BUG: spinlock recursion on CPU#0, vbdblkq/75
 

Hello,

I am getting BUG: spinlock recursion on CPU#0, vbdblkq/75 in bio.c.
Here is the log report.
BUG: spinlock recursion on CPU#0, vbdblkq/75
lock: 0x8699f840, .magic: dead4ead, .owner: vbdblkq/75, .owner_cpu: -1
CPU: 0 PID: 75 Comm: vbdblkq Tainted: G O
00000000 00000000 85ea9d74 81594761 85df0000 85ea9da0 8158fc74 8176dc44
8699f840 dead4ead 85df03d4 0000004b ffffffff 8699f840 8177ce83 00000003
85ea9db0 8158fc9c 8699f840 8699f840 85ea9dcc 80ea417a 8661c500 00000000
Call Trace:
dump_stack+0x4b/0x75
spin_dump+0x9a/0xa2
spin_bug+0x20/0x24
do_raw_spin_lock+0x10a/0x140
_raw_spin_lock+0x1c/0x20
try_to_wake_up+0x130/0x2f0
default_wake_function+0x10/0x20
wake_bit_function+0x4d/0x70
__wake_up_bit+0x54/0x90
unlock_page+0x40/0x50
mpage_end_io+0x3d/0xa0
bio_endio+0x49/0x90
blk_update_request+0xa3/0x3e0
? preempt_count_sub+0x75/0x130
? blkq_server_thread+0xcc/0x770
__blk_end_request_all+0x27/0x90
blkq_server_thread+0xdc/0x770
? finish_wait+0x60/0x60
? vblkd_request+0xd0/0xd0
kthread+0xe2/0x100
? vblkd_request+0xd0/0xd0
ret_from_kernel_thread+0x1b/0x28
? kthread_create_on_node+0x120/0x120

Is there is really issue with spinlock or bio_endio is been called recursively. How to fix it?


Thanks,
Diptendu

Looks like you have installed a bad module in your kernel.

Hi,

I have not updated any module or kernel and I am not been allowed to this. this issue is coming once in 3000 iteration and I am not sure why this issue is happening.

Thanks,
Diptendu

The error message told you. The crash is in vblkd_request, and the module vbdblkq taints the kernel which means it is not part of the kernel source. You will have to find the author of vbdblkq to fix the problem.