper/8"
> >     #0 [fffffe1788788e58] crash_nmi_callback at ffffffff972672bb
> >     #1 [fffffe1788788e68] nmi_handle at ffffffff9722eb8e
> >     #2 [fffffe1788788eb0] default_do_nmi at ffffffff97e51cd0
> >     #3 [fffffe1788788ed0] exc_nmi at ffffffff97e51ee1
> >     #4 [fffffe1788788ef0] end_repeat_nmi at ffffffff980015f9
> >        [exception RIP: __update_load_avg_se+13]
> >        RIP: ffffffff9736b16d  RSP: ffffbec3c08acc78  RFLAGS: 00000046
> >        RAX: 0000000000000000  RBX: ffff994c2f2b1a40  RCX:
> ffffbec3c08acdc0
> >        RDX: ffff9948e4fe1d80  RSI: ffff994c2f2b1a40  RDI:
> 0000001d7ad7d55d
> >        RBP: ffffbec3c08acc88   R8: 0000001d921fca6f   R9:
> ffff994c2f2b1328
> >        R10: 00000000fffd0010  R11: ffffffff98e060c0  R12:
> 0000001d7ad7d55d
> >        R13: 0000000000000005  R14: ffff994c2f2b19c0  R15:
> 0000000000000001
> >        ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
> >    --- <NMI exception stack> ---
> >     #5 [ffffbec3c08acc78] __update_load_avg_se at ffffffff9736b16d
> >     #6 [ffffbec3c08acce0] enqueue_entity at ffffffff9735c9ab
> >     #7 [ffffbec3c08acd28] enqueue_task_fair at ffffffff9735cef8
> >     #8 [ffffbec3c08acd60] enqueue_task at ffffffff973481fa
> >     #9 [ffffbec3c08acd88] ttwu_do_activate at ffffffff9734aeed
> >    #10 [ffffbec3c08acdb0] try_to_wake_up at ffffffff9734c7d7
> >    #11 [ffffbec3c08ace08] __queue_work at ffffffff9732a4d2
> >    #12 [ffffbec3c08ace50] queue_work_on at ffffffff9732a6a4
> >    #13 [ffffbec3c08ace60] iomap_dio_bio_end_io at ffffffff976a7b4c
> >    #14 [ffffbec3c08ace90] clone_endio at ffffffffc090315f [dm_mod]
> >    #15 [ffffbec3c08aced0] blk_update_request at ffffffff9779b49d
> >    #16 [ffffbec3c08acf28] scsi_end_request at ffffffff97a3d5a7
> >    #17 [ffffbec3c08acf58] scsi_io_completion at ffffffff97a3e606
> >    #18 [ffffbec3c08acf90] blk_complete_reqs at ffffffff977978d0
> >    #19 [ffffbec3c08acfa0] __do_softirq at ffffffff97e66f7a
> >    #20 [ffffbec3c08acff0] do_softirq at ffffffff9730f6ef
> >    --- <IRQ stack> ---
> >    #21 [ffffbec3c022ff18] do_idle at ffffffff97368288
> >        [exception RIP: unknown or invalid address]
> >        RIP: 0000000000000000  RSP: 0000000000000000  RFLAGS: 00000000
> >        RAX: 0000000000000000  RBX: 000000089726a2d0  RCX:
> 0000000000000000
> >        RDX: 0000000000000000  RSI: 0000000000000000  RDI:
> 0000000000000000
> >        RBP: ffffffff9726a3dd   R8: 0000000000000000   R9:
> 0000000000000000
> >        R10: ffffffff9720015a  R11: e48885e126bc1600  R12:
> 0000000000000000
> >        R13: ffffffff973684a9  R14: 0000000000000094  R15:
> 0000000040000000
> >        ORIG_RAX: 0000000000000000  CS: 0000  SS: 0000
> >    bt: WARNING: possibly bogus exception frame
> >    crash>
> >
> > Actually there is no exception frame, when called from do_softirq().
> > With the patch:
> >
> >    crash> bt 0 -c 8
> >    PID: 0        TASK: ffff9948c08f5640  CPU: 8    COMMAND: "swapper/8"
> >     #0 [fffffe1788788e58] crash_nmi_callback at ffffffff972672bb
> >     #1 [fffffe1788788e68] nmi_handle at ffffffff9722eb8e
> >     #2 [fffffe1788788eb0] default_do_nmi at ffffffff97e51cd0
> >     #3 [fffffe1788788ed0] exc_nmi at ffffffff97e51ee1
> >     #4 [fffffe1788788ef0] end_repeat_nmi at ffffffff980015f9
> >        [exception RIP: __update_load_avg_se+13]
> >        RIP: ffffffff9736b16d  RSP: ffffbec3c08acc78  RFLAGS: 00000046
> >        RAX: 0000000000000000  RBX: ffff994c2f2b1a40  RCX:
> ffffbec3c08acdc0
> >        RDX: ffff9948e4fe1d80  RSI: ffff994c2f2b1a40  RDI:
> 0000001d7ad7d55d
> >        RBP: ffffbec3c08acc88   R8: 0000001d921fca6f   R9:
> ffff994c2f2b1328
> >        R10: 00000000fffd0010  R11: ffffffff98e060c0  R12:
> 0000001d7ad7d55d
> >        R13: 0000000000000005  R14: ffff994c2f2b19c0  R15:
> 0000000000000001
> >        ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
> >    --- <NMI exception stack> ---
> >     #5 [ffffbec3c08acc78] __update_load_avg_se at ffffffff9736b16d
> >     #6 [ffffbec3c08acce0] enqueue_entity at ffffffff9735c9ab
> >     #7 [ffffbec3c08acd28] enqueue_task_fair at ffffffff9735cef8
> >     #8 [ffffbec3c08acd60] enqueue_task at ffffffff973481fa
> >     #9 [ffffbec3c08acd88] ttwu_do_activate at ffffffff9734aeed
> >    #10 [ffffbec3c08acdb0] try_to_wake_up at ffffffff9734c7d7
> >    #11 [ffffbec3c08ace08] __queue_work at ffffffff9732a4d2
> >    #12 [ffffbec3c08ace50] queue_work_on at ffffffff9732a6a4
> >    #13 [ffffbec3c08ace60] iomap_dio_bio_end_io at ffffffff976a7b4c
> >    #14 [ffffbec3c08ace90] clone_endio at ffffffffc090315f [dm_mod]
> >    #15 [ffffbec3c08aced0] blk_update_request at ffffffff9779b49d
> >    #16 [ffffbec3c08acf28] scsi_end_request at ffffffff97a3d5a7
> >    #17 [ffffbec3c08acf58] scsi_io_completion at ffffffff97a3e606
> >    #18 [ffffbec3c08acf90] blk_complete_reqs at ffffffff977978d0
> >    #19 [ffffbec3c08acfa0] __do_softirq at ffffffff97e66f7a
> >    #20 [ffffbec3c08acff0] do_softirq at ffffffff9730f6ef
> >    --- <IRQ stack> ---
> >    #21 [ffffbec3c022ff28] cpu_startup_entry at ffffffff973684a9
> >    #22 [ffffbec3c022ff38] start_secondary at ffffffff9726a3dd
> >    #23 [ffffbec3c022ff50] secondary_startup_64_no_verify at
> ffffffff9720015a
> >    crash>
> >
> > Reported-by: Jie Li <ji...@redhat.com>
> > Signed-off-by: Lianbo Jiang <liji...@redhat.com>
> > ---
> >   x86_64.c | 7 ++++---
> >   1 file changed, 4 insertions(+), 3 deletions(-)
> >
> > diff --git a/x86_64.c b/x86_64.c
> > index 502817d3b2bd..c672a0c3e8fc 100644
> > --- a/x86_64.c
> > +++ b/x86_64.c
> > @@ -3841,11 +3841,12 @@ in_exception_stack:
> >               up -= 1;
> >                   bt->instptr = *up;
> >               /*
> > -              *  No exception frame when coming from
> do_softirq_own_stack
> > -              *  or call_softirq.
> > +              *  No exception frame when coming from
> do_softirq_own_stack,
> > +              *  call_softirq or do_softirq.
> >                */
> >               if ((sp = value_search(bt->instptr, &offset)) &&
> > -                 (STREQ(sp->name, "do_softirq_own_stack") ||
> STREQ(sp->name, "call_softirq")))
> > +                 (STREQ(sp->name, "do_softirq_own_stack") ||
> STREQ(sp->name, "call_softirq")
> > +                  || STREQ(sp->name, "do_softirq")))
> >                       irq_eframe = 0;
> >                   bt->frameptr = 0;
> >                   done = FALSE;
--
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