panic: pool_do_get: shmpl free list modified: page 0xfffffd80605ee000; item addr 0xfffffd80605ee6a0; offset 0x0=0x7fff00007fff != 0x815296faa130a8d5 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 245137 59983 32767 0x10 0 1 syz-executor *393853 44979 32767 0x10 0x4000000 0K syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff83011cd5) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff835c4140,1,ffff8000383fb1a8) at pool_do_get+0x59d pool_get(ffffffff835c4140,1) at pool_get+0x141 shmget_allocate_segment(ffff80003098a2b8,ffff8000383fb400,0,ffff8000383fb350) at shmget_allocate_segment+0x1a7 sys_shmget(ffff80003098a2b8,ffff8000383fb400,ffff8000383fb350) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:480 syscall(ffff8000383fb400) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff8000383fb400) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9f9969a9ab0, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: pool_do_get: shmpl free list modified: page 0xfffffd80605ee000; item addr 0xfffffd80605ee6a0; offset 0x0=0x7fff00007fff != 0x815296faa130a8d5 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff83011cd5) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff835c4140,1,ffff8000383fb1a8) at pool_do_get+0x59d pool_get(ffffffff835c4140,1) at pool_get+0x141 shmget_allocate_segment(ffff80003098a2b8,ffff8000383fb400,0,ffff8000383fb350) at shmget_allocate_segment+0x1a7 sys_shmget(ffff80003098a2b8,ffff8000383fb400,ffff8000383fb350) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:480 syscall(ffff8000383fb400) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff8000383fb400) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9f9969a9ab0, count: -8 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff8000383faff0 rbx 0xffffffff8343bdcf cpu_info_full_primary+0x2dcf rdx 0xffff80000159b800 rcx 0xffff80003098a2b8 rax 0xffffffff8343aff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x724aa1e783e32c7b r11 0xc0b8fe0099d4ab69 r12 0xffffffff8343bbd0 cpu_info_full_primary+0x2bd0 r13 0 r14 0 r15 0x1 rip 0xffffffff822b4aa5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000383fafe0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=393853 pid=44979 tcnt=2 stat=onproc flags process=10 proc=4000000 runpri=32, usrpri=84, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003098af60,0xffff80003098b990 process=0xffff80002d971238 user=0xffff8000383f6000, vmspace=0xfffffd806bcbdc08 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 59983 245137 68032 32767 7 0x10 syz-executor 59983 70991 68032 32767 2 0x4000010 syz-executor 52968 410804 9883 32767 2 0x10 syz-executor 63441 97110 54643 32767 2 0x10 syz-executor 63441 449355 54643 32767 3 0x4000090 sbwait syz-executor 38232 406916 33978 0 2 0x2 ndp 64937 226170 91207 32767 2 0x10 syz-executor 64937 395789 91207 32767 3 0x4000090 fsleep syz-executor 44979 351402 45440 32767 2 0x10 syz-executor *44979 393853 45440 32767 7 0x4000010 syz-executor 33978 237719 28462 0 3 0x10008a sigsusp sh 51713 10564 11530 32767 3 0x90 nanoslp syz-executor 51713 242735 11530 32767 3 0x4000090 ttyin syz-executor 45440 273479 37749 32767 3 0x90 nanoslp syz-executor 9883 470536 45812 32767 3 0x90 nanoslp syz-executor 45812 250788 43282 0 3 0x82 wait syz-executor 4778 303192 57857 32767 3 0x10 biowait syz-executor 11530 195208 1190 32767 3 0x90 nanoslp syz-executor 68032 115474 71025 32767 3 0x90 nanoslp syz-executor 91207 405113 60655 32767 3 0x90 nanoslp syz-executor 28462 96212 83121 0 3 0x80 wait syz-executor 83121 365809 43282 0 3 0x82 wait syz-executor 54643 478915 57145 32767 3 0x90 nanoslp syz-executor 37749 289514 43282 0 3 0x82 wait syz-executor 60655 68963 43282 0 3 0x82 wait syz-executor 71025 55782 43282 0 3 0x82 wait syz-executor 57857 189336 43282 0 3 0x82 wait syz-executor 1190 262881 43282 0 3 0x82 wait syz-executor 57145 136664 43282 0 3 0x82 wait syz-executor 92778 239327 0 0 3 0x14200 bored sosplice 17966 309438 6257 0 3 0x100082 sbwait arp 6257 63044 19637 0 3 0x10008a sigsusp sh 19637 519668 1 0 3 0x80 wait syz-executor 43282 308409 44420 0 3 0x82 kqread syz-executor 44420 458267 21000 0 3 0x10008a sigsusp ksh 21000 19958 78609 0 3 0x98 kqread sshd-session 78609 20507 20913 0 3 0x92 kqread sshd-session 39718 126866 1 0 3 0x100083 ttyin getty 20913 387337 1 0 3 0x88 kqread sshd 28647 344701 49281 73 3 0x1100010 biowait syslogd 49281 112955 1 0 3 0x100082 sbwait syslogd 74863 104290 1 0 3 0x100080 kqread resolvd 30230 92317 86545 77 3 0x100092 kqread dhcpleased 77044 457058 86545 77 3 0x100092 kqread dhcpleased 86545 501599 1 0 3 0x80 kqread dhcpleased 3392 515430 0 0 3 0x14200 bored smr 4514 516412 0 0 2 0x14200 zerothread 1556 336999 0 0 3 0x14200 aiodoned aiodoned 5564 472353 0 0 3 0x14200 syncer update 58658 396383 0 0 3 0x14200 cleaner cleaner 73978 45641 0 0 3 0x14200 reaper reaper 93203 180973 0 0 3 0x14200 pgdaemon pagedaemon 11289 377822 0 0 3 0x14200 bored viomb 80310 353844 0 0 3 0x40014200 acpi0 acpi0 26934 203729 0 0 3 0x40014200 idle1 87202 385035 0 0 3 0x14200 bored softnet3 14992 208454 0 0 3 0x14200 bored softnet2 95844 442470 0 0 3 0x14200 bored softnet1 48732 255193 0 0 3 0x14200 bored softnet0 96663 311846 0 0 3 0x14200 bored systqmp 77070 407070 0 0 3 0x14200 bored systq 65592 322418 0 0 3 0x14200 tmoslp softclockmp 28865 242975 0 0 3 0x40014200 tmoslp softclock 17 181656 0 0 3 0x40014200 idle0 1 294746 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 (0xffffffff835c4150) #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+0x103 sys/kern/subr_pool.c:579 #4 shmget_allocate_segment+0x1a7 #5 sys_shmget+0x1b2 sys/kern/sysv_shm.c:480 #6 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #6 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 Process 44979 (syz-executor) thread 0xffff80003098a2b8 (393853) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83582c48) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 syscall+0xad6 mi_syscall sys/sys/syscall_mi.h:179 [inline] #1 syscall+0xad6 sys/arch/amd64/amd64/trap.c:577 #2 Xsyscall+0x128 exclusive mutex shmpl r = 0 (0xffffffff835c4150) #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+0x103 sys/kern/subr_pool.c:579 #4 shmget_allocate_segment+0x1a7 #5 sys_shmget+0x1b2 sys/kern/sysv_shm.c:480 #6 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #6 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 Process 4778 (syz-executor) thread 0xffff8000365caa48 (303192) exclusive rrwlock inode r = 0 (0xfffffd805335de68) #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 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:169 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1230 #6 ffs_inode_alloc+0x283 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0x113 sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x102 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3099 #10 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #10 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd807b1511b8) #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 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3084 #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 Process 28647 (syslogd) thread 0xffff8000ffffd960 (344701) exclusive rrwlock inode r = 0 (0xfffffd806e3e4b40) #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 sys_fsync+0x152 sys/kern/vfs_syscalls.c:2926 #6 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #6 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10220 14124K 14131K 166960K 11732 0 pcb 17 12K 12K 166960K 17 0 rtable 232 6K 7K 166960K 4725 0 pf 31 16K 16K 166960K 325 0 ifaddr 42 9K 9K 166960K 623 0 ifgroup 50 2K 2K 166960K 632 0 sysctl 3 0K 4K 166960K 6 0 counters 64 36K 36K 166960K 352 0 ioctlops 0 0K 2K 166960K 188 0 iov 0 0K 22K 166960K 115 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1482 93K 93K 166960K 4469 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 37 0 VM map 2 1K 1K 166960K 2 0 sem 12 1K 1K 166960K 156 0 dirhash 15 2K 3K 166960K 159 0 ACPI 1690 195K 286K 166960K 12418 0 file desc 29 109K 169K 166960K 5657 0 sigio 0 0K 0K 166960K 45 0 proc 58 79K 176K 166960K 4672 0 subproc 117 7K 13K 166960K 2886 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 3 0K 0K 166960K 566 0 in_multi 100 7K 7K 166960K 1764 0 ether_multi 1 0K 0K 166960K 16 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 259 1155K 1155K 166960K 259 0 exec 0 0K 1K 166960K 2528 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 248 82K 147K 166960K 42000 0 UVM aobj 83 7K 7K 166960K 90 0 pinsyscall 52 104K 146K 166960K 10607 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 188 0 NDP 27 2K 2K 166960K 454 0 temp 79 6824K 6902K 166960K 37467 0 kqueue 13 20K 33K 166960K 653 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 120 578 0 574 4 3 1 3 0 8 0 rtentry 112 1681 0 1572 10 6 4 4 0 8 0 unpcb 144 2696 0 2671 20 19 1 8 0 8 0 syncache 336 97 0 97 10 10 0 1 0 8 0 tcpqe 32 33 0 33 8 8 0 1 0 8 0 tcpcb 808 1922 0 1895 30 26 4 10 0 8 0 arp 120 294 0 276 1 0 1 1 0 8 0 ipq 40 19 0 16 1 0 1 1 0 8 0 ipqe 40 247 0 244 1 0 1 1 0 8 0 inpcb 336 4118 0 4085 30 26 4 9 0 8 0 nd6 136 464 0 441 1 0 1 1 0 8 0 kcovpl 48 222 0 213 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 6801 0 6346 101 72 29 30 0 8 0 art_table 32 6802 0 6346 4 0 4 4 0 8 0 art_node 16 1680 0 1581 1 0 1 1 0 8 0 sysvmsgpl 40 45 0 40 2 1 1 1 0 8 0 semapl 112 152 0 142 1 0 1 1 0 8 0 shmpl 112 87 0 8 3 0 3 3 0 8 0 shmpl: pool(0xffffffff835c4140:shmpl): free list modified: page 0xfffffd80605ee000; item ordinal 0; addr 0xfffffd80605ee6a0 (p 0xfffffd80605ee000); offset 0x0=0x7fff00007fff shmpl: pool(0xffffffff835c4140:shmpl): page inconsistency: page 0xfffffd80605ee000; item ordinal 1; addr 0x9705428dae07ff8a dirhash 1024 116 0 96 3 0 3 3 0 8 0 dino2pl 256 6162 0 4257 122 2 120 120 0 8 0 ffsino 272 6162 0 4257 130 2 128 128 0 8 0 nchpl 144 10008 0 8059 73 0 73 73 0 8 0 uvmvnodes 80 8744 0 0 179 0 179 179 0 8 0 vnodes 216 8744 0 0 486 0 486 486 0 8 0 namei 1024 47062 0 47061 20 18 2 2 0 8 1 percpumem 16 190 0 144 1 0 1 1 0 8 0 kstatmem 264 310 0 288 2 0 2 2 0 8 0 scxspl 216 94125 0 94123 29 28 1 8 1 8 0 plimitpl 152 997 0 971 3 1 2 2 0 8 0 sigapl 424 5552 0 5492 14 5 9 9 0 8 0 futexpl 64 31413 0 31412 16 15 1 1 0 8 0 knotepl 120 653 0 0 18 0 18 18 0 8 0 kqueuepl 216 749 0 740 6 5 1 3 0 8 0 pipepl 320 969 0 939 7 2 5 5 0 8 1 fdescpl 496 5533 0 5492 17 9 8 8 0 8 1 filepl 152 24601 0 24330 28 13 15 17 0 8 0 lockfpl 104 561 0 559 1 0 1 1 0 8 0 lockfspl 48 195 0 193 1 0 1 1 0 8 0 sessionpl 144 215 0 198 2 1 1 2 0 8 0 pgrppl 48 462 0 437 1 0 1 1 0 8 0 ucredpl 104 4041 0 4023 1 0 1 1 0 8 0 zombiepl 144 5492 0 5492 1 0 1 1 0 8 1 processpl 1160 5552 0 5492 6 0 6 6 0 8 0 procpl 648 9606 0 9541 7 0 7 7 0 8 0 srpgc 96 18 0 18 6 6 0 1 0 8 0 sosppl 168 127 0 127 11 11 0 1 0 8 0 sockpl 664 7420 0 7358 44 36 8 20 0 8 0 mcl64k 65536 26 0 0 3 0 3 3 0 8 0 mcl16k 16384 17 0 0 3 0 3 3 0 8 0 mcl12k 12288 16 0 0 2 0 2 2 0 8 0 mcl9k 9216 8 0 0 1 0 1 1 0 8 0 mcl8k 8192 25 0 0 3 0 3 3 0 8 0 mcl4k 4096 23 0 0 3 1 2 3 0 8 0 mcl2k2 2112 6 0 0 1 0 1 1 0 8 0 mcl2k 2048 334 0 0 34 3 31 34 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 770 0 0 43 0 43 43 0 8 0 bufpl 280 13500 0 4726 628 1 627 628 0 8 0 anonpl 24 712383 0 708952 152 101 51 103 0 185 3 amapchunkpl 152 133390 0 132869 88 53 35 45 0 158 13 amappl16 200 11002 0 10993 112 110 2 27 0 8 1 amappl15 192 8 0 8 1 1 0 1 0 8 0 amappl14 184 526 0 513 1 0 1 1 0 8 0 amappl13 176 15 0 15 5 5 0 1 0 8 0 amappl12 168 8517 0 8477 4 1 3 3 0 8 0 amappl11 160 43 0 33 1 0 1 1 0 8 0 amappl10 152 15 0 15 2 2 0 1 0 8 0 amappl9 144 135 0 135 1 1 0 1 0 8 0 amappl8 136 78 0 77 1 0 1 1 0 8 0 amappl7 128 449 0 437 1 0 1 1 0 8 0 amappl6 120 1585 0 1581 1 0 1 1 0 8 0 amappl5 112 823 0 813 1 0 1 1 0 8 0 amappl4 104 908 0 890 1 0 1 1 0 8 0 amappl3 96 26822 0 26699 5 0 5 5 0 8 0 amappl2 88 3213 0 3146 4 1 3 3 0 8 0 amappl1 80 44759 0 44166 24 5 19 21 0 8 0 amappl 88 40243 0 40054 6 0 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 89 0 7 2 0 2 2 0 8 0 uaddrrnd 24 5533 0 5492 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 5533 0 5492 1 0 1 1 0 8 0 vmmpekpl 168 46920 0 46853 7 2 5 5 0 8 0 vmmpepl 168 342865 0 340787 175 75 100 138 0 357 1 vmsppl 440 5532 0 5492 10 3 7 7 0 8 0 rwobjpl 56 101326 0 91590 142 2 140 140 0 8 0 pdppl 4096 11073 0 10984 571 470 101 125 0 8 12 pvpl 32 50142 0 0 407 2 405 405 0 265 0 pmappl 248 5532 0 5492 6 2 4 4 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1110 0 632 15 0 15 15 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(ffffffff83011cd5) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff835c4140,1,ffff8000383fb1a8) at pool_do_get+0x59d pool_get(ffffffff835c4140,1) at pool_get+0x141 shmget_allocate_segment(ffff80003098a2b8,ffff8000383fb400,0,ffff8000383fb350) at shmget_allocate_segment+0x1a7 sys_shmget(ffff80003098a2b8,ffff8000383fb400,ffff8000383fb350) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:480 syscall(ffff8000383fb400) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff8000383fb400) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9f9969a9ab0, count: -8 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: 0x77f47048ff90, 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: 0x77f47048ff90, count: -3