http://bugme.osdl.org/show_bug.cgi?id=3503
Summary: EIP in d_splice_alias with 2.6.8.1 #1 SMP
Kernel Version: 2.6.8.1
Status: NEW
Severity: normal
Owner: xfs-masters@xxxxxxxxxxx
Submitter: ralf.hildebrandt@xxxxxxxxxx
Distribution: Debian/testing
Hardware Environment: Intel P4/Xeon 2.8 GHz, 2 GB RAM
Software Environment: 2.6.8.1 #1 SMP
Problem Description: EIP in d_splice_alias with 2.6.8.1 #1 SMP
Today, our squid proxy server wasn't processing ICP requests anymore.
After checking the box I found squid running and the network
interfaces to be up - I was able to login remotely using ssh.
Nevertheless squid wasn't working as usual, e.g. I couldn't connect to
it.
dmesg showed an EIP (see below). After a reboot, normal operation
were restore immediately
Oct 3 06:30:02 spiderboy squid[894]: CACHEMGR: <unknown>@127.0.0.1 requesting
'store_io'
Oct 3 06:30:54 spiderboy kernel: Unable to handle kernel NULL pointer
dereference at virtual address 00000040
Oct 3 06:30:54 spiderboy kernel: printing eip:
Oct 3 06:30:54 spiderboy kernel: c015f684
Oct 3 06:30:54 spiderboy kernel: *pde = 00000000
Oct 3 06:30:54 spiderboy kernel: Oops: 0000 [#1]
Oct 3 06:30:54 spiderboy kernel: SMP
Oct 3 06:30:54 spiderboy kernel: Modules linked in: psmouse ipt_state
iptable_filter ip_tables ip_conntrack_ftp ip_conntrack tg3 rtc
Oct 3 06:30:54 spiderboy kernel: CPU: 0
Oct 3 06:30:54 spiderboy kernel: EIP: 0060:[d_splice_alias+28/205] Not
tainted
Oct 3 06:30:54 spiderboy kernel: EFLAGS: 00010202 (2.6.8.1)
Oct 3 06:30:54 spiderboy kernel: EIP is at d_splice_alias+0x1c/0xcd
Oct 3 06:30:54 spiderboy kernel: eax: 00000020 ebx: 00000020 ecx:
d9ac3d20 edx: da14ecb0
Oct 3 06:30:54 spiderboy kernel: esi: da14ecb0 edi: 00000020 ebp:
00000000 esp: d5696e44
Oct 3 06:30:54 spiderboy kernel: ds: 007b es: 007b ss: 0068
Oct 3 06:30:54 spiderboy kernel: Process find (pid: 10743,
threadinfo=d5696000 task=efffc1b0)
Oct 3 06:30:54 spiderboy kernel: Stack: c03506e0 da14ecb0 00000020 efd79820
c01f76e5 00000000 00000000 00000000
Oct 3 06:30:54 spiderboy kernel: 00000000 c0350a80 fffffff4 efd7988c
c0155f33 da14ecb0 d5696f1c d5696ed4
Oct 3 06:30:54 spiderboy kernel: 00000000 d5696f1c d5696ecc d5696ed4
c0156175 f7fc3a00 d5696ed4 00000000
Oct 3 06:30:54 spiderboy kernel: Call Trace:
Oct 3 06:30:54 spiderboy kernel: [linvfs_lookup+115/141]
linvfs_lookup+0x73/0x8d
Oct 3 06:30:54 spiderboy kernel: [real_lookup+186/219] real_lookup+0xba/0xdb
Oct 3 06:30:54 spiderboy kernel: [do_lookup+126/137] do_lookup+0x7e/0x89
Oct 3 06:30:54 spiderboy kernel: [link_path_walk+1683/3361]
link_path_walk+0x693/0xd21
Oct 3 06:30:54 spiderboy kernel: [copy_to_user+50/69] copy_to_user+0x32/0x45
Oct 3 06:30:54 spiderboy kernel: [path_lookup+145/334]
path_lookup+0x91/0x14e
Oct 3 06:30:54 spiderboy kernel: [__user_walk+68/84] __user_walk+0x44/0x54
Oct 3 06:30:54 spiderboy kernel: [vfs_lstat+26/75] vfs_lstat+0x1a/0x4b
Oct 3 06:30:54 spiderboy kernel: [sys_lstat64+18/43] sys_lstat64+0x12/0x2b
Oct 3 06:30:54 spiderboy kernel: [syscall_call+7/11] syscall_call+0x7/0xb
Oct 3 06:30:54 spiderboy kernel: Code: 0f b7 40 20 25 00 f0 00 00 3d 00 40 00
00 74 25 89 da 89 f0
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