linux-kernel - WARNING in loop

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Message-ID: <CACkBjsabd_SguR27OoZH85SbN7gRFcxTYK+POyHSn9xrzZ9fOA@mail.gmail.com>
Date:   Fri, 3 Sep 2021 15:36:51 +0800
From:   Hao Sun <sunhao.th@...il.com>
To:     axboe@...nel.dk, linux-block@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: WARNING in loop_add

Hello,

When using Healer to fuzz the latest Linux kernel, the following crash
was triggered.

HEAD commit: 7d2a07b76933 Linux 5.14
git tree: upstream
console output:
https://drive.google.com/file/d/1lL94fy2uAtUMlfTnDDI6ooGLUGGvlDwl/view?usp=sharing
kernel config: https://drive.google.com/file/d/1XD9WYDViQLSXN7RGwH8AGGDvP9JvOghx/view?usp=sharing
C reproducer: https://drive.google.com/file/d/12LXTfEg30h-Y6s5smCLIP7Jtr3g6PFOK/view?usp=sharing
Syzlang reproducer:
https://drive.google.com/file/d/1mUCxjzeD5w2bOjuw80srDBwpCh0zSpdW/view?usp=sharing

If you fix this issue, please add the following tag to the commit:
Reported-by: Hao Sun <sunhao.th@...il.com>

oop4: detected capacity change from 0 to 20480
ISOFS: Unable to identify CD-ROM format.
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 10131 Comm: syz-executor Not tainted 5.14.0 #25
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x8b/0xb3 lib/dump_stack.c:105
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail.cold+0x5/0xa lib/fault-inject.c:146
 should_failslab+0x5/0x10 mm/slab_common.c:1326
 slab_pre_alloc_hook mm/slab.h:494 [inline]
 slab_alloc_node mm/slub.c:2880 [inline]
 slab_alloc mm/slub.c:2967 [inline]
 kmem_cache_alloc_trace+0x62/0x350 mm/slub.c:2984
 kmalloc include/linux/slab.h:591 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 device_create_groups_vargs+0x8a/0x280 drivers/base/core.c:3996
 device_create+0xdf/0x120 drivers/base/core.c:4056
 bdi_register_va.part.0+0x9c/0x800 mm/backing-dev.c:871
 bdi_register_va mm/backing-dev.c:906 [inline]
 bdi_register+0x12a/0x140 mm/backing-dev.c:903
 __device_add_disk+0x923/0xd10 block/genhd.c:521
 add_disk include/linux/genhd.h:217 [inline]
 loop_add+0x6ec/0x8c0 drivers/block/loop.c:2395
 loop_control_ioctl+0x130/0x3c0 drivers/block/loop.c:2492
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:1069 [inline]
 __se_sys_ioctl fs/ioctl.c:1055 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:1055
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4739cd
Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 48 89 f8 48
89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d
01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6e331da198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000059c0a0 RCX: 00000000004739cd
RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000003
RBP: 00007f6e331da1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000030
R13: 00007ffe496b21bf R14: 00007ffe496b2360 R15: 00007f6e331da300
------------[ cut here ]------------
WARNING: CPU: 1 PID: 10131 at block/genhd.c:523
__device_add_disk+0xba9/0xd10 block/genhd.c:523
Modules linked in:
CPU: 1 PID: 10131 Comm: syz-executor Not tainted 5.14.0 #25
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014
RIP: 0010:__device_add_disk+0xba9/0xd10 block/genhd.c:523
Code: fd ff ff 4c 89 ef 89 44 24 28 e8 22 a5 f3 fd 8b 44 24 28 e9 6f
fd ff ff 4c 89 ef e8 a1 a4 f3 fd e9 d5 fd ff ff e8 f7 b6 ac fd <0f> 0b
e9 8c fd ff ff 48 8b 7c 24 08 e8 96 a4 f3 fd e9 0a f6 ff ff
RSP: 0018:ffffc90006527dc0 EFLAGS: 00010216
RAX: 0000000000027667 RBX: ffff888107d54ec0 RCX: 0000000000040000
RDX: ffffc90000889000 RSI: ffff888104715640 RDI: 0000000000000002
RBP: ffff888110beb400 R08: ffffffff83c84189 R09: 0000000000000000
R10: 0000000000000005 R11: fffffbfff17578ea R12: 0000000000000001
R13: ffff888107d5539c R14: ffff888110beb4a0 R15: 0000000000000000
FS:  00007f6e331da700(0000) GS:ffff888119f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005572256db150 CR3: 0000000104b9f006 CR4: 0000000000770ee0
PKRU: 55555554
Call Trace:
 add_disk include/linux/genhd.h:217 [inline]
 loop_add+0x6ec/0x8c0 drivers/block/loop.c:2395
 loop_control_ioctl+0x130/0x3c0 drivers/block/loop.c:2492
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:1069 [inline]
 __se_sys_ioctl fs/ioctl.c:1055 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:1055
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4739cd
Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 48 89 f8 48
89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d
01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6e331da198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000059c0a0 RCX: 00000000004739cd
RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000003
RBP: 00007f6e331da1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000030
R13: 00007ffe496b21bf R14: 00007ffe496b2360 R15: 00007f6e331da300