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[Bug uprobes/6829] New: uprobe on cloney shell hangs

# stap -e 'probe process("zsh").function("main") {log(pp())}' &
% zsh
<HANGS>

A sysrq-t indicates:

zsh           R  running task       0 26625   2089               26440 (NOTLB)
zsh           D ffff810009992000     0 26632      1                2056 (NOTLB)
 ffff810010961d78 0000000000000086 ffff8100065881c0 0000003c2e81bad0
 0000003c2e81aba0 0000000000000007 ffff81001b533100 ffffffff802e4ae0
 00005d381f02a072 00000000001c6920 ffff81001b5332e8 0000000020000000
Call Trace:
 [<ffffffff80063bc7>] __mutex_lock_slowpath+0x60/0x9b
 [<ffffffff80041a14>] d_path+0xdf/0xef
 [<ffffffff80063c11>] .text.lock.mutex+0xf/0x14
 [<ffffffff883f495d>] :stap_26440:stap_uprobe_process_found+0x36/0x15e
 [<ffffffff883f37af>] :stap_26440:__stp_utrace_attach_match_tsk+0x17c/0x22f
 [<ffffffff883f38af>] :stap_26440:__stp_utrace_task_finder_report_exec+0x4d/0x4f
 [<ffffffff800bd589>] utrace_report_exec+0x58/0x187
 [<ffffffff8003f49b>] search_binary_handler+0x171/0x26d
 [<ffffffff8003e950>] do_execve+0x18c/0x243
 [<ffffffff80054760>] sys_execve+0x36/0x4c
 [<ffffffff8005d4d3>] stub_execve+0x67/0xb0

zsh           D ffffffff88407598     0  2089   2032 26440               (NOTLB)
 ffff810013c97d68 0000000000000082 ffff8100155e7a00 ffff81001ddf4940
 0000000000000001 0000000000000009 ffff81001ff0e7e0 ffffffff802e4ae0
 00005cf4ce56215c 00000000000ba126 ffff81001ff0e9c8 00000000800bc6bb
Call Trace:
 [<ffffffff883e1dc1>] :uprobes:register_uprobe+0x78c/0x857
 [<ffffffff8009df05>] autoremove_wake_function+0x0/0x2e
 [<ffffffff883f4a72>] :stap_26440:stap_uprobe_process_found+0x14b/0x15e
 [<ffffffff883f37af>] :stap_26440:__stp_utrace_attach_match_tsk+0x17c/0x22f
 [<ffffffff883f3904>] :stap_26440:__stp_utrace_task_finder_report_clone+0x53/0x55
 [<ffffffff800bd104>] utrace_report_clone+0x56/0x185
 [<ffffffff80030f3c>] do_fork+0xd7/0x187
 [<ffffffff8005d28d>] tracesys+0xd5/0xe0
 [<ffffffff8005d427>] ptregscall_common+0x67/0xac

-- 
           Summary: uprobe on cloney shell hangs
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: uprobes
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: fche at redhat dot com
  GCC host triplet: x86-64


http://sourceware.org/bugzilla/show_bug.cgi?id=6829

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