[syzbot] Monthly netfilter report (Sep 2026)

[syzbot]

Hello netfilter maintainers/developers,

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

During the period, 0 new issues were detected and 1 were fixed.
In total, 12 issues are still open and 199 have already been fixed.
There are also 2 low-priority issues.

Some of the still happening issues:

Ref Crashes Repro Title
<1> 119     Yes   INFO: rcu detected stall in rescuer_thread (2)
                  https://syzkaller.appspot.com/bug?extid=d5f7a5097c24c7c2dbbb
<2> 10      Yes   WARNING in nf_ct_bridge_post
                  https://syzkaller.appspot.com/bug?extid=a8ba738fe2db6b4bb27f
<3> 7       No    KASAN: invalid-free in rcu_free_sheaf
                  https://syzkaller.appspot.com/bug?extid=60332fd095f8bb2946ad
<4> 1977    Yes   INFO: task hung in addrconf_dad_work (5)
                  https://syzkaller.appspot.com/bug?extid=82ccd564344eeaa5427d
<5> 706     Yes   INFO: rcu detected stall in addrconf_rs_timer (6)
                  https://syzkaller.appspot.com/bug?extid=fecf8bd19c1f78edb255
<6> 176     Yes   INFO: rcu detected stall in br_handle_frame (6)
                  https://syzkaller.appspot.com/bug?extid=f8850bc3986562f79619
<7> 148     Yes   INFO: rcu detected stall in NF_HOOK (2)
                  https://syzkaller.appspot.com/bug?extid=34c2df040c6cfa15fdfe
<8> 82      Yes   INFO: task hung in nfnetlink_rcv_msg (5)
                  https://syzkaller.appspot.com/bug?extid=c4b20b80ee6a7a2f5012

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