kernel panic at /syzkaller/managers/main/kernel/kern/include/kref.h:61, from core 2: nbuf 37, STAT_FIX_LEN_9P 49 assertion failed: krefBIT16SZ 2, GBIT16(buf) 0 
This is bad!
Stack Backtrace on Core 2:
#01 [<0xffffffffc200a3e7>] in backtrace at src/kdebug.c:219
#02 [<0xffffffffc2009bb2>] in _panic at src/init.c:273
#03 [<0xffffffffc20495e6>] in kref_get at include/kref.h:61
#04 [<     [inline]     >] in proc_incref.10194 at src/process.c:563
#04 [<0xffffffffc204961e>] in enum_proc.10194 at src/process.c:2346
#05 [<0xffffffffc20091b1>] in hash_for_each at src/hashtable.c:427
#06 [<0xffffffffc204eb17>] in proc_get_set at src/process.c:2367
#07 [<0xffffffffc2045de1>] in profiler_emit_current_system_status at src/profiler.c:270
#08 [<0xffffffffc2045f03>] in profiler_setup at src/profiler.c:421
#09 [<0xffffffffc207b07a>] in kprof_open at drivers/dev/kprof.c:228
#10 [<0xffffffffc2033a10>] in __namec_from at src/ns/chan.c:1225
#11 [<0xffffffffc20341ef>] in namec at src/ns/chan.c:1509
#12 [<0xffffffffc20416d6>] in sysopenat at src/ns/sysfile.c:590
#13 [<0xffffffffc205881f>] in sys_openat at src/syscall.c:1805
#14 [<0xffffffffc20593c9>] in syscall at src/syscall.c:2528
#15 [<0xffffffffc2059584>] in run_local_syscall at src/syscall.c:2563
#16 [<0xffffffffc2059ab9>] in prep_syscalls at src/syscall.c:2583
#17 [<0xffffffffc20ab29a>] in sysenter_callwrapper at arch/x86/trap.c:851