kernel 3.3. instability with
When writing 3 real-time and 1 regular file on disk simultaneously
(sync is blocking function). the rcu stall detection kicks in every
time when 3rd-4th attempt.
Just wanted understand the root cause of the problem
This the info on the stack dumps without xfs debug and with xfs
debug enabled receptively.
/dev/sda1 is XFS real time partition
/dev/sda2 is XFS non-real time partition.
count=1;
while [ 1 ];do
#create file on disk /dev/sda1 (-R realtime)
xfs_io -c open -f -R "/opt/corefiles/$count" -c "pwrite 0
20000000" -c close >> /dev/null &
let a=$count%3;
if [ $a -eq 0 ]; then
let count+=1;
#create file on disk /dev/sda2
xfs_io -c open -f "/opt/corefiles/$count" -c "pwrite 0 200000"
-c close >> /dev/null &
echo "sync";
sync /opt;
fi;
let count+=1;
done
Oops Log:
# ./xfs.sh
sync
INFO: rcu_sched detected stall on CPU 0 (t=60000 jiffies)
Call Trace:
[<805d3814>] dump_stack+0x8/0x34
[<80084398>] __rcu_pending+0x260/0x4c4
[<80084f00>] rcu_check_callbacks+0x118/0x180
[<80034ea0>] update_process_times+0x40/0x6c
[<8006e324>] tick_sched_timer+0x74/0xe4
[<8004cc50>] __run_hrtimer.clone.30+0x64/0x140
[<8004dc20>] hrtimer_interrupt+0x19c/0x4bc
[<8000bff8>] c0_compare_interrupt+0x50/0x88
[<8007c678>] handle_irq_event_percpu+0x5c/0x234
[<80080a74>] handle_percpu_irq+0x8c/0xc0
[<8007bd14>] generic_handle_irq+0x34/0x54
[<80006084>] do_IRQ+0x18/0x24
[<800034a4>] plat_irq_dispatch+0xd0/0x128
[<80004364>] ret_from_irq+0x0/0x4
[<8028b1c0>] xfs_inode_item_format_extents+0x1c/0xf0
[<8028b5a0>] xfs_inode_item_format+0x30c/0x320
[<80288fcc>] xfs_log_commit_cil+0xe0/0x564
[<8028346c>] xfs_trans_commit+0x148/0x2d0
[<8022ad40>] xfs_iomap_write_allocate+0x1b0/0x560
[<8021c12c>] xfs_map_blocks+0x224/0x278
[<8021d3d8>] xfs_vm_writepage+0x240/0x6ec
[<80092690>] __writepage+0x18/0xc8
[<80092ae0>] write_cache_pages+0x264/0x4c0
[<80092d84>] generic_writepages+0x48/0x84
[<800f0234>] writeback_single_inode+0x160/0x390
[<800f08c4>] writeback_sb_inodes+0x1c0/0x2a4
[<800f0f08>] __writeback_inodes_wb+0xbc/0x114
[<800f132c>] wb_writeback+0x204/0x20c
[<800f1cb4>] wb_do_writeback+0x29c/0x2a4
[<800f1d64>] bdi_writeback_thread+0xa8/0x1ac
[<80047d0c>] kthread+0x90/0x98
[<8000636c>] kernel_thread_helper+0x10/0x18
INFO: rcu_sched detected stall on CPU 0 (t=240030 jiffies)
Call Trace:
[<805d3814>] dump_stack+0x8/0x34
[<80084398>] __rcu_pending+0x260/0x4c4
[<80084f00>] rcu_check_callbacks+0x118/0x180
[<80034ea0>] update_process_times+0x40/0x6c
[<8006e324>] tick_sched_timer+0x74/0xe4
[<8004cc50>] __run_hrtimer.clone.30+0x64/0x140
[<8004dc20>] hrtimer_interrupt+0x19c/0x4bc
[<8000bff8>] c0_compare_interrupt+0x50/0x88
[<8007c678>] handle_irq_event_percpu+0x5c/0x234
[<80080a74>] handle_percpu_irq+0x8c/0xc0
[<8007bd14>] generic_handle_irq+0x34/0x54
[<80006084>] do_IRQ+0x18/0x24
[<800034a4>] plat_irq_dispatch+0xd0/0x128
[<80004364>] ret_from_irq+0x0/0x4
[<802c7c88>] arch_local_irq_restore+0x18/0x30
[<800c2b7c>] kmem_cache_alloc+0x78/0xd0
[<80238a40>] kmem_zone_alloc+0xa4/0x130
[<80238ae4>] kmem_zone_zalloc+0x18/0x54
[<80282f08>] xfs_trans_add_item+0x28/0x64
[<8028c98c>] _xfs_trans_bjoin+0x6c/0xcc
[<8028cddc>] xfs_trans_read_buf+0x234/0x304
[<8028d638>] xfs_rtbuf_get+0x148/0x168
[<8028df10>] xfs_rtmodify_summary+0x94/0x124
[<8028ed28>] xfs_rtallocate_range+0x180/0x328
[<8028f748>] xfs_rtallocate_extent_exact+0xc4/0x158
[<80290054>] xfs_rtallocate_extent_near+0xb0/0x448
[<80290ce4>] xfs_rtallocate_extent+0x1c8/0x1fc
[<8024a9fc>] xfs_bmap_rtalloc+0x1bc/0x3f8
[<8024df20>] xfs_bmapi_allocate+0xec/0x354
[<8025139c>] xfs_bmapi_write+0x264/0x82c
[<8022ad18>] xfs_iomap_write_allocate+0x188/0x560
[<8021c12c>] xfs_map_blocks+0x224/0x278
[<8021d3d8>] xfs_vm_writepage+0x240/0x6ec
[<80092690>] __writepage+0x18/0xc8
[<80092ae0>] write_cache_pages+0x264/0x4c0
[<80092d84>] generic_writepages+0x48/0x84
[<800f0234>] writeback_single_inode+0x160/0x390
[<800f08c4>] writeback_sb_inodes+0x1c0/0x2a4
[<800f0f08>] __writeback_inodes_wb+0xbc/0x114
[<800f132c>] wb_writeback+0x204/0x20c
[<800f1cb4>] wb_do_writeback+0x29c/0x2a4
[<800f1d64>] bdi_writeback_thread+0xa8/0x1ac
[<80047d0c>] kthread+0x90/0x98
[<8000636c>] kernel_thread_helper+0x10/0x18
With the xfs debug enabled this is the assert I get :
XFS: Assertion failed: xfs_trans_get_block_res(tp) > 0, file:
fs/xfs/xfs_bmap.c,
line: 5203
Kernel bug detected[#1]:
Cpu 0
$ 0 : 00000000 30008700 00000062 806b9dc4
$ 4 : 30008701 30008701 00000266 8032b24c
$ 8 : 00000010 00000002 00000001 00000000
$12 : 00000102 000003ff 00000000 00000000
$16 : 00000000 00000000 00001fff cf9b1300
$20 : 00001313 cf7dc000 cf76e420 00000002
$24 : 00000010 8032a9d0
$28 : cf672000 cf673c50 806416c8 80230718
Hi : 00000000
Lo : b0f9b000
epc : 80230718 assfail+0x28/0x2c
Not tainted
ra : 80230718 assfail+0x28/0x2c
Status: 30008703 KERNEL EXL IE
Cause : 00800024
PrId : 00025a11 (Broadcom BMIPS5000)
Modules linked in:
Process xfs_io (pid: 602, threadinfo=cf672000, task=cfcba9d8, tls=7729f460)
Stack : 817bc3a0 00000000 80642b64 806416c8 00001453 00000000 00000000
8025ab7c
00000d00 00000d00 cf76e400 00000000 00000000 cf673c9c cf673ca0
cf673cd8
cf673cf8 cf673d6c 00000000 00000001 00000002 00000000 cf673d98
80250778
ffffff83 000003ff 00001313 00000000 fffe0015 000fffff 00000ced
00000000
00000000 8023b9c4 00001000 00000000 fffe0015 000fffff 00001000
00000000
...
Call Trace:
[<80230718>] assfail+0x28/0x2c
[<8025ab7c>] xfs_bunmapi+0xcb8/0x12f8
[<80285144>] xfs_itruncate_extents+0x290/0x488
[<80237200>] xfs_free_eofblocks+0x2d4/0x354
[<80237c50>] xfs_release+0x1b8/0x294
[<80222fb0>] xfs_file_release+0x10/0x20
[<800c8978>] fput+0x104/0x288
[<800c3a50>] filp_close+0x6c/0xa0
[<800c3b50>] sys_close+0xcc/0x12c
[<8000db5c>] stack_done+0x20/0x40
Code: afbf001c 0c08c0f6 00403021 <0200000d> 27bdffd8 afa40014 afa50018 3c04
8064 3c058062
---[ end trace 8e5cc13475cfce38 ]---
Thank You
Kamal
--
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