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[dm-devel] [just for lkml googlemail com: 2.6.36-rc1 hangs during XFS barrier test for /]



----- Forwarded message from Torsten Kaiser <just for lkml googlemail com> -----

Date: Fri, 20 Aug 2010 17:08:17 +0200
From: Torsten Kaiser <just for lkml googlemail com>
Subject: 2.6.36-rc1 hangs during XFS barrier test for /
To: linux-kernel vger kernel org

Hello,

after installing 2.6.36-rc1 my system gets stuck during "Mounting root..."

I'm using an initramfs to mount the root fs, because I'm using a
stacked setup with md (raid1) -> dm-crypt -> xfs.

Strange side effect: sometimes the cursor stops blinking for a few
seconds, but then resumes blinking. Each of these blinking stalls are
accompanied by a RCU stall message.

>From the serial console:
[    8.039603] Freeing unused kernel memory: 564k freed
[    8.049070] Write protecting the kernel read-only data: 10240k
[    8.059173] Freeing unused kernel memory: 604k freed
[    8.068930] Freeing unused kernel memory: 1732k freed
[   40.364439] SysRq : Changing Loglevel
[   40.371605] Loglevel set to 6
[   56.760017] INFO: rcu_sched_state detected stalls on CPUs/tasks: {
2} (detected by 0, t=4004 jiffies)
[   86.780016] INFO: rcu_sched_state detected stalls on CPUs/tasks: {
2} (detected by 0, t=7006 jiffies)
[  116.800018] INFO: rcu_sched_state detected stalls on CPUs/tasks: {
2} (detected by 0, t=10008 jiffies)
[  146.820018] INFO: rcu_sched_state detected stalls on CPUs/tasks: {
2} (detected by 0, t=13010 jiffies)
[  159.135015] SysRq : Show Blocked State
[  159.142014]  ffff88007f7449f0 0000000000000046 ffff8800071abd10
ffff880000000000
[  159.145007]  ffff88007ff4f770 0000000000012740 ffff8800071abfd8
0000000000012740
[  159.145007]  ffff8800071abfd8 ffff88007f744c50 ffff8800071abfd8
ffff88007f744c48
[  159.145007] Call Trace:
[  159.145007]  [<ffffffff8143ef40>] ? dm_wq_work+0x0/0x1a0
[  159.145007]  [<ffffffff8155e7fd>] ? io_schedule+0x3d/0x60
[  159.145007]  [<ffffffff8143e13a>] ? dm_wait_for_completion+0xba/0x150
[  159.145007]  [<ffffffff81035870>] ? default_wake_function+0x0/0x20
[  159.145007]  [<ffffffff8143ef40>] ? dm_wq_work+0x0/0x1a0
[  159.145007]  [<ffffffff8143ef40>] ? dm_wq_work+0x0/0x1a0
[  159.230029]  [<ffffffff8143ef82>] ? dm_wq_work+0x42/0x1a0
[  159.230029]  [<ffffffff8104d21b>] ? process_one_work+0xfb/0x370
[  159.230029]  [<ffffffff8104ed7c>] ? worker_thread+0x16c/0x360
[  159.230029]  [<ffffffff8104ec10>] ? worker_thread+0x0/0x360
[  159.230029]  [<ffffffff8104ec10>] ? worker_thread+0x0/0x360
[  159.230029]  [<ffffffff81052926>] ? kthread+0x96/0xa0
[  159.230029]  [<ffffffff81003194>] ? kernel_thread_helper+0x4/0x10
[  159.230029]  [<ffffffff81052890>] ? kthread+0x0/0xa0
[  159.230029]  [<ffffffff81003190>] ? kernel_thread_helper+0x0/0x10
[  159.230029]  ffff88011eda5b00 0000000000000086 0000000000012740
ffffffff00000000
[  159.230029]  ffffffff81a0d020 0000000000012740 ffff88011ed33fd8
0000000000012740
[  159.230029]  ffff88011ed33fd8 ffff88011eda5d60 ffff88011ed33fd8
ffff88011eda5d58
[  159.230029] Call Trace:
[  159.230029]  [<ffffffff8155eae5>] ? schedule_timeout+0x1c5/0x220
[  159.230029]  [<ffffffff8102d6c0>] ? __wake_up_common+0x50/0x80
[  159.230029]  [<ffffffff8155df7d>] ? wait_for_common+0x11d/0x190
[  159.230029]  [<ffffffff81035870>] ? default_wake_function+0x0/0x20
[  159.230029]  [<ffffffff811b0e6a>] ? xfs_buf_iowait+0x1a/0x60
[  159.230029]  [<ffffffff811b97d2>] ? xfs_barrier_test+0x42/0x90
[  159.230029]  [<ffffffff811b9874>] ? xfs_mountfs_check_barriers+0x54/0x70
[  159.230029]  [<ffffffff811b9b1d>] ? xfs_fs_fill_super+0x28d/0x2f0
[  159.230029]  [<ffffffff810c1511>] ? get_sb_bdev+0x1a1/0x1e0
[  159.230029]  [<ffffffff811b9890>] ? xfs_fs_fill_super+0x0/0x2f0
[  159.230029]  [<ffffffff810c0b83>] ? vfs_kern_mount+0x83/0x1f0
[  159.230029]  [<ffffffff810c0d63>] ? do_kern_mount+0x53/0x120
[  159.230029]  [<ffffffff810d8aba>] ? do_mount+0x28a/0x890
[  159.230029]  [<ffffffff8109211f>] ? memdup_user+0x3f/0x80
[  159.230029]  [<ffffffff810d915a>] ? sys_mount+0x9a/0x100
[  159.230029]  [<ffffffff8100246b>] ? system_call_fastpath+0x16/0x1b
[  161.529671] SysRq : Emergency Sync
[  164.016470] SysRq : Emergency Remount R/O
[  166.492523] SysRq : Emergency Sync
[  168.415529] SysRq : Resetting

The system is stuck at this point, with just the RCU messages
repeating until I reboot.
I did not see any OOPS or other error messages in the dmesg before this point.


Unrelated additional problem: On bootup with 2.6.36-rc1 I get ~800
bytes of random binary garbage via early_printk=serial. This does not
happen with 2.6.35 and earlier kernels.

Restart with earlier kernel:
[ 7816.426238] Restarting system.
[    0.000000] Linux version 2.6.34-rc7 (root treogen) (gcc version
4.4.3 (Gentoo 4.4.3-r2 p1.2) ) #1 SMP Mon May 10 19:45:19 CEST 2010
[    0.000000] Command line: fastboot earlyprintk=serial,ttyS0,115200
console=ttyS0,115200 console=tty1 crypt_root=/dev/md3 radeon.modeset=1
video=1280x1024
[    0.000000] BIOS-provided physical RAM map:
[    0.000000]  BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
[    0.000000]  BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
[    0.000000]  BIOS-e820: 00000000000e4000 - 0000000000100000 (reserved)
[    0.000000]  BIOS-e820: 0000000000100000 - 00000000dffd0000 (usable)
[    0.000000]  BIOS-e820: 00000000dffd0000 - 00000000dffde000 (ACPI data)
[    0.000000]  BIOS-e820: 00000000dffde000 - 00000000e0000000 (ACPI NVS)
[    0.000000]  BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved)
[    0.000000]  BIOS-e820: 00000000fee00000 - 00000000fef00000 (reserved)
[    0.000000]  BIOS-e820: 00000000ff700000 - 0000000100000000 (reserved)
[    0.000000]  BIOS-e820: 0000000100000000 - 0000000120000000 (usable)
[    0.000000] bootconsole [earlyser0] enabled
[    0.000000] NX (Execute Disable) protection: active
[    0.000000] DMI present.

Restart with 2.6.36-rc1:
[202944.603598] Restarting system.
{~800 byte of binary garbage}000100000 - 00000000dffd0000 (usable)
[    0.000000]  BIOS-e820: 00000000dffd0000 - 00000000dffde000 (ACPI data)
[    0.000000]  BIOS-e820: 00000000dffde000 - 00000000e0000000 (ACPI NVS)
[    0.000000]  BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved)
[    0.000000]  BIOS-e820: 00000000fee00000 - 00000000fef00000 (reserved)
[    0.000000]  BIOS-e820: 00000000ff700000 - 0000000100000000 (reserved)
[    0.000000]  BIOS-e820: 0000000100000000 - 0000000120000000 (usable)
[    0.000000] bootconsole [earlyser0] enabled
[    0.000000] NX (Execute Disable) protection: active
[    0.000000] DMI present.
[    0.000000] No AGP bridge found
[    0.000000] last_pfn = 0x120000 max_arch_pfn = 0x400000000
[    0.000000] x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106

The later repeat is OK (even on 2.6.36-rc1), so I suspect some problem
during the early init of the serial console, not some corruption of
the dmesg itself:
[    0.000000] Extended CMOS year: 2000
[    0.000000] Console: colour VGA+ 80x25
[    0.000000] console [tty1] enabled, bootconsole disabled
[    0.000000] Linux version 2.6.36-rc1 (root treogen) (gcc version
4.4.4 (Gentoo 4.4.4-r1 p1.0, pie-0.4.5) ) #1 SMP Thu Aug 19 21:58:14
CEST 2010
[    0.000000] Command line: fastboot earlyprintk=serial,ttyS0,115200
console=ttyS0,115200 console=tty1 crypt_root=/dev/md3 radeon.modeset=1
video=1280x1024
[    0.000000] BIOS-provided physical RAM map:
[    0.000000]  BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
[    0.000000]  BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
[    0.000000]  BIOS-e820: 00000000000e4000 - 0000000000100000 (reserved)
[    0.000000]  BIOS-e820: 0000000000100000 - 00000000dffd0000 (usable)
[    0.000000]  BIOS-e820: 00000000dffd0000 - 00000000dffde000 (ACPI data)
[    0.000000]  BIOS-e820: 00000000dffde000 - 00000000e0000000 (ACPI NVS)
[    0.000000]  BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved)
[    0.000000]  BIOS-e820: 00000000fee00000 - 00000000fef00000 (reserved)
[    0.000000]  BIOS-e820: 00000000ff700000 - 0000000100000000 (reserved)
[    0.000000]  BIOS-e820: 0000000100000000 - 0000000120000000 (usable)
[    0.000000] bootconsole [earlyser0] enabled
[    0.000000] NX (Execute Disable) protection: active
[    0.000000] DMI present.
[    0.000000] No AGP bridge found
[    0.000000] last_pfn = 0x120000 max_arch_pfn = 0x400000000
[    0.000000] x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106


Thanks for looking at this.

Torsten
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