witness: acquiring duplicate lock of same type: "&sc->sc_lock"
 1st wsmuxlk @ /syzkaller/managers/multicore/kernel/sys/dev/wscons/wsmux.c:245
 2nd wsmuxlk @ /syzkaller/managers/multicore/kernel/sys/dev/wscons/wsmux.c:245
Starting stack trace...
witness_checkorder(ffff800001979ed0,1,ffffffff81f36129,f5,0) at witness_checkorder+0xe14 witness_debugger sys/kern/subr_witness.c:2650 [inline]
witness_checkorder(ffff800001979ed0,1,ffffffff81f36129,f5,0) at witness_checkorder+0xe14 sys/kern/subr_witness.c:926
_rw_enter_read(ffff800001979ec0,ffffffff81f36129,f5) at _rw_enter_read+0x80 sys/kern/kern_rwlock.c:102
wsmux_mux_open(ffff800001979e00,ffff800000026d50) at wsmux_mux_open+0x82 wsmux_do_open sys/dev/wscons/wsmux.c:246 [inline]
wsmux_mux_open(ffff800001979e00,ffff800000026d50) at wsmux_mux_open+0x82 sys/dev/wscons/wsmux.c:228
wsmuxopen(4500,21,2000,ffff800020b42e28) at wsmuxopen+0x179 wsmux_do_open sys/dev/wscons/wsmux.c:258 [inline]
wsmuxopen(4500,21,2000,ffff800020b42e28) at wsmuxopen+0x179 sys/dev/wscons/wsmux.c:204
spec_open(ffff800020c356d0) at spec_open+0x217 sys/kern/spec_vnops.c:158
VOP_OPEN(fffffd8066161358,21,fffffd807f7c7ae0,ffff800020b42e28) at VOP_OPEN+0x76 sys/kern/vfs_vops.c:153
vn_open(ffff800020c358c0,21,0) at vn_open+0x4c6 sys/kern/vfs_vnops.c:174
doopenat(ffff800020b42e28,ffffff9c,20000000,20,0,ffff800020c35b00) at doopenat+0x2be sys/kern/vfs_syscalls.c:1045
syscall(ffff800020c35bb0) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline]
syscall(ffff800020c35bb0) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574
Xsyscall(6,0,ffffffffffffffb1,0,4,9bd7797f010) at Xsyscall+0x128
end of kernel
end trace frame: 0x9bff75b8f30, count: 247
End of stack trace.
Stopped at      db_enter+0x18:  addq    $0x8,%rsp