panic: Caught invalid memory access at ffff800001d563c0 size 8 op 1 Stopped at db_enter+0x17: popq %rbp TID PID UID PRFLAGS PFLAGS CPU COMMAND 377614 29620 0 0 0 0 syz-executor *190191 49642 0 0 0x4000000 1K syz-executor db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff84636510) at panic+0x270 sys/kern/subr_prf.c:198 __asan_store8_noabort(ffff800001d563c0) at __asan_store8_noabort+0xe4 kasan_shadow_check sys/kern/subr_kasan.c:-1 [inline] __asan_store8_noabort(ffff800001d563c0) at __asan_store8_noabort+0xe4 sys/kern/subr_kasan.c:1099 shm_delete_mapping(ffff800001c4c9a0,ffff800001c4b008) at shm_delete_mapping+0x1f9 sys/kern/sysv_shm.c:183 syscall(ffff80003bb70cf0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bb70cf0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1fd5981b580, count: 9 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: Caught invalid memory access at ffff800001d563c0 size 8 op 1 ddb{1}> show kasan KASAN: invalid write of 8 bytes at 0xffff800001d563c0 from pc 0xffffffff81dc0ec9 KASAN: first bad byte at 0xffff800001d563c0 (+0); shadow 0xfd: pool use-after-free (or unallocated item) KASAN: 0xffff800001d563c0 is 64 bytes inside the 112-byte item [0xffff800001d56380..0xffff800001d563f0) in pool 'shmpl' KASAN: allocated at: #0 pool_get+0x770 sys/kern/subr_pool.c:733 #1 shmget_allocate_segment+0x23b sys/kern/sysv_shm.c:-1 #2 sys_shmget+0x260 sys/kern/sysv_shm.c:503 #3 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 #4 Xsyscall+0x128 KASAN: freed at: #0 pool_put+0x79 sys/kern/subr_pool.c:918 #1 shm_deallocate_segment+0x85 sys/kern/sysv_shm.c:159 #2 sys_shmctl+0x51e sys/kern/sysv_shm.c:366 #3 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 #4 Xsyscall+0x128 KASAN: pc: shm_delete_mapping+0x1f9 KASAN: call trace: #0 __asan_store8_noabort+0xc0 kasan_shadow_check sys/kern/subr_kasan.c:-1 [inline] #0 __asan_store8_noabort+0xc0 sys/kern/subr_kasan.c:1099 #1 shm_delete_mapping+0x1f9 sys/kern/sysv_shm.c:183 #2 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #2 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 #3 Xsyscall+0x128 KASAN: shadow of 0xffff800001d56280..0xffff800001d56500 (1 cell = 8 bytes): 0xffff800001d56280: fd fd fd fd 08 08 fd fd fd fd fd fd fd fd fd fd 0xffff800001d56300: fd fd 08 08 fd fd fd fd fd fd fd fd fd fd fd fd >0xffff800001d56380: 08 08 fd fd fd fd fd fd[fd]fd fd fd fd fd 08 08 0xffff800001d56400: 08 08 08 08 08 08 08 08 08 08 08 08 08 08 fd fd 0xffff800001d56480: fd fd fd fd fd fd fd fd fd fd 08 08 fd fd fd fd KASAN: legend: 00 valid; 01..07 partial; fb malloc redzone; fc malloc freed; fd pool freed; fe kmem; fa global; f1..f4/f8 stack/scope ddb{1}> trace db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff84636510) at panic+0x270 sys/kern/subr_prf.c:198 __asan_store8_noabort(ffff800001d563c0) at __asan_store8_noabort+0xe4 kasan_shadow_check sys/kern/subr_kasan.c:-1 [inline] __asan_store8_noabort(ffff800001d563c0) at __asan_store8_noabort+0xe4 sys/kern/subr_kasan.c:1099 shm_delete_mapping(ffff800001c4c9a0,ffff800001c4b008) at shm_delete_mapping+0x1f9 sys/kern/sysv_shm.c:183 syscall(ffff80003bb70cf0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bb70cf0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1fd5981b580, count: -6 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003bb709b0 rbx 0xffff80003bb70a20 rdx 0 rcx 0xffff800028fe3ff0 rax 0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xffff80003bb70798 r11 0xffffffff831c6730 x86_bus_space_io_read_1 r12 0xffffffff84636510 __rodata_start+0x9e510 r13 0xffff800028fe4c08 r14 0xffff800028fe4e07 r15 0x1 rip 0xffffffff82e89947 db_enter+0x17 cs 0x8 rflags 0x246 rsp 0xffff80003bb709b0 ss 0x10 db_enter+0x17: popq %rbp ddb{1}> show proc PROC (syz-executor) tid=190191 pid=49642 tcnt=5 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800031ae34e0,0xffff800031ae8a98 process=0xffff800031ae79e0 user=0xffff80003bb65000, vmspace=0xffff800001c4c9a0 estcpu=36, cpticks=20, pctcpu=0.0, user=0, sys=20, intr=0 ddb{1}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 29620 377614 32375 0 7 0 0 syz-executor 49642 110010 42145 0 2 0 0 syz-executor 49642 186317 42145 0 2 0 0x4000000 syz-executor 49642 142973 42145 0 2 0 0x4000000 syz-executor *49642 190191 42145 0 7 0 0x4000000 syz-executor 49642 135796 42145 0 2 0 0x4000000 syz-executor 63308 490735 74394 0 2 0x10 0 syz-executor 63308 294835 74394 0 3 0x10 0x4000080 fsleep syz-executor 45332 35092 28144 0 2 0 0 syz-executor 45332 255309 28144 0 3 0 0x4000080 fsleep syz-executor 88939 208640 27631 0 2 0x2 0 ifconfig 27631 451607 91094 0 3 0x100002 0x88 sigsusp sh 24958 159954 69158 0 2 0 0 syz-executor 24958 405621 69158 0 3 0 0x4000080 fsleep syz-executor 91094 323659 4411 0 3 0x2 0x80 wait syz-executor 58014 256503 1 0 3 0x100003 0x80 ttyin getty 95200 17438 4411 0 3 0x2 0x80 wait syz-executor 70567 415894 4411 0 3 0x2 0x80 wait syz-executor 42145 280720 4411 0 3 0x2 0x80 nanoslp syz-executor 74394 248788 4411 0 3 0x2 0x80 nanoslp syz-executor 32375 21801 4411 0 3 0x2 0x80 nanoslp syz-executor 69158 100993 4411 0 3 0x2 0x80 nanoslp syz-executor 28144 165375 4411 0 3 0x2 0x80 nanoslp syz-executor 4411 57035 1 0 3 0x2 0x80 kqread syz-executor 21907 367010 1 0 3 0x10000002 0x88 kqread sshd 66652 156925 43544 74 3 0x1100012 0x80 bpf pflogd 43544 111899 1 0 3 0 0x80 sbwait pflogd 4847 175978 27000 73 3 0x1100010 0x80 kqread syslogd 27000 170005 1 0 3 0x100002 0x80 sbwait syslogd 10337 346028 1 0 3 0x100000 0x80 kqread resolvd 89454 301493 65148 77 3 0x100012 0x80 kqread dhcpleased 53883 123606 65148 77 3 0x100012 0x80 kqread dhcpleased 65148 15648 1 0 3 0 0x80 kqread dhcpleased 46964 16622 0 0 3 0x14000 0x200 bored smr 23757 69541 0 0 2 0x14000 0x200 zerothread 16393 116754 0 0 3 0x14000 0x200 aiodoned aiodoned 64695 421260 0 0 3 0x14000 0x200 syncer update 13345 471641 0 0 3 0x14000 0x200 cleaner cleaner 71634 366968 0 0 3 0x14000 0x200 reaper reaper 21045 294295 0 0 3 0x14000 0x200 pgdaemon pagedaemon 72554 148360 0 0 3 0x14000 0x200 bored viomb 9846 112093 0 0 3 0x14000 0x40000200 acpi0 acpi0 49090 488742 0 0 3 0x14000 0x40000200 idle1 31000 379680 0 0 3 0x14000 0x200 bored softnet1 1493 69046 0 0 2 0x14000 0x200 softnet0 18623 437838 0 0 3 0x14000 0x200 bored systqmp 16648 378790 0 0 3 0x14000 0x200 bored systq 10506 442683 0 0 3 0x14000 0x200 tmoslp softclockmp 51725 384843 0 0 3 0x14000 0x40000200 tmoslp softclock 1827 271029 0 0 3 0x14000 0x40000200 idle0 1 54750 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{1}> show all locks Process 49642 (syz-executor) thread 0xffff800031ae3ca8 (190191) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11061 12290K 12457K 166960K 12424 0 pcb 17 24K 24K 166960K 43 0 rtable 173 9K 13K 166960K 383 0 pf 28 20K 24K 166960K 64 0 ifaddr 31 8K 12K 166960K 57 0 ifgroup 43 2K 2K 166960K 79 0 sysctl 4 1K 13K 166960K 9 0 counters 64 41K 43K 166960K 84 0 ioctlops 0 0K 4K 166960K 1521 0 iov 0 0K 8K 166960K 6 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1305 84K 84K 166960K 1631 0 UFS quota 1 36K 36K 166960K 1 0 UFS mount 5 44K 44K 166960K 5 0 shm 3 6K 10K 166960K 11 0 VM map 2 1K 1K 166960K 2 0 sem 8 0K 0K 166960K 10 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 292K 166960K 11964 0 file desc 19 69K 93K 166960K 344 0 sigio 0 0K 0K 166960K 3 0 proc 78 145K 176K 166960K 644 0 subproc 72 9K 9K 166960K 90 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 20K 20K 166960K 1 0 ip_moptions 0 0K 0K 166960K 3 0 in_multi 66 4K 7K 166960K 110 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 11 0 ISOFS mount 1 36K 36K 166960K 1 0 MSDOSFS mount 1 20K 20K 166960K 1 0 ttys 85 587K 587K 166960K 85 0 exec 0 0K 2K 166960K 441 0 fusefs mount 1 36K 36K 166960K 1 0 tdb 3 1K 1K 166960K 3 0 VM swap 14 124K 124K 166960K 15 0 UVM amap 215 221K 252K 166960K 4970 0 UVM aobj 13 4K 4K 166960K 14 0 pinsyscall 1063 1797K 1797K 166960K 1541 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 9 0K 1K 166960K 37 0 temp 36 9166K 9486K 166960K 4603 0 kqueue 12 36K 52K 166960K 58 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 28 0 0 1 0 1 1 0 8 0 rtpcb 120 35 0 32 1 0 1 1 0 8 0 rtentry 176 123 0 45 6 0 6 6 0 8 0 unpcb 144 176 0 159 1 0 1 1 0 8 0 syncache 336 4 0 4 2 2 0 1 0 8 0 tcpcb 736 23 0 19 1 0 1 1 0 8 0 arp 136 21 0 8 1 0 1 1 0 8 0 inpcb 328 162 0 153 2 0 2 2 0 8 1 nd6 152 27 0 12 1 0 1 1 0 8 0 kcovpl 48 10 0 2 1 0 1 1 0 8 0 ppxss 1192 3 0 3 1 0 1 1 0 8 1 pffrag 232 6 0 3 1 0 1 1 0 482 0 pffrnode 88 6 0 3 1 0 1 1 0 8 0 pffrent 40 9 0 6 1 0 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 29 0 3 1 0 1 1 0 8 0 pfstkey 128 29 0 3 1 0 1 1 0 8 0 pfstate 448 29 0 3 3 0 3 3 0 8 0 pfrule 1360 22 0 17 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 499 0 179 29 0 29 29 0 8 6 art_table 40 500 0 179 5 0 5 5 0 8 0 art_node 32 123 0 52 1 0 1 1 0 8 0 semapl 72 8 0 2 1 0 1 1 0 8 0 shmpl 112 11 0 1 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1993 0 518 93 0 93 93 0 8 0 ffsino 296 1993 0 518 114 0 114 114 0 8 0 nchpl 144 2445 0 733 64 0 64 64 0 8 0 vnodes 216 2202 0 0 123 0 123 123 0 8 0 namei 1024 8299 0 8299 2 1 1 1 0 8 1 percpumem 16 58 0 10 1 0 1 1 0 8 0 kstatmem 264 41 0 20 2 0 2 2 0 8 0 scxspl 216 8308 0 8308 11 3 8 8 1 8 8 plimitpl 152 83 0 68 1 0 1 1 0 8 0 sigapl 424 659 0 612 7 1 6 7 0 8 0 knotepl 120 142 0 0 5 0 5 5 0 8 0 kqueuepl 224 85 0 77 1 0 1 1 0 8 0 pipepl 344 161 0 134 3 0 3 3 0 8 0 fdescpl 528 643 0 613 3 0 3 3 0 8 0 filepl 160 3431 0 3211 15 2 13 15 0 8 2 lockfpl 104 107 0 104 1 0 1 1 0 8 0 lockfspl 48 49 0 46 1 0 1 1 0 8 0 sessionpl 144 39 0 30 1 0 1 1 0 8 0 pgrppl 48 50 0 33 1 0 1 1 0 8 0 ucredpl 104 602 0 587 1 0 1 1 0 8 0 zombiepl 144 615 0 612 1 0 1 1 0 8 0 processpl 1232 659 0 612 5 0 5 5 0 8 0 procpl 664 1010 0 956 6 0 6 6 0 8 0 sosppl 176 1 0 1 1 0 1 1 0 8 1 sockpl 752 381 0 352 4 0 4 4 0 8 0 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 110 0 0 14 0 14 14 0 8 0 mcl2k 2048 19 0 0 3 0 3 3 0 8 0 mextrefs 64 19 0 0 1 0 1 1 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 155 0 0 10 0 10 10 0 8 0 bufpl 272 2632 0 172 164 0 164 164 0 8 0 anonpl 32 5152 0 0 42 0 42 42 0 222 0 amapchunkpl 152 14724 0 14284 25 1 24 24 0 158 4 amappl16 200 2167 0 2140 5 3 2 5 0 8 0 amappl15 192 6 0 6 2 2 0 1 0 8 0 amappl14 184 444 0 443 1 0 1 1 0 8 0 amappl13 176 128 0 118 1 0 1 1 0 8 0 amappl12 168 900 0 873 2 0 2 2 0 8 0 amappl11 160 23 0 23 2 1 1 1 0 8 1 amappl10 152 68 0 53 1 0 1 1 0 8 0 amappl9 144 277 0 277 1 1 0 1 0 8 0 amappl8 136 119 0 116 1 0 1 1 0 8 0 amappl7 128 155 0 142 1 0 1 1 0 8 0 amappl6 120 167 0 165 1 0 1 1 0 8 0 amappl5 112 97 0 88 1 0 1 1 0 8 0 amappl4 104 328 0 305 1 0 1 1 0 8 0 amappl3 96 2785 0 2679 4 0 4 4 0 8 0 amappl2 88 564 0 510 2 0 2 2 0 8 0 amappl1 80 11650 0 11201 15 1 14 15 0 8 3 amappl 88 4185 0 4038 5 0 5 5 0 92 1 uvmvnodes 80 100 0 0 3 0 3 3 0 8 0 dma4096 4096 2 0 2 2 2 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 8 0 8 3 2 1 1 0 8 1 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 13 0 1 1 0 1 1 0 8 0 uaddrrnd 24 643 0 613 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 643 0 613 1 0 1 1 0 8 0 vmmpekpl 168 7529 0 7488 3 0 3 3 0 8 0 vmmpepl 168 50308 0 48657 87 0 87 87 0 357 7 vmsppl 488 642 0 613 5 1 4 5 0 8 0 rwobjpl 80 17481 0 16549 25 2 23 24 0 8 1 pdppl 4096 1295 0 1226 97 28 69 87 0 8 0 pvpl 32 11420 0 0 95 2 93 93 0 265 0 pmappl 256 642 0 613 3 0 3 3 0 8 0 extentpl 40 47 0 29 1 0 1 1 0 8 0 phpool 120 435 0 36 13 0 13 13 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x19: leave x86_ipi_db(ffffffff851c3ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412 x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff85435340) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85435340) at __mp_lock+0x272 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x215 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x7b sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff85435340) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85435340) at __mp_lock+0x272 sys/kern/kern_lock.c:173 end trace frame: 0x0, count: 7 ddb{0}> trace x86_ipi_db(ffffffff851c3ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412 x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff85435340) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85435340) at __mp_lock+0x272 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x215 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x7b sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff85435340) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85435340) at __mp_lock+0x272 sys/kern/kern_lock.c:173 end trace frame: 0x0, count: -8 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x17: popq %rbp db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff84636510) at panic+0x270 sys/kern/subr_prf.c:198 __asan_store8_noabort(ffff800001d563c0) at __asan_store8_noabort+0xe4 kasan_shadow_check sys/kern/subr_kasan.c:-1 [inline] __asan_store8_noabort(ffff800001d563c0) at __asan_store8_noabort+0xe4 sys/kern/subr_kasan.c:1099 shm_delete_mapping(ffff800001c4c9a0,ffff800001c4b008) at shm_delete_mapping+0x1f9 sys/kern/sysv_shm.c:183 syscall(ffff80003bb70cf0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bb70cf0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1fd5981b580, count: 9 ddb{1}> trace db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff84636510) at panic+0x270 sys/kern/subr_prf.c:198 __asan_store8_noabort(ffff800001d563c0) at __asan_store8_noabort+0xe4 kasan_shadow_check sys/kern/subr_kasan.c:-1 [inline] __asan_store8_noabort(ffff800001d563c0) at __asan_store8_noabort+0xe4 sys/kern/subr_kasan.c:1099 shm_delete_mapping(ffff800001c4c9a0,ffff800001c4b008) at shm_delete_mapping+0x1f9 sys/kern/sysv_shm.c:183 syscall(ffff80003bb70cf0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bb70cf0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1fd5981b580, count: -6 ddb{1}>