netdev - Re: [syzbot] [net?] BUG: unable to handle kernel paging request in nsim_queue

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Message-ID: <xalg6eonr23hzgr5cbnmxfid2sv7crwgtehmytpkdiqzvpdsn6@tkjqfsirrlrv>
Date: Tue, 12 Aug 2025 08:33:58 -0700
From: Breno Leitao <leitao@...ian.org>
To: syzbot <syzbot+8aa80c6232008f7b957d@...kaller.appspotmail.com>
Cc: andrew+netdev@...n.ch, andrew@...n.ch, davem@...emloft.net, 
	edumazet@...gle.com, kuba@...nel.org, kuni1840@...il.com, kuniyu@...gle.com, 
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] BUG: unable to handle kernel paging request in
 nsim_queue_free

On Tue, Aug 12, 2025 at 02:58:28AM -0700, syzbot wrote:
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    53e760d89498 Merge tag 'nfsd-6.17-1' of git://git.kernel.o..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=16c415a2580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=d67d3af29f50297e
> dashboard link: https://syzkaller.appspot.com/bug?extid=8aa80c6232008f7b957d
> compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=151be9a2580000
> 
> Downloadable assets:
> disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-53e760d8.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/7f26eabe958a/vmlinux-53e760d8.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/60128fb74c23/bzImage-53e760d8.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+8aa80c6232008f7b957d@...kaller.appspotmail.com
> 
> BUG: unable to handle page fault for address: ffff88808d211020
> #PF: supervisor write access in kernel mode
> #PF: error_code(0x0002) - not-present page
> PGD 1a201067 P4D 1a201067 PUD 0 
> Oops: Oops: 0002 [#1] SMP KASAN NOPTI
> CPU: 0 UID: 0 PID: 6665 Comm: syz.1.416 Not tainted 6.17.0-rc1-syzkaller-00004-g53e760d89498 #0 PREEMPT(full) 
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
> RIP: 0010:local_add arch/x86/include/asm/local.h:33 [inline]
> RIP: 0010:u64_stats_add include/linux/u64_stats_sync.h:89 [inline]
> RIP: 0010:dev_dstats_rx_dropped_add include/linux/netdevice.h:3027 [inline]
> RIP: 0010:nsim_queue_free+0xdc/0x150 drivers/net/netdevsim/netdev.c:714

This is being fixed in this thread:

https://lore.kernel.org/all/20250731184829.1433735-1-kuniyu@google.com/