linux-kernel - [syzbot] [kernel?] BUG: unable to handle kernel NULL pointer dereference in __put

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Message-ID: <6745e1a2.050a0220.1286eb.001d.GAE@google.com>
Date: Tue, 26 Nov 2024 06:56:34 -0800
From: syzbot <syzbot+b271f27b05eb3340c195@...kaller.appspotmail.com>
To: bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com, 
	linux-kernel@...r.kernel.org, mingo@...hat.com, 
	syzkaller-bugs@...glegroups.com, tglx@...utronix.de, x86@...nel.org
Subject: [syzbot] [kernel?] BUG: unable to handle kernel NULL pointer
 dereference in __put_partials (2)

Hello,

syzbot found the following issue on:

HEAD commit:    9f16d5e6f220 Merge tag 'for-linus' of git://git.kernel.org..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=129cf75f980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=54f7b2f59e7640e5
dashboard link: https://syzkaller.appspot.com/bug?extid=b271f27b05eb3340c195
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/7562d921dc97/disk-9f16d5e6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8fb84b5dec53/vmlinux-9f16d5e6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/cac8b3f180c1/bzImage-9f16d5e6.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b271f27b05eb3340c195@...kaller.appspotmail.com

BUG: kernel NULL pointer dereference, address: 0000000000000002
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 800000002fc40067 P4D 800000002fc40067 PUD 0 
Oops: Oops: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 1 UID: 0 PID: 25 Comm: kworker/1:0 Not tainted 6.12.0-syzkaller-09073-g9f16d5e6f220 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: slub_flushwq flush_cpu_slab
RIP: 0010:PagePoisoned include/linux/page-flags.h:293 [inline]
RIP: 0010:page_to_nid include/linux/mm.h:1647 [inline]
RIP: 0010:folio_nid include/linux/mm.h:1653 [inline]
RIP: 0010:slab_nid mm/slab.h:196 [inline]
RIP: 0010:__put_partials+0x26/0x130 mm/slub.c:3119
Code: 90 90 90 90 55 41 57 41 56 41 55 41 54 53 50 48 85 f6 0f 84 df 00 00 00 48 89 f3 49 89 fe 31 c0 48 89 04 24 45 31 ff 45 31 ed <48> 8b 03 48 83 f8 ff 0f 84 d3 00 00 00 4c 8b 63 10 48 c1 e8 3a 49
RSP: 0018:ffffc900001f7b18 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000002 RCX: ffffffff81718e6a
RDX: dffffc0000000000 RSI: 0000000000000002 RDI: ffff88803003f8c0
RBP: 0000000000000001 R08: ffffffff942ea8b7 R09: 1ffffffff285d516
R10: dffffc0000000000 R11: fffffbfff285d517 R12: 0000000000000002
R13: 0000000000000000 R14: ffff88803003f8c0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000002 CR3: 00000000667dc000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 put_partials mm/slub.c:3164 [inline]
 flush_cpu_slab+0x2bf/0x450 mm/slub.c:3299
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/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: 0000000000000002
---[ end trace 0000000000000000 ]---
RIP: 0010:PagePoisoned include/linux/page-flags.h:293 [inline]
RIP: 0010:page_to_nid include/linux/mm.h:1647 [inline]
RIP: 0010:folio_nid include/linux/mm.h:1653 [inline]
RIP: 0010:slab_nid mm/slab.h:196 [inline]
RIP: 0010:__put_partials+0x26/0x130 mm/slub.c:3119
Code: 90 90 90 90 55 41 57 41 56 41 55 41 54 53 50 48 85 f6 0f 84 df 00 00 00 48 89 f3 49 89 fe 31 c0 48 89 04 24 45 31 ff 45 31 ed <48> 8b 03 48 83 f8 ff 0f 84 d3 00 00 00 4c 8b 63 10 48 c1 e8 3a 49
RSP: 0018:ffffc900001f7b18 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000002 RCX: ffffffff81718e6a
RDX: dffffc0000000000 RSI: 0000000000000002 RDI: ffff88803003f8c0
RBP: 0000000000000001 R08: ffffffff942ea8b7 R09: 1ffffffff285d516
R10: dffffc0000000000 R11: fffffbfff285d517 R12: 0000000000000002
R13: 0000000000000000 R14: ffff88803003f8c0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000002 CR3: 00000000667dc000 CR4: 00000000003526f0
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:	55                   	push   %rbp
   5:	41 57                	push   %r15
   7:	41 56                	push   %r14
   9:	41 55                	push   %r13
   b:	41 54                	push   %r12
   d:	53                   	push   %rbx
   e:	50                   	push   %rax
   f:	48 85 f6             	test   %rsi,%rsi
  12:	0f 84 df 00 00 00    	je     0xf7
  18:	48 89 f3             	mov    %rsi,%rbx
  1b:	49 89 fe             	mov    %rdi,%r14
  1e:	31 c0                	xor    %eax,%eax
  20:	48 89 04 24          	mov    %rax,(%rsp)
  24:	45 31 ff             	xor    %r15d,%r15d
  27:	45 31 ed             	xor    %r13d,%r13d
* 2a:	48 8b 03             	mov    (%rbx),%rax <-- trapping instruction
  2d:	48 83 f8 ff          	cmp    $0xffffffffffffffff,%rax
  31:	0f 84 d3 00 00 00    	je     0x10a
  37:	4c 8b 63 10          	mov    0x10(%rbx),%r12
  3b:	48 c1 e8 3a          	shr    $0x3a,%rax
  3f:	49                   	rex.WB


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