Device is OK with 4.12, however, with 4.12 we get another issue:
[ 3996.652718] INFO: rcu_sched self-detected stall on CPU
[ 3996.652730] 23-...: (1 GPs behind) idle=73a/140000000000002/0
softirq=5179/5179 fqs=2475
[ 3996.652735] (t=5250 jiffies g=6889 c=6888 q=189)
[ 3996.652748] Task dump for CPU 23:
[ 3996.652749] kopald S 0 975 2 0x00000804
[ 3996.652752] Call Trace:
[ 3996.652759] [c000000fefafb0b0] [c000000000135a24] sched_show_task+0xd4/0x150
(unreliable)
[ 3996.652763] [c000000fefafb120] [c000000000c36b3c]
rcu_dump_cpu_stacks+0xd0/0x134
[ 3996.652767] [c000000fefafb170] [c0000000001867a0]
rcu_check_callbacks+0x8a0/0xb10
[ 3996.652769] [c000000fefafb2a0] [c000000000192958]
update_process_times+0x48/0x90
[ 3996.652773] [c000000fefafb2d0] [c0000000001a9f60]
tick_sched_handle.isra.8+0x30/0xb0
[ 3996.652775] [c000000fefafb300] [c0000000001aa044] tick_sched_timer+0x64/0xd0
[ 3996.652778] [c000000fefafb340] [c000000000193424]
__hrtimer_run_queues+0x144/0x370
[ 3996.652780] [c000000fefafb3c0] [c00000000019449c]
hrtimer_interrupt+0xfc/0x350
[ 3996.652784] [c000000fefafb490] [c000000000024658]
__timer_interrupt+0x88/0x250
[ 3996.652787] [c000000fefafb4e0] [c000000000024a30] timer_interrupt+0x90/0xe0
[ 3996.652791] [c000000fefafb510] [c00000000000b6e0]
restore_check_irq_replay+0x54/0x70
[ 3996.652795] --- interrupt: 901 at arch_local_irq_restore+0x74/0x90
LR = arch_local_irq_restore+0x74/0x90
[ 3996.652797] [c000000fefafb800] [c000000000194530]
hrtimer_interrupt+0x190/0x350 (unreliable)
[ 3996.652801] [c000000fefafb820] [c000000000c3298c] __do_softirq+0xcc/0x41c
[ 3996.652804] [c000000fefafb900] [c0000000000fafa8] irq_exit+0xe8/0x120
[ 3996.652807] [c000000fefafb920] [c000000000024a34] timer_interrupt+0x94/0xe0
[ 3996.652810] [c000000fefafb950] [c00000000000b6e0]
restore_check_irq_replay+0x54/0x70
[ 3996.652815] --- interrupt: 901 at lock_timer_base+0x70/0x100
LR = schedule_timeout+0x334/0x420
[ 3996.652817] [c000000fefafbc40] [0000000000000001] 0x1 (unreliable)
[ 3996.652821] [c000000fefafbca0] [c000000000c30a14]
schedule_timeout+0x334/0x420
[ 3996.652824] [c000000fefafbd80] [c000000000095bf0] kopald+0x90/0xe0
[ 3996.652827] [c000000fefafbdc0] [c0000000001214cc] kthread+0x1ac/0x1c0
[ 3996.652831] [c000000fefafbe30] [c00000000000b2e8]
ret_from_kernel_thread+0x5c/0x74
[ 4000.060643] NMI watchdog: BUG: soft lockup - CPU#23 stuck for 23s!
[kopald:975]
[ 4000.060653] Modules linked in: kvm_hv kvm_pr kvm cuse userio hci_vhci
bluetooth ecdh_generic uhid hid vhost_net vhost tap snd_seq snd_seq_device
snd_timer snd soundcore powernv_op_panel uio_pdrv_genirq ipmi_powernv
ipmi_devintf powernv_rng leds_powernv ibmpowernv vmx_crypto ipmi_msghandler uio
ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi
scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov
async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0
multipath linear dm_round_robin ses enclosure scsi_transport_sas
crct10dif_vpmsum crc32c_vpmsum tg3 ipr scsi_dh_emc scsi_dh_rdac scsi_dh_alua
dm_multipath
[ 4000.060735] CPU: 23 PID: 975 Comm: kopald Not tainted 4.12.0-11-generic #12
[ 4000.060737] task: c000000fefa5b800 task.stack: c000000fefaf8000
[ 4000.060739] NIP: c0000000000165f4 LR: c0000000000165f4 CTR: c000000000024200
[ 4000.060740] REGS: c000000fefafb580 TRAP: 0901 Not tainted
(4.12.0-11-generic)
[ 4000.060741] MSR: 9000000000009033 <SF,HV,EE,ME,IR,DR,RI,LE>
[ 4000.060748] CR: 28000224 XER: 20000000
[ 4000.060749] CFAR: c000000000024a30 SOFTE: 1
GPR00: c000000000c3298c c000000fefafb800 c0000000015a8e00
0000000000000900
GPR04: c000000fffac0400 0000000000000000 0000000001f4024e
c000000fefa5b800
GPR08: 0000000000000000 c000000fefaf8000 0000000000000000
0000000000000005
GPR12: c0000000000920b8 c00000000facf180
[ 4000.060764] NIP [c0000000000165f4] arch_local_irq_restore+0x74/0x90
[ 4000.060766] LR [c0000000000165f4] arch_local_irq_restore+0x74/0x90
[ 4000.060767] Call Trace:
[ 4000.060769] [c000000fefafb800] [c000000000194530]
hrtimer_interrupt+0x190/0x350 (unreliable)
[ 4000.060773] [c000000fefafb820] [c000000000c3298c] __do_softirq+0xcc/0x41c
[ 4000.060776] [c000000fefafb900] [c0000000000fafa8] irq_exit+0xe8/0x120
[ 4000.060779] [c000000fefafb920] [c000000000024a34] timer_interrupt+0x94/0xe0
[ 4000.060782] [c000000fefafb950] [c00000000000b6e0]
restore_check_irq_replay+0x54/0x70
[ 4000.060787] --- interrupt: 901 at lock_timer_base+0x70/0x100
LR = schedule_timeout+0x334/0x420
[ 4000.060788] [c000000fefafbc40] [0000000000000001] 0x1 (unreliable)
[ 4000.060791] [c000000fefafbca0] [c000000000c30a14]
schedule_timeout+0x334/0x420
[ 4000.060795] [c000000fefafbd80] [c000000000095bf0] kopald+0x90/0xe0
[ 4000.060798] [c000000fefafbdc0] [c0000000001214cc] kthread+0x1ac/0x1c0
[ 4000.060801] [c000000fefafbe30] [c00000000000b2e8]
ret_from_kernel_thread+0x5c/0x74
[ 4000.060802] Instruction dump:
[ 4000.060804] 994d02ba 2fa30000 409e0024 e92d0020 61298000 7d210164 38210020
e8010010
[ 4000.060810] 7c0803a6 4e800020 60420000 4bff3f35 <60000000> 4bffffe4 60420000
e92d0020
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https://bugs.launchpad.net/bugs/1711401
Title:
accessing /dev/hvc1 with stress-ng on Ubuntu xenia causes crash
Status in linux package in Ubuntu:
In Progress
Bug description:
stress-ng run as root, --dev stressor, accessing /dev/hvc1:
[ 2096.476610] hvc_open: request_irq failed with rc -16.
[ 2096.476634] Unable to handle kernel paging request for data at address
0x000000a8
[ 2096.476641] Faulting instruction address: 0xc000000000b0d8a4
[ 2096.476647] Oops: Kernel access of bad area, sig: 11 [#1]
[ 2096.476650] SMP NR_CPUS=2048 NUMA PowerNV
[ 2096.476657] Modules linked in: kvm_hv kvm_pr kvm cuse userio hci_vhci
bluetooth uhid hid vhost_net vhost macvtap macvlan snd_seq snd_seq_device
snd_timer snd soundcore ipmi_powernv ipmi_msghandler vmx_crypto leds_powernv
uio_pdrv_genirq uio powernv_rng ibmpowernv ib_iser rdma_cm iw_cm ib_cm ib_sa
ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi
autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor
async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear dm_round_robin ses
enclosure ipr scsi_dh_emc scsi_dh_rdac scsi_dh_alua dm_multipath
[ 2096.476718] CPU: 74 PID: 23074 Comm: stress-ng-dev Not tainted
4.4.0-92-generic #115-Ubuntu
[ 2096.476724] task: c000000fe8499030 ti: c000000f0fa0c000 task.ti:
c000000f0fa0c000
[ 2096.476728] NIP: c000000000b0d8a4 LR: c00000000069648c CTR:
c000000000696450
[ 2096.476732] REGS: c000000f0fa0f6b0 TRAP: 0300 Not tainted
(4.4.0-92-generic)
[ 2096.476736] MSR: 9000000000009033 <SF,HV,EE,ME,IR,DR,RI,LE> CR: 24444248
XER: 00000000
[ 2096.476749] CFAR: c000000000008468 DAR: 00000000000000a8 DSISR: 40000000
SOFTE: 0
GPR00: c00000000069648c c000000f0fa0f930 c0000000015f8000
00000000000000a8
GPR04: c000000ff0082400 0000000000000002 0000001ffe7d0000
0000000000000036
GPR08: c000000003236b90 0000000000000000 000000008000004a
c000001e4e568880
GPR12: c000000000696450 c00000000fb6bf00 000000000000000f
0000010023d22660
GPR16: 00003fff9ca50000 0000000000800000 c000001e43dde100
c000000fe459c800
GPR20: 0000000000000000 0000000000000001 000000000e500001
0000000000010004
GPR24: 0000000000010800 ffffffffffffffff fffffffffffff000
c000000001892448
GPR28: c000000fef98da28 c000000fe459c800 0000000000000001
00000000000000a8
[ 2096.476805] NIP [c000000000b0d8a4] _raw_spin_lock_irqsave+0x44/0x130
[ 2096.476812] LR [c00000000069648c] hvc_open+0x3c/0x1a0
[ 2096.476815] Call Trace:
[ 2096.476818] [c000000f0fa0f930] [c000000f0fa0f970] 0xc000000f0fa0f970
(unreliable)
[ 2096.476824] [c000000f0fa0f970] [c00000000069648c] hvc_open+0x3c/0x1a0
[ 2096.476829] [c000000f0fa0f9f0] [c00000000066c514] tty_open+0x194/0x7c0
[ 2096.476836] [c000000f0fa0fa90] [c0000000002ec234] chrdev_open+0x114/0x270
[ 2096.476841] [c000000f0fa0faf0] [c0000000002e1480]
do_dentry_open+0x2c0/0x460
[ 2096.476846] [c000000f0fa0fb50] [c0000000002f9aa8] do_last+0x178/0xff0
[ 2096.476851] [c000000f0fa0fc10] [c0000000002fab3c] path_openat+0xcc/0x3c0
[ 2096.476857] [c000000f0fa0fc90] [c0000000002fca5c] do_filp_open+0xfc/0x170
[ 2096.476861] [c000000f0fa0fdb0] [c0000000002e3270] do_sys_open+0x1c0/0x3b0
[ 2096.476867] [c000000f0fa0fe30] [c000000000009204] system_call+0x38/0xb4
[ 2096.476870] Instruction dump:
[ 2096.476873] fbe1fff8 f8010010 f821ffc1 7c7f1b78 60000000 60000000 39200000
8bcd02ca
[ 2096.476881] 992d02ca 39400000 994d02cc 814d0008 <7d20f829> 2c090000
40c20010 7d40f92d
[ 2096.476893] ---[ end trace c902066e4cc54f9e ]---
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