On Tue, Sep 07, 2021 at 09:59:22PM -0500, j...@jcs.org wrote: > >Synopsis: ppp panic: locking against myself > >Category: kernel > >Environment: > System : OpenBSD 6.9 > Details : OpenBSD 6.9 (GENERIC) #2: Tue Aug 10 08:12:32 MDT 2021 > > r...@syspatch-69-i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC > > Architecture: OpenBSD.i386 > Machine : i386 > >Description: > Running pppd over a serial modem. (What year is it?) > > Ran pkg_add vim--no_x11, came back a half hour later and it had > panicked while installing the last dependency. > > com0: 2 silo overflows, 0 ibuf overflows > com0: 2 silo overflows, 0 ibuf overflows > com0: 2 silo overflows, 0 ibuf overflows > com0: 1 silo overflow, 0 ibuf overflows > com0: 4 silo overflows, 0 ibuf overflows > panic: mtx 0xd14b3054: locking against myself > Stopped at db_enter+0x4: popl %ebp > panic: mtx 0xd14b3054: locking against myself > Stopped at db_enter+0x4: popl %ebp > TID PID UID PRFLAGS PFLAGS CPU COMMAND > > * 67354 3343 0 0x14000 0x200 0 softnet > > db_enter() at db_enter+0x4 > panic(d0bc8c2b) at panic+0xd3 > mtx_enter(d14b3054) at mtx_enter+0x4e > task_add(d14b3040,d0df4d7c) at task_add+0x1d > ppp_restart(d1511800) at ppp_restart+0x3a > pppstart(d17d2200) at pppstart+0x55 > comintr(d14da000) at comintr+0x4a5 > intr_handler(f17d69d8,d14b3740) at intr_handler+0x18 > Xintr_legacy4_untramp() at Xintr_legacy4_untramp+0xfb > taskq_next_work(d14b3040,f17d6a40) at taskq_next_work+0x8d > taskq_thread(d14b3040) at taskq_thread+0x43 > https://www.openbsd.org/ddb.html describes the minimum info required in bug > reports. Insufficient info makes it difficult to find and fix bugs.
Looks like it's trying to schedule a task while already handling one. The mutex associated with each net task queue have their IPL set to IPL_NET whereas IPL_TTY is probably needed here.
