Hi I found this issue during my NVMe test on 4.17.0-rc7, here is the reproducer and dmesg log, let me know if you need more info, thanks. Reproduce steps: #!/bin/bash set -x fio -filename=/dev/nvme0n1p1 -iodepth=1 -thread -rw=randwrite -ioengine=psync -bssplit=5k/10:9k/10:13k/10:17k/10:21k/10:25k/10:29k/10:33k/10:37k/10:41k/10 -direct=1 -runtime=120 -size=-group_reporting -name=mytest -numjobs=60 & sleep 10 echo 0 > /sys/devices/system/cpu/cpu1/online echo 0 > /sys/devices/system/cpu/cpu2/online echo 0 > /sys/devices/system/cpu/cpu3/online dmesg log: [ 153.402709] IRQ 82: no longer affine to CPU1 [ 153.408596] smpboot: CPU 1 is now offline [ 153.426422] IRQ 86: no longer affine to CPU2 [ 153.431204] IRQ 89: no longer affine to CPU2 [ 153.437054] smpboot: CPU 2 is now offline [ 153.682095] IRQ 83: no longer affine to CPU3 [ 153.686866] IRQ 85: no longer affine to CPU3 [ 153.692712] smpboot: CPU 3 is now offline [ 183.847661] nvme nvme0: I/O 417 QID 2 timeout, completion polled [ 183.854410] nvme nvme0: I/O 251 QID 7 timeout, completion polled [ 183.861133] nvme nvme0: I/O 252 QID 7 timeout, completion polled [ 183.867851] nvme nvme0: I/O 253 QID 7 timeout, aborting [ 183.873699] nvme nvme0: I/O 254 QID 7 timeout, aborting [ 183.879530] nvme nvme0: Abort status: 0x0 [ 183.884017] nvme nvme0: I/O 255 QID 7 timeout, aborting [ 183.889847] nvme nvme0: Abort status: 0x0 [ 183.894338] nvme nvme0: I/O 495 QID 8 timeout, completion polled [ 183.901033] nvme nvme0: Abort status: 0x0 [ 183.905520] nvme nvme0: I/O 496 QID 8 timeout, aborting [ 183.911359] nvme nvme0: I/O 497 QID 8 timeout, aborting [ 183.917190] nvme nvme0: Abort status: 0x0 [ 183.921677] nvme nvme0: I/O 498 QID 8 timeout, aborting [ 183.927506] nvme nvme0: Abort status: 0x0 [ 183.931994] nvme nvme0: I/O 499 QID 8 timeout, aborting [ 183.937825] nvme nvme0: Abort status: 0x0 [ 183.942311] nvme nvme0: I/O 500 QID 8 timeout, aborting [ 183.948141] nvme nvme0: Abort status: 0x0 [ 183.952637] nvme nvme0: Abort status: 0x0 [ 214.057408] nvme nvme0: I/O 253 QID 7 timeout, reset controller [ 216.422702] nvme nvme0: I/O 254 QID 7 timeout, disable controller [ 216.438524] nvme nvme0: I/O 255 QID 7 timeout, disable controller [ 216.453428] nvme nvme0: I/O 496 QID 8 timeout, disable controller [ 216.469426] nvme nvme0: I/O 497 QID 8 timeout, disable controller [ 216.484435] nvme nvme0: I/O 498 QID 8 timeout, disable controller [ 216.496417] nvme nvme0: I/O 499 QID 8 timeout, disable controller [ 216.511418] nvme nvme0: I/O 500 QID 8 timeout, disable controller [ 249.830165] nvme nvme0: I/O 253 QID 7 timeout, completion polled [ 249.836901] nvme nvme0: I/O 254 QID 7 timeout, disable controller [ 249.858307] nvme nvme0: I/O 255 QID 7 timeout, disable controller [ 249.874172] nvme nvme0: I/O 496 QID 8 timeout, disable controller [ 249.887164] nvme nvme0: I/O 497 QID 8 timeout, disable controller [ 249.903175] nvme nvme0: I/O 498 QID 8 timeout, disable controller [ 249.918171] nvme nvme0: I/O 499 QID 8 timeout, disable controller [ 249.934172] nvme nvme0: I/O 500 QID 8 timeout, disable controller [ 369.695234] INFO: task kworker/u25:8:472 blocked for more than 120 seconds. [ 369.703012] Not tainted 4.17.0-rc7 #1 [ 369.707687] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 369.716433] kworker/u25:8 D 0 472 2 0x80000000 [ 369.716443] Workqueue: nvme-reset-wq nvme_reset_work [nvme] [ 369.716445] Call Trace: [ 369.719189] ? __schedule+0x290/0x870 [ 369.723280] schedule+0x32/0x80 [ 369.726791] blk_mq_freeze_queue_wait+0x46/0xb0 [ 369.731853] ? remove_wait_queue+0x60/0x60 [ 369.736435] nvme_wait_freeze+0x2e/0x50 [nvme_core] [ 369.741876] nvme_reset_work+0x819/0xd83 [nvme] [ 369.746942] ? __switch_to+0xa8/0x4f0 [ 369.751035] process_one_work+0x158/0x360 [ 369.755513] worker_thread+0x47/0x3e0 [ 369.759604] kthread+0xf8/0x130 [ 369.763114] ? max_active_store+0x80/0x80 [ 369.767590] ? kthread_bind+0x10/0x10 [ 369.771673] ret_from_fork+0x35/0x40 [ 369.775687] INFO: task fio:1826 blocked for more than 120 seconds. [ 369.782588] Not tainted 4.17.0-rc7 #1 [ 369.787259] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 369.796002] fio D 0 1826 1 0x00000080 [ 369.796004] Call Trace: [ 369.798736] ? __schedule+0x290/0x870 [ 369.802826] schedule+0x32/0x80 [ 369.806338] io_schedule+0x12/0x40 [ 369.810139] __blkdev_direct_IO_simple+0x1d3/0x310 [ 369.815493] ? bdput+0x10/0x10 [ 369.818905] blkdev_direct_IO+0x38e/0x3f0 [ 369.823383] ? __blkdev_direct_IO_simple+0x254/0x310 [ 369.828929] generic_file_direct_write+0xcc/0x170 [ 369.834187] __generic_file_write_iter+0xb7/0x1c0 [ 369.839441] blkdev_write_iter+0x9b/0x120 [ 369.843923] __vfs_write+0x100/0x180 [ 369.847917] vfs_write+0xad/0x1a0 [ 369.851622] ? __audit_syscall_exit+0x213/0x330 [ 369.856682] ksys_pwrite64+0x62/0x90 [ 369.860677] do_syscall_64+0x5b/0x180 [ 369.864769] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 369.870411] RIP: 0033:0x7f42e0955073 [ 369.874403] RSP: 002b:00007f42ba189b60 EFLAGS: 00000293 ORIG_RAX: 0000000000000012 [ 369.882856] RAX: ffffffffffffffda RBX: 00007f429c00cd40 RCX: 00007f42e0955073 [ 369.890823] RDX: 0000000000008c00 RSI: 00007f429c001000 RDI: 000000000000001f [ 369.898791] RBP: 00007f42bf195000 R08: 00000000001fc000 R09: 0000000000000007 [ 369.906757] R10: 0000005bb1581800 R11: 0000000000000293 R12: 0000000000000001 [ 369.914726] R13: 0000000000008c00 R14: 00007f429c00cd68 R15: 00007f42bf195008 [ 369.922696] INFO: task fio:1827 blocked for more than 120 seconds. [ 369.929597] Not tainted 4.17.0-rc7 #1 [ 369.934275] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 369.943018] fio D 0 1827 1 0x00000080 [ 369.943020] Call Trace: [ 369.945753] ? __schedule+0x290/0x870 [ 369.949844] schedule+0x32/0x80 [ 369.953355] blk_queue_enter+0xea/0x1c0 [ 369.957641] ? remove_wait_queue+0x60/0x60 [ 369.962216] generic_make_request+0x45/0x390 [ 369.966988] ? iov_iter_get_pages+0xbe/0x2c0 [ 369.971759] ? __schedule+0x298/0x870 [ 369.975849] submit_bio+0x6e/0x130 [ 369.979652] ? bio_iov_iter_get_pages+0xdd/0x110 [ 369.984809] __blkdev_direct_IO_simple+0x183/0x310 [ 369.990162] ? bdput+0x10/0x10 [ 369.993575] blkdev_direct_IO+0x38e/0x3f0 [ 369.998054] ? common_interrupt+0xa/0xf [ 370.002340] generic_file_direct_write+0xcc/0x170 [ 370.007595] __generic_file_write_iter+0xb7/0x1c0 [ 370.012849] blkdev_write_iter+0x9b/0x120 [ 370.017330] __vfs_write+0x100/0x180 [ 370.021325] vfs_write+0xad/0x1a0 [ 370.025029] ? __audit_syscall_exit+0x213/0x330 [ 370.030089] ksys_pwrite64+0x62/0x90 [ 370.034082] do_syscall_64+0x5b/0x180 [ 370.038173] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 370.043816] RIP: 0033:0x7f42e0955073 [ 370.047806] RSP: 002b:00007f42ba98ab60 EFLAGS: 00000293 ORIG_RAX: 0000000000000012 [ 370.056260] RAX: ffffffffffffffda RBX: 00007f429400cd40 RCX: 00007f42e0955073 [ 370.064229] RDX: 0000000000006400 RSI: 00007f4294001000 RDI: 000000000000002c [ 370.072197] RBP: 00007f42bf1add40 R08: 0000000003e00000 R09: 0000000000000005 [ 370.080164] R10: 00000030c362a400 R11: 0000000000000293 R12: 0000000000000001 [ 370.088132] R13: 0000000000006400 R14: 00007f429400cd68 R15: 00007f42bf1add48 Best Regards, Yi Zhang
