Kernel seems to crash reliably when I overwrite a file directly (not in the
merged tree), which is in use in the merged tree. This has happened in
debian 2.6.32-5, and 2.6.38-2 using the stock debian aufs build. I'm a
complete noob when it comes to nix mailing lists, so if this is more of a
kernel issue, feel free to send me on my way.
For example,
1. mount none ./merged -t aufs -o br=./temp1:./temp2
2. start an app using a file in merged/
3. copy over that same file in temp1
4. cp segfaults, and the kernel crashes:
Apr 24 19:11:28 game kernel: [216328.757709] aufs test_add:248:mount[14865]:
uid/gid/perm stock 1000/111/0755, 1014/1015/0755
Apr 24 19:11:48 game kernel: [216348.911505] aufs test_add:248:mount[14991]:
uid/gid/perm stock 1000/111/0755, 1014/1015/0755
Apr 24 19:12:54 game kernel: [216414.951053] CPU 2
Apr 24 19:12:54 game kernel: [216414.951084] Modules linked in: sg sr_mod
cdrom joydev usbhid usb_storage hid aufs(C) iptable_filter ip_tables
x_tables firewire_sbp2 loop snd_hda_codec_realtek snd_hda_intel
snd_hda_codec snd_hwdep snd_pcm snd_timer i915 drm_kms_helper i2c_i801 snd
soundcore snd_page_alloc drm i2c_algo_bit i2c_core video output pcspkr
psmouse evdev serio_raw processor button ext3 jbd mbcache sd_mod crc_t10dif
uhci_hcd firewire_ohci firewire_core r8169 thermal ata_generic thermal_sys
ata_piix crc_itu_t mii ehci_hcd pata_jmicron libata usbcore scsi_mod
nls_base e1000e [last unloaded: scsi_wait_scan]
Apr 24 19:12:54 game kernel: [216414.951481] Pid: 14476, comm: sftp-server
Tainted: G C 2.6.32-5-amd64 #1
Apr 24 19:12:54 game kernel: [216414.951551] RIP: 0010:[<ffffffff810b5964>]
[<ffffffff810b5964>] __remove_from_page_cache+0x51/0xb6
Apr 24 19:12:54 game kernel: [216414.951631] RSP: 0018:ffff8800aaab5b28
EFLAGS: 00010046
Apr 24 19:12:54 game kernel: [216414.951671] RAX: 0000000000000000 RBX:
ffffea00072f0330 RCX: ffff8802192d5a2a
Apr 24 19:12:54 game kernel: [216414.951737] RDX: 00000000fffffff8 RSI:
0000000000000009 RDI: ffff880000013d00
Apr 24 19:12:54 game kernel: [216414.951805] RBP: ffff8802192bdb30 R08:
0000000000000009 R09: ffff88022f056300
Apr 24 19:12:54 game kernel: [216414.951872] R10: 0000000000000040 R11:
ffff8802192d5c58 R12: ffff8802192bdb30
Apr 24 19:12:54 game kernel: [216414.951940] R13: 0000000000000007 R14:
ffff8800aaab5c00 R15: 0000000000000000
Apr 24 19:12:54 game kernel: [216414.952005] FS: 00007fb496f97700(0000)
GS:ffff880008d00000(0000) knlGS:0000000000000000
Apr 24 19:12:54 game kernel: [216414.952075] CS: 0010 DS: 0000 ES: 0000
CR0: 0000000080050033
Apr 24 19:12:54 game kernel: [216414.952118] CR2: 00007f6499f37000 CR3:
000000022e1dd000 CR4: 00000000000406e0
Apr 24 19:12:54 game kernel: [216414.952185] DR0: 0000000000000000 DR1:
0000000000000000 DR2: 0000000000000000
Apr 24 19:12:54 game kernel: [216414.952253] DR3: 0000000000000000 DR6:
00000000ffff0ff0 DR7: 0000000000000400
Apr 24 19:12:54 game kernel: [216414.952319] Process sftp-server (pid:
14476, threadinfo ffff8800aaab4000, task ffff8800b17d7100)
Apr 24 19:12:54 game kernel: [216414.952423] ffff8800b00d7690
ffff8802192bdb48 ffffea00072f0330 ffffffff810b59f2
Apr 24 19:12:54 game kernel: [216414.952473] <0> ffffea00072f0330
ffff8802192bdb30 0000000000000007 ffffffff810bcf0a
Apr 24 19:12:54 game kernel: [216414.952546] <0> 0000000000000000
ffffea00072f0330 0000000000000007 ffffffff810bcfcb
Apr 24 19:12:54 game kernel: [216414.952678] [<ffffffff810b59f2>] ?
remove_from_page_cache+0x29/0x3b
Apr 24 19:12:54 game kernel: [216414.952724] [<ffffffff810bcf0a>] ?
truncate_inode_page+0x6d/0x84
Apr 24 19:12:54 game kernel: [216414.952768] [<ffffffff810bcfcb>] ?
truncate_inode_pages_range+0xaa/0x2b0
Apr 24 19:12:54 game kernel: [216414.952813] [<ffffffff810bd20d>] ?
truncate_pagecache+0x33/0x4a
Apr 24 19:12:54 game kernel: [216414.952857] [<ffffffff810bd24d>] ?
vmtruncate+0x29/0x46
Apr 24 19:12:54 game kernel: [216414.952898] [<ffffffff8110101f>] ?
inode_setattr+0x22/0x10a
Apr 24 19:12:54 game kernel: [216414.952943] [<ffffffffa01174da>] ?
ext3_setattr+0x17b/0x1c9 [ext3]
Apr 24 19:12:54 game kernel: [216414.952982] [<ffffffff81101287>] ?
notify_change+0x180/0x2c5
Apr 24 19:12:54 game kernel: [216414.953015] [<ffffffff810ede40>] ?
do_truncate+0x63/0x7e
Apr 24 19:12:54 game kernel: [216414.953048] [<ffffffff810f60e8>] ?
get_write_access+0x18/0x4b
Apr 24 19:12:54 game kernel: [216414.953081] [<ffffffff810f82e7>] ?
may_open+0x191/0x1c8
Apr 24 19:12:54 game kernel: [216414.953116] [<ffffffff810f8bca>] ?
do_filp_open+0x4bf/0x94b
Apr 24 19:12:54 game kernel: [216414.953149] [<ffffffff810f1dcb>] ?
cp_new_stat+0xe9/0xfc
Apr 24 19:12:54 game kernel: [216414.953182] [<ffffffff810ed11f>] ?
do_sys_open+0x55/0xfc
Apr 24 19:12:54 game kernel: [216414.953213] [<ffffffff81010b42>] ?
system_call_fastpath+0x16/0x1b
Apr 24 19:12:54 game kernel: [216414.953438] RSP <ffff8800aaab5b28>
Apr 24 19:12:54 game kernel: [216414.953619] ---[ end trace a62e181230481d17
]---
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