Hi,
I have a CIFS share mounted with the options
//xxxx/yyyy /mnt/yyyy cifs
gid=zzzz,file_mode=0440,dir_mode=0550,credentials=/home/rbos/sdp.txt,sec=ntlmssp,ro,fsc,user,defaults
0 0
When I copy files from the mount, cachefilesd kicks in and copies pages
to /var/cache/fscache, and I'm able to copy some files out to warm the
cache, then copy them out again, without an error.
However, after a while, I start getting errors like these[1], like when
doing a cp -a on a large folder or simply waiting long enough while
aria2c runs (I'm seeding some torrents to Windows desktops). On my first
attempt, after a while, the VM hardlocked (I haven't captured a kernel
error of that event as I don't have console access) but I haven't tried
to reproduce that.
RHEL6, kernel 2.6.32-358.6.2.el6, recompiled to enable CIFS_FSCACHE.
SELinux is disabled.
What debugging steps should I take? Or is there some obvious solution?
[1]
BUG: Bad page state in process aria2c pfn:78078
page:ffffea0001a41a40 flags:0020000000001000 count:0 mapcount:0
mapping:(null) index:9 (Tainted: G B --------------- T)
Pid: 2975, comm: aria2c Tainted: G B --------------- T
2.6.32-358.6.2.el6.rbos.1.x86_64 #1
Call Trace:
[<ffffffff81128eb7>] ? bad_page+0x107/0x160
[<ffffffff8112c639>] ? free_hot_cold_page+0x1c9/0x220
[<ffffffff81175650>] ? mem_cgroup_cache_charge+0xc0/0xd0
[<ffffffff8112c74f>] ? free_hot_page+0x2f/0x60
[<ffffffff8112f36e>] ? __put_single_page+0x1e/0x30
[<ffffffff8112f4f5>] ? put_page+0x25/0x40
[<ffffffffa02c1cf8>] ? cifs_readpages+0x2a8/0x6e0 [cifs]
[<ffffffff8112e9a5>] ? __do_page_cache_readahead+0x185/0x210
[<ffffffff8112ea51>] ? ra_submit+0x21/0x30
[<ffffffff8112edc5>] ? ondemand_readahead+0x115/0x240
[<ffffffff8112fd10>] ? __lru_cache_add+0x40/0x90
[<ffffffff8112ef80>] ? page_cache_async_readahead+0x90/0xc0
[<ffffffff81143af7>] ? handle_pte_fault+0x487/0xb50
[<ffffffff8111bab3>] ? generic_file_aio_read+0x503/0x700
[<ffffffff81180eba>] ? do_sync_read+0xfa/0x140
[<ffffffff81096ca0>] ? autoremove_wake_function+0x0/0x40
[<ffffffff81148dfb>] ? __vm_enough_memory+0x3b/0x190
[<ffffffff8121bc36>] ? security_file_permission+0x16/0x20
[<ffffffff811817a5>] ? vfs_read+0xb5/0x1a0
[<ffffffff811818e1>] ? sys_read+0x51/0x90
[<ffffffff8100b072>] ? system_call_fastpath+0x16/0x1b
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