uvm_fault(0xffffffff838d00a8, 0xffff800001492000, 0, 2) -> e kernel: page fault trap, code=2 Stopped at sys_shmat+0xe0: movl $0xffffffffffffffff,0(%r14) TID PID UID PRFLAGS PFLAGS CPU COMMAND *209801 970 0 0 0x4000000 0 syz-executor sys_shmat(ffff80002a88bcb8,ffff80003c94d590,ffff80003c94d4e0) at sys_shmat+0xe0 sys/kern/sysv_shm.c:235 syscall(ffff80003c94d590) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c94d590) at syscall+0x962 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc806543f830, count: 12 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(0xffffffff838d00a8, 0xffff800001492000, 0, 2) -> e ddb> trace sys_shmat(ffff80002a88bcb8,ffff80003c94d590,ffff80003c94d4e0) at sys_shmat+0xe0 sys/kern/sysv_shm.c:235 syscall(ffff80003c94d590) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c94d590) at syscall+0x962 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc806543f830, count: -3 ddb> show registers rdi 0 rsi 0x3e92675a rbp 0xffff80003c94d4c0 rbx 0xffff80003c94d590 rdx 0 rcx 0xffff80003c94d38c rax 0xffff80002a88bcb8 r8 0xffffffff811ce2c0 uvm_map_inentry_sp r9 0 r10 0 r11 0x288383e930e34f9d r12 0xffff80002a88bcb8 r13 0xffff800001465000 r14 0xffff800001492000 r15 0x2d00 __ALIGN_SIZE+0x1d00 rip 0xffffffff818c9c40 sys_shmat+0xe0 cs 0x8 rflags 0x10216 __ALIGN_SIZE+0xf216 rsp 0xffff80003c94d430 ss 0x10 sys_shmat+0xe0: movl $0xffffffffffffffff,0(%r14) ddb> show proc PROC (syz-executor) tid=209801 pid=970 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=84, usrpri=84, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a88a030,0xffff80003c93ad28 process=0xffff8000ffff9698 user=0xffff80003c948000, vmspace=0xfffffd806c9b5b98 estcpu=34, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 88119 494679 64398 0 2 0 syz-executor 70135 203037 39591 0 2 0 syz-executor 70135 146390 39591 0 2 0x4000000 syz-executor 970 119060 66245 0 2 0 syz-executor 970 222749 66245 0 2 0x4000000 syz-executor * 970 209801 66245 0 7 0x4000000 syz-executor 98880 423308 16458 0 2 0 syz-executor 98880 431494 16458 0 2 0x4000000 syz-executor 61854 162626 58828 0 2 0 syz-executor 61854 150800 58828 0 2 0x4000000 syz-executor 50119 301198 6979 0 2 0xc80 syz-executor 50119 492684 6979 0 3 0x4000080 fsleep syz-executor 50119 219960 6979 0 3 0x4000080 fsleep syz-executor 50119 173073 6979 0 3 0x4000080 fsleep syz-executor 58828 333288 57324 0 3 0x82 nanoslp syz-executor 39331 434443 57324 0 3 0x82 wait syz-executor 39591 339126 57324 0 3 0x82 nanoslp syz-executor 61208 232334 57324 0 2 0x2 syz-executor 65509 398061 0 0 3 0x14280 nfsidl nfsio 40868 487613 0 0 3 0x14280 nfsidl nfsio 47198 419176 0 0 3 0x14280 nfsidl nfsio 55544 128226 0 0 3 0x14280 nfsidl nfsio 57223 119238 0 0 3 0x14280 nfsidl nfsio 25434 342279 0 0 3 0x14280 nfsidl nfsio 77712 221449 0 0 3 0x14280 nfsidl nfsio 56558 306281 0 0 3 0x14280 nfsidl nfsio 66925 182388 0 0 3 0x14280 nfsidl nfsio 41949 230700 0 0 3 0x14280 nfsidl nfsio 66480 426459 0 0 3 0x14280 nfsidl nfsio 9017 522099 0 0 3 0x14280 nfsidl nfsio 25459 71109 0 0 3 0x14280 nfsidl nfsio 3130 522152 0 0 3 0x14280 nfsidl nfsio 61415 133686 0 0 3 0x14280 nfsidl nfsio 2931 23130 0 0 3 0x14280 nfsidl nfsio 31951 306453 0 0 3 0x14280 nfsidl nfsio 29316 337610 0 0 3 0x14280 nfsidl nfsio 60935 10666 0 0 3 0x14280 nfsidl nfsio 23266 99477 0 0 3 0x14280 nfsidl nfsio 6979 142902 57324 0 3 0x82 nanoslp syz-executor 32888 405953 1 0 3 0x100083 ttyin getty 64398 235891 57324 0 2 0xc82 syz-executor 16458 2686 57324 0 3 0x82 nanoslp syz-executor 66245 475697 57324 0 3 0x82 nanoslp syz-executor 57324 339798 39493 0 3 0x82 kqread syz-executor 39493 234655 40880 0 3 0x10008a sigsusp ksh 40880 172390 550 0 3 0x98 kqread sshd-session 550 76857 95852 0 3 0x92 kqread sshd-session 95852 256330 1 0 3 0x88 kqread sshd 63501 411297 69576 73 3 0x1100090 kqread syslogd 69576 505154 1 0 3 0x100082 sbwait syslogd 36060 435353 1 0 3 0x100080 kqread resolvd 44165 256608 81819 77 3 0x100092 kqread dhcpleased 99815 132329 81819 77 3 0x100092 kqread dhcpleased 81819 168188 1 0 3 0x80 kqread dhcpleased 85923 289230 0 0 3 0x14200 bored smr 80964 16651 0 0 2 0x14200 zerothread 49419 13582 0 0 3 0x14200 aiodoned aiodoned 13546 309857 0 0 3 0x14200 syncer update 90995 247040 0 0 3 0x14200 cleaner cleaner 31443 381188 0 0 3 0x14200 reaper reaper 14868 227036 0 0 3 0x14200 pgdaemon pagedaemon 91326 246435 0 0 3 0x14200 bored viomb 37204 118687 0 0 3 0x40014200 acpi0 acpi0 31245 485573 0 0 3 0x14200 bored softnet0 65296 94221 0 0 3 0x14200 bored systqmp 43789 322178 0 0 3 0x14200 bored systq 29130 187092 0 0 3 0x40014200 tmoslp softclock 12200 45489 0 0 3 0x40014200 idle0 1 354829 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 10197 11062K 11669K 166960K 15787 0 pcb 18 15K 17K 166960K 574 0 rtable 238 12K 12K 166960K 752 0 pf 37 14K 17K 166960K 215 0 ifaddr 40 7K 8K 166960K 148 0 ifgroup 62 2K 2K 166960K 228 0 sysctl 4 1K 9K 166960K 27 0 counters 35 18K 18K 166960K 139 0 ioctlops 0 0K 4K 166960K 759 0 iov 0 0K 24K 166960K 250 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1428 90K 90K 166960K 3707 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 4 10K 10K 166960K 33 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 75 0 dirhash 9 1K 2K 166960K 30 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 89K 166960K 2340 0 sigio 0 0K 0K 166960K 27 0 proc 60 59K 100K 166960K 856 0 subproc 72 4K 4K 166960K 137 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 576 0 in_multi 80 6K 7K 166960K 266 0 ether_multi 1 0K 0K 166960K 33 0 mrt 0 0K 0K 166960K 17 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 127 572K 572K 166960K 127 0 exec 0 0K 1K 166960K 782 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 231 161K 168K 166960K 22731 0 UVM aobj 32 14K 14K 166960K 35 0 pinsyscall 38 76K 92K 166960K 3639 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 164 0 NDP 14 0K 2K 166960K 109 0 temp 78 8668K 8924K 166960K 64465 0 kqueue 14 20K 37K 166960K 391 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 120 263 0 260 3 2 1 3 0 8 0 rtentry 136 217 0 132 4 0 4 4 0 8 0 unpcb 144 1538 0 1521 12 10 2 6 0 8 1 syncache 336 11 0 11 3 2 1 1 0 8 1 tcpqe 32 5 0 5 3 2 1 1 0 8 1 tcpcb 736 1104 0 1100 18 11 7 7 0 8 6 arp 96 35 0 20 1 0 1 1 0 8 0 ipq 40 9 0 8 1 0 1 1 0 8 0 ipqe 40 11 0 10 1 0 1 1 0 8 0 inpcb 328 2636 0 2628 19 12 7 10 0 8 6 ip6q 72 12 0 10 1 0 1 1 0 8 0 ip6af 40 17 0 16 1 0 1 1 0 8 0 nd6 112 47 0 26 1 0 1 1 0 8 0 pkpcb 40 17 0 17 3 2 1 1 0 8 1 kcovpl 48 15 0 7 1 0 1 1 0 8 0 mppekey 1024 2 0 2 1 1 0 1 0 8 0 ppxss 1072 89 0 89 3 2 1 1 0 8 1 pppxif 1384 7 0 7 2 2 0 1 0 8 0 pftag 88 2 0 0 1 0 1 1 0 8 0 pfstitem 24 1 0 0 1 0 1 1 0 8 0 pfstkey 128 1 0 0 1 0 1 1 0 8 0 pfstate 384 1 0 0 1 0 1 1 0 8 0 pfrule 1344 1 0 1 1 1 0 1 0 8 0 rttmr 136 5 0 5 2 1 1 1 0 8 1 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 975 0 599 38 12 26 31 0 8 2 art_table 40 978 0 599 5 0 5 5 0 8 0 art_node 32 214 0 140 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 5 1 1 0 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 65 0 55 1 0 1 1 0 8 0 shmpl 112 26 0 2 1 0 1 1 0 8 0 dirhash 1024 29 0 22 3 1 2 3 0 8 0 dino2pl 256 5610 0 4101 95 0 95 95 0 8 0 ffsino 256 5610 0 4101 95 0 95 95 0 8 0 nchpl 144 8732 0 7024 64 0 64 64 0 8 0 rtmask 32 19 0 19 3 2 1 1 0 8 1 vnodes 216 4931 0 0 274 0 274 274 0 8 0 namei 1024 30952 0 30951 1 0 1 1 0 8 0 vcpupl 3904 5 0 0 1 0 1 1 0 8 0 vmpool 800 6 0 1 1 0 1 1 0 8 0 kstatmem 264 158 0 130 4 1 3 3 0 8 1 scsiplug 72 10 0 10 3 2 1 1 0 8 1 scxspl 216 28695 0 28695 22 14 8 8 1 8 8 plimitpl 152 952 0 936 1 0 1 1 0 8 0 sigapl 424 2649 0 2587 8 0 8 8 0 8 0 knotepl 120 99233 0 99186 31 21 10 16 0 8 7 kqueuepl 184 863 0 853 10 5 5 5 0 8 4 pipepl 304 437 0 410 13 10 3 8 0 8 0 fdescpl 448 2610 0 2581 5 1 4 5 0 8 0 filepl 120 18229 0 18014 19 7 12 13 0 8 3 lockfpl 104 1599 0 1597 3 1 2 2 0 8 1 lockfspl 48 658 0 656 1 0 1 1 0 8 0 sessionpl 144 36 0 28 1 0 1 1 0 8 0 pgrppl 48 93 0 77 1 0 1 1 0 8 0 ucredpl 104 3396 0 3385 1 0 1 1 0 8 0 zombiepl 144 3139 0 3138 2 1 1 1 0 8 0 processpl 1152 2649 0 2587 5 0 5 5 0 8 0 procpl 664 6027 0 5956 9 0 9 9 0 8 2 sosppl 176 19 0 19 3 2 1 1 0 8 1 sockpl 552 4522 0 4494 28 20 8 13 0 8 5 mcl64k 65536 363 0 363 5 3 2 2 0 8 2 mcl16k 16384 12 0 12 2 1 1 1 0 8 1 mcl12k 12288 2 0 2 2 1 1 1 0 8 1 mcl9k 9216 7 0 7 3 2 1 1 0 8 1 mcl8k 8192 58 0 58 3 2 1 1 0 8 1 mcl4k 4096 5619 0 5567 16 8 8 15 0 8 1 mcl2k2 2112 25 0 25 3 2 1 1 0 8 1 mcl2k 2048 3686 0 3681 6 4 2 5 0 8 0 mtagpl 96 70 0 43 1 0 1 1 0 8 0 mbufpl 256 29988 0 29595 99 46 53 92 0 8 8 bufpl 280 12190 0 5969 445 0 445 445 0 8 0 anonpl 24 366179 0 361595 116 56 60 70 0 187 26 amapchunkpl 152 78416 0 77881 54 19 35 36 0 158 10 amappl16 200 6067 0 6032 69 56 13 28 0 8 8 amappl15 192 113 0 113 1 1 0 1 0 8 0 amappl14 184 8 0 8 1 1 0 1 0 8 0 amappl13 176 493 0 492 1 0 1 1 0 8 0 amappl12 168 3009 0 2972 2 0 2 2 0 8 0 amappl11 160 20 0 20 1 1 0 1 0 8 0 amappl10 152 45 0 35 1 0 1 1 0 8 0 amappl9 144 258 0 257 2 1 1 1 0 8 0 amappl8 136 18 0 16 1 0 1 1 0 8 0 amappl7 128 103 0 102 1 0 1 1 0 8 0 amappl6 120 355 0 342 1 0 1 1 0 8 0 amappl5 112 73 0 65 1 0 1 1 0 8 0 amappl4 104 451 0 427 1 0 1 1 0 8 0 amappl3 96 13594 0 13514 3 0 3 3 0 8 0 amappl2 88 2758 0 2688 2 0 2 2 0 8 0 amappl1 80 20305 0 19772 13 0 13 13 0 8 0 amappl 88 21498 0 21339 5 0 5 5 0 92 0 uvmvnodes 80 165 0 0 4 0 4 4 0 8 0 dma8192 8192 1 0 1 1 0 1 1 0 8 1 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 3 0 2 1 0 1 1 0 8 0 dma256 256 7 0 7 2 1 1 1 0 8 1 dma128 128 254 0 254 2 1 1 1 0 8 1 dma64 64 7 0 7 2 1 1 1 0 8 1 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 20 0 19 1 0 1 1 0 8 0 aobjpl 72 34 0 3 1 0 1 1 0 8 0 uaddrrnd 24 2610 0 2581 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2610 0 2581 1 0 1 1 0 8 0 vmmpekpl 168 20961 0 20914 3 0 3 3 0 8 0 vmmpepl 168 166228 0 164446 118 26 92 102 0 357 10 vmsppl 368 2609 0 2581 4 1 3 4 0 8 0 rwobjpl 40 42085 0 41054 19 5 14 16 0 8 0 pdppl 4096 5238 0 5169 122 51 71 78 0 8 2 pvpl 32 1095961 0 1086130 221 84 137 151 0 265 45 pmappl 216 2615 0 2582 2 0 2 2 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 524 0 146 12 0 12 12 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace sys_shmat(ffff80002a88bcb8,ffff80003c94d590,ffff80003c94d4e0) at sys_shmat+0xe0 sys/kern/sysv_shm.c:235 syscall(ffff80003c94d590) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c94d590) at syscall+0x962 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc806543f830, count: -3 ddb> machine ddbcpu 1 No such command ddb> trace sys_shmat(ffff80002a88bcb8,ffff80003c94d590,ffff80003c94d4e0) at sys_shmat+0xe0 sys/kern/sysv_shm.c:235 syscall(ffff80003c94d590) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c94d590) at syscall+0x962 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc806543f830, count: -3