Hi Lianbo,
thanks for the patch.
What is the kernel version of this vmcore?
and could I have "bt 0 -c 8 | tail -n 30" output?
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..
> #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>
> Signed-off-by: Lianbo Jiang <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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