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    SubjectRe: -mm merge plans for 2.6.20
    On Tue, Dec 05, 2006 at 11:02:50AM -0500, Dave Jones wrote:
    > On Mon, Dec 04, 2006 at 08:40:24PM -0800, Andrew Morton wrote:
    >
    > > cpufreq-fix-bug-in-duplicate-freq-elimination-code-in-acpi-cpufreq.patch
    > > remove-hotplug-cpu-crap-from-cpufreq.patch
    > > cpufreq-select-consistently-re-2619-rc5-mm1.patch
    > > cpufreq-set-policy-curfreq-on-initialization.patch
    > > bug-fix-for-acpi-cpufreq-and-cpufreq_stats-oops-on-frequency-change-notification.patch
    > >
    > > Sent to cpufreq maintainer
    >
    > I'm travelling right now, and somehow managed to oops my home router
    > 3000 miles away making it hard for me to access mail & stuff.
    > (That "page count went negative" BUG() bit me when I did a killall -9 vpnc)

    Finally managed to fish this out of the logs..


    Eeek! page_mapcount(page) went negative! (-2)
    page->flags = 404
    page->count = 1
    page->mapping = 00000000
    ------------[ cut here ]------------
    kernel BUG at mm/rmap.c:587!
    invalid opcode: 0000 [#2]
    SMP
    last sysfs file: /class/net/lo/type
    Modules linked in: tun ipt_MASQUERADE iptable_nat ip_nat ipt_LOG xt_limit ipv6 ip_conntrack_netbios_ns ipt_REJECT xt_state ip_conntrack nfnetlink xt_tcpudp iptable_filter ip_tables x_tables video sbs i2c_ec button battery asus_acpi ac parport_pc lp parport pcspkr ide_cd i2c_viapro i2c_core cdrom 3c59x via_rhine via_ircc mii irda crc_ccitt serio_raw dm_snapshot dm_zero dm_mirror dm_mod ext3 jbd ehci_hcd ohci_hcd uhci_hcd
    CPU: 0
    EIP: 0060:[<c046396c>] Not tainted VLI
    EFLAGS: 00010246 (2.6.18-1.2849.fc6 #1)
    EIP is at page_remove_rmap+0x8b/0xac
    eax: 00000000 ebx: c1000000 ecx: ffffffff edx: 00000046
    esi: dcaa2f98 edi: 00000020 ebp: cd3f7f00 esp: cd3e4ddc
    ds: 007b es: 007b ss: 0068
    Process vpnc (pid: 3367, ti=cd3e4000 task=cd3a0b50 task.ti=cd3e4000)
    Stack: c0638bad 00000000 c1000000 09bc0000 c045e199 00000000 dcaa2f98 cd3e4e54
    003ebff8 00000000 00000001 09bdb000 cd377098 c1624a80 c13e5f60 fffffffa
    ffffffff c1624ad4 cd377098 09bdb000 00000000 cd3e4e54 c1485d4c c1624a80
    Call Trace:
    [<c045e199>] unmap_vmas+0x28e/0x504
    [<c0460c0f>] exit_mmap+0x77/0xf1
    [<c0422d75>] mmput+0x34/0x7a
    [<c0427818>] do_exit+0x20b/0x776
    [<c0427df9>] sys_exit_group+0x0/0xd
    [<cd39a644>] 0xcd39a644
    DWARF2 unwinder stuck at 0xcd39a644
    Leftover inexact backtrace:
    [<c0615375>] do_page_fault+0x0/0x4db
    [<c0430828>] get_signal_to_deliver+0x38b/0x3b3
    [<c04068d1>] do_IRQ+0xb0/0xbc
    [<c0615375>] do_page_fault+0x0/0x4db
    [<c0403626>] do_notify_resume+0x7e/0x6c1
    [<c045f135>] __handle_mm_fault+0x82c/0x860
    [<c04068d1>] do_IRQ+0xb0/0xbc
    [<c061455e>] _spin_unlock_irq+0x5/0x7
    [<c0612ccc>] schedule+0x960/0x9dd
    [<c0615375>] do_page_fault+0x0/0x4db
    [<c04040a2>] work_notifysig+0x13/0x19
    =======================
    Code: 82 1e fc ff 8b 43 10 c7 04 24 ad 8b 63 c0 89 44 24 04 e8 6f 1e fc ff 8b 46 40 85 c0 74 0d 8b 50 08 b8 c6 8b 63 c0 e8 07 ce fd ff <0f> 0b 4b 02 42 8b 63 c0 8b 53 10 89 d8 59 5b 5b 5e 83 f2 01 83
    EIP: [<c046396c>] page_remove_rmap+0x8b/0xac SS:ESP 0068:cd3e4ddc
    <3>BUG: sleeping function called from invalid context at kernel/rwsem.c:20
    in_atomic():1, irqs_disabled():0
    [<c04051db>] dump_trace+0x69/0x1af
    [<c0405339>] show_trace_log_lvl+0x18/0x2c
    [<c04058ed>] show_trace+0xf/0x11
    [<c04059ea>] dump_stack+0x15/0x17
    [<c04394a2>] down_read+0x12/0x20
    [<c0431601>] blocking_notifier_call_chain+0xe/0x29
    [<c0427628>] do_exit+0x1b/0x776
    [<c040588e>] die+0x29d/0x2c2
    [<c0405fd3>] do_invalid_op+0xa2/0xab
    [<c0404b85>] error_code+0x39/0x40
    DWARF2 unwinder stuck at error_code+0x39/0x40
    Leftover inexact backtrace:
    [<c046396c>] page_remove_rmap+0x8b/0xac
    [<c045e199>] unmap_vmas+0x28e/0x504
    [<c0460c0f>] exit_mmap+0x77/0xf1
    [<c0422d75>] mmput+0x34/0x7a
    [<c0427818>] do_exit+0x20b/0x776
    [<c042f153>] __dequeue_signal+0x151/0x15c
    [<c0615375>] do_page_fault+0x0/0x4db
    [<c0427df9>] sys_exit_group+0x0/0xd
    [<c0615375>] do_page_fault+0x0/0x4db
    [<c0430828>] get_signal_to_deliver+0x38b/0x3b3
    [<c04068d1>] do_IRQ+0xb0/0xbc
    [<c0615375>] do_page_fault+0x0/0x4db
    [<c0403626>] do_notify_resume+0x7e/0x6c1
    [<c045f135>] __handle_mm_fault+0x82c/0x860
    [<c04068d1>] do_IRQ+0xb0/0xbc
    [<c061455e>] _spin_unlock_irq+0x5/0x7
    [<c0612ccc>] schedule+0x960/0x9dd
    [<c0615375>] do_page_fault+0x0/0x4db
    [<c04040a2>] work_notifysig+0x13/0x19
    =======================
    Fixing recursive fault but reboot is needed!
    BUG: scheduling while atomic: vpnc/0x00000001/3367
    [<c04051db>] dump_trace+0x69/0x1af
    [<c0405339>] show_trace_log_lvl+0x18/0x2c
    [<c04058ed>] show_trace+0xf/0x11
    [<c04059ea>] dump_stack+0x15/0x17
    [<c06123af>] schedule+0x43/0x9dd
    [<c04276f7>] do_exit+0xea/0x776
    [<c040588e>] die+0x29d/0x2c2
    [<c0405fd3>] do_invalid_op+0xa2/0xab
    [<c0404b85>] error_code+0x39/0x40
    DWARF2 unwinder stuck at error_code+0x39/0x40
    Leftover inexact backtrace:
    [<c046396c>] page_remove_rmap+0x8b/0xac
    [<c045e199>] unmap_vmas+0x28e/0x504
    [<c0460c0f>] exit_mmap+0x77/0xf1
    [<c0422d75>] mmput+0x34/0x7a
    [<c0427818>] do_exit+0x20b/0x776
    [<c042f153>] __dequeue_signal+0x151/0x15c
    [<c0615375>] do_page_fault+0x0/0x4db
    [<c0427df9>] sys_exit_group+0x0/0xd
    [<c0615375>] do_page_fault+0x0/0x4db
    [<c0430828>] get_signal_to_deliver+0x38b/0x3b3
    [<c04068d1>] do_IRQ+0xb0/0xbc
    [<c0615375>] do_page_fault+0x0/0x4db
    [<c0403626>] do_notify_resume+0x7e/0x6c1
    [<c045f135>] __handle_mm_fault+0x82c/0x860
    [<c04068d1>] do_IRQ+0xb0/0xbc
    [<c061455e>] _spin_unlock_irq+0x5/0x7
    [<c0612ccc>] schedule+0x960/0x9dd
    [<c0615375>] do_page_fault+0x0/0x4db
    [<c04040a2>] work_notifysig+0x13/0x19
    =======================


    That was from a 2.6.18.3 kernel iirc.

    Dave

    --
    http://www.codemonkey.org.uk
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