Mikulas Patocka ef7e7c82e0 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>		2013-11-08 09:10:28 -07:00
..
aoe	aoe: do not BUG if memory pressure prevented debugfs file creation	2013-09-11 15:59:28 -07:00
drbd	treewide: Add __GFP_NOWARN to k.alloc calls with v.alloc fallbacks	2013-08-20 13:06:40 +02:00
mtip32xx	Remove GENERIC_HARDIRQ config option	2013-09-13 15:09:52 +02:00
paride	block_device_operations->release() should return void	2013-05-07 02:16:21 -04:00
rsxx	rsxx: Adding in debugfs entries.	2013-06-19 13:52:10 +02:00
xen-blkback	xen/blkback: fix reference counting	2013-11-08 09:10:27 -07:00
amiflop.c	block_device_operations->release() should return void	2013-05-07 02:16:21 -04:00
ataflop.c	block_device_operations->release() should return void	2013-05-07 02:16:21 -04:00
brd.c	block: fix a probe argument to blk_register_region	2013-11-08 08:59:39 -07:00
cciss_cmd.h	cciss: use new doorbell-bit-5 reset method	2011-05-06 08:23:55 -06:00
cciss_scsi.c	cciss: switch to ->show_info()	2013-04-09 14:13:19 -04:00
cciss_scsi.h	cciss: add cciss_tape_cmds module paramter	2011-05-06 08:23:59 -06:00
cciss.c	cciss: fix info leak in cciss_ioctl32_passthru()	2013-09-24 17:00:26 -07:00
cciss.h	cciss: Adds simple mode functionality	2011-08-08 11:40:15 +02:00
cpqarray.c	cpqarray: fix info leak in ida_locked_ioctl()	2013-09-24 17:00:26 -07:00
cpqarray.h
cryptoloop.c	move linux/loop.h to drivers/block	2013-06-29 12:46:45 +04:00
DAC960.c	procfs: new helper - PDE_DATA(inode)	2013-04-09 14:13:32 -04:00
DAC960.h
floppy.c	Merge branch 'for-3.10/core' of git://git.kernel.dk/linux-block	2013-05-08 10:13:35 -07:00
hd.c	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
ida_cmd.h
ida_ioctl.h
Kconfig	rsxx: Changing the adapter name to the official name.	2013-06-19 13:52:09 +02:00
loop.c	loop: fix crash when using unassigned loop device	2013-11-08 09:10:28 -07:00
loop.h	move linux/loop.h to drivers/block	2013-06-29 12:46:45 +04:00
Makefile	NVMe: Add nvme-scsi.c	2013-03-28 14:50:49 -04:00
mg_disk.c	mg_disk: remove deprecated IRQF_DISABLED	2013-11-08 09:10:27 -07:00
nbd.c	nbd: correct disconnect behavior	2013-07-03 16:08:05 -07:00
nvme-core.c	NVMe: Merge issue on character device bring-up	2013-09-06 16:26:58 -04:00
nvme-scsi.c	NVMe: Use kzalloc instead of kmalloc+memset	2013-06-19 13:24:27 -04:00
osdblk.c	block: replace strict_strtoul() with kstrtoul()	2013-09-11 15:56:56 -07:00
pktcdvd.c	pktcdvd: fix defective misuses of pkt_<level>	2013-09-11 15:59:34 -07:00
ps3disk.c	Drivers: block: remove __dev* attributes.	2013-01-03 15:57:15 -08:00
ps3vram.c	procfs: new helper - PDE_DATA(inode)	2013-04-09 14:13:32 -04:00
rbd_types.h	rbd: get rid of RBD_MAX_SEG_NAME_LEN	2012-12-17 08:37:29 -06:00
rbd.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client	2013-09-19 12:50:37 -05:00
smart1,2.h	fix typos 'comamnd' -> 'command' in comments	2011-02-02 11:31:21 +01:00
sunvdc.c	sunvdc: Fix off-by-one in generic_request().	2013-02-14 11:49:01 -08:00
swim3.c	block_device_operations->release() should return void	2013-05-07 02:16:21 -04:00
swim_asm.S
swim.c	drivers/block/swim.c: remove unnecessary platform_set_drvdata()	2013-09-11 15:56:59 -07:00
sx8.c	block, sx8: fix pointer math issue getting fw version	2012-03-03 19:44:39 +01:00
umem.c	Drivers: block: remove __dev* attributes.	2013-01-03 15:57:15 -08:00
umem.h
virtio_blk.c	virtio_blk: Add missing 'static' qualifiers	2013-05-20 12:09:23 +09:30
xen-blkfront.c	xen-blkfront: improve aproximation of required grants per request	2013-11-08 09:10:27 -07:00
xsysace.c	xilinx systemace: Fix sparse warnings	2013-07-10 07:47:12 +02:00
z2ram.c	block_device_operations->release() should return void	2013-05-07 02:16:21 -04:00