uvm_fault(0xffffffff839e3ac8, 0xffff8000296c2000, 0, 2) -> d kernel: page fault trap, code=2 Stopped at memset+0x52: repe stosq %es:(%rdi) TID PID UID PRFLAGS PFLAGS CPU COMMAND *157973 3742 0 0x1004 0 0 syz-executor memset() at memset+0x52 VOP_WRITE(fffffb0074504b30,ffff80002a7c6a60,0,fffffb0007ffd478) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 uvn_io(fffffb007a346a58,ffff80002a7c6be0,7,39,1) at uvn_io+0x485 sys/uvm/uvm_vnode.c:1232 uvm_pager_put(fffffb007a346a58,fffffb0007992900,ffff80002a7c6c80,ffff80002a7c6ca4,39,0,a016be66124547b8) at uvm_pager_put+0x10a sys/uvm/uvm_pager.c:531 uvn_flush(fffffb007a346a58,0,0,19) at uvn_flush+0x68d sys/uvm/uvm_vnode.c:705 uvn_detach(fffffb007a346a58) at uvn_detach+0xb8 sys/uvm/uvm_vnode.c:344 uvm_unmap_detach(ffff80002a7c6dc8,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1370 uvmspace_exec(ffff80002a767a00,1000,7f7fffffc000) at uvmspace_exec+0x451 sys/uvm/uvm_map.c:3404 sys_execve(ffff80002a767a00,ffff80002a7c7450,ffff80002a7c73a0) at sys_execve+0xc61 sys/kern/kern_exec.c:474 syscall(ffff80002a7c7450) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a7c7450) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73d59a4f4b90, count: 4 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: uvm_fault(0xffffffff839e3ac8, 0xffff8000296c2000, 0, 2) -> d ddb> show kasan No such command ddb> trace memset() at memset+0x52 VOP_WRITE(fffffb0074504b30,ffff80002a7c6a60,0,fffffb0007ffd478) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 uvn_io(fffffb007a346a58,ffff80002a7c6be0,7,39,1) at uvn_io+0x485 sys/uvm/uvm_vnode.c:1232 uvm_pager_put(fffffb007a346a58,fffffb0007992900,ffff80002a7c6c80,ffff80002a7c6ca4,39,0,a016be66124547b8) at uvm_pager_put+0x10a sys/uvm/uvm_pager.c:531 uvn_flush(fffffb007a346a58,0,0,19) at uvn_flush+0x68d sys/uvm/uvm_vnode.c:705 uvn_detach(fffffb007a346a58) at uvn_detach+0xb8 sys/uvm/uvm_vnode.c:344 uvm_unmap_detach(ffff80002a7c6dc8,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1370 uvmspace_exec(ffff80002a767a00,1000,7f7fffffc000) at uvmspace_exec+0x451 sys/uvm/uvm_map.c:3404 sys_execve(ffff80002a767a00,ffff80002a7c7450,ffff80002a7c73a0) at sys_execve+0xc61 sys/kern/kern_exec.c:474 syscall(ffff80002a7c7450) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a7c7450) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73d59a4f4b90, count: -11 ddb> show registers rdi 0xffff8000296c2000 rsi 0 rbp 0xffff80002a7c69c0 rbx 0xe rdx 0 rcx 0x800 rax 0 r8 0x4000 __ALIGN_SIZE+0x3000 r9 0xffff80002a7c6848 r10 0xe1eea80535649846 r11 0xffff8000296c2000 r12 0x4000 __ALIGN_SIZE+0x3000 r13 0x4000 __ALIGN_SIZE+0x3000 r14 0xffff8000296c2000 r15 0x4000 __ALIGN_SIZE+0x3000 rip 0xffffffff8298b4e2 memset+0x52 cs 0x8 rflags 0x10206 __ALIGN_SIZE+0xf206 rsp 0xffff80002a7c68f8 ss 0x10 memset+0x52: repe stosq %es:(%rdi) ddb> show proc PROC (syz-executor) tid=157973 pid=3742 tcnt=1 stat=onproc flags process=1004 proc=0 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a767a00 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a766a70,0xffffffff83a53a50 process=0xffff80002a744d88 user=0xffff80002a7c2000, vmspace=0xfffffb007f2345c0 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND * 3742 157973 1 0 7 0x1004 0 syz-executor 22965 493499 1 0 2 0x2 0 syz-executor 59825 36682 1 0 3 0 0x80 nanoslp init 21362 161124 0 0 3 0x14000 0x280 nfsidl nfsio 13520 241266 0 0 3 0x14000 0x280 nfsidl nfsio 43274 91867 0 0 3 0x14000 0x280 nfsidl nfsio 75956 53373 0 0 3 0x14000 0x280 nfsidl nfsio 30292 63806 0 0 3 0x14000 0x280 nfsidl nfsio 62335 193459 0 0 3 0x14000 0x280 nfsidl nfsio 58073 377224 0 0 3 0x14000 0x280 nfsidl nfsio 20042 101059 0 0 3 0x14000 0x280 nfsidl nfsio 84111 458823 0 0 3 0x14000 0x280 nfsidl nfsio 1804 517796 0 0 3 0x14000 0x280 nfsidl nfsio 25213 342681 0 0 3 0x14000 0x280 nfsidl nfsio 26910 202690 0 0 3 0x14000 0x280 nfsidl nfsio 46591 455329 0 0 3 0x14000 0x280 nfsidl nfsio 22457 352545 0 0 3 0x14000 0x280 nfsidl nfsio 10661 28432 0 0 3 0x14000 0x280 nfsidl nfsio 48124 429434 0 0 3 0x14000 0x280 nfsidl nfsio 31500 454369 0 0 3 0x14000 0x280 nfsidl nfsio 92836 68380 0 0 3 0x14000 0x280 nfsidl nfsio 58905 327824 0 0 3 0x14000 0x280 nfsidl nfsio 35485 3997 0 0 3 0x14000 0x280 nfsidl nfsio 31229 215448 0 0 3 0x14000 0x200 bored smr 63291 416395 0 0 2 0x14000 0x200 zerothread 40456 89047 0 0 3 0x14000 0x200 aiodoned aiodoned 496 450153 0 0 3 0x14000 0x200 syncer update 53153 291798 0 0 3 0x14000 0x200 cleaner cleaner 78656 294726 0 0 3 0x14000 0x200 reaper reaper 97745 142810 0 0 3 0x14000 0x200 pgdaemon pagedaemon 23721 206261 0 0 3 0x14000 0x200 bored viomb 68133 363499 0 0 3 0x14000 0x40000200 acpi0 acpi0 79821 235933 0 0 2 0x14000 0x200 softnet0 84651 267007 0 0 3 0x14000 0x200 smrbar systqmp 32366 72442 0 0 3 0x14000 0x200 bored systq 55760 2751 0 0 3 0x14000 0x40000200 tmoslp softclock 15643 487691 0 0 3 0x14000 0x40000200 idle0 1 409679 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10010000 0x200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11008 12084K 12959K 166960K 13362 0 pcb 17 15K 16K 166960K 168 0 rtable 89 6K 10K 166960K 1064 0 pf 18 11K 17K 166960K 154 0 ifaddr 11 1K 7K 166960K 149 0 ifgroup 21 1K 2K 166960K 179 0 sysctl 2 1K 9K 166960K 13 0 counters 26 16K 18K 166960K 110 0 ioctlops 0 0K 4K 166960K 273 0 iov 0 0K 12K 166960K 129 0 mount 1 1K 1K 166960K 1 0 log 3 0K 0K 166960K 7 0 vnodes 1413 89K 89K 166960K 2206 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 14 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 40 0 dirhash 12 2K 2K 166960K 30 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 2 2K 89K 166960K 1083 0 sigio 0 0K 0K 166960K 12 0 proc 11 17K 83K 166960K 1111 0 subproc 0 0K 4K 166960K 243 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 66 0 in_multi 11 0K 7K 166960K 363 0 ether_multi 1 0K 0K 166960K 4 0 mrt 0 0K 0K 166960K 19 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 73 334K 334K 166960K 73 0 exec 1 0K 1K 166960K 791 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 3 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 12 10K 166K 166960K 10156 0 UVM aobj 93 3K 3K 166960K 97 0 pinsyscall 5 10K 92K 166960K 2716 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 22 0 NDP 4 0K 1K 166960K 108 0 temp 19 9112K 9176K 166960K 35413 0 kqueue 0 0K 26K 166960K 152 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 119 0 119 1 0 1 1 0 8 1 rtentry 136 360 0 338 4 0 4 4 0 8 3 unpcb 144 498 0 498 6 0 6 6 0 8 6 syncache 336 10 0 10 1 0 1 1 0 8 1 tcpcb 736 173 0 172 1 0 1 1 0 8 0 arp 96 57 0 55 1 0 1 1 0 8 0 ipq 40 1 0 1 1 0 1 1 0 8 1 ipqe 40 4 0 4 1 0 1 1 0 8 1 inpcb 328 695 0 694 9 0 9 9 0 8 8 ip6q 72 1 0 0 1 0 1 1 0 8 0 ip6af 40 1 0 0 1 0 1 1 0 8 0 nd6 112 95 0 95 1 0 1 1 0 8 1 pkpcb 40 10 0 10 1 0 1 1 0 8 1 kcovpl 48 27 0 27 1 0 1 1 0 8 1 ppxss 1072 52 0 52 1 0 1 1 0 8 1 pfstscr 40 13 0 8 1 0 1 1 0 8 0 pfosfp 40 1 0 0 1 0 1 1 0 8 0 pfosfpen 112 1 0 0 1 0 1 1 0 8 0 pfrktable 1344 4 0 2 1 0 1 1 0 8 0 pfsrclim 320 2 0 2 1 0 1 1 0 8 1 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pftag 88 2 0 0 1 0 1 1 0 8 0 pfqueue 320 1 0 1 1 0 1 1 0 8 1 pfstitem 24 9 0 2 1 0 1 1 0 8 0 pfstkey 128 15 0 6 1 0 1 1 0 8 0 pfstate 384 9 0 5 1 0 1 1 0 8 0 pfrule 1360 8 0 6 1 0 1 1 0 8 0 rttmr 136 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1619 0 1474 32 5 27 32 0 8 15 art_table 40 1620 0 1474 6 0 6 6 0 8 1 art_node 32 358 0 338 1 0 1 1 0 8 0 sysvmsgpl 40 18 0 8 1 0 1 1 0 8 0 semupl 112 3 0 3 1 0 1 1 0 8 1 semapl 72 35 0 25 1 0 1 1 0 8 0 shmpl 112 94 0 4 3 0 3 3 0 8 0 dirhash 1024 29 0 12 3 0 3 3 0 8 0 dino2pl 256 2783 0 1301 94 0 94 94 0 8 0 ffsino 256 2797 0 1315 94 0 94 94 0 8 0 nchpl 144 3939 0 2187 66 0 66 66 0 8 0 rtmask 32 5 0 5 1 0 1 1 0 8 1 vnodes 216 3506 0 0 195 0 195 195 0 8 0 namei 1024 14385 0 14384 2 0 2 2 0 8 1 pfiaddrpl 120 2 0 0 1 0 1 1 0 8 0 kstatmem 264 97 0 88 3 0 3 3 0 8 1 scxspl 216 17668 0 17668 8 0 8 8 1 8 8 plimitpl 152 160 0 159 1 0 1 1 0 8 0 sigapl 424 1368 0 1330 8 0 8 8 0 8 2 knotepl 120 28057 0 28057 28 20 8 16 0 8 8 kqueuepl 184 253 0 253 4 0 4 4 0 8 4 pipepl 304 253 0 247 4 0 4 4 0 8 2 fdescpl 448 1333 0 1328 5 0 5 5 0 8 3 filepl 120 6091 0 6079 11 0 11 11 0 8 7 lockfpl 104 314 0 314 1 0 1 1 0 8 1 lockfspl 48 137 0 137 1 0 1 1 0 8 1 sessionpl 144 67 0 65 1 0 1 1 0 8 0 pgrppl 48 118 0 115 1 0 1 1 0 8 0 ucredpl 104 815 0 813 1 0 1 1 0 8 0 zombiepl 144 1330 0 1330 1 0 1 1 0 8 1 processpl 1152 1368 0 1330 5 0 5 5 0 8 1 procpl 664 2307 0 2269 7 0 7 7 0 8 1 sockpl 552 1378 0 1377 11 2 9 11 0 8 8 mcl64k 65536 41 0 41 1 0 1 1 0 8 1 mcl16k 16384 9 0 9 1 0 1 1 0 8 1 mcl12k 12288 7 0 7 1 0 1 1 0 8 1 mcl9k128 9344 4 0 4 1 0 1 1 0 8 1 mcl8k 8192 13 0 13 1 0 1 1 0 8 1 mcl4k 4096 3614 0 3563 13 0 13 13 0 8 5 mcl2k2 2112 2 0 2 1 0 1 1 0 8 1 mcl2k 2048 646 0 646 5 0 5 5 0 8 5 mextrefs 64 445 0 445 1 0 1 1 0 8 1 mtagpl 96 6 0 6 1 0 1 1 0 8 1 mbufpl 256 15981 0 15908 20 0 20 20 0 8 7 bufpl 272 6870 0 654 415 0 415 415 0 8 0 anonpl 24 192483 0 192164 44 0 44 44 0 187 31 amapchunkpl 152 34294 0 34263 33 0 33 33 0 158 27 amappl16 200 2974 0 2974 20 12 8 15 0 8 8 amappl15 192 3 0 3 1 0 1 1 0 8 1 amappl14 184 647 0 647 1 0 1 1 0 8 1 amappl13 176 156 0 156 1 0 1 1 0 8 1 amappl12 168 1661 0 1659 2 0 2 2 0 8 0 amappl11 160 33 0 33 1 0 1 1 0 8 1 amappl10 152 60 0 60 1 0 1 1 0 8 1 amappl9 144 271 0 271 1 0 1 1 0 8 1 amappl8 136 216 0 216 1 0 1 1 0 8 1 amappl7 128 184 0 182 1 0 1 1 0 8 0 amappl6 120 341 0 340 1 0 1 1 0 8 0 amappl5 112 96 0 95 1 0 1 1 0 8 0 amappl4 104 323 0 321 1 0 1 1 0 8 0 amappl3 96 6525 0 6520 3 0 3 3 0 8 1 amappl2 88 688 0 681 2 0 2 2 0 8 0 amappl1 80 15383 0 15370 13 2 11 13 0 8 8 amappl 88 8990 0 8980 4 0 4 4 0 92 1 uvmvnodes 80 114 0 0 3 0 3 3 0 8 0 dma16384 16384 1 0 1 1 0 1 1 0 8 1 dma4096 4096 1 0 1 1 0 1 1 0 8 1 dma2048 2048 1 0 1 1 0 1 1 0 8 1 dma1024 1024 3 0 2 1 0 1 1 0 8 0 dma256 256 6 0 6 1 0 1 1 0 8 1 dma128 128 253 0 253 1 0 1 1 0 8 1 dma64 64 6 0 6 1 0 1 1 0 8 1 dma32 32 7 0 7 1 0 1 1 0 8 1 dma16 16 20 0 19 1 0 1 1 0 8 0 aobjpl 72 96 0 4 2 0 2 2 0 8 0 uaddrrnd 24 1333 0 1328 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1333 0 1328 1 0 1 1 0 8 0 vmmpekpl 168 11793 0 11775 3 0 3 3 0 8 1 vmmpepl 168 90819 0 90725 80 0 80 80 0 357 67 vmsppl 368 1332 0 1328 4 0 4 4 0 8 3 rwobjpl 40 25912 0 25673 11 0 11 11 0 8 0 pdppl 4096 2672 0 2656 138 98 40 78 0 8 24 pvpl 32 561232 0 561005 111 0 111 111 0 265 104 pmappl 216 1332 0 1328 2 0 2 2 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 837 0 103 22 0 22 22 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace memset() at memset+0x52 VOP_WRITE(fffffb0074504b30,ffff80002a7c6a60,0,fffffb0007ffd478) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 uvn_io(fffffb007a346a58,ffff80002a7c6be0,7,39,1) at uvn_io+0x485 sys/uvm/uvm_vnode.c:1232 uvm_pager_put(fffffb007a346a58,fffffb0007992900,ffff80002a7c6c80,ffff80002a7c6ca4,39,0,a016be66124547b8) at uvm_pager_put+0x10a sys/uvm/uvm_pager.c:531 uvn_flush(fffffb007a346a58,0,0,19) at uvn_flush+0x68d sys/uvm/uvm_vnode.c:705 uvn_detach(fffffb007a346a58) at uvn_detach+0xb8 sys/uvm/uvm_vnode.c:344 uvm_unmap_detach(ffff80002a7c6dc8,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1370 uvmspace_exec(ffff80002a767a00,1000,7f7fffffc000) at uvmspace_exec+0x451 sys/uvm/uvm_map.c:3404 sys_execve(ffff80002a767a00,ffff80002a7c7450,ffff80002a7c73a0) at sys_execve+0xc61 sys/kern/kern_exec.c:474 syscall(ffff80002a7c7450) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a7c7450) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73d59a4f4b90, count: -11 ddb> machine ddbcpu 1 No such command ddb> trace memset() at memset+0x52 VOP_WRITE(fffffb0074504b30,ffff80002a7c6a60,0,fffffb0007ffd478) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 uvn_io(fffffb007a346a58,ffff80002a7c6be0,7,39,1) at uvn_io+0x485 sys/uvm/uvm_vnode.c:1232 uvm_pager_put(fffffb007a346a58,fffffb0007992900,ffff80002a7c6c80,ffff80002a7c6ca4,39,0,a016be66124547b8) at uvm_pager_put+0x10a sys/uvm/uvm_pager.c:531 uvn_flush(fffffb007a346a58,0,0,19) at uvn_flush+0x68d sys/uvm/uvm_vnode.c:705 uvn_detach(fffffb007a346a58) at uvn_detach+0xb8 sys/uvm/uvm_vnode.c:344 uvm_unmap_detach(ffff80002a7c6dc8,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1370 uvmspace_exec(ffff80002a767a00,1000,7f7fffffc000) at uvmspace_exec+0x451 sys/uvm/uvm_map.c:3404 sys_execve(ffff80002a767a00,ffff80002a7c7450,ffff80002a7c73a0) at sys_execve+0xc61 sys/kern/kern_exec.c:474 syscall(ffff80002a7c7450) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a7c7450) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73d59a4f4b90, count: -11 ddb>