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    SubjectRe: 2.6.15-rc1-mm2 breaks strace
    Bernhard Rosenkraenzer wrote:
    >2.6.15-rc1-mm2 works nicely here, aside from the artsd stuff someone else
    >already reported, and an new issue with strace (last known working:
    >2.6.14-mm2)
    I think, that the problem emerged in rc1-mm1, there are some changes in ptrace.c
    (2.6.14-mm2 works fine for me).
    >
    >[bero@localhost bero]$ strace ls
    >execve("/bin/ls", ["ls"], [/* 33 vars */]) = 0
    >Segmentation fault
    >[ls output without any traces beyond execve-ing ls displayed here]
    >
    >Also interesting:
    >[bero@localhost bero]$ strace strace ls
    >execve("/usr/bin/strace", ["strace", "ls"], [/* 20 vars */]) = 0
    >Segmentation fault
    >execve("/bin/ls", ["ls"], [/* 20 vars */]) = 0
    >[ls output without any traces displayed here]

    And I have this in logs:

    Unable to handle kernel NULL pointer dereference at virtual address 00000010 printing eip:
    c0125a25
    *pde = 00000000
    Oops: 0000 [#1]
    PREEMPT SMP
    last sysfs file: /devices/platform/i2c-9191/9191-0290/temp3_input
    Modules linked in: usblp it87 hwmon_vid i2c_isa sunrpc ipv6 video ohci1394 ieee1394 emu10k1_gp gameport ide_cd cdrom
    CPU: 0
    EIP: 0060:[<c0125a25>] Not tainted VLI
    EFLAGS: 00210206 (2.6.15-rc1-mm2)
    EIP is at ptrace_check_attach+0x19/0xb8
    eax: 00ffffff ebx: 00000000 ecx: c5ea0b3c edx: c5ea0b38
    esi: 00000000 edi: 00000000 ebp: c6106f90 esp: c6106f80
    ds: 007b es: 007b ss: 0068
    Process strace (pid: 23486, threadinfo=c6106000 task=c17ba550)
    Stack: c01262dc 00000000 00000000 00000018 c6106fb4 c0126344 00000000 00000000
    00000000 c6106fbc 00000018 00000000 5000cff4 c6106000 c0102e15 00000018
    00005bbf 00000001 00000000 5000cff4 bf8ced48 ffffffda 0000007b c010007b
    Call Trace:
    [<c0103c82>] show_stack+0x9a/0xd0
    [<c0103e42>] show_registers+0x16a/0x1fa
    [<c010407c>] die+0x123/0x1ae
    [<c03c3b3c>] do_page_fault+0x33c/0x66e
    [<c010393b>] error_code+0x4f/0x54
    [<c0126344>] sys_ptrace+0x5a/0xcf
    [<c0102e15>] syscall_call+0x7/0xb
    Code: cc ba 42 c0 c7 43 68 c8 ba 42 c0 89 50 04 89 02 eb a4 55 89 e5 57 56 53 83 ec 04 8b 75 08 8b 7d 0c b8 00 2d 4c c0 e8 16 d5 29 00 <8b> 56 10 f6 c2 01 75 25 bb fd ff ff ff b8 00 2d 4c c0 e8 65 d7
    <3>BUG: strace[23486] exited with nonzero preempt_count 1!

    regards,
    --
    Jiri Slaby www.fi.muni.cz/~xslaby
    \_.-^-._ jirislaby@gmail.com _.-^-._/
    B67499670407CE62ACC8 22A032CC55C339D47A7E
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