[moderation] [mtd?] BUG: unable to handle kernel NULL pointer dereference in destroy_ai
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syzbot
6:08 PM (2 hours ago) 6:08 PM
to syzkaller-upst...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 2d3090a8aeb5 Merge tag 'v7.1-p5' of git://git.kernel.org/p..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=152b5186580000
kernel config: https://syzkaller.appspot.com/x/.config?x=4e4d2284f2ffa41
dashboard link: https://syzkaller.appspot.com/bug?extid=08e9eb39f7bc678a0769
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
CC: [chengz...@huawei.com linux-...@vger.kernel.org linu...@lists.infradead.org miquel...@bootlin.com ric...@nod.at vign...@ti.com]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f9b5023ee498/disk-2d3090a8.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/27656d65ee6e/vmlinux-2d3090a8.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7a3c7def0a85/bzImage-2d3090a8.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+08e9eb...@syzkaller.appspotmail.com
ubi0 error: ubi_read_volume_table: the layout volume was not found
BUG: kernel NULL pointer dereference, address: 0000000000000008
#PF: supervisor read access in kernel mode
#PF: error_code(0x0001) - permissions violation
PGD 8000000059dbe067 P4D 8000000059dbe067 PUD 6aba4067 PMD 6282d067 PTE 800000007da12067
Oops: Oops: 0001 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 8974 Comm: syz.5.499 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:qlink_to_cache mm/kasan/quarantine.c:131 [inline]
RIP: 0010:qlist_move_cache+0x9d/0xf0 mm/kasan/quarantine.c:303
Code: 48 89 c2 48 c1 e2 06 48 03 15 5f 12 a7 0b 48 8b 42 08 48 89 c1 83 e1 01 48 83 e9 01 48 09 c8 48 21 d0 80 78 33 f5 49 0f 45 c4 <48> 8b 40 08 8b 50 18 48 39 c5 75 92 48 83 3b 00 74 33 48 8b 43 08
RSP: 0018:ffffc90003d97a38 EFLAGS: 00010006
RAX: 0000000000000000 RBX: ffffc90003d97a70 RCX: ffffffffffffffff
RDX: ffffea0001e07400 RSI: ffffc90003d97a70 RDI: ffff8880781d0001
RBP: ffff88807bb36140 R08: 0000000000000001 R09: fffff520007b2f3c
R10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff9b1b6d60 R14: ffff8880781d0001 R15: 0000000000000000
FS: 00007fb56d4876c0(0000) GS:ffff88812438e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 0000000043eec000 CR4: 00000000003526f0
Call Trace:
<TASK>
kasan_quarantine_remove_cache+0xf7/0x170 mm/kasan/quarantine.c:370
kmem_cache_destroy mm/slab_common.c:567 [inline]
kmem_cache_destroy+0x6b/0x190 mm/slab_common.c:527
destroy_ai+0x896/0xda0 drivers/mtd/ubi/attach.c:1360
ubi_attach+0xa00/0x4d30 drivers/mtd/ubi/attach.c:1648
ubi_attach_mtd_dev+0x139f/0x32a0 drivers/mtd/ubi/build.c:1004
ctrl_cdev_ioctl+0x36a/0x400 drivers/mtd/ubi/cdev.c:1113
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x840 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb56c59ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb56d487028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb56c816180 RCX: 00007fb56c59ce59
RDX: 0000000000000000 RSI: 0000000040186f40 RDI: 0000000000000005
RBP: 00007fb56c632d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb56c816218 R14: 00007fb56c816180 R15: 00007ffd9a2e6d98
</TASK>
Modules linked in:
CR2: 0000000000000008
---[ end trace 0000000000000000 ]---
RIP: 0010:qlink_to_cache mm/kasan/quarantine.c:131 [inline]
RIP: 0010:qlist_move_cache+0x9d/0xf0 mm/kasan/quarantine.c:303
Code: 48 89 c2 48 c1 e2 06 48 03 15 5f 12 a7 0b 48 8b 42 08 48 89 c1 83 e1 01 48 83 e9 01 48 09 c8 48 21 d0 80 78 33 f5 49 0f 45 c4 <48> 8b 40 08 8b 50 18 48 39 c5 75 92 48 83 3b 00 74 33 48 8b 43 08
RSP: 0018:ffffc90003d97a38 EFLAGS: 00010006
RAX: 0000000000000000 RBX: ffffc90003d97a70 RCX: ffffffffffffffff
RDX: ffffea0001e07400 RSI: ffffc90003d97a70 RDI: ffff8880781d0001
RBP: ffff88807bb36140 R08: 0000000000000001 R09: fffff520007b2f3c
R10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff9b1b6d60 R14: ffff8880781d0001 R15: 0000000000000000
FS: 00007fb56d4876c0(0000) GS:ffff88812438e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 0000000043eec000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
0: 48 89 c2 mov %rax,%rdx
3: 48 c1 e2 06 shl $0x6,%rdx
7: 48 03 15 5f 12 a7 0b add 0xba7125f(%rip),%rdx # 0xba7126d
e: 48 8b 42 08 mov 0x8(%rdx),%rax
12: 48 89 c1 mov %rax,%rcx
15: 83 e1 01 and $0x1,%ecx
18: 48 83 e9 01 sub $0x1,%rcx
1c: 48 09 c8 or %rcx,%rax
1f: 48 21 d0 and %rdx,%rax
22: 80 78 33 f5 cmpb $0xf5,0x33(%rax)
26: 49 0f 45 c4 cmovne %r12,%rax
* 2a: 48 8b 40 08 mov 0x8(%rax),%rax <-- trapping instruction
2e: 8b 50 18 mov 0x18(%rax),%edx
31: 48 39 c5 cmp %rax,%rbp
34: 75 92 jne 0xffffffc8
36: 48 83 3b 00 cmpq $0x0,(%rbx)
3a: 74 33 je 0x6f
3c: 48 8b 43 08 mov 0x8(%rbx),%rax
---
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: 2d3090a8aeb5 Merge tag 'v7.1-p5' of git://git.kernel.org/p..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=152b5186580000
kernel config: https://syzkaller.appspot.com/x/.config?x=4e4d2284f2ffa41
dashboard link: https://syzkaller.appspot.com/bug?extid=08e9eb39f7bc678a0769
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
CC: [chengz...@huawei.com linux-...@vger.kernel.org linu...@lists.infradead.org miquel...@bootlin.com ric...@nod.at vign...@ti.com]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f9b5023ee498/disk-2d3090a8.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/27656d65ee6e/vmlinux-2d3090a8.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7a3c7def0a85/bzImage-2d3090a8.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+08e9eb...@syzkaller.appspotmail.com
ubi0 error: ubi_read_volume_table: the layout volume was not found
BUG: kernel NULL pointer dereference, address: 0000000000000008
#PF: supervisor read access in kernel mode
#PF: error_code(0x0001) - permissions violation
PGD 8000000059dbe067 P4D 8000000059dbe067 PUD 6aba4067 PMD 6282d067 PTE 800000007da12067
Oops: Oops: 0001 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 8974 Comm: syz.5.499 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:qlink_to_cache mm/kasan/quarantine.c:131 [inline]
RIP: 0010:qlist_move_cache+0x9d/0xf0 mm/kasan/quarantine.c:303
Code: 48 89 c2 48 c1 e2 06 48 03 15 5f 12 a7 0b 48 8b 42 08 48 89 c1 83 e1 01 48 83 e9 01 48 09 c8 48 21 d0 80 78 33 f5 49 0f 45 c4 <48> 8b 40 08 8b 50 18 48 39 c5 75 92 48 83 3b 00 74 33 48 8b 43 08
RSP: 0018:ffffc90003d97a38 EFLAGS: 00010006
RAX: 0000000000000000 RBX: ffffc90003d97a70 RCX: ffffffffffffffff
RDX: ffffea0001e07400 RSI: ffffc90003d97a70 RDI: ffff8880781d0001
RBP: ffff88807bb36140 R08: 0000000000000001 R09: fffff520007b2f3c
R10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff9b1b6d60 R14: ffff8880781d0001 R15: 0000000000000000
FS: 00007fb56d4876c0(0000) GS:ffff88812438e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 0000000043eec000 CR4: 00000000003526f0
Call Trace:
<TASK>
kasan_quarantine_remove_cache+0xf7/0x170 mm/kasan/quarantine.c:370
kmem_cache_destroy mm/slab_common.c:567 [inline]
kmem_cache_destroy+0x6b/0x190 mm/slab_common.c:527
destroy_ai+0x896/0xda0 drivers/mtd/ubi/attach.c:1360
ubi_attach+0xa00/0x4d30 drivers/mtd/ubi/attach.c:1648
ubi_attach_mtd_dev+0x139f/0x32a0 drivers/mtd/ubi/build.c:1004
ctrl_cdev_ioctl+0x36a/0x400 drivers/mtd/ubi/cdev.c:1113
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x840 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb56c59ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb56d487028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb56c816180 RCX: 00007fb56c59ce59
RDX: 0000000000000000 RSI: 0000000040186f40 RDI: 0000000000000005
RBP: 00007fb56c632d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb56c816218 R14: 00007fb56c816180 R15: 00007ffd9a2e6d98
</TASK>
Modules linked in:
CR2: 0000000000000008
---[ end trace 0000000000000000 ]---
RIP: 0010:qlink_to_cache mm/kasan/quarantine.c:131 [inline]
RIP: 0010:qlist_move_cache+0x9d/0xf0 mm/kasan/quarantine.c:303
Code: 48 89 c2 48 c1 e2 06 48 03 15 5f 12 a7 0b 48 8b 42 08 48 89 c1 83 e1 01 48 83 e9 01 48 09 c8 48 21 d0 80 78 33 f5 49 0f 45 c4 <48> 8b 40 08 8b 50 18 48 39 c5 75 92 48 83 3b 00 74 33 48 8b 43 08
RSP: 0018:ffffc90003d97a38 EFLAGS: 00010006
RAX: 0000000000000000 RBX: ffffc90003d97a70 RCX: ffffffffffffffff
RDX: ffffea0001e07400 RSI: ffffc90003d97a70 RDI: ffff8880781d0001
RBP: ffff88807bb36140 R08: 0000000000000001 R09: fffff520007b2f3c
R10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff9b1b6d60 R14: ffff8880781d0001 R15: 0000000000000000
FS: 00007fb56d4876c0(0000) GS:ffff88812438e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 0000000043eec000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
0: 48 89 c2 mov %rax,%rdx
3: 48 c1 e2 06 shl $0x6,%rdx
7: 48 03 15 5f 12 a7 0b add 0xba7125f(%rip),%rdx # 0xba7126d
e: 48 8b 42 08 mov 0x8(%rdx),%rax
12: 48 89 c1 mov %rax,%rcx
15: 83 e1 01 and $0x1,%ecx
18: 48 83 e9 01 sub $0x1,%rcx
1c: 48 09 c8 or %rcx,%rax
1f: 48 21 d0 and %rdx,%rax
22: 80 78 33 f5 cmpb $0xf5,0x33(%rax)
26: 49 0f 45 c4 cmovne %r12,%rax
* 2a: 48 8b 40 08 mov 0x8(%rax),%rax <-- trapping instruction
2e: 8b 50 18 mov 0x18(%rax),%edx
31: 48 39 c5 cmp %rax,%rbp
34: 75 92 jne 0xffffffc8
36: 48 83 3b 00 cmpq $0x0,(%rbx)
3a: 74 33 je 0x6f
3c: 48 8b 43 08 mov 0x8(%rbx),%rax
---
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
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