[moderation] [kernel?] BUG: unable to handle kernel NULL pointer dereference in deactivate_slab

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: a38297e3fb01 Linux 6.9
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10326884980000
kernel config: https://syzkaller.appspot.com/x/.config?x=edefe34e4544d70e
dashboard link: https://syzkaller.appspot.com/bug?extid=8628c07c74800c984046
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386
CC: [b...@alien8.de dave....@linux.intel.com h...@zytor.com linux-...@vger.kernel.org mi...@redhat.com tg...@linutronix.de x...@kernel.org]

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-a38297e3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/eb6ef4d9e74f/vmlinux-a38297e3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ce2fb6bcfd40/bzImage-a38297e3.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8628c0...@syzkaller.appspotmail.com

BUG: kernel NULL pointer dereference, address: 0000000000000028
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 49258067 P4D 49258067 PUD 6e38e067 PMD 0
Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 PID: 14099 Comm: kworker/0:8 Not tainted 6.9.0-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: slub_flushwq flush_cpu_slab
RIP: 0010:PagePoisoned include/linux/page-flags.h:297 [inline]
RIP: 0010:page_to_nid include/linux/mm.h:1664 [inline]
RIP: 0010:folio_nid include/linux/mm.h:1670 [inline]
RIP: 0010:slab_nid mm/slab.h:194 [inline]
RIP: 0010:deactivate_slab+0x1b/0x3d0 mm/slub.c:2797
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 41 57 41 56 41 55 41 54 49 89 f4 53 48 83 e4 f0 48 81 ec b0 00 00 00 <48> 8b 06 48 89 54 24 28 48 83 f8 ff 0f 84 13 03 00 00 48 8b 06 48
RSP: 0018:ffffc9002308fbb0 EFLAGS: 00010282
RAX: 0000000000000006 RBX: ffffe8ffacc1a4a0 RCX: 1ffffffff27afde9
RDX: 0000000000000000 RSI: 0000000000000028 RDI: ffff888024d97b80
RBP: ffffc9002308fc90 R08: 0000000000000001 R09: fffffbfff27ad636
R10: ffffffff93d6b1b7 R11: ffffffff81e0bf8a R12: 0000000000000028
R13: 0000000000000028 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88802c200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000028 CR3: 000000005c8ea000 CR4: 0000000000350ef0
Call Trace:
<TASK>
flush_slab mm/slub.c:3017 [inline]
flush_cpu_slab+0x141/0x410 mm/slub.c:3063
process_one_work+0x902/0x1a30 kernel/workqueue.c:3267
process_scheduled_works kernel/workqueue.c:3348 [inline]
worker_thread+0x6c8/0xf70 kernel/workqueue.c:3429
kthread+0x2c1/0x3a0 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
Modules linked in:
CR2: 0000000000000028
---[ end trace 0000000000000000 ]---
RIP: 0010:PagePoisoned include/linux/page-flags.h:297 [inline]
RIP: 0010:page_to_nid include/linux/mm.h:1664 [inline]
RIP: 0010:folio_nid include/linux/mm.h:1670 [inline]
RIP: 0010:slab_nid mm/slab.h:194 [inline]
RIP: 0010:deactivate_slab+0x1b/0x3d0 mm/slub.c:2797
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 41 57 41 56 41 55 41 54 49 89 f4 53 48 83 e4 f0 48 81 ec b0 00 00 00 <48> 8b 06 48 89 54 24 28 48 83 f8 ff 0f 84 13 03 00 00 48 8b 06 48
RSP: 0018:ffffc9002308fbb0 EFLAGS: 00010282
RAX: 0000000000000006 RBX: ffffe8ffacc1a4a0 RCX: 1ffffffff27afde9
RDX: 0000000000000000 RSI: 0000000000000028 RDI: ffff888024d97b80
RBP: ffffc9002308fc90 R08: 0000000000000001 R09: fffffbfff27ad636
R10: ffffffff93d6b1b7 R11: ffffffff81e0bf8a R12: 0000000000000028
R13: 0000000000000028 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88802c200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000028 CR3: 000000005c8ea000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
0: 90 nop
1: 90 nop
2: 90 nop
3: 90 nop
4: 90 nop
5: 90 nop
6: 90 nop
7: 90 nop
8: 90 nop
9: 90 nop
a: 90 nop
b: 90 nop
c: 90 nop
d: 90 nop
e: 90 nop
f: 55 push %rbp
10: 48 89 e5 mov %rsp,%rbp
13: 41 57 push %r15
15: 41 56 push %r14
17: 41 55 push %r13
19: 41 54 push %r12
1b: 49 89 f4 mov %rsi,%r12
1e: 53 push %rbx
1f: 48 83 e4 f0 and $0xfffffffffffffff0,%rsp
23: 48 81 ec b0 00 00 00 sub $0xb0,%rsp
* 2a: 48 8b 06 mov (%rsi),%rax <-- trapping instruction
2d: 48 89 54 24 28 mov %rdx,0x28(%rsp)
32: 48 83 f8 ff cmp $0xffffffffffffffff,%rax
36: 0f 84 13 03 00 00 je 0x34f
3c: 48 8b 06 mov (%rsi),%rax
3f: 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]

Sending this report to the next reporting stage.