panic: Caught invalid memory access at ffff800001b051a2 size 2 op 0 Stopped at db_enter+0x17: popq %rbp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 6672 26156 0 0 0x4000000 0K syz-executor 370868 98435 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(ffff800001b051a2) at __asan_load2_noabort+0x107 knote_processfork(ffffffff85d370e0,a291) at knote_processfork+0x603 sys/kern/kern_event.c:2289 fork1(ffffffff85d36d80,f0,ffffffff830a12e0,0,0,ffff80003bb943e0) 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(ffff80003bb945e8,1,0,ffff80003bb945c0,200000000200,0,ffff80003bb94840) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff800045ff7780,ffff80003bb94840,ffff80003bb947a0) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff80003bb94840) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bb94840) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3d8a203d5d0, 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 ffff800001b051a2 size 2 op 0 ddb{0}> show kasan KASAN: invalid read of 2 bytes at 0xffff800001b051a2 from pc 0xffffffff8302df13 KASAN: first bad byte at 0xffff800001b051a2 (+0); shadow 0xfd: pool use-after-free (or unallocated item) KASAN: 0xffff800001b051a2 is 50 bytes inside the 120-byte item [0xffff800001b05170..0xffff800001b051e8) 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 0xffff800001b05080..0xffff800001b05300 (1 cell = 8 bytes): 0xffff800001b05080: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd 08 0xffff800001b05100: 08 08 08 08 08 08 08 08 08 08 08 08 08 08 fd fd >0xffff800001b05180: fd fd fd fd[fd]fd fd fd fd fd fd fd fd 08 08 08 0xffff800001b05200: 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 0xffff800001b05280: 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(ffff800001b051a2) at __asan_load2_noabort+0x107 knote_processfork(ffffffff85d370e0,a291) at knote_processfork+0x603 sys/kern/kern_event.c:2289 fork1(ffffffff85d36d80,f0,ffffffff830a12e0,0,0,ffff80003bb943e0) 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(ffff80003bb945e8,1,0,ffff80003bb945c0,200000000200,0,ffff80003bb94840) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff800045ff7780,ffff80003bb94840,ffff80003bb947a0) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff80003bb94840) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bb94840) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3d8a203d5d0, count: -11 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003bb93f90 rbx 0xffff80003bb94000 rdx 0 rcx 0xffffffff84f15ff0 cpu_info_full_primary+0x1ff0 rax 0xffff800000167500 r8 0x101010101010101 r9 0x8080808080808080 r10 0xffff80003bb93d78 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 0xffff80003bb93f90 ss 0x10 db_enter+0x17: popq %rbp ddb{0}> show proc PROC (syz-executor) tid=6672 pid=26156 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800045ff7a18,0xffff800045ff6038 process=0xffff800045ff0e90 user=0xffff80003bb89000, vmspace=0xffff800001c863f0 estcpu=36, cpticks=28, pctcpu=0.0, user=0, sys=28, intr=0 ddb{0}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 41617 302517 0 0 2 0x14000 0x200 swapper 59903 362095 75748 0 2 0 0 syz-executor 59903 467357 75748 0 3 0 0x4000080 sbwait syz-executor 39934 320316 9735 0 2 0 0 syz-executor 39934 347172 9735 0 3 0 0x4000080 fsleep syz-executor 39803 313246 56129 0 2 0x100000 0 sh 5408 174434 98435 0 2 0 0 syz-executor 5408 48022 98435 0 3 0 0x4000080 kqsel syz-executor 24608 290679 56830 0 2 0x100002 0 ndp 56830 383026 3053 0 3 0x100002 0x88 sigsusp sh 56129 215093 48679 0 3 0x100002 0x88 sigsusp sh 26156 10209 28659 0 2 0 0 syz-executor 26156 353106 28659 0 3 0 0x4000080 fsleep syz-executor 26156 125008 28659 0 3 0 0x4000080 kqread syz-executor *26156 6672 28659 0 7 0 0x4000000 syz-executor 363 103562 72164 0 2 0 0 syz-executor 363 236250 72164 0 3 0 0x4000080 fsleep syz-executor 363 475940 72164 0 2 0 0x4000000 syz-executor 75748 98524 29178 0 2 0x2 0xc80 syz-executor 9735 148507 29178 0 2 0x2 0xc80 syz-executor 99288 460485 29178 0 2 0x2 0xc80 syz-executor 98435 370868 29178 0 7 0x2 0 syz-executor 28659 485393 29178 0 2 0x2 0xc80 syz-executor 48679 349874 29178 0 3 0x2 0x80 wait syz-executor 3053 205796 29178 0 3 0x2 0x80 wait syz-executor 72164 434952 29178 0 2 0x2 0xc80 syz-executor 29178 143332 48447 0 3 0x2 0x80 kqread syz-executor 48447 252426 75548 0 3 0x100002 0x88 sigsusp ksh 75548 66205 13493 0 3 0x10 0x88 kqread sshd-session 13493 162528 27327 0 3 0x12 0x80 kqread sshd-session 38542 377243 1 0 3 0x100003 0x80 ttyin getty 27327 521294 1 0 3 0 0x88 kqread sshd 39259 179038 69258 74 3 0x1100012 0x80 bpf pflogd 69258 405878 1 0 3 0 0x80 sbwait pflogd 80388 346991 20496 73 2 0x1100010 0x80 syslogd 20496 367495 1 0 3 0x100002 0x80 sbwait syslogd 78085 97466 1 0 3 0x100000 0x80 kqread resolvd 80462 204457 53806 77 3 0x100012 0x80 kqread dhcpleased 3106 48265 53806 77 3 0x100012 0x80 kqread dhcpleased 53806 90294 1 0 3 0 0x80 kqread dhcpleased 27894 309940 0 0 2 0x14000 0x200 smr 11593 157293 0 0 2 0x14000 0x200 zerothread 55338 239819 0 0 3 0x14000 0x200 aiodoned aiodoned 50909 471142 0 0 2 0x14000 0xe00 update 94703 404096 0 0 3 0x14000 0x200 cleaner cleaner 84031 405557 0 0 3 0x14000 0x200 reaper reaper 49428 319763 0 0 3 0x14000 0x200 pgdaemon pagedaemon 5449 329211 0 0 3 0x14000 0x200 bored viomb 82240 482264 0 0 3 0x14000 0x40000200 acpi0 acpi0 83171 422058 0 0 3 0x14000 0x40000200 idle1 53795 384537 0 0 3 0x14000 0x200 bored softnet1 38299 360993 0 0 3 0x14000 0x200 bored softnet0 81596 17117 0 0 2 0x14000 0x200 systqmp 29340 55095 0 0 3 0x14000 0x200 bored systq 99419 364590 0 0 2 0x14000 0x200 softclockmp 67803 207050 0 0 2 0x14000 0x40000200 softclock 76994 229653 0 0 3 0x14000 0x40000200 idle0 1 265601 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{0}> show all locks Process 26156 (syz-executor) thread 0xffff800045ff7780 (6672) 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 11057 12253K 12253K 166960K 12150 0 pcb 17 24K 24K 166960K 18 0 rtable 233 12K 12K 166960K 339 0 pf 37 23K 25K 166960K 49 0 ifaddr 44 12K 12K 166960K 46 0 ifgroup 60 2K 2K 166960K 60 0 sysctl 1 1K 13K 166960K 5 0 counters 72 43K 43K 166960K 72 0 ioctlops 0 0K 4K 166960K 1487 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1295 83K 83K 166960K 1372 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 20 73K 97K 166960K 139 0 proc 69 128K 209K 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 1 0 ISOFS mount 1 36K 36K 166960K 1 0 MSDOSFS mount 1 20K 20K 166960K 1 0 ttys 37 263K 263K 166960K 37 0 exec 0 0K 2K 166960K 381 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 233 224K 239K 166960K 3118 0 UVM aobj 3 4K 4K 166960K 3 0 pinsyscall 1070 1720K 1730K 166960K 1292 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 29 2K 2K 166960K 29 0 temp 34 9162K 9174K 166960K 3891 0 kqueue 15 42K 42K 166960K 27 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 32 0 28 1 0 1 1 0 8 0 rtentry 176 109 0 1 5 0 5 5 0 8 0 unpcb 144 44 0 24 1 0 1 1 0 8 0 syncache 336 4 0 4 2 1 1 1 0 8 1 tcpcb 736 9 0 4 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 67 0 59 2 0 2 2 0 8 1 nd6 152 22 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 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 256 450 0 0 29 0 29 29 0 8 0 art_table 40 451 0 0 5 0 5 5 0 8 0 art_node 32 109 0 11 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1571 0 103 92 0 92 92 0 8 0 ffsino 296 1571 0 103 113 0 113 113 0 8 0 nchpl 144 1767 0 66 63 0 63 63 0 8 0 vnodes 216 1664 0 0 93 0 93 93 0 8 0 namei 1024 6140 0 6140 2 0 2 2 0 8 2 percpumem 16 52 0 0 1 0 1 1 0 8 0 kstatmem 264 29 0 0 2 0 2 2 0 8 0 scxspl 216 6603 0 6603 3 1 2 2 1 8 2 plimitpl 152 29 0 12 1 0 1 1 0 8 0 sigapl 424 457 0 406 8 1 7 7 0 8 1 knotepl 120 58 0 0 2 0 2 2 0 8 0 kqueuepl 224 24 0 12 1 0 1 1 0 8 0 pipepl 344 126 0 99 3 0 3 3 0 8 0 fdescpl 528 440 0 406 3 0 3 3 0 8 0 filepl 160 1576 0 1357 10 0 10 10 0 8 0 lockfpl 104 8 0 6 1 0 1 1 0 8 0 lockfspl 48 5 0 3 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 91 0 78 1 0 1 1 0 8 0 zombiepl 144 407 0 406 1 0 1 1 0 8 0 processpl 1232 457 0 406 5 0 5 5 0 8 0 procpl 664 470 0 411 6 1 5 5 0 8 0 sockpl 752 143 0 111 4 0 4 4 0 8 0 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 119 0 0 15 0 15 15 0 8 0 mcl2k 2048 20 0 0 3 0 3 3 0 8 0 mextrefs 64 20 0 0 1 0 1 1 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 157 0 0 10 0 10 10 0 8 0 bufpl 272 2312 0 106 148 0 148 148 0 8 0 anonpl 32 3897 0 0 32 0 32 32 0 222 0 amapchunkpl 152 8448 0 7975 20 1 19 19 0 158 0 amappl16 200 2017 0 2002 5 0 5 5 0 8 4 amappl15 192 3 0 3 1 1 0 1 0 8 0 amappl14 184 435 0 432 1 0 1 1 0 8 0 amappl13 176 126 0 113 1 0 1 1 0 8 0 amappl12 168 690 0 658 2 0 2 2 0 8 0 amappl11 160 5 0 5 2 2 0 1 0 8 0 amappl10 152 73 0 59 1 0 1 1 0 8 0 amappl9 144 278 0 278 1 0 1 1 0 8 1 amappl8 136 95 0 94 1 0 1 1 0 8 0 amappl7 128 152 0 138 1 0 1 1 0 8 0 amappl6 120 155 0 152 1 0 1 1 0 8 0 amappl5 112 104 0 93 1 0 1 1 0 8 0 amappl4 104 309 0 288 1 0 1 1 0 8 0 amappl3 96 1422 0 1326 3 0 3 3 0 8 0 amappl2 88 558 0 481 2 0 2 2 0 8 0 amappl1 80 10442 0 9815 15 0 15 15 0 8 1 amappl 88 2398 0 2239 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 440 0 406 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 440 0 406 1 0 1 1 0 8 0 vmmpekpl 168 5708 0 5678 2 0 2 2 0 8 0 vmmpepl 168 38116 0 36170 89 0 89 89 0 357 4 vmsppl 488 439 0 406 5 0 5 5 0 8 0 rwobjpl 80 14770 0 13719 26 1 25 25 0 8 1 pdppl 4096 888 0 812 100 12 88 88 0 8 12 pvpl 32 9429 0 0 78 1 77 77 0 265 0 pmappl 256 439 0 406 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 120 420 0 16 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(ffff800001b051a2) at __asan_load2_noabort+0x107 knote_processfork(ffffffff85d370e0,a291) at knote_processfork+0x603 sys/kern/kern_event.c:2289 fork1(ffffffff85d36d80,f0,ffffffff830a12e0,0,0,ffff80003bb943e0) 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(ffff80003bb945e8,1,0,ffff80003bb945c0,200000000200,0,ffff80003bb94840) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff800045ff7780,ffff80003bb94840,ffff80003bb947a0) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff80003bb94840) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bb94840) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3d8a203d5d0, 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x21 kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x21 sys/dev/kcov.c:153 __mp_lock(ffffffff85cd9b80) at __mp_lock+0x290 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85cd9b80) at __mp_lock+0x290 sys/kern/kern_lock.c:173 syscall(ffff800029a5cba0) at syscall+0x1048 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff800029a5cba0) at syscall+0x1048 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ec4f381d450, 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x21 kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x21 sys/dev/kcov.c:153 __mp_lock(ffffffff85cd9b80) at __mp_lock+0x290 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85cd9b80) at __mp_lock+0x290 sys/kern/kern_lock.c:173 syscall(ffff800029a5cba0) at syscall+0x1048 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff800029a5cba0) at syscall+0x1048 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ec4f381d450, count: -7