[dm-devel] Kernel error at a LVM snapshot creation

Dmitrij Gusev dmitrij at gusev.co
Mon Sep 2 01:04:47 UTC 2019


Hello.

I get a kernel error every time I create LVM snapshot - at the creation 
and at boot time, though the snapshot itself is working properly.

Linux nexus 4.19.69 #2 SMP Thu Aug 29 16:33:35 CDT 2019 x86_64 Intel(R) 
Xeon(R) E-2174G CPU @ 3.80GHz GenuineIntel GNU/Linux

At boot log:

[   17.160402] ------------[ cut here ]------------
[   17.160900] generic_make_request: Trying to write to read-only 
block-device dm-4 (partno 0)
[   17.161424] WARNING: CPU: 3 PID: 941 at block/blk-core.c:2176 
generic_make_request_checks+0x28d/0x6a0
[   17.161935] Modules linked in: fuse hid_generic usbhid hid i2c_dev 
mei_wdt eeepc_wmi asus_wmi evdev sparse_keymap rfkill wmi_bmof 
snd_hda_codec_hdmi coretemp snd_hda_codec_realtek intel_rapl 
snd_hda_codec_generic x86_pkg_temp_thermal intel_powerclamp kvm_intel 
crct10dif_pclmul crc32_pclmul i915 crc32c_intel ghash_clmulni_intel 
intel_cstate snd_hda_intel snd_hda_codec kvmgt vfio_mdev intel_rapl_perf 
mdev vfio_iommu_type1 vfio kvm snd_hda_core snd_hwdep igb snd_pcm 
snd_timer snd e1000e soundcore irqbypass cec rc_core hwmon dca i2c_i801 
drm_kms_helper drm intel_gtt agpgart thermal fan i2c_algo_bit 
fb_sys_fops syscopyarea sysfillrect sysimgblt i2c_core video mei_me mei 
xhci_pci xhci_hcd button pcc_cpufreq wmi acpi_pad acpi_tad loop 
dm_snapshot dm_bufio ext4 mbcache jbd2
[   17.165955] CPU: 3 PID: 941 Comm: kworker/3:3 Not tainted 4.19.69 #2
[   17.166464] Hardware name: ASUSTeK COMPUTER INC. System Product 
Name/WS C246 PRO, BIOS 1003 06/04/2019
[   17.166952] Workqueue: kcopyd do_work
[   17.167467] RIP: 0010:generic_make_request_checks+0x28d/0x6a0
[   17.167952] Code: 5c 03 00 00 48 89 ef 48 8d 74 24 08 c6 05 11 47 f3 
00 01 e8 55 60 01 00 48 c7 c7 d0 5d 08 bd 48 89 c6 44 89 e2 e8 22 cd cc 
ff <0f> 0b 4c 8b 65 08 8b 45 30 c1 e8 09 49 8b 74 24 50 85 c0 0f 84 5f
[   17.169020] RSP: 0018:ffff9df3c400faf8 EFLAGS: 00010282
[   17.169533] RAX: 0000000000000000 RBX: ffff927c05350988 RCX: 
0000000000000311
[   17.170049] RDX: 0000000000000001 RSI: 0000000000000082 RDI: 
0000000000000246
[   17.170562] RBP: ffff927c06a64900 R08: 0000000000000000 R09: 
0000000000000311
[   17.171106] R10: 0000000000aaaaaa R11: 0000000000000000 R12: 
0000000000000000
[   17.171616] R13: 0000000000000000 R14: 0000000000001000 R15: 
ffff927c05472b80
[   17.172130] FS:  0000000000000000(0000) GS:ffff927c0bb80000(0000) 
knlGS:0000000000000000
[   17.172646] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   17.173191] CR2: 00007f40a05f9ff0 CR3: 000000015a20a004 CR4: 
00000000003606e0
[   17.173711] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
[   17.174238] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 
0000000000000400
[   17.174752] Call Trace:
[   17.175279]  ? kmem_cache_alloc+0x37/0x1c0
[   17.175771]  generic_make_request+0x5b/0x400
[   17.176247]  submit_bio+0x43/0x130
[   17.176726]  ? bio_add_page+0x48/0x60
[   17.177195]  dispatch_io+0x1c8/0x460
[   17.177689]  ? dm_hash_remove_all.cold+0x21/0x21
[   17.178168]  ? list_get_page+0x30/0x30
[   17.178624]  ? dm_kcopyd_do_callback+0x40/0x40
[   17.179102]  dm_io+0x11c/0x210
[   17.179545]  ? dm_hash_remove_all.cold+0x21/0x21
[   17.179990]  ? list_get_page+0x30/0x30
[   17.180429]  run_io_job+0xd4/0x1c0
[   17.180863]  ? dm_kcopyd_do_callback+0x40/0x40
[   17.181293]  ? dm_kcopyd_client_destroy+0x140/0x140
[   17.181719]  process_jobs+0x82/0x1b0
[   17.182147]  do_work+0xb9/0xf0
[   17.182570]  process_one_work+0x1ba/0x3d0
[   17.182992]  worker_thread+0x4d/0x3d0
[   17.183441]  ? process_one_work+0x3d0/0x3d0
[   17.183857]  kthread+0x117/0x130
[   17.184270]  ? kthread_create_worker_on_cpu+0x70/0x70
[   17.184680]  ret_from_fork+0x35/0x40
[   17.185082] ---[ end trace f01c6b7a501faa64 ]---

Best regards,

Dmitrij Gusev







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