diff options
| author | Mikulas Patocka <mpatocka@redhat.com> | 2013-10-16 00:14:38 +0400 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2013-11-08 20:10:28 +0400 |
| commit | ef7e7c82e02b602f29c2b87f42dcd6143a6777da (patch) | |
| tree | 0ac336fcc94d4a20f040df571d65910e47ef4850 /drivers/block/loop.c | |
| parent | ea5ec76d76da9279d12027c1828544c5ccbe7932 (diff) | |
| download | linux-ef7e7c82e02b602f29c2b87f42dcd6143a6777da.tar.xz | |
loop: fix crash when using unassigned loop device
When the loop module is loaded, it creates 8 loop devices /dev/loop[0-7].
The devices have no request routine and thus, when they are used without
being assigned, a crash happens.
For example, these commands cause crash (assuming there are no used loop
devices):
Kernel Fault: Code=26 regs=000000007f420980 (Addr=0000000000000010)
CPU: 1 PID: 50 Comm: kworker/1:1 Not tainted 3.11.0 #1
Workqueue: ksnaphd do_metadata [dm_snapshot]
task: 000000007fcf4078 ti: 000000007f420000 task.ti: 000000007f420000
[ 116.319988]
YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI
PSW: 00001000000001001111111100001111 Not tainted
r00-03 000000ff0804ff0f 00000000408bf5d0 00000000402d8204 000000007b7ff6c0
r04-07 00000000408a95d0 000000007f420950 000000007b7ff6c0 000000007d06c930
r08-11 000000007f4205c0 0000000000000001 000000007f4205c0 000000007f4204b8
r12-15 0000000000000010 0000000000000000 0000000000000000 0000000000000000
r16-19 000000001108dd48 000000004061cd7c 000000007d859800 000000000800000f
r20-23 0000000000000000 0000000000000008 0000000000000000 0000000000000000
r24-27 00000000ffffffff 000000007b7ff6c0 000000007d859800 00000000408a95d0
r28-31 0000000000000000 000000007f420950 000000007f420980 000000007f4208e8
sr00-03 0000000000000000 0000000000000000 0000000000000000 0000000000303000
sr04-07 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[ 117.549988]
IASQ: 0000000000000000 0000000000000000 IAOQ: 00000000402d82fc 00000000402d8300
IIR: 53820020 ISR: 0000000000000000 IOR: 0000000000000010
CPU: 1 CR30: 000000007f420000 CR31: ffffffffffffffff
ORIG_R28: 0000000000000001
IAOQ[0]: generic_make_request+0x11c/0x1a0
IAOQ[1]: generic_make_request+0x120/0x1a0
RP(r2): generic_make_request+0x24/0x1a0
Backtrace:
[<00000000402d83f0>] submit_bio+0x70/0x140
[<0000000011087c4c>] dispatch_io+0x234/0x478 [dm_mod]
[<0000000011087f44>] sync_io+0xb4/0x190 [dm_mod]
[<00000000110883bc>] dm_io+0x2c4/0x310 [dm_mod]
[<00000000110bfcd0>] do_metadata+0x28/0xb0 [dm_snapshot]
[<00000000401591d8>] process_one_work+0x160/0x460
[<0000000040159bc0>] worker_thread+0x300/0x478
[<0000000040161a70>] kthread+0x118/0x128
[<0000000040104020>] end_fault_vector+0x20/0x28
[<0000000040177220>] task_tick_fair+0x420/0x4d0
[<00000000401aa048>] invoke_rcu_core+0x50/0x60
[<00000000401ad5b8>] rcu_check_callbacks+0x210/0x8d8
[<000000004014aaa0>] update_process_times+0xa8/0xc0
[<00000000401ab86c>] rcu_process_callbacks+0x4b4/0x598
[<0000000040142408>] __do_softirq+0x250/0x2c0
[<00000000401789d0>] find_busiest_group+0x3c0/0xc70
[ 119.379988]
Kernel panic - not syncing: Kernel Fault
Rebooting in 1 seconds..
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block/loop.c')
| -rw-r--r-- | drivers/block/loop.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/drivers/block/loop.c b/drivers/block/loop.c index dbdb88a4976c..c8dac7305244 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -894,13 +894,6 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode, bio_list_init(&lo->lo_bio_list); - /* - * set queue make_request_fn, and add limits based on lower level - * device - */ - blk_queue_make_request(lo->lo_queue, loop_make_request); - lo->lo_queue->queuedata = lo; - if (!(lo_flags & LO_FLAGS_READ_ONLY) && file->f_op->fsync) blk_queue_flush(lo->lo_queue, REQ_FLUSH); @@ -1618,6 +1611,8 @@ static int loop_add(struct loop_device **l, int i) if (!lo) goto out; + lo->lo_state = Lo_unbound; + /* allocate id, if @id >= 0, we're requesting that specific id */ if (i >= 0) { err = idr_alloc(&loop_index_idr, lo, i, i + 1, GFP_KERNEL); @@ -1635,6 +1630,12 @@ static int loop_add(struct loop_device **l, int i) if (!lo->lo_queue) goto out_free_idr; + /* + * set queue make_request_fn + */ + blk_queue_make_request(lo->lo_queue, loop_make_request); + lo->lo_queue->queuedata = lo; + disk = lo->lo_disk = alloc_disk(1 << part_shift); if (!disk) goto out_free_queue; |