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    SubjectRe: crash in entry.S restore_all, 2.6.12-rc2, x86, PAGEALLOC
    Ingo Molnar <mingo@elte.hu> wrote:
    >
    > --- linux/arch/i386/kernel/entry.S.orig
    > +++ linux/arch/i386/kernel/entry.S
    > @@ -179,12 +179,17 @@ need_resched:
    > ENTRY(sysenter_entry)
    > movl TSS_sysenter_esp0(%esp),%esp
    > sysenter_past_esp:
    > - sti
    > + #
    > + # irqs are disabled: set up an entry stackframe without
    > + # allowing irqs to potentially preempt us with an
    > + # incomplete entry frame!
    > + #
    > pushl $(__USER_DS)
    > pushl %ebp
    > pushfl
    > pushl $(__USER_CS)
    > pushl $SYSENTER_RETURN
    > + sti
    >

    Well that bites the big one.


    Program received signal SIGTRAP, Trace/breakpoint trap.
    0xc015c4ba in __find_get_block (bdev=0xc18cd988, block=2818614, size=4096) at fs/buffer.c:1371
    1371 BUG_ON(irqs_disabled());
    (gdb) t
    [Current thread is 0 (Thread 32768)]
    (gdb) bt
    #0 0xc015c4ba in __find_get_block (bdev=0xc18cd988, block=2818614, size=4096) at fs/buffer.c:1371
    #1 0xc015c57b in __getblk (bdev=0xc18cd988, block=2818614, size=4096) at fs/buffer.c:1487
    #2 0xc0199978 in ext3_getblk (handle=0x0, inode=0xcff2a2b4, block=1, create=0, errp=0xcdf61dbc) at include/linux/buffer_head.h:260
    #3 0xc019d5a6 in ext3_find_entry (dentry=0xcdaef8d4, res_dir=0xcdf61dfc) at fs/ext3/namei.c:868
    #4 0xc019d9ca in ext3_lookup (dir=0x1, dentry=0xcdaef8d4, nd=0xcdf61f58) at fs/ext3/namei.c:988
    #5 0xc0166b2d in real_lookup (parent=0xcdaef8d4, name=0xcdf61e8c, nd=0xcdf61f58) at fs/namei.c:416
    #6 0xc0166df3 in do_lookup (nd=0xcdf61f58, name=0xcdf61e8c, path=0xcdf61e84) at fs/namei.c:670
    #7 0xc0167667 in __link_path_walk (name=0xcdd24011 "", nd=0xcdf61f58) at fs/namei.c:833
    #8 0xc0167c28 in link_path_walk (name=0xcdd24000 "/lib/libpcre.so.0", nd=0xcdf61f58) at fs/namei.c:911
    #9 0xc0168056 in path_lookup (name=0xcdd24000 "/lib/libpcre.so.0", flags=0, nd=0xcdf61f58) at fs/namei.c:1026
    #10 0xc016877d in open_namei (pathname=0xcdd24000 "/lib/libpcre.so.0", flag=1, mode=-1208907480, nd=0xcdf61f58) at fs/namei.c:1420
    #11 0xc0159256 in filp_open (filename=0xcdd24000 "/lib/libpcre.so.0", flags=0, mode=-1208907480) at fs/open.c:764
    #12 0xc01595e6 in sys_open (filename=0x1 <Address 0x1 out of bounds>, flags=1, mode=1) at fs/open.c:946
    #13 0xc0102e91 in syscall_call () at arch/i386/kernel/semaphore.c:177
    #14 0xb7f22c8a in ?? ()

    Is someone doing a syscall with irqs disabled, or what?

    This fixes it...



    --- 25/arch/i386/kernel/entry.S~sysenter-irq-atomicity-fix-fix 2005-04-07 04:03:07.000000000 -0700
    +++ 25-akpm/arch/i386/kernel/entry.S 2005-04-07 04:05:47.000000000 -0700
    @@ -187,6 +187,7 @@ sysenter_past_esp:
    pushl $(__USER_DS)
    pushl %ebp
    pushfl
    + orl $0x200,0(%esp)
    pushl $(__USER_CS)
    pushl $SYSENTER_RETURN
    sti
    _
    -
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