[moderation] [ext4?] BUG: unable to handle kernel NULL pointer dereference in ext4_mb_add_groupinfo
0 views
Skip to first unread message
syzbot
Jun 9, 2024, 8:55:23 PMJun 9
to syzkaller-upst...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 71d7b52cc33b Merge tag 'for-linus' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13dbe432980000
kernel config: https://syzkaller.appspot.com/x/.config?x=96fd46a1ee1615e0
dashboard link: https://syzkaller.appspot.com/bug?extid=5628dd935014d960de7f
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386
CC: [adilger...@dilger.ca linux...@vger.kernel.org linux-...@vger.kernel.org ty...@mit.edu]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-71d7b52c.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2083371f9b54/vmlinux-71d7b52c.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9f8b0934f579/bzImage-71d7b52c.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5628dd...@syzkaller.appspotmail.com
loop2: detected capacity change from 0 to 512
EXT4-fs (loop2): revision level too high, forcing read-only mode
[EXT4 FS bs=1024, gc=1, bpg=8192, ipg=32, mo=8842c01c, mo2=0002]
BUG: kernel NULL pointer dereference, address: 0000000000000011
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 58544067 P4D 58544067 PUD 61d96067 PMD 0
Oops: Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 2 PID: 8653 Comm: syz-executor.2 Not tainted 6.10.0-rc2-syzkaller-00064-g71d7b52cc33b #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:___slab_alloc+0x27a/0x1870 mm/slub.c:3609
Code: 0b 49 83 7f 28 00 0f 85 de 07 00 00 4d 89 77 28 49 83 7c 24 10 00 0f 85 45 06 00 00 4d 8b 7c 24 18 4d 85 ff 0f 84 d2 06 00 00 <49> 8b 47 10 83 bd 68 ff ff ff ff 49 89 44 24 18 74 20 49 8b 07 48
RSP: 0018:ffffc90004fbf820 EFLAGS: 00010002
RAX: 0000000000000000 RBX: 0000000000000202 RCX: ffffffff816bc84e
RDX: 0000000000000001 RSI: ffffffff81e1a018 RDI: 0000000000000000
RBP: ffffc90004fbf900 R08: 0000000000000000 R09: fffffbfff283f058
R10: ffffffff941f82c7 R11: 0000000000000001 R12: ffffe8ffad26aba0
R13: ffff888019157680 R14: ffff88801bfd0000 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff88802c200000(0063) knlGS:00000000f5f30b40
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000000000011 CR3: 00000000632a8000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3756
__slab_alloc_node mm/slub.c:3809 [inline]
slab_alloc_node mm/slub.c:3988 [inline]
kmem_cache_alloc_noprof+0x2ae/0x2f0 mm/slub.c:4007
ext4_mb_add_groupinfo+0x445/0x1180 fs/ext4/mballoc.c:3355
ext4_mb_init_backend fs/ext4/mballoc.c:3434 [inline]
ext4_mb_init+0x127a/0x2530 fs/ext4/mballoc.c:3732
__ext4_fill_super fs/ext4/super.c:5501 [inline]
ext4_fill_super+0x6d55/0xacf0 fs/ext4/super.c:5676
get_tree_bdev+0x36f/0x610 fs/super.c:1615
vfs_get_tree+0x8f/0x380 fs/super.c:1780
do_new_mount fs/namespace.c:3352 [inline]
path_mount+0x6e1/0x1f10 fs/namespace.c:3679
do_mount fs/namespace.c:3692 [inline]
__do_sys_mount fs/namespace.c:3898 [inline]
__se_sys_mount fs/namespace.c:3875 [inline]
__ia32_sys_mount+0x295/0x320 fs/namespace.c:3875
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf733e579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f5f30400 EFLAGS: 00000292 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 00000000f5f30460 RCX: 0000000020000380
RDX: 0000000020000040 RSI: 0000000022000011 RDI: 00000000f5f304a0
RBP: 00000000f5f30460 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Modules linked in:
CR2: 0000000000000011
---[ end trace 0000000000000000 ]---
RIP: 0010:___slab_alloc+0x27a/0x1870 mm/slub.c:3609
Code: 0b 49 83 7f 28 00 0f 85 de 07 00 00 4d 89 77 28 49 83 7c 24 10 00 0f 85 45 06 00 00 4d 8b 7c 24 18 4d 85 ff 0f 84 d2 06 00 00 <49> 8b 47 10 83 bd 68 ff ff ff ff 49 89 44 24 18 74 20 49 8b 07 48
RSP: 0018:ffffc90004fbf820 EFLAGS: 00010002
RAX: 0000000000000000 RBX: 0000000000000202 RCX: ffffffff816bc84e
RDX: 0000000000000001 RSI: ffffffff81e1a018 RDI: 0000000000000000
RBP: ffffc90004fbf900 R08: 0000000000000000 R09: fffffbfff283f058
R10: ffffffff941f82c7 R11: 0000000000000001 R12: ffffe8ffad26aba0
R13: ffff888019157680 R14: ffff88801bfd0000 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff88802c200000(0063) knlGS:00000000f5f30b40
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000000000011 CR3: 00000000632a8000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 49 83 7f 28 00 cmpq $0x0,0x28(%r15)
5: 0f 85 de 07 00 00 jne 0x7e9
b: 4d 89 77 28 mov %r14,0x28(%r15)
f: 49 83 7c 24 10 00 cmpq $0x0,0x10(%r12)
15: 0f 85 45 06 00 00 jne 0x660
1b: 4d 8b 7c 24 18 mov 0x18(%r12),%r15
20: 4d 85 ff test %r15,%r15
23: 0f 84 d2 06 00 00 je 0x6fb
* 29: 49 8b 47 10 mov 0x10(%r15),%rax <-- trapping instruction
2d: 83 bd 68 ff ff ff ff cmpl $0xffffffff,-0x98(%rbp)
34: 49 89 44 24 18 mov %rax,0x18(%r12)
39: 74 20 je 0x5b
3b: 49 8b 07 mov (%r15),%rax
3e: 48 rex.W
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: 71d7b52cc33b Merge tag 'for-linus' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13dbe432980000
kernel config: https://syzkaller.appspot.com/x/.config?x=96fd46a1ee1615e0
dashboard link: https://syzkaller.appspot.com/bug?extid=5628dd935014d960de7f
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386
CC: [adilger...@dilger.ca linux...@vger.kernel.org linux-...@vger.kernel.org ty...@mit.edu]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-71d7b52c.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2083371f9b54/vmlinux-71d7b52c.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9f8b0934f579/bzImage-71d7b52c.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5628dd...@syzkaller.appspotmail.com
loop2: detected capacity change from 0 to 512
EXT4-fs (loop2): revision level too high, forcing read-only mode
[EXT4 FS bs=1024, gc=1, bpg=8192, ipg=32, mo=8842c01c, mo2=0002]
BUG: kernel NULL pointer dereference, address: 0000000000000011
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 58544067 P4D 58544067 PUD 61d96067 PMD 0
Oops: Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 2 PID: 8653 Comm: syz-executor.2 Not tainted 6.10.0-rc2-syzkaller-00064-g71d7b52cc33b #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:___slab_alloc+0x27a/0x1870 mm/slub.c:3609
Code: 0b 49 83 7f 28 00 0f 85 de 07 00 00 4d 89 77 28 49 83 7c 24 10 00 0f 85 45 06 00 00 4d 8b 7c 24 18 4d 85 ff 0f 84 d2 06 00 00 <49> 8b 47 10 83 bd 68 ff ff ff ff 49 89 44 24 18 74 20 49 8b 07 48
RSP: 0018:ffffc90004fbf820 EFLAGS: 00010002
RAX: 0000000000000000 RBX: 0000000000000202 RCX: ffffffff816bc84e
RDX: 0000000000000001 RSI: ffffffff81e1a018 RDI: 0000000000000000
RBP: ffffc90004fbf900 R08: 0000000000000000 R09: fffffbfff283f058
R10: ffffffff941f82c7 R11: 0000000000000001 R12: ffffe8ffad26aba0
R13: ffff888019157680 R14: ffff88801bfd0000 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff88802c200000(0063) knlGS:00000000f5f30b40
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000000000011 CR3: 00000000632a8000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3756
__slab_alloc_node mm/slub.c:3809 [inline]
slab_alloc_node mm/slub.c:3988 [inline]
kmem_cache_alloc_noprof+0x2ae/0x2f0 mm/slub.c:4007
ext4_mb_add_groupinfo+0x445/0x1180 fs/ext4/mballoc.c:3355
ext4_mb_init_backend fs/ext4/mballoc.c:3434 [inline]
ext4_mb_init+0x127a/0x2530 fs/ext4/mballoc.c:3732
__ext4_fill_super fs/ext4/super.c:5501 [inline]
ext4_fill_super+0x6d55/0xacf0 fs/ext4/super.c:5676
get_tree_bdev+0x36f/0x610 fs/super.c:1615
vfs_get_tree+0x8f/0x380 fs/super.c:1780
do_new_mount fs/namespace.c:3352 [inline]
path_mount+0x6e1/0x1f10 fs/namespace.c:3679
do_mount fs/namespace.c:3692 [inline]
__do_sys_mount fs/namespace.c:3898 [inline]
__se_sys_mount fs/namespace.c:3875 [inline]
__ia32_sys_mount+0x295/0x320 fs/namespace.c:3875
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf733e579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f5f30400 EFLAGS: 00000292 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 00000000f5f30460 RCX: 0000000020000380
RDX: 0000000020000040 RSI: 0000000022000011 RDI: 00000000f5f304a0
RBP: 00000000f5f30460 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Modules linked in:
CR2: 0000000000000011
---[ end trace 0000000000000000 ]---
RIP: 0010:___slab_alloc+0x27a/0x1870 mm/slub.c:3609
Code: 0b 49 83 7f 28 00 0f 85 de 07 00 00 4d 89 77 28 49 83 7c 24 10 00 0f 85 45 06 00 00 4d 8b 7c 24 18 4d 85 ff 0f 84 d2 06 00 00 <49> 8b 47 10 83 bd 68 ff ff ff ff 49 89 44 24 18 74 20 49 8b 07 48
RSP: 0018:ffffc90004fbf820 EFLAGS: 00010002
RAX: 0000000000000000 RBX: 0000000000000202 RCX: ffffffff816bc84e
RDX: 0000000000000001 RSI: ffffffff81e1a018 RDI: 0000000000000000
RBP: ffffc90004fbf900 R08: 0000000000000000 R09: fffffbfff283f058
R10: ffffffff941f82c7 R11: 0000000000000001 R12: ffffe8ffad26aba0
R13: ffff888019157680 R14: ffff88801bfd0000 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff88802c200000(0063) knlGS:00000000f5f30b40
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000000000011 CR3: 00000000632a8000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 49 83 7f 28 00 cmpq $0x0,0x28(%r15)
5: 0f 85 de 07 00 00 jne 0x7e9
b: 4d 89 77 28 mov %r14,0x28(%r15)
f: 49 83 7c 24 10 00 cmpq $0x0,0x10(%r12)
15: 0f 85 45 06 00 00 jne 0x660
1b: 4d 8b 7c 24 18 mov 0x18(%r12),%r15
20: 4d 85 ff test %r15,%r15
23: 0f 84 d2 06 00 00 je 0x6fb
* 29: 49 8b 47 10 mov 0x10(%r15),%rax <-- trapping instruction
2d: 83 bd 68 ff ff ff ff cmpl $0xffffffff,-0x98(%rbp)
34: 49 89 44 24 18 mov %rax,0x18(%r12)
39: 74 20 je 0x5b
3b: 49 8b 07 mov (%r15),%rax
3e: 48 rex.W
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
Reply all
Reply to author
Forward
0 new messages