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SubjectRe: scsi_debug module panic
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[add linux-scsi]

On 7/22/19 4:39 PM, Murphy Zhou wrote:
>
> Hi,
>
> It reproduces every time. It's ok on v5.2. So it's a regression in v5.3-rc1.
>
> Thanks,
> M
>
> [root@7u ~]# modprobe scsi_debug
> [ 244.084203] scsi host2: scsi_debug: version 0188 [20190125]
> [ 244.084203] dev_size_mb=8, opts=0x0, submit_queues=1, statistics=0
> [ 244.093098] BUG: kernel NULL pointer dereference, address: 0000000000000000
> [ 244.097625] #PF: supervisor read access in kernel mode
> [ 244.101175] #PF: error_code(0x0000) - not-present page
> [ 244.104670] PGD 0 P4D 0
> [ 244.106381] Oops: 0000 [#1] SMP PTI
> [ 244.108738] CPU: 17 PID: 182 Comm: kworker/u64:1 Not tainted 5.3.0-rc1-master-5f9e832 #112
> [ 244.114161] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011
> [ 244.117854] Workqueue: events_unbound async_run_entry_fn
> [ 244.121025] RIP: 0010:dma_direct_max_mapping_size+0x2b/0x65
> [ 244.124324] Code: 66 66 66 90 55 53 48 89 fb e8 f1 14 00 00 84 c0 75 0a 5b 48 c7 c0 ff ff ff ff 5d c3 48 8b 83 28 02 00 00 48 8b ab 38 02 00 00 <48> 8b 00 48 89 ea 48 85 c0 74 0f 48 85 d2 48 89 c5 74 07 48 39 d0
> [ 244.135752] RSP: 0018:ffffb3bd40733bf8 EFLAGS: 00010202
> [ 244.139237] RAX: 0000000000000000 RBX: ffffa027feb50c18 RCX: 0000000000000000
> [ 244.143966] RDX: 0000000000000800 RSI: 0000000000000800 RDI: ffffa027feb50c18
> [ 244.148748] RBP: 0000000000000000 R08: 00000000000300e0 R09: ffffa028104dd280
> [ 244.153399] R10: ffffa028104dd280 R11: ffffffffffffffa0 R12: ffffa027feb50c18
> [ 244.157982] R13: 00000000ffffffff R14: ffffa0280513c828 R15: 0000000000000000
> [ 244.162375] FS: 0000000000000000(0000) GS:ffffa02894640000(0000) knlGS:0000000000000000
> [ 244.167286] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 244.170876] CR2: 0000000000000000 CR3: 000000003c20a000 CR4: 00000000000006e0
> [ 244.175116] Call Trace:
> [ 244.176622] __scsi_init_queue+0x7a/0x130
> [ 244.178788] scsi_mq_alloc_queue+0x34/0x50
> [ 244.181015] scsi_alloc_sdev+0x1e4/0x2b0
> [ 244.183150] scsi_probe_and_add_lun+0x8af/0xd60
> [ 244.185628] ? kobject_set_name_vargs+0x6e/0x90
> [ 244.188168] ? dev_set_name+0x53/0x70
> [ 244.190258] ? _cond_resched+0x15/0x30
> [ 244.192416] ? mutex_lock+0xe/0x30
> [ 244.194284] __scsi_scan_target+0xf4/0x250
> [ 244.196527] scsi_scan_channel.part.13+0x52/0x70
> [ 244.198830] scsi_scan_host_selected+0xe3/0x190
> [ 244.201159] ? __switch_to_asm+0x40/0x70
> [ 244.203124] do_scan_async+0x17/0x180
> [ 244.204961] async_run_entry_fn+0x39/0x160
> [ 244.207012] process_one_work+0x171/0x380
> [ 244.209007] worker_thread+0x49/0x3f0
> [ 244.210840] kthread+0xf8/0x130
> [ 244.212419] ? max_active_store+0x80/0x80
> [ 244.214426] ? kthread_bind+0x10/0x10
> [ 244.216264] ret_from_fork+0x35/0x40
> [ 244.218075] Modules linked in: scsi_debug sunrpc snd_hda_codec_generic ledtrig_audio snd_hda_intel snd_hda_codec crct10dif_pclmul snd_hda_core crc32_pclmul snd_hwdep ghash_clmulni_intel snd_seq snd_seq_device snd_pcm aesni_intel crypto_simd snd_timer cryptd snd glue_helper sg pcspkr soundcore joydev virtio_balloon i2c_piix4 ip_tables xfs libcrc32c qxl drm_kms_helper syscopyarea sysfillrect sd_mod sysimgblt fb_sys_fops ttm ata_generic pata_acpi drm virtio_console 8139too ata_piix libata virtio_pci 8139cp virtio_ring crc32c_intel serio_raw mii virtio floppy dm_mirror dm_region_hash dm_log dm_mod
> [ 244.243647] CR2: 0000000000000000
> [ 244.245274] ---[ end trace 1209311dc64cb7fa ]---
> [ 244.247399] RIP: 0010:dma_direct_max_mapping_size+0x2b/0x65
> [ 244.250145] Code: 66 66 66 90 55 53 48 89 fb e8 f1 14 00 00 84 c0 75 0a 5b 48 c7 c0 ff ff ff ff 5d c3 48 8b 83 28 02 00 00 48 8b ab 38 02 00 00 <48> 8b 00 48 89 ea 48 85 c0 74 0f 48 85 d2 48 89 c5 74 07 48 39 d0
> [ 244.258533] RSP: 0018:ffffb3bd40733bf8 EFLAGS: 00010202
> [ 244.260749] RAX: 0000000000000000 RBX: ffffa027feb50c18 RCX: 0000000000000000
> [ 244.263777] RDX: 0000000000000800 RSI: 0000000000000800 RDI: ffffa027feb50c18
> [ 244.266798] RBP: 0000000000000000 R08: 00000000000300e0 R09: ffffa028104dd280
> [ 244.269901] R10: ffffa028104dd280 R11: ffffffffffffffa0 R12: ffffa027feb50c18
> [ 244.272899] R13: 00000000ffffffff R14: ffffa0280513c828 R15: 0000000000000000
> [ 244.275909] FS: 0000000000000000(0000) GS:ffffa02894640000(0000) knlGS:0000000000000000
> [ 244.279131] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 244.281655] CR2: 0000000000000000 CR3: 000000003c20a000 CR4: 00000000000006e0
> [ 244.284554] Kernel panic - not syncing: Fatal exception
> [ 244.287052] Kernel Offset: 0x22c00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
> [ 244.291412] ---[ end Kernel panic - not syncing: Fatal exception ]---
>


--
~Randy

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