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cc=ntf awl=host:13801 X-Proofpoint-GUID: aRLM7ZhNdjn5_QCVqUHjvmHE7nZx94nw X-Proofpoint-ORIG-GUID: aRLM7ZhNdjn5_QCVqUHjvmHE7nZx94nw Hi, +Allison On 2026-02-17 09:28, Gerd Rausch wrote: > On 2026-02-17 09:19, Fernando Fernandez Mancera wrote: >> On 2/17/26 6:13 PM, Gerd Rausch wrote: >>> If someone were to change the code to pass in "fan_out == true" >>> from a context not already holding a socket lock, >>> would they remember to change rds_tcp_conn_slots_available() >>> to acquire that lock? >>> >> >> Usually kernel requires the developer to understand when do they need to acquire a lock or not. >> Anyway, what would you suggest? To check whether we have acquired the lock or not and do it conditionally?> > > Something along those lines. > > Either a "_locked" version of "conn_slots_available" function pointer, > a parameter, or a check. > > What you suggested is fine though for the immediate syzbot need. > FWIW, in UEK (the modified Linux kernel that Oracle uses), this issue reported by syzbot was addressed differently: https://github.com/oracle/linux-uek/commit/a94abc444c487 The commit under discussion here originally came from: https://github.com/oracle/linux-uek/commit/ebf71f5b6c29c and pre-dates: 9dfc685e0262 ("inet: remove races in inet{6}_getname()") which is why UEK didn't have this deadlock issue reported by syszbot. If the objective is to keep divergence of UEK and Upstream to a minimum, it may be worthwhile to consider adopting the same fix we carry in UEK. Thanks, Gerd