Hi, That may very well be a problem introduced by the move of connects to first worker. Unfortunately, I we don’t have tests for all of those corner cases yet.
However, to replicate this issue, could you provide a bit more details about your setup and the exact backtrace? It looks like you’re leverage cut-through sessions so the server and client are attached to the same vpp instance? Also, could you try vpp latest to see check if the issue still persists? Regards, Florin > On Mar 19, 2023, at 1:53 AM, chenwei...@outlook.com wrote: > > Hi vpp-team, > I'm new to VPP and I'm trying to run Redis 6.0.18 in VCL with LD_PRELOAD > using VPP 22.10 and VPP 23.02. I found that assert fails frequently in VPP > 23.02, and after checking, I found that the assert fails in the session_get > function in vnet/session/session.h. The cause was an invalid session_id with > a value of -1 (or ~0). > This function is called by the session_half_open_migrate_notify function in > vnet/session/session.c, which is called by ct_accept_one in > vnet/session/application_local.c. Function ct_accept_one is called because of > an accept RPC request handled by the session_event_dispatch_ctrl function > from the ct_connect function in vnet/session/application_local.c. Function > ct_connect allocates and initializes a half-open transport object. However, > its c_s_index value is -1 (or ~0), i.e., no session is allocated. allocating > a session is implemented by calling session_alloc_for_half_open in the > session_open_vc function of ct_connect (located in vnet/session/session.c). > Therefore, I think the assertion failure is a case that ct_accept_one > function accesses half-open tc without a session being allocated. > I found that this problem does not exist on VPP 22.10. I checked the > patches between 22.10 and 23.02 and found “session: move connects to first > worker (https://gerrit.fd.io/r/c/vpp/+/35713)” that might be related to this > issue, but I can't give a definite statement and I don’t know how fix it. I > would be very grateful if you could address this issue. > Thanks, > > >
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