Re: "panic: mutex Giant not owned" in do_execve()

From: John Baldwin (jhb_at_FreeBSD.org)
Date: 06/27/05

  • Next message: John Baldwin: "Re: "panic: mutex Giant not owned" in do_execve()" 
    To: freebsd-current@freebsd.org
Date: Mon, 27 Jun 2005 16:56:14 -0400

    On Monday 20 June 2005 04:47 pm, Jeff Roberson wrote:
    > On Fri, 17 Jun 2005, Kris Kennaway wrote:
    > > quad e450 running up-to-date -current:
    > >
    > > panic: mutex Giant not owned at ../../../kern/kern_mutex.c:299
    > > cpuid = 0
    > > KDB: enter: panic
    > > [thread pid 52851 tid 100456 ]
    > > Stopped at kdb_enter+0x3c: ta %xcc, 1
    > > db> wh
    > > Tracing pid 52851 tid 100456 td 0xfffff80077c61560
    > > panic() at panic+0x16c
    > > _mtx_assert() at _mtx_assert+0x6c
    > > _mtx_unlock_flags() at _mtx_unlock_flags+0x68
    > > do_execve() at do_execve+0xa0c
    >
    > Can you tell me what code is at do_execve+0xa0c?

    It's down below. It's the VFS_UNLOCK_GIANT() after the #ifdef MAC stuff:

    > > kern_execve() at kern_execve+0x7c
    > > execve() at execve+0x38
    > > syscall() at syscall+0x2d4
    > > -- reserved %o7=0 --
    > > userland() at 0x40223400
    > > user trace: trap %o7=0
    > > pc 0x40223400, sp 0x7fdffffd021
    > > done
    > >
    > > #12 0x00000000c01525cc in do_execve (td=0xfffff80077c61560, args=0xc,
    > > mac_p=0x0) at ../../../kern/kern_exec.c:789
    > > #13 0x00000000c0151b3c in kern_execve (td=0xfffff80077c61560,
    > > args=0xeea6f670, mac_p=0x0) at
    > > ../../../kern/kern_exec.c:250
    > > #14 0x00000000c0151a78 in execve (td=0xfffff80077c61560, uap=0xeea6f8c0)
    > > at ../../../kern/kern_exec.c:185
    > > #15 0x00000000c02f3cd4 in syscall (tf=0xeea6f880) at
    > > ../../../sparc64/sparc64/trap.c:592
    > > (kgdb) frame 12
    > > #12 0x00000000c01525cc in do_execve (td=0xfffff80077c61560, args=0xc,
    > > mac_p=0x0) at ../../../kern/kern_exec.c:789
    > > 789 VFS_UNLOCK_GIANT(vfslocked);
    > > (kgdb) list
    > > 784 #ifdef MAC
    > > 785 mac_execve_exit(imgp);
    > > 786 if (interplabel != NULL)
    > > 787 mac_vnode_label_free(interplabel);
    > > 788 #endif
    > > 789 VFS_UNLOCK_GIANT(vfslocked);
    > > 790 return (error);
    > > 791 }
    > > 792
    > > 793 int

    See, line 789 here. 

    -- 
John Baldwin <jhb@FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org
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