Re: 2.6.9rc2-mm4 oops

From: Andrew Morton (akpm_at_osdl.org)
Date: 09/30/04

  • Next message: Paul Fulghum: "Re: Serial driver hangs" 
    Date:	Thu, 30 Sep 2004 12:49:37 -0700
To: Fernando Pablo Lopez-Lezcano <nando@ccrma.Stanford.EDU>

    Fernando Pablo Lopez-Lezcano <nando@ccrma.Stanford.EDU> wrote:
    >
    > I ran into this while testing the voluntary preemption S7 patch. It
    > still happens in vanilla 2.6.9rc2-mm4 (with the small patch below that
    > Ingo sent me, otherwise plain rc2-mm4 would not boot). The machine is an
    > athlon64 based workstation and has no floppy drive:

    Thanks. Whenever I see floppy+acpi+oops, I think "Bjorn!".

    > inserting floppy driver for 2.6.8.1-1.520.1nov.rhfc2.ccrma
    > Unable to handle kernel paging request at virtual address f8881920
    > printing eip:
    > c0251d3d
    > *pde = 37f5f067
    > Oops: 0002 [#1]
    > PREEMPT
    > Modules linked in: floppy(U) sg(U) dm_mod(U) uhci_hcd(U) ehci_hcd(U)
    > button(U) battery(U) asus_acpi(U) ac(U) ext3(U) jbd(U) raid5(U) xor(U)
    > sata_via(U) sata_promise(U) libata(U) sd_mod(U) scsi_mod(U)
    > CPU: 0
    > EIP: 0060:[<c0251d3d>] Not tainted VLI
    > EFLAGS: 00010246 (2.6.8.1-1.520.1nov.rhfc2.ccrma)
    > EIP is at acpi_bus_register_driver+0xd2/0x165
    > eax: f8881920 ebx: f88eefe0 ecx: c03d6b40 edx: f88ebd30
    > esi: ffffffed edi: f6ed4000 ebp: c03d9460 esp: f6ed4f5c
    > ds: 007b es: 007b ss: 0068
    > Process modprobe (pid: 2119, threadinfo=f6ed4000 task=f6e71870)
    > Stack: c03d94a0 f88e9126 00000015 00000014 f8870bc1 c03d94a0 f88ef280
    > f6ed4000
    > c0129ef7 c03d94a0 f88ef280 f6ed4000 c03d9460 c014dd52 00000246
    > f62f29ac
    > f6e1fc40 f6d8b8ac f6de4380 f6de43ac 00000000 b7fde008 0807a1a0
    > 006a809d
    > Call Trace:
    > [<f88e9126>] acpi_floppy_init+0x16/0x50 [floppy]
    > [<f8870bc1>] floppy_init+0x11/0x600 [floppy]
    > [<c0129ef7>] printk+0x17/0x20
    > [<c014dd52>] sys_init_module+0x252/0x3b0
    > [<c0106afd>] sysenter_past_esp+0x52/0x71
    > Code: 00 00 00 a1 ec 67 3e c0 c7 05 78 67 3e c0 a0 7b 3a c0 c7 05 7c 67
    > 3e c0 bd 01 00 00 89 1d ec 67 3e c0 c7 03 e8 67 3e c0 89 43 04 <89> 18
    > 81 3d 68 67 3e c0 3c 4b 24 1d 74 1c 68 68 67 3e c0 68 bf
    > <6>note: modprobe[2119] exited with preempt_count 1
    > Debug: sleeping function called from invalid context at
    > include/linux/rwsem.h:43
    > in_atomic():1, irqs_disabled():0
    > [<c0125652>] __might_sleep+0xa2/0xb0
    > [<c012d222>] do_exit+0xa2/0x980
    > [<c010775f>] die+0x2bf/0x2c0
    > [<c012a0b6>] vprintk+0x1b6/0x340
    > [<c011e1e4>] do_page_fault+0x314/0x56c
    > [<c01d8155>] sysfs_new_dirent+0x25/0x80
    > [<c01d81cd>] sysfs_make_dirent+0x1d/0x90
    > [<c0172a29>] unmap_area_pmd+0x49/0x60
    > [<c01d7d84>] sysfs_add_file+0x74/0xa0
    > [<c0172bb0>] unmap_vm_area+0x30/0x80
    > [<c0173136>] __vunmap+0xb6/0xf0
    > [<c0129cf0>] call_console_drivers+0x80/0x110
    > [<c011ded0>] do_page_fault+0x0/0x56c
    > [<c0106cf9>] error_code+0x2d/0x38
    > [<c0251d3d>] acpi_bus_register_driver+0xd2/0x165
    > [<f88e9126>] acpi_floppy_init+0x16/0x50 [floppy]
    > [<f8870bc1>] floppy_init+0x11/0x600 [floppy]
    > [<c0129ef7>] printk+0x17/0x20
    > [<c014dd52>] sys_init_module+0x252/0x3b0
    > [<c0106afd>] sysenter_past_esp+0x52/0x71
    > ohci1394: $Rev: 1226 $ Ben Collins <bcollins@debian.org>
    >
    > -- Fernando
    >
    > --- linux/init/main.c.orig
    > +++ linux/init/main.c
    > @@ -435,6 +435,12 @@ static void noinline rest_init(void)
    > {
    > kernel_thread(init, NULL, CLONE_FS | CLONE_SIGHAND);
    > numa_default_policy();
    > + /*
    > + * Re-enable preemption but disable interrupts to make sure
    > + * we dont get preempted until we schedule() in cpu_idle().
    > + */
    > + local_irq_disable();
    > + preempt_enable_no_resched();
    > unlock_kernel();
    > cpu_idle();
    > }
    > @@ -501,6 +507,7 @@ asmlinkage void __init start_kernel(void
    > * time - but meanwhile we still have a functioning scheduler.
    > */
    > sched_init();
    > + preempt_disable();
    > build_all_zonelists();
    > page_alloc_init();
    > trap_init();
    > --- linux/arch/i386/kernel/entry.S.orig
    > +++ linux/arch/i386/kernel/entry.S
    > @@ -197,10 +197,8 @@ need_resched:
    > jz restore_all
    > testl $IF_MASK,EFLAGS(%esp) # interrupts off (exception
    > path) ?
    > jz restore_all
    > - movl $PREEMPT_ACTIVE,TI_preempt_count(%ebp)
    > sti
    > - call schedule
    > - movl $0,TI_preempt_count(%ebp)
    > + call preempt_schedule
    > cli
    > jmp need_resched
    > #endif
    -
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  • Next message: Paul Fulghum: "Re: Serial driver hangs"