panic: kernel diagnostic assertion "dupe == NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/uvm/uvm_page.c", line 144 Starting stack trace... panic(ffffffff833aa43c) at panic+0x1d0 sys/kern/subr_prf.c:229 __assert(ffffffff833e8e72,ffffffff833d7265,90,ffffffff8337dad0) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pagealloc_pg(fffffd80085f0ba0,fffffd800b062738,8861000,0) at uvm_pagealloc_pg+0x54b sys/uvm/uvm_page.c:707 uvm_pagealloc(fffffd800b062738,8861000,0,3) at uvm_pagealloc+0x252 sys/uvm/uvm_page.c:913 pmap_get_ptp(fffffd800b062700,110c232000) at pmap_get_ptp+0x1d0 sys/arch/amd64/amd64/pmap.c:-1 pmap_enter(fffffd800b062700,110c232000,6cb9e000,1,20) at pmap_enter+0x386 sys/arch/amd64/amd64/pmap.c:-1 uvm_fault_lower_lookup(ffff8000333dd500,ffff8000333dd538,ffff8000333dd480) at uvm_fault_lower_lookup+0x3d6 sys/uvm/uvm_fault.c:-1 uvm_fault_lower(ffff8000333dd500,ffff8000333dd538,ffff8000333dd480) at uvm_fault_lower+0x89 sys/uvm/uvm_fault.c:1348 uvm_fault(fffffd805c366d80,110c230000,0,1) at uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 WARNING: SPL NOT LOWERED uOpNa gTeRflAPtt EraXpI(Tf faf f0 8Stopped at proc_trampoline+0xc7: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND 449845 51789 0 0x10 0 1 syz-executor *406994 20808 0 0x2 0 0 syz-executor proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x705c0b21acd0, count: 14 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu1: kernel diagnostic assertion "dupe == NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/uvm/uvm_page.c", line 144 ddb{0}> trace proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x705c0b21acd0, count: -1 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80002a3bae40 rbx 0 rdx 0 rcx 0xffff8000313d6558 rax 0x2a r8 0xffff80002a3bad70 r9 0 r10 0x7932b31b291af708 r11 0xecb9b6f2cc8b0448 r12 0 r13 0 r14 0 r15 0 rip 0xffffffff8196c4c7 proc_trampoline+0xc7 cs 0x8 rflags 0x246 rsp 0xffff80002a3badc0 ss 0x10 proc_trampoline+0xc7: movl $0,%gs:0x688 ddb{0}> show proc PROC (syz-executor) tid=406994 pid=20808 tcnt=1 stat=onproc flags process=2 proc=0 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002f3c4030,0xffff80002f3c5798 process=0xffff80002a3be1c8 user=0xffff80002a3b5000, vmspace=0xfffffd806f7667a8 estcpu=36, cpticks=145, pctcpu=0.49, user=4, sys=120, intr=20 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 51789 449845 98362 0 7 0x10 syz-executor 51789 326827 98362 0 3 0x4000090 fsleep syz-executor 28620 162326 83082 0 3 0x80 nanoslp syz-executor 28620 335606 83082 0 2 0x4000000 syz-executor 54123 208566 45922 0 2 0 syz-executor 54123 464201 45922 0 3 0x4000080 sbwait syz-executor 32702 164916 90911 0 3 0x80 nanoslp syz-executor 32702 373595 90911 0 3 0x4000080 ttyopn syz-executor 32702 385319 90911 0 3 0x4000080 fsleep syz-executor 90911 78986 41239 0 3 0x82 nanoslp syz-executor 82705 22370 0 0 3 0x14280 nfsidl nfsio 84683 198727 41239 0 3 0x82 nanoslp syz-executor 46923 370708 41239 0 3 0x82 nanoslp syz-executor *20808 406994 41239 0 7 0x2 syz-executor 83082 517577 41239 0 3 0x82 nanoslp syz-executor 45922 43429 41239 0 3 0x82 nanoslp syz-executor 98362 33195 41239 0 3 0x82 nanoslp syz-executor 71510 518223 41239 0 3 0x82 nanoslp syz-executor 41239 349165 68818 0 2 0x2 syz-executor 68818 70685 74593 0 3 0x10008a sigsusp ksh 74593 186118 65243 0 3 0x98 kqread sshd-session 65243 143380 23585 0 3 0x92 kqread sshd-session 49902 239094 1 0 3 0x100083 ttyin getty 23585 35634 1 0 3 0x88 kqread sshd 935 350105 12146 74 3 0x1100092 bpf pflogd 12146 409992 1 0 3 0x80 sbwait pflogd 84047 414680 91174 73 3 0x1100090 kqread syslogd 91174 39174 1 0 3 0x100082 sbwait syslogd 26810 81113 1 0 3 0x100080 kqread resolvd 4957 248416 95172 77 3 0x100092 kqread dhcpleased 27858 409569 95172 77 3 0x100092 kqread dhcpleased 95172 61148 1 0 3 0x80 kqread dhcpleased 20059 16828 0 0 3 0x14200 bored smr 9843 48088 0 0 2 0x14200 zerothread 83524 144637 0 0 3 0x14200 aiodoned aiodoned 51552 286008 0 0 3 0x14200 syncer update 86479 102060 0 0 3 0x14200 cleaner cleaner 35924 58338 0 0 3 0x14200 reaper reaper 9520 486814 0 0 3 0x14200 pgdaemon pagedaemon 12160 474823 0 0 3 0x14200 bored viomb 83925 349524 0 0 3 0x40014200 acpi0 acpi0 22571 111963 0 0 3 0x40014200 idle1 13843 523390 0 0 3 0x14200 bored softnet1 49162 18447 0 0 3 0x14200 bored softnet0 52604 222183 0 0 3 0x14200 smrbar systqmp 4994 431538 0 0 3 0x14200 bored systq 87049 378760 0 0 3 0x14200 tmoslp softclockmp 86999 323227 0 0 3 0x40014200 tmoslp softclock 51470 58450 0 0 3 0x40014200 idle0 1 495308 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks CPU 0: fatal protection fault in supervisor mode trap type 4 code 0 rip ffffffff82b0acdf cs 8 rflags 10202 cr2 54488564fb6 cpl d rsp ffff80002a3baa10 gsbase 0xffffffff83806ff0 kgsbase 0x0 panic: trap type 4, code=0, pc=ffffffff82b0acdf Parallel traceback, suppressed...