linux-kernel - Re: [syzbot] [kvm?] WARNING in kvm_put

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Message-ID: <Z4lJeDIHfFT9_GG6@google.com>
Date: Thu, 16 Jan 2025 10:01:28 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: syzbot <syzbot+4f8d3ac3727ffc0ecd8a@...kaller.appspotmail.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, pbonzini@...hat.com, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [kvm?] WARNING in kvm_put_kvm (2)

On Wed, Oct 23, 2024, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    15e7d45e786a Add linux-next specific files for 20241016
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=1397b240580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=c36416f1c54640c0
> dashboard link: https://syzkaller.appspot.com/bug?extid=4f8d3ac3727ffc0ecd8a
> 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/cf2ad43c81cc/disk-15e7d45e.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/c85347a66a1c/vmlinux-15e7d45e.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/648cf8e59c13/bzImage-15e7d45e.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+4f8d3ac3727ffc0ecd8a@...kaller.appspotmail.com

Yet another bcachefs shutdown problem.

#syz set subsystems: bcachefs

[   88.514126][ T5826] bcachefs (loop1): flushing journal and stopping allocators complete, journal seq 4
[   88.569826][ T5836] EXT4-fs (loop2): unmounting filesystem 00000000-0000-0000-0000-000000000000.
[   88.618725][ T5826] bcachefs (loop1): clean shutdown complete, journal seq 5
[   88.807819][ T5826] bcachefs (loop1): marking filesystem clean
[   89.094513][ T5826] bcachefs (loop1): shutdown complete
[   89.339441][ T6085] loop3: detected capacity change from 0 to 32768
[   89.629580][ T6096] loop4: detected capacity change from 0 to 40427
[   89.700754][ T6096] F2FS-fs (loop4): build fault injection attr: rate: 771, type: 0x1fffff
[   90.062540][ T6085] XFS (loop3): Mounting V5 Filesystem c496e05e-540d-4c72-b591-04d79d8b4eeb
[   90.081642][ T6096] F2FS-fs (loop4): invalid crc value
[   90.127830][ T6098] tty tty20: ldisc open failed (-12), clearing slot 19
[   90.438369][ T6096] F2FS-fs (loop4): Found nat_bits in checkpoint
[   90.558422][ T6085] XFS (loop3): Ending clean mount
[   90.619095][ T6115] loop0: detected capacity change from 0 to 128
[   90.643095][ T6085] XFS (loop3): Unmounting Filesystem c496e05e-540d-4c72-b591-04d79d8b4eeb
[   90.671995][ T6096] F2FS-fs (loop4): Mounted with checkpoint version = 48b305e5
[   91.300054][ T6117] syz.0.30 (6117): drop_caches: 2
[   91.503301][ T6118] syz.4.29: attempt to access beyond end of device
[   91.503301][ T6118] loop4: rw=2049, sector=77824, nr_sectors = 144 limit=40427
[   91.556455][ T6096] F2FS-fs (loop4): inject lock_op in f2fs_trylock_op of f2fs_write_single_data_page+0xd20/0x1bd0
[   91.604651][ T6096] syz.4.29: attempt to access beyond end of device
[   91.604651][ T6096] loop4: rw=2049, sector=77968, nr_sectors = 112 limit=40427
[   91.632912][ T6091] ------------[ cut here ]------------
[   91.638499][ T6091] WARNING: CPU: 0 PID: 6091 at kernel/rcu/srcutree.c:681 cleanup_srcu_struct+0x404/0x4d0