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From: Thomas Gleixner <tglx@linutronix.de>
To: Sam Sun <samsun1006219@gmail.com>, linux-kernel@vger.kernel.org,
 akpm@linux-foundation.org
Cc: syzkaller-bugs@googlegroups.com, xrivendell7@gmail.com,
 reiserfs-devel@vger.kernel.org
Subject: Re: [Linux kernel bug] general protection fault in alloc_object
In-Reply-To: <CAEkJfYN_xh-zU-8ZgaSDdTgDejBv0uGHa_KW-Vi3CijZi5UZ+A@mail.gmail.com>
Date: Wed, 08 May 2024 16:20:53 +0200
Message-ID: <87pltwo056.ffs@tglx>
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On Tue, May 07 2024 at 14:32, Sam Sun wrote:
> ```
> general protection fault, probably for non-canonical address
> 0xdffffc0040000001: 0000 [#1] PREEMPT SMP KASAN NOPTI
> KASAN: probably user-memory-access in range
> [0x0000000200000008-0x000000020000000f]

This is a reiserfs issue. It crashes at random places:

[  348.634665][ T5992] REISERFS (device loop0): Using tea hash to sort names
[  348.780602][ T5993] (udev-worker)[5993]: segfault at 200000001 ip 0000000200000001 sp 00007fffca0e6190 error 14 in udevadm[5613a8f19000+1a000] likely on CPU 3 (core 0, socket 3)
[  348.796165][ T5993] Code: Unable to access opcode bytes at 0x1ffffffd7.
[  348.831600][ T5016] systemd-journald[5016]: /var/log/journal/a042c4e41bfd4c9697a628486ba7707d/system.journal: Journal file corrupted, rotating.
[  348.840565][ T6004] systemd-udevd[6004]: segfault at 100040048 ip 00007fde601b58a3 sp 00007fffca0e6250 error 4 in libc.so.6[7fde60108000+155000] likely on CPU 5 (core 0, socket 5)
[  348.844214][ T6004] Code: 89 10 49 8b b4 24 a8 10 00 00 eb 34 0f 1f 00 4c 8b 2d 69 f5 0f 00 64 45 8b 75 00 e8 27 42 fc ff e8 52 fe fa ff e9 01 fe ff ff <48> 8b 0a 48 8b 42 08 48 89 41 08 48 89 08 49 8b b4 24 a8 10 00 00
[  356.765557][ T5992] ==================================================================
[  356.767188][ T5992] BUG: unable to handle page fault for address: 0000000100040058
[  356.767204][ T5992] #PF: supervisor read access in kernel mode
[  356.767219][ T5992] #PF: error_code(0x0000) - not-present page
[  356.767233][ T5992] PGD 80000004ca01f067 P4D 80000004ca01f067 PUD 0 
[  356.767266][ T5992] Oops: 0000 [#1] PREEMPT SMP KASAN PTI
[  356.767294][ T5992] CPU: 4 PID: 5992 Comm: a Not tainted 6.9.0-rc7-00012-gdccb07f2914c-dirty #43
[  356.767325][ T5992] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[  356.767342][ T5992] RIP: 0010:stack_depot_save_flags+0x14b/0x8e0

Can we just get rid of this mess?

Thanks,

        tglx