[syzbot] Monthly ext4 report (Nov 2026)

[syzbot] Monthly ext4 report (Nov 2026)

[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, 2 new issues were detected and 1 were fixed.
In total, 29 issues are still open and 189 have already been fixed.
There are also 13 low-priority issues.

Some of the still happening issues:

Ref Crashes Repro Title
<1> 8189    Yes   KASAN: out-of-bounds Read in ext4_xattr_set_entry
                  https://syzkaller.appspot.com/bug?extid=f792df426ff0f5ceb8d1
<2> 6060    Yes   kernel BUG in ext4_do_writepages
                  https://syzkaller.appspot.com/bug?extid=d1da16f03614058fdc48
<3> 588     Yes   WARNING in ext4_mb_load_buddy_gfp
                  https://syzkaller.appspot.com/bug?extid=fd3f70a4509fca8c265d
<4> 358     Yes   WARNING in ext4_iomap_begin (3)
                  https://syzkaller.appspot.com/bug?extid=626aa13bf52efc3aa86e
<5> 3       Yes   KASAN: use-after-free Read in xattr_find_entry (2)
                  https://syzkaller.appspot.com/bug?extid=fb32afec111a7d61b939
<6> 1       Yes   KASAN: use-after-free Read in ext4_read_inline_data (2)
                  https://syzkaller.appspot.com/bug?extid=085a394c92518a04fd09
<7> 1       Yes   memory leak in __pcs_replace_full_main
                  https://syzkaller.appspot.com/bug?extid=4d078516add5f4f12cea
<8> 545     Yes   kernel BUG in ext4_mb_use_inode_pa (2)
                  https://syzkaller.appspot.com/bug?extid=d79019213609e7056a19
<9> 79      Yes   INFO: rcu detected stall in wb_workfn (4)
                  https://syzkaller.appspot.com/bug?extid=5b4f4f81240931b16844

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