Message-ID: <20191108082244.GA29418@shao2-debian>
Date:   Fri, 8 Nov 2019 16:22:44 +0800
From:   kernel test robot <lkp@...el.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Jens Axboe <axboe@...nel.dk>, LKML <linux-kernel@...r.kernel.org>,
        Jens Axboe <axboe@...com>, lkp@...ts.01.org
Subject: [block] fa53228721: WARNING:at_block/blk-merge.c:#blk_rq_map_sg

FYI, we noticed the following commit (built with gcc-7):

commit: fa53228721876515adabc7bc74368490bd97aa3b ("block: avoid blk_bio_segment_split for small I/O operations")
https://git.kernel.org/cgit/linux/kernel/git/axboe/linux-block.git for-5.5/block

in testcase: xfstests
with following parameters:

	disk: 4HDD
	fs: xfs
	test: xfs-group16

test-description: xfstests is a regression test suite for xfs and other files ystems.
test-url: git://git.kernel.org/pub/scm/fs/xfs/xfstests-dev.git


on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 8G

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):


+---------------------------------------------+------------+------------+
|                                             | d2c9be89f8 | fa53228721 |
+---------------------------------------------+------------+------------+
| boot_successes                              | 12         | 0          |
| boot_failures                               | 0          | 16         |
| WARNING:at_block/blk-merge.c:#blk_rq_map_sg | 0          | 16         |
| RIP:blk_rq_map_sg                           | 0          | 16         |
| kernel_BUG_at_drivers/scsi/scsi_lib.c       | 0          | 16         |
| invalid_opcode:#[##]                        | 0          | 16         |
| RIP:scsi_init_io                            | 0          | 16         |
| Kernel_panic-not_syncing:Fatal_exception    | 0          | 16         |
+---------------------------------------------+------------+------------+


If you fix the issue, kindly add following tag
Reported-by: kernel test robot <lkp@...el.com>


[  203.892883] WARNING: CPU: 0 PID: 443 at block/blk-merge.c:559 blk_rq_map_sg+0x649/0x700
[  203.897634] Modules linked in: sd_mod scsi_debug xfs libcrc32c dm_mod sr_mod cdrom intel_rapl_msr intel_rapl_common sg ata_generic pata_acpi crct10dif_pclmul crc32_pclmul crc32c_intel bochs_drm ppdev drm_vram_helper ghash_clmulni_intel ttm drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops snd_pcm drm snd_timer snd aesni_intel crypto_simd ata_piix cryptd glue_helper soundcore joydev pcspkr serio_raw libata i2c_piix4 floppy parport_pc parport ip_tables
[  203.910875] CPU: 0 PID: 443 Comm: kworker/0:1H Not tainted 5.4.0-rc2-00027-gfa53228721876 #7
[  203.913336] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[  203.915809] Workqueue: kblockd blk_mq_run_work_fn
[  203.917547] RIP: 0010:blk_rq_map_sg+0x649/0x700
[  203.919306] Code: 0f 84 83 fb ff ff f7 d0 21 d0 83 c0 01 01 41 0c 01 86 cc 00 00 00 e9 6e fb ff ff 48 8b 04 24 4c 89 e1 8b 40 1c e9 56 fb ff ff <0f> 0b e9 5d fc ff ff 0f 0b 0f 0b 0f 0b 80 3d cf 5b 3b 01 00 74 09
[  203.924618] RSP: 0018:ffffb420403c3bd8 EFLAGS: 00010202
[  203.926540] RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffff8f4f5fe49800
[  203.928780] RDX: 0000000000001000 RSI: ffff8f4f31832400 RDI: ffffb4204035fb60
[  203.931084] RBP: ffff8f4f5ed641c0 R08: ffff8f4f5ed641c0 R09: 0000000000000600
[  203.933389] R10: 0000000000001000 R11: 0000000000001000 R12: ffff8f4f5fe49800
[  203.935687] R13: 0000000000000002 R14: 0000000000000600 R15: 0000000000000000
[  203.937962] FS:  0000000000000000(0000) GS:ffff8f4fbfc00000(0000) knlGS:0000000000000000
[  203.940416] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  203.942414] CR2: 000056365d914000 CR3: 0000000228cb6000 CR4: 00000000000406f0
[  203.944683] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  203.946992] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  203.949261] Call Trace:
[  203.951375]  scsi_init_io+0x66/0x170
[  203.952941]  sd_init_command+0x192/0xac0 [sd_mod]
[  203.954775]  scsi_queue_rq+0x597/0xac0
[  203.956361]  blk_mq_dispatch_rq_list+0x3da/0x5b0
[  203.958160]  ? syscall_return_via_sysret+0x10/0x7f
[  203.959984]  ? __switch_to_asm+0x40/0x70
[  203.961606]  ? __switch_to_asm+0x34/0x70
[  203.963263]  ? elv_rb_del+0x1f/0x30
[  203.964810]  ? deadline_remove_request+0x55/0xc0
[  203.966618]  blk_mq_do_dispatch_sched+0x76/0x120
[  203.968365]  blk_mq_sched_dispatch_requests+0x100/0x170
[  203.970222]  __blk_mq_run_hw_queue+0x60/0x130
[  203.971930]  process_one_work+0x1ae/0x3d0
[  203.973539]  worker_thread+0x3c/0x3b0
[  203.975115]  ? process_one_work+0x3d0/0x3d0
[  203.976737]  kthread+0x11e/0x140
[  203.978206]  ? kthread_park+0x90/0x90
[  203.979727]  ret_from_fork+0x35/0x40
[  203.981236] ---[ end trace a0fde01679c74e77 ]---


To reproduce:

        # build kernel
	cd linux
	cp config-5.4.0-rc2-00027-gfa53228721876 .config
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage modules
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 INSTALL_MOD_PATH=<mod-install-dir> modules_install
	cd <mod-install-dir>
	find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz


        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> -m modules.cgz job-script # job-script is attached in this email



Thanks,
lkp


View attachment "config-5.4.0-rc2-00027-gfa53228721876" of type "text/plain" (200609 bytes)

View attachment "job-script" of type "text/plain" (5475 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (20068 bytes)

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