[syzbot] Monthly mm report (May 2023)

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Hello mm maintainers/developers,

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

During the period, 7 new issues were detected and 2 were fixed.
In total, 47 issues are still open and 212 have been fixed so far.

Some of the still happening issues:

Ref Crashes Repro Title
<1> 177     Yes   INFO: task hung in do_read_cache_folio
                  https://syzkaller.appspot.com/bug?extid=be946efe33b2d9664348
<2> 97      Yes   INFO: task hung in __filemap_get_folio
                  https://syzkaller.appspot.com/bug?extid=0e9dc403e57033a74b1d
<3> 72      Yes   KASAN: null-ptr-deref Read in filemap_fault
                  https://syzkaller.appspot.com/bug?extid=48011b86c8ea329af1b9
<4> 57      Yes   WARNING in rcu_check_gp_start_stall
                  https://syzkaller.appspot.com/bug?extid=111bc509cd9740d7e4aa
<5> 15      No    possible deadlock in do_writepages
                  https://syzkaller.appspot.com/bug?extid=6898da502aef574c5f8a
<6> 5       No    kernel BUG in truncate_inode_partial_folio
                  https://syzkaller.appspot.com/bug?extid=77184b5e843d90d56ec1

---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx.

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