panic: pool_do_put: shmpl: double pool_put: 0xfffffd8060788a10 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 306988 66563 32767 0x10 0 1 syz-executor *445100 66563 32767 0x10 0x4000000 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff83075487) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_put(ffffffff83602668,fffffd8060788a10) at pool_do_put+0x1be sys/kern/subr_pool.c:841 pool_put(ffffffff83602668,fffffd8060788a10) at pool_put+0xb3 sys/kern/subr_pool.c:799 shm_delete_mapping(fffffd806c0d6dd8,ffff80000127c008) at shm_delete_mapping+0x1ac shm_deallocate_segment sys/kern/sysv_shm.c:153 [inline] shm_delete_mapping(fffffd806c0d6dd8,ffff80000127c008) at shm_delete_mapping+0x1ac sys/kern/sysv_shm.c:174 syscall(ffff80002a110c10) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff80002a110c10) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe89bf5a1c20, count: 8 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: pool_do_put: shmpl: double pool_put: 0xfffffd8060788a10 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff83075487) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_put(ffffffff83602668,fffffd8060788a10) at pool_do_put+0x1be sys/kern/subr_pool.c:841 pool_put(ffffffff83602668,fffffd8060788a10) at pool_put+0xb3 sys/kern/subr_pool.c:799 shm_delete_mapping(fffffd806c0d6dd8,ffff80000127c008) at shm_delete_mapping+0x1ac shm_deallocate_segment sys/kern/sysv_shm.c:153 [inline] shm_delete_mapping(fffffd806c0d6dd8,ffff80000127c008) at shm_delete_mapping+0x1ac sys/kern/sysv_shm.c:174 syscall(ffff80002a110c10) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff80002a110c10) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe89bf5a1c20, count: -7 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a110940 rbx 0xffffffff83440dbf cpu_info_full_primary+0x2dbf rdx 0 rcx 0xffff8000371cb468 rax 0xffffffff8343fff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xabbbe072440531f7 r11 0x31fb78a6679d77f2 r12 0xffffffff83440bc0 cpu_info_full_primary+0x2bc0 r13 0 r14 0 r15 0x1 rip 0xffffffff821fdf75 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a110930 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=445100 pid=66563 tcnt=4 stat=onproc flags process=10 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000371ca028,0xffff8000371cbc10 process=0xffff8000ffff8920 user=0xffff80002a10b000, vmspace=0xfffffd806c0d6dd8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 37243 298706 22644 32767 2 0x10 syz-executor 66563 306988 917 32767 7 0x10 syz-executor *66563 445100 917 32767 7 0x4000010 syz-executor 66563 174328 917 32767 3 0x4000090 fsleep syz-executor 66563 425921 917 32767 3 0x4000090 fsleep syz-executor 97008 434930 77516 32767 3 0x10 biowait syz-executor 77516 3728 33745 0 3 0x82 wait syz-executor 62583 77716 18239 32767 3 0x90 nanoslp syz-executor 62583 104925 18239 32767 3 0x4000090 lockf syz-executor 62583 116992 18239 32767 3 0x4000090 fsleep syz-executor 21746 496737 20975 32767 3 0x90 nanoslp syz-executor 21746 226405 20975 32767 3 0x4000090 ttyopn syz-executor 21746 148152 20975 32767 3 0x4000090 fsleep syz-executor 57003 187931 96006 32767 3 0x90 nanoslp syz-executor 57003 43693 96006 32767 3 0x4000090 netcon syz-executor 57003 142218 96006 32767 3 0x4000090 fsleep syz-executor 96006 289922 3809 32767 3 0x90 nanoslp syz-executor 20975 486761 47594 32767 3 0x90 nanoslp syz-executor 19147 175220 80889 32767 3 0x90 wait syz-executor 73813 54048 64393 32767 3 0x90 nanoslp syz-executor 3809 348583 33745 0 3 0x82 wait syz-executor 64393 241347 33745 0 3 0x82 wait syz-executor 18239 184320 56523 32767 3 0x90 nanoslp syz-executor 22644 268021 9190 32767 3 0x90 nanoslp syz-executor 917 184082 86314 32767 3 0x90 nanoslp syz-executor 9190 419605 33745 0 3 0x82 wait syz-executor 47594 127362 33745 0 3 0x82 wait syz-executor 56523 91615 33745 0 3 0x82 wait syz-executor 86314 226390 33745 0 3 0x82 wait syz-executor 80889 128401 33745 0 3 0x82 wait syz-executor 11047 367638 0 0 3 0x14200 bored sosplice 33745 254685 73910 0 3 0x82 kqread syz-executor 73910 148250 88004 0 3 0x10008a sigsusp ksh 88004 182505 24153 0 3 0x98 kqread sshd-session 24153 125631 3248 0 3 0x92 kqread sshd-session 98286 312224 1 0 3 0x100083 ttyin getty 3248 260347 1 0 3 0x88 kqread sshd 14529 509950 28042 73 3 0x1100090 kqread syslogd 28042 417471 1 0 3 0x100082 sbwait syslogd 62640 175583 1 0 3 0x100080 kqread resolvd 55011 344439 19858 77 3 0x100092 kqread dhcpleased 80596 322128 19858 77 3 0x100092 kqread dhcpleased 19858 92639 1 0 3 0x80 kqread dhcpleased 7309 269539 0 0 3 0x14200 bored smr 8230 241785 0 0 3 0x14200 pgzero zerothread 4614 419023 0 0 3 0x14200 aiodoned aiodoned 54376 420958 0 0 3 0x14200 syncer update 32502 275420 0 0 3 0x14200 cleaner cleaner 78295 5080 0 0 3 0x14200 reaper reaper 59665 209418 0 0 3 0x14200 pgdaemon pagedaemon 20978 510528 0 0 3 0x14200 bored viomb 43912 64418 0 0 3 0x40014200 acpi0 acpi0 97216 350121 0 0 3 0x40014200 idle1 31167 368449 0 0 3 0x14200 bored softnet3 86960 280249 0 0 3 0x14200 bored softnet2 25014 440960 0 0 3 0x14200 bored softnet1 62127 353066 0 0 3 0x14200 bored softnet0 71946 264375 0 0 3 0x14200 bored systqmp 16801 509707 0 0 3 0x14200 bored systq 22365 494256 0 0 3 0x14200 tmoslp softclockmp 77109 171795 0 0 3 0x40014200 tmoslp softclock 58671 120362 0 0 3 0x40014200 idle0 1 108865 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex shmpl r = 0 (0xffffffff83602678) #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_put+0x9f sys/kern/subr_pool.c:797 #4 shm_delete_mapping+0x1ac shm_deallocate_segment sys/kern/sysv_shm.c:153 [inline] #4 shm_delete_mapping+0x1ac sys/kern/sysv_shm.c:174 #5 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #5 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #6 Xsyscall+0x128 CPU 1: exclusive mutex &pr->ps_mtx r = 0 (0xffff8000ffff8a38) #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 single_thread_check+0x43 sys/kern/kern_sig.c:2093 #4 sleep_finish+0xfe sleep_signal_check sys/kern/kern_synch.c:459 [inline] #4 sleep_finish+0xfe sys/kern/kern_synch.c:388 #5 rwsleep+0xf2 sys/kern/kern_synch.c:300 #6 futex_wait+0x372 sys/kern/sys_futex.c:250 #7 sys_futex+0x149 sys/kern/sys_futex.c:101 #8 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:179 [inline] #8 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 Process 66563 (syz-executor) thread 0xffff8000371cb468 (445100) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83510928) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 __mp_acquire_count+0x58 #2 mi_switch+0x4b7 sys/kern/sched_bsd.c:441 #3 sleep_finish+0x21e sys/kern/kern_synch.c:416 #4 rw_enter+0x348 sys/kern/kern_rwlock.c:285 #5 vm_map_lock_ln+0x143 sys/uvm/uvm_map.c:5252 #6 uvm_unmap+0x81 sys/uvm/uvm_map.c:1792 #7 shm_delete_mapping+0xa0 sys/kern/sysv_shm.c:170 #8 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #8 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 exclusive mutex shmpl r = 0 (0xffffffff83602678) #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_put+0x9f sys/kern/subr_pool.c:797 #4 shm_delete_mapping+0x1ac shm_deallocate_segment sys/kern/sysv_shm.c:153 [inline] #4 shm_delete_mapping+0x1ac sys/kern/sysv_shm.c:174 #5 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #5 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #6 Xsyscall+0x128 Process 97008 (syz-executor) thread 0xffff8000371ca538 (434930) exclusive rrwlock inode r = 0 (0xfffffd806c615f88) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:564 #5 vget+0x2bd sys/kern/vfs_subr.c:673 #6 ufs_ihashget+0x192 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1201 #8 ufs_lookup+0x19f8 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 #11 namei+0x7aa sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1852 #13 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #13 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd80559351a8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:564 #5 vget+0x2bd sys/kern/vfs_subr.c:673 #6 cache_lookup+0x36e sys/kern/vfs_cache.c:222 #7 ufs_lookup+0x218 sys/ufs/ufs/ufs_lookup.c:160 #8 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #9 vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 #10 namei+0x7aa sys/kern/vfs_lookup.c:250 #11 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1852 #12 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #12 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #13 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10186 11047K 11059K 166960K 11423 0 pcb 17 12K 12K 166960K 17 0 rtable 236 6K 7K 166960K 1958 0 pf 31 16K 16K 166960K 138 0 ifaddr 42 8K 8K 166960K 259 0 ifgroup 50 2K 2K 166960K 263 0 sysctl 3 0K 1K 166960K 5 0 counters 64 36K 36K 166960K 170 0 ioctlops 0 0K 2K 166960K 95 0 iov 0 0K 12K 166960K 52 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1456 92K 92K 166960K 2484 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 20 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 55 0 dirhash 15 2K 3K 166960K 39 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 25 93K 157K 166960K 1708 0 sigio 0 0K 0K 166960K 22 0 proc 58 79K 176K 166960K 2015 0 subproc 104 6K 12K 166960K 949 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 235 0 in_multi 99 7K 7K 166960K 722 0 ether_multi 1 0K 0K 166960K 11 0 mrt 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 85 387K 387K 166960K 85 0 exec 0 0K 1K 166960K 1148 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 250 74K 130K 166960K 13795 0 UVM aobj 33 6K 6K 166960K 36 0 pinsyscall 46 92K 126K 166960K 4143 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 37 0 NDP 13 0K 2K 166960K 184 0 temp 62 6820K 6945K 166960K 13995 0 kqueue 14 22K 36K 166960K 169 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> 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 120 240 0 237 2 1 1 2 0 8 0 rtentry 112 693 0 582 8 4 4 4 0 8 0 unpcb 144 746 0 731 8 6 2 4 0 8 1 syncache 336 26 0 26 6 5 1 1 0 8 1 tcpqe 32 7 0 7 3 3 0 1 0 8 0 tcpcb 808 524 0 513 17 15 2 8 0 8 0 arp 120 123 0 105 1 0 1 1 0 8 0 ipq 40 4 0 1 2 1 1 1 0 8 0 ipqe 40 48 0 45 2 1 1 1 0 8 0 inpcb 336 1215 0 1197 16 13 3 7 0 8 0 ip6q 72 1 0 1 1 1 0 1 0 8 0 ip6af 40 2 0 2 1 1 0 1 0 8 0 nd6 136 189 0 164 2 1 1 1 0 8 0 kcovpl 48 73 0 65 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 2811 0 2350 53 23 30 30 0 8 1 art_table 32 2812 0 2350 6 2 4 4 0 8 0 art_node 16 692 0 591 1 0 1 1 0 8 0 sysvmsgpl 40 12 0 6 1 0 1 1 0 8 0 semapl 112 48 0 38 1 0 1 1 0 8 0 shmpl 112 33 0 3 1 0 1 1 0 8 0 pool(shmpl): free list modified: page 0xfffffd8060788000; item ordinal 0; addr 0xfffffd8060788a10 (p 0xfffffd8060788000); offset 0x1c=0xdeadbeee dirhash 1024 35 0 16 3 0 3 3 0 8 0 dino2pl 256 2878 0 1235 104 1 103 103 0 8 0 ffsino 272 2878 0 1235 111 1 110 110 0 8 0 nchpl 144 4097 0 2324 66 0 66 66 0 8 0 uvmvnodes 80 3836 0 0 79 0 79 79 0 8 0 vnodes 216 3836 0 0 214 0 214 214 0 8 0 namei 1024 17859 0 17859 12 10 2 2 0 8 2 percpumem 16 99 0 53 1 0 1 1 0 8 0 kstatmem 264 128 0 106 2 0 2 2 0 8 0 scxspl 216 32444 0 32443 15 11 4 8 1 8 3 plimitpl 152 292 0 268 2 0 2 2 0 8 0 sigapl 424 1872 0 1816 10 2 8 9 0 8 0 futexpl 64 10850 0 10845 8 7 1 1 0 8 0 knotepl 120 356 0 0 10 0 10 10 0 8 0 kqueuepl 216 268 0 257 4 3 1 3 0 8 0 pipepl 320 457 0 430 11 2 9 9 0 8 4 fdescpl 496 1853 0 1816 9 2 7 7 0 8 0 filepl 152 8762 0 8507 24 8 16 19 0 8 0 lockfpl 104 252 0 247 1 0 1 1 0 8 0 lockfspl 48 89 0 86 1 0 1 1 0 8 0 sessionpl 144 87 0 71 1 0 1 1 0 8 0 pgrppl 48 179 0 155 1 0 1 1 0 8 0 ucredpl 104 1770 0 1751 1 0 1 1 0 8 0 zombiepl 144 1818 0 1816 1 0 1 1 0 8 0 processpl 1160 1872 0 1816 9 3 6 6 0 8 1 procpl 648 3045 0 2980 11 4 7 7 0 8 0 sosppl 168 15 0 14 5 4 1 1 0 8 0 sockpl 664 2280 0 2244 27 22 5 15 0 8 0 mcl64k 65536 9 0 0 2 0 2 2 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 9 0 0 2 0 2 2 0 8 0 mcl4k 4096 155 0 0 19 0 19 19 0 8 0 mcl2k 2048 59 0 0 6 1 5 5 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 389 0 0 23 0 23 23 0 8 0 bufpl 280 8152 0 1259 493 0 493 493 0 8 0 anonpl 24 309795 0 306387 89 39 50 80 0 185 9 amapchunkpl 152 44059 0 43505 56 20 36 44 0 158 12 amappl16 200 5708 0 5692 41 27 14 14 0 8 9 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 237 0 227 1 0 1 1 0 8 0 amappl13 176 48 0 48 1 1 0 1 0 8 0 amappl12 168 3322 0 3286 7 4 3 3 0 8 1 amappl11 160 45 0 35 1 0 1 1 0 8 0 amappl10 152 3 0 3 1 1 0 1 0 8 0 amappl9 144 137 0 137 1 1 0 1 0 8 0 amappl8 136 20 0 17 1 0 1 1 0 8 0 amappl7 128 213 0 202 1 0 1 1 0 8 0 amappl6 120 681 0 680 1 0 1 1 0 8 0 amappl5 112 353 0 343 1 0 1 1 0 8 0 amappl4 104 497 0 482 1 0 1 1 0 8 0 amappl3 96 8293 0 8168 4 0 4 4 0 8 0 amappl2 88 1541 0 1479 2 0 2 2 0 8 0 amappl1 80 18559 0 18030 17 2 15 15 0 8 0 amappl 88 12930 0 12734 7 1 6 6 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 35 0 3 1 0 1 1 0 8 0 pool(aobjpl): free list modified: page 0xfffffd806f886000; item ordinal 0; addr 0xfffffd806f8860d8 (p 0xfffffd806f886000); offset 0xc=0xdead410f uaddrrnd 24 1853 0 1816 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1853 0 1816 1 0 1 1 0 8 0 vmmpekpl 168 16457 0 16383 5 0 5 5 0 8 0 vmmpepl 168 122611 0 120640 117 17 100 100 0 357 4 vmsppl 440 1852 0 1816 8 2 6 6 0 8 0 rwobjpl 56 41344 0 36646 70 1 69 69 0 8 0 pdppl 4096 3713 0 3632 261 176 85 113 0 8 4 pvpl 32 40578 0 0 328 1 327 327 0 265 0 pmappl 248 1852 0 1816 6 2 4 4 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 640 0 247 12 0 12 12 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff83075487) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_put(ffffffff83602668,fffffd8060788a10) at pool_do_put+0x1be sys/kern/subr_pool.c:841 pool_put(ffffffff83602668,fffffd8060788a10) at pool_put+0xb3 sys/kern/subr_pool.c:799 shm_delete_mapping(fffffd806c0d6dd8,ffff80000127c008) at shm_delete_mapping+0x1ac shm_deallocate_segment sys/kern/sysv_shm.c:153 [inline] shm_delete_mapping(fffffd806c0d6dd8,ffff80000127c008) at shm_delete_mapping+0x1ac sys/kern/sysv_shm.c:174 syscall(ffff80002a110c10) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff80002a110c10) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe89bf5a1c20, count: -7 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff800029b7bff0) 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 end of kernel end trace frame: 0x727a4b3bb1f0, count: 12 ddb{1}> trace x86_ipi_db(ffff800029b7bff0) 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 end of kernel end trace frame: 0x727a4b3bb1f0, count: -3