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    SubjectRe: [BUG] linux-next: Tree for April 9 warning on CC_STACKPROTECTOR, followed by kernel panic
    CC to Ingo ...

    On Thu, 10 Apr 2008 15:09:17 +0530 Kamalesh Babulal <kamalesh@linux.vnet.ibm.com> wrote:
    >
    > Hi Stephen,
    >
    > The next-20080409 kernel warns while booting up on a x86_64 machine.
    > When compiled the kernel with CONFIG_CC_STACKPROTECTOR=y, the warning
    > is followed by the kernel panic.
    >
    > Testing -fstack-protector-all feature
    > No -fstack-protector-stack-frame!
    > -fstack-protector-all test failed
    > ------------[ cut here ]------------
    > WARNING: at kernel/panic.c:365 __stack_chk_test+0x4b/0x50()
    > Modules linked in:
    > Pid: 1, comm: swapper Not tainted 2.6.25-rc8-next-20080409-autotest #1
    >
    > Call Trace:
    > [<ffffffff80231f5e>] warn_on_slowpath+0x51/0x63
    > [<ffffffff80232d93>] printk+0x4e/0x56
    > [<ffffffff80382fcd>] extract_entropy+0x47/0x90
    > [<ffffffff80230000>] dup_mm+0xca/0x3fd
    > [<ffffffff80231eba>] __stack_chk_test_func+0x21/0x32
    > [<ffffffff80231fbb>] __stack_chk_test+0x4b/0x50
    > [<ffffffff808ba8f1>] kernel_init+0x189/0x2f9
    > [<ffffffff804ee221>] _spin_unlock_irq+0x9/0xc
    > [<ffffffff8020cb88>] child_rip+0xa/0x12
    > [<ffffffff808ba768>] kernel_init+0x0/0x2f9
    > [<ffffffff8020cb7e>] child_rip+0x0/0x12
    >
    > ---[ end trace d88d2f3a71e3b32c ]---
    > Freeing unused kernel memory: 368k freed
    > Write protecting the kernel read-only data: 4188k
    > BUG: unable to handle kernel NULL pointer dereference at 00000000000002e8
    > IP: [<ffffffff80286c11>] kmem_cache_alloc+0x19/0x6b
    > PGD 3e925067 PUD 3e924067 PMD 0
    > Oops: 0000 [1] SMP
    > last sysfs file:
    > CPU 0
    > Modules linked in:
    > Pid: 1, comm: init Not tainted 2.6.25-rc8-next-20080409-autotest #1
    > RIP: 0010:[<ffffffff80286c11>] [<ffffffff80286c11>] kmem_cache_alloc+0x19/0x6b
    > RSP: 0000:ffff81003f9c9f08 EFLAGS: 00010046
    > RAX: 0000000000000000 RBX: 0000000000000246 RCX: ffffffff80211f7e
    > RDX: 00007fff1f89e710 RSI: 00000000000000d0 RDI: 0000000000000000
    > RBP: 00007fff1f89e6f8 R08: 000000000065e300 R09: 000000000065e2e8
    > R10: 000000000066d800 R11: 0000000000000203 R12: 00000000000000d0
    > R13: 000000000047c290 R14: 000000000047c250 R15: 0000000000000000
    > FS: 000000000066d870(0063) GS:ffffffff8067a000(0000) knlGS:0000000000000000
    > CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    > CR2: 00000000000002e8 CR3: 000000003e921000 CR4: 00000000000006e0
    > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    > DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    > Process init (pid: 1, threadinfo ffff81003f9c8000, task ffff81003f9c6000)
    > Stack: ffff81003f9c6000 00007fff1f89e6f8 0000000000000002 ffffffff80211f7e
    > ffff81003e920060 ffffffff8033419c ffff81003f9c6000 ffffffff8020d96a
    > 0000000000000000 ffffffff804ee379 0000000000000000 000000000047c250
    > Call Trace:
    > [<ffffffff80211f7e>] ? init_fpu+0x88/0xc9
    > [<ffffffff8033419c>] ? __up_read+0x13/0x8a
    > [<ffffffff8020d96a>] ? math_state_restore+0x19/0x5a
    > [<ffffffff804ee379>] ? error_exit+0x0/0x51
    >
    >
    > Code: 4b 18 31 c0 48 89 f7 fc f3 aa 5b 5d 41 5c 48 89 f0 c3 41 54 41 89 f4 55 53 48 8b 4c 24 18 9c 5b fa 65 8b 04 25 24 00 00 00 48 98 <48> 8b ac c7 e8 02 00 00 48 8b 55 00 48 85 d2 75 10 83 ca ff 49
    > RIP [<ffffffff80286c11>] kmem_cache_alloc+0x19/0x6b
    > RSP <ffff81003f9c9f08>
    > CR2: 00000000000002e8
    > ---[ end trace d88d2f3a71e3b32c ]---
    > Kernel panic - not syncing: Attempted to kill init!
    > Pid: 1, comm: init Tainted: G D 2.6.25-rc8-next-20080409-autotest #1
    >
    > Call Trace:
    > [<ffffffff8023225d>] panic+0x86/0x144
    > [<ffffffff80251911>] kallsyms_lookup+0x49/0x80
    > [<ffffffff80286c11>] kmem_cache_alloc+0x19/0x6b
    > [<ffffffff80232d93>] printk+0x4e/0x56
    > [<ffffffff80232d93>] printk+0x4e/0x56
    > [<ffffffff802351c9>] do_exit+0x71/0x682
    > [<ffffffff804ee731>] oops_begin+0x0/0x8c
    > [<ffffffff804f058d>] do_page_fault+0x738/0x7f3
    > [<ffffffff804ee379>] error_exit+0x0/0x51
    > [<ffffffff80211f7e>] init_fpu+0x88/0xc9
    > [<ffffffff80286c11>] kmem_cache_alloc+0x19/0x6b
    > [<ffffffff80211f7e>] init_fpu+0x88/0xc9
    > [<ffffffff8033419c>] __up_read+0x13/0x8a
    > [<ffffffff8020d96a>] math_state_restore+0x19/0x5a
    > [<ffffffff804ee379>] error_exit+0x0/0x51
    >
    > --
    > Thanks & Regards,
    > Kamalesh Babulal,
    > Linux Technology Center,
    > IBM, ISTL.

    --
    Cheers,
    Stephen Rothwell sfr@canb.auug.org.au
    http://www.canb.auug.org.au/~sfr/
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