login: panic: kernel diagnostic assertion "uvn->u_obj.uo_refs == 0" failed: file "/syzkaller/managers/setuid/kernel/sys/uvm/uvm_vnode.c", line 235 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 25850 7756 32767 0x10 0 1 syz-executor.2 * 84545 7756 32767 0x10 0x4000000 0K syz-executor.2 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff825a55e6) at panic+0x177 sys/kern/subr_prf.c:198 __assert(ffffffff8261b443,ffffffff8263e6a2,eb,ffffffff82637043) at __assert+0x25 sys/kern/subr_prf.c:157 uvn_attach(fffffd8068731948,6) at uvn_attach+0x454 sys/uvm/uvm_vnode.c:235 uvm_mmapfile(fffffd8068664e78,ffff8000293ca3b8,10000,2,6,11,cb049caa53c5da18,fffffd8068664e78,0,11) at uvm_mmapfile+0x194 sys/uvm/uvm_mmap.c:1029 sys_mmap(ffff8000212f4fd0,ffff8000293ca460,ffff8000293ca530) at sys_mmap+0xb4a sys/uvm/uvm_mmap.c:395 sys_pad_mmap(ffff8000212f4fd0,ffff8000293ca4e8,ffff8000293ca530) at sys_pad_mmap+0x68 sys/uvm/uvm_mmap.c:470 syscall(ffff8000293ca5b0) at syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff8000293ca5b0) at syscall+0x435 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xebc27e7c5f0, 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: kernel diagnostic assertion "uvn->u_obj.uo_refs == 0" failed: file "/syzkaller/managers/setuid/kernel/sys/uvm/uvm_vnode.c", line 235 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff825a55e6) at panic+0x177 sys/kern/subr_prf.c:198 __assert(ffffffff8261b443,ffffffff8263e6a2,eb,ffffffff82637043) at __assert+0x25 sys/kern/subr_prf.c:157 uvn_attach(fffffd8068731948,6) at uvn_attach+0x454 sys/uvm/uvm_vnode.c:235 uvm_mmapfile(fffffd8068664e78,ffff8000293ca3b8,10000,2,6,11,cb049caa53c5da18,fffffd8068664e78,0,11) at uvm_mmapfile+0x194 sys/uvm/uvm_mmap.c:1029 sys_mmap(ffff8000212f4fd0,ffff8000293ca460,ffff8000293ca530) at sys_mmap+0xb4a sys/uvm/uvm_mmap.c:395 sys_pad_mmap(ffff8000212f4fd0,ffff8000293ca4e8,ffff8000293ca530) at sys_pad_mmap+0x68 sys/uvm/uvm_mmap.c:470 syscall(ffff8000293ca5b0) at syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff8000293ca5b0) at syscall+0x435 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xebc27e7c5f0, count: -9 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff8000293ca050 rbx 0xffffffff8296db8f cpu_info_full_primary+0x2b8f rdx 0 rcx 0 rax 0xffff8000212f4fd0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xa55332d288dd13a9 r11 0x47b42c0bc4a54729 r12 0xffffffff8296d990 cpu_info_full_primary+0x2990 r13 0 r14 0 r15 0x1 rip 0xffffffff8228a448 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000293ca040 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.2) pid=84545 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=81, nice=20 forw=0xffffffffffffffff, list=0xffff8000212f4550,0xffffffff82a01730 process=0xffff8000ffff3620 user=0xffff8000293c5000, vmspace=0xfffffd8068664e78 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 7756 25850 83298 32767 7 0x10 syz-executor.2 7756 124382 83298 32767 2 0x4000010 syz-executor.2 * 7756 84545 83298 32767 7 0x4000010 syz-executor.2 10264 365493 11105 32767 2 0x10 syz-executor.3 10264 122052 11105 32767 3 0x4000090 fsleep syz-executor.3 10264 143210 11105 32767 3 0x4000090 fsleep syz-executor.3 10264 67668 11105 32767 2 0x4000010 syz-executor.3 62844 159735 14285 32767 2 0x10 syz-executor.5 62844 475490 14285 32767 3 0x4000090 fsleep syz-executor.5 62844 374809 14285 32767 3 0x4000090 fsleep syz-executor.5 11765 58836 10136 32767 2 0x10 syz-executor.6 11765 424649 10136 32767 3 0x4000090 fsleep syz-executor.6 11765 154760 10136 32767 3 0x4000090 fsleep syz-executor.6 11765 330360 10136 32767 3 0x4000090 fsleep syz-executor.6 66169 361848 52240 32767 2 0x10 syz-executor.0 10209 222696 0 0 3 0x14200 bored sosplice 25748 144348 52669 32767 2 0x10 syz-executor.7 10136 219645 65499 32767 3 0x90 nanoslp syz-executor.6 65499 188830 99006 0 3 0x82 wait syz-executor.6 52669 413221 99006 0 3 0x82 wait syz-executor.7 14285 57708 34629 32767 2 0x490 syz-executor.5 34629 522066 99006 0 3 0x82 wait syz-executor.5 87745 345102 23517 32767 2 0x10 syz-executor.4 83298 158390 27442 32767 3 0x90 nanoslp syz-executor.2 48984 364791 32409 32767 2 0x10 syz-executor.1 11105 301574 14174 32767 2 0x490 syz-executor.3 23517 473035 99006 0 3 0x82 wait syz-executor.4 14174 407286 99006 0 3 0x82 wait syz-executor.3 27442 64434 99006 0 3 0x82 wait syz-executor.2 52240 367126 7037 32767 2 0x10 syz-executor.0 32409 313676 99006 0 3 0x82 wait syz-executor.1 7037 439564 99006 0 3 0x82 wait syz-executor.0 99006 367599 24341 0 3 0x82 wait syz-fuzzer 99006 140661 24341 0 2 0x4000482 syz-fuzzer 99006 431454 24341 0 3 0x4000082 thrsleep syz-fuzzer 99006 310765 24341 0 3 0x4000082 wait syz-fuzzer 99006 149500 24341 0 3 0x4000082 wait syz-fuzzer 99006 276463 24341 0 3 0x4000082 wait syz-fuzzer 99006 383258 24341 0 3 0x4000082 wait syz-fuzzer 99006 442565 24341 0 3 0x4000082 thrsleep syz-fuzzer 99006 349982 24341 0 3 0x4000082 thrsleep syz-fuzzer 99006 476787 24341 0 3 0x4000082 wait syz-fuzzer 99006 73372 24341 0 3 0x4000082 wait syz-fuzzer 99006 151077 24341 0 3 0x4000082 wait syz-fuzzer 99006 513484 24341 0 3 0x4000082 thrsleep syz-fuzzer 99006 248645 24341 0 3 0x4000082 thrsleep syz-fuzzer 99006 392595 24341 0 3 0x4000082 thrsleep syz-fuzzer 99006 43075 24341 0 3 0x4000082 kqread syz-fuzzer 24341 233793 79302 0 3 0x10008a sigsusp ksh 79302 304327 32719 0 3 0x9a kqread sshd 7156 341560 1 0 3 0x100083 ttyin getty 32719 386565 1 0 3 0x88 kqread sshd 13505 305850 19895 73 3 0x1100090 kqread syslogd 19895 154686 1 0 3 0x100082 netio syslogd 60487 295487 1 0 3 0x100080 kqread resolvd 27142 443802 7317 77 3 0x100092 kqread dhcpleased 47500 235370 7317 77 3 0x100092 kqread dhcpleased 7317 93886 1 0 3 0x80 kqread dhcpleased 42257 100344 0 0 3 0x14200 bored smr 50885 81714 0 0 2 0x14200 zerothread 82431 209428 0 0 3 0x14200 aiodoned aiodoned 26395 360046 0 0 3 0x14200 syncer update 64301 45477 0 0 3 0x14200 cleaner cleaner 66932 61338 0 0 3 0x14200 reaper reaper 89672 76172 0 0 3 0x14200 pgdaemon pagedaemon 30191 233734 0 0 3 0x14200 bored viomb 77710 454884 0 0 3 0x40014200 acpi0 acpi0 14023 328279 0 0 3 0x40014200 idle1 64336 15827 0 0 3 0x14200 bored softnet 11589 148169 0 0 3 0x14200 bored softnet 3720 375322 0 0 3 0x14200 bored softnet 32666 487488 0 0 3 0x14200 bored softnet 88095 276248 0 0 3 0x14200 bored systqmp 11938 501463 0 0 3 0x14200 bored systq 14930 492185 0 0 2 0x40014200 softclock 7743 229507 0 0 3 0x40014200 idle0 1 16308 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 7756 (syz-executor.2) thread 0xffff8000212f4d30 (25850) exclusive rwlock uobjlk r = 0 (0xfffffd8067de0e48) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 uvm_fault_lower+0x951 sys/uvm/uvm_fault.c:1324 #3 uvm_fault+0x238 #4 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #5 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403 #6 recall_trap+0x8 Process 7756 (syz-executor.2) thread 0xffff8000212f4fd0 (84545) exclusive kernel_lock &kernel_lock r = 1 (0xffffffff82ba5240) #0 witness_lock+0x44d #1 syscall+0x41d mi_syscall sys/sys/syscall_mi.h:100 [inline] #1 syscall+0x41d sys/arch/amd64/amd64/trap.c:585 #2 Xsyscall+0x128 Process 25748 (syz-executor.7) thread 0xffff8000fffeea80 (144348) exclusive rrwlock inode r = 0 (0xfffffd8067bb5b40) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:465 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:518 #4 ufs_ihashins+0x42 sys/ufs/ufs/ufs_ihash.c:140 #5 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1353 #6 ffs_inode_alloc+0x1be sys/ufs/ffs/ffs_alloc.c:394 #7 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1150 #8 VOP_MKDIR+0xbf sys/kern/vfs_vops.c:388 #9 domkdirat+0x121 sys/kern/vfs_syscalls.c:3112 #10 syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline] #10 syscall+0x435 sys/arch/amd64/amd64/trap.c:585 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8067bb55f0) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:465 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:564 #5 vfs_lookup+0xd1 sys/kern/vfs_lookup.c:412 #6 namei+0x36a sys/kern/vfs_lookup.c:244 #7 domkdirat+0x75 sys/kern/vfs_syscalls.c:3097 #8 syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline] #8 syscall+0x435 sys/arch/amd64/amd64/trap.c:585 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10215 6412K 6420K 78643K 11307 0 pcb 13 10K 12K 78643K 15 0 rtable 242 6K 7K 78643K 580 0 ifaddr 82 16K 16K 78643K 84 0 sysctl 2 0K 1K 78643K 6 0 counters 56 35K 35K 78643K 56 0 ioctlops 0 0K 2K 78643K 89 0 iov 0 0K 20K 78643K 1683 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1271 79K 79K 78643K 2184 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 55 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 180 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 23 85K 113K 78643K 4872 0 sigio 0 0K 0K 78643K 97 0 proc 59 91K 115K 78643K 721 0 subproc 104 6K 6K 78643K 104 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 279 0 in_multi 99 6K 7K 78643K 129 0 ether_multi 1 0K 0K 78643K 10 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 235 1049K 1049K 78643K 235 0 exec 0 0K 2K 78643K 1300 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 330 102K 104K 78643K 30899 0 UVM aobj 111 3K 3K 78643K 111 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 158 0 NDP 11 0K 2K 78643K 27 0 temp 124 4734K 4798K 78643K 14411 0 kqueue 12 18K 28K 78643K 401 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 120 475 0 472 8 7 1 3 0 8 0 rtentry 112 118 0 4 4 0 4 4 0 8 0 unpcb 144 5693 0 5676 53 42 11 11 0 8 10 syncache 296 78 0 78 14 14 0 1 0 8 0 tcpqe 32 76 0 76 9 9 0 1 0 8 0 tcpcb 768 5822 0 5811 106 97 9 24 0 8 7 arp 120 19 0 1 1 0 1 1 0 8 0 ipq 40 6 0 5 4 3 1 1 0 8 0 ipqe 40 25 0 21 4 3 1 1 0 8 0 inpcb 368 7544 0 7534 68 58 10 14 0 8 8 nd6 48 30 0 2 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 465 0 5 29 0 29 29 0 8 0 art_table 32 466 0 5 4 0 4 4 0 8 0 art_node 16 117 0 13 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 3 1 1 0 1 0 8 0 semupl 112 4 0 4 1 1 0 1 0 8 0 semapl 112 173 0 163 1 0 1 1 0 8 0 shmpl 112 108 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 7803 0 6361 91 0 91 91 0 8 0 ffsino 272 7803 0 6361 97 0 97 97 0 8 0 nchpl 144 14256 0 12584 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 48894 0 48893 2 1 1 2 0 8 0 percpumem 16 40 0 0 1 0 1 1 0 8 0 kstatmem 264 22 0 0 2 0 2 2 0 8 0 scxspl 216 39888 0 39888 22 21 1 8 0 8 1 plimitpl 152 829 0 806 10 8 2 2 0 8 1 sigapl 424 5158 0 5106 8 1 7 7 0 8 0 futexpl 64 51682 0 51675 1 0 1 1 0 8 0 knotepl 120 390 0 0 9 0 9 9 0 8 0 kqueuepl 216 1321 0 1313 21 20 1 5 0 8 0 pipepl 320 1235 0 1207 30 27 3 11 0 8 0 fdescpl 496 5140 0 5106 6 1 5 6 0 8 0 filepl 152 38208 0 37904 66 46 20 20 0 8 8 lockfpl 104 811 0 808 2 1 1 2 0 8 0 lockfspl 48 205 0 202 1 0 1 1 0 8 0 sessionpl 144 23 0 7 1 0 1 1 0 8 0 pgrppl 48 59 0 43 1 0 1 1 0 8 0 ucredpl 104 6280 0 6262 1 0 1 1 0 8 0 zombiepl 144 5106 0 5106 1 0 1 1 0 8 1 processpl 1064 5158 0 5106 4 0 4 4 0 8 0 procpl 672 14735 0 14658 18 10 8 9 0 8 0 sosppl 168 69 0 69 8 7 1 1 0 8 1 sockpl 488 13943 0 13913 202 165 37 37 0 8 31 mcl64k 65536 25 0 0 3 0 3 3 0 8 0 mcl16k 16384 20 0 0 3 1 2 3 0 8 0 mcl12k 12288 25 0 0 2 0 2 2 0 8 0 mcl9k 9216 15 0 0 2 0 2 2 0 8 0 mcl8k 8192 25 0 0 3 0 3 3 0 8 0 mcl4k 4096 25 0 0 4 0 4 4 0 8 0 mcl2k2 2112 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 310 0 0 36 1 35 36 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 1229 0 0 69 0 69 69 0 8 0 bufpl 288 11038 0 4710 453 0 453 453 0 8 0 anonpl 24 1766727 0 1753100 261 128 133 141 0 186 19 amapchunkpl 152 90474 0 89546 61 18 43 43 0 158 7 amappl16 200 59820 0 59485 412 385 27 49 0 8 8 amappl15 192 1372 0 1359 2 1 1 2 0 8 0 amappl14 184 703 0 697 1 0 1 1 0 8 0 amappl13 176 652 0 648 1 0 1 1 0 8 0 amappl12 168 633 0 629 2 1 1 1 0 8 0 amappl11 160 582 0 568 1 0 1 1 0 8 0 amappl10 152 37 0 34 1 0 1 1 0 8 0 amappl9 144 995 0 987 1 0 1 1 0 8 0 amappl8 136 2574 0 2463 5 1 4 4 0 8 0 amappl7 128 1926 0 1901 1 0 1 1 0 8 0 amappl6 120 311 0 290 2 1 1 2 0 8 0 amappl5 112 3110 0 3093 1 0 1 1 0 8 0 amappl4 104 2661 0 2632 2 1 1 2 0 8 0 amappl3 96 16424 0 16362 2 0 2 2 0 8 0 amappl2 88 6557 0 6484 3 1 2 3 0 8 0 amappl1 80 125217 0 124436 22 4 18 21 0 8 0 amappl 88 30195 0 29996 6 1 5 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 72 110 0 0 2 0 2 2 0 8 0 uaddrrnd 24 5140 0 5106 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 5140 0 5106 1 0 1 1 0 8 0 vmmpekpl 168 45595 0 45541 3 0 3 3 0 8 0 vmmpepl 168 552463 0 549556 264 108 156 160 0 357 17 vmsppl 368 5139 0 5106 4 0 4 4 0 8 0 rwobjpl 56 177942 0 170411 127 13 114 115 0 8 2 pdppl 4096 10287 0 10212 188 107 81 89 0 8 6 pvpl 32 2741361 0 2721579 403 170 233 269 0 265 31 pmappl 248 5139 0 5106 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1057 0 170 26 0 26 26 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff825a55e6) at panic+0x177 sys/kern/subr_prf.c:198 __assert(ffffffff8261b443,ffffffff8263e6a2,eb,ffffffff82637043) at __assert+0x25 sys/kern/subr_prf.c:157 uvn_attach(fffffd8068731948,6) at uvn_attach+0x454 sys/uvm/uvm_vnode.c:235 uvm_mmapfile(fffffd8068664e78,ffff8000293ca3b8,10000,2,6,11,cb049caa53c5da18,fffffd8068664e78,0,11) at uvm_mmapfile+0x194 sys/uvm/uvm_mmap.c:1029 sys_mmap(ffff8000212f4fd0,ffff8000293ca460,ffff8000293ca530) at sys_mmap+0xb4a sys/uvm/uvm_mmap.c:395 sys_pad_mmap(ffff8000212f4fd0,ffff8000293ca4e8,ffff8000293ca530) at sys_pad_mmap+0x68 sys/uvm/uvm_mmap.c:470 syscall(ffff8000293ca5b0) at syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff8000293ca5b0) at syscall+0x435 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xebc27e7c5f0, count: -9 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020dd8ff0) at x86_ipi_db+0x1a 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+0x23 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xb sys/dev/kcov.c:144 syscall(ffff80002e4885a0) at syscall+0x41d mi_syscall sys/sys/syscall_mi.h:100 [inline] syscall(ffff80002e4885a0) at syscall+0x41d sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc2a10, count: 9 ddb{1}> trace x86_ipi_db(ffff800020dd8ff0) at x86_ipi_db+0x1a 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+0x23 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xb sys/dev/kcov.c:144 syscall(ffff80002e4885a0) at syscall+0x41d mi_syscall sys/sys/syscall_mi.h:100 [inline] syscall(ffff80002e4885a0) at syscall+0x41d sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc2a10, count: -6