On Wed, Apr 12, 2023 at 12:11 PM Chaitanya Kulkarni <kch@xxxxxxxxxx> wrote: > > Make sure to check device queue mode in the null_validate_conf() > and return error for NULL_Q_RQ as we don't allow legacy I/O path, > without this patch we get OOPs when queue mode is set to 1 from > configfs, following are repro steps :- > > modprobe null_blk nr_devices=0 > mkdir config/nullb/nullb0 > echo 1 > config/nullb/nullb0/memory_backed > echo 4096 > config/nullb/nullb0/blocksize > echo 20480 > config/nullb/nullb0/size > echo 1 > config/nullb/nullb0/queue_mode > echo 1 > config/nullb/nullb0/power > > Entering kdb (current=0xffff88810acdd080, pid 2372) on processor 42 Oops: (null) > due to oops @ 0xffffffffc041c329 > CPU: 42 PID: 2372 Comm: sh Tainted: G O N 6.3.0-rc5lblk+ #5 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 > RIP: 0010:null_add_dev.part.0+0xd9/0x720 [null_blk] > Code: 01 00 00 85 d2 0f 85 a1 03 00 00 48 83 bb 08 01 00 00 00 0f 85 f7 03 00 00 80 bb 62 01 00 00 00 48 8b 75 20 0f 85 6d 02 00 00 <48> 89 6e 60 48 8b 75 20 bf 06 00 00 00 e8 f5 37 2c c1 48 8b 75 20 > RSP: 0018:ffffc900052cbde0 EFLAGS: 00010246 > RAX: 0000000000000001 RBX: ffff88811084d800 RCX: 0000000000000001 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888100042e00 > RBP: ffff8881053d8200 R08: ffffc900052cbd68 R09: ffff888105db2000 > R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000002 > R13: ffff888104765200 R14: ffff88810eec1748 R15: ffff88810eec1740 > FS: 00007fd445fd1740(0000) GS:ffff8897dfc80000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000000000060 CR3: 0000000166a00000 CR4: 0000000000350ee0 > DR0: ffffffff8437a488 DR1: ffffffff8437a489 DR2: ffffffff8437a48a > DR3: ffffffff8437a48b DR6: 00000000ffff0ff0 DR7: 0000000000000400 > Call Trace: > <TASK> > nullb_device_power_store+0xd1/0x120 [null_blk] > configfs_write_iter+0xb4/0x120 > vfs_write+0x2ba/0x3c0 > ksys_write+0x5f/0xe0 > do_syscall_64+0x3b/0x90 > entry_SYSCALL_64_after_hwframe+0x72/0xdc > RIP: 0033:0x7fd4460c57a7 > Code: 0d 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24 > RSP: 002b:00007ffd3792a4a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 > RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fd4460c57a7 > RDX: 0000000000000002 RSI: 000055b43c02e4c0 RDI: 0000000000000001 > RBP: 000055b43c02e4c0 R08: 000000000000000a R09: 00007fd44615b4e0 > R10: 00007fd44615b3e0 R11: 0000000000000246 R12: 0000000000000002 > R13: 00007fd446198520 R14: 0000000000000002 R15: 00007fd446198700 > </TASK> > > Signed-off-by: Chaitanya Kulkarni <kch@xxxxxxxxxx> Reviewed-by: Ming Lei <ming.lei@xxxxxxxxxx>
