Hello:
This patch was applied to jaegeuk/f2fs.git (dev)
by Jaegeuk Kim <[email protected]>:
On Mon, 20 Oct 2025 10:42:12 +0800 you wrote:
> As syzbot reported:
>
> F2FS-fs (loop0): __update_extent_tree_range: extent len is zero, type: 0,
> extent [0, 0, 0], age [0, 0]
> ------------[ cut here ]------------
> kernel BUG at fs/f2fs/extent_cache.c:678!
> Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
> CPU: 0 UID: 0 PID: 5336 Comm: syz.0.0 Not tainted syzkaller #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:__update_extent_tree_range+0x13bc/0x1500 fs/f2fs/extent_cache.c:678
> Call Trace:
> <TASK>
> f2fs_update_read_extent_cache_range+0x192/0x3e0 fs/f2fs/extent_cache.c:1085
> f2fs_do_zero_range fs/f2fs/file.c:1657 [inline]
> f2fs_zero_range+0x10c1/0x1580 fs/f2fs/file.c:1737
> f2fs_fallocate+0x583/0x990 fs/f2fs/file.c:2030
> vfs_fallocate+0x669/0x7e0 fs/open.c:342
> ioctl_preallocate fs/ioctl.c:289 [inline]
> file_ioctl+0x611/0x780 fs/ioctl.c:-1
> do_vfs_ioctl+0xb33/0x1430 fs/ioctl.c:576
> __do_sys_ioctl fs/ioctl.c:595 [inline]
> __se_sys_ioctl+0x82/0x170 fs/ioctl.c:583
> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
> do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f07bc58eec9
>
> [...]
Here is the summary with links:
- [f2fs-dev,v2] f2fs: fix to avoid updating zero-sized extent in extent cache
https://git.kernel.org/jaegeuk/f2fs/c/cbd96c6e304f
You are awesome, thank you!
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