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    SubjectEeek! page_mapcount(page) went negative! (-1)

    Running a script called thumbnails, which uses imagemagick's convert
    utility, I got this on a mainline 2.6.16.38:

    Feb 4 17:04:01 prato /USR/SBIN/CRON[17173]: (tna) CMD (thumbnails
    /db2/2006/2006-11/2006-11-16)

    Feb 4 17:20:49 prato kernel: swap_free: Unused swap offset entry 00000080
    Feb 4 17:20:49 prato kernel: convert[23078]: segfault at
    0000000000008000 rip 00002b885c7d6590 rsp 00007fffffa49308 error 4
    Feb 4 17:20:50 prato kernel: convert[23113]: segfault at
    0000000000008010 rip 00002b0914f305aa rsp 00007fffff984340 error 4

    Feb 4 17:50:57 prato kernel: swap_free: Unused swap offset entry 00000080
    Feb 4 17:50:57 prato kernel: swap_free: Unused swap offset entry 00000080
    Feb 4 17:50:57 prato kernel: Eeek! page_mapcount(page) went negative! (-1)
    Feb 4 17:50:57 prato kernel: page->flags = 10000000000083c
    Feb 4 17:50:57 prato kernel: page->count = 2
    Feb 4 17:50:57 prato kernel: page->mapping = ffff81002604c670
    Feb 4 17:50:57 prato kernel: ----------- [cut here ] --------- [please
    bite here ] ---------
    Feb 4 17:50:57 prato kernel: Kernel BUG at mm/rmap.c:560
    Feb 4 17:50:57 prato kernel: invalid opcode: 0000 [1] SMP
    Feb 4 17:50:57 prato kernel: CPU 1
    Feb 4 17:50:57 prato kernel: Modules linked in: lirc_serial lirc_dev
    saa7134_alsa tuner saa7134 video_buf compat_ioctl32 v4l2_common v4l1_compat
    ir_kbd_i2c ir_common videodev skge ehci_hcd ohci_hcd psmouse pcspkr evdev
    Feb 4 17:50:57 prato kernel: Pid: 29168, comm: thumbnails Tainted:
    GF 2.6.16.38 #1
    Feb 4 17:50:57 prato kernel: RIP: 0010:[<ffffffff801581f0>]
    <ffffffff801581f0>{page_remove_rmap+117}
    Feb 4 17:50:57 prato kernel: RSP: 0018:ffff81000bc6dde8 EFLAGS: 00010286
    Feb 4 17:50:57 prato kernel: RAX: 00000000ffffffff RBX:
    ffff810001d1b290 RCX: 0000000000006507
    Feb 4 17:50:57 prato kernel: RDX: 00000000ffffff01 RSI:
    0000000000000292 RDI: ffffffff80465dfc
    Feb 4 17:50:57 prato kernel: RBP: 000000003be9e000 R08:
    0000000000000000 R09: 0000000000000001
    Feb 4 17:50:57 prato kernel: R10: 0000000000000010 R11:
    0000000000000000 R12: 000000000062f000
    Feb 4 17:50:57 prato kernel: R13: ffff810015ed7178 R14:
    00000000006d6000 R15: ffff810001e12220
    Feb 4 17:50:57 prato kernel: FS: 00002b444df8a6d0(0000)
    GS:ffff810001fc5ac0(0000) knlGS:0000000000000000
    Feb 4 17:50:57 prato kernel: CS: 0010 DS: 0000 ES: 0000 CR0:
    000000008005003b
    Feb 4 17:50:57 prato kernel: CR2: 00002b444ddb61f0 CR3:
    0000000013f22000 CR4: 00000000000006e0
    Feb 4 17:50:57 prato kernel: Process thumbnails (pid: 29168, threadinfo
    ffff81000bc6c000, task ffff81003fe25160)
    Feb 4 17:50:57 prato kernel: Stack: ffff810001d1b290 ffffffff801519da
    0000000000000000 ffff81000bc6dec8
    Feb 4 17:50:57 prato kernel: ffffffffffffffff 0000000000000000
    ffff81002955d648 ffff81000bc6ded0
    Feb 4 17:50:57 prato kernel: 0000000000000000 000000012cf477b8
    Feb 4 17:50:57 prato kernel: Call Trace:
    <ffffffff801519da>{unmap_vmas+1012} <ffffffff80154a7d>{exit_mmap+120}
    Feb 4 17:50:57 prato kernel: <ffffffff80126c7d>{mmput+40}
    <ffffffff8012bb38>{do_exit+489}
    Feb 4 17:50:57 prato kernel:
    <ffffffff8012c217>{sys_exit_group+0} <ffffffff8010a936>{system_call+126}
    Feb 4 17:50:57 prato kernel:
    Feb 4 17:50:57 prato kernel: Code: 0f 0b 68 f8 21 40 80 c2 30 02 5b 48
    83 ce ff bf 20 00 00 00
    Feb 4 17:50:57 prato kernel: RIP
    <ffffffff801581f0>{page_remove_rmap+117} RSP <ffff81000bc6dde8>
    Feb 4 17:50:57 prato kernel: <1>Fixing recursive fault but reboot is
    needed!
    Feb 4 17:52:52 prato kernel: Bad page state in process 'kswapd0'
    Feb 4 17:52:52 prato kernel: page:ffff810001d1b290
    flags:0x0100000000000008 mapping:0000000000000000 mapcount:-1 count:0
    Feb 4 17:52:52 prato kernel: Trying to fix it up, but a reboot is needed
    Feb 4 17:52:52 prato kernel: Backtrace:
    Feb 4 17:52:52 prato kernel:
    Feb 4 17:52:52 prato kernel: Call Trace:
    <ffffffff80149d38>{bad_page+80} <ffffffff8014a0f3>{free_hot_cold_page+116}
    Feb 4 17:52:52 prato kernel:
    <ffffffff8014a19a>{__pagevec_free+33}
    <ffffffff8014cfc6>{__pagevec_release_nonlru+122}
    Feb 4 17:52:52 prato kernel:
    <ffffffff8014e341>{shrink_zone+2280} <ffffffff8014ec9d>{balance_pgdat+527}
    Feb 4 17:52:52 prato kernel: <ffffffff8014f21c>{kswapd+265}
    <ffffffff8013ae86>{autoremove_wake_function+0}
    Feb 4 17:52:52 prato kernel: <ffffffff8010b782>{child_rip+8}
    <ffffffff8014f113>{kswapd+0}
    Feb 4 17:52:52 prato kernel: <ffffffff8010b77a>{child_rip+0}

    lspci

    00:00.0 Host bridge: nVidia Corporation nForce3 250Gb Host Bridge (rev a1)
    00:01.0 ISA bridge: nVidia Corporation nForce3 250Gb LPC Bridge (rev a2)
    00:01.1 SMBus: nVidia Corporation nForce 250Gb PCI System Management
    (rev a1)
    00:02.0 USB Controller: nVidia Corporation CK8S USB Controller (rev a1)
    00:02.1 USB Controller: nVidia Corporation CK8S USB Controller (rev a1)
    00:02.2 USB Controller: nVidia Corporation nForce3 EHCI USB 2.0
    Controller (rev a2)
    00:06.0 Multimedia audio controller: nVidia Corporation nForce3 250Gb
    AC'97 Audio Controller (rev a1)
    00:08.0 IDE interface: nVidia Corporation CK8S Parallel ATA Controller
    (v2.5) (rev a2)
    00:0a.0 IDE interface: nVidia Corporation CK8S Serial ATA Controller
    (v2.5) (rev a2)
    00:0b.0 PCI bridge: nVidia Corporation nForce3 250Gb AGP Host to PCI
    Bridge (rev a2)
    00:0e.0 PCI bridge: nVidia Corporation nForce3 250Gb PCI-to-PCI Bridge
    (rev a2)
    00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
    HyperTransport Technology Configuration
    00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
    Address Map
    00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
    DRAM Controller
    00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
    Miscellaneous Control
    01:00.0 VGA compatible controller: nVidia Corporation NV18 [GeForce4 MX
    4000 AGP 8x] (rev c1)
    02:06.0 Multimedia controller: Philips Semiconductors SAA7133/SAA7135
    Video Broadcast Decoder (rev 10)
    02:07.0 Multimedia controller: Philips Semiconductors SAA7133/SAA7135
    Video Broadcast Decoder (rev 10)
    02:08.0 Multimedia controller: Philips Semiconductors SAA7133/SAA7135
    Video Broadcast Decoder (rev 10)
    02:09.0 Multimedia controller: Philips Semiconductors SAA7133/SAA7135
    Video Broadcast Decoder (rev 10)
    02:0a.0 Multimedia controller: Philips Semiconductors SAA7133/SAA7135
    Video Broadcast Decoder (rev 10)
    02:0b.0 Ethernet controller: Marvell Technology Group Ltd. 88E8001
    Gigabit Ethernet Controller (rev 13)

    Let me know if more information would be useful, such as the kernel
    .config file.

    Dave


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