2:59 a.m.
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(a)redhat.com>
Signed-off-by: Lianbo Jiang <lijiang(a)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;
--
2.41.0