panic: pool_do_get: shmpl free list modified: page 0xfffffd806c85a000; item addr 0xfffffd806c85a4d0; offset 0x40=0x69e84272 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 42613 69704 32767 0x10 0x4000000 1 syz-executor 55677 82798 32767 0x10 0 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834427cd) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff839fd670,1,ffff80003c409088) at pool_do_get+0x5df pool_get(ffffffff839fd670,1) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff8000fffe7a10,ffff80003c4092e0,101,ffff80003c409230) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff8000fffe7a10,ffff80003c4092e0,ffff80003c409230) at sys_shmget+0x195 sys/kern/sysv_shm.c:484 syscall(ffff80003c4092e0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4092e0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x431e75cee70, 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 0xfffffd806c85a000; item addr 0xfffffd806c85a4d0; offset 0x40=0x69e84272 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834427cd) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff839fd670,1,ffff80003c409088) at pool_do_get+0x5df pool_get(ffffffff839fd670,1) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff8000fffe7a10,ffff80003c4092e0,101,ffff80003c409230) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff8000fffe7a10,ffff80003c4092e0,ffff80003c409230) at sys_shmget+0x195 sys/kern/sysv_shm.c:484 syscall(ffff80003c4092e0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4092e0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x431e75cee70, count: -8 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c408eb0 rbx 0xffff8000299aee07 rdx 0xffff8000015d38c0 rcx 0xffff8000fffe7a10 rax 0xffff8000299adff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x2d58d9446bfaf518 r11 0xbdf1cd28f5d2ffbf r12 0xffff8000299aec08 r13 0 r14 0 r15 0x1 rip 0xffffffff8269e745 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c408ea0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=42613 pid=69704 tcnt=3 stat=onproc flags process=10 proc=4000000 runpri=50, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffe7778,0xffff8000fffe62c8 process=0xffff80003c3de1d0 user=0xffff80003c404000, vmspace=0xfffffd806c9ddd78 estcpu=36, cpticks=35, pctcpu=0.0, user=0, sys=35, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 14566 290053 82798 32767 2 0x10 syz-executor 37626 430497 98151 32767 2 0x10 syz-executor 69704 45865 47471 32767 2 0x10 syz-executor *69704 42613 47471 32767 7 0x4000010 syz-executor 69704 383890 47471 32767 2 0x4000010 syz-executor 83186 508213 74621 32767 2 0x10 syz-executor 83186 89238 74621 32767 3 0x4000090 fsleep syz-executor 40219 82130 98171 32767 2 0x10 syz-executor 40219 300008 98171 32767 3 0x4000090 fsleep syz-executor 92056 480142 42126 32767 2 0xc90 syz-executor 92056 178164 42126 32767 3 0x4000090 msgwait syz-executor 92056 241533 42126 32767 3 0x4000090 sbwait syz-executor 7222 488559 93014 32767 4 0x82010 syz-executor 7222 130482 93014 32767 2 0x4082010 syz-executor 7222 153557 93014 32767 2 0x4082010 syz-executor 7222 284049 93014 32767 3 0x4002010 suspend syz-executor 74621 251103 6355 32767 2 0xc90 syz-executor 98151 73817 33253 32767 2 0xc90 syz-executor 47471 473852 69358 32767 2 0xc90 syz-executor 98171 382822 79908 32767 2 0xc90 syz-executor 93014 20312 48520 32767 2 0xc90 syz-executor 68847 35471 43556 32767 3 0x90 wait syz-executor 42126 341377 54604 32767 2 0xc90 syz-executor 82798 55677 43968 32767 7 0x10 syz-executor 6355 505740 27428 0 3 0x82 wait syz-executor 54604 204607 27428 0 3 0x82 wait syz-executor 33253 394722 27428 0 3 0x82 wait syz-executor 69358 148653 27428 0 3 0x82 wait syz-executor 79908 363332 27428 0 3 0x82 wait syz-executor 43968 164316 27428 0 3 0x82 wait syz-executor 43556 20318 27428 0 3 0x82 wait syz-executor 48520 66580 27428 0 3 0x82 wait syz-executor 27428 1463 21437 0 3 0x82 kqread syz-executor 21437 310857 49969 0 3 0x10008a sigsusp ksh 49969 482780 4402 0 3 0x98 kqread sshd-session 4402 242815 47131 0 3 0x92 kqread sshd-session 26528 148146 1 0 3 0x100083 ttyin getty 47131 392810 1 0 3 0x88 kqread sshd 48237 20416 52625 73 3 0x1100090 kqread syslogd 52625 475817 1 0 3 0x100082 sbwait syslogd 27486 504111 1 0 3 0x100080 kqread resolvd 14825 284158 65600 77 3 0x100092 kqread dhcpleased 49419 435667 65600 77 3 0x100092 kqread dhcpleased 65600 179072 1 0 3 0x80 kqread dhcpleased 90674 381902 0 0 3 0x14200 bored smr 65388 369926 0 0 2 0x14200 zerothread 46717 469471 0 0 3 0x14200 aiodoned aiodoned 29720 329377 0 0 3 0x14200 syncer update 75544 71057 0 0 3 0x14200 cleaner cleaner 7364 382997 0 0 3 0x14200 reaper reaper 99931 128800 0 0 3 0x14200 pgdaemon pagedaemon 5745 91715 0 0 3 0x14200 bored viomb 34519 5226 0 0 3 0x40014200 acpi0 acpi0 44144 12798 0 0 3 0x40014200 idle1 94451 449213 0 0 3 0x14200 bored softnet1 35621 131924 0 0 2 0x14200 softnet0 21215 482837 0 0 3 0x14200 bored systqmp 46878 325558 0 0 3 0x14200 bored systq 4480 398247 0 0 3 0x14200 tmoslp softclockmp 12389 470401 0 0 3 0x40014200 tmoslp softclock 6057 480219 0 0 3 0x40014200 idle0 1 145669 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive mutex /syzkaller/managers/setuid/kernel/sys/kern/kern_timeout.c:62 r = 0 (0xffffffff838fc510) #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 timeout_run+0x194 sys/kern/kern_timeout.c:702 #3 softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842 #4 softclock_thread_mp+0x86 #5 proc_trampoline+0x10 CPU 1: exclusive mutex shmpl r = 0 (0xffffffff839fd688) #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:484 #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 69704 (syz-executor) thread 0xffff8000fffe7a10 (42613) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839a7c00) #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 (0xffffffff839fd688) #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:484 #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 82798 (syz-executor) thread 0xffff8000fffef4d8 (55677) exclusive rrwlock inode r = 0 (0xfffffd8060119b30) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576 #5 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203 #8 ufs_lookup+0x1a36 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x98a sys/kern/vfs_lookup.c:567 #11 namei+0x7ca sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1887 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8060119318) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576 #5 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 cache_lookup+0x351 sys/kern/vfs_cache.c:222 #7 ufs_lookup+0x1e3 sys/ufs/ufs/ufs_lookup.c:160 #8 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #9 vfs_lookup+0x98a sys/kern/vfs_lookup.c:567 #10 namei+0x7ca sys/kern/vfs_lookup.c:250 #11 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1887 #12 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #13 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11087 12023K 12034K 166960K 12180 0 pcb 17 12K 12K 166960K 17 0 rtable 239 6K 7K 166960K 405 0 pf 31 16K 16K 166960K 31 0 ifaddr 42 7K 7K 166960K 44 0 ifgroup 50 2K 2K 166960K 50 0 sysctl 4 1K 9K 166960K 10 0 counters 70 37K 37K 166960K 70 0 ioctlops 0 0K 4K 166960K 40 0 iov 0 0K 16K 166960K 33 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1287 81K 81K 166960K 1453 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 14 0 VM map 2 1K 1K 166960K 2 0 sem 12 1K 1K 166960K 13 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 26 97K 113K 166960K 616 0 sigio 0 0K 0K 166960K 16 0 proc 58 99K 147K 166960K 578 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 160 0 in_multi 99 7K 7K 166960K 120 0 ether_multi 1 0K 0K 166960K 4 0 mrt 1 0K 0K 166960K 18 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 265 1182K 1182K 166960K 265 0 exec 0 0K 1K 166960K 422 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 238 143K 164K 166960K 7588 0 UVM aobj 23 2K 2K 166960K 24 0 pinsyscall 47 94K 110K 166960K 1760 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 26 0 NDP 11 0K 2K 166960K 27 0 temp 55 9083K 9151K 166960K 6153 0 kqueue 13 20K 31K 166960K 136 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 26 0 0 1 0 1 1 0 8 0 rtpcb 120 65 0 60 1 0 1 1 0 8 0 rtentry 176 116 0 5 6 0 6 6 0 8 0 unpcb 144 558 0 541 7 3 4 4 0 8 3 syncache 336 16 0 16 1 0 1 1 0 8 1 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 555 0 546 7 3 4 7 0 8 2 arp 136 18 0 0 1 0 1 1 0 8 0 ipq 40 4 0 0 1 0 1 1 0 8 0 ipqe 40 9 0 2 1 0 1 1 0 8 0 inpcb 328 970 0 957 10 5 5 10 0 8 3 ip6q 72 3 0 1 1 0 1 1 0 8 0 ip6af 40 5 0 2 1 0 1 1 0 8 0 nd6 152 29 0 4 2 1 1 2 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 477 0 23 30 1 29 30 0 8 0 art_table 40 478 0 23 5 0 5 5 0 8 0 art_node 32 116 0 15 1 0 1 1 0 8 0 sysvmsgpl 40 11 0 9 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 11 0 1 1 0 1 1 0 8 0 shmpl 112 21 0 1 1 0 1 1 0 8 0 pool(0xffffffff839fd670:shmpl): page inconsistency: page 0xfffffd806c85a000; 14 on list, 20 missing, 35 items per page dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 2296 0 831 92 0 92 92 0 8 0 ffsino 296 2296 0 831 114 0 114 114 0 8 0 nchpl 144 3190 0 1500 64 0 64 64 0 8 0 vnodes 216 2377 0 0 133 0 133 133 0 8 0 namei 1024 10348 0 10348 3 2 1 3 0 8 1 percpumem 16 50 0 0 1 0 1 1 0 8 0 kstatmem 264 25 0 0 2 0 2 2 0 8 0 scxspl 216 10179 0 10179 8 7 1 7 1 8 1 plimitpl 152 206 0 180 2 0 2 2 0 8 0 sigapl 424 922 0 868 7 0 7 7 0 8 0 knotepl 120 323 0 0 10 0 10 10 0 8 0 kqueuepl 224 262 0 253 5 2 3 5 0 8 2 pipepl 344 230 0 203 9 3 6 9 0 8 3 fdescpl 528 906 0 868 3 0 3 3 0 8 0 filepl 160 5551 0 5329 18 3 15 18 0 8 5 lockfpl 104 240 0 237 1 0 1 1 0 8 0 lockfspl 48 63 0 60 1 0 1 1 0 8 0 sessionpl 144 116 0 100 1 0 1 1 0 8 0 pgrppl 48 135 0 111 1 0 1 1 0 8 0 ucredpl 104 1143 0 1124 1 0 1 1 0 8 0 zombiepl 144 869 0 868 1 0 1 1 0 8 0 processpl 1232 922 0 868 5 0 5 5 0 8 0 procpl 664 1759 0 1696 8 1 7 7 0 8 0 sosppl 176 5 0 5 2 1 1 1 0 8 1 sockpl 752 1603 0 1568 15 4 11 14 0 8 7 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 119 0 0 15 0 15 15 0 8 0 mcl2k 2048 21 0 0 3 0 3 3 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 303 0 0 19 0 19 19 0 8 0 bufpl 280 3068 0 102 212 0 212 212 0 8 0 anonpl 32 11577 0 0 94 0 94 94 0 246 0 amapchunkpl 152 24300 0 23777 45 3 42 42 0 158 19 amappl16 200 4974 0 4947 33 18 15 25 0 8 9 amappl15 192 104 0 104 2 1 1 1 0 8 1 amappl14 184 411 0 410 1 0 1 1 0 8 0 amappl13 176 130 0 120 1 0 1 1 0 8 0 amappl12 168 1144 0 1109 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 144 266 0 266 1 1 0 1 0 8 0 amappl8 136 98 0 96 1 0 1 1 0 8 0 amappl7 128 154 0 142 1 0 1 1 0 8 0 amappl6 120 159 0 157 1 0 1 1 0 8 0 amappl5 112 107 0 99 1 0 1 1 0 8 0 amappl4 104 285 0 271 1 0 1 1 0 8 0 amappl3 96 4652 0 4527 5 1 4 4 0 8 0 amappl2 88 593 0 539 2 0 2 2 0 8 0 amappl1 80 13949 0 13367 16 0 16 16 0 8 1 amappl 88 6747 0 6571 5 0 5 5 0 92 0 uvmvnodes 80 111 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 128 253 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 23 0 1 1 0 1 1 0 8 0 uaddrrnd 24 906 0 868 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 906 0 868 1 0 1 1 0 8 0 vmmpekpl 168 10207 0 10175 3 0 3 3 0 8 0 vmmpepl 168 70086 0 68000 110 0 110 110 0 357 8 vmsppl 488 905 0 868 7 2 5 6 0 8 0 rwobjpl 80 24212 0 23234 30 0 30 30 0 8 3 pdppl 4096 1819 0 1736 125 42 83 91 0 8 0 pvpl 32 20087 0 0 162 0 162 162 0 265 0 pmappl 256 905 0 868 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 309 0 51 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83875ff0) 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+0x2c kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153 __mp_lock(ffffffff839a7400) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839a7400) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 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 __mp_lock(ffffffff839a7400) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839a7400) at __mp_lock+0x192 sys/kern/kern_lock.c:173 syscall(ffff8000303863a0) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff8000303863a0) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x715c5bed6170, count: 4 ddb{0}> trace x86_ipi_db(ffffffff83875ff0) 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+0x2c kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153 __mp_lock(ffffffff839a7400) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839a7400) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 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 __mp_lock(ffffffff839a7400) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839a7400) at __mp_lock+0x192 sys/kern/kern_lock.c:173 syscall(ffff8000303863a0) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff8000303863a0) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x715c5bed6170, count: -11 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(ffffffff834427cd) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff839fd670,1,ffff80003c409088) at pool_do_get+0x5df pool_get(ffffffff839fd670,1) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff8000fffe7a10,ffff80003c4092e0,101,ffff80003c409230) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff8000fffe7a10,ffff80003c4092e0,ffff80003c409230) at sys_shmget+0x195 sys/kern/sysv_shm.c:484 syscall(ffff80003c4092e0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4092e0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x431e75cee70, count: 7 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834427cd) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff839fd670,1,ffff80003c409088) at pool_do_get+0x5df pool_get(ffffffff839fd670,1) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff8000fffe7a10,ffff80003c4092e0,101,ffff80003c409230) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff8000fffe7a10,ffff80003c4092e0,ffff80003c409230) at sys_shmget+0x195 sys/kern/sysv_shm.c:484 syscall(ffff80003c4092e0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4092e0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x431e75cee70, count: -8