2022-08-28 14:39:22

by Jiacheng Xu

[permalink] [raw]
Subject: WARNING in md_alloc

Hello,

When using modified Syzkaller to fuzz the Linux kernel-5.15.58, the
following crash was triggered.

HEAD commit: 568035b01cfb Linux-5.15.58
git tree: upstream

console output:
https://drive.google.com/file/d/1FU_URJHWwRs2KtNZ26WzxlSGE95DWBxe/view?usp=sharing
kernel config: https://drive.google.com/file/d/1wgIUDwP5ho29AM-K7HhysSTfWFpfXYkG/view?usp=sharing
syz repro: https://drive.google.com/file/d/1RYMFWOThdDCrjoFgRZrzfzXJP2AjHOLW/view?usp=sharing
C reproducer: https://drive.google.com/file/d/1ODU9zL9mWsfjlQJzz4WjS8IfDlvt_68F/view?usp=sharing

Environment:
Ubuntu 20.04 on Linux 5.4.0
QEMU 4.2.1:
qemu-system-x86_64 \
-m 2G \
-smp 2 \
-kernel /home/workdir/bzImage \
-append "console=ttyS0 root=/dev/sda earlyprintk=serial net.ifnames=0" \
-drive file=/home/workdir/stretch.img,format=raw \
-net user,host=10.0.2.10,hostfwd=tcp:127.0.0.1:10021-:22 \
-net nic,model=e1000 \
-enable-kvm \
-nographic \
-pidfile vm.pid \
2>&1 | tee vm.log

If you fix this issue, please add the following tag to the commit:
Reported-by: Jiacheng Xu<[email protected]>

==========================================================
loop7: detected capacity change from 0 to 96
NILFS (loop7): broken superblock, retrying with spare superblock
(blocksize = 1024)
NILFS (loop7): broken superblock, retrying with spare superblock
(blocksize = 2048)
NILFS (loop7): mounting unchecked fs
NILFS (loop7): recovery complete
sp0: Synchronizing with TNC
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 1
CPU: 2 PID: 7259 Comm: syz-executor Not tainted 5.15.58 #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x8b/0xb3 lib/dump_stack.c:106
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:1337
slab_pre_alloc_hook mm/slab.h:494 [inline]
slab_alloc_node mm/slub.c:3129 [inline]
slab_alloc mm/slub.c:3223 [inline]
kmem_cache_alloc+0x4e/0x820 mm/slub.c:3228
kmem_cache_zalloc include/linux/slab.h:711 [inline]
__kernfs_new_node+0xd4/0x8b0 fs/kernfs/dir.c:593
kernfs_new_node+0x93/0x120 fs/kernfs/dir.c:655
__kernfs_create_file+0x51/0x350 fs/kernfs/file.c:985
sysfs_add_file_mode_ns+0x226/0x540 fs/sysfs/file.c:317
sysfs_create_file_ns+0x131/0x1c0 fs/sysfs/file.c:343
sysfs_create_file include/linux/sysfs.h:607 [inline]
device_create_file+0xe6/0x1d0 drivers/base/core.c:2762
device_add+0x5b0/0x1d40 drivers/base/core.c:3338
device_add_disk+0x2fd/0xf90 block/genhd.c:446
add_disk include/linux/genhd.h:212 [inline]
md_alloc+0x947/0x11c0 drivers/md/md.c:5714
md_probe+0x69/0x70 drivers/md/md.c:5744
blk_request_module+0x111/0x1d0 block/genhd.c:681
blkdev_get_no_open+0x178/0x1e0 block/bdev.c:740
blkdev_get_by_dev block/bdev.c:804 [inline]
blkdev_get_by_dev+0x73/0x900 block/bdev.c:790
swsusp_check+0x97/0x2f0 kernel/power/swap.c:1526
software_resume kernel/power/hibernate.c:977 [inline]
software_resume+0x124/0x230 kernel/power/hibernate.c:912
resume_store+0xf1/0x130 kernel/power/hibernate.c:1179
kobj_attr_store+0x50/0x80 lib/kobject.c:856
sysfs_kf_write+0x110/0x160 fs/sysfs/file.c:139
kernfs_fop_write_iter+0x337/0x500 fs/kernfs/file.c:296
call_write_iter include/linux/fs.h:2087 [inline]
new_sync_write+0x432/0x660 fs/read_write.c:507
vfs_write+0x67a/0xae0 fs/read_write.c:594
ksys_write+0x12d/0x250 fs/read_write.c:647
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+0x61/0xcb
RIP: 0033:0x7f85eaf61dfd
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:00007f85e84c9c58 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f85eb0880a0 RCX: 00007f85eaf61dfd
RDX: 000000000000fdef RSI: 0000000020002500 RDI: 000000000000000d
RBP: 00007f85e84c9c90 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000001a
R13: 00007ffe899206df R14: 00007ffe89920880 R15: 00007f85e84c9dc0
</TASK>
------------[ cut here ]------------
WARNING: CPU: 2 PID: 7259 at block/genhd.c:544
device_add_disk+0x383/0xf90 block/genhd.c:544
Modules linked in:
CPU: 2 PID: 7259 Comm: syz-executor Not tainted 5.15.58 #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014
RIP: 0010:device_add_disk+0x383/0xf90 block/genhd.c:544
Code: 74 08 3c 03 0f 8e 02 0a 00 00 8b 5d 00 bf 03 01 00 00 89 de e8
1e 2b a6 fd 81 fb 03 01 00 00 0f 84 3b 02 00 00 e8 ad 29 a6 fd <0f> 0b
41 bc 01 00 00 00 e8 a0 29 a6 fd 44 89 e0 48 83 c4 38 5b 5d
RSP: 0018:ffffc9000826fa08 EFLAGS: 00010246
RAX: 0000000000040000 RBX: 0000000000000009 RCX: 0000000000040000
RDX: ffffc900018d1000 RSI: ffff888108590000 RDI: 0000000000000002
RBP: ffff888104e6e000 R08: ffffffff83d022a3 R09: 0000000000000103
R10: 0000000000000005 R11: ffffed1021112187 R12: 00000000fffffff4
R13: ffff888108890c00 R14: ffff888104e6e004 R15: ffff888104e6e080
FS: 00007f85e84ca700(0000) GS:ffff888063f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560a42f27150 CR3: 0000000016364000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
add_disk include/linux/genhd.h:212 [inline]
md_alloc+0x947/0x11c0 drivers/md/md.c:5714
md_probe+0x69/0x70 drivers/md/md.c:5744
blk_request_module+0x111/0x1d0 block/genhd.c:681
blkdev_get_no_open+0x178/0x1e0 block/bdev.c:740
blkdev_get_by_dev block/bdev.c:804 [inline]
blkdev_get_by_dev+0x73/0x900 block/bdev.c:790
swsusp_check+0x97/0x2f0 kernel/power/swap.c:1526
software_resume kernel/power/hibernate.c:977 [inline]
software_resume+0x124/0x230 kernel/power/hibernate.c:912
resume_store+0xf1/0x130 kernel/power/hibernate.c:1179
kobj_attr_store+0x50/0x80 lib/kobject.c:856
sysfs_kf_write+0x110/0x160 fs/sysfs/file.c:139
kernfs_fop_write_iter+0x337/0x500 fs/kernfs/file.c:296
call_write_iter include/linux/fs.h:2087 [inline]
new_sync_write+0x432/0x660 fs/read_write.c:507
vfs_write+0x67a/0xae0 fs/read_write.c:594
ksys_write+0x12d/0x250 fs/read_write.c:647
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+0x61/0xcb
RIP: 0033:0x7f85eaf61dfd
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:00007f85e84c9c58 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f85eb0880a0 RCX: 00007f85eaf61dfd
RDX: 000000000000fdef RSI: 0000000020002500 RDI: 000000000000000d
RBP: 00007f85e84c9c90 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000001a
R13: 00007ffe899206df R14: 00007ffe89920880 R15: 00007f85e84c9dc0
</TASK>


2022-08-29 01:35:20

by Guoqing Jiang

[permalink] [raw]
Subject: Re: WARNING in md_alloc

Hi,

On 8/28/22 10:34 PM, Jiacheng Xu wrote:
> Hello,
>
> When using modified Syzkaller to fuzz the Linux kernel-5.15.58, the
> following crash was triggered.
>
> HEAD commit: 568035b01cfb Linux-5.15.58

Pls try with a recently kernel such as 5.19 or 6.0-rc3.

Thanks,
Guoqing

2022-08-29 02:00:31

by Yu Kuai

[permalink] [raw]
Subject: Re: WARNING in md_alloc



在 2022/08/28 22:34, Jiacheng Xu 写道:
> Hello,
>
> When using modified Syzkaller to fuzz the Linux kernel-5.15.58, the
> following crash was triggered.
>
> HEAD commit: 568035b01cfb Linux-5.15.58
> git tree: upstream
>
> console output:
> https://drive.google.com/file/d/1FU_URJHWwRs2KtNZ26WzxlSGE95DWBxe/view?usp=sharing
> kernel config: https://drive.google.com/file/d/1wgIUDwP5ho29AM-K7HhysSTfWFpfXYkG/view?usp=sharing
> syz repro: https://drive.google.com/file/d/1RYMFWOThdDCrjoFgRZrzfzXJP2AjHOLW/view?usp=sharing
> C reproducer: https://drive.google.com/file/d/1ODU9zL9mWsfjlQJzz4WjS8IfDlvt_68F/view?usp=sharing
>
> Environment:
> Ubuntu 20.04 on Linux 5.4.0
> QEMU 4.2.1:
> qemu-system-x86_64 \
> -m 2G \
> -smp 2 \
> -kernel /home/workdir/bzImage \
> -append "console=ttyS0 root=/dev/sda earlyprintk=serial net.ifnames=0" \
> -drive file=/home/workdir/stretch.img,format=raw \
> -net user,host=10.0.2.10,hostfwd=tcp:127.0.0.1:10021-:22 \
> -net nic,model=e1000 \
> -enable-kvm \
> -nographic \
> -pidfile vm.pid \
> 2>&1 | tee vm.log
>
> If you fix this issue, please add the following tag to the commit:
> Reported-by: Jiacheng Xu<[email protected]>
>
> ==========================================================
> loop7: detected capacity change from 0 to 96
> NILFS (loop7): broken superblock, retrying with spare superblock
> (blocksize = 1024)
> NILFS (loop7): broken superblock, retrying with spare superblock
> (blocksize = 2048)
> NILFS (loop7): mounting unchecked fs
> NILFS (loop7): recovery complete
> sp0: Synchronizing with TNC
> FAULT_INJECTION: forcing a failure.
> name failslab, interval 1, probability 0, space 0, times 1
> CPU: 2 PID: 7259 Comm: syz-executor Not tainted 5.15.58 #2
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> 1.13.0-1ubuntu1.1 04/01/2014
> Call Trace:
> <TASK>
> __dump_stack lib/dump_stack.c:88 [inline]
> dump_stack_lvl+0x8b/0xb3 lib/dump_stack.c:106
> 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:1337
> slab_pre_alloc_hook mm/slab.h:494 [inline]
> slab_alloc_node mm/slub.c:3129 [inline]
> slab_alloc mm/slub.c:3223 [inline]
> kmem_cache_alloc+0x4e/0x820 mm/slub.c:3228
> kmem_cache_zalloc include/linux/slab.h:711 [inline]
> __kernfs_new_node+0xd4/0x8b0 fs/kernfs/dir.c:593
> kernfs_new_node+0x93/0x120 fs/kernfs/dir.c:655
> __kernfs_create_file+0x51/0x350 fs/kernfs/file.c:985
> sysfs_add_file_mode_ns+0x226/0x540 fs/sysfs/file.c:317
> sysfs_create_file_ns+0x131/0x1c0 fs/sysfs/file.c:343
> sysfs_create_file include/linux/sysfs.h:607 [inline]
> device_create_file+0xe6/0x1d0 drivers/base/core.c:2762
> device_add+0x5b0/0x1d40 drivers/base/core.c:3338
> device_add_disk+0x2fd/0xf90 block/genhd.c:446
> add_disk include/linux/genhd.h:212 [inline]
> md_alloc+0x947/0x11c0 drivers/md/md.c:5714
> md_probe+0x69/0x70 drivers/md/md.c:5744
> blk_request_module+0x111/0x1d0 block/genhd.c:681
> blkdev_get_no_open+0x178/0x1e0 block/bdev.c:740
> blkdev_get_by_dev block/bdev.c:804 [inline]
> blkdev_get_by_dev+0x73/0x900 block/bdev.c:790
> swsusp_check+0x97/0x2f0 kernel/power/swap.c:1526
> software_resume kernel/power/hibernate.c:977 [inline]
> software_resume+0x124/0x230 kernel/power/hibernate.c:912
> resume_store+0xf1/0x130 kernel/power/hibernate.c:1179
> kobj_attr_store+0x50/0x80 lib/kobject.c:856
> sysfs_kf_write+0x110/0x160 fs/sysfs/file.c:139
> kernfs_fop_write_iter+0x337/0x500 fs/kernfs/file.c:296
> call_write_iter include/linux/fs.h:2087 [inline]
> new_sync_write+0x432/0x660 fs/read_write.c:507
> vfs_write+0x67a/0xae0 fs/read_write.c:594
> ksys_write+0x12d/0x250 fs/read_write.c:647
> 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+0x61/0xcb
> RIP: 0033:0x7f85eaf61dfd
> 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:00007f85e84c9c58 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
> RAX: ffffffffffffffda RBX: 00007f85eb0880a0 RCX: 00007f85eaf61dfd
> RDX: 000000000000fdef RSI: 0000000020002500 RDI: 000000000000000d
> RBP: 00007f85e84c9c90 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000001a
> R13: 00007ffe899206df R14: 00007ffe89920880 R15: 00007f85e84c9dc0
> </TASK>
> ------------[ cut here ]------------
> WARNING: CPU: 2 PID: 7259 at block/genhd.c:544
> device_add_disk+0x383/0xf90 block/genhd.c:544
> Modules linked in:
> CPU: 2 PID: 7259 Comm: syz-executor Not tainted 5.15.58 #2
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> 1.13.0-1ubuntu1.1 04/01/2014
> RIP: 0010:device_add_disk+0x383/0xf90 block/genhd.c:544
> Code: 74 08 3c 03 0f 8e 02 0a 00 00 8b 5d 00 bf 03 01 00 00 89 de e8
> 1e 2b a6 fd 81 fb 03 01 00 00 0f 84 3b 02 00 00 e8 ad 29 a6 fd <0f> 0b
> 41 bc 01 00 00 00 e8 a0 29 a6 fd 44 89 e0 48 83 c4 38 5b 5d
> RSP: 0018:ffffc9000826fa08 EFLAGS: 00010246
> RAX: 0000000000040000 RBX: 0000000000000009 RCX: 0000000000040000
> RDX: ffffc900018d1000 RSI: ffff888108590000 RDI: 0000000000000002
> RBP: ffff888104e6e000 R08: ffffffff83d022a3 R09: 0000000000000103
> R10: 0000000000000005 R11: ffffed1021112187 R12: 00000000fffffff4
> R13: ffff888108890c00 R14: ffff888104e6e004 R15: ffff888104e6e080
> FS: 00007f85e84ca700(0000) GS:ffff888063f00000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000560a42f27150 CR3: 0000000016364000 CR4: 00000000003506e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> <TASK>
> add_disk include/linux/genhd.h:212 [inline]
> md_alloc+0x947/0x11c0 drivers/md/md.c:5714
> md_probe+0x69/0x70 drivers/md/md.c:5744
> blk_request_module+0x111/0x1d0 block/genhd.c:681
> blkdev_get_no_open+0x178/0x1e0 block/bdev.c:740
> blkdev_get_by_dev block/bdev.c:804 [inline]
> blkdev_get_by_dev+0x73/0x900 block/bdev.c:790
> swsusp_check+0x97/0x2f0 kernel/power/swap.c:1526
> software_resume kernel/power/hibernate.c:977 [inline]
> software_resume+0x124/0x230 kernel/power/hibernate.c:912
> resume_store+0xf1/0x130 kernel/power/hibernate.c:1179
> kobj_attr_store+0x50/0x80 lib/kobject.c:856
> sysfs_kf_write+0x110/0x160 fs/sysfs/file.c:139
> kernfs_fop_write_iter+0x337/0x500 fs/kernfs/file.c:296
> call_write_iter include/linux/fs.h:2087 [inline]
> new_sync_write+0x432/0x660 fs/read_write.c:507
> vfs_write+0x67a/0xae0 fs/read_write.c:594
> ksys_write+0x12d/0x250 fs/read_write.c:647
> 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+0x61/0xcb
> RIP: 0033:0x7f85eaf61dfd
> 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:00007f85e84c9c58 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
> RAX: ffffffffffffffda RBX: 00007f85eb0880a0 RCX: 00007f85eaf61dfd
> RDX: 000000000000fdef RSI: 0000000020002500 RDI: 000000000000000d
> RBP: 00007f85e84c9c90 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000001a
> R13: 00007ffe899206df R14: 00007ffe89920880 R15: 00007f85e84c9dc0
> </TASK>
> .
>

This is just a WARN_ON() that is triggered because memory alloc failure
is injected. And this is not a problem now that add_disk() has
appropriate error handling.

Thanks,
Kuai