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Date: Mon, 27 May 2024 01:04:26 -0700
Message-ID: <0000000000004dbd4f06196af76f@google.com>
Subject: [syzbot] [kernel?] BUG: unable to handle kernel NULL pointer
 dereference in deactivate_slab
From: syzbot <syzbot+79388700e25aa19555b9@syzkaller.appspotmail.com>
To: bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, 
	linux-kernel@vger.kernel.org, mingo@redhat.com, 
	syzkaller-bugs@googlegroups.com, tglx@linutronix.de, x86@kernel.org
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Hello,

syzbot found the following issue on:

HEAD commit:    1613e604df0c Linux 6.10-rc1
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15410752980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=733cc7a95171d8e7
dashboard link: https://syzkaller.appspot.com/bug?extid=79388700e25aa19555b9
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386

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-1613e604.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/bdfe02141e4c/vmlinux-1613e604.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9e655c2629f1/bzImage-1613e604.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+79388700e25aa19555b9@syzkaller.appspotmail.com

BUG: kernel NULL pointer dereference, address: 0000000000000001
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 256e3067 P4D 256e3067 PUD 4977c067 PMD 0 
Oops: Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 3 PID: 56 Comm: kworker/3:1 Not tainted 6.10.0-rc1-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:296 [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/0x4a0 mm/slub.c:2880
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 41 57 41 56 49 89 f6 41 55 41 54 53 48 83 e4 f0 48 81 ec b0 00 00 00 <48> 8b 06 48 89 54 24 08 48 83 f8 ff 0f 84 c3 03 00 00 48 8b 06 48
RSP: 0018:ffffc9000076fbb0 EFLAGS: 00010282
RAX: 0000000000000002 RBX: ffffe8ffad339190 RCX: 1ffffffff28415f8
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888021133540
RBP: ffffc9000076fc88 R08: 0000000000000001 R09: fffffbfff283ee5e
R10: ffffffff941f72f7 R11: ffffffff81e16fea R12: 0000000000000200
R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000003
FS:  0000000000000000(0000) GS:ffff88802c300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000001 CR3: 000000001b47c000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 flush_slab mm/slub.c:3100 [inline]
 flush_cpu_slab+0x141/0x410 mm/slub.c:3146
 process_one_work+0x958/0x1ad0 kernel/workqueue.c:3231
 process_scheduled_works kernel/workqueue.c:3312 [inline]
 worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 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: 0000000000000001
---[ end trace 0000000000000000 ]---
RIP: 0010:PagePoisoned include/linux/page-flags.h:296 [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/0x4a0 mm/slub.c:2880
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 41 57 41 56 49 89 f6 41 55 41 54 53 48 83 e4 f0 48 81 ec b0 00 00 00 <48> 8b 06 48 89 54 24 08 48 83 f8 ff 0f 84 c3 03 00 00 48 8b 06 48
RSP: 0018:ffffc9000076fbb0 EFLAGS: 00010282
RAX: 0000000000000002 RBX: ffffe8ffad339190 RCX: 1ffffffff28415f8
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888021133540
RBP: ffffc9000076fc88 R08: 0000000000000001 R09: fffffbfff283ee5e
R10: ffffffff941f72f7 R11: ffffffff81e16fea R12: 0000000000000200
R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000003
FS:  0000000000000000(0000) GS:ffff88802c300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000001 CR3: 000000001b47c000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
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:	49 89 f6             	mov    %rsi,%r14
  1a:	41 55                	push   %r13
  1c:	41 54                	push   %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 08       	mov    %rdx,0x8(%rsp)
  32:	48 83 f8 ff          	cmp    $0xffffffffffffffff,%rax
  36:	0f 84 c3 03 00 00    	je     0x3ff
  3c:	48 8b 06             	mov    (%rsi),%rax
  3f:	48                   	rex.W


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