[syzbot] Monthly ext4 report (Nov 2025)

[syzbot]

Hello ext4 maintainers/developers,

This is a 31-day syzbot report for the ext4 subsystem.
All related reports/information can be found at:
https://syzkaller.appspot.com/upstream/s/ext4

During the period, 6 new issues were detected and 0 were fixed.
In total, 51 issues are still open and 163 have already been fixed.

Some of the still happening issues:

Ref  Crashes Repro Title
<1>  4656    Yes   KASAN: out-of-bounds Read in ext4_xattr_set_entry
                   https://syzkaller.appspot.com/bug?extid=f792df426ff0f5ceb8d1
<2>  2848    Yes   kernel BUG in ext4_do_writepages
                   https://syzkaller.appspot.com/bug?extid=d1da16f03614058fdc48
<3>  2818    Yes   INFO: task hung in sync_inodes_sb (5)
                   https://syzkaller.appspot.com/bug?extid=30476ec1b6dc84471133
<4>  2141    Yes   INFO: task hung in jbd2_journal_commit_transaction (5)
                   https://syzkaller.appspot.com/bug?extid=3071bdd0a9953bc0d177
<5>  1317    Yes   possible deadlock in ext4_writepages (2)
                   https://syzkaller.appspot.com/bug?extid=eb5b4ef634a018917f3c
<6>  1083    Yes   WARNING in ext4_xattr_inode_update_ref (2)
                   https://syzkaller.appspot.com/bug?extid=76916a45d2294b551fd9
<7>  989     Yes   WARNING in ext4_xattr_inode_lookup_create
                   https://syzkaller.appspot.com/bug?extid=fe42a669c87e4a980051
<8>  635     No    KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode (3)
                   https://syzkaller.appspot.com/bug?extid=35257a2200785ea628f5
<9>  448     Yes   INFO: task hung in do_get_write_access (3)
                   https://syzkaller.appspot.com/bug?extid=e7c786ece54bad9d1e43
<10> 277     Yes   INFO: task hung in do_renameat2 (2)
                   https://syzkaller.appspot.com/bug?extid=39a12f7473ed8066d2ca

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