[Crash-utility] Re: [PATCH] Fix for "bt" command incorrectly printing "bogus exception frame" warning

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On Tue, Mar 26, 2024 at 2:59 PM HAGIO KAZUHITO(萩尾 一仁) <k-hagio-ab@xxxxxxx> wrote:
On 2024/03/26 15:44, lijiang wrote:
> Thanks for the comment, Kazu.
>
> On Tue, Mar 26, 2024 at 10:28 AM HAGIO KAZUHITO(萩尾 一仁)
> <k-hagio-ab@xxxxxxx <mailto:k-hagio-ab@xxxxxxx>> 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.

I see, thanks.

If it's a RHEL kernel, please let me know the release number e.g.
5.14.0-362.8.1.el9_3.x86_64 ?


Not 8.1, it's the 5.14.0-362.2.1.el9_3.x86_64.

>
>     and could I have "bt 0 -c 8 | tail -n 30" output?
>
> crash> bt 0 -c 8 | tail -n 30

oh my bad, lack of "bt -r" option...
how about "bt 0 -c 8 -r | tail -n 30" ?

 
crash> bt 0 -c 8 -r | tail -n 30
ffffbec3c022fe20:  0000000000000000 0000000000000000
ffffbec3c022fe30:  ffff9948c08f6278 pick_next_task+82
ffffbec3c022fe40:  ffffbec3c022fea0 0000000000000000
ffffbec3c022fe50:  0000000000000000 __switch_to_asm+58
ffffbec3c022fe60:  finish_task_switch+140 0000000000000000
ffffbec3c022fe70:  ffff9948c08f5640 ffff9948e6f03980
ffffbec3c022fe80:  0000000000000000 tick_nohz_next_event+90
ffffbec3c022fe90:  ffff994c2f2a2ae0 0000000000000000
ffffbec3c022fea0:  0000000000000000 0000000000000008
ffffbec3c022feb0:  ct_kernel_enter.constprop.0+64 0000000000000046
ffffbec3c022fec0:  read_tsc         ktime_get+56    
ffffbec3c022fed0:  0000000000000000 __flush_smp_call_function_queue+206
ffffbec3c022fee0:  0000000000000286 ffff9948c08f5640
ffffbec3c022fef0:  0000000000000046 0000000000000286
ffffbec3c022ff00:  flush_smp_call_function_queue+72 0000000000000008
ffffbec3c022ff10:  do_idle+168      0000000040000000
ffffbec3c022ff20:  0000000000000094 cpu_startup_entry+25
ffffbec3c022ff30:  0000000000000000 start_secondary+269
ffffbec3c022ff40:  000000089726a2d0 e48885e126bc1600
ffffbec3c022ff50:  secondary_startup_64_no_verify+229 0000000000000000
ffffbec3c022ff60:  0000000000000000 0000000000000000
ffffbec3c022ff70:  0000000000000000 0000000000000000
ffffbec3c022ff80:  0000000000000000 0000000000000000
ffffbec3c022ff90:  0000000000000000 0000000000000000
ffffbec3c022ffa0:  0000000000000000 0000000000000000
ffffbec3c022ffb0:  0000000000000000 0000000000000000
ffffbec3c022ffc0:  0000000000000000 0000000000000000
ffffbec3c022ffd0:  0000000000000000 0000000000000000
ffffbec3c022ffe0:  0000000000000000 0000000000000000
ffffbec3c022fff0:  0000000000000000 0000000000000000
crash>

 
Thanks,
Kazu

>   #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 <jieli@xxxxxxxxxx <mailto:jieli@xxxxxxxxxx>>
>      > Signed-off-by: Lianbo Jiang <lijiang@xxxxxxxxxx
>     <mailto:lijiang@xxxxxxxxxx>>
>      > ---
>      >   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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