Hi,
This command is hanging on 2.6.39-rc3, where /mnt/ceph is
a ceph file system:
dd conv=fdatasync if=/dev/zero of=/mnt/ceph/zero.`hostname -s` bs=4k count=4k
It works on 2.6.38. As of commit e38f5b745075 in Linus'
tree it still doesn't work.
I bisected this to:
250df6ed274d767da844a5d9f05720b804240197 is the first bad commit
commit 250df6ed274d767da844a5d9f05720b804240197
Author: Dave Chinner <dchinner@xxxxxxxxxx>
Date: Tue Mar 22 22:23:36 2011 +1100
fs: protect inode->i_state with inode->i_lock
In the early stages of the bisection, bad commits would show this
in dmesg:
[ 137.004963] libceph: loaded (mon/osd proto 15/24, osdmap 5/6 5/6)
[ 137.056431] ceph: loaded (mds proto 32)
[ 137.063213] libceph: client4283 fsid 950217ad-499e-eab1-03f7-f6d245f42751
[ 137.063826] libceph: mon0 172.17.40.34:6789 session established
[ 219.658002] INFO: rcu_sched_state detected stall on CPU 0 (t=60000 jiffies)
For the last couple of bad commits during the bisection, the
client box would just hang and I'd have to power-cycle it.
When I reboot/remount after a hang, the file I was trying
to write is there, with size and date both zero:
# ls -l --time-style=+%s /mnt/ceph/zero.an1024
-rw-r--r-- 1 jaschut jaschut 0 0 /mnt/ceph/zero.an1024
strace suggests it's the write that hangs:
close(3) = 0
close(0) = 0
open("/dev/zero", O_RDONLY) = 0
lseek(0, 0, SEEK_CUR) = 0
close(1) = 0
open("/mnt/ceph/zero.an1024", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 1
rt_sigaction(SIGUSR1, NULL, {SIG_DFL, [], 0}, 8) = 0
rt_sigaction(SIGINT, NULL, {SIG_DFL, [], 0}, 8) = 0
rt_sigaction(SIGUSR1, {0x401a20, [INT USR1], SA_RESTORER, 0x7f3a97f292d0}, NULL, 8) = 0
rt_sigaction(SIGINT, {0x401a10, [INT USR1], SA_RESTORER|SA_NODEFER|SA_RESETHAND, 0x7f3a97f292d0}, NULL, 8) = 0
clock_gettime(CLOCK_MONOTONIC, {216, 671807533}) = 0
read(0, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 4096) = 4096
write(1, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 4096
Let me know if I can do anything else to help sort this out.
-- Jim
(Please Cc: me as I am not subscribed to lkml.)
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