Dear Linux kernel developers and maintainers: We are writing to report a kernel WARNING in ext4_mb_use_preallocated, discovered with our modified version of syzkaller. This issue was initially found in kernel v6.17-rc5 (commit 76eeb9b8de9880ca38696b2fb56ac45ac0a25c6c). Unfortunately, we do not have a stable C or Syz program to reproduce this warning. We are actively analyzing the root cause and working to create a reliable reproducer, which we will share as soon as it is available. Attached are the kernel console output, .config file, and formatted bug reports (formatted by syz-symbolize) for your analysis. Please let us know if any further information would be helpful. Best regards, Jiaming Zhang
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