panic: Caught invalid memory access at ffff800001cbe56a size 2 op 0 Stopped at db_enter+0x17: popq %rbp TID PID UID PRFLAGS PFLAGS CPU COMMAND *491800 1107 0 0 0x4000000 0K syz-executor 105692 73466 0 0x2 0 1 syz-executor db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff8463c64f) at panic+0x270 sys/kern/subr_prf.c:198 __asan_load2_noabort(ffff800001cbe56a) at __asan_load2_noabort+0x107 knote_processfork(ffffffff85d370e0,b15d) at knote_processfork+0x603 sys/kern/kern_event.c:2289 fork1(ffffffff85d36d80,f0,ffffffff830a12e0,0,0,ffff80003bbc85a0) at fork1+0x1225 sys/kern/kern_fork.c:511 kthread_create(ffffffff830a12e0,0,0,ffffffff84b844a0) at kthread_create+0xa8 sys/kern/kern_kthread.c:61 nfs_getset_niothreads(1) at nfs_getset_niothreads+0xe7 sys/nfs/nfs_syscalls.c:702 nfs_sysctl(ffff80003bbc87a8,1,0,ffff80003bbc8780,200000000200,0,ffff80003bbc89f0) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff800045ff7a10,ffff80003bbc89f0,ffff80003bbc8960) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff80003bbc89f0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bbc89f0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xec822548b90, count: 4 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: Caught invalid memory access at ffff800001cbe56a size 2 op 0 ddb{0}> show kasan KASAN: invalid read of 2 bytes at 0xffff800001cbe56a from pc 0xffffffff8302df13 KASAN: first bad byte at 0xffff800001cbe56a (+0); shadow 0xfd: pool use-after-free (or unallocated item) KASAN: 0xffff800001cbe56a is 50 bytes inside the 120-byte item [0xffff800001cbe538..0xffff800001cbe5b0) in pool 'knotepl' KASAN: allocated at: #0 pool_get+0x770 sys/kern/subr_pool.c:834 #1 kqueue_register+0x2f2 sys/kern/kern_event.c:1431 #2 sys_kevent+0x409 sys/kern/kern_event.c:1301 #3 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #4 Xsyscall+0x128 KASAN: freed at: #0 pool_put+0x79 sys/kern/subr_pool.c:1019 #1 kqueue_scan+0x1191 sys/kern/kern_event.c:1797 #2 sys_kevent+0x997 sys/kern/kern_event.c:1336 #3 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #4 Xsyscall+0x128 KASAN: pc: knote_processfork+0x603 KASAN: call trace: #0 __asan_load2_noabort+0xe6 kasan_shadow_check sys/kern/subr_kasan.c:-1 [inline] #0 __asan_load2_noabort+0xe6 sys/kern/subr_kasan.c:1097 #1 knote_processfork+0x603 sys/kern/kern_event.c:2289 #2 fork1+0x1225 sys/kern/kern_fork.c:511 #3 kthread_create+0xa8 sys/kern/kern_kthread.c:61 #4 nfs_getset_niothreads+0xe7 sys/nfs/nfs_syscalls.c:702 #5 nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 #6 sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 #7 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #7 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #8 Xsyscall+0x128 KASAN: shadow of 0xffff800001cbe400..0xffff800001cbe680 (1 cell = 8 bytes): 0xffff800001cbe400: 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 0xffff800001cbe480: 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 >0xffff800001cbe500: 08 08 08 08 08 08 08 fd fd fd fd fd fd[fd]fd fd 0xffff800001cbe580: fd fd fd fd fd fd 08 08 08 08 08 08 08 08 08 08 0xffff800001cbe600: 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 KASAN: legend: 00 valid; 01..07 partial; fb malloc redzone; fc malloc freed; fd pool freed; fe kmem; fa global; f1..f4/f8 stack/scope ddb{0}> trace db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff8463c64f) at panic+0x270 sys/kern/subr_prf.c:198 __asan_load2_noabort(ffff800001cbe56a) at __asan_load2_noabort+0x107 knote_processfork(ffffffff85d370e0,b15d) at knote_processfork+0x603 sys/kern/kern_event.c:2289 fork1(ffffffff85d36d80,f0,ffffffff830a12e0,0,0,ffff80003bbc85a0) at fork1+0x1225 sys/kern/kern_fork.c:511 kthread_create(ffffffff830a12e0,0,0,ffffffff84b844a0) at kthread_create+0xa8 sys/kern/kern_kthread.c:61 nfs_getset_niothreads(1) at nfs_getset_niothreads+0xe7 sys/nfs/nfs_syscalls.c:702 nfs_sysctl(ffff80003bbc87a8,1,0,ffff80003bbc8780,200000000200,0,ffff80003bbc89f0) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff800045ff7a10,ffff80003bbc89f0,ffff80003bbc8960) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff80003bbc89f0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bbc89f0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xec822548b90, count: -11 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003bbc8150 rbx 0xffff80003bbc81c0 rdx 0 rcx 0xffffffff84f15ff0 cpu_info_full_primary+0x1ff0 rax 0xffff80000012f400 r8 0x101010101010101 r9 0x8080808080808080 r10 0xffff80003bbc7f38 r11 0xffffffff8237d880 x86_bus_space_io_read_1 r12 0xffffffff8463c64f .str.26+0x9a28f r13 0xffffffff84f16c10 cpu_info_full_primary+0x2c10 r14 0xffffffff84f16e0f cpu_info_full_primary+0x2e0f r15 0x1 rip 0xffffffff8389f5d7 db_enter+0x17 cs 0x8 rflags 0x246 rsp 0xffff80003bbc8150 ss 0x10 db_enter+0x17: popq %rbp ddb{0}> show proc PROC (syz-executor) tid=491800 pid=1107 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=72, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800045ff62b8,0xffff80003bbb7790 process=0xffff800045ff9358 user=0xffff80003bbbd000, vmspace=0xffff800001c99d80 estcpu=22, cpticks=27, pctcpu=0.0, user=0, sys=27, intr=0 ddb{0}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 45405 494128 0 0 2 0x14000 0x200 swapper 1107 373306 2495 0 2 0 0 syz-executor 1107 25569 2495 0 3 0 0x4000080 fsleep syz-executor 1107 352 2495 0 2 0 0x4000080 syz-executor * 1107 491800 2495 0 7 0 0x4000000 syz-executor 47896 450162 74380 0 2 0 0 syz-executor 47896 228906 74380 0 3 0 0x4000080 fsleep syz-executor 32141 25941 60878 0 2 0 0 syz-executor 32141 269846 60878 0 3 0 0x4000080 fsleep syz-executor 48339 132374 73466 0 2 0x10 0xc80 syz-executor 48339 439196 73466 0 2 0x10 0x4000000 syz-executor 48339 177166 73466 0 3 0x10 0x4000080 fsleep syz-executor 78875 191649 42893 0 2 0 0xc80 syz-executor 78875 23190 42893 0 3 0 0x4000080 fsleep syz-executor 78875 366422 42893 0 2 0 0x4000000 syz-executor 69530 70561 95448 0 2 0 0 syz-executor 69530 252143 95448 0 2 0 0x4000000 syz-executor 69530 497923 95448 0 3 0 0x4000080 fsleep syz-executor 69530 47470 95448 0 3 0 0x4000080 fsleep syz-executor 56442 59020 70656 0 2 0x10 0 syz-executor 56442 34676 70656 0 3 0x10 0x4000080 fsleep syz-executor 60878 10756 84598 0 2 0x2 0xc80 syz-executor 73466 105692 84598 0 7 0x2 0 syz-executor 95448 63656 84598 0 2 0x2 0 syz-executor 70656 338689 84598 0 2 0x2 0 syz-executor 10255 473175 84598 0 2 0x2 0 syz-executor 2495 101712 84598 0 2 0x2 0xc80 syz-executor 42893 385067 84598 0 2 0x2 0xc80 syz-executor 74380 49853 84598 0 2 0x2 0xc80 syz-executor 84598 326968 45243 0 3 0x2 0x80 kqread syz-executor 45243 366944 34502 0 3 0x100002 0x88 sigsusp ksh 34502 107562 38628 0 3 0x10 0x88 kqread sshd-session 38628 2688 76341 0 3 0x12 0x80 kqread sshd-session 87308 334507 1 0 3 0x100003 0x80 ttyin getty 76341 320469 1 0 3 0 0x88 kqread sshd 64897 480307 68781 74 3 0x1100012 0x80 bpf pflogd 68781 65893 1 0 3 0 0x80 sbwait pflogd 84667 315820 1801 73 2 0x1100010 0x80 syslogd 1801 219167 1 0 3 0x100002 0x80 sbwait syslogd 83585 151166 1 0 3 0x100000 0x80 kqread resolvd 25694 498197 67625 77 3 0x100012 0x80 kqread dhcpleased 22278 473428 67625 77 3 0x100012 0x80 kqread dhcpleased 67625 281776 1 0 3 0 0x80 kqread dhcpleased 69030 448678 0 0 3 0x14000 0x200 bored smr 99777 435389 0 0 2 0x14000 0x200 zerothread 43620 440841 0 0 3 0x14000 0x200 aiodoned aiodoned 45770 379107 0 0 3 0x14000 0x200 syncer update 63448 419372 0 0 3 0x14000 0x200 cleaner cleaner 88129 178789 0 0 3 0x14000 0x200 reaper reaper 75419 392682 0 0 3 0x14000 0x200 pgdaemon pagedaemon 75229 76727 0 0 3 0x14000 0x200 bored viomb 42026 270793 0 0 3 0x14000 0x40000200 acpi0 acpi0 75637 4665 0 0 3 0x14000 0x40000200 idle1 39116 331978 0 0 3 0x14000 0x200 bored softnet1 52741 250552 0 0 2 0x14000 0x200 softnet0 99201 438289 0 0 3 0x14000 0x200 bored systqmp 12492 452371 0 0 3 0x14000 0x200 bored systq 49814 511942 0 0 2 0x14000 0x200 softclockmp 10279 411109 0 0 3 0x14000 0x40000200 tmoslp softclock 31046 257036 0 0 3 0x14000 0x40000200 idle0 1 414736 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{0}> show all locks Process 1107 (syz-executor) thread 0xffff800045ff7a10 (491800) exclusive kernel_lock &kernel_lock r = 1 (0xffffffff85cda380) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 sysctl_vslock+0x72 sys/kern/kern_sysctl.c:197 #2 sys_sysctl+0x460 sys/kern/kern_sysctl.c:304 #3 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #4 Xsyscall+0x128 exclusive rwlock sysctllk r = 0 (0xffffffff85073238) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x53e sys/kern/kern_rwlock.c:320 #2 sysctl_vslock+0x37 sys/kern/kern_sysctl.c:192 #3 sys_sysctl+0x460 sys/kern/kern_sysctl.c:304 #4 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #5 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11052 12243K 12322K 166960K 12149 0 pcb 18 24K 24K 166960K 26 0 rtable 237 12K 13K 166960K 351 0 pf 34 22K 22K 166960K 45 0 ifaddr 43 12K 12K 166960K 45 0 ifgroup 55 2K 2K 166960K 55 0 sysctl 1 1K 13K 166960K 5 0 counters 70 42K 42K 166960K 70 0 ioctlops 0 0K 4K 166960K 1485 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1293 83K 83K 166960K 1367 0 UFS quota 1 36K 36K 166960K 1 0 UFS mount 5 44K 44K 166960K 5 0 shm 2 2K 2K 166960K 2 0 VM map 2 1K 1K 166960K 2 0 sem 2 0K 0K 166960K 2 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 97K 166960K 139 0 proc 69 128K 193K 166960K 551 0 subproc 72 9K 9K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 20K 20K 166960K 1 0 in_multi 99 7K 7K 166960K 99 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 2 0 ISOFS mount 1 36K 36K 166960K 1 0 MSDOSFS mount 1 20K 20K 166960K 1 0 ttys 25 182K 182K 166960K 25 0 exec 0 0K 2K 166960K 383 0 fusefs mount 1 36K 36K 166960K 1 0 tdb 3 1K 1K 166960K 3 0 VM swap 14 124K 124K 166960K 15 0 UVM amap 237 257K 280K 166960K 3072 0 UVM aobj 4 4K 4K 166960K 4 0 pinsyscall 1066 1715K 1730K 166960K 1298 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 12 0K 2K 166960K 28 0 temp 34 9162K 9172K 166960K 3915 0 kqueue 16 46K 46K 166960K 28 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 28 0 0 1 0 1 1 0 8 0 rtpcb 120 33 0 30 1 0 1 1 0 8 0 rtentry 176 111 0 1 5 0 5 5 0 8 0 unpcb 144 47 0 24 1 0 1 1 0 8 0 syncache 336 4 0 4 2 2 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpcb 736 11 0 5 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 78 0 60 2 0 2 2 0 8 0 nd6 152 24 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 pffrent 40 1 0 1 1 0 1 1 0 8 1 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 27 0 0 1 0 1 1 0 8 0 pfstkey 128 27 0 0 1 0 1 1 0 8 0 pfstate 448 27 0 0 3 0 3 3 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 452 0 0 29 0 29 29 0 8 0 art_table 40 453 0 0 5 0 5 5 0 8 0 art_node 32 111 0 11 1 0 1 1 0 8 0 shmpl 112 1 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1570 0 100 92 0 92 92 0 8 0 ffsino 296 1570 0 100 114 0 114 114 0 8 0 nchpl 144 1770 0 60 64 0 64 64 0 8 0 vnodes 216 1661 0 0 93 0 93 93 0 8 0 namei 1024 6144 0 6144 3 1 2 2 0 8 2 percpumem 16 51 0 0 1 0 1 1 0 8 0 kstatmem 264 27 0 0 2 0 2 2 0 8 0 scxspl 216 6600 0 6600 5 4 1 3 1 8 1 plimitpl 152 29 0 12 1 0 1 1 0 8 0 sigapl 424 458 0 410 7 0 7 7 0 8 1 knotepl 120 89 0 0 3 0 3 3 0 8 0 kqueuepl 224 24 0 12 1 0 1 1 0 8 0 pipepl 344 128 0 99 3 0 3 3 0 8 0 fdescpl 528 441 0 410 3 0 3 3 0 8 0 filepl 160 1597 0 1354 11 0 11 11 0 8 0 lockfpl 104 8 0 5 1 0 1 1 0 8 0 lockfspl 48 5 0 2 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 32 0 15 1 0 1 1 0 8 0 ucredpl 104 84 0 69 1 0 1 1 0 8 0 zombiepl 144 410 0 410 2 1 1 1 0 8 1 processpl 1232 458 0 410 5 1 4 5 0 8 0 procpl 664 474 0 413 6 0 6 6 0 8 0 sockpl 752 158 0 113 5 0 5 5 0 8 0 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl9k128 9344 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 113 0 0 15 0 15 15 0 8 0 mcl2k 2048 31 0 0 4 0 4 4 0 8 0 mextrefs 64 25 0 0 1 0 1 1 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 204 0 0 13 0 13 13 0 8 0 bufpl 272 2320 0 106 148 0 148 148 0 8 0 anonpl 32 3851 0 0 31 0 31 31 0 222 0 amapchunkpl 152 8374 0 7868 20 0 20 20 0 158 0 amappl16 200 1864 0 1849 5 4 1 5 0 8 0 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 445 0 444 1 0 1 1 0 8 0 amappl13 176 123 0 111 1 0 1 1 0 8 0 amappl12 168 692 0 661 2 0 2 2 0 8 0 amappl11 160 12 0 12 2 2 0 1 0 8 0 amappl10 152 116 0 102 1 0 1 1 0 8 0 amappl9 144 313 0 313 1 1 0 1 0 8 0 amappl8 136 171 0 170 1 0 1 1 0 8 0 amappl7 128 150 0 137 1 0 1 1 0 8 0 amappl6 120 157 0 156 1 0 1 1 0 8 0 amappl5 112 101 0 91 1 0 1 1 0 8 0 amappl4 104 296 0 277 1 0 1 1 0 8 0 amappl3 96 1463 0 1362 3 0 3 3 0 8 0 amappl2 88 570 0 487 2 0 2 2 0 8 0 amappl1 80 10409 0 9806 15 0 15 15 0 8 0 amappl 88 2346 0 2181 4 0 4 4 0 92 0 uvmvnodes 80 98 0 0 2 0 2 2 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 441 0 410 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 441 0 410 1 0 1 1 0 8 0 vmmpekpl 168 5686 0 5651 2 0 2 2 0 8 0 vmmpepl 168 38498 0 36593 88 2 86 87 0 357 1 vmsppl 488 440 0 410 6 1 5 5 0 8 0 rwobjpl 80 14616 0 13590 24 1 23 24 0 8 0 pdppl 4096 890 0 820 108 34 74 88 0 8 4 pvpl 32 9936 0 0 81 0 81 81 0 265 0 pmappl 256 440 0 410 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 120 433 0 40 13 0 13 13 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff8463c64f) at panic+0x270 sys/kern/subr_prf.c:198 __asan_load2_noabort(ffff800001cbe56a) at __asan_load2_noabort+0x107 knote_processfork(ffffffff85d370e0,b15d) at knote_processfork+0x603 sys/kern/kern_event.c:2289 fork1(ffffffff85d36d80,f0,ffffffff830a12e0,0,0,ffff80003bbc85a0) at fork1+0x1225 sys/kern/kern_fork.c:511 kthread_create(ffffffff830a12e0,0,0,ffffffff84b844a0) at kthread_create+0xa8 sys/kern/kern_kthread.c:61 nfs_getset_niothreads(1) at nfs_getset_niothreads+0xe7 sys/nfs/nfs_syscalls.c:702 nfs_sysctl(ffff80003bbc87a8,1,0,ffff80003bbc8780,200000000200,0,ffff80003bbc89f0) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff800045ff7a10,ffff80003bbc89f0,ffff80003bbc8960) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff80003bbc89f0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bbc89f0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xec822548b90, count: -11 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x19: leave x86_ipi_db(ffff800028fe3ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412 x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __asan_load4_noabort(ffffffff85cda378) at __asan_load4_noabort+0x60 sys/kern/subr_kasan.c:1098 __mp_lock(ffffffff85cd9b80) at __mp_lock+0x27a __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85cd9b80) at __mp_lock+0x27a sys/kern/kern_lock.c:173 syscall(ffff800029aa4600) at syscall+0x1048 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff800029aa4600) at syscall+0x1048 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7dc5f0074290, count: 8 ddb{1}> trace x86_ipi_db(ffff800028fe3ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412 x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __asan_load4_noabort(ffffffff85cda378) at __asan_load4_noabort+0x60 sys/kern/subr_kasan.c:1098 __mp_lock(ffffffff85cd9b80) at __mp_lock+0x27a __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85cd9b80) at __mp_lock+0x27a sys/kern/kern_lock.c:173 syscall(ffff800029aa4600) at syscall+0x1048 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff800029aa4600) at syscall+0x1048 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7dc5f0074290, count: -7