~/linux$ git show 8191ecd1d14c6914c660dfa007154860a7908857
commit 8191ecd1d14c6914c660dfa007154860a7908857
Author: Jens Axboe <[email protected]>
Date: Thu Apr 10 08:24:25 2008 +0200
splice: fix infinite loop in generic_file_splice_read()
linux$ git describe --contains 8191ecd1d14c6914c660dfa007154860a7908857
v2.6.25-rc9~29^2~1
It appears the patch in question was included upstream as of v2.6.25,
thus only the Hardy 8.04 release is affected. Thus, I'm marking the
actively developed linux task as Fix Released. I've opened a Hardy
nomination for this patch to be considered for a Hardy SRU (stable
release update). I'll submit this patch to the mailing list shortly.
Thanks.
** Also affects: linux (Ubuntu Hardy)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Status: Confirmed => Fix Released
** Changed in: linux (Ubuntu Hardy)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Hardy)
Status: New => In Progress
** Changed in: linux (Ubuntu Hardy)
Assignee: (unassigned) => Leann Ogasawara (leannogasawara)
** Description changed:
+ SRU Justification:
+
+ Impact: Without the fix, users can experience "sporadic kernel lockups
+ on a Ubuntu Hardy LTS fileserver which produces serious downtimes."
+
+ Fix: upstream commit 8191ecd1d14c6914c660dfa007154860a7908857
+
+ Test case: Without a patched kernel you'll see soft lockup error
+ messages in your dmesg output an experience sporadic kernel lockups.
+ With a patched kernel you won't experience the lockups or see the error
+ messages.
+
Hello,
we are experiencing sporadic kernel lockups on a Ubuntu Hardy LTS
fileserver which produces serious downtimes. The following message can
be found in our kern.log and dmesg:
May 30 13:55:20 sanhead01 kernel: [699831.819099] BUG: soft lockup - CPU#1
stuck for 11s! [nfsd:17397]
May 30 13:55:20 sanhead01 kernel: [699831.891913] CPU 1:
May 30 13:55:20 sanhead01 kernel: [699831.891914] Modules linked in: nfs nfsd
lockd nfs_acl auth_rpcgss sunrpc exportfs bonding usbkbd qla2xxx raid1 raid10
raid456 async_xor async_memcpy async_tx xor raid0 multipath linear md_mod
dm_mirror dm_snapshot dm_mod fbcon tileblit font bitblit softcursor fan thermal
processor forcedeth tg3 ehci_hcd e1000 ohci_hcd scsi_transport_fc scsi_tgt
pata_amd sata_nv pata_acpi ata_generic libata usbhid hid sd_mod sg scsi_mod
ext3 jbd mbcache shpchp pci_hotplug evdev pcspkr serio_raw button psmouse
i2c_nforce2 i2c_core joydev uhci_hcd usbcore ac video output sbs sbshc
container battery dock bridge 8021q af_packet drbd cn
May 30 13:55:20 sanhead01 kernel: [699831.891952] Pid: 17397, comm: nfsd Not
tainted 2.6.24-26-server #1
May 30 13:55:20 sanhead01 kernel: [699831.891954] RIP:
0010:[find_get_pages_contig+0x95/0xb0] [find_get_pages_contig+0x95/0xb0]
find_get_pages_contig+0x95/0xb0
May 30 13:55:20 sanhead01 kernel: [699831.891959] RSP: 0018:ffff8100cba31a88
EFLAGS: 00000286
May 30 13:55:20 sanhead01 kernel: [699831.891961] RAX: 0000000000000000 RBX:
0000000000000000 RCX: ffff8100cba31c10
May 30 13:55:20 sanhead01 kernel: [699831.891963] RDX: 0000000000000001 RSI:
0000000000000001 RDI: ffff81011da43200
May 30 13:55:20 sanhead01 kernel: [699831.891965] RBP: ffff81001c6914d8 R08:
0000000000000001 R09: 0000000000000000
May 30 13:55:20 sanhead01 kernel: [699831.891967] R10: 0000000000000000 R11:
0000000000000000 R12: 0000000000000014
May 30 13:55:20 sanhead01 kernel: [699831.891970] R13: 0000000000000001 R14:
0000000000000000 R15: ffff81011da43200
May 30 13:55:20 sanhead01 kernel: [699831.891972] FS: 00007f0e957c66e0(0000)
GS:ffff81011bc01800(0000) knlGS:0000000000000000
May 30 13:55:20 sanhead01 kernel: [699831.891974] CS: 0010 DS: 0000 ES: 0000
CR0: 000000008005003b
May 30 13:55:20 sanhead01 kernel: [699831.891977] CR2: 00007fbdb04a2000 CR3:
0000000118845000 CR4: 00000000000006e0
May 30 13:55:20 sanhead01 kernel: [699831.891979] DR0: 0000000000000000 DR1:
0000000000000000 DR2: 0000000000000000
May 30 13:55:20 sanhead01 kernel: [699831.891981] DR3: 0000000000000000 DR6:
00000000ffff0ff0 DR7: 0000000000000400
- May 30 13:55:20 sanhead01 kernel: [699831.891983]
+ May 30 13:55:20 sanhead01 kernel: [699831.891983]
May 30 13:55:20 sanhead01 kernel: [699831.891983] Call Trace:
May 30 13:55:20 sanhead01 kernel: [699831.891989]
[ext3:generic_file_splice_read+0x10b/0x1e10]
generic_file_splice_read+0x10b/0x4c0
May 30 13:55:20 sanhead01 kernel: [699831.891998] [ifind_fast+0x45/0xa0]
ifind_fast+0x45/0xa0
May 30 13:55:20 sanhead01 kernel: [699831.892002]
[ext3:iget_locked+0x44/0x800] iget_locked+0x44/0x180
May 30 13:55:20 sanhead01 kernel: [699831.892007] [<ffffffff883c85aa>]
:exportfs:find_acceptable_alias+0x1a/0xe0
May 30 13:55:20 sanhead01 kernel: [699831.892012] [<ffffffff883c8703>]
:exportfs:exportfs_decode_fh+0x93/0x270
May 30 13:55:20 sanhead01 kernel: [699831.892020] [<ffffffff88432490>]
:nfsd:nfsd_acceptable+0x0/0xf0
May 30 13:55:20 sanhead01 kernel: [699831.892032] [<ffffffff883dfa69>]
:sunrpc:cache_check+0x49/0x490
May 30 13:55:20 sanhead01 kernel: [699831.892040]
[set_current_groups+0x23b/0x240] set_current_groups+0x23b/0x240
May 30 13:55:20 sanhead01 kernel: [699831.892050]
[splice_direct_to_actor+0xbc/0x190] splice_direct_to_actor+0xbc/0x190
May 30 13:55:20 sanhead01 kernel: [699831.892058] [<ffffffff88433e50>]
:nfsd:nfsd_direct_splice_actor+0x0/0x20
May 30 13:55:20 sanhead01 kernel: [699831.892070] [<ffffffff88433e27>]
:nfsd:nfsd_vfs_read+0x3c7/0x3f0
May 30 13:55:20 sanhead01 kernel: [699831.892083] [<ffffffff88434402>]
:nfsd:nfsd_read+0xe2/0x100
May 30 13:55:20 sanhead01 kernel: [699831.892095] [<ffffffff883d8a90>]
:sunrpc:svc_sock_enqueue+0x80/0x360
May 30 13:55:20 sanhead01 kernel: [699831.892106] [<ffffffff8843c6fd>]
:nfsd:nfsd3_proc_read+0xfd/0x1a0
May 30 13:55:20 sanhead01 kernel: [699831.892116] [<ffffffff8842f271>]
:nfsd:nfsd_dispatch+0xb1/0x240
May 30 13:55:20 sanhead01 kernel: [699831.892130] [<ffffffff883d7dad>]
:sunrpc:svc_process+0x47d/0x7e0
May 30 13:55:20 sanhead01 kernel: [699831.892133] [<ffffffff80236540>]
default_wake_function+0x0/0x10
May 30 13:55:20 sanhead01 kernel: [699831.892138] [__down_read+0x12/0xb1]
__down_read+0x12/0xb1
May 30 13:55:20 sanhead01 kernel: [699831.892147] [<ffffffff8842f810>]
:nfsd:nfsd+0x0/0x2e0
May 30 13:55:20 sanhead01 kernel: [699831.892154] [<ffffffff8842f99f>]
:nfsd:nfsd+0x18f/0x2e0
May 30 13:55:20 sanhead01 kernel: [699831.892160] [child_rip+0xa/0x12]
child_rip+0xa/0x12
May 30 13:55:20 sanhead01 kernel: [699831.892167] [<ffffffff8842f810>]
:nfsd:nfsd+0x0/0x2e0
May 30 13:55:20 sanhead01 kernel: [699831.892179] [<ffffffff8842f810>]
:nfsd:nfsd+0x0/0x2e0
May 30 13:55:20 sanhead01 kernel: [699831.892182] [child_rip+0x0/0x12]
child_rip+0x0/0x12
It seems to me that the following patch is related to and most probably
fixes the problem:
http://www.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.25-
rc8/2.6.25-rc8-mm2/broken-out/generic_file_splice_read-fix-lockups.patch
Can you provide this patch as a security/stability update for the Ubuntu
Hardy LTS Kernel please?
System Information:
sanhead01:~# lsb_release -rd
Description: Ubuntu 8.04.4 LTS
Release: 8.04
Linux sanhead01 2.6.24-26-server #1 SMP Tue Dec 1 18:26:43 UTC 2009 x86_64
GNU/Linux
Ubuntu 2.6.24-26.64-server
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https://bugs.launchpad.net/bugs/790557
Title:
kernel soft lockup race condition on filesystem read operations in
generic_file_splice_read function
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