uvm_fault(0xfffffd806ba631e8, 0x8, 0, 1) -> e kernel: page fault trap, code=0 Stopped at witness_checkorder+0x1ec: movl 0x8(%r14),%ebx TID PID UID PRFLAGS PFLAGS CPU COMMAND 376123 79756 0 0x14000 0x200 1 reaper witness_checkorder(fffffd806f301370,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f301360) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff80002121b010,fffffd806f301360,fffffd806f3013e8,4,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002121b010,4) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002121b010) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002121b010,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff80002121b010,ffff80002e40af10,ffff80002e40af60) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002e40afe0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002e40afe0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x776b5b845c90, count: 6 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: uvm_fault(0xfffffd806ba631e8, 0x8, 0, 1) -> e ddb{0}> trace witness_checkorder(fffffd806f301370,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f301360) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff80002121b010,fffffd806f301360,fffffd806f3013e8,4,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002121b010,4) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002121b010) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002121b010,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff80002121b010,ffff80002e40af10,ffff80002e40af60) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002e40afe0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002e40afe0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x776b5b845c90, count: -9 ddb{0}> show registers rdi 0 rsi 0x20000 acpi_pdirpa+0xbe63 rbp 0xffff80002e40acb0 rbx 0xe rdx 0 rcx 0xffff80002121b010 rax 0xffffffff82bbdff0 cpu_info_full_primary+0x1ff0 r8 0x1 r9 0 r10 0x4f7a62811895f96c r11 0xcc121f685a4b631a r12 0 r13 0xfffffd806f301370 r14 0 r15 0xffff80002121b010 rip 0xffffffff81a26f5c witness_checkorder+0x1ec cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002e40ac00 ss 0x10 witness_checkorder+0x1ec: movl 0x8(%r14),%ebx ddb{0}> show proc PROC (syz-executor.2) pid=506179 stat=onproc flags process=1018 proc=2000 pri=0, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000212b6550,0xffff80002121bd68 process=0xffff800026134ca8 user=0xffff80002e406000, vmspace=0xfffffd806ba631e8 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 85692 136206 79159 32767 2 0x10 syz-executor.0 85692 139978 79159 32767 3 0x4000090 fsleep syz-executor.0 85692 160359 79159 32767 2 0x4000010 syz-executor.0 85692 204948 79159 32767 2 0x4000010 syz-executor.0 85692 522610 79159 32767 2 0x4000010 syz-executor.0 21156 519995 26129 32767 2 0x10 syz-executor.5 21156 281144 26129 32767 2 0x4000010 syz-executor.5 21156 310644 26129 32767 3 0x4000090 fsleep syz-executor.5 5372 405740 44952 32767 2 0x10 syz-executor.7 5372 82941 44952 32767 3 0x4000090 fsleep syz-executor.7 5372 452441 44952 32767 3 0x4000090 fsleep syz-executor.7 10513 235070 37501 32767 2 0x490 syz-executor.1 37501 58021 66682 0 3 0x82 wait syz-executor.1 79159 338098 53892 32767 3 0x90 nanoslp syz-executor.0 53892 392822 66682 0 3 0x82 wait syz-executor.0 26129 309922 75577 32767 2 0x490 syz-executor.5 75577 13475 66682 0 3 0x82 wait syz-executor.5 2186 492675 68844 32767 2 0x10 syz-executor.3 68844 247028 66682 0 3 0x82 wait syz-executor.3 37796 267415 72522 32767 2 0x490 syz-executor.6 72522 487532 66682 0 3 0x82 wait syz-executor.6 77939 129789 72669 32767 2 0x490 syz-executor.2 72669 312829 66682 0 3 0x82 wait syz-executor.2 44952 71560 63369 32767 3 0x90 nanoslp syz-executor.7 63369 326863 66682 0 3 0x82 wait syz-executor.7 1204 60260 80783 32767 2 0x10 syz-executor.4 80783 28794 66682 0 3 0x82 wait syz-executor.4 5400 337954 0 0 3 0x14200 bored sosplice 66682 467124 25248 0 3 0x2000082 kqread syz-fuzzer 66682 491390 25248 0 3 0x6000082 nanoslp syz-fuzzer 66682 181516 25248 0 3 0x6000082 thrsleep syz-fuzzer 66682 207316 25248 0 3 0x6000082 wait syz-fuzzer 66682 227943 25248 0 3 0x6000082 thrsleep syz-fuzzer 66682 19158 25248 0 3 0x6000082 wait syz-fuzzer 66682 87191 25248 0 3 0x6000082 wait syz-fuzzer 66682 47696 25248 0 3 0x6000082 wait syz-fuzzer 66682 293711 25248 0 3 0x6000082 wait syz-fuzzer 66682 521885 25248 0 3 0x6000082 thrsleep syz-fuzzer 66682 439624 25248 0 3 0x6000082 thrsleep syz-fuzzer 66682 396302 25248 0 3 0x6000082 wait syz-fuzzer 66682 135755 25248 0 3 0x6000082 thrsleep syz-fuzzer 66682 471461 25248 0 3 0x6000082 wait syz-fuzzer 66682 306220 25248 0 3 0x6000082 wait syz-fuzzer 66682 338435 25248 0 3 0x6000082 thrsleep syz-fuzzer 25248 480885 51473 0 3 0x10008a sigsusp ksh 51473 232724 17017 0 3 0x9a kqread sshd 27006 81563 1 0 3 0x100083 ttyin getty 17017 21803 1 0 3 0x88 kqread sshd 27792 53542 79113 73 3 0x1100090 kqread syslogd 79113 106859 1 0 3 0x100082 netio syslogd 35764 322463 1 0 3 0x100080 kqread resolvd 91755 49833 13956 77 3 0x100092 kqread dhcpleased 80102 95002 13956 77 3 0x100092 kqread dhcpleased 13956 519016 1 0 3 0x80 kqread dhcpleased 33105 454918 0 0 3 0x14200 bored smr 41292 386017 0 0 2 0x14200 zerothread 30650 232793 0 0 3 0x14200 aiodoned aiodoned 64733 482163 0 0 3 0x14200 syncer update 80895 89044 0 0 3 0x14200 cleaner cleaner 79756 376123 0 0 7 0x14200 reaper 72777 412102 0 0 3 0x14200 pgdaemon pagedaemon 74839 350621 0 0 3 0x14200 bored viomb 31383 331728 0 0 3 0x40014200 acpi0 acpi0 607 323132 0 0 3 0x40014200 idle1 38320 47109 0 0 3 0x14200 bored softnet3 41515 140678 0 0 3 0x14200 bored softnet2 17956 310422 0 0 3 0x14200 bored softnet1 58578 465656 0 0 3 0x14200 bored softnet0 14225 228297 0 0 3 0x14200 bored systqmp 73065 379947 0 0 3 0x14200 bored systq 29657 193737 0 0 2 0x40014200 softclock 25420 273989 0 0 3 0x40014200 idle0 1 176753 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 2186 (syz-executor.3) thread 0xffff80002121a2c8 (492675) exclusive rrwlock inode r = 0 (0xfffffd806b83b4e8) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:564 #5 vget+0x200 sys/kern/vfs_subr.c:676 #6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1314 #8 ufs_lookup+0x13ba sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x6e2 sys/kern/vfs_lookup.c:566 #11 namei+0x55a sys/kern/vfs_lookup.c:250 #12 dounlinkat+0x9d sys/kern/vfs_syscalls.c:1847 #13 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #13 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8069bed818) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:564 #5 vget+0x200 sys/kern/vfs_subr.c:676 #6 cache_lookup+0x2b4 sys/kern/vfs_cache.c:222 #7 ufs_lookup+0x1ac sys/ufs/ufs/ufs_lookup.c:162 #8 VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85 #9 vfs_lookup+0x6e2 sys/kern/vfs_lookup.c:566 #10 namei+0x55a sys/kern/vfs_lookup.c:250 #11 dounlinkat+0x9d sys/kern/vfs_syscalls.c:1847 #12 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #12 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #13 Xsyscall+0x128 Process 1204 (syz-executor.4) thread 0xffff8000212da008 (60260) exclusive rrwlock inode r = 0 (0xfffffd80689ec098) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 ufs_ihashins+0x46 sys/ufs/ufs/ufs_ihash.c:140 #5 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1343 #6 ffs_inode_alloc+0x1c2 sys/ufs/ffs/ffs_alloc.c:394 #7 ufs_mkdir+0xf8 sys/ufs/ufs/ufs_vnops.c:1149 #8 VOP_MKDIR+0xc3 sys/kern/vfs_vops.c:388 #9 domkdirat+0x125 sys/kern/vfs_syscalls.c:3073 #10 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #10 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806f0ed708) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:564 #5 vfs_lookup+0xd5 sys/kern/vfs_lookup.c:418 #6 namei+0x55a sys/kern/vfs_lookup.c:250 #7 domkdirat+0x79 sys/kern/vfs_syscalls.c:3058 #8 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #8 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10210 6412K 6420K 78643K 11493 0 pcb 13 16K 20K 78643K 19 0 rtable 244 6K 7K 78643K 3637 0 pf 29 8K 8K 78643K 165 0 ifaddr 44 16K 16K 78643K 324 0 ifgroup 50 2K 2K 78643K 322 0 sysctl 2 0K 2K 78643K 69 0 counters 60 35K 35K 78643K 196 0 ioctlops 0 0K 2K 78643K 733 0 iov 0 0K 32K 78643K 3365 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1279 80K 80K 78643K 7214 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 555 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 5340 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 22 81K 101K 78643K 33819 0 sigio 0 0K 0K 78643K 2376 0 proc 56 78K 103K 78643K 4173 0 subproc 104 6K 6K 78643K 988 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 1706 0 in_multi 99 7K 7K 78643K 1151 0 ether_multi 1 0K 0K 78643K 34 0 mrt 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 199 890K 890K 78643K 199 0 exec 0 0K 1K 78643K 5689 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 8 62K 64K 78643K 10 0 UVM amap 541 95K 112K 78643K 329348 0 UVM aobj 131 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 5 0K 1K 78643K 13466 0 NDP 11 0K 2K 78643K 231 0 temp 74 5920K 6000K 78643K 86113 0 kqueue 13 20K 49K 78643K 3620 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 1855 0 1852 23 22 1 3 0 8 0 rtentry 112 907 0 792 4 0 4 4 0 8 0 unpcb 144 19077 0 19062 193 190 3 10 0 8 2 syncache 304 464 0 464 65 65 0 1 0 8 0 tcpqe 32 782 0 782 51 51 0 1 0 8 0 tcpcb 808 13452 0 13401 275 263 12 20 0 8 5 arp 120 162 0 143 1 0 1 1 0 8 0 ipq 40 121 0 121 16 16 0 1 0 8 0 ipqe 40 625 0 625 16 16 0 1 0 8 0 inpcb 368 62908 0 62811 432 421 11 28 0 8 2 nd6 136 268 0 240 3 1 2 2 0 8 0 kcovpl 48 76 0 68 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 3576 0 3106 37 7 30 31 0 8 0 art_table 32 3577 0 3106 4 0 4 4 0 8 0 art_node 16 906 0 801 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 2 1 1 0 1 0 8 0 semupl 112 5 0 5 1 1 0 1 0 8 0 semapl 112 5332 0 5322 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 43973 0 42500 93 0 93 93 0 8 0 ffsino 272 43973 0 42500 99 0 99 99 0 8 0 nchpl 144 87264 0 85617 63 0 63 63 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 284648 0 284647 5 4 1 2 0 8 0 percpumem 16 111 0 68 1 0 1 1 0 8 0 kstatmem 264 158 0 136 2 0 2 2 0 8 0 scxspl 216 272293 0 272293 80 79 1 8 1 8 1 plimitpl 152 5269 0 5246 49 48 1 2 0 8 0 sigapl 424 33973 0 33920 7 0 7 7 0 8 0 futexpl 64 276957 0 276953 5 4 1 1 0 8 0 knotepl 120 1565 0 0 18 2 16 18 0 8 0 kqueuepl 216 9007 0 8998 147 146 1 8 0 8 0 pipepl 320 6653 0 6625 185 181 4 13 0 8 1 fdescpl 496 33955 0 33922 6 1 5 5 0 8 0 filepl 152 228697 0 228381 312 299 13 22 0 8 0 lockfpl 104 4703 0 4668 3 2 1 2 0 8 0 lockfspl 48 1590 0 1587 1 0 1 1 0 8 0 sessionpl 144 91 0 75 1 0 1 1 0 8 0 pgrppl 48 458 0 442 1 0 1 1 0 8 0 ucredpl 104 30288 0 30270 1 0 1 1 0 8 0 zombiepl 144 33923 0 33920 1 0 1 1 0 8 0 processpl 1072 33973 0 33920 4 0 4 4 0 8 0 procpl 680 92828 0 92751 65 57 8 9 0 8 1 sosppl 168 568 0 563 35 34 1 1 0 8 0 sockpl 488 85078 0 84962 1118 1099 19 44 0 8 4 mcl64k 65536 74 0 0 5 3 2 3 0 8 0 mcl16k 16384 50 0 0 5 2 3 3 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 25 0 0 2 0 2 2 0 8 0 mcl8k 8192 41 0 0 4 1 3 3 0 8 0 mcl4k 4096 105 0 0 5 2 3 4 0 8 0 mcl2k2 2112 16 0 0 2 0 2 2 0 8 0 mcl2k 2048 587 0 0 37 17 20 33 0 8 0 mtagpl 96 7 0 0 1 0 1 1 0 8 0 mbufpl 256 2373 0 0 64 0 64 64 0 8 0 bufpl 288 58237 0 51908 453 0 453 453 0 8 0 anonpl 24 3162179 0 3150554 313 216 97 121 0 186 0 amapchunkpl 152 1051410 0 1050545 268 228 40 51 0 158 4 amappl16 200 65335 0 65064 400 383 17 41 0 8 0 amappl15 192 16 0 15 2 1 1 1 0 8 0 amappl14 184 368 0 351 2 1 1 2 0 8 0 amappl13 176 18 0 16 1 0 1 1 0 8 0 amappl12 168 35721 0 35680 3 1 2 3 0 8 0 amappl11 160 65 0 54 1 0 1 1 0 8 0 amappl10 152 120 0 102 1 0 1 1 0 8 0 amappl9 144 458 0 457 1 0 1 1 0 8 0 amappl8 136 2031 0 1723 13 2 11 11 0 8 0 amappl7 128 211 0 195 2 0 2 2 0 8 0 amappl6 120 982 0 954 2 1 1 2 0 8 0 amappl5 112 1205 0 1196 1 0 1 1 0 8 0 amappl4 104 1844 0 1793 3 1 2 3 0 8 0 amappl3 96 203968 0 203875 9 6 3 4 0 8 0 amappl2 88 35547 0 35469 3 1 2 3 0 8 0 amappl1 80 130316 0 129793 22 10 12 22 0 8 0 amappl 88 327108 0 326853 7 0 7 7 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 72 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 33955 0 33922 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 33955 0 33922 1 0 1 1 0 8 0 vmmpekpl 168 255078 0 255024 4 0 4 4 0 8 0 vmmpepl 168 1970105 0 1967560 453 319 134 152 0 357 0 vmsppl 464 33954 0 33922 6 1 5 5 0 8 0 rwobjpl 56 472979 0 465363 132 20 112 115 0 8 0 pdppl 4096 67918 0 67844 1046 964 82 84 0 8 8 pvpl 32 9387089 0 9368975 805 631 174 357 0 265 0 pmappl 248 33954 0 33922 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 2632 0 1743 26 0 26 26 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace witness_checkorder(fffffd806f301370,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f301360) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff80002121b010,fffffd806f301360,fffffd806f3013e8,4,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002121b010,4) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002121b010) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002121b010,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff80002121b010,ffff80002e40af10,ffff80002e40af60) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002e40afe0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002e40afe0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x776b5b845c90, count: -9 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffff800020d58ff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc reaper(ffff8000211b37f0) at reaper+0x160 sys/kern/kern_exit.c:454 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff800020d58ff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc reaper(ffff8000211b37f0) at reaper+0x160 sys/kern/kern_exit.c:454 end trace frame: 0x0, count: -5