linux-kernel - [btrfs] 2c54397216: WARNING:at_fs/btrfs/block-group.c:#btrfs_create_pending_block

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Date:   Mon, 23 Dec 2019 21:41:36 +0800
From:   kernel test robot <rong.a.chen@...el.com>
To:     Josef Bacik <josef@...icpanda.com>
Cc:     David Sterba <dsterba@...e.com>, Qu Wenruo <wqu@...e.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>, lkp@...ts.01.org
Subject: [btrfs] 2c54397216:
 WARNING:at_fs/btrfs/block-group.c:#btrfs_create_pending_block_groups[btrfs]

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

commit: 2c54397216ca913d2df97baf2957cf905cb33b64 ("btrfs: kill min_allocable_bytes in inc_block_group_ro")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master

in testcase: xfstests
with following parameters:

	disk: 6HDD
	fs: btrfs
	test: btrfs-group02

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):


+-----------------------------------------------------------------------------+------------+------------+
|                                                                             | bd879386d3 | 2c54397216 |
+-----------------------------------------------------------------------------+------------+------------+
| boot_successes                                                              | 12         | 0          |
| boot_failures                                                               | 0          | 12         |
| WARNING:at_fs/btrfs/block-group.c:#btrfs_create_pending_block_groups[btrfs] | 0          | 12         |
| RIP:btrfs_create_pending_block_groups[btrfs]                                | 0          | 12         |
+-----------------------------------------------------------------------------+------------+------------+


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


[  198.327017] WARNING: CPU: 1 PID: 13361 at fs/btrfs/block-group.c:1876 btrfs_create_pending_block_groups+0x1dc/0x250 [btrfs]
[  198.332369] Modules linked in: btrfs blake2b_generic xor zstd_decompress zstd_compress raid6_pq libcrc32c ext4 mbcache jbd2 dm_mod bochs_drm drm_vram_helper drm_ttm_helper ttm drm_kms_helper intel_rapl_msr intel_rapl_common sr_mod cdrom sg crct10dif_pclmul ata_generic pata_acpi crc32_pclmul crc32c_intel ghash_clmulni_intel snd_pcm syscopyarea sysfillrect sysimgblt ppdev fb_sys_fops snd_timer snd drm soundcore aesni_intel pcspkr crypto_simd joydev cryptd glue_helper serio_raw ata_piix libata i2c_piix4 parport_pc floppy parport ip_tables [last unloaded: blake2b_generic]
[  198.339163] CPU: 1 PID: 13361 Comm: btrfs Not tainted 5.5.0-rc2-00031-g2c54397216ca9 #1
[  198.340479] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[  198.341737] RIP: 0010:btrfs_create_pending_block_groups+0x1dc/0x250 [btrfs]
[  198.342899] Code: e9 58 ff ff ff 48 8b 45 50 f0 48 0f ba a8 38 ce 00 00 02 72 17 41 83 fc fb 74 32 44 89 e6 48 c7 c7 a8 1e 62 c0 e8 14 26 4a e0 <0f> 0b 44 89 e1 ba 54 07 00 00 48 c7 c6 00 01 61 c0 48 89 ef e8 33
[  198.345655] RSP: 0018:ffffa4cbc086fad8 EFLAGS: 00010282
[  198.346708] RAX: 0000000000000000 RBX: ffff92721da17d08 RCX: 0000000000000000
[  198.347950] RDX: 0000000000000001 RSI: ffff92727fd19b38 RDI: ffff92727fd19b38
[  198.349150] RBP: ffff92715aad3d68 R08: 0000000000000644 R09: 0000000000aaaaaa
[  198.350323] R10: ffff92720f8fc8e8 R11: ffff927257aa9750 R12: 00000000ffffffe4
[  198.351546] R13: ffff92715aad3dc0 R14: ffff9272098f0000 R15: ffff92721db3f800
[  198.352786] FS:  00007f8e2e6b68c0(0000) GS:ffff92727fd00000(0000) knlGS:0000000000000000
[  198.353994] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  198.355119] CR2: 0000000002072048 CR3: 00000001d0178000 CR4: 00000000000406e0
[  198.356425] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  198.357676] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  198.358896] Call Trace:
[  198.359949]  btrfs_start_dirty_block_groups+0x3ad/0x540 [btrfs]
[  198.361216]  btrfs_commit_transaction+0x2a8/0xaa0 [btrfs]
[  198.362292]  ? start_transaction+0xba/0x4b0 [btrfs]
[  198.363409]  reset_balance_state+0x15d/0x1a0 [btrfs]
[  198.364607]  btrfs_balance+0x47f/0x6c0 [btrfs]
[  198.365655]  btrfs_ioctl_balance+0x2c2/0x370 [btrfs]
[  198.366716]  btrfs_ioctl+0x153f/0x2f50 [btrfs]
[  198.367755]  ? handle_pte_fault+0x411/0xb70
[  198.368799]  ? _cond_resched+0x19/0x30
[  198.369760]  ? __handle_mm_fault+0x53b/0x660
[  198.370723]  ? cred_has_capability+0x85/0x130
[  198.371732]  ? do_vfs_ioctl+0xa1/0x740
[  198.372708]  ? btrfs_ioctl_get_supported_features+0x30/0x30 [btrfs]
[  198.373758]  do_vfs_ioctl+0xa1/0x740
[  198.374655]  ? handle_mm_fault+0xdd/0x210
[  198.375626]  ksys_ioctl+0x70/0x80
[  198.376545]  __x64_sys_ioctl+0x16/0x20
[  198.377504]  do_syscall_64+0x5b/0x1f0
[  198.378415]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  198.379451] RIP: 0033:0x7f8e2d73e017
[  198.380413] Code: 00 00 00 48 8b 05 81 7e 2b 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 51 7e 2b 00 f7 d8 64 89 01 48
[  198.383120] RSP: 002b:00007ffe6f498f98 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
[  198.384387] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f8e2d73e017
[  198.385616] RDX: 00007ffe6f499028 RSI: 00000000c4009420 RDI: 0000000000000004
[  198.386803] RBP: 00007ffe6f499028 R08: 000000000206a000 R09: 0000000000000000
[  198.388013] R10: 0000000000000541 R11: 0000000000000202 R12: 0000000000000004
[  198.389126] R13: 00007ffe6f49bb97 R14: 0000000000000003 R15: 0000000000000000
[  198.390220] ---[ end trace 910e18c1102a58da ]---


To reproduce:

        # build kernel
	cd linux
	cp config-5.5.0-rc2-00031-g2c54397216ca9 .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,
Rong Chen


View attachment "config-5.5.0-rc2-00031-g2c54397216ca9" of type "text/plain" (202395 bytes)

View attachment "job-script" of type "text/plain" (5493 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (42020 bytes)

View attachment "xfstests" of type "text/plain" (7228 bytes)