[syzbot] Monthly bpf report (Jan 2024)

[syzbot]

Hello bpf maintainers/developers,

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

During the period, 2 new issues were detected and 0 were fixed.
In total, 15 issues are still open and 200 have been fixed so far.

Some of the still happening issues:

Ref Crashes Repro Title
<1> 8166    Yes   possible deadlock in task_fork_fair
                  https://syzkaller.appspot.com/bug?extid=1a93ee5d329e97cfbaff
<2> 21      Yes   BUG: unable to handle kernel NULL pointer dereference in sk_msg_recvmsg
                  https://syzkaller.appspot.com/bug?extid=84f695756ed0c4bb3aba
<3> 19      Yes   WARNING in __mark_chain_precision (3)
                  https://syzkaller.appspot.com/bug?extid=4d6330e14407721955eb
<4> 3       Yes   INFO: rcu detected stall in sys_newfstatat (4)
                  https://syzkaller.appspot.com/bug?extid=1c02a56102605204445c
<5> 2       Yes   UBSAN: shift-out-of-bounds in adjust_reg_min_max_vals
                  https://syzkaller.appspot.com/bug?extid=46700eea57ecc7f84776
<6> 1       Yes   INFO: rcu detected stall in sys_unshare (9)
                  https://syzkaller.appspot.com/bug?extid=872bccd9a68c6ba47718

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