> I reproduced it again. The fs is idle apart from the defragment. > > mount -o nodatacow /dev/sdc1 backend > btrfsctl -d /mnt/backend/phil/i2 > This time I just mounted normally, please let me know what additional debug info you need. Thanks Phil mount /dev/sdc1 /mnt/backend btrfsctl -d /mnt/backend/phil/i2 Mar 9 12:20:31 sentryA kernel: [ 825.831962] Btrfs loaded Mar 9 12:20:31 sentryA kernel: [ 825.832473] device fsid 7c44381c3f903d28-e68bbb009cd0dfa2 devid 1 transid 917 /dev/sdc1 Mar 9 12:21:27 sentryA sshd[3693]: Accepted keyboard-interactive/pam for phil from 128.222.177.177 port 34776 ssh2 Mar 9 12:22:01 sentryA kernel: [ 916.058338] BUG: Bad page state in process btrfsctl pfn:27d407 Mar 9 12:22:01 sentryA kernel: [ 916.058342] page:ffffea0008b66188 flags:0040000000000000 count:0 mapcount:0 mapping:ffffffffa01 d798f index:0 Mar 9 12:22:01 sentryA kernel: [ 916.058346] Pid: 3673, comm: btrfsctl Not tainted 2.6.33-5-default #1 Mar 9 12:22:01 sentryA kernel: [ 916.058348] Call Trace: Mar 9 12:22:01 sentryA kernel: [ 916.058355] [<ffffffff810a2ddd>] bad_page+0x106/0x118 Mar 9 12:22:01 sentryA kernel: [ 916.058359] [<ffffffff810a4fb2>] get_page_from_freelist+0x49e/0x707 Mar 9 12:22:01 sentryA kernel: [ 916.058363] [<ffffffff810a542e>] __alloc_pages_nodemask+0x123/0x64d Mar 9 12:22:01 sentryA kernel: [ 916.058368] [<ffffffff81024aa2>] ? enqueue_task+0x5b/0x66 Mar 9 12:22:01 sentryA kernel: [ 916.058372] [<ffffffff81029c3e>] ? task_rq_lock+0x39/0x6b Mar 9 12:22:01 sentryA kernel: [ 916.058376] [<ffffffff8119cb0c>] ? prop_fraction_single+0x3c/0x5e Mar 9 12:22:01 sentryA kernel: [ 916.058380] [<ffffffff810c9210>] alloc_pages_current+0x96/0x9f Mar 9 12:22:01 sentryA kernel: [ 916.058384] [<ffffffff8109f60e>] __page_cache_alloc+0x59/0x5d Mar 9 12:22:01 sentryA kernel: [ 916.058387] [<ffffffff810a6e3a>] __do_page_cache_readahead+0x96/0x1a2 Mar 9 12:22:01 sentryA kernel: [ 916.058390] [<ffffffff810a6f62>] ra_submit+0x1c/0x20 Mar 9 12:22:01 sentryA kernel: [ 916.058393] [<ffffffff810a71f2>] ondemand_readahead+0x1b2/0x1c5 Mar 9 12:22:01 sentryA kernel: [ 916.058396] [<ffffffff810a72be>] page_cache_sync_readahead+0x17/0x19 Mar 9 12:22:01 sentryA kernel: [ 916.058412] [<ffffffffa02f01e1>] btrfs_force_ra+0x1c/0x25 [btrfs] Mar 9 12:22:01 sentryA kernel: [ 916.058424] [<ffffffffa03133a3>] btrfs_ioctl+0x558/0x959 [btrfs] Mar 9 12:22:01 sentryA kernel: [ 916.058428] [<ffffffff810e26e4>] vfs_ioctl+0x2a/0x9e Mar 9 12:22:01 sentryA kernel: [ 916.058431] [<ffffffff810e2c15>] do_vfs_ioctl+0x442/0x47f Mar 9 12:22:01 sentryA kernel: [ 916.058434] [<ffffffff8119e5e7>] ? __up_read+0x9e/0xa7 Mar 9 12:22:01 sentryA kernel: [ 916.058437] [<ffffffff810568fb>] ? up_read+0x9/0xb Mar 9 12:22:01 sentryA kernel: [ 916.058440] [<ffffffff810e2ca7>] sys_ioctl+0x55/0x77 Mar 9 12:22:01 sentryA kernel: [ 916.058444] [<ffffffff810029ab>] system_call_fastpath+0x16/0x1b -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
