uvm_fault(0xfffffa006d181e70, 0x0, 0, 1) -> e kernel: page fault trap, code=0 Stopped at sys_shmat+0x39d: movq 0(%r14),%rdi TID PID UID PRFLAGS PFLAGS CPU COMMAND *240541 19358 0 0 0x4000000 0 syz-executor sys_shmat(ffff80002a7382c0,ffff80002b0d5ed0,ffff80002b0d5e20) at sys_shmat+0x39d sys/kern/sysv_shm.c:283 syscall(ffff80002b0d5ed0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002b0d5ed0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xec348594810, 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(0xfffffa006d181e70, 0x0, 0, 1) -> e ddb> show kasan No such command ddb> trace sys_shmat(ffff80002a7382c0,ffff80002b0d5ed0,ffff80002b0d5e20) at sys_shmat+0x39d sys/kern/sysv_shm.c:283 syscall(ffff80002b0d5ed0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002b0d5ed0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xec348594810, count: -3 ddb> show registers rdi 0 rsi 0 rbp 0xffff80002b0d5e00 rbx 0 rdx 0x1 rcx 0x1 rax 0xfffffa006896df00 r8 0x180 r9 0xfffffa0007ffd750 r10 0x53fd86ca46bd335a r11 0x316aad5d77447579 r12 0xffff80002a7382c0 r13 0xffff8000015f6000 r14 0 r15 0x3 rip 0xffffffff830dfabd sys_shmat+0x39d cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002b0d5d70 ss 0x10 sys_shmat+0x39d: movq 0(%r14),%rdi ddb> show proc PROC (syz-executor) tid=240541 pid=19358 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=75, usrpri=75, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a739780,0xffff80002a738d30 process=0xffff80002a89f1f8 user=0xffff80002b0d0000, vmspace=0xfffffa006d181e70 estcpu=25, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 56210 156593 70572 0 2 0 0 syz-executor 56210 318930 70572 0 2 0 0x4000000 syz-executor 19358 190332 81690 0 2 0 0 syz-executor 19358 111149 81690 0 3 0 0x4000080 fsleep syz-executor 19358 39984 81690 0 2 0 0x4000000 syz-executor *19358 240541 81690 0 7 0 0x4000000 syz-executor 95528 501587 55147 0 2 0 0 syz-executor 95528 10286 55147 0 3 0 0x4000080 fsleep syz-executor 40259 252223 72368 0 2 0 0 syz-executor 40259 289537 72368 0 3 0 0x4000080 kqsel syz-executor 40259 33090 72368 0 2 0 0x4000000 syz-executor 40259 466959 72368 0 2 0 0x4000000 syz-executor 25745 242557 14431 0 2 0 0 syz-executor 25745 411638 14431 0 3 0 0x4000080 fsleep syz-executor 51333 42500 81085 0 2 0 0 syz-executor 51333 402962 81085 0 2 0 0x4000000 syz-executor 51333 308141 81085 0 3 0 0x4000080 fsleep syz-executor 51333 35797 81085 0 2 0 0x4000000 syz-executor 49271 385579 43602 0 2 0x2 0 syz-executor 81085 113906 43602 0 3 0x2 0x80 nanoslp syz-executor 55147 481417 43602 0 3 0x2 0x80 nanoslp syz-executor 72368 453047 43602 0 3 0x2 0x80 nanoslp syz-executor 70572 44841 43602 0 3 0x2 0x80 nanoslp syz-executor 81690 344609 43602 0 3 0x2 0x80 nanoslp syz-executor 96680 496594 43602 0 3 0x2 0x80 wait syz-executor 14431 491626 43602 0 3 0x2 0x80 nanoslp syz-executor 43602 300377 62315 0 2 0x2 0 syz-executor 62315 158412 1277 0 3 0x100002 0x88 sigsusp ksh 1277 29442 5658 0 3 0x10 0x88 kqread sshd-session 5658 440792 40978 0 3 0x12 0x80 kqread sshd-session 60661 480935 1 0 3 0x100003 0x80 ttyin getty 40978 262342 1 0 3 0 0x88 kqread sshd 34049 208539 33331 73 3 0x1100010 0x80 kqread syslogd 33331 459508 1 0 3 0x100002 0x80 sbwait syslogd 16867 227969 1 0 3 0x100000 0x80 kqread resolvd 15288 171754 67486 77 3 0x100012 0x80 kqread dhcpleased 8126 250551 67486 77 3 0x100012 0x80 kqread dhcpleased 67486 241655 1 0 3 0 0x80 kqread dhcpleased 5061 99973 0 0 3 0x14000 0x200 bored smr 32722 162169 0 0 2 0x14000 0x200 zerothread 99955 38601 0 0 3 0x14000 0x200 aiodoned aiodoned 46362 440686 0 0 3 0x14000 0x200 syncer update 48671 282385 0 0 3 0x14000 0x200 cleaner cleaner 25518 477544 0 0 3 0x14000 0x200 reaper reaper 77244 47742 0 0 3 0x14000 0x200 pgdaemon pagedaemon 57555 399575 0 0 3 0x14000 0x200 bored viomb 79701 37110 0 0 3 0x14000 0x40000200 acpi0 acpi0 21865 445388 0 0 3 0x14000 0x200 bored softnet0 59680 19425 0 0 3 0x14000 0x200 bored systqmp 31626 367708 0 0 3 0x14000 0x200 bored systq 6734 147684 0 0 3 0x14000 0x40000200 tmoslp softclock 65378 95127 0 0 3 0x14000 0x40000200 idle0 1 357139 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11028 12103K 12119K 166960K 12224 0 pcb 17 14K 16K 166960K 110 0 rtable 215 5K 6K 166960K 775 0 pf 29 12K 13K 166960K 59 0 ifaddr 38 6K 7K 166960K 102 0 ifgroup 46 2K 2K 166960K 106 0 sysctl 1 1K 9K 166960K 5 0 counters 32 17K 17K 166960K 47 0 ioctlops 0 0K 4K 166960K 52 0 iov 0 0K 12K 166960K 3 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1289 81K 81K 166960K 1533 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 4 0K 0K 166960K 5 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 97K 166960K 421 0 sigio 0 0K 0K 166960K 70 0 proc 60 59K 124K 166960K 893 0 subproc 66 4K 4K 166960K 201 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 6 0 in_multi 88 5K 6K 166960K 257 0 ether_multi 1 0K 0K 166960K 2 0 mrt 0 0K 0K 166960K 9 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 49 228K 228K 166960K 49 0 exec 0 0K 2K 166960K 552 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 226 143K 159K 166960K 4820 0 UVM aobj 3 2K 6K 166960K 5 0 pinsyscall 38 76K 96K 166960K 1885 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 1 0 NDP 12 0K 2K 166960K 69 0 temp 35 9114K 9178K 166960K 6078 0 kqueue 13 20K 22K 166960K 31 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 70 0 67 1 0 1 1 0 8 0 rtentry 136 266 0 167 4 0 4 4 0 8 0 unpcb 144 94 0 79 2 0 2 2 0 8 1 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 736 23 0 19 1 0 1 1 0 8 0 arp 96 46 0 30 1 0 1 1 0 8 0 inpcb 328 338 0 327 10 6 4 7 0 8 3 nd6 112 67 0 46 1 0 1 1 0 8 0 kcovpl 48 22 0 15 1 0 1 1 0 8 0 pfstscr 40 1 0 0 1 0 1 1 0 8 0 pfstitem 24 2 0 0 1 0 1 1 0 8 0 pfstkey 128 2 0 0 1 0 1 1 0 8 0 pfstate 384 1 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1080 0 669 32 1 31 32 0 8 4 art_table 40 1081 0 669 6 0 6 6 0 8 1 art_node 32 266 0 176 1 0 1 1 0 8 0 sysvmsgpl 40 105 0 65 1 0 1 1 0 8 0 semapl 72 3 0 1 1 0 1 1 0 8 0 shmpl 120 1 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1728 0 231 94 0 94 94 0 8 0 ffsino 256 1728 0 231 94 0 94 94 0 8 0 nchpl 144 2039 0 281 66 0 66 66 0 8 0 vnodes 216 1952 0 0 109 0 109 109 0 8 0 namei 1024 8690 0 8689 5 3 2 4 0 8 1 vcpupl 3968 32 0 32 4 4 0 4 0 8 0 vmpool 808 2 0 2 1 1 0 1 0 8 0 kstatmem 264 51 0 30 2 0 2 2 0 8 0 scxspl 216 6774 0 6774 6 3 3 4 1 8 3 plimitpl 152 52 0 36 1 0 1 1 0 8 0 sigapl 424 686 0 644 7 1 6 6 0 8 1 knotepl 120 4835 0 4787 15 5 10 10 0 8 8 kqueuepl 184 222 0 208 4 0 4 4 0 8 3 pipepl 304 171 0 144 3 0 3 3 0 8 0 fdescpl 448 673 0 644 5 1 4 5 0 8 0 filepl 120 2758 0 2550 10 1 9 9 0 8 1 lockfpl 104 12 0 10 1 0 1 1 0 8 0 lockfspl 48 7 0 5 1 0 1 1 0 8 0 sessionpl 144 38 0 30 1 0 1 1 0 8 0 pgrppl 48 61 0 45 1 0 1 1 0 8 0 ucredpl 104 157 0 144 1 0 1 1 0 8 0 zombiepl 144 731 0 730 1 0 1 1 0 8 0 processpl 1160 686 0 644 5 1 4 4 0 8 0 procpl 664 872 0 818 7 1 6 6 0 8 1 sockpl 552 505 0 475 9 4 5 7 0 8 2 mcl8k 8192 4 0 4 1 1 0 1 0 8 0 mcl4k 4096 2549 0 2488 14 5 9 14 0 8 0 mcl2k 2048 422 0 422 4 1 3 3 0 8 3 mextrefs 64 121 0 121 2 1 1 1 0 8 1 mtagpl 96 4 0 4 1 1 0 1 0 8 0 mbufpl 256 6375 0 6173 18 0 18 18 0 8 1 bufpl 272 2420 0 102 155 0 155 155 0 8 0 anonpl 24 102791 0 99708 32 1 31 31 0 187 10 amapchunkpl 152 25498 0 24997 38 3 35 35 0 158 15 amappl16 200 1271 0 1254 6 3 3 4 0 8 2 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 575 0 574 1 0 1 1 0 8 0 amappl13 176 144 0 134 1 0 1 1 0 8 0 amappl12 168 966 0 938 2 0 2 2 0 8 0 amappl11 160 7 0 7 1 1 0 1 0 8 0 amappl10 152 58 0 48 1 0 1 1 0 8 0 amappl9 144 274 0 274 1 1 0 1 0 8 0 amappl8 136 152 0 151 1 0 1 1 0 8 0 amappl7 128 171 0 160 1 0 1 1 0 8 0 amappl6 120 298 0 297 1 0 1 1 0 8 0 amappl5 112 91 0 83 1 0 1 1 0 8 0 amappl4 104 304 0 289 1 0 1 1 0 8 0 amappl3 96 2395 0 2300 4 1 3 3 0 8 0 amappl2 88 743 0 672 2 0 2 2 0 8 0 amappl1 80 12123 0 11571 14 1 13 13 0 8 1 amappl 88 3892 0 3727 5 0 5 5 0 92 0 uvmvnodes 80 98 0 0 2 0 2 2 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 6 0 6 1 1 0 1 0 8 0 dma128 128 253 0 253 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 18 0 17 1 0 1 1 0 8 0 aobjpl 72 5 0 2 1 0 1 1 0 8 0 uaddrrnd 24 673 0 644 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 673 0 644 1 0 1 1 0 8 0 vmmpekpl 168 7127 0 7081 3 0 3 3 0 8 0 vmmpepl 168 51950 0 50178 86 5 81 81 0 357 3 vmsppl 368 672 0 644 4 1 3 4 0 8 0 rwobjpl 40 17526 0 16583 11 0 11 11 0 8 0 pdppl 4096 1356 0 1292 108 44 64 82 0 8 0 pvpl 32 278950 0 271015 90 3 87 87 0 265 19 pmappl 216 674 0 646 3 1 2 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 544 0 61 14 0 14 14 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace sys_shmat(ffff80002a7382c0,ffff80002b0d5ed0,ffff80002b0d5e20) at sys_shmat+0x39d sys/kern/sysv_shm.c:283 syscall(ffff80002b0d5ed0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002b0d5ed0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xec348594810, count: -3 ddb> machine ddbcpu 1 No such command ddb> trace sys_shmat(ffff80002a7382c0,ffff80002b0d5ed0,ffff80002b0d5e20) at sys_shmat+0x39d sys/kern/sysv_shm.c:283 syscall(ffff80002b0d5ed0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002b0d5ed0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xec348594810, count: -3