[syzbot] Monthly mm report (Nov 2024)

[syzbot] Monthly mm report (Nov 2024)

[syzbot]

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, 13 new issues were detected and 2 were fixed.
In total, 94 issues are still open and 266 have been fixed so far.

Some of the still happening issues:

Ref  Crashes Repro Title
<1>  10332   Yes   KASAN: slab-out-of-bounds Read in generic_perform_write
                   https://syzkaller.appspot.com/bug?extid=4a2376bc62e59406c414
<2>  7385    Yes   WARNING in ext4_dirty_folio
                   https://syzkaller.appspot.com/bug?extid=ecab51a4a5b9f26eeaa1
<3>  6624    Yes   possible deadlock in lock_mm_and_find_vma (2)
                   https://syzkaller.appspot.com/bug?extid=b02bbe0ff80a09a08c1b
<4>  3600    Yes   INFO: task hung in page_cache_ra_unbounded (2)
                   https://syzkaller.appspot.com/bug?extid=265e1cae90f8fa08f14d
<5>  2520    Yes   INFO: rcu detected stall in worker_thread (9)
                   https://syzkaller.appspot.com/bug?extid=225bfad78b079744fd5e
<6>  1786    Yes   possible deadlock in filemap_fault
                   https://syzkaller.appspot.com/bug?extid=7736960b837908f3a81d
<7>  852     Yes   possible deadlock in gup_fast_fallback
                   https://syzkaller.appspot.com/bug?extid=63ba90b81c16b86379bd
<8>  758     Yes   KCSAN: data-race in generic_fillattr / shmem_mknod (2)
                   https://syzkaller.appspot.com/bug?extid=702361cf7e3d95758761
<9>  721     No    WARNING: locking bug in __schedule
                   https://syzkaller.appspot.com/bug?extid=46b40e354b532433eeef
<10> 606     Yes   INFO: rcu detected stall in corrupted (4)
                   https://syzkaller.appspot.com/bug?extid=aa7d098bd6fa788fae8e

---
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Re: [syzbot] Monthly mm report (Nov 2024)

[Kirill A. Shutemov]

On Mon, Nov 04, 2024 at 03:35:33AM -0800, syzbot wrote:
> <3>  6624    Yes   possible deadlock in lock_mm_and_find_vma (2)
>                    https://syzkaller.appspot.com/bug?extid=b02bbe0ff80a09a08c1b

This one is fixed by 58a039e679fe ("mm: split critical region in
remap_file_pages() and invoke LSMs in between")

-- 
  Kiryl Shutsemau / Kirill A. Shutemov