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SubjectRe: kernel BUG at mm/truncate.c:475!
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On Tue, 30 Nov 2010, Hugh Dickins wrote:
> On Tue, 30 Nov 2010, Michael Leun wrote:
>
> > happenes sporadically, cannot reproduce at will.
> >
> >
> > Nov 30 15:24:55 elektra kernel: [ 6604.258610] ------------[ cut here ]------------
> > Nov 30 15:24:55 elektra kernel: [ 6604.258628] kernel BUG at mm/truncate.c:475!
> > Nov 30 15:24:55 elektra kernel: [ 6604.258633] invalid opcode: 0000 [#1] PREEMPT SMP
> > Nov 30 15:24:55 elektra kernel: [ 6604.258640] last sysfs file: /sys/devices/system/cpu/cpu3/cache/index2/shared_cpu_map
> > Nov 30 15:24:55 elektra kernel: [ 6604.258646] CPU 3
> > Nov 30 15:24:55 elektra kernel: [ 6604.258649] Modules linked in: veth fuse af_packet bridge 8021q garp stp llc vboxnetadp vboxnetflt vboxdrv nouveau ttm drm_kms_helper drm i2c_algo_bit snd_pcm_oss snd_mixer_oss snd_seq snd_seq_device edd cpufreq_conservative cpufreq_userspace cpufreq_powersave acpi_cpufreq mperf ip6t_REJECT ipt_REJECT ip6t_LOG ipt_LOG xt_limit xt_recent nf_conntrack_ipv6 xt_state xt_tcpudp ip6table_mangle iptable_mangle iptable_nat ip6table_filter ip6_tables iptable_filter nf_nat_ftp nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack_ftp nf_conntrack ip_tables x_tables nls_utf8 loop arc4 ecb snd_hda_codec_nvhdmi iwlagn iwlcore snd_hda_codec_idt snd_hda_intel snd_hda_codec snd_hwdep mac80211 snd_pcm ohci1394 ieee1394 cfg80211 snd_timer sdhci_pci snd sdhci pcmcia firewire_ohci e1000e mmc_core yenta_socket soundcore firewire_core pcmcia_rsrc crc_itu_t pcmcia_core ppdev mcs7830 dm9601 dell_laptop usbnet rfkill snd_page_alloc dell_wmi shpchp sr_mod parport_p!
> c !
> > sg cdrom wmi dcdbas intel_ips parport i
> > Nov 30 15:24:55 elektra kernel: ntel_agp i2c_i801 pci_hotplug iTCO_wdt pcspkr iTCO_vendor_support button video battery ac ext4 jbd2 crc16 sha256_generic aesni_intel cryptd aes_x86_64 aes_generic cbc dm_crypt usbhid linear ehci_hcd usbcore sd_mod dm_snapshot dm_mod fan processor ahci libahci libata scsi_mod thermal thermal_sys
> > Nov 30 15:24:55 elektra kernel: [ 6604.258914]
> > Nov 30 15:24:55 elektra kernel: [ 6604.258918] Pid: 31399, comm: cut Not tainted 2.6.36.1 #2 0N5KHN/Latitude E6510
> > Nov 30 15:24:55 elektra kernel: [ 6604.258924] RIP: 0010:[<ffffffff810ee5e1>] [<ffffffff810ee5e1>] invalidate_inode_pages2_range+0x271/0x350
> > Nov 30 15:24:55 elektra kernel: [ 6604.258939] RSP: 0018:ffff8800774d5b58 EFLAGS: 00010246
> > Nov 30 15:24:55 elektra kernel: [ 6604.258944] RAX: 0000000000000000 RBX: ffffea0001ea2f40 RCX: ffff8800c05a5bd0
> > Nov 30 15:24:55 elektra kernel: [ 6604.258950] RDX: 0000000000000000 RSI: ffff8800774d5a28 RDI: ffff8800c0521a18
> > Nov 30 15:24:55 elektra kernel: [ 6604.258956] RBP: ffff8800774d5c38 R08: ffff8800c05a5bd0 R09: ffff8800774d5ae8
> > Nov 30 15:24:55 elektra kernel: [ 6604.258962] R10: 0000000000000008 R11: 0000000000000001 R12: ffff8800774d5b98
> > Nov 30 15:24:55 elektra kernel: [ 6604.258969] R13: 0000000000000000 R14: ffff8800c05219d8 R15: 0000000000000000
> > Nov 30 15:24:55 elektra kernel: [ 6604.258980] FS: 0000000000000000(0000) GS:ffff880001cc0000(0000) knlGS:0000000000000000
> > Nov 30 15:24:55 elektra kernel: [ 6604.258992] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> > Nov 30 15:24:55 elektra kernel: [ 6604.258999] CR2: 00007f3ad2337290 CR3: 00000000850b3000 CR4: 00000000000006e0
> > Nov 30 15:24:55 elektra kernel: [ 6604.259010] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > Nov 30 15:24:55 elektra kernel: [ 6604.259019] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> > Nov 30 15:24:55 elektra kernel: [ 6604.259028] Process cut (pid: 31399, threadinfo ffff8800774d4000, task ffff8800a2bbae40)
> > Nov 30 15:24:55 elektra kernel: [ 6604.259038] Stack:
> > Nov 30 15:24:55 elektra kernel: [ 6604.259042] ffffffff81074300 ffff8800c05219f0 00000001774d5b60 0000000000000001
> > Nov 30 15:24:55 elektra kernel: [ 6604.259054] <0> ffffffffffffffff 00000000c41fec70 000000000000000e 0000000000000000
> > Nov 30 15:24:55 elektra kernel: [ 6604.259069] <0> ffffea0001ea2f40 ffffea0001a246c8 ffffea0001a24690 ffffea0001a47348
> > Nov 30 15:24:55 elektra kernel: [ 6604.259087] Call Trace:
> > Nov 30 15:24:55 elektra kernel: [ 6604.259094] [<ffffffff81074300>] ? autoremove_wake_function+0x0/0x40
> > Nov 30 15:24:55 elektra kernel: [ 6604.259101] [<ffffffff810ee6d2>] invalidate_inode_pages2+0x12/0x20
> > Nov 30 15:24:55 elektra kernel: [ 6604.259111] [<ffffffffa0848ce0>] fuse_finish_open+0x60/0x70 [fuse]
> > Nov 30 15:24:55 elektra kernel: [ 6604.259118] [<ffffffffa0848d71>] fuse_open_common+0x81/0x90 [fuse]
> > Nov 30 15:24:55 elektra kernel: [ 6604.259125] [<ffffffffa0848d80>] ? fuse_open+0x0/0x10 [fuse]
> > Nov 30 15:24:55 elektra kernel: [ 6604.259132] [<ffffffffa0848d8b>] fuse_open+0xb/0x10 [fuse]
> > Nov 30 15:24:55 elektra kernel: [ 6604.259139] [<ffffffff81137a1a>] __dentry_open+0x11a/0x3c0
> > Nov 30 15:24:55 elektra kernel: [ 6604.259147] [<ffffffff811efbda>] ? security_inode_permission+0x1a/0x20
> > Nov 30 15:24:55 elektra kernel: [ 6604.259154] [<ffffffff81138cc4>] nameidata_to_filp+0x54/0x70
> > Nov 30 15:24:55 elektra kernel: [ 6604.259160] [<ffffffff81147168>] do_last+0x488/0x760
> > Nov 30 15:24:55 elektra kernel: [ 6604.259166] [<ffffffff81147868>] do_filp_open+0x428/0x670
> > Nov 30 15:24:55 elektra kernel: [ 6604.259173] [<ffffffffa0842983>] ? fuse_request_free+0x13/0x20 [fuse]
> > Nov 30 15:24:55 elektra kernel: [ 6604.259181] [<ffffffffa0842a48>] ? fuse_put_request+0xb8/0xc0 [fuse]
> > Nov 30 15:24:55 elektra kernel: [ 6604.259193] [<ffffffff81138d40>] do_sys_open+0x60/0x120
> > Nov 30 15:24:55 elektra kernel: [ 6604.259205] [<ffffffff81138e1b>] sys_open+0x1b/0x20
> > Nov 30 15:24:55 elektra kernel: [ 6604.259217] [<ffffffff81002f02>] system_call_fastpath+0x16/0x1b
> > Nov 30 15:24:55 elektra kernel: [ 6604.259228] Code: fe ff ff 0f 1f 80 00 00 00 00 48 89 c6 31 c9 48 c1 e6 0c ba 00 10 00 00 4c 89 f7 e8 ba 37 01 00 8b 43 0c 85 c0 0f 88 2e ff ff ff <0f> 0b 0f 1f 44 00 00 48 89 df e8 30 39 ff ff 8b 85 50 ff ff ff
> > Nov 30 15:24:55 elektra kernel: [ 6604.259394] RIP [<ffffffff810ee5e1>] invalidate_inode_pages2_range+0x271/0x350
> > Nov 30 15:24:55 elektra kernel: [ 6604.259412] RSP <ffff8800774d5b58>
> > Nov 30 15:24:55 elektra kernel: [ 6604.265642] ---[ end trace 019ef068b5f8e921 ]---
>
> BUG_ON(page_mapped(page)) in invalidate_inode_pages2_range():
> that's interesting, it may relate to another BUG_ON(page_mapped(page))
> that's been reported recently.
>
> This is a 2.6.36.1 kernel you're running: any idea what was the first
> kernel on which you started seeing such errors? and what was the last
> good kernel on which you ran the same kind of load but saw no problems?

The fault handler unlocks the page if vm_ops->page_mkwrite() is
defined. That looks somewhat racy at first glance.

Quick test: does removing the page_mkwrite() callback from fuse make
the problem go away?

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index c822458..a445358 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1328,7 +1328,6 @@ static int fuse_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
static const struct vm_operations_struct fuse_file_vm_ops = {
.close = fuse_vma_close,
.fault = filemap_fault,
- .page_mkwrite = fuse_page_mkwrite,
};

static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma)
Thanks,
Miklos


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