panic: pool_do_get: shmpl free list modified: page 0xfffffd806cf23000; item addr 0xfffffd806cf23af0; offset 0x40=0x67a65e14 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *265328 20660 32767 0x10 0x4000000 1K syz-executor 113260 84422 32767 0x10 0x4000000 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff833a4737) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff838cfbb8,1,ffff80002a4dc408) at pool_do_get+0x5da pool_get(ffffffff838cfbb8,1) at pool_get+0x149 shmget_allocate_segment(ffff8000350b0028,ffff80002a4dc660,0,ffff80002a4dc5b0) at shmget_allocate_segment+0x1a7 sys_shmget(ffff8000350b0028,ffff80002a4dc660,ffff80002a4dc5b0) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80002a4dc660) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a4dc660) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb2413a47b0, 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 0xfffffd806cf23000; item addr 0xfffffd806cf23af0; offset 0x40=0x67a65e14 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff833a4737) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff838cfbb8,1,ffff80002a4dc408) at pool_do_get+0x5da pool_get(ffffffff838cfbb8,1) at pool_get+0x149 shmget_allocate_segment(ffff8000350b0028,ffff80002a4dc660,0,ffff80002a4dc5b0) at shmget_allocate_segment+0x1a7 sys_shmget(ffff8000350b0028,ffff80002a4dc660,ffff80002a4dc5b0) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80002a4dc660) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a4dc660) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb2413a47b0, count: -8 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a4dc240 rbx 0xffff800029aacdc7 rdx 0 rcx 0xffff8000350b0028 rax 0xffff800029aabff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x55c1e2095bcd7fcd r11 0x3e6a78aa16384606 r12 0xffff800029aacbc8 r13 0 r14 0 r15 0x1 rip 0xffffffff82b5c385 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a4dc230 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=265328 pid=20660 tcnt=3 stat=onproc flags process=10 proc=4000000 runpri=50, usrpri=50, slppri=16, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000350b16f0,0xffffffff838a3d58 process=0xffff80003c4ff010 user=0xffff80002a4d7000, vmspace=0xfffffd806bff4748 estcpu=8, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 20660 25887 57156 32767 2 0x10 syz-executor 20660 289505 57156 32767 3 0x4000090 fsleep syz-executor *20660 265328 57156 32767 7 0x4000010 syz-executor 80727 291534 29271 32767 2 0x10 syz-executor 80727 103496 29271 32767 3 0x4000090 pipewr syz-executor 26904 137191 72867 32767 2 0x10 syz-executor 26904 180081 72867 32767 3 0x4000090 fsleep syz-executor 84422 132831 53544 32767 2 0x10 syz-executor 84422 113260 53544 32767 7 0x4000010 syz-executor 6674 390222 91674 32767 2 0x10 syz-executor 6674 252819 91674 32767 3 0x4000090 fsleep syz-executor 3452 141384 67509 32767 2 0x10 syz-executor 91091 412968 5216 32767 2 0x10 syz-executor 61492 169731 26675 0 2 0x2 syz-executor 82067 143117 82043 0 3 0x82 sbwait sshd-session 83106 82283 0 0 3 0x14200 bored sosplice 53544 402153 37938 32767 2 0x10 syz-executor 5216 394828 93918 32767 3 0x90 nanoslp syz-executor 57156 198127 53698 32767 3 0x90 nanoslp syz-executor 91674 436019 67833 32767 2 0x10 syz-executor 67509 343794 77578 32767 3 0x90 nanoslp syz-executor 29271 71160 46097 32767 2 0x10 syz-executor 72867 355795 53604 32767 2 0x10 syz-executor 37938 501464 26675 0 3 0x82 wait syz-executor 77578 249053 26675 0 3 0x82 wait syz-executor 93918 95372 26675 0 3 0x82 wait syz-executor 46097 366586 26675 0 3 0x82 wait syz-executor 53604 215846 26675 0 3 0x82 wait syz-executor 53698 337539 26675 0 3 0x82 wait syz-executor 67833 376018 26675 0 3 0x82 wait syz-executor 26675 519553 17004 0 2 0x2 syz-executor 17004 162342 26212 0 3 0x10008a sigsusp ksh 26212 316041 30559 0 3 0x98 kqread sshd-session 30559 416217 82043 0 3 0x92 kqread sshd-session 24916 378029 1 0 3 0x100083 ttyin getty 82043 318013 1 0 3 0x88 kqread sshd 22701 329103 64964 73 3 0x1100090 kqread syslogd 64964 371390 1 0 3 0x100082 sbwait syslogd 44200 411608 1 0 3 0x100080 kqread resolvd 96977 262997 51744 77 3 0x100092 kqread dhcpleased 22919 54963 51744 77 3 0x100092 kqread dhcpleased 51744 145440 1 0 3 0x80 kqread dhcpleased 24544 332160 0 0 3 0x14200 bored smr 44814 229265 0 0 2 0x14200 zerothread 58713 233923 0 0 3 0x14200 aiodoned aiodoned 68773 189553 0 0 3 0x14200 syncer update 66429 207 0 0 3 0x14200 cleaner cleaner 82168 148277 0 0 3 0x14200 reaper reaper 47313 331939 0 0 3 0x14200 pgdaemon pagedaemon 53930 418407 0 0 3 0x14200 bored viomb 87027 51385 0 0 3 0x40014200 acpi0 acpi0 13235 459208 0 0 3 0x40014200 idle1 67751 334167 0 0 3 0x14200 bored softnet3 59827 307128 0 0 3 0x14200 bored softnet2 54251 281206 0 0 3 0x14200 bored softnet1 36782 137446 0 0 3 0x14200 bored softnet0 46873 250029 0 0 3 0x14200 bored systqmp 64915 83812 0 0 3 0x14200 bored systq 96881 251843 0 0 3 0x14200 tmoslp softclockmp 57870 510096 0 0 3 0x40014200 tmoslp softclock 18517 264879 0 0 3 0x40014200 idle0 1 458258 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex shmpl r = 0 (0xffffffff838cfbd0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 mtx_enter_try+0x178 #2 mtx_enter+0x60 sys/kern/kern_lock.c:239 #3 pool_get+0x10b sys/kern/subr_pool.c:583 #4 shmget_allocate_segment+0x1a7 #5 sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 #6 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 Process 20660 (syz-executor) thread 0xffff8000350b0028 (265328) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839b39d0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 syscall+0xae6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #1 syscall+0xae6 sys/arch/amd64/amd64/trap.c:577 #2 Xsyscall+0x128 exclusive mutex shmpl r = 0 (0xffffffff838cfbd0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 mtx_enter_try+0x178 #2 mtx_enter+0x60 sys/kern/kern_lock.c:239 #3 pool_get+0x10b sys/kern/subr_pool.c:583 #4 shmget_allocate_segment+0x1a7 #5 sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 #6 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 Process 84422 (syz-executor) thread 0xffff8000ffff9968 (113260) exclusive rwlock amaplk r = 0 (0xfffffd8068c38b68) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 uvm_fault_check+0x54c sys/uvm/uvm_fault.c:846 #3 uvm_fault+0x106 sys/uvm/uvm_fault.c:668 #4 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #5 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #6 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd806bff44b8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_read+0x3af sys/kern/kern_rwlock.c:405 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1864 #3 uvm_fault_check+0x4b sys/uvm/uvm_fault.c:732 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:668 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #6 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #7 recall_trap+0x8 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10186 10952K 10966K 166960K 11268 0 pcb 17 12K 12K 166960K 17 0 rtable 212 6K 6K 166960K 361 0 pf 29 16K 16K 166960K 31 0 ifaddr 38 6K 7K 166960K 44 0 ifgroup 46 2K 2K 166960K 50 0 sysctl 1 1K 1K 166960K 1 0 counters 62 36K 36K 166960K 64 0 ioctlops 0 0K 2K 166960K 34 0 iov 0 0K 16K 166960K 18 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1333 84K 84K 166960K 1537 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 7 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 21 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 24 89K 121K 166960K 488 0 sigio 0 0K 0K 166960K 1 0 proc 58 79K 115K 166960K 499 0 subproc 71 4K 4K 166960K 233 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 57 0 in_multi 88 6K 7K 166960K 114 0 ether_multi 1 0K 0K 166960K 2 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 452 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 232 65K 81K 166960K 5431 0 UVM aobj 10 2K 4K 166960K 12 0 pinsyscall 47 94K 108K 166960K 1493 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 15 0 NDP 10 0K 2K 166960K 27 0 temp 44 8636K 8700K 166960K 5274 0 kqueue 13 20K 26K 166960K 91 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 65 0 62 1 0 1 1 0 8 0 rtentry 112 113 0 14 4 0 4 4 0 8 0 unpcb 144 334 0 319 6 5 1 6 0 8 0 syncache 336 6 0 6 1 1 0 1 0 8 0 tcpcb 808 136 0 130 4 1 3 3 0 8 2 arp 120 18 0 2 1 0 1 1 0 8 0 ipq 40 3 0 1 1 0 1 1 0 8 0 ipqe 40 46 0 44 1 0 1 1 0 8 0 inpcb 376 441 0 432 13 3 10 12 0 8 8 nd6 136 26 0 5 1 0 1 1 0 8 0 kcovpl 48 25 0 18 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 457 0 48 29 1 28 29 0 8 0 art_table 32 458 0 48 4 0 4 4 0 8 0 art_node 16 112 0 22 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 3 1 0 1 1 0 8 0 semapl 112 18 0 8 1 0 1 1 0 8 0 shmpl 112 9 0 2 1 0 1 1 0 8 0 pool(0xffffffff838cfbb8:shmpl): page inconsistency: page 0xfffffd806cf23000; 27 on list, 7 missing, 35 items per page dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 1981 0 457 96 0 96 96 0 8 0 ffsino 280 1981 0 457 110 0 110 110 0 8 0 nchpl 144 2559 0 867 63 0 63 63 0 8 0 uvmvnodes 80 2223 0 0 46 0 46 46 0 8 0 vnodes 216 2223 0 0 124 0 124 124 0 8 0 namei 1024 8171 0 8171 1 0 1 1 0 8 1 percpumem 16 46 0 1 1 0 1 1 0 8 0 kstatmem 264 22 0 2 2 0 2 2 0 8 0 scxspl 216 8511 0 8511 10 3 7 8 1 8 7 plimitpl 152 111 0 88 3 1 2 2 0 8 1 sigapl 424 726 0 670 7 0 7 7 0 8 0 futexpl 64 3791 0 3788 1 0 1 1 0 8 0 knotepl 120 559 0 0 17 0 17 17 0 8 0 kqueuepl 216 109 0 100 1 0 1 1 0 8 0 pipepl 328 244 0 215 8 5 3 8 0 8 0 fdescpl 504 707 0 670 7 1 6 6 0 8 0 filepl 152 3557 0 3347 22 6 16 16 0 8 7 lockfpl 104 81 0 79 1 0 1 1 0 8 0 lockfspl 48 31 0 29 1 0 1 1 0 8 0 sessionpl 144 40 0 24 1 0 1 1 0 8 0 pgrppl 48 67 0 43 1 0 1 1 0 8 0 ucredpl 104 507 0 489 1 0 1 1 0 8 0 zombiepl 144 670 0 670 1 0 1 1 0 8 1 processpl 1168 726 0 670 5 0 5 5 0 8 0 procpl 648 1208 0 1146 7 1 6 7 0 8 0 sosppl 168 6 0 6 2 1 1 1 0 8 1 sockpl 688 842 0 815 25 14 11 16 0 8 8 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 106 0 0 14 0 14 14 0 8 0 mcl2k 2048 18 0 0 3 0 3 3 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 343 0 0 22 0 22 22 0 8 0 bufpl 280 2780 0 124 190 0 190 190 0 8 0 anonpl 24 139271 0 136001 48 8 40 46 0 184 12 amapchunkpl 152 17817 0 17304 28 3 25 28 0 158 4 amappl16 200 2815 0 2794 19 14 5 14 0 8 2 amappl15 192 5 0 4 1 0 1 1 0 8 0 amappl14 184 107 0 96 1 0 1 1 0 8 0 amappl13 176 6 0 6 1 1 0 1 0 8 0 amappl12 168 1309 0 1273 2 0 2 2 0 8 0 amappl11 160 71 0 61 1 0 1 1 0 8 0 amappl10 152 5 0 5 1 1 0 1 0 8 0 amappl9 144 281 0 281 1 1 0 1 0 8 0 amappl8 136 26 0 24 1 0 1 1 0 8 0 amappl7 128 106 0 95 1 0 1 1 0 8 0 amappl6 120 209 0 205 1 0 1 1 0 8 0 amappl5 112 115 0 109 1 0 1 1 0 8 0 amappl4 104 284 0 268 1 0 1 1 0 8 0 amappl3 96 3116 0 2994 4 0 4 4 0 8 0 amappl2 88 628 0 565 2 0 2 2 0 8 0 amappl1 80 8854 0 8228 15 0 15 15 0 8 0 amappl 88 5047 0 4868 5 0 5 5 0 92 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 11 0 2 1 0 1 1 0 8 0 uaddrrnd 24 707 0 670 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 707 0 670 1 0 1 1 0 8 0 vmmpekpl 168 7703 0 7658 3 0 3 3 0 8 0 vmmpepl 168 49603 0 47545 104 6 98 104 0 357 8 vmsppl 456 706 0 670 7 1 6 6 0 8 0 rwobjpl 64 18631 0 15473 52 1 51 51 0 8 0 pdppl 4096 1422 0 1340 126 44 82 96 0 8 0 pvpl 32 15982 0 0 129 0 129 129 0 265 0 pmappl 248 706 0 670 4 1 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 317 0 50 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837b0ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff839b37c8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff839b37c8) at __mp_lock+0x192 sys/kern/kern_lock.c:144 softintr_dispatch(0) at softintr_dispatch+0x5b sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff839b37c8) at __mp_lock+0x19e __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff839b37c8) at __mp_lock+0x19e sys/kern/kern_lock.c:144 doopenat(ffff8000ffff9968,ffffff9c,2000000000c0,37c8cf86,0,ffff80002a4d0e10) at doopenat+0x314 sys/kern/vfs_syscalls.c:1124 syscall(ffff80002a4d0ec0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a4d0ec0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x96518787a40, count: 5 ddb{0}> trace x86_ipi_db(ffffffff837b0ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff839b37c8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff839b37c8) at __mp_lock+0x192 sys/kern/kern_lock.c:144 softintr_dispatch(0) at softintr_dispatch+0x5b sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff839b37c8) at __mp_lock+0x19e __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff839b37c8) at __mp_lock+0x19e sys/kern/kern_lock.c:144 doopenat(ffff8000ffff9968,ffffff9c,2000000000c0,37c8cf86,0,ffff80002a4d0e10) at doopenat+0x314 sys/kern/vfs_syscalls.c:1124 syscall(ffff80002a4d0ec0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a4d0ec0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x96518787a40, count: -10 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:437 panic(ffffffff833a4737) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff838cfbb8,1,ffff80002a4dc408) at pool_do_get+0x5da pool_get(ffffffff838cfbb8,1) at pool_get+0x149 shmget_allocate_segment(ffff8000350b0028,ffff80002a4dc660,0,ffff80002a4dc5b0) at shmget_allocate_segment+0x1a7 sys_shmget(ffff8000350b0028,ffff80002a4dc660,ffff80002a4dc5b0) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80002a4dc660) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a4dc660) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb2413a47b0, count: 7 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff833a4737) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff838cfbb8,1,ffff80002a4dc408) at pool_do_get+0x5da pool_get(ffffffff838cfbb8,1) at pool_get+0x149 shmget_allocate_segment(ffff8000350b0028,ffff80002a4dc660,0,ffff80002a4dc5b0) at shmget_allocate_segment+0x1a7 sys_shmget(ffff8000350b0028,ffff80002a4dc660,ffff80002a4dc5b0) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80002a4dc660) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a4dc660) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb2413a47b0, count: -8