Hi Lianbo,
sorry for the delay..
On 2023/11/29 21:37, lijiang wrote:
> On Wed, Nov 29, 2023 at 8:45 AM HAGIO KAZUHITO(萩尾 一仁) <k-hagio-ab@xxxxxxx>
> wrote:
>
>> On 2023/11/28 11:31, Lianbo Jiang wrote:
>>> Currently, the "bt pid" command may not print enough stack trace and the
>>> remaining frames will be truncated on x86_64. For example:
>>>
>>> Without the patch:
>>> crash> bt 493113
>>> PID: 493113 TASK: ff2e34ecbd3ca2c0 CPU: 27 COMMAND:
>> "sriov_fec_daemo"
>>> #0 [ff77abc4e81cfb08] __schedule at ffffffff81b239cb
>>> #1 [ff77abc4e81cfb70] schedule at ffffffff81b23e2d
>>> #2 [ff77abc4e81cfb88] schedule_timeout at ffffffff81b2c9e8
>>> RIP: 000000000047cdbb RSP: 000000c0000975a8 RFLAGS: 00000216
>>> RAX: ffffffffffffffda RBX: 000000c00004e000 RCX:
>> 000000000047cdbb
>>> RDX: 000000000000000c RSI: 000000c000097798 RDI:
>> 0000000000000009
>>> RBP: 000000c0000975f8 R8: 0000000000000001 R9:
>> 000000c00098d680
>>> R10: 000000000000000c R11: 0000000000000216 R12:
>> 000000c000097688
>>> R13: 0000000000000000 R14: 000000c0006c3520 R15:
>> 00007f5e359946b7
>>> ORIG_RAX: 0000000000000001 CS: 0033 SS: 002b
>>>
>>> With the patch:
>>> crash> bt 493113
>>> PID: 493113 TASK: ff2e34ecbd3ca2c0 CPU: 27 COMMAND:
>> "sriov_fec_daemo"
>>> #0 [ff77abc4e81cfb08] __schedule at ffffffff81b239cb
>>> #1 [ff77abc4e81cfb70] schedule at ffffffff81b23e2d
>>> #2 [ff77abc4e81cfb88] schedule_timeout at ffffffff81b2c9e8
>>> #3 [ff77abc4e81cfc68] vfio_unregister_group_dev at ffffffffc10e76ae [vfio]
I'm still not sure how it should be fixed, but...
crash> bt -t 493113
PID: 493113 TASK: ff2e34ecbd3ca2c0 CPU: 27 COMMAND: "sriov_fec_daemo"
START: __schedule at ffffffff81b239cb
[ff77abc4e81cfb08] __schedule at ffffffff81b239cb
[ff77abc4e81cfb70] schedule at ffffffff81b23e2d
[ff77abc4e81cfb88] schedule_timeout at ffffffff81b2c9e8
[ff77abc4e81cfbb0] process_timeout at ffffffff811a09d0
[ff77abc4e81cfbf0] __wait_for_common at ffffffff81b24abb
[ff77abc4e81cfbf8] schedule_timeout at ffffffff81b2c960
[ff77abc4e81cfc68] vfio_unregister_group_dev at ffffffffc10e76ae [vfio]
crash> set debug 2
debug: 2
crash> bt 493113
#0 [ff77abc4e81cfb08] __schedule at ffffffff81b239cb
rsp: ff77abc4e81cfb08 prev_sp: ff77abc4e81cfb78 framesize: 96
--> ff77abc4e81cfb78 - 8 = [ff77abc4e81cfb70] schedule
#1 [ff77abc4e81cfb70] schedule at ffffffff81b23e2d
rsp: ff77abc4e81cfb70 prev_sp: ff77abc4e81cfb90 framesize: 16
--> ff77abc4e81cfb90 - 8 = [ff77abc4e81cfb88] schedule_timeout
#2 [ff77abc4e81cfb88] schedule_timeout at ffffffff81b2c9e8
rsp: ff77abc4e81cfb88 prev_sp: ff77abc4e81cfbf8 framesize: 96
--> ff77abc4e81cfbf8 - 8 = [ff77abc4e81cfbf0] __wait_for_common
< ignoring __wait_for_common() -- makes indirect call and NOT schedule_timeout()>
So it looks like it resolves the correct next frame (__wait_for_common)
with ORC data, but the BT_CHECK_CALLER check overwrites it.
probably the BT_CHECK_CALLER is a very old mechanism, I wonder if
it's necessary with ORC...
Could I have a few additional information?:
- What is the kernel version? (e.g. 5.14.0-362.8.1.el9_3.x86_64)
- What happens with the following patch?
--- a/x86_64.c
+++ b/x86_64.c
@@ -3342,7 +3342,7 @@ x86_64_print_stack_entry(struct bt_info *bt, FILE *ofp, int level,
bt->call_target = name;
- if (is_direct_call_target(bt)) {
+ if (!(machdep->flags & ORC) && is_direct_call_target(bt)) {
if (CRASHDEBUG(2))
fprintf(ofp, "< enable BT_CHECK_CALLER for %s >\n",
bt->call_target);
Thanks,
Kazu
>>> #4 [ff77abc4e81cfca8] vfio_pci_core_unregister_device at
>> ffffffffc11bb599 [vfio_pci_core]
>>> #5 [ff77abc4e81cfcc0] vfio_pci_remove at ffffffffc103e045 [vfio_pci]
>>> #6 [ff77abc4e81cfcd0] pci_device_remove at ffffffff815d7513
>>> #7 [ff77abc4e81cfcf0] device_release_driver_internal at
>> ffffffff81708baa
>>> #8 [ff77abc4e81cfd20] unbind_store at ffffffff81705f6f
>>> #9 [ff77abc4e81cfd50] kernfs_fop_write_iter at ffffffff81454bf1
>>> #10 [ff77abc4e81cfd88] new_sync_write at ffffffff813aad8c
>>> #11 [ff77abc4e81cfe20] vfs_write at ffffffff813adb36
>>> #12 [ff77abc4e81cfe58] ksys_write at ffffffff813adeb2
>>> #13 [ff77abc4e81cfe90] do_syscall_64 at ffffffff81b17159
>>> #14 [ff77abc4e81cff50] entry_SYSCALL_64_after_hwframe at
>> ffffffff81c0009b
>>> RIP: 000000000047cdbb RSP: 000000c0000975a8 RFLAGS: 00000216
>>> RAX: ffffffffffffffda RBX: 000000c00004e000 RCX:
>> 000000000047cdbb
>>> RDX: 000000000000000c RSI: 000000c000097798 RDI:
>> 0000000000000009
>>> RBP: 000000c0000975f8 R8: 0000000000000001 R9:
>> 000000c00098d680
>>> R10: 000000000000000c R11: 0000000000000216 R12:
>> 000000c000097688
>>> R13: 0000000000000000 R14: 000000c0006c3520 R15:
>> 00007f5e359946b7
>>> ORIG_RAX: 0000000000000001 CS: 0033 SS: 002b
>>>
>>> Let's add a check function that jump to schedule_timeout(), just like
>>> the schedule_timeout_*() in x86_64_function_called_by().
>>
>>
> Thank you for the comments, Kazu.
>
>
>> Sorry, but could you elaborate the cause of this issue and the reason
>> why the patch can fix it? I didn't get it with the commit log.
>>
>>
> I did the debugging, and also saw that it gets the called function, but
> it's not the target function, here, the target function is
> schedule_timeout(). So, we need to correct it.
>
> After the instructions 'x/i 0xffffffffc10e76a9', the stack trace was
> truncated, but it is the actual back trace. Let's see the following output
> for debugging:
>
> crash> bt 493113
> PID: 493113 TASK: ff2e34ecbd3ca2c0 CPU: 27 COMMAND: "sriov_fec_daemo"
> #0 [ff77abc4e81cfb08] __schedule at ffffffff81b239cb
> #1 [ff77abc4e81cfb70] schedule at ffffffff81b23e2d
> bt: x86_64_function_called_by 4469: x/i 0xffffffff81b2c9e3
> bt: x86_64_function_called_by 4475: 0xffffffff81b2c9e3
> <schedule_timeout+131>: call 0xffffffff81b23dd0 <schedule>
>
> bt: x86_64_function_called_by 4488: value:ffffffff81b23dd0 offset:0
> name:schedule
> #2 [ff77abc4e81cfb88] schedule_timeout at ffffffff81b2c9e8
> bt: x86_64_function_called_by 4469: x/i 0xffffffffc10e76a9
> bt: x86_64_function_called_by 4475: 0xffffffffc10e76a9
> <vfio_unregister_group_dev+121>: call 0xffffffff81b24c70
> <wait_for_completion_interruptible_timeout>
>
> bt: x86_64_function_called_by 4488: value:ffffffff81b24c70 offset:0
> name:wait_for_completion_interruptible_timeout
> bt: x86_64_function_called_by 4469: x/i 0xffffffffc11bb594
> bt: x86_64_function_called_by 4475: 0xffffffffc11bb594
> <vfio_pci_core_unregister_device+20>: call 0xffffffffc10e7630
> <vfio_unregister_group_dev>
>
> bt: x86_64_function_called_by 4488: value:ffffffffc10e7630 offset:0
> name:vfio_unregister_group_dev
> bt: x86_64_function_called_by 4469: x/i 0xffffffffc103e040
> bt: x86_64_function_called_by 4475: 0xffffffffc103e040
> <vfio_pci_remove+16>: call 0xffffffffc11bb580
> <vfio_pci_core_unregister_device>
>
> bt: x86_64_function_called_by 4488: value:ffffffffc11bb580 offset:0
> name:vfio_pci_core_unregister_device
> bt: x86_64_function_called_by 4469: x/i 0xffffffff81708ba5
> bt: x86_64_function_called_by 4475: 0xffffffff81708ba5
> <device_release_driver_internal+421>: call 0xffffffff817075a0
> <device_remove>
>
> bt: x86_64_function_called_by 4488: value:ffffffff817075a0 offset:0
> name:device_remove
> bt: x86_64_function_called_by 4469: x/i 0xffffffff81705f6a
> bt: x86_64_function_called_by 4475: 0xffffffff81705f6a
> <unbind_store+282>: call 0xffffffff81708c40 <device_driver_detach>
>
> bt: x86_64_function_called_by 4488: value:ffffffff81708c40 offset:0
> name:device_driver_detach
> bt: x86_64_function_called_by 4469: x/i 0xffffffff813adb31
> bt: x86_64_function_called_by 4475: 0xffffffff813adb31 <vfs_write+593>:
> call 0xffffffff813aac90 <new_sync_write>
>
> bt: x86_64_function_called_by 4488: value:ffffffff813aac90 offset:0
> name:new_sync_write
> bt: x86_64_function_called_by 4469: x/i 0xffffffff813adead
> bt: x86_64_function_called_by 4475: 0xffffffff813adead <ksys_write+93>:
> call 0xffffffff813ad8e0 <vfs_write>
>
> bt: x86_64_function_called_by 4488: value:ffffffff813ad8e0 offset:0
> name:vfs_write
> crash>
>
> Also, could I have the following information?
>>
>>
> Sure.
>
>
>> - output of "bt -t 493113" with the patch
>>
>
> crash> bt -t 493113
> PID: 493113 TASK: ff2e34ecbd3ca2c0 CPU: 27 COMMAND: "sriov_fec_daemo"
> START: __schedule at ffffffff81b239cb
> [ff77abc4e81cfb08] __schedule at ffffffff81b239cb
> [ff77abc4e81cfb70] schedule at ffffffff81b23e2d
> [ff77abc4e81cfb88] schedule_timeout at ffffffff81b2c9e8
> [ff77abc4e81cfbb0] process_timeout at ffffffff811a09d0
> [ff77abc4e81cfbf0] __wait_for_common at ffffffff81b24abb
> [ff77abc4e81cfbf8] schedule_timeout at ffffffff81b2c960
> [ff77abc4e81cfc68] vfio_unregister_group_dev at ffffffffc10e76ae [vfio]
> [ff77abc4e81cfca8] vfio_pci_core_unregister_device at ffffffffc11bb599
> [vfio_pci_core]
> [ff77abc4e81cfcc0] vfio_pci_remove at ffffffffc103e045 [vfio_pci]
> [ff77abc4e81cfcd0] pci_device_remove at ffffffff815d7513
> [ff77abc4e81cfcf0] device_release_driver_internal at ffffffff81708baa
> [ff77abc4e81cfd20] unbind_store at ffffffff81705f6f
> [ff77abc4e81cfd50] kernfs_fop_write_iter at ffffffff81454bf1
> [ff77abc4e81cfd88] new_sync_write at ffffffff813aad8c
> [ff77abc4e81cfe20] vfs_write at ffffffff813adb36
> [ff77abc4e81cfe58] ksys_write at ffffffff813adeb2
> [ff77abc4e81cfe90] do_syscall_64 at ffffffff81b17159
> [ff77abc4e81cfea0] do_syscall_64 at ffffffff81b17169
> [ff77abc4e81cfeb0] syscall_exit_to_user_mode at ffffffff81b1b50d
> [ff77abc4e81cfec0] do_syscall_64 at ffffffff81b17169
> [ff77abc4e81cfed0] do_syscall_64 at ffffffff81b17169
> [ff77abc4e81cfed8] do_syscall_64 at ffffffff81b17169
> [ff77abc4e81cfee0] syscall_exit_to_user_mode at ffffffff81b1b50d
> [ff77abc4e81cfef0] do_syscall_64 at ffffffff81b17169
> [ff77abc4e81cfef8] __context_tracking_enter at ffffffff81b1b6fc
> [ff77abc4e81cff08] syscall_exit_to_user_mode at ffffffff81b1b50d
> [ff77abc4e81cff18] do_syscall_64 at ffffffff81b17169
> [ff77abc4e81cff20] do_syscall_64 at ffffffff81b17169
> [ff77abc4e81cff28] do_syscall_64 at ffffffff81b17169
> [ff77abc4e81cff30] do_syscall_64 at ffffffff81b17169
> [ff77abc4e81cff38] __context_tracking_enter at ffffffff81b1b6fc
> [ff77abc4e81cff50] entry_SYSCALL_64_after_hwframe at ffffffff81c0009b
> RIP: 000000000047cdbb RSP: 000000c0000975a8 RFLAGS: 00000216
> RAX: ffffffffffffffda RBX: 000000c00004e000 RCX: 000000000047cdbb
> RDX: 000000000000000c RSI: 000000c000097798 RDI: 0000000000000009
> RBP: 000000c0000975f8 R8: 0000000000000001 R9: 000000c00098d680
> R10: 000000000000000c R11: 0000000000000216 R12: 000000c000097688
> R13: 0000000000000000 R14: 000000c0006c3520 R15: 00007f5e359946b7
> ORIG_RAX: 0000000000000001 CS: 0033 SS: 002b
> crash>
>
> - output of "bt 493113" after "set debug 2" without the patch.
>>
>
> crash> set debug 2
> debug: 2
> crash> bt 493113
> PID: 493113 TASK: ff2e34ecbd3ca2c0 CPU: 27 COMMAND: "sriov_fec_daemo"
> rsp: ff77abc4e81cfad8 rbp: ff2e34ff19aeb140
> #0 [ff77abc4e81cfb08] __schedule at ffffffff81b239cb
> orc_find:
> ip: ffffffff81b239cb idx: 45625
> start = orc_lookup[45625]: 419274
> stop = orc_lookup[45626] + 1: 419283
> ip table start: ffffffff8312bbcc
> unwind table start: ffffffff833a0ff8
> __orc_find:
> ip: ffffffff81b239cb num_entries: 9
> orc_ip(ffffffff8312bbcc): fe9f7bbf -> ffffffff81b2378b / __schedule+27 ->
> ffffffff833a0ff8
> orc_ip(ffffffff8312bbd0): fe9f7e1b -> ffffffff81b239eb / __schedule+635
> -> ffffffff833a0ffe
> orc_ip(ffffffff8312bbd4): fe9f7e18 -> ffffffff81b239ec / __schedule+636
> -> ffffffff833a1004
> orc_ip(ffffffff8312bbd8): fe9f7e15 -> ffffffff81b239ed / __schedule+637
> -> ffffffff833a100a
> orc_ip(ffffffff8312bbdc): fe9f7e13 -> ffffffff81b239ef / __schedule+639
> -> ffffffff833a1010
> orc_ip(ffffffff8312bbe0): fe9f7e11 -> ffffffff81b239f1 / __schedule+641
> -> ffffffff833a1016
> orc_ip(ffffffff8312bbe4): fe9f7e0f -> ffffffff81b239f3 / __schedule+643
> -> ffffffff833a101c
> orc_ip(ffffffff8312bbe8): fe9f7e0d -> ffffffff81b239f5 / __schedule+645
> -> ffffffff833a1022
> orc_ip(ffffffff8312bbec): fe9f7e0e -> ffffffff81b239fa / __schedule+650
> -> ffffffff833a1028
> found: ffffffff8312bbcc index: 0
> orc_entry: ffffffff833a0ff8 sp_offset: 104 bp_offset: -48 sp_reg: 5
> bp_reg: 1 type: 0 end: 0
> rsp: ff77abc4e81cfb08 textaddr: ffffffff81b239cb -> spo: 104 bpo: -48 spr:
> 5 bpr: 1 type: 0 end: 0
> rsp: ff77abc4e81cfb08 prev_sp: ff77abc4e81cfb78 framesize: 96
> rsp: ff77abc4e81cfb08 prev_sp: ff77abc4e81cfb78 prev_bp: ff77abc4e81cfb48
> -> ff2e34ecbd3ca2c0
> #1 [ff77abc4e81cfb70] schedule at ffffffff81b23e2d
> < enable BT_CHECK_CALLER for schedule >
> orc_find:
> ip: ffffffff81b23e2d idx: 45630
> start = orc_lookup[45630]: 419286
> stop = orc_lookup[45631] + 1: 419298
> ip table start: ffffffff8312bbfc
> unwind table start: ffffffff833a1040
> __orc_find:
> ip: ffffffff81b23e2d num_entries: 12
> orc_ip(ffffffff8312bbfc): fe9f81e4 -> ffffffff81b23de0 / schedule+16 ->
> ffffffff833a1040
> orc_ip(ffffffff8312bc00): fe9f8254 -> ffffffff81b23e54 / schedule+132 ->
> ffffffff833a1046
> orc_ip(ffffffff8312bc04): fe9f8251 -> ffffffff81b23e55 / schedule+133 ->
> ffffffff833a104c
> orc_ip(ffffffff8312bc08): fe9f8252 -> ffffffff81b23e5a / schedule+138 ->
> ffffffff833a1052
> orc_ip(ffffffff8312bc0c): fe9f8260 -> ffffffff81b23e6c / schedule+156 ->
> ffffffff833a1058
> orc_ip(ffffffff8312bc10): fe9f825d -> ffffffff81b23e6d / schedule+157 ->
> ffffffff833a105e
> orc_ip(ffffffff8312bc14): fe9f825e -> ffffffff81b23e72 / schedule+162 ->
> ffffffff833a1064
> orc_ip(ffffffff8312bc18): fe9f827d -> ffffffff81b23e95 / schedule+197 ->
> ffffffff833a106a
> orc_ip(ffffffff8312bc1c): fe9f8284 -> ffffffff81b23ea0 / yield+0 ->
> ffffffff833a1070
> orc_ip(ffffffff8312bc20): fe9f8298 -> ffffffff81b23eb8 / yield+24 ->
> ffffffff833a1076
> orc_ip(ffffffff8312bc24): fe9f829c -> ffffffff81b23ec0 / io_schedule+0 ->
> ffffffff833a107c
> orc_ip(ffffffff8312bc28): fe9f829e -> ffffffff81b23ec6 / io_schedule+6 ->
> ffffffff833a1082
> found: ffffffff8312bbfc index: 0
> orc_entry: ffffffff833a1040 sp_offset: 24 bp_offset: -16 sp_reg: 5
> bp_reg: 1 type: 0 end: 0
> rsp: ff77abc4e81cfb70 textaddr: ffffffff81b23e2d -> spo: 24 bpo: -16 spr: 5
> bpr: 1 type: 0 end: 0
> rsp: ff77abc4e81cfb70 prev_sp: ff77abc4e81cfb90 framesize: 16
> rsp: ff77abc4e81cfb70 prev_sp: ff77abc4e81cfb90 prev_bp: ff77abc4e81cfb80
> -> 101047510
> #2 [ff77abc4e81cfb88] schedule_timeout at ffffffff81b2c9e8
> < enable BT_CHECK_CALLER for schedule_timeout >
> orc_find:
> ip: ffffffff81b2c9e8 idx: 45769
> start = orc_lookup[45769]: 420322
> stop = orc_lookup[45770] + 1: 420333
> ip table start: ffffffff8312cc2c
> unwind table start: ffffffff833a2888
> __orc_find:
> ip: ffffffff81b2c9e8 num_entries: 11
> orc_ip(ffffffff8312cc2c): fe9ffcc3 -> ffffffff81b2c8ef /
> usleep_range_state+31 -> ffffffff833a2888
> orc_ip(ffffffff8312cc30): fe9ffd18 -> ffffffff81b2c948 /
> usleep_range_state+120 -> ffffffff833a288e
> orc_ip(ffffffff8312cc34): fe9ffd15 -> ffffffff81b2c949 /
> usleep_range_state+121 -> ffffffff833a2894
> orc_ip(ffffffff8312cc38): fe9ffd12 -> ffffffff81b2c94a /
> usleep_range_state+122 -> ffffffff833a289a
> orc_ip(ffffffff8312cc3c): fe9ffd10 -> ffffffff81b2c94c /
> usleep_range_state+124 -> ffffffff833a28a0
> orc_ip(ffffffff8312cc40): fe9ffd11 -> ffffffff81b2c951 /
> usleep_range_state+129 -> ffffffff833a28a6
> orc_ip(ffffffff8312cc44): fe9ffd12 -> ffffffff81b2c956 /
> usleep_range_state+134 -> ffffffff833a28ac
> orc_ip(ffffffff8312cc48): fe9ffd18 -> ffffffff81b2c960 /
> schedule_timeout+0 -> ffffffff833a28b2
> orc_ip(ffffffff8312cc4c): fe9ffd1b -> ffffffff81b2c967 /
> schedule_timeout+7 -> ffffffff833a28b8
> orc_ip(ffffffff8312cc50): fe9ffd18 -> ffffffff81b2c968 /
> schedule_timeout+8 -> ffffffff833a28be
> orc_ip(ffffffff8312cc54): fe9ffd18 -> ffffffff81b2c96c /
> schedule_timeout+12 -> ffffffff833a28c4
> found: ffffffff8312cc54 index: 10
> orc_entry: ffffffff833a28c4 sp_offset: 104 bp_offset: -24 sp_reg: 5
> bp_reg: 1 type: 0 end: 0
> rsp: ff77abc4e81cfb88 textaddr: ffffffff81b2c9e8 -> spo: 104 bpo: -24 spr:
> 5 bpr: 1 type: 0 end: 0
> rsp: ff77abc4e81cfb88 prev_sp: ff77abc4e81cfbf8 framesize: 96
> rsp: ff77abc4e81cfb88 prev_sp: ff77abc4e81cfbf8 prev_bp: ff77abc4e81cfbe0
> -> 2710
> < ignoring __wait_for_common() -- makes indirect call and NOT
> schedule_timeout()>
> < ignoring vfio_unregister_group_dev() -- calls
> wait_for_completion_interruptible_timeout() and NOT schedule_timeout()>
> < ignoring vfio_pci_core_unregister_device() -- calls
> vfio_unregister_group_dev() and NOT schedule_timeout()>
> < ignoring vfio_pci_remove() -- calls vfio_pci_core_unregister_device() and
> NOT schedule_timeout()>
> < ignoring pci_device_remove() -- makes indirect call and NOT
> schedule_timeout()>
> < ignoring device_release_driver_internal() -- calls device_remove() and
> NOT schedule_timeout()>
> < ignoring unbind_store() -- calls device_driver_detach() and NOT
> schedule_timeout()>
> < ignoring kernfs_fop_write_iter() -- makes indirect call and NOT
> schedule_timeout()>
> < ignoring new_sync_write() -- makes indirect call and NOT
> schedule_timeout()>
> < ignoring vfs_write() -- calls new_sync_write() and NOT schedule_timeout()>
> < ignoring ksys_write() -- calls vfs_write() and NOT schedule_timeout()>
> < ignoring do_syscall_64() -- makes indirect call and NOT
> schedule_timeout()>
> < ignoring do_syscall_64() -- calls syscall_exit_to_user_mode() and NOT
> schedule_timeout()>
> < ignoring syscall_exit_to_user_mode() -- calls __context_tracking_enter()
> and NOT schedule_timeout()>
> < ignoring do_syscall_64() -- calls syscall_exit_to_user_mode() and NOT
> schedule_timeout()>
> < ignoring do_syscall_64() -- calls syscall_exit_to_user_mode() and NOT
> schedule_timeout()>
> < ignoring do_syscall_64() -- calls syscall_exit_to_user_mode() and NOT
> schedule_timeout()>
> < ignoring syscall_exit_to_user_mode() -- calls __context_tracking_enter()
> and NOT schedule_timeout()>
> < ignoring do_syscall_64() -- calls syscall_exit_to_user_mode() and NOT
> schedule_timeout()>
> < ignoring __context_tracking_enter() -- calls __this_cpu_preempt_check()
> and NOT schedule_timeout()>
> < ignoring syscall_exit_to_user_mode() -- calls __context_tracking_enter()
> and NOT schedule_timeout()>
> < ignoring do_syscall_64() -- calls syscall_exit_to_user_mode() and NOT
> schedule_timeout()>
> < ignoring do_syscall_64() -- calls syscall_exit_to_user_mode() and NOT
> schedule_timeout()>
> < ignoring do_syscall_64() -- calls syscall_exit_to_user_mode() and NOT
> schedule_timeout()>
> < ignoring do_syscall_64() -- calls syscall_exit_to_user_mode() and NOT
> schedule_timeout()>
> < ignoring __context_tracking_enter() -- calls __this_cpu_preempt_check()
> and NOT schedule_timeout()>
> < ignoring entry_SYSCALL_64_after_hwframe() -- calls do_syscall_64() and
> NOT schedule_timeout()>
> < exception frame at: ff77abc4e81cff58 >
> RIP: 000000000047cdbb RSP: 000000c0000975a8 RFLAGS: 00000216
> RAX: ffffffffffffffda RBX: 000000c00004e000 RCX: 000000000047cdbb
> RDX: 000000000000000c RSI: 000000c000097798 RDI: 0000000000000009
> RBP: 000000c0000975f8 R8: 0000000000000001 R9: 000000c00098d680
> R10: 000000000000000c R11: 0000000000000216 R12: 000000c000097688
> R13: 0000000000000000 R14: 000000c0006c3520 R15: 00007f5e359946b7
> ORIG_RAX: 0000000000000001 CS: 0033 SS: 002b
> crash>
>
> Thanks.
> Lianbo
>
>
>>
>> Thanks,
>> Kazu
>>
>>>
>>> Signed-off-by: Lianbo Jiang <lijiang@xxxxxxxxxx>
>>> ---
>>> x86_64.c | 3 ++-
>>> 1 file changed, 2 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/x86_64.c b/x86_64.c
>>> index 42ade4817ad9..16850d98dc2d 100644
>>> --- a/x86_64.c
>>> +++ b/x86_64.c
>>> @@ -4487,7 +4487,8 @@ x86_64_function_called_by(ulong rip)
>>> */
>>> if (sp) {
>>> if ((STREQ(sp->name, "schedule_timeout_interruptible") ||
>>> - STREQ(sp->name, "schedule_timeout_uninterruptible")))
>>> + STREQ(sp->name, "schedule_timeout_uninterruptible") ||
>>> + STREQ(sp->name,
>> "wait_for_completion_interruptible_timeout")))
>>> sp = symbol_search("schedule_timeout");
>>>
>>> if (STREQ(sp->name, "__cond_resched"))
>>>
--
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