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    SubjectRe: + proc-dont-lock-task_structs-indefinitely-cpuset-fix-2.patch added to -mm tree
    Eric wrote:
    > I can kill a kernel this way as well. Thanks this looks like
    > a good reproducer I will see if I can figure out why.

    I suspect two problems, one with your patches that the fuser provokes,
    and a separate bug earlier in *-mm that the DEBUG options noted below
    provoke.

    Details:

    In addition to the problem that shows up with the three patches
    > proc-dont-lock-task_structs-indefinitely.patch
    > proc-dont-lock-task_structs-indefinitely-git-nfs-fix.patch
    > proc-dont-lock-task_structs-indefinitely-cpuset-fix.patch

    when running the fuser command:
    > /bin/fuser -n tcp 5553

    I am seeing as a separate bug the crash during boot that I reported
    last, when I turned on some DEBUG options. That crash occurs even with
    none of your proc patches.

    That is, to be specific, with this patch at the top of my applied stack:
    rtc-subsystem-rs5c372-driver.patch

    and these patches at the front of my unapplied queue:
    trivial-cleanup-to-proc_check_chroot.patch
    proc-fix-the-inode-number-on-proc-pid-fd.patch

    and the debug options:
    > CONFIG_DEBUG_SLAB=y
    > CONFIG_DEBUG_SPINLOCK=y
    > CONFIG_DEBUG_SPINLOCK_SLEEP=y

    I die during system boot with:
    ==============================

    ...
    pci_hotplug: PCI Hot Plug PCI Core version: 0.5
    SGI Altix RTC Timer: v2.1, 20 MHz
    EFI Time Services Driver v0.4
    Linux agpgart interface v0.101 (c) Dave Jones
    sn_console: Console driver init
    ttySG0 at I/O 0x0 (irq = 0) is a SGI SN L1
    Unable to handle kernel NULL pointer dereference (address 0000000000000058)
    swapper[1]: Oops 8813272891392 [1]
    Modules linked in:

    Pid: 1, CPU 0, comm: swapper
    psr : 0000101008026018 ifs : 800000000000040b ip : [<a0000001001f0a50>] Not tainted
    ip is at sysfs_create_group+0x30/0x2a0
    unat: 0000000000000000 pfs : 0000000000000308 rsc : 0000000000000003
    rnat: 0000000002000027 bsps: 0000000000000002 pr : 0000000000005649
    ldrs: 0000000000000000 ccv : 0000000000000000 fpsr: 0009804c8a70433f
    csd : 0000000000000000 ssd : 0000000000000000
    b0 : a00000010081ad30 b6 : e000023002310080 b7 : a00000010081ad80
    f6 : 1003e0000000000000000 f7 : 1003e20c49ba5e353f7cf
    f8 : 1003e0000000000002ff0 f9 : 1003e0000000000000068
    f10 : 1003e0000000000000000 f11 : 1003e0000000000000000
    r1 : a000000100c93ab0 r2 : 0000000000000058 r3 : a000000100aa3560
    r8 : 0000000000000000 r9 : a000000100cba7a0 r10 : ffffffffffffffff
    r11 : 0000000000000400 r12 : e00002343bdb7d50 r13 : e00002343bdb0000
    r14 : a000000100aa8300 r15 : a000000100cba7a0 r16 : a000000100aa3568
    r17 : 00000000000003c0 r18 : 0000000000000001 r19 : 0000000000000002
    r20 : ffffffffffffffff r21 : 000000000000000e r22 : 0000000000000000
    r23 : a000000100a94eb8 r24 : a000000100824c80 r25 : a000000100aa3b18
    r26 : 0000000000004000 r27 : a000000100913e80 r28 : e00002343b2d3918
    r29 : 0000000000000001 r30 : a0000001007d9228 r31 : a00000010081ad80

    Call Trace:
    [<a000000100013280>] show_stack+0x40/0xa0
    sp=e00002343bdb78e0 bsp=e00002343bdb1298
    [<a000000100013ab0>] show_regs+0x7d0/0x800
    sp=e00002343bdb7ab0 bsp=e00002343bdb1248
    [<a000000100036970>] die+0x210/0x320
    sp=e00002343bdb7ab0 bsp=e00002343bdb1200
    [<a00000010005a800>] ia64_do_page_fault+0x900/0xa80
    sp=e00002343bdb7ad0 bsp=e00002343bdb1198
    [<a00000010000bbc0>] ia64_leave_kernel+0x0/0x290
    sp=e00002343bdb7b80 bsp=e00002343bdb1198
    [<a0000001001f0a50>] sysfs_create_group+0x30/0x2a0
    sp=e00002343bdb7d50 bsp=e00002343bdb1140
    [<a00000010081ad30>] topology_cpu_callback+0x70/0xc0
    sp=e00002343bdb7d60 bsp=e00002343bdb1110
    [<a00000010081ae00>] topology_sysfs_init+0x80/0x120
    sp=e00002343bdb7d60 bsp=e00002343bdb10f0
    [<a000000100009860>] init+0x580/0x8e0
    sp=e00002343bdb7d60 bsp=e00002343bdb10c8
    [<a000000100011740>] kernel_thread_helper+0xe0/0x100
    sp=e00002343bdb7e30 bsp=e00002343bdb10a0
    [<a000000100009140>] start_kernel_thread+0x20/0x40
    sp=e00002343bdb7e30 bsp=e00002343bdb10a0
    <0>Kernel panic - not syncing: Attempted to kill init!


    --
    I won't rest till it's the best ...
    Programmer, Linux Scalability
    Paul Jackson <pj@sgi.com> 1.925.600.0401
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