panic: pool_do_get: shmpl free list modified: page 0xfffff0006cc9e000; item addr 0xfffff0006cc9e9a0; offset 0x40=0x6a5c2ab5 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *340728 87603 0 0 0x4000000 1K syz-executor 43179 91210 0 0 0 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b68fe) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff83b39530,a,ffff80003c3f5c08) at pool_do_get+0x5df pool_get(ffffffff83b39530,a) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff80003afb9ca8,ffff80003c3f5e60,0,ffff80003c3f5db0) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff80003afb9ca8,ffff80003c3f5e60,ffff80003c3f5db0) at sys_shmget+0x195 sys/kern/sysv_shm.c:503 syscall(ffff80003c3f5e60) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3f5e60) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xcfe964f030, count: 7 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: pool_do_get: shmpl free list modified: page 0xfffff0006cc9e000; item addr 0xfffff0006cc9e9a0; offset 0x40=0x6a5c2ab5 ddb{1}> show kasan No such command ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b68fe) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff83b39530,a,ffff80003c3f5c08) at pool_do_get+0x5df pool_get(ffffffff83b39530,a) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff80003afb9ca8,ffff80003c3f5e60,0,ffff80003c3f5db0) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff80003afb9ca8,ffff80003c3f5e60,ffff80003c3f5db0) at sys_shmget+0x195 sys/kern/sysv_shm.c:503 syscall(ffff80003c3f5e60) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3f5e60) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xcfe964f030, count: -8 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c3f5a30 rbx 0xffff80002999ee07 rdx 0xffff80000002a740 rcx 0xffff80003afb9ca8 rax 0xffff80002999dff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x77cacff535c193b2 r11 0x869442c4f244c798 r12 0xffff80002999ec08 r13 0 r14 0 r15 0x1 rip 0xffffffff81b74b85 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c3f5a20 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=340728 pid=87603 tcnt=2 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=0xffff80003afb8d18,0xffffffff83ad0c38 process=0xffff80003afcf510 user=0xffff80003c3f0000, vmspace=0xfffff0006ccbe5d8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 32752 462745 5127 0 3 0 0x80 nanoslp syz-executor 32752 96169 5127 0 3 0 0x4000080 sbwait syz-executor 32752 5486 5127 0 3 0 0x4000080 fsleep syz-executor 87603 372306 55574 0 2 0 0 syz-executor *87603 340728 55574 0 7 0 0x4000000 syz-executor 37903 109030 73847 0 2 0 0 syz-executor 37903 229395 73847 0 3 0 0x4000080 fsleep syz-executor 37903 69656 73847 0 3 0 0x4000080 fsleep syz-executor 70375 407556 42500 0 3 0 0x80 nanoslp syz-executor 70375 173797 42500 0 3 0 0x4000080 kqsel syz-executor 70375 244650 42500 0 3 0 0x4000080 fsleep syz-executor 91210 43179 99642 0 7 0 0 syz-executor 91210 272628 99642 0 3 0 0x4000080 ttyout syz-executor 91210 354895 99642 0 3 0 0x4000080 fsleep syz-executor 73847 523832 53374 0 3 0x2 0x80 nanoslp syz-executor 71636 393380 53374 0 3 0x2 0x80 nanoslp syz-executor 5127 364350 53374 0 3 0x2 0x80 nanoslp syz-executor 2404 390433 53374 0 3 0x2 0x80 nanoslp syz-executor 29470 502450 53374 0 3 0x2 0x80 wait syz-executor 99642 6939 53374 0 3 0x2 0x80 nanoslp syz-executor 55574 76698 53374 0 3 0x2 0x80 nanoslp syz-executor 42500 160140 53374 0 3 0x2 0x80 nanoslp syz-executor 53374 171713 20677 0 3 0x2 0x80 kqread syz-executor 20677 510028 42463 0 3 0x100002 0x88 sigsusp ksh 42463 201747 26451 0 3 0x10 0x88 kqread sshd-session 26451 502789 95145 0 3 0x12 0x80 kqread sshd-session 78956 192227 1 0 3 0x100003 0x80 ttyin getty 95145 84528 1 0 3 0 0x88 kqread sshd 74607 44682 75905 74 3 0x1100012 0x80 bpf pflogd 75905 467880 1 0 3 0 0x80 sbwait pflogd 75947 78983 96696 73 3 0x1100010 0x80 kqread syslogd 96696 185710 1 0 3 0x100002 0x80 sbwait syslogd 23783 354417 1 0 3 0x100000 0x80 kqread resolvd 38098 106115 46360 77 3 0x100012 0x80 kqread dhcpleased 22207 229305 46360 77 3 0x100012 0x80 kqread dhcpleased 46360 326895 1 0 3 0 0x80 kqread dhcpleased 35452 200733 0 0 3 0x14000 0x200 bored smr 40051 134450 0 0 3 0x14000 0x200 pgzero zerothread 39209 36777 0 0 3 0x14000 0x200 aiodoned aiodoned 65876 343929 0 0 3 0x14000 0x200 syncer update 81916 328712 0 0 3 0x14000 0x200 cleaner cleaner 51678 118072 0 0 3 0x14000 0x200 reaper reaper 4235 28482 0 0 3 0x14000 0x200 pgdaemon pagedaemon 86971 232516 0 0 3 0x14000 0x200 bored viomb 72820 36375 0 0 3 0x14000 0x40000200 acpi0 acpi0 51745 469159 0 0 3 0x14000 0x40000200 idle1 72826 465576 0 0 3 0x14000 0x200 bored softnet1 77307 263287 0 0 3 0x14000 0x200 bored softnet0 1117 332616 0 0 3 0x14000 0x200 bored systqmp 50151 455167 0 0 3 0x14000 0x200 bored systq 13261 109052 0 0 3 0x14000 0x200 tmoslp softclockmp 16187 462288 0 0 3 0x14000 0x40000200 tmoslp softclock 74065 233139 0 0 3 0x14000 0x40000200 idle0 1 81106 0 0 3 0x80002 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex shmpl r = 0 (0xffffffff83b39548) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487 #2 pool_get+0x124 sys/kern/subr_pool.c:585 #3 shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 #4 sys_shmget+0x195 sys/kern/sysv_shm.c:503 #5 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #6 Xsyscall+0x128 Process 87603 (syz-executor) thread 0xffff80003afb9ca8 (340728) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a22f00) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] #1 syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 #2 Xsyscall+0x128 exclusive mutex shmpl r = 0 (0xffffffff83b39548) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487 #2 pool_get+0x124 sys/kern/subr_pool.c:585 #3 shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 #4 sys_shmget+0x195 sys/kern/sysv_shm.c:503 #5 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #6 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11062 12090K 12348K 166960K 12642 0 pcb 17 14K 16K 166960K 158 0 rtable 242 8K 8K 166960K 391 0 pf 36 18K 25K 166960K 83 0 ifaddr 43 7K 8K 166960K 54 0 ifgroup 55 2K 2K 166960K 71 0 sysctl 4 1K 9K 166960K 8 0 counters 70 37K 37K 166960K 88 0 ioctlops 0 0K 4K 166960K 1527 0 iov 0 0K 16K 166960K 7 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1357 85K 86K 166960K 1580 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 7 0 VM map 2 1K 1K 166960K 2 0 sem 10 0K 0K 166960K 18 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 18 65K 93K 166960K 360 0 sigio 0 0K 0K 166960K 3 0 proc 71 115K 164K 166960K 572 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 17 0 in_multi 99 7K 7K 166960K 106 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 7 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 454 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 248 169K 181K 166960K 5074 0 UVM aobj 11 2K 2K 166960K 13 0 pinsyscall 43 86K 104K 166960K 1526 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 2 0K 0K 166960K 27 0 NDP 12 0K 2K 166960K 33 0 temp 41 9115K 9135K 166960K 8951 0 kqueue 14 22K 30K 166960K 57 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 51 0 48 1 0 1 1 0 8 0 rtentry 176 115 0 8 6 0 6 6 0 8 0 unpcb 144 161 0 142 1 0 1 1 0 8 0 syncache 336 6 0 6 1 0 1 1 0 8 1 tcpcb 736 81 0 75 4 0 4 4 0 8 3 arp 136 19 0 0 1 0 1 1 0 8 0 inpcb 328 358 0 346 7 0 7 7 0 8 6 nd6 152 25 0 2 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 7 0 7 1 0 1 1 0 8 1 pppxif 1576 1 0 1 1 0 1 1 0 8 1 pfstscr 40 3 0 3 1 0 1 1 0 8 1 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 1 0 0 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 pfanchor 1288 5 0 0 1 0 1 1 0 8 0 pfstitem 24 34 0 0 1 0 1 1 0 8 0 pfstkey 128 37 0 3 2 0 2 2 0 8 0 pfstate 448 36 0 2 4 0 4 4 0 8 0 pfrule 1360 23 0 18 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 465 0 27 29 0 29 29 0 8 0 art_table 40 466 0 27 5 0 5 5 0 8 0 art_node 32 115 0 18 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 2 1 0 1 1 0 8 0 semupl 112 4 0 4 1 0 1 1 0 8 1 semapl 72 16 0 8 1 0 1 1 0 8 0 shmpl 112 10 0 2 1 0 1 1 0 8 0 pool(0xffffffff83b39530:shmpl): page inconsistency: page 0xfffff0006cc9e000; 26 on list, 8 missing, 35 items per page dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1963 0 496 93 0 93 93 0 8 0 ffsino 296 1963 0 496 114 0 114 114 0 8 0 nchpl 144 2452 0 747 64 0 64 64 0 8 0 rtmask 32 2 0 2 1 0 1 1 0 8 1 vnodes 216 2205 0 0 123 0 123 123 0 8 0 namei 1024 7584 0 7584 2 0 2 2 0 8 2 percpumem 16 60 0 9 1 0 1 1 0 8 0 kstatmem 264 37 0 10 3 0 3 3 0 8 1 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 9431 0 9431 10 2 8 8 1 8 8 plimitpl 152 149 0 131 1 0 1 1 0 8 0 sigapl 424 680 0 632 7 0 7 7 0 8 1 knotepl 120 406 0 0 13 0 13 13 0 8 0 kqueuepl 224 99 0 87 2 0 2 2 0 8 1 pipepl 344 139 0 112 3 0 3 3 0 8 0 fdescpl 528 664 0 632 3 0 3 3 0 8 0 filepl 160 2920 0 2690 13 0 13 13 0 8 3 lockfpl 104 79 0 77 1 0 1 1 0 8 0 lockfspl 48 37 0 35 1 0 1 1 0 8 0 sessionpl 144 32 0 23 1 0 1 1 0 8 0 pgrppl 48 41 0 24 1 0 1 1 0 8 0 ucredpl 104 309 0 295 1 0 1 1 0 8 0 zombiepl 144 635 0 632 1 0 1 1 0 8 0 processpl 1232 680 0 632 5 0 5 5 0 8 0 procpl 664 1057 0 1000 6 0 6 6 0 8 0 sockpl 752 583 0 549 10 0 10 10 0 8 6 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 9 0 0 2 0 2 2 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 116 0 0 15 0 15 15 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 23 0 0 3 0 3 3 0 8 0 mextrefs 64 19 0 0 1 0 1 1 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 184 0 0 12 0 12 12 0 8 0 bufpl 272 3737 0 105 243 0 243 243 0 8 0 anonpl 32 7496 0 0 61 0 61 61 0 247 0 amapchunkpl 152 17540 0 16829 35 0 35 35 0 158 7 amappl16 200 2425 0 2378 18 7 11 15 0 8 8 amappl15 192 8 0 8 1 1 0 1 0 8 0 amappl14 184 433 0 431 1 0 1 1 0 8 0 amappl13 176 128 0 116 1 0 1 1 0 8 0 amappl12 168 912 0 881 2 0 2 2 0 8 0 amappl11 160 4 0 4 1 1 0 1 0 8 0 amappl10 152 62 0 48 1 0 1 1 0 8 0 amappl9 144 293 0 292 1 0 1 1 0 8 0 amappl8 136 100 0 97 1 0 1 1 0 8 0 amappl7 128 149 0 135 1 0 1 1 0 8 0 amappl6 120 153 0 151 1 0 1 1 0 8 0 amappl5 112 96 0 86 1 0 1 1 0 8 0 amappl4 104 299 0 279 1 0 1 1 0 8 0 amappl3 96 2963 0 2842 4 0 4 4 0 8 0 amappl2 88 553 0 490 2 0 2 2 0 8 0 amappl1 80 11354 0 10729 15 0 15 15 0 8 2 amappl 88 4306 0 4131 5 0 5 5 0 92 0 uvmvnodes 80 105 0 0 3 0 3 3 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 128 254 0 254 2 1 1 1 0 8 1 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 12 0 2 1 0 1 1 0 8 0 uaddrrnd 24 664 0 632 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 664 0 632 1 0 1 1 0 8 0 vmmpekpl 168 7301 0 7270 2 0 2 2 0 8 0 vmmpepl 168 50930 0 48910 95 0 95 95 0 357 7 vmsppl 488 663 0 632 5 0 5 5 0 8 1 rwobjpl 80 17389 0 16300 27 0 27 27 0 8 3 pdppl 4096 1335 0 1264 99 28 71 85 0 8 0 pvpl 32 13707 0 0 112 1 111 111 0 265 0 pmappl 256 663 0 632 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 521 0 31 14 0 14 14 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83950ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x77bee74e02a0, count: 8 ddb{0}> trace x86_ipi_db(ffffffff83950ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x77bee74e02a0, count: -7 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b68fe) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff83b39530,a,ffff80003c3f5c08) at pool_do_get+0x5df pool_get(ffffffff83b39530,a) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff80003afb9ca8,ffff80003c3f5e60,0,ffff80003c3f5db0) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff80003afb9ca8,ffff80003c3f5e60,ffff80003c3f5db0) at sys_shmget+0x195 sys/kern/sysv_shm.c:503 syscall(ffff80003c3f5e60) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3f5e60) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xcfe964f030, count: 7 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b68fe) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff83b39530,a,ffff80003c3f5c08) at pool_do_get+0x5df pool_get(ffffffff83b39530,a) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff80003afb9ca8,ffff80003c3f5e60,0,ffff80003c3f5db0) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff80003afb9ca8,ffff80003c3f5e60,ffff80003c3f5db0) at sys_shmget+0x195 sys/kern/sysv_shm.c:503 syscall(ffff80003c3f5e60) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3f5e60) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xcfe964f030, count: -8