I can reproduce a bug in virtio triggered by running under dm-thinp by just copying lots of files from my home directory into a freshly created filesystem on dm-thinp. The table setup I use for the thinly provisoned volume is: 0 73400320 thin-prov /dev/vdc1 /dev/vdc2 1048576 32 The virtio bug on says that it gets more segments than it allows to higher layers. [ 1944.721745] ------------[ cut here ]------------ [ 1944.724771] kernel BUG at /home/hch/work/linux-2.6/drivers/block/virtio_blk.c:178! [ 1944.725511] invalid opcode: 0000 [#1] SMP [ 1944.725511] last sysfs file: /sys/devices/virtual/block/dm-0/dm/name [ 1944.725511] Modules linked in: [ 1944.725511] [ 1944.725511] Pid: 0, comm: swapper Not tainted 2.6.37+ #95 /Bochs [ 1944.725511] EIP: 0060:[<c06d6808>] EFLAGS: 00010002 CPU: 0 [ 1944.725511] EIP is at do_virtblk_request+0x378/0x3a0 [ 1944.725511] EAX: 00000081 EBX: f5df7980 ECX: 00000000 EDX: 00000000 [ 1944.725511] ESI: f5dbf000 EDI: f5988670 EBP: f6409f6c ESP: f6409f28 [ 1944.725511] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 [ 1944.725511] Process swapper (pid: 0, ti=f6408000 task=c0d30ee0 task.ti=c0d1c000) [ 1944.725511] Stack: [ 1944.725511] 00000001 f5df7980 00000020 f5dbf4d8 f5df79ac f5dbf010 f5dbf020 00000004 [ 1944.725511] f5c75bf0 0000003d f5dbf034 00000001 f77dda00 00000001 f5c75bf0 f5c75da8 [ 1944.725511] f6409f94 f6409f7c c063b055 f5c75bf0 f5dbf000 f6409f88 c063b215 00000000 [ 1944.725511] Call Trace: [ 1944.725511] [<c063b055>] __blk_run_queue+0x65/0x120 [ 1944.725511] [<c063b215>] blk_start_queue+0x35/0x70 [ 1944.725511] [<c06d68fe>] blk_done+0xce/0xe0 [ 1944.725511] [<c06a1594>] vring_interrupt+0x24/0x40 [ 1944.725511] [<c01ad594>] handle_IRQ_event+0x44/0x150 [ 1944.725511] [<c01ad594>] ? handle_IRQ_event+0x44/0x150 [ 1944.725511] [<c01b0884>] ? move_native_irq+0x14/0x50 [ 1944.725511] [<c01af42b>] handle_edge_irq+0x9b/0x130 [ 1944.725511] [<c01af53c>] ? handle_fasteoi_irq+0x7c/0xc0 [ 1944.725511] [<c01af390>] ? handle_edge_irq+0x0/0x130 [ 1944.725511] <IRQ> [ 1944.725511] [<c01377ed>] ? do_IRQ+0x3d/0xb0 [ 1944.725511] [<c016f136>] ? irq_exit+0x56/0x70 [ 1944.725511] [<c014c266>] ? smp_apic_timer_interrupt+0x56/0x90 [ 1944.725511] [<c0136aa9>] ? common_interrupt+0x29/0x30 [ 1944.725511] [<c0153525>] ? native_safe_halt+0x5/0x10 [ 1944.725511] [<c013d493>] ? default_idle+0x73/0x170 [ 1944.725511] [<c01353ea>] ? cpu_idle+0x4a/0x80 [ 1944.725511] [<c09810d8>] ? rest_init+0x58/0x60 [ 1944.725511] [<c0d858e3>] ? start_kernel+0x2e5/0x2eb [ 1944.725511] [<c0d85428>] ? unknown_bootoption+0x0/0x1a0 [ 1944.725511] [<c0d850e0>] ? i386_start_kernel+0xe0/0xe8 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
