[Crash-utility] Re: [PATCH] Fix for "bt pid" command not printing enough stack trace

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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]
>     #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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