Works fine under KVM with virtio-blk, but still hangs during boot in an LPAR. FWIW, the system not only has scsi disks via fcp but also DASDs as a boot disk. Seems that this is the place where the system stops. (see the sysrq-t output at the bottom). Message "[ 0.247484] Linux version 4.15.0-rc1+ (cborntra@s38lp08) (gcc version 6.3.1 2 " "0161221 (Red Hat 6.3.1-1.0.ibm) (GCC)) #229 SMP Wed Nov 29 20:05:35 CET 2017 " "[ 0.247489] setup: Linux is running natively in 64-bit mode " "[ 0.247661] setup: The maximum memory size is 1048576MB " "[ 0.247670] setup: Reserving 1024MB of memory at 1047552MB for crashkernel (S " "ystem RAM: 1047552MB) " "[ 0.247688] numa: NUMA mode: plain " "[ 0.247794] cpu: 64 configured CPUs, 0 standby CPUs " "[ 0.247834] cpu: The CPU configuration topology of the machine is: 0 0 4 2 3 " "8 / 4 " "[ 0.248279] Write protected kernel read-only data: 12456k " "[ 0.265131] Zone ranges: " "[ 0.265134] DMA [mem 0x0000000000000000-0x000000007fffffff] " "[ 0.265136] Normal [mem 0x0000000080000000-0x000000ffffffffff] " "[ 0.265137] Movable zone start for each node " "[ 0.265138] Early memory node ranges " "[ 0.265139] node 0: [mem 0x0000000000000000-0x000000ffffffffff] " "[ 0.265141] Initmem setup node 0 [mem 0x0000000000000000-0x000000ffffffffff] " "[ 7.445561] random: fast init done " "[ 7.449194] percpu: Embedded 23 pages/cpu @000000fbbe600000 s56064 r8192 d299 " "52 u94208 " "[ 7.449380] Built 1 zonelists, mobility grouping on. Total pages: 264241152 " "[ 7.449381] Policy zone: Normal " "[ 7.449384] Kernel command line: elevator=deadline audit_enable=0 audit=0 aud " "it_debug=0 selinux=0 crashkernel=1024M printk.time=1 zfcp.dbfsize=100 dasd=241c, " "241d,241e,241f root=/dev/dasda1 kvm.nested=1 BOOT_IMAGE=0 " "[ 7.449420] audit: disabled (until reboot) " "[ 7.450513] log_buf_len individual max cpu contribution: 4096 bytes " "[ 7.450514] log_buf_len total cpu_extra contributions: 1044480 bytes " "[ 7.450515] log_buf_len min size: 131072 bytes " "[ 7.450788] log_buf_len: 2097152 bytes " "[ 7.450789] early log buf free: 125076(95%) " "[ 11.040620] Memory: 1055873868K/1073741824K available (8248K kernel code, 107 " "8K rwdata, 4204K rodata, 812K init, 700K bss, 17867956K reserved, 0K cma-reserve " "d) " "[ 11.040938] SLUB: HWalign=256, Order=0-3, MinObjects=0, CPUs=256, Nodes=1 " "[ 11.040969] ftrace: allocating 26506 entries in 104 pages " "[ 11.051476] Hierarchical RCU implementation. " "[ 11.051476] RCU event tracing is enabled. " "[ 11.051478] RCU debug extended QS entry/exit. " "[ 11.053263] NR_IRQS: 3, nr_irqs: 3, preallocated irqs: 3 " "[ 11.053444] clocksource: tod: mask: 0xffffffffffffffff max_cycles: 0x3b0a9be8 " "03b0a9, max_idle_ns: 1805497147909793 ns " "[ 11.160192] console [ttyS0] enabled " "[ 11.308228] pid_max: default: 262144 minimum: 2048 " "[ 11.308298] Security Framework initialized " "[ 11.308300] SELinux: Disabled at boot. " "[ 11.354028] Dentry cache hash table entries: 33554432 (order: 16, 268435456 b " "ytes) " "[ 11.376945] Inode-cache hash table entries: 16777216 (order: 15, 134217728 by " "tes) " "[ 11.377685] Mount-cache hash table entries: 524288 (order: 10, 4194304 bytes) " "[ 11.378401] Mountpoint-cache hash table entries: 524288 (order: 10, 4194304 b " "ytes) " "[ 11.378984] Hierarchical SRCU implementation. " "[ 11.380032] smp: Bringing up secondary CPUs ... " "[ 11.393634] smp: Brought up 1 node, 64 CPUs " "[ 11.585458] devtmpfs: initialized " "[ 11.588589] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, ma " "x_idle_ns: 19112604462750000 ns " "[ 11.588998] futex hash table entries: 65536 (order: 12, 16777216 bytes) " "[ 11.591926] NET: Registered protocol family 16 " "[ 11.596413] HugeTLB registered 1.00 MiB page size, pre-allocated 0 pages " "[ 11.597604] SCSI subsystem initialized " "[ 11.597611] pps_core: LinuxPPS API ver. 1 registered " "[ 11.597612] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giome " "tti <giometti@xxxxxxxx> " "[ 11.597614] PTP clock support registered " "[ 11.599088] NetLabel: Initializing " "[ 11.599089] NetLabel: domain hash size = 128 " "[ 11.599090] NetLabel: protocols = UNLABELED CIPSOv4 CALIPSO " "[ 11.599101] NetLabel: unlabeled traffic allowed by default " "[ 11.612542] PCI host bridge to bus 0000:00 " "[ 11.612546] pci_bus 0000:00: root bus resource [mem 0x8000000000000000-0x8000 " "0000007fffff 64bit pref] " "[ 11.612548] pci_bus 0000:00: No busn resource found for root bus, will use [b " "us 00-ff] " "[ 11.616458] iommu: Adding device 0000:00:00.0 to group 0 " "[ 12.291894] VFS: Disk quotas dquot_6.6.0 " "[ 12.291942] VFS: Dquot-cache hash table entries: 512 (order 0, 4096 bytes) " "[ 12.292226] NET: Registered protocol family 2 " "[ 12.292662] TCP established hash table entries: 524288 (order: 10, 4194304 by " "tes) " "[ 12.294559] TCP bind hash table entries: 65536 (order: 8, 1048576 bytes) " "[ 12.295008] TCP: Hash tables configured (established 524288 bind 65536) " "[ 12.295229] UDP hash table entries: 65536 (order: 9, 2097152 bytes) " "[ 12.296173] UDP-Lite hash table entries: 65536 (order: 9, 2097152 bytes) " "[ 12.297343] NET: Registered protocol family 1 " "[ 12.301053] workingset: timestamp_bits=42 max_order=28 bucket_order=0 " "[ 12.304670] NET: Registered protocol family 38 " "[ 12.304694] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 2 " "50) " "[ 12.304939] io scheduler noop registered " "[ 12.304940] io scheduler deadline registered (default) " "[ 12.304975] io scheduler cfq registered " "[ 12.304977] io scheduler mq-deadline registered (default) " "[ 12.304977] io scheduler kyber registered " "[ 12.305949] atomic64_test: passed " "[ 12.305985] hvc_iucv: The z/VM IUCV HVC device driver cannot be used without " "z/VM " "[ 12.317868] loop: module loaded " "[ 12.318153] tun: Universal TUN/TAP device driver, 1.6 " "[ 12.318240] mlx4_core: Mellanox ConnectX core driver v4.0-0 " "[ 12.318251] mlx4_core: Initializing 0000:00:00.0 " "[ 12.318324] mlx4_core 0000:00:00.0: enabling device (0000 -> 0002) " "[ 12.319389] mlx4_core 0000:00:00.0: Detected virtual function - running in sl " "ave mode " "[ 12.319448] mlx4_core 0000:00:00.0: Sending reset " "[ 12.320791] mlx4_core 0000:00:00.0: Sending vhcr0 " "[ 12.326014] mlx4_core 0000:00:00.0: Requested number of MACs is too much for " "port 1, reducing to 64 " "[ 12.326016] mlx4_core 0000:00:00.0: Requested number of VLANs is too much for " " port 1, reducing to 1 " "[ 12.326240] mlx4_core 0000:00:00.0: HCA minimum page size:512 " "[ 12.327666] mlx4_core 0000:00:00.0: Timestamping is not supported in slave mo " "de " "[ 12.537132] mlx4_en: Mellanox ConnectX HCA Ethernet driver v4.0-0 " "[ 12.537646] mlx4_en 0000:00:00.0: Activating port:1 " "[ 12.578197] mlx4_en: 0000:00:00.0: Port 1: Using 32 TX rings " "[ 12.578201] mlx4_en: 0000:00:00.0: Port 1: Using 8 RX rings " "[ 12.578676] mlx4_en: 0000:00:00.0: Port 1: Initializing port " "[ 12.579202] mlx4_en 0000:00:00.0: Activating port:2 " "[ 12.613180] mlx4_en: 0000:00:00.0: Port 2: Using 32 TX rings " "[ 12.613182] mlx4_en: 0000:00:00.0: Port 2: Using 8 RX rings " "[ 12.613592] mlx4_en: 0000:00:00.0: Port 2: Initializing port " "[ 12.614141] VFIO - User Level meta-driver version: 0.3 " "[ 12.614231] mousedev: PS/2 mouse device common for all mice " "[ 12.614247] IR NEC protocol handler initialized " "[ 12.614248] IR RC5(x/sz) protocol handler initialized " "[ 12.614249] IR RC6 protocol handler initialized " "[ 12.614250] IR JVC protocol handler initialized " "[ 12.614251] IR Sony protocol handler initialized " "[ 12.614252] IR SANYO protocol handler initialized " "[ 12.614253] IR Sharp protocol handler initialized " "[ 12.614254] IR MCE Keyboard/mouse protocol handler initialized " "[ 12.614255] IR XMP protocol handler initialized " "[ 12.614318] device-mapper: uevent: version 1.0.3 " "[ 12.614376] device-mapper: ioctl: 4.37.0-ioctl (2017-09-20) initialised: dm-d " "evel@xxxxxxxxxx " "[ 12.614856] cio: Channel measurement facility initialized using format extend " "ed (mode autodetected) " "[ 12.615194] Discipline DIAG cannot be used without z/VM " "[ 12.619692] dasd-eckd 0.0.241c: A channel path to the device has become opera " "tional " "[ 12.619847] dasd-eckd 0.0.241e: A channel path to the device has become opera " "tional " "[ 12.619992] dasd-eckd 0.0.241d: A channel path to the device has become opera " "tional " "[ 12.620344] dasd-eckd 0.0.241f: A channel path to the device has become opera " "tional " "[ 12.621880] dasd-eckd 0.0.241e: New DASD 3390/0C (CU 3990/01) with 30051 cyli " "nders, 15 heads, 224 sectors " "[ 12.622097] dasd-eckd 0.0.241d: New DASD 3390/0C (CU 3990/01) with 30051 cyli " "nders, 15 heads, 224 sectors " "[ 12.622286] dasd-eckd 0.0.241f: New DASD 3390/0C (CU 3990/01) with 30051 cyli " "nders, 15 heads, 224 sectors " "[ 12.622519] dasd-eckd 0.0.241c: New DASD 3390/0C (CU 3990/01) with 30051 cyli " "nders, 15 heads, 224 sectors " "[ 12.637350] dasd-eckd 0.0.241c: DASD with 4 KB/block, 21636720 KB total size, " " 48 KB/track, compatible disk layout " "[ 12.642780] dasd-eckd 0.0.241d: DASD with 4 KB/block, 21636720 KB total size, " " 48 KB/track, compatible disk layout " "[ 12.644616] dasdb:VOL1/ 0X241D: dasdb1 " "[ 12.644943] dasd-eckd 0.0.241e: DASD with 4 KB/block, 21636720 KB total size, " " 48 KB/track, compatible disk layout " "[ 12.645439] dasd-eckd 0.0.241f: DASD with 4 KB/block, 21636720 KB total size, " " 48 KB/track, compatible disk layout " "[ 12.647222] dasda:VOL1/ 0X241C: dasda1 " "[ 12.651236] dasdc:VOL1/ 0X241E: dasdc1 " "[ 12.651704] dasdd:VOL1/ 0X241F: dasdd1 " "[ 13.171832] drop_monitor: Initializing network drop monitor service " "[ 13.172016] Initializing XFRM netlink socket " "[ 13.172105] NET: Registered protocol family 10 " "[ 13.172902] Segment Routing with IPv6 " "[ 13.172915] mip6: Mobile IPv6 " "[ 13.172916] NET: Registered protocol family 17 " "[ 13.172923] Key type dns_resolver registered " "[ 13.173033] registered taskstats version 1 " "[ 13.173394] Key type encrypted registered " "[ 13.173665] md: Waiting for all devices to be available before autodetect " "[ 13.173667] md: If you don't use raid, use raid=noautodetect " "[ 13.173894] md: Autodetecting RAID arrays. " "[ 13.173896] md: autorun ... " "[ 13.173896] md: ... autorun DONE. " "[ 13.174405] EXT4-fs (dasda1): couldn't mount as ext3 due to feature incompati " "bilities " "[ 13.174647] EXT4-fs (dasda1): couldn't mount as ext2 due to feature incompati " "bilities " "[ 13.199229] EXT4-fs (dasda1): mounted filesystem with ordered data mode. Opts " ": (null) " "[ 13.199233] VFS: Mounted root (ext4 filesystem) readonly on device 94:1. " "[ 16.773545] random: crng init done " "[ 112.413804] sysrq: SysRq : Show State " "[ 112.413809] task PC stack pid father " "[ 112.413811] swapper/0 D 0 1 0 0x00000000 " "[ 112.413814] Call Trace: " "[ 112.413820] ([<0000000000905458>] __schedule+0x398/0x850) " "[ 112.413821] [<000000000090595a>] schedule+0x4a/0xb8 " "[ 112.413824] [<000000000019e8c4>] io_schedule+0x34/0x58 " "[ 112.413826] [<00000000009064f6>] bit_wait_io+0x2e/0x90 " "[ 112.413827] [<0000000000905fe8>] __wait_on_bit+0xb8/0x110 " "[ 112.413828] [<00000000009060de>] out_of_line_wait_on_bit+0x9e/0xb0 " "[ 112.413833] [<000000000041e5ba>] __ext4_get_inode_loc+0x52a/0x570 " "[ 112.413836] [<0000000000422664>] ext4_iget+0x7c/0xc28 " "[ 112.413839] [<000000000043cf5a>] ext4_lookup+0x12a/0x238 " "[ 112.413843] [<00000000003620b6>] lookup_slow+0xae/0x198 " "[ 112.413844] [<00000000003657a0>] walk_component+0x210/0x358 " "[ 112.413845] [<000000000036629a>] path_lookupat+0xe2/0x278 " "[ 112.413847] [<0000000000368174>] filename_lookup+0x9c/0x160 " "[ 112.413848] [<000000000036835c>] user_path_at_empty+0x5c/0x70 " "[ 112.413851] [<0000000000380b94>] do_mount+0x74/0xd10 " "[ 112.413853] [<0000000000381c1c>] SyS_mount+0xa4/0x108 " "[ 112.413857] [<00000000005c02f8>] devtmpfs_mount+0x60/0xc0 " "[ 112.413860] [<0000000000e395c6>] prepare_namespace+0x18e/0x1c0 " "[ 112.413861] [<0000000000e38e46>] kernel_init_freeable+0x26e/0x288 " "[ 112.413865] [<0000000000900572>] kernel_init+0x2a/0x150 " "[ 112.413868] [<000000000090a9c2>] kernel_thread_starter+0x6/0xc " "[ 112.413869] [<000000000090a9bc>] kernel_thread_starter+0x0/0xc " "[ 112.413870] kthreadd S 0 2 0 0x00000000 " "[ 112.418205] [<000000000018ee66>] kthread+0x13e/0x160 " "[ 112.418206] [<000000000090a9c2>] kernel_thread_starter+0x6/0xc " "[ 112.418207] [<000000000090a9bc>] kernel_thread_starter+0x0/0xc " "[ 112.418208] kworker/51:1 I 0 441 2 0x00000000 " "[ 112.418210] Call Trace: " "[ 112.418211] ([<0000000000905458>] __schedule+0x398/0x850) " "[ 112.418213] [<000000000090595a>] schedule+0x4a/0xb8 " "[ 112.418214] [<00000000001882ec>] worker_thread+0xe4/0x4f8 " "[ 112.418215] [<000000000018ee66>] kthread+0x13e/0x160 " "[ 112.418217] [<000000000090a9c2>] kernel_thread_starter+0x6/0xc " "[ 112.418218] [<000000000090a9bc>] kernel_thread_starter+0x0/0xc " "[ 112.418219] kworker/53:1 I 0 442 2 0x00000000 " "[ 112.418221] Call Trace: " "[ 112.418222] ([<0000000000905458>] __schedule+0x398/0x850) " "[ 112.418223] [<000000000090595a>] schedule+0x4a/0xb8 " "[ 112.418225] [<00000000001882ec>] worker_thread+0xe4/0x4f8 " "[ 112.418226] [<000000000018ee66>] kthread+0x13e/0x160 " "[ 112.418227] [<000000000090a9c2>] kernel_thread_starter+0x6/0xc " "[ 112.418229] [<000000000090a9bc>] kernel_thread_starter+0x0/0xc " "[ 112.418230] kworker/52:1 I 0 443 2 0x00000000 " "[ 112.418231] Call Trace: " "[ 112.418233] ([<0000000000905458>] __schedule+0x398/0x850) " "[ 112.418234] [<000000000090595a>] schedule+0x4a/0xb8 " "[ 112.418235] [<00000000001882ec>] worker_thread+0xe4/0x4f8 " "[ 112.418237] [<000000000018ee66>] kthread+0x13e/0x160 " "[ 112.418238] [<000000000090a9c2>] kernel_thread_starter+0x6/0xc " "[ 112.418239] [<000000000090a9bc>] kernel_thread_starter+0x0/0xc " "[ 112.418240] kworker/54:1 I 0 444 2 0x00000000 " "[ 112.418242] Call Trace: " "[ 112.418243] ([<0000000000905458>] __schedule+0x398/0x850) " "[ 112.418244] [<000000000090595a>] schedule+0x4a/0xb8 " "[ 112.418246] [<00000000001882ec>] worker_thread+0xe4/0x4f8 " "[ 112.418247] [<000000000018ee66>] kthread+0x13e/0x160 " "[ 112.418249] [<000000000090a9c2>] kernel_thread_starter+0x6/0xc " "[ 112.418250] [<000000000090a9bc>] kernel_thread_starter+0x0/0xc " "[ 112.418251] kworker/55:1 I 0 445 2 0x00000000 " "[ 112.418253] Call Trace: " "[ 112.418254] ([<0000000000905458>] __schedule+0x398/0x850) " "[ 112.418255] [<000000000090595a>] schedule+0x4a/0xb8 " "[ 112.418256] [<00000000001882ec>] worker_thread+0xe4/0x4f8 " "[ 112.418258] [<000000000018ee66>] kthread+0x13e/0x160 " "[ 112.418259] [<000000000090a9c2>] kernel_thread_starter+0x6/0xc " "[ 112.418260] [<000000000090a9bc>] kernel_thread_starter+0x0/0xc " "[ 112.418262] kworker/57:1 I 0 446 2 0x00000000 " "[ 112.418263] Call Trace: " "[ 112.418265] ([<0000000000905458>] __schedule+0x398/0x850) " "[ 112.418266] [<000000000090595a>] schedule+0x4a/0xb8 " "[ 112.418267] [<00000000001882ec>] worker_thread+0xe4/0x4f8 " "[ 112.418268] [<000000000018ee66>] kthread+0x13e/0x160 " "[ 112.418270] [<000000000090a9c2>] kernel_thread_starter+0x6/0xc " "[ 112.418271] [<000000000090a9bc>] kernel_thread_starter+0x0/0xc " "[ 112.418272] kworker/56:1 I 0 447 2 0x00000000 " "[ 112.418274] Call Trace: " "[ 112.418275] ([<0000000000905458>] __schedule+0x398/0x850) " "[ 112.418276] [<000000000090595a>] schedule+0x4a/0xb8 " "[ 112.418278] [<00000000001882ec>] worker_thread+0xe4/0x4f8 " "[ 112.418279] [<000000000018ee66>] kthread+0x13e/0x160 " "[ 112.418280] [<000000000090a9c2>] kernel_thread_starter+0x6/0xc " "[ 112.418282] [<000000000090a9bc>] kernel_thread_starter+0x0/0xc " "[ 112.418283] kworker/59:1 I 0 448 2 0x00000000 " "[ 112.418284] Call Trace: " "[ 112.418286] ([<0000000000905458>] __schedule+0x398/0x850) " "[ 112.418287] [<000000000090595a>] schedule+0x4a/0xb8 " "[ 112.418288] [<00000000001882ec>] worker_thread+0xe4/0x4f8 " "[ 112.418290] [<000000000018ee66>] kthread+0x13e/0x160 " "[ 112.418291] [<000000000090a9c2>] kernel_thread_starter+0x6/0xc " "[ 112.418292] [<000000000090a9bc>] kernel_thread_starter+0x0/0xc " "[ 112.418293] kworker/58:1 I 0 449 2 0x00000000 " "[ 112.418295] Call Trace: " "[ 112.418296] ([<0000000000905458>] __schedule+0x398/0x850) " "[ 112.418297] [<000000000090595a>] schedule+0x4a/0xb8 " "[ 112.418299] [<00000000001882ec>] worker_thread+0xe4/0x4f8 " "[ 112.418300] [<000000000018ee66>] kthread+0x13e/0x160 " "[ 112.418301] [<000000000090a9c2>] kernel_thread_starter+0x6/0xc " "[ 112.418303] [<000000000090a9bc>] kernel_thread_starter+0x0/0xc " "[ 112.418304] kworker/61:1 I 0 450 2 0x00000000 " "[ 112.418305] Call Trace: " "[ 112.418306] ([<0000000000905458>] __schedule+0x398/0x850) " "[ 112.418308] [<000000000090595a>] schedule+0x4a/0xb8 " "[ 112.418309] [<00000000001882ec>] worker_thread+0xe4/0x4f8 " "[ 112.418311] [<000000000018ee66>] kthread+0x13e/0x160 " "[ 112.418312] [<000000000090a9c2>] kernel_thread_starter+0x6/0xc " "[ 112.418313] [<000000000090a9bc>] kernel_thread_starter+0x0/0xc " "[ 112.418315] kworker/63:1 I 0 451 2 0x00000000 " "[ 112.418316] Call Trace: " "[ 112.418318] ([<0000000000905458>] __schedule+0x398/0x850) " "[ 112.418319] [<000000000090595a>] schedule+0x4a/0xb8 " "[ 112.418320] [<00000000001882ec>] worker_thread+0xe4/0x4f8 " "[ 112.418322] [<000000000018ee66>] kthread+0x13e/0x160 " "[ 112.418323] [<000000000090a9c2>] kernel_thread_starter+0x6/0xc " "[ 112.418324] [<000000000090a9bc>] kernel_thread_starter+0x0/0xc " "[ 112.418325] kworker/0:1H I 0 452 2 0x00000000 " "[ 112.418327] Call Trace: " "[ 112.418328] ([<0000000000905458>] __schedule+0x398/0x850) " "[ 112.418329] [<000000000090595a>] schedule+0x4a/0xb8 " "[ 112.418330] [<00000000001882ec>] worker_thread+0xe4/0x4f8 " "[ 112.418332] [<000000000018ee66>] kthread+0x13e/0x160 " "[ 112.418333] [<000000000090a9c2>] kernel_thread_starter+0x6/0xc " "[ 112.418335] [<000000000090a9bc>] kernel_thread_starter+0x0/0xc " "[ 112.418336] jbd2/dasda1-8 S 0 453 2 0x00000000 " "[ 112.418337] Call Trace: " "[ 112.418338] ([<0000000000905458>] __schedule+0x398/0x850) " "[ 112.418339] [<000000000090595a>] schedule+0x4a/0xb8 " "[ 112.418343] [<00000000004725be>] kjournald2+0x386/0x3c8 " "[ 112.418345] [<000000000018ee66>] kthread+0x13e/0x160 " "[ 112.418346] [<000000000090a9c2>] kernel_thread_starter+0x6/0xc " "[ 112.418348] [<000000000090a9bc>] kernel_thread_starter+0x0/0xc " "[ 112.418349] ext4-rsv-conver I 0 454 2 0x00000000 " "[ 112.418350] Call Trace: " "[ 112.418352] ([<0000000000905458>] __schedule+0x398/0x850) " "[ 112.418353] [<000000000090595a>] schedule+0x4a/0xb8 " "[ 112.418354] [<0000000000189008>] rescuer_thread+0x3f8/0x460 " "[ 112.418356] [<000000000018ee66>] kthread+0x13e/0x160 " "[ 112.418357] [<000000000090a9c2>] kernel_thread_starter+0x6/0xc " "[ 112.418358] [<000000000090a9bc>] kernel_thread_starter+0x0/0xc " "[ 112.418360] kworker/62:1H I 0 455 2 0x00000000 " "[ 112.418361] Call Trace: " "[ 112.418362] ([<0000000000905458>] __schedule+0x398/0x850) " "[ 112.418364] [<000000000090595a>] schedule+0x4a/0xb8 " "[ 112.418365] [<00000000001882ec>] worker_thread+0xe4/0x4f8 " "[ 112.418366] [<000000000018ee66>] kthread+0x13e/0x160 " "[ 112.418368] [<000000000090a9c2>] kernel_thread_starter+0x6/0xc " "[ 112.418369] [<000000000090a9bc>] kernel_thread_starter+0x0/0xc " "[ 112.418370] Showing busy workqueues and worker pools: " "[ 112.418407] workqueue events: flags=0x0 " "[ 112.418426] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256 " "[ 112.418429] in-flight: 343:ctrlchar_handle_sysrq " "[ 112.418837] workqueue kblockd: flags=0x18 " "[ 112.418855] pwq 131: cpus=65 node=0 flags=0x4 nice=-20 active=1/256 " "[ 112.418858] pending: blk_mq_run_work_fn " "[ 112.419188] pool 4: cpus=2 node=0 flags=0x0 nice=0 hung=0s workers=2 idle: 20 " On 11/27/2017 04:54 PM, Christoph Hellwig wrote: > Can you try this git branch: > > git://git.infradead.org/users/hch/block.git blk-mq-hotplug-fix > > Gitweb: > > http://git.infradead.org/users/hch/block.git/shortlog/refs/heads/blk-mq-hotplug-fix >
