panic: mtx_lock_spin: recursed on non-recursive mutex vtbuf @ ..

Hi,

I was using the mouse in tmux on v1 when everying stopped.
Sadly we didn't switch to v0 for console but it seems I managed to get a dump only checking now; the kernel from then is already gone.

core.txt said.

panic: mtx_lock_spin: recursed on non-recursive mutex vtbuf @ /usr/home/test/Sources/git/FreeBSD/freebsd-src.git/sys/dev/vt/vt_buf.c:744

cpuid = 1
time = 1779437567
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00d773e7a0
vpanic() at vpanic+0x149/frame 0xfffffe00d773e8d0
panic() at panic+0x43/frame 0xfffffe00d773e930
__mtx_lock_spin_flags() at __mtx_lock_spin_flags+0x11b/frame 0xfffffe00d773e970
vtbuf_flush_mark() at vtbuf_flush_mark+0x82/frame 0xfffffe00d773e9b0
vtbuf_unmark_on_cross() at vtbuf_unmark_on_cross+0xcc/frame 0xfffffe00d773e9d0
vtterm_fill() at vtterm_fill+0x27/frame 0xfffffe00d773ea00
teken_subr_erase_line() at teken_subr_erase_line+0x90/frame 0xfffffe00d773ea20
teken_state_2() at teken_state_2+0x497/frame 0xfffffe00d773ea40
teken_input_char() at teken_input_char+0x47/frame 0xfffffe00d773ea60
teken_input() at teken_input+0x9f/frame 0xfffffe00d773ea90
termtty_outwakeup() at termtty_outwakeup+0xcf/frame 0xfffffe00d773eb60
ttydisc_write() at ttydisc_write+0x337/frame 0xfffffe00d773ecd0
ttydev_write() at ttydev_write+0x13f/frame 0xfffffe00d773ed10
devfs_write_f() at devfs_write_f+0xf3/frame 0xfffffe00d773ed70
dofilewrite() at dofilewrite+0x81/frame 0xfffffe00d773edc0
sys_writev() at sys_writev+0x69/frame 0xfffffe00d773ee00
amd64_syscall() at amd64_syscall+0x168/frame 0xfffffe00d773ef30
fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe00d773ef30
--- syscall (121, FreeBSD ELF64, writev), rip = 0x82601d5aa, rsp = 0x8207a3408, rbp = 0x8207a3430 ---
KDB: enter: panic


In case it helps, I believe this is file:line as reported by gdb in core.txt:

     at /usr/home/test/Sources/git/FreeBSD/freebsd-src.git/sys/kern/kern_mutex.c:353
     at /usr/home/test/Sources/git/FreeBSD/freebsd-src.git/sys/dev/vt/vt_buf.c:744
     at /usr/home/test/Sources/git/FreeBSD/freebsd-src.git/sys/dev/vt/vt_buf.c:864
     at /usr/home/test/Sources/git/FreeBSD/freebsd-src.git/sys/dev/vt/vt_buf.c:210
     at /usr/home/test/Sources/git/FreeBSD/freebsd-src.git/sys/dev/vt/vt_buf.c:232
     at /usr/home/test/Sources/git/FreeBSD/freebsd-src.git/sys/dev/vt/vt_core.c:1201
     at /usr/home/test/Sources/git/FreeBSD/freebsd-src.git/sys/teken/teken.c:121
     at /usr/home/test/Sources/git/FreeBSD/freebsd-src.git/sys/teken/teken_subr.h:558
     at /usr/home/test/Sources/git/FreeBSD/freebsd-src.git/sys/teken/teken.c:255
     at /usr/home/test/Sources/git/FreeBSD/freebsd-src.git/sys/teken/teken.c:284
     at /usr/home/test/Sources/git/FreeBSD/freebsd-src.git/sys/teken/teken.c:317
     at /usr/home/test/Sources/git/FreeBSD/freebsd-src.git/sys/kern/subr_terminal.c:422
     at /usr/home/test/Sources/git/FreeBSD/freebsd-src.git/sys/sys/ttydevsw.h:114
     at /usr/home/test/Sources/git/FreeBSD/freebsd-src.git/sys/kern/tty_ttydisc.c:658
     at /usr/home/test/Sources/git/FreeBSD/freebsd-src.git/sys/kern/tty.c:550
     at /usr/home/test/Sources/git/FreeBSD/freebsd-src.git/sys/fs/devfs/devfs_vnops.c:1980
     at /usr/home/test/Sources/git/FreeBSD/freebsd-src.git/sys/sys/file.h:372
     at /usr/home/test/Sources/git/FreeBSD/freebsd-src.git/sys/kern/sys_generic.c:565
     at /usr/home/test/Sources/git/FreeBSD/freebsd-src.git/sys/kern/sys_generic.c:492
     at /usr/home/test/Sources/git/FreeBSD/freebsd-src.git/sys/kern/sys_generic.c:478
     at /usr/home/test/Sources/git/FreeBSD/freebsd-src.git/sys/amd64/amd64/../../kern/subr_syscall.c:193


-- 
Bjoern A. Zeeb                                                     r15:7