uvm_fault(0xfffffd806bd2de70, 0x3f, 0, 2) -> e kernel: page fault trap, code=2 Stopped at uao_detach+0xb9: movq %r15,0x40(%r12) TID PID UID PRFLAGS PFLAGS CPU COMMAND *507542 18816 0 0 0x4000000 0 syz-executor uao_detach(fffffd806f7128b8) at uao_detach+0xb9 sys/uvm/uvm_aobj.c:824 shm_deallocate_segment(fffffd806bd27c48) at shm_deallocate_segment+0x43 sys/kern/sysv_shm.c:152 sys_shmat(ffff80003c94ad18,ffff80003c9636f0,ffff80003c963640) at sys_shmat+0x559 sys/kern/sysv_shm.c:281 syscall(ffff80003c9636f0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c9636f0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9518dd3c820, count: 10 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(0xfffffd806bd2de70, 0x3f, 0, 2) -> e ddb> trace uao_detach(fffffd806f7128b8) at uao_detach+0xb9 sys/uvm/uvm_aobj.c:824 shm_deallocate_segment(fffffd806bd27c48) at shm_deallocate_segment+0x43 sys/kern/sysv_shm.c:152 sys_shmat(ffff80003c94ad18,ffff80003c9636f0,ffff80003c963640) at sys_shmat+0x559 sys/kern/sysv_shm.c:281 syscall(ffff80003c9636f0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c9636f0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9518dd3c820, count: -5 ddb> show registers rdi 0xffffffff rsi 0x9 rbp 0xffff80003c963540 rbx 0xfffffd806bd27c48 rdx 0 rcx 0xfffffd80694c9f90 rax 0xffff80003c94ad18 r8 0x200000001000 r9 0x3000 __ALIGN_SIZE+0x2000 r10 0x4a7060b4a2fe4314 r11 0x151957f00c968e51 r12 0xffffffffffffffff r13 0xffff800001463010 r14 0xfffffd806f7128b8 r15 0xffffffffffffffff rip 0xffffffff81d097a9 uao_detach+0xb9 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c963500 ss 0x10 uao_detach+0xb9: movq %r15,0x40(%r12) ddb> show proc PROC (syz-executor) tid=507542 pid=18816 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=73, usrpri=74, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c94a2b8,0xffff80002f900558 process=0xffff8000ffffba98 user=0xffff80003c95e000, vmspace=0xfffffd806bd2de70 estcpu=24, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 68489 304422 54487 0 2 0 syz-executor 68489 344843 54487 0 2 0x4000000 syz-executor 9020 481043 69817 0 2 0 syz-executor 9020 312558 69817 0 3 0x4000080 fsleep syz-executor 18816 514162 57592 0 2 0 syz-executor 18816 252313 57592 0 2 0x4000000 syz-executor *18816 507542 57592 0 7 0x4000000 syz-executor 18816 354010 57592 0 2 0x4000000 syz-executor 57817 42630 43217 0 2 0 syz-executor 57817 442331 43217 0 3 0x4000080 fsleep syz-executor 57817 290052 43217 0 3 0x4000080 fsleep syz-executor 64698 510949 1 0 3 0x80 nanoslp init 55769 121370 0 0 3 0x14280 nfsidl nfsio 59333 353727 0 0 3 0x14280 nfsidl nfsio 1142 165669 0 0 3 0x14280 nfsidl nfsio 34558 165823 0 0 3 0x14280 nfsidl nfsio 78981 508012 0 0 3 0x14280 nfsidl nfsio 41557 271055 0 0 3 0x14280 nfsidl nfsio 60551 419426 0 0 3 0x14280 nfsidl nfsio 46249 250452 0 0 3 0x14280 nfsidl nfsio 16852 146711 0 0 3 0x14280 nfsidl nfsio 12896 348018 0 0 3 0x14280 nfsidl nfsio 46068 516159 0 0 3 0x14280 nfsidl nfsio 81046 16625 0 0 3 0x14280 nfsidl nfsio 91468 475925 0 0 3 0x14280 nfsidl nfsio 7400 198628 0 0 3 0x14280 nfsidl nfsio 50005 375598 0 0 3 0x14280 nfsidl nfsio 49323 415985 0 0 3 0x14280 nfsidl nfsio 95258 469967 0 0 3 0x14280 nfsidl nfsio 98887 468261 0 0 3 0x14280 nfsidl nfsio 42772 64705 0 0 3 0x14280 nfsidl nfsio 39903 368481 0 0 3 0x14280 nfsidl nfsio 18267 195773 0 0 3 0x14200 bored sosplice 69817 136344 55884 0 2 0xc82 syz-executor 78871 43185 55884 0 3 0x2 biowait syz-executor 60926 37869 55884 0 3 0x2 biowait syz-executor 20519 226981 55884 0 2 0x2 syz-executor 43217 147520 55884 0 3 0x82 nanoslp syz-executor 54487 23581 55884 0 2 0xc82 syz-executor 57592 190326 55884 0 3 0x82 nanoslp syz-executor 66732 85996 55884 0 3 0x2 biowait syz-executor 55884 204428 59226 0 3 0x82 kqread syz-executor 59226 49972 19380 0 3 0x10008a sigsusp ksh 19380 245807 40387 0 3 0x98 kqread sshd-session 40387 142840 98658 0 3 0x92 kqread sshd-session 98658 234297 1 0 3 0x88 kqread sshd 91513 116348 10079 73 3 0x1100090 kqread syslogd 10079 380595 1 0 3 0x100082 sbwait syslogd 21928 221958 1 0 3 0x100080 kqread resolvd 20690 53609 88114 77 3 0x100092 kqread dhcpleased 38055 277434 88114 77 3 0x100092 kqread dhcpleased 88114 109115 1 0 3 0x80 kqread dhcpleased 90098 20584 0 0 3 0x14200 bored smr 22487 66196 0 0 2 0x14200 zerothread 72232 119699 0 0 3 0x14200 aiodoned aiodoned 8829 283189 0 0 3 0x14200 syncer update 38615 466364 0 0 3 0x14200 cleaner cleaner 71131 462173 0 0 3 0x14200 reaper reaper 61778 483981 0 0 3 0x14200 pgdaemon pagedaemon 95587 259482 0 0 3 0x14200 bored viomb 71123 82734 0 0 3 0x40014200 acpi0 acpi0 9211 389459 0 0 3 0x14200 bored softnet0 61253 66605 0 0 3 0x14200 smrbar systqmp 6903 83462 0 0 3 0x14200 bored systq 42068 98356 0 0 3 0x40014200 tmoslp softclock 70920 502951 0 0 3 0x40014200 idle0 1 306649 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10191 11113K 11267K 166960K 11633 0 pcb 17 14K 16K 166960K 160 0 rtable 219 16K 17K 166960K 454 0 pf 35 13K 14K 166960K 71 0 ifaddr 37 6K 7K 166960K 69 0 ifgroup 58 2K 2K 166960K 102 0 sysctl 3 1K 9K 166960K 7 0 counters 34 18K 18K 166960K 161 0 ioctlops 0 0K 4K 166960K 196 0 iov 0 0K 16K 166960K 152 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1399 88K 88K 166960K 1704 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 6 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 54 0 dirhash 15 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 14 49K 89K 166960K 500 0 sigio 0 0K 0K 166960K 4 0 proc 51 50K 100K 166960K 533 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 121 0 in_multi 67 5K 7K 166960K 130 0 ether_multi 1 0K 0K 166960K 9 0 mrt 1 0K 0K 166960K 3 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 91 413K 413K 166960K 91 0 exec 0 0K 1K 166960K 407 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 196 154K 175K 166960K 6335 0 UVM aobj 43 2K 2K 166960K 44 0 pinsyscall 34 68K 91K 166960K 1588 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 20 0 NDP 13 0K 2K 166960K 45 0 temp 44 8636K 8700K 166960K 23900 0 kqueue 13 20K 37K 166960K 117 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 68 0 65 1 0 1 1 0 8 0 rtentry 136 125 0 40 4 0 4 4 0 8 0 unpcb 144 252 0 237 1 0 1 1 0 8 0 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 736 189 0 185 7 6 1 7 0 8 0 arp 96 22 0 5 1 0 1 1 0 8 0 ipq 40 1 0 0 1 0 1 1 0 8 0 ipqe 40 1 0 0 1 0 1 1 0 8 0 inpcb 328 615 0 605 13 11 2 12 0 8 0 ip6q 72 2 0 0 1 0 1 1 0 8 0 ip6af 40 3 0 0 1 0 1 1 0 8 0 nd6 112 25 0 10 1 0 1 1 0 8 0 pkpcb 40 5 0 5 2 1 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1072 123 0 123 1 0 1 1 0 8 1 pppxif 1384 3 0 3 1 1 0 1 0 8 0 pfstitem 24 1 0 0 1 0 1 1 0 8 0 pfstkey 128 4 0 3 1 0 1 1 0 8 0 pfstate 384 4 0 3 1 0 1 1 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 515 0 139 30 2 28 30 0 8 0 art_table 40 518 0 139 5 0 5 5 0 8 0 art_node 32 125 0 49 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 2 1 1 0 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 51 0 41 1 0 1 1 0 8 0 shmpl 112 42 0 1 2 0 2 2 0 8 0 dirhash 1024 21 0 2 3 0 3 3 0 8 0 dino2pl 256 2282 0 788 95 0 95 95 0 8 0 ffsino 256 2282 0 788 95 0 95 95 0 8 0 nchpl 144 2992 0 1307 63 0 63 63 0 8 0 rtmask 32 5 0 5 1 1 0 1 0 8 0 vnodes 216 2550 0 0 142 0 142 142 0 8 0 namei 1024 9414 0 9412 2 1 1 2 0 8 0 kstatmem 264 58 0 32 2 0 2 2 0 8 0 scsiplug 72 3 0 3 1 1 0 1 0 8 0 scxspl 216 9785 0 9782 8 7 1 8 1 8 0 plimitpl 152 153 0 137 1 0 1 1 0 8 0 sigapl 424 814 0 754 8 0 8 8 0 8 0 knotepl 120 19269 0 19222 21 19 2 16 0 8 0 kqueuepl 184 168 0 159 2 1 1 2 0 8 0 pipepl 304 142 0 115 3 0 3 3 0 8 0 fdescpl 448 779 0 753 5 1 4 5 0 8 0 filepl 120 3862 0 3653 13 5 8 12 0 8 1 lockfpl 104 154 0 152 1 0 1 1 0 8 0 lockfspl 48 64 0 62 1 0 1 1 0 8 0 sessionpl 144 23 0 16 1 0 1 1 0 8 0 pgrppl 48 64 0 49 1 0 1 1 0 8 0 ucredpl 104 578 0 567 1 0 1 1 0 8 0 zombiepl 144 786 0 786 1 0 1 1 0 8 1 processpl 1152 814 0 754 5 0 5 5 0 8 0 procpl 664 1407 0 1339 7 0 7 7 0 8 0 sosppl 168 9 0 9 2 1 1 1 0 8 1 sockpl 552 960 0 931 12 9 3 12 0 8 0 mcl64k 65536 38 0 37 1 0 1 1 0 8 0 mcl16k 16384 5 0 5 1 1 0 1 0 8 0 mcl12k 12288 2 0 2 1 1 0 1 0 8 0 mcl8k 8192 10 0 10 1 1 0 1 0 8 0 mcl4k 4096 2995 0 2944 14 7 7 14 0 8 0 mcl2k 2048 759 0 757 3 2 1 3 0 8 0 mtagpl 96 7 0 6 2 1 1 1 0 8 0 mbufpl 256 8667 0 8506 16 3 13 16 0 8 0 bufpl 280 3237 0 127 223 0 223 223 0 8 0 anonpl 24 148250 0 145438 41 9 32 35 0 187 6 amapchunkpl 152 20920 0 20543 39 14 25 35 0 158 6 amappl16 200 2494 0 2466 5 1 4 5 0 8 0 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 4 0 4 1 1 0 1 0 8 0 amappl13 176 412 0 411 1 0 1 1 0 8 0 amappl12 168 1122 0 1089 2 0 2 2 0 8 0 amappl11 160 6 0 6 1 1 0 1 0 8 0 amappl10 152 45 0 35 1 0 1 1 0 8 0 amappl9 144 249 0 249 1 1 0 1 0 8 0 amappl8 136 26 0 25 1 0 1 1 0 8 0 amappl7 128 90 0 88 1 0 1 1 0 8 0 amappl6 120 268 0 256 1 0 1 1 0 8 0 amappl5 112 81 0 73 1 0 1 1 0 8 0 amappl4 104 390 0 369 1 0 1 1 0 8 0 amappl3 96 3353 0 3282 3 0 3 3 0 8 0 amappl2 88 902 0 836 2 0 2 2 0 8 0 amappl1 80 10598 0 10097 13 1 12 13 0 8 0 amappl 88 5567 0 5435 5 0 5 5 0 92 0 uvmvnodes 80 2550 0 0 53 0 53 53 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 7 0 7 1 1 0 1 0 8 0 dma128 128 255 0 255 1 1 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 19 0 18 1 0 1 1 0 8 0 aobjpl 72 44 0 1 1 0 1 1 0 8 0 uaddrrnd 24 779 0 753 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 779 0 753 1 0 1 1 0 8 0 vmmpekpl 168 7965 0 7930 2 0 2 2 0 8 0 vmmpepl 168 55981 0 54410 85 6 79 85 0 357 0 vmsppl 368 778 0 753 4 1 3 4 0 8 0 rwobjpl 40 20194 0 16832 35 0 35 35 0 8 0 pdppl 4096 1565 0 1506 97 30 67 79 0 8 8 pvpl 32 369277 0 361930 114 21 93 106 0 265 8 pmappl 216 778 0 753 2 0 2 2 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 381 0 58 11 0 11 11 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace uao_detach(fffffd806f7128b8) at uao_detach+0xb9 sys/uvm/uvm_aobj.c:824 shm_deallocate_segment(fffffd806bd27c48) at shm_deallocate_segment+0x43 sys/kern/sysv_shm.c:152 sys_shmat(ffff80003c94ad18,ffff80003c9636f0,ffff80003c963640) at sys_shmat+0x559 sys/kern/sysv_shm.c:281 syscall(ffff80003c9636f0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c9636f0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9518dd3c820, count: -5 ddb> machine ddbcpu 1 No such command ddb> trace uao_detach(fffffd806f7128b8) at uao_detach+0xb9 sys/uvm/uvm_aobj.c:824 shm_deallocate_segment(fffffd806bd27c48) at shm_deallocate_segment+0x43 sys/kern/sysv_shm.c:152 sys_shmat(ffff80003c94ad18,ffff80003c9636f0,ffff80003c963640) at sys_shmat+0x559 sys/kern/sysv_shm.c:281 syscall(ffff80003c9636f0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c9636f0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9518dd3c820, count: -5