syzbot

kernel warning at kern/src/printfmt.c:189, from core 0: _x && _x < ULIM
Stack Backtrace on Core 0:
#01 [<0xffffffffc200a42c>] in backtrace at src/kdebug.c:235
#02 [<0xffffffffc2009c54>] in _warn at src/init.c:326
#03 [<0xffffffffc20490f4>] in vprintfmt at src/printfmt.c:189
#04 [<0xffffffffc2049322>] in vsnprintf at src/printfmt.c:328
#05 [<0xffffffffc2058549>] in vset_errstr at src/syscall.c:509
#06 [<0xffffffffc205867b>] in set_error at src/syscall.c:542
#07 [<0xffffffffc207d6fe>] in kprof_write at drivers/dev/kprof.c:416
#08 [<0xffffffffc2040649>] in rwrite at src/ns/sysfile.c:1117
#09 [<0xffffffffc204089b>] in syswrite at src/ns/sysfile.c:1135
#10 [<0xffffffffc20593f9>] in sys_write at src/syscall.c:1785
#11 [<0xffffffffc2059f59>] in syscall at src/syscall.c:2577
#12 [<0xffffffffc205ab08>] in run_local_syscall at src/syscall.c:2614
#13 [<0xffffffffc205b049>] in prep_syscalls at src/syscall.c:2634
#14 [<0xffffffffc20ac912>] in sysenter_callwrapper at arch/x86/trap.c:877