Hi Jens, When I tried to run the SRP tests from the blktests repository against the v5.0 kernel several issues were reported. The same tests pass against kernel v4.20.
WARNING: CPU: 0 PID: 262 at block/blk-mq.c:683 blk_mq_start_request+0x234/0x280 Modules linked in: ib_srp scsi_transport_srp target_core_pscsi target_core_file ib_srpt target_core_iblock target_core_mod rdma_cm iw_cm ib_cm scsi_debug rdma_rxe ip6_udp_tunnel udp_tunnel null_blk dm_service_time ib_umad ib_uverbs ib_core mq_deadline kyber_iosched bfq scsi_dh_rdac scsi_dh_emc scsi_dh ath crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 crypto_simd cryptd glue_helper joydev virtio_console virtio_balloon serio_raw qemu_fw_cfg iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ip_tables x_tables hid_generic usbhid hid psmouse virtio_net virtio_scsi net_failo io_blk failover pata_acpi i2c_piix4 [last unloaded: null_blk] ================================================================== sd 4:0:0:0: Power-on or device reset occurred CPU: 0 PID: 262 Comm: kworker/0:1H Not tainted 5.0.0-rc1-dbg+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014 Workqueue: kblockd blk_mq_run_work_fn BUG: KASAN: null-ptr-deref in blk_mq_dispatch_rq_list+0x116/0xb10 RIP: 0010:blk_mq_start_request+0x234/0x280 Code: 01 e8 d0 d6 ad ff 85 c0 74 09 80 3d ec 2e b0 01 00 74 2c 65 ff 0d cc c7 97 7e 0f 85 53 fe ff ff e8 bc 11 96 ff e9 49 fe ff ff <0f> 0b e9 79 fe ff ff 0f 0b e9 2b fe ff ff 0f 0b e9 db fe ff ff e8 Read of size 8 at addr 0000000000000138 by task kworker/2:1H/350 RSP: 0018:ffff88811468fa88 EFLAGS: 00010202 CPU: 2 PID: 350 Comm: kworker/2:1H Not tainted 5.0.0-rc1-dbg+ #1 RAX: 0000000000000001 RBX: ffff888038c24c00 RCX: ffffffff816a1546 RDX: 0000000000000007 RSI: dffffc0000000000 RDI: ffff888038c24cd4 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014 RBP: ffff88811468faa8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88810b1124f0 Workqueue: kblockd blk_mq_run_work_fn R13: ffff888038c24cd4 R14: ffff888038c24c1c R15: ffff88803ffe4400 Call Trace: dump_stack+0x86/0xca FS: 0000000000000000(0000) GS:ffff88811b600000(0000) knlGS:0000000000000000 ? blk_mq_dispatch_rq_list+0x116/0xb10 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 kasan_report.cold.3+0x5/0x3e CR2: 0000565114f33710 CR3: 00000001140cc003 CR4: 00000000003606f0 ? blk_mq_dispatch_rq_list+0x116/0xb10 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 __asan_load8+0x54/0x90 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 blk_mq_dispatch_rq_list+0x116/0xb10 Call Trace: scsi_queue_rq+0x9d6/0x1360 ? blk_mq_flush_busy_ctxs+0x172/0x380 blk_mq_dispatch_rq_list+0x5fc/0xb10 ? blk_mq_get_driver_tag+0x270/0x270 ? blk_mq_flush_busy_ctxs+0x172/0x380 ? mark_held_locks+0xb0/0xb0 ? blk_mq_get_driver_tag+0x270/0x270 blk_mq_sched_dispatch_requests+0x2f7/0x300 ? mark_held_locks+0xb0/0xb0 ? blk_mq_sched_restart+0x40/0x40 blk_mq_sched_dispatch_requests+0x2f7/0x300 ? rcu_dynticks_curr_cpu_in_eqs+0x4c/0x60 ? blk_mq_sched_restart+0x40/0x40 ? rcu_is_watching+0x10/0x30 ? rcu_dynticks_curr_cpu_in_eqs+0x4c/0x60 __blk_mq_run_hw_queue+0xd6/0x180 ? rcu_is_watching+0x10/0x30 ? blk_mq_end_request+0x210/0x210 __blk_mq_run_hw_queue+0xd6/0x180 blk_mq_run_work_fn+0x27/0x30 ? blk_mq_end_request+0x210/0x210 process_one_work+0x4ae/0xa20 blk_mq_run_work_fn+0x27/0x30 ? pwq_dec_nr_in_flight+0x130/0x130 process_one_work+0x4ae/0xa20 worker_thread+0x67/0x5b0 ? pwq_dec_nr_in_flight+0x130/0x130 kthread+0x1cf/0x1f0 worker_thread+0x67/0x5b0 ? process_one_work+0xa20/0xa20 kthread+0x1cf/0x1f0 ? kthread_create_on_node+0xa0/0xa0 ? process_one_work+0xa20/0xa20 ret_from_fork+0x24/0x30 ? kthread_create_on_node+0xa0/0xa0 ================================================================== ret_from_fork+0x24/0x30 Disabling lock debugging due to kernel taint irq event stamp: 3962924 BUG: unable to handle kernel NULL pointer dereference at 0000000000000138 hardirqs last enabled at (3962923): [<ffffffff811a18d3>] ktime_get+0xe3/0x120 hardirqs last disabled at (3962924): [<ffffffff81002859>] trace_hardirqs_off_thunk+0x1a/0x1c #PF error: [normal kernel read fault] Bart.
