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SubjectRe: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with virtio-blk (also 4.12 stable)
From
Date
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@linux.it>
"
"[ 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@redhat.com
"
"[ 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
>

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