tstile

[Patrick Welche <prlw1%cam.ac.uk@localhost>]

I just tried a this morning's source DOM0 and yeterday's DOMU. This is from
scratch, so not a known working setup. The surprise is:

Crash version 8.99.51, image version 8.99.51.
Output from a running system is unreliable.
crash> ps
PID    LID S CPU     FLAGS       STRUCT LWP *               NAME WAIT
987      1 3   0         0   ffffa60002d0a920                 sh tstile
1155     1 3   0   1000000   ffffa600016c6280                 xl tstile
1274     1 3   0   1000000   ffffa60002bca8e0                 xl tstile
...
crash> bt/a ffffa600016c6280
trace: pid 1155 lid 1 at 0xffffa60038aee950
sleepq_block() at sleepq_block+0x198
turnstile_block() at turnstile_block+0x4f6
rw_vector_enter() at rw_vector_enter+0xf5
genfs_lock() at genfs_lock+0x52
VOP_LOCK() at VOP_LOCK+0x71
vn_lock() at vn_lock+0x8c
lookup_once() at lookup_once+0x355
namei_tryemulroot() at namei_tryemulroot+0x2f4
namei() at namei+0x29
fd_nameiat.isra.2() at fd_nameiat.isra.2+0x54
do_sys_statat() at do_sys_statat+0x87
sys___stat50() at sys___stat50+0x28
syscall() at syscall+0x9c
--- syscall (number 439) ---
7f7ff618f0ba:
crash>  bt/a ffffa60002bca8e0
trace: pid 1274 lid 1 at 0xffffa60039ea9bd0
sleepq_block() at sleepq_block+0x198
turnstile_block() at turnstile_block+0x4f6
mutex_vector_enter() at mutex_vector_enter+0x13e
xenbus_dev_request_and_reply() at xenbus_dev_request_and_reply+0x2a
xenbus_dev_write() at xenbus_dev_write+0x152
kernfs_try_fileop() at kernfs_try_fileop+0x57
VOP_WRITE() at VOP_WRITE+0x3f
vn_write() at vn_write+0xe0
dofilewrite() at dofilewrite+0x7d
sys_write() at sys_write+0x49
syscall() at syscall+0x9c
--- syscall (number 4) ---
7f7ff604275a:

Writing this on the DOM0, so it is working. Will reboot and see if it
happens again...


Cheers,

Patrick