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Subject4.15.14 crash with iscsi target and dvd
I reported this before but noone responded.

I have an iscsi target setup with /dev/sr[012] using pscsi. On the
initiator, I mount only 1 disc. Then I issue find -type f | xargs cat >
/dev/null Then after a few seconds, I get 2 oops and the system has to be
hard reset.

I noticed if I cat /dev/sr1 from the initiator, it doesn't crash. I was
also able to burn without crashing.

Here's the OOPS:
[2692.733468] WARNING: CPU: 8 PID: 0 at /usr/src/linux/dist/4.15.14-nobklcd/drivers/scsi/scsi_lib.c:1068 scsi_init_io+0x111/0x1a0 [scsi_mod]
[2692.734154] Modules linked in: dm_thin_pool dm_persistent_data dm_bio_prison dm_bufio raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c crc32c_generic md_mod dm_crypt algif_skcipher af_alg dm_mod dax ext4 crc16 mbcache jbd2 af_packet iscsi_target_mod tcm_loop vhost_scsi vhost target_core_file target_core_iblock target_core_pscsi target_core_mod nfsd exportfs dummy bridge stp llc ib_iser rdma_cm iw_cm ib_cm ib_core ipv6 iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi netconsole configfs sr_mod cdrom adt7475 hwmon_vid sd_mod sg coretemp x86_pkg_temp_thermal kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel pcbc snd_hda_codec_realtek snd_hda_codec_generic nouveau video led_class drm_kms_helper cfbfillrect syscopyarea cfbimgblt
[2692.737388] sysfillrect sysimgblt snd_hda_intel fb_sys_fops cfbcopyarea snd_hda_codec ttm snd_hda_core snd_pcm_oss drm snd_mixer_oss agpgart snd_pcm igb snd_timer snd aesni_intel soundcore hwmon aes_x86_64 i2c_algo_bit ahci mpt3sas crypto_simd i2c_core libahci glue_helper mptsas raid_class libata mptscsih scsi_transport_sas mptbase scsi_mod wmi button unix
[2692.737388] CPU: 8 PID: 0 Comm: swapper/8 Not tainted 4.15.14 #1
[2692.737388] Hardware name: Dell Inc. Precision T5610/0WN7Y6, BIOS A16 02/05/2018
[2692.737388] RIP: 0010:scsi_init_io+0x111/0x1a0 [scsi_mod]
[2692.737388] RSP: 0018:ffff8806b7a03d78 EFLAGS: 00010046
[2692.737388] RAX: 0000000000000000 RBX: ffff8806aa4a9c00 RCX: 0000000000000000
[2692.737388] RDX: 0000000000000000 RSI: ffff8806aa4a9c00 RDI: ffff8806aa4a9d48
[2692.737388] RBP: ffff8806aa4a9d48 R08: 0000000000000000 R09: ffff8806aa4a9d80
[2692.737388] R10: ffff8806ab949088 R11: 0000000000000000 R12: ffff8806b29bb000
[2692.737388] R13: 0000000000000000 R14: ffff8806b29bb000 R15: ffff8806ac4f6950
[2692.737388] FS: 0000000000000000(0000) GS:ffff8806b7a00000(0000) knlGS:0000000000000000
[2692.737388] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[2692.737388] CR2: 00007f1359a8b756 CR3: 0000000001c09003 CR4: 00000000001606e0
[2692.737388] Call Trace:
[2692.737388] <IRQ>
[2692.737388] ? scsi_setup_cmnd+0xb3/0x140 [scsi_mod]
[2692.737388] ? scsi_prep_fn+0x53/0x130 [scsi_mod]
[2692.737388] ? blk_peek_request+0x136/0x220
[2692.737388] ? scsi_request_fn+0x2b/0x510 [scsi_mod]
[2692.737388] ? __blk_run_queue+0x34/0x50
[2692.737388] ? blk_run_queue+0x26/0x40
[2692.737388] ? scsi_run_queue+0x229/0x2b0 [scsi_mod]
[2692.737388] ? scsi_io_completion+0x3ce/0x5a0 [scsi_mod]
[2692.737388] ? blk_done_softirq+0x67/0x80
[2692.737388] ? __do_softirq+0xdb/0x1dd
[2692.737388] ? irq_exit+0xa3/0xb0
[2692.737388] ? do_IRQ+0x45/0xc0
[2692.737388] ? common_interrupt+0x77/0x77
[2692.737388] </IRQ>
[2692.737388] ? cpuidle_enter_state+0x124/0x200
[2692.737388] ? cpuidle_enter_state+0x119/0x200
[2692.737388] ? do_idle+0xdc/0x180
[2692.737388] ? cpu_startup_entry+0x14/0x20
[2692.737388] ? secondary_startup_64+0xa5/0xb0
[2692.737388] Code: 8b 7b 30 e8 d2 6b 20 e1 49 8b 17 4c 89 ff 89 c6 89 44 24 04 e8 81 81 22 e1 85 c0 41 89 c4 74 55 41 bc 02 00 00 00 e9 39 ff ff ff <0f> 0b 41 bc 01 00 00 00 e9 2c ff ff ff 48 8b 3d 6b dc 00 00 be
[2692.737388] ---[ end trace 9801970f9b249e10 ]---
[2692.737388] ------------[ cut here ]------------
[2692.737388] kernel BUG at /usr/src/linux/dist/4.15.14-nobklcd/block/blk-core.c:3235!
[2692.737388] invalid opcode: 0000 [#1] PREEMPT SMP
[2692.737388] Modules linked in: dm_thin_pool dm_persistent_data dm_bio_prison dm_bufio raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c crc32c_generic md_mod dm_crypt algif_skcipher af_alg dm_mod dax ext4 crc16 mbcache jbd2 af_packet iscsi_target_mod tcm_loop vhost_scsi vhost target_core_file target_core_iblock target_core_pscsi target_core_mod nfsd exportfs dummy bridge stp llc ib_iser rdma_cm iw_cm ib_cm ib_core ipv6 iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi netconsole configfs sr_mod cdrom adt7475 hwmon_vid sd_mod sg coretemp x86_pkg_temp_thermal kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel pcbc snd_hda_codec_realtek snd_hda_codec_generic nouveau video led_class drm_kms_helper cfbfillrect syscopyarea cfbimgblt
[2692.737388] sysfillrect sysimgblt snd_hda_intel fb_sys_fops cfbcopyarea snd_hda_codec ttm snd_hda_core snd_pcm_oss drm snd_mixer_oss agpgart snd_pcm igb snd_timer snd aesni_intel soundcore hwmon aes_x86_64 i2c_algo_bit ahci mpt3sas crypto_simd i2c_core libahci glue_helper mptsas raid_class libata mptscsih scsi_transport_sas mptbase scsi_mod wmi button unix
[2692.737388] CPU: 8 PID: 0 Comm: swapper/8 Tainted: G W 4.15.14 #1
[2692.737388] Hardware name: Dell Inc. Precision T5610/0WN7Y6, BIOS A16 02/05/2018
[2692.737388] RIP: 0010:__blk_end_request_all+0x50/0x60
[2692.737388] RSP: 0018:ffff8806b7a03df8 EFLAGS: 00010002
[2692.737388] RAX: 0000000000000001 RBX: ffff8806ac4f6950 RCX: 0000000000000000
[2692.737388] RDX: 0000000000000001 RSI: ffff8806ac36a480 RDI: 0000000000000000
[2692.737388] RBP: 0000000000000001 R08: 0000000000000000 R09: ffff8806aa4a9d80
[2692.737388] R10: ffff8806ab949088 R11: 0000000000000000 R12: ffff8806aa4a9c00
[2692.737388] R13: ffff8806ac4f6950 R14: 0000000000000246 R15: ffff8806ac4f6950
[2692.737388] FS: 0000000000000000(0000) GS:ffff8806b7a00000(0000) knlGS:0000000000000000
[2692.737388] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[2692.737388] CR2: 00007f1359a8b756 CR3: 0000000001c09003 CR4: 00000000001606e0
[2692.737388] Call Trace:
[2692.737388] <IRQ>
[2692.737388] ? blk_peek_request+0x173/0x220
[2692.737388] ? scsi_request_fn+0x2b/0x510 [scsi_mod]
[2692.737388] ? __blk_run_queue+0x34/0x50
[2692.737388] ? blk_run_queue+0x26/0x40
[2692.737388] ? scsi_run_queue+0x229/0x2b0 [scsi_mod]
[2692.737388] ? scsi_io_completion+0x3ce/0x5a0 [scsi_mod]
[2692.737388] ? blk_done_softirq+0x67/0x80
[2692.737388] ? __do_softirq+0xdb/0x1dd
[2692.737388] ? irq_exit+0xa3/0xb0
[2692.737388] ? do_IRQ+0x45/0xc0
[2692.737388] ? common_interrupt+0x77/0x77
[2692.737388] </IRQ>
[2692.737388] ? cpuidle_enter_state+0x124/0x200
[2692.737388] ? cpuidle_enter_state+0x119/0x200
[2692.737388] ? do_idle+0xdc/0x180
[2692.737388] ? cpu_startup_entry+0x14/0x20
[2692.737388] ? secondary_startup_64+0xa5/0xb0
[2692.737388] Code: ff ff ff 84 c0 75 24 c3 0f 0b 48 8b 87 40 01 00 00 31 c9 48 85 c0 74 df 8b 48 58 40 0f b6 f6 8b 57 58 e8 04 ff ff ff 84 c0 74 dc <0f> 0b 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 41 54 55 53 48
[2692.737388] RIP: __blk_end_request_all+0x50/0x60 RSP: ffff8806b7a03df8
[2692.737388] ---[ end trace 9801970f9b249e11 ]---
[2692.737388] Kernel panic - not syncing: Fatal exception in interrupt
[2692.737388] Kernel Offset: disabled
[2692.737388] ---[ end Kernel panic - not syncing: Fatal exception in interrupt

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