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Message-ID: <20240527085801.GAZlRLGZpDIdCq4p2z@fat_crate.local>
Date: Mon, 27 May 2024 10:59:03 +0200
From: Borislav Petkov <bp@...en8.de>
To: syzbot <syzbot+79388700e25aa19555b9@...kaller.appspotmail.com>,
linux-mm <linux-mm@...ck.org>
Cc: 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: Re: [syzbot] [kernel?] BUG: unable to handle kernel NULL pointer
dereference in deactivate_slab
+ linux-mm
syzbot folks: might wanna refresh your patterns on how this automated
thing is deciding who to Cc. This is clearly a mm issue.
On Mon, May 27, 2024 at 01:04:26AM -0700, syzbot wrote:
> 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@...kaller.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
>
>
> ---
> 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 syzkaller@...glegroups.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
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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