Bezüglich Harry Schmalzbauer's Nachricht vom 07.03.2017 19:44 (localtime): > Bezüglich Harry Schmalzbauer's Nachricht vom 07.03.2017 13:42 (localtime): > … >> Something ufs related seems to have tightened the unionfs locking >> problem in stable/11. Now the machine instantaniously panics during >> boot after mounting root with Rick's latest patch. >> >> Unfortunately I don't have SWAP available on that machine (yet), but >> maybe shit is a hint for anybody. >> >> db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame >> 0xfffffe00982220e0 >> vpanic() at vpanic+0x186/frame 0xfffffe0098222160 >> kassert_panic() at kassert_panic+0x126/frame 0xfffffe00982221d0 >> witness_assert() at witness_assert+0x35a/frame 0xfffffe0098222230 >> __lockmgr_args() at __lockmgr_args+0x517/frame 0xfffffe00982222d0 >> vop_stdunlock() at vop_stdunlock+0x3b/frame 0xfffffe00982222f0 >> VOP_UNLOCK_APV() at VOP_UNLOCK_APV+0xe0/frame 0xfffffe0098222320 >> unionfs_unlock() at unionfs_unlock+0x112/frame 0xfffffe0098222390 >> VOP_UNLOCK_APV() at VOP_UNLOCK_APV+0xe0/frame 0xfffffe00982223c0 >> unionfs_nodeget() at unionfs_nodeget+0x3ef/frame 0xfffffe0098222470 >> unionfs_domount() at unionfs_domount+0x518/frame 0xfffffe00982226b0 >> vfs_donmount() at vfs_donmount+0xe37/frame 0xfffffe00982228f0 >> sys_nmount() at sys_nmount+0x72/frame 0xfffffe0098222930 >> amd64_syscall() at amd64_syscall+0x2f9/frame 0xfffffe0098222ab0 >> Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe0098222ab0 >> --- syscall (378, FreeBSD ELF64, sys_nmount), rip = 0x80086ecea, rsp = >> 0x7fffffffe318, rbp = 0x7fffffffeca0 --- > New discovery: > Rick's latest patch casues panic only with KDB. If I compile a kernel > without witenss and KDB, the machine boots fine! > Also, it's at least not so easy anymore to trigger the deadlock :-) . I > need to do more testing but until now Rick's approach seems very > promising :-) .
My unionfs deadlock problem isn't really solved with Rick's latest patch, I still can reproduce it: krb5.conf and krb5.keytab are files on unionfs referenced by /etc. libexec/negotiate_kerberos_auth reads these and if I have enough helper processes handling requests, the deadlock occurs. _But_: If I move the files outside the unionfs and create a symlink, I cannot reproduce the deadlock anymore, which was similar easily reproducable without it or any of the other workarounds. So it looks like I have an acceptable solution for now, although it's only usable under certain conditions. Unfortunately I can't do tests with a debug kernel since the patch prevents the system with the debug kernel from starting up. But if this was ironed out, I'd happily provide more info. Thanks, -Harry _______________________________________________ freebsd-stable@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
