Hi Jens, I gave your latest patchset from git.kernel.dk/linux-block blk-mq-sched I see a kernel oops when shutting down: [ 2132.708929] systemd-shutdown[1]: Detaching DM devices. [ 2132.965107] BUG: unable to handle kernel NULL pointer dereference at 00000000 00000001 [ 2133.037182] IP: dd_merged_requests+0x6/0x60 [ 2133.077816] PGD 0 [ 2133.077818] [ 2133.113087] Oops: 0000 [#1] SMP [ list of modules removed ] [ 2133.925265] CPU: 20 PID: 1 Comm: systemd-shutdow Not tainted 4.10.0-rc4+ #543 [ 2133.990034] Hardware name: HP ProLiant DL380p Gen8, BIOS P70 09/18/2013 [ 2134.050522] task: ffff88042d614040 task.stack: ffffc90003150000 [ 2134.106915] RIP: 0010:dd_merged_requests+0x6/0x60 [ 2134.150593] RSP: 0018:ffffc90003153b18 EFLAGS: 00010002 [ 2134.198740] RAX: ffffffff81cc6de0 RBX: ffff8804296d5040 RCX: 0000000000000001 [ 2134.262708] RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffff8804296d5040 [ 2134.326987] RBP: ffffc90003153b30 R08: 0000000000000000 R09: 0000000000000000 [ 2134.391054] R10: 0000000000000000 R11: 0001f8180001f815 R12: 0000000000000000 [ 2134.456095] R13: ffff8804296d5040 R14: ffff8804099801f0 R15: 0000000000000004 [ 2134.521196] FS: 00007fd64d3bf840(0000) GS:ffff88042f900000(0000) knlGS:0000000000000000 [ 2134.595178] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2134.648637] CR2: 0000000000000001 CR3: 000000081b892000 CR4: 00000000000406e0 [ 2134.713349] Call Trace: [ 2134.737168] ? elv_drain_elevator+0x29/0xa0 [ 2134.775821] __blk_drain_queue+0x52/0x1a0 [ 2134.812473] blk_queue_bypass_start+0x6e/0xa0 [ 2134.854009] blkcg_deactivate_policy+0x30/0xf0 [ 2134.894993] blk_throtl_exit+0x34/0x50 [ 2134.929450] blkcg_exit_queue+0x35/0x40 [ 2134.965089] blk_release_queue+0x33/0xe0 [ 2135.001364] kobject_cleanup+0x63/0x170 [ 2135.037412] kobject_put+0x25/0x50 [ 2135.068622] blk_cleanup_queue+0x198/0x260 [ 2135.107780] cleanup_mapped_device+0xb5/0xf0 [dm_mod] [ 2135.154741] __dm_destroy+0x1a5/0x290 [dm_mod] [ 2135.195009] dm_destroy+0x13/0x20 [dm_mod] [ 2135.232149] dev_remove+0xde/0x120 [dm_mod] [ 2135.270184] ? dev_suspend+0x210/0x210 [dm_mod] [ 2135.311478] ctl_ioctl+0x20b/0x510 [dm_mod] [ 2135.349680] ? terminate_walk+0xc3/0x140 [ 2135.385442] ? kmem_cache_free+0x10/0x260 [ 2135.422315] dm_ctl_ioctl+0x13/0x20 [dm_mod] Known issue? Cheers, Hannes -- Dr. Hannes Reinecke Teamlead Storage & Networking hare@xxxxxxx +49 911 74053 688 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton HRB 21284 (AG Nürnberg) -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
