panic: amap_pp_adjref: negative reference count Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 260436 47835 32767 0x10 0x4000000 1 syz-executor *283632 34535 0 0 0 0K sshd db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83525295) at panic+0x1e5 sys/kern/subr_prf.c:198 amap_pp_adjref(fffff780777f1790,0,1,1) at amap_pp_adjref+0x74c sys/uvm/uvm_amap.c:880 amap_adjref_anons(fffff780777f1790,0,1,1,0) at amap_adjref_anons+0x22d sys/uvm/uvm_amap.c:1298 uvm_mapent_clone(fffff7806bde0028,c91fc250000,1000,0,1,7,61756f43285a9b73,fffff7806e3e8aa8,ffff80002a284058,fffff7806bde0028) at uvm_mapent_clone+0x17e sys/uvm/uvm_map.c:3503 uvm_mapent_forkcopy(1,fffff7806bde0028,fffff7800b1cb3d0,fffff7806e3e8aa8,ffff80002a284058) at uvm_mapent_forkcopy+0x6f sys/uvm/uvm_map.c:3573 uvmspace_fork(ffff800045ff3500) at uvmspace_fork+0x299 sys/uvm/uvm_map.c:3776 process_new(ffff800045fe2028,ffff800045ff3500,1) at process_new+0x583 sys/kern/kern_fork.c:282 fork1(ffff80002a222010,1,ffffffff811282c0,0,ffff80002a284230,0) at fork1+0x3f6 sys/kern/kern_fork.c:-1 syscall(ffff80002a2842e0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2842e0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ef3e0cf87f0, 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: amap_pp_adjref: negative reference count ddb{0}> show kasan No such command ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83525295) at panic+0x1e5 sys/kern/subr_prf.c:198 amap_pp_adjref(fffff780777f1790,0,1,1) at amap_pp_adjref+0x74c sys/uvm/uvm_amap.c:880 amap_adjref_anons(fffff780777f1790,0,1,1,0) at amap_adjref_anons+0x22d sys/uvm/uvm_amap.c:1298 uvm_mapent_clone(fffff7806bde0028,c91fc250000,1000,0,1,7,61756f43285a9b73,fffff7806e3e8aa8,ffff80002a284058,fffff7806bde0028) at uvm_mapent_clone+0x17e sys/uvm/uvm_map.c:3503 uvm_mapent_forkcopy(1,fffff7806bde0028,fffff7800b1cb3d0,fffff7806e3e8aa8,ffff80002a284058) at uvm_mapent_forkcopy+0x6f sys/uvm/uvm_map.c:3573 uvmspace_fork(ffff800045ff3500) at uvmspace_fork+0x299 sys/uvm/uvm_map.c:3776 process_new(ffff800045fe2028,ffff800045ff3500,1) at process_new+0x583 sys/kern/kern_fork.c:282 fork1(ffff80002a222010,1,ffffffff811282c0,0,ffff80002a284230,0) at fork1+0x3f6 sys/kern/kern_fork.c:-1 syscall(ffff80002a2842e0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2842e0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ef3e0cf87f0, count: -11 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a283d20 rbx 0xffffffff839dee07 cpu_info_full_primary+0x2e07 rdx 0 rcx 0xffff80002a222010 rax 0xffffffff839ddff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x1af1c2b2a3b65f8b r11 0xed9ccda832ce297f r12 0xffffffff839dec08 cpu_info_full_primary+0x2c08 r13 0 r14 0 r15 0x1 rip 0xffffffff82f21205 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a283d10 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (sshd) tid=283632 pid=34535 tcnt=1 stat=onproc flags process=0 proc=0 runpri=50, usrpri=86, slppri=24, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a223a00,0xffff800045ffc7e0 process=0xffff800045ff3500 user=0xffff80002a27f000, vmspace=0xfffff7800b1cb3d0 estcpu=36, cpticks=12181, pctcpu=20.48, user=1, sys=12169, intr=11 ddb{0}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 89914 28202 51829 32767 2 0x10 0 syz-executor 89914 300481 51829 32767 2 0x10 0x4000c80 syz-executor 65730 120722 29027 32767 2 0x11 0 syz-executor 65730 319174 29027 32767 3 0x11 0x4000080 fsleep syz-executor 47835 116196 17860 32767 2 0x10 0 syz-executor 47835 260436 17860 32767 7 0x10 0x4000000 syz-executor 87930 482740 38497 32767 2 0x10 0xc80 syz-executor 87930 378726 38497 32767 2 0x10 0x4000c80 syz-executor 87930 192977 38497 32767 3 0x10 0x4000080 fsleep syz-executor 87930 358944 38497 32767 3 0x10 0x4000080 fsleep syz-executor 5180 507715 96966 32767 3 0x10 0x80 piperd syz-executor 51829 403529 14009 32767 2 0x10 0xc80 syz-executor 74883 181576 72223 32767 3 0x10 0x80 piperd syz-executor 17860 436795 67670 32767 2 0x10 0xc80 syz-executor 38497 433179 38941 32767 2 0x10 0xc80 syz-executor 28166 241782 53137 32767 2 0x10 0xc80 syz-executor 29027 491369 53162 32767 2 0x10 0xc80 syz-executor 96966 219806 60669 0 3 0x2 0x80 wait syz-executor 14009 391087 60669 0 3 0x2 0x80 wait syz-executor 72223 461661 60669 0 3 0x2 0x80 wait syz-executor 53162 405313 60669 0 3 0x2 0x80 wait syz-executor 53137 177775 60669 0 3 0x2 0x80 wait syz-executor 67670 218639 60669 0 3 0x2 0x80 wait syz-executor 38941 406854 60669 0 3 0x2 0x80 wait syz-executor 60669 473924 90171 0 2 0x2 0xc80 syz-executor 90171 407680 14127 0 3 0x100002 0x88 sigsusp ksh 14127 182360 6852 0 3 0x10 0x88 kqread sshd-session 6852 339815 34535 0 3 0x12 0x80 kqread sshd-session 43624 59080 1 0 3 0x100003 0x80 ttyin getty *34535 283632 1 0 7 0 0 sshd 55899 244178 74039 73 2 0x1100010 0xc80 syslogd 74039 368889 1 0 3 0x100002 0x80 sbwait syslogd 49073 514073 1 0 3 0x100000 0x80 kqread resolvd 23192 324869 1154 77 3 0x100012 0x80 kqread dhcpleased 61594 361355 1154 77 3 0x100012 0x80 kqread dhcpleased 1154 417740 1 0 3 0 0x80 kqread dhcpleased 40728 12149 0 0 2 0x14000 0x200 smr 41608 450091 0 0 3 0x14000 0x200 pgzero zerothread 77282 504273 0 0 3 0x14000 0x200 aiodoned aiodoned 91019 378587 0 0 2 0x14000 0xe00 update 46619 177367 0 0 3 0x14000 0x200 cleaner cleaner 56611 293163 0 0 3 0x14000 0x200 reaper reaper 41817 107905 0 0 3 0x14000 0x200 pgdaemon pagedaemon 19026 158287 0 0 3 0x14000 0x200 bored viomb 62224 364727 0 0 3 0x14000 0x40000200 acpi0 acpi0 27974 326877 0 0 3 0x14000 0x40000200 idle1 30052 312672 0 0 3 0x14000 0x200 bored softnet1 64234 387636 0 0 2 0x14000 0x200 softnet0 28406 412893 0 0 3 0x14000 0x200 smrbar systqmp 90336 302539 0 0 3 0x14000 0x200 bored systq 35134 405212 0 0 2 0x14000 0x200 softclockmp 76040 347905 0 0 3 0x14000 0x40000200 tmoslp softclock 15173 297094 0 0 3 0x14000 0x40000200 idle0 1 243347 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{0}> show all locks Process 47835 (syz-executor) thread 0xffff80002a24c7e0 (260436) exclusive rrwlock inode r = 0 (0xfffff78075a497b8) #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 vn_write+0x18f sys/kern/vfs_vnops.c:411 #6 dofilewritev+0x2bd sys/kern/sys_generic.c:384 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #9 Xsyscall+0x128 Process 34535 (sshd) thread 0xffff80002a222010 (283632) exclusive rwlock amaplk r = 0 (0xfffff7806f8e3cd0) #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 amap_ref+0x3c sys/uvm/uvm_amap.c:1312 #3 uvm_mapent_clone+0x17e sys/uvm/uvm_map.c:3503 #4 uvm_mapent_forkcopy+0x6f sys/uvm/uvm_map.c:3573 #5 uvmspace_fork+0x299 sys/uvm/uvm_map.c:3776 #6 process_new+0x583 sys/kern/kern_fork.c:282 #7 fork1+0x3f6 sys/kern/kern_fork.c:-1 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #9 Xsyscall+0x128 exclusive rwlock vmmaplk r = 0 (0xfffff7806bde0128) #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 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5170 #3 uvmspace_fork+0x12b sys/uvm/uvm_map.c:3752 #4 process_new+0x583 sys/kern/kern_fork.c:282 #5 fork1+0x3f6 sys/kern/kern_fork.c:-1 #6 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #7 Xsyscall+0x128 exclusive rwlock vmmaplk r = 0 (0xfffff7800b1cb4d0) #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 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5170 #3 uvmspace_fork+0x44 sys/uvm/uvm_map.c:3743 #4 process_new+0x583 sys/kern/kern_fork.c:282 #5 fork1+0x3f6 sys/kern/kern_fork.c:-1 #6 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #7 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83ab4d00) #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 Process 28406 (systqmp) thread 0xffff800045ffea60 (412893) shared rwlock systqmp r = 0 (0xffffffff839c4108) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11049 12016K 12034K 166960K 12143 0 pcb 17 12K 12K 166960K 17 0 rtable 215 6K 7K 166960K 351 0 pf 29 16K 16K 166960K 31 0 ifaddr 38 6K 7K 166960K 44 0 ifgroup 46 2K 2K 166960K 50 0 sysctl 4 1K 9K 166960K 8 0 counters 68 36K 37K 166960K 70 0 ioctlops 0 0K 2K 166960K 34 0 iov 0 0K 8K 166960K 4 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1288 81K 81K 166960K 1425 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 4 0 VM map 2 1K 1K 166960K 2 0 sem 5 0K 0K 166960K 6 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 21 77K 125K 166960K 255 0 proc 58 99K 147K 166960K 511 0 subproc 63 3K 4K 166960K 135 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 18 0 in_multi 88 5K 6K 166960K 108 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 5 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 374 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 230 159K 185K 166960K 3731 0 UVM aobj 6 2K 4K 166960K 7 0 pinsyscall 44 88K 110K 166960K 1357 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 0K 166960K 8 0 NDP 10 0K 2K 166960K 27 0 temp 35 9119K 9183K 166960K 4008 0 kqueue 17 26K 30K 166960K 65 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 36 0 33 1 0 1 1 0 8 0 rtentry 176 112 0 13 6 0 6 6 0 8 1 unpcb 144 167 0 148 2 0 2 2 0 8 1 syncache 336 9 0 9 1 0 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 736 51 0 43 2 0 2 2 0 8 1 arp 136 18 0 2 1 0 1 1 0 8 0 inpcb 328 216 0 204 7 0 7 7 0 8 6 ip6q 72 1 0 0 1 0 1 1 0 8 0 ip6af 40 1 0 0 1 0 1 1 0 8 0 nd6 152 25 0 4 1 0 1 1 0 8 0 kcovpl 48 15 0 8 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 455 0 46 29 0 29 29 0 8 3 art_table 40 456 0 46 5 0 5 5 0 8 0 art_node 32 112 0 21 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 2 1 0 1 1 0 8 0 semapl 72 4 0 1 1 0 1 1 0 8 0 shmpl 112 4 0 1 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1691 0 219 93 0 93 93 0 8 0 ffsino 296 1691 0 219 114 0 114 114 0 8 0 nchpl 144 2015 0 314 64 0 64 64 0 8 0 vnodes 216 1835 0 0 102 0 102 102 0 8 0 namei 1024 6714 0 6714 2 0 2 2 0 8 2 percpumem 16 51 0 1 1 0 1 1 0 8 0 kstatmem 264 25 0 2 2 0 2 2 0 8 0 scxspl 216 7113 0 7113 10 2 8 8 1 8 8 plimitpl 152 100 0 77 2 0 2 2 0 8 1 sigapl 424 537 0 487 7 0 7 7 0 8 0 knotepl 120 511 0 0 16 0 16 16 0 8 0 kqueuepl 224 61 0 48 1 0 1 1 0 8 0 pipepl 344 156 0 128 3 0 3 3 0 8 0 fdescpl 528 521 0 487 4 0 4 4 0 8 0 filepl 160 2513 0 2299 13 0 13 13 0 8 3 lockfpl 104 44 0 41 1 0 1 1 0 8 0 lockfspl 48 16 0 13 1 0 1 1 0 8 0 sessionpl 144 40 0 24 1 0 1 1 0 8 0 pgrppl 48 58 0 35 1 0 1 1 0 8 0 ucredpl 104 254 0 236 1 0 1 1 0 8 0 zombiepl 144 488 0 487 1 0 1 1 0 8 0 processpl 1232 537 0 487 5 0 5 5 0 8 0 procpl 664 687 0 631 7 0 7 7 0 8 1 sockpl 752 419 0 384 11 0 11 11 0 8 7 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 108 0 0 14 0 14 14 0 8 0 mcl2k 2048 17 0 0 3 0 3 3 0 8 0 mextrefs 64 18 0 0 1 0 1 1 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 1192 0 0 75 0 75 75 0 8 0 bufpl 272 2384 0 102 153 0 153 153 0 8 0 anonpl 32 3721 0 0 30 0 30 30 0 247 0 amapchunkpl 152 10822 0 10322 30 0 30 30 0 158 6 amappl16 200 2043 0 2020 5 2 3 5 0 8 1 amappl15 192 10 0 10 1 1 0 1 0 8 0 amappl14 184 405 0 404 1 0 1 1 0 8 0 amappl13 176 122 0 112 1 0 1 1 0 8 0 amappl12 168 763 0 731 2 0 2 2 0 8 0 amappl11 160 2 0 2 1 1 0 1 0 8 0 amappl10 152 64 0 54 1 0 1 1 0 8 0 amappl9 144 280 0 280 1 1 0 1 0 8 0 amappl8 136 87 0 86 1 0 1 1 0 8 0 amappl7 128 157 0 146 1 0 1 1 0 8 0 amappl6 120 150 0 149 1 0 1 1 0 8 0 amappl5 112 98 0 91 1 0 1 1 0 8 0 amappl4 104 269 0 253 1 0 1 1 0 8 0 amappl3 96 1891 0 1796 4 1 3 3 0 8 0 amappl2 88 728 0 657 3 0 3 3 0 8 1 amappl1 80 11879 0 11322 18 0 18 18 0 8 2 amappl 88 3011 0 2844 5 0 5 5 0 92 0 uvmvnodes 80 101 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 6 0 1 1 0 1 1 0 8 0 uaddrrnd 24 521 0 487 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 521 0 487 1 0 1 1 0 8 0 vmmpekpl 168 6728 0 6687 3 0 3 3 0 8 0 vmmpepl 168 44658 0 42690 105 0 105 105 0 357 13 vmsppl 488 520 0 487 7 1 6 6 0 8 1 rwobjpl 80 16547 0 15629 26 0 26 26 0 8 2 pdppl 4096 1049 0 974 107 26 81 97 0 8 6 pvpl 32 12226 0 0 99 0 99 99 0 265 0 pmappl 256 520 0 487 4 1 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 493 0 29 14 0 14 14 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:438 panic(ffffffff83525295) at panic+0x1e5 sys/kern/subr_prf.c:198 amap_pp_adjref(fffff780777f1790,0,1,1) at amap_pp_adjref+0x74c sys/uvm/uvm_amap.c:880 amap_adjref_anons(fffff780777f1790,0,1,1,0) at amap_adjref_anons+0x22d sys/uvm/uvm_amap.c:1298 uvm_mapent_clone(fffff7806bde0028,c91fc250000,1000,0,1,7,61756f43285a9b73,fffff7806e3e8aa8,ffff80002a284058,fffff7806bde0028) at uvm_mapent_clone+0x17e sys/uvm/uvm_map.c:3503 uvm_mapent_forkcopy(1,fffff7806bde0028,fffff7800b1cb3d0,fffff7806e3e8aa8,ffff80002a284058) at uvm_mapent_forkcopy+0x6f sys/uvm/uvm_map.c:3573 uvmspace_fork(ffff800045ff3500) at uvmspace_fork+0x299 sys/uvm/uvm_map.c:3776 process_new(ffff800045fe2028,ffff800045ff3500,1) at process_new+0x583 sys/kern/kern_fork.c:282 fork1(ffff80002a222010,1,ffffffff811282c0,0,ffff80002a284230,0) at fork1+0x3f6 sys/kern/kern_fork.c:-1 syscall(ffff80002a2842e0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2842e0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ef3e0cf87f0, count: -11 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff80002999dff0) 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+0x54 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x54 sys/dev/kcov.c:153 __mp_lock(ffffffff83ab4500) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83ab4500) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 __mp_acquire_count(ffffffff83ab4500,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369 biowait(fffff7806244fde0) at biowait+0xc6 sys/kern/vfs_bio.c:1110 bwrite(fffff7806244fde0) at bwrite+0x359 sys/kern/vfs_bio.c:625 ffs_write(ffff800035bd2610) at ffs_write+0x810 sys/ufs/ffs/ffs_vnops.c:377 VOP_WRITE(fffff78076854b48,ffff800035bd27c8,7,fffff780097fd5b0) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffff7806cf56860,ffff800035bd27c8,0) at vn_write+0x1d3 sys/kern/vfs_vnops.c:414 dofilewritev(ffff80002a24c7e0,7,ffff800035bd27c8,0,ffff800035bd2880) at dofilewritev+0x2bd sys/kern/sys_generic.c:384 sys_write(ffff80002a24c7e0,ffff800035bd2930,ffff800035bd2880) at sys_write+0xa2 sys/kern/sys_generic.c:300 end trace frame: 0xffff800035bd2920, count: 0 ddb{1}> trace x86_ipi_db(ffff80002999dff0) 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+0x54 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x54 sys/dev/kcov.c:153 __mp_lock(ffffffff83ab4500) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83ab4500) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 __mp_acquire_count(ffffffff83ab4500,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369 biowait(fffff7806244fde0) at biowait+0xc6 sys/kern/vfs_bio.c:1110 bwrite(fffff7806244fde0) at bwrite+0x359 sys/kern/vfs_bio.c:625 ffs_write(ffff800035bd2610) at ffs_write+0x810 sys/ufs/ffs/ffs_vnops.c:377 VOP_WRITE(fffff78076854b48,ffff800035bd27c8,7,fffff780097fd5b0) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffff7806cf56860,ffff800035bd27c8,0) at vn_write+0x1d3 sys/kern/vfs_vnops.c:414 dofilewritev(ffff80002a24c7e0,7,ffff800035bd27c8,0,ffff800035bd2880) at dofilewritev+0x2bd sys/kern/sys_generic.c:384 sys_write(ffff80002a24c7e0,ffff800035bd2930,ffff800035bd2880) at sys_write+0xa2 sys/kern/sys_generic.c:300 syscall(ffff800035bd2930) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800035bd2930) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xeaeea1fe220, count: -16