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From: Subhashini Rao Beerisetty <subhashbeerisetty@gmail.com>
To: kernelnewbies <kernelnewbies@kernelnewbies.org>
Subject: soft lockup in fb_flashcursor
Date: Fri, 1 Nov 2019 16:06:29 +0530
Message-ID: <CAPY=qRRy6g6qbnfhWQO_4L2rCC9xJiXbJWiG7mB1p8dZjMWk-Q@mail.gmail.com> (raw)

Hi All,

I noticed soft lockup in fb_flashcursor(). What could be the problem?
and how to resolve this?

[ 1061.790322] NMI watchdog: BUG: soft lockup - CPU#1 stuck for 22s!
[kworker/u8:1:2690]
[ 1061.790380] Modules linked in: debug(OE) opabs(OE) gpio(OE) ramoops
reed_solomon ppdev intel_rapl intel_soc_dts_iosf intel_powerclamp
coretemp kvm irqbypass punit_atom_debug nd_pmem nd_btt lpc_ich pci(OE)
cdc_acm mei_txe shpchp mei parport_pc parport 8250_fintek tpm_infineon
mac_hid 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
crct10dif_pclmul crc32_pclmul ghash_clmulni_intel i915 aesni_intel
aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd igb
drm_kms_helper syscopyarea dca sysfillrect ptp sysimgblt
[ 1061.790387]  pps_core fb_sys_fops i2c_algo_bit drm ahci libahci
fjes video [last unloaded: opabs]
[ 1061.790391] CPU: 1 PID: 2690 Comm: kworker/u8:1 Tainted: G
 OE   4.4.0-66-generic #87-Ubuntu
[ 1061.790392] Hardware name: Quanmax Inc. COMM-E380/COMM-E380, BIOS
1.02 08/01/2017
[ 1061.790401] Workqueue: events_power_efficient fb_flashcursor
[ 1061.790403] task: ffff8800b249f2c0 ti: ffff8800b3aa8000 task.ti:
ffff8800b3aa8000
[ 1061.790410] RIP: 0010:[<ffffffff810d8543>]  [<ffffffff810d8543>]
console_unlock+0x313/0x550
[ 1061.790412] RSP: 0000:ffff8800b3aabda0  EFLAGS: 00000246
[ 1061.790413] RAX: 0000000000000000 RBX: 0000000000000246 RCX: 00000000ffffffff
[ 1061.790414] RDX: ffff8800b3aabd18 RSI: 0000000000000004 RDI: 0000000000000246
[ 1061.790416] RBP: ffff8800b3aabdd8 R08: 0000000000000000 R09: 0000000000000000
[ 1061.790417] R10: ffff880034956f00 R11: ffffffffffffffff R12: 0000000000000067
[ 1061.790418] R13: 0000000000000007 R14: ffffffff82115cbc R15: 0000000000000000
[ 1061.790420] FS:  0000000000000000(0000) GS:ffff88013fc80000(0000)
knlGS:0000000000000000
[ 1061.790422] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 1061.790423] CR2: 00007f3f3e5b5000 CR3: 00000000b3420000 CR4: 00000000001006e0
[ 1061.790424] Stack:
[ 1061.790428]  01ff880000000000 ffffffff821503d0 0000000000000720
ffff880035657800
[ 1061.790431]  ffff88013b08c400 0000000000000002 ffffffff81477190
ffff8800b3aabe18
[ 1061.790434]  ffffffff8147103c 000000003fc96dc0 ffff88013a778900
ffff88013b08e800
[ 1061.790435] Call Trace:
[ 1061.790441]  [<ffffffff81477190>] ? update_attr.isra.2+0x90/0x90
[ 1061.790445]  [<ffffffff8147103c>] fb_flashcursor+0x5c/0x110
[ 1061.790449]  [<ffffffff8109a515>] process_one_work+0x165/0x480
[ 1061.790452]  [<ffffffff8109a87b>] worker_thread+0x4b/0x4c0
[ 1061.790455]  [<ffffffff8109a830>] ? process_one_work+0x480/0x480
[ 1061.790458]  [<ffffffff8109a830>] ? process_one_work+0x480/0x480
[ 1061.790460]  [<ffffffff810a0ba8>] kthread+0xd8/0xf0
[ 1061.790463]  [<ffffffff810a0ad0>] ? kthread_create_on_node+0x1e0/0x1e0
[ 1061.790468]  [<ffffffff8183c98f>] ret_from_fork+0x3f/0x70
[ 1061.790470]  [<ffffffff810a0ad0>] ? kthread_create_on_node+0x1e0/0x1e0
[ 1061.790502] Code: 48 8b 7d d0 83 e0 1f 89 05 63 7e 07 01 c6 07 00
0f 1f 40 00 48 c7 c6 a0 d6 10 82 44 89 ef 4c 89 e1 e8 f2 f5 ff ff 48
89 df 57 9d <0f> 1f 44 00 00 8b 45 c8 85 c0 0f 84 6e fd ff ff e8 98 01
76 00


Thanks

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