[Bug uprobes/13539] occasional oops, kernel SEGV, RHEL5, :uprobes:uprobe_free_process+0xba/0x131

["dsmith at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=13539

David Smith <dsmith at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dsmith at redhat dot com

--- Comment #5 from David Smith <dsmith at redhat dot com> 2012-01-06 16:56:25 UTC ---
I've reproduced this oops.  Here's how.  I wasn't able to reproduce this in a
vm.  Here are the details of the hardware/software I've duplicated this on.

x86_64
2.6.18-301.el5debug
4 cpus
1Gb memory

Note that I couldn't duplicate the oops with the regular kernel, only the debug
kernel.

with the code on the pr13539 branch, I'm seeing a hang in stapio:

    Jan 5 15:48:27 hp-dl140g2-01 kernel:
stap_29f5d7d6b50882b60786646febccf5da_2100: systemtap: 1.7/0.152, base:
ffffffff8862e000, memory: 94data/25text/2ctx/2058net/34alloc kb, probes: 2,
unpriv-uid: 0
    Jan 5 15:48:27 hp-dl140g2-01 kernel: uprobe_report_clone ffff810023d7e118
4525=4525
    Jan 5 15:48:27 hp-dl140g2-01 kernel: uprobe_report_clone2 ffff810023d7e118
4525=4525
    Jan 5 15:48:27 hp-dl140g2-01 kernel: uprobe_report_exit ffff810023d7e118
4525=4528
    Jan 5 15:48:27 hp-dl140g2-01 kernel: uprobe_report_exit1a ffff810023d7e118
4525=4528
    Jan 5 15:48:27 hp-dl140g2-01 kernel: uprobe_report_exit2 ffff810023d7e118
4525=4528
    Jan 5 15:48:27 hp-dl140g2-01 kernel: uprobe_free_task ffff81002c1604d0 (tid
4528), caller ffffffff8861fbfcS, ctid 4528
    Jan 5 15:48:27 hp-dl140g2-01 kernel: uprobe_report_exit3 ffff810023d7e118
4525=4528
    Jan 5 15:48:27 hp-dl140g2-01 kernel: uprobe_report_exit4 ffff810023d7e118
4525=4528
    Jan 5 15:48:27 hp-dl140g2-01 kernel: uprobe_report_quiesce ffff810023d7e118
4525=4525
    Jan 5 15:48:27 hp-dl140g2-01 kernel: uprobe_report_quiesce2
ffff810023d7e118 4525=4525
    Jan 5 15:48:27 hp-dl140g2-01 kernel: uprobe_report_quiesce3
ffff810023d7e118 4525=4525
    Jan 5 15:48:27 hp-dl140g2-01 kernel: uprobe_free_process ffff810023d7e118
(pid 4525), caller ffffffff8861e048S, ctid 4518
    Jan 5 15:48:27 hp-dl140g2-01 kernel: uprobe_free_task ffff81002c160188 (tid
4525), caller ffffffff8861dfb2S, ctid 4518
    Jan 5 15:48:27 hp-dl140g2-01 kernel: uprobe_free_process zap
ffff810023d7e118
    Jan 5 15:48:27 hp-dl140g2-01 kernel:
stap_65966cac75d5cb53185970245c71624b_2107: systemtap: 1.7/0.152, base:
ffffffff8862e000, memory: 94data/25text/2ctx/2058net/34alloc kb, probes: 2,
unpriv-uid: 0
    Jan 5 15:48:27 hp-dl140g2-01 kernel: uprobe_report_clone ffff81002bfd7238
4651=4651
    Jan 5 15:48:27 hp-dl140g2-01 kernel: uprobe_report_clone2 ffff81002bfd7238
4651=4651
    Jan 5 15:48:27 hp-dl140g2-01 kernel: uprobe_report_quiesce ffff81002bfd7238
4651=4651
    Jan 5 15:48:27 hp-dl140g2-01 kernel: uprobe_report_exit ffff81002bfd7238
4651=4654
    Jan 5 15:48:27 hp-dl140g2-01 kernel: uprobe_report_quiesce2
ffff81002bfd7238 4651=4651
    Jan 5 15:48:27 hp-dl140g2-01 kernel: uprobe_report_quiesce3
ffff81002bfd7238 4651=4651
    Jan 5 15:48:27 hp-dl140g2-01 kernel: uprobe_report_exit1a ffff81002bfd7238
4651=4654
    Jan 5 15:48:27 hp-dl140g2-01 kernel: uprobe_report_exit2 ffff81002bfd7238
4651=4654
    Jan 5 15:48:27 hp-dl140g2-01 kernel: uprobe_free_task ffff81002c6203b8 (tid
4654), caller ffffffff8861fbfcS, ctid 4654
    Jan 5 15:48:27 hp-dl140g2-01 kernel: uprobe_report_exit3 ffff81002bfd7238
4651=4654
    Jan 5 15:48:27 hp-dl140g2-01 kernel: uprobe_report_exit4 ffff81002bfd7238
4651=4654
    INFO: task stapio:4645 blocked for more than 120 seconds.
    "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
    stapio D ffff81002b784608 0 4645 4544 4651 4652 (NOTLB)
    ffff81001cc33dc8 0000000000000046 0000000000000000 0000000000000046
    ffff81002bfd7240 0000000000000004 ffff81001ad94640 ffff810037c5e300
    000000967ed8046e 0000000000012432 ffff81001ad94828 000000022c9b70d8
    Call Trace:
    [<ffffffff8861eae3>] :uprobes:__unregister_uprobe+0x1ef/0x22f
    [<ffffffff800a811e>] autoremove_wake_function+0x0/0x2e
    [<ffffffff88632abe>]
:stap_65966cac75d5cb53185970245c71624b_2107:_stp_cleanup_and_exit+0x140/0x311
    [<ffffffff88632dbc>]
:stap_65966cac75d5cb53185970245c71624b_2107:_stp_ctl_write_cmd+0xf1/0xdbd
    [<ffffffff8013d5fd>] file_has_perm+0x48/0xa3
    [<ffffffff80017827>] vfs_write+0xce/0x174
    [<ffffffff8001811b>] sys_write+0x45/0x6e
    [<ffffffff800602a6>] tracesys+0xd5/0xdf

    no locks held by stapio/4645.

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