[syzbot] Monthly ext4 report (Oct 2026)

[syzbot] Monthly ext4 report (Oct 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, 36 issues are still open and 186 have already been fixed.
There are also 9 low-priority issues.

Some of the still happening issues:

Ref Crashes Repro Title
<1> 8084    Yes   KASAN: out-of-bounds Read in ext4_xattr_set_entry
                  https://syzkaller.appspot.com/bug?extid=f792df426ff0f5ceb8d1
<2> 5595    Yes   kernel BUG in ext4_do_writepages
                  https://syzkaller.appspot.com/bug?extid=d1da16f03614058fdc48
<3> 345     Yes   WARNING in ext4_iomap_begin (3)
                  https://syzkaller.appspot.com/bug?extid=626aa13bf52efc3aa86e
<4> 297     Yes   WARNING in ext4_mb_load_buddy_gfp
                  https://syzkaller.appspot.com/bug?extid=fd3f70a4509fca8c265d
<5> 16      Yes   INFO: task hung in ext4_write_end
                  https://syzkaller.appspot.com/bug?extid=16bf7cd0ebeb1de93aa5
<6> 1       Yes   KASAN: use-after-free Read in ext4_read_inline_data (2)
                  https://syzkaller.appspot.com/bug?extid=085a394c92518a04fd09
<7> 513     Yes   kernel BUG in ext4_mb_use_inode_pa (2)
                  https://syzkaller.appspot.com/bug?extid=d79019213609e7056a19
<8> 175     Yes   WARNING in ext4_journal_check_start (2)
                  https://syzkaller.appspot.com/bug?extid=b75d75f957975f3d40e3
<9> 78      Yes   INFO: rcu detected stall in wb_workfn (4)
                  https://syzkaller.appspot.com/bug?extid=5b4f4f81240931b16844

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