Re: [Crash-utility] [PATCH] Fix for "bt" command incorrectly printing eframe stack with a bogus warning
On 2023/02/15 17:24, Lianbo Jiang wrote:
Kernel commit 7d65f4a65532 ("irq: Consolidate do_softirq() arch
overriden
implementations") renamed the call_softirq to do_softirq_own_stack.
Crash may incorrectly output the eframe stack with a warning as below:
crash> foreach bt
...
PID: 0 TASK: ffff914f820a8000 CPU: 25 COMMAND: "swapper/25"
#0 [fffffe0000504e48] crash_nmi_callback at ffffffffa665d763
#1 [fffffe0000504e50] nmi_handle at ffffffffa662a423
#2 [fffffe0000504ea8] default_do_nmi at ffffffffa6fe7dc9
#3 [fffffe0000504ec8] do_nmi at ffffffffa662a97f
#4 [fffffe0000504ef0] end_repeat_nmi at ffffffffa70015e8
[exception RIP: clone_endio+172]
RIP: ffffffffc005c1ec RSP: ffffa1d403d08e98 RFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff915326fba230 RCX: 0000000000000018
RDX: ffffffffc0075400 RSI: 0000000000000000 RDI: ffff915326fba230
RBP: ffff915326fba1c0 R8: 0000000000001000 R9: ffff915308d6d2a0
R10: 000000a97dfe5e10 R11: ffffa1d40038fe98 R12: ffff915302babc40
R13: ffff914f94360000 R14: 0000000000000000 R15: 0000000000000000
ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
--- <NMI exception stack> ---
#5 [ffffa1d403d08e98] clone_endio at ffffffffc005c1ec [dm_mod]
#6 [ffffa1d403d08ed0] blk_update_request at ffffffffa6a96954
#7 [ffffa1d403d08f10] scsi_end_request at ffffffffa6c9b968
#8 [ffffa1d403d08f48] scsi_io_completion at ffffffffa6c9bb3e
#9 [ffffa1d403d08f90] blk_complete_reqs at ffffffffa6aa0e95
#10 [ffffa1d403d08fa0] __softirqentry_text_start at ffffffffa72000dc
#11 [ffffa1d403d08ff0] do_softirq_own_stack at ffffffffa7000f9a
--- <IRQ stack> ---
#12 [ffffa1d40038fe70] do_softirq_own_stack at ffffffffa7000f9a
[exception RIP: unknown or invalid address]
RIP: 0000000000000000 RSP: 0000000000000000 RFLAGS: 00000000
RAX: ffffffffa672eae5 RBX: ffffffffa83b34e0 RCX: ffffffffa672eb12
RDX: 0000000000000010 RSI: 8b7d6c8869010c00 RDI: 0000000000000085
RBP: 0000000000000286 R8: ffff914f820a8000 R9: ffffffffa67a94e0
R10: 0000000000000286 R11: ffffffffa66fb4c5 R12: ffffffffa67a898b
R13: 0000000000000000 R14: fffffffffffffff8 R15: ffffffffa67a1e68
ORIG_RAX: 0000000000000000 CS: 0000 SS: ffffffffa672edff
bt: WARNING: possibly bogus exception frame
#13 [ffffa1d40038ff30] start_secondary at ffffffffa665fa2c
#14 [ffffa1d40038ff50] secondary_startup_64_no_verify at ffffffffa6600116
...
Thank you for the patch. Could I have "bt -c 25" output with the patch
and "bt -r -c 25 | tail -n 40" output for checking?
Thanks,
Kazu
>
> Also no exception frame when coming from do_softirq_own_stack.
>
> Reported-by: Marco Patalano <mpatalan(a)redhat.com>
> Signed-off-by: Lianbo Jiang <lijiang(a)redhat.com>
> ---
> x86_64.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/x86_64.c b/x86_64.c
> index 5b671bd97775..3428bed417df 100644
> --- a/x86_64.c
> +++ b/x86_64.c
> @@ -3825,10 +3825,11 @@ in_exception_stack:
> up -= 1;
> bt->instptr = *up;
> /*
> - * No exception frame when coming from call_softirq.
> + * No exception frame when coming from call_softirq
> + * or do_softirq_own_stack.
> */
> if ((sp = value_search(bt->instptr, &offset)) &&
> - STREQ(sp->name, "call_softirq"))
> + (STREQ(sp->name, "call_softirq") || STREQ(sp->name,
"do_softirq_own_stack")))
> irq_eframe = 0;
> bt->frameptr = 0;
> done = FALSE;