witness: lock_object uninitialized: 0xffff800000dea028 Starting stack trace... witness_checkorder(ffff800000dea028,9,0) at witness_checkorder+0x133 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(ffff800000dea028,9,0) at witness_checkorder+0x133 sys/kern/subr_witness.c:772 rw_enter_write(ffff800000dea018) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 unveil_delete_names(ffff800000dea000) at unveil_delete_names+0x30 unvname_rbt_RBT_MIN sys/kern/kern_unveil.c:95 [inline] unveil_delete_names(ffff800000dea000) at unveil_delete_names+0x30 sys/kern/kern_unveil.c:105 unveil_destroy(ffff80002569a9b0) at unveil_destroy+0xad sys/kern/kern_unveil.c:186 exit1(ffff800021216540,0,0,3) at exit1+0x3d5 sys/kern/kern_exit.c:225 single_thread_check_locked(ffff800021216540,0,0) at single_thread_check_locked+0x227 sys/kern/kern_sig.c:1963 userret(ffff800021216540) at userret+0x27a single_thread_check sys/kern/kern_sig.c:2004 [inline] userret(ffff800021216540) at userret+0x27a sys/kern/kern_sig.c:1951 intr_user_exit() at intr_user_exit+0x3c end of kernel end trace frame: 0x7f7fffffb5a0, count: 249 End of stack trace. Stopped at db_enter+0x18: addq $0x8,%rsp ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 witness_checkorder(ffff800000dea028,9,0) at witness_checkorder+0x138 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(ffff800000dea028,9,0) at witness_checkorder+0x138 sys/kern/subr_witness.c:772 rw_enter_write(ffff800000dea018) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 unveil_delete_names(ffff800000dea000) at unveil_delete_names+0x30 unvname_rbt_RBT_MIN sys/kern/kern_unveil.c:95 [inline] unveil_delete_names(ffff800000dea000) at unveil_delete_names+0x30 sys/kern/kern_unveil.c:105 unveil_destroy(ffff80002569a9b0) at unveil_destroy+0xad sys/kern/kern_unveil.c:186 exit1(ffff800021216540,0,0,3) at exit1+0x3d5 sys/kern/kern_exit.c:225 single_thread_check_locked(ffff800021216540,0,0) at single_thread_check_locked+0x227 sys/kern/kern_sig.c:1963 userret(ffff800021216540) at userret+0x27a single_thread_check sys/kern/kern_sig.c:2004 [inline] userret(ffff800021216540) at userret+0x27a sys/kern/kern_sig.c:1951 intr_user_exit() at intr_user_exit+0x3c end of kernel end trace frame: 0x7f7fffffb5a0, count: -9 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff800025d23520 rbx 0x3 rdx 0 rcx 0 rax 0xffff800021216540 r8 0xffff800025d234c0 r9 0x8080808080808080 r10 0x83baae32daf10db r11 0x5d93430cf37f75b r12 0xffff800000dea001 r13 0xffff800000dea028 r14 0 r15 0 rip 0xffffffff81b3e348 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800025d23510 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=271720 stat=onproc flags process=1008 proc=82000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800021200a90,0xffff800021200d40 process=0xffff80002569a9b0 user=0xffff800025d1e000, vmspace=0xfffffd807efff2e0 estcpu=36, cpticks=14, pctcpu=0.0 user=0, sys=7, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 87438 44349 63090 0 2 0 syz-executor.3 18257 146914 99442 0 2 0 syz-executor.7 82109 149004 78414 0 2 0 syz-executor.4 82109 336512 78414 0 2 0x4000000 syz-executor.4 82109 447257 78414 0 2 0x4000000 syz-executor.4 96434 219951 15804 0 2 0x480 syz-executor.2 96434 207035 15804 0 3 0x4000080 lockf syz-executor.2 96434 499668 15804 0 3 0x4000080 fsleep syz-executor.2 96434 37834 15804 0 3 0x4000080 fsleep syz-executor.2 63090 284498 97730 0 2 0x482 syz-executor.3 99442 295958 97730 0 2 0x482 syz-executor.7 84072 74083 97730 0 2 0x482 syz-executor.1 78414 373135 97730 0 2 0x482 syz-executor.4 82372 373229 97730 0 2 0x482 syz-executor.0 2522 189315 0 0 3 0x14200 acct acct 54275 377811 1 0 3 0x100083 ttyin getty 93678 436813 0 0 3 0x14280 nfsidl nfsio 54706 204954 0 0 3 0x14280 nfsidl nfsio 88302 253489 0 0 3 0x14280 nfsidl nfsio 64651 265298 0 0 3 0x14280 nfsidl nfsio 22095 26158 0 0 3 0x14280 nfsidl nfsio 28732 294951 0 0 3 0x14280 nfsidl nfsio 79930 146898 0 0 3 0x14280 nfsidl nfsio 68696 271857 0 0 3 0x14280 nfsidl nfsio 2438 380451 0 0 3 0x14280 nfsidl nfsio 36717 111516 0 0 3 0x14280 nfsidl nfsio 90813 255225 0 0 3 0x14280 nfsidl nfsio 84685 203785 0 0 3 0x14280 nfsidl nfsio 91861 67536 0 0 3 0x14280 nfsidl nfsio 9697 421548 0 0 3 0x14280 nfsidl nfsio 46862 417031 0 0 3 0x14280 nfsidl nfsio 17766 98494 0 0 3 0x14280 nfsidl nfsio 94436 361497 0 0 3 0x14280 nfsidl nfsio 83649 46225 0 0 3 0x14280 nfsidl nfsio 55564 408031 0 0 3 0x14280 nfsidl nfsio 23342 384180 0 0 3 0x14280 nfsidl nfsio 15804 55878 97730 0 2 0x482 syz-executor.2 52563 437492 0 0 3 0x14200 bored sosplice 41799 373508 97730 0 2 0x2 syz-executor.6 33115 500594 97730 0 2 0x482 syz-executor.5 97730 499028 89169 0 3 0x82 thrsleep syz-fuzzer 97730 471621 89169 0 3 0x4000082 thrsleep syz-fuzzer 97730 337763 89169 0 3 0x4000082 thrsleep syz-fuzzer 97730 150824 89169 0 3 0x4000082 thrsleep syz-fuzzer 97730 264489 89169 0 3 0x4000082 thrsleep syz-fuzzer 97730 26704 89169 0 3 0x4000082 thrsleep syz-fuzzer 97730 38268 89169 0 3 0x4000082 kqread syz-fuzzer 97730 7698 89169 0 3 0x4000082 thrsleep syz-fuzzer 97730 409207 89169 0 3 0x4000082 thrsleep syz-fuzzer 89169 366391 13077 0 3 0x10008a sigsusp ksh 13077 198748 91472 0 3 0x9a kqread sshd 91472 229167 1 0 3 0x88 kqread sshd 62315 299314 98535 74 3 0x1100092 bpf pflogd 98535 519932 1 0 3 0x80 netio pflogd 24342 43975 95579 73 2 0x1100090 syslogd 95579 456110 1 0 3 0x100082 netio syslogd 71510 278792 1 0 3 0x100080 kqread resolvd 49598 15417 8771 77 3 0x100092 kqread dhcpleased 72749 322827 8771 77 3 0x100092 kqread dhcpleased 8771 145548 1 0 3 0x80 kqread dhcpleased 52922 482966 0 0 3 0x14200 bored smr 34884 253595 0 0 2 0x14200 zerothread 32341 213207 0 0 3 0x14200 aiodoned aiodoned 67670 350341 0 0 3 0x14200 syncer update 32279 77897 0 0 3 0x14200 cleaner cleaner 82125 440772 0 0 3 0x14200 reaper reaper 51579 289147 0 0 3 0x14200 pgdaemon pagedaemon 30290 331919 0 0 3 0x14200 bored viomb 55933 327719 0 0 3 0x40014200 acpi0 acpi0 3238 142270 0 0 7 0x40014200 idle1 22110 261123 0 0 3 0x14200 bored softnet 66328 336122 0 0 3 0x14200 bored systqmp 68120 313959 0 0 3 0x14200 bored systq 52180 380225 0 0 3 0x40014200 bored softclock 60566 367029 0 0 3 0x40014200 idle0 1 43464 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 87438 (syz-executor.3) thread 0xffff800021201510 (44349) exclusive rwlock vmmaplk r = 0 (0xfffffd8077881028) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 vm_map_lock_ln+0xda sys/uvm/uvm_map.c:5458 #3 uvmfault_lookup+0xb9 sys/uvm/uvm_fault.c:1752 #4 uvm_fault_check+0x603 uvmfault_amapcopy sys/uvm/uvm_fault.c:236 [inline] #4 uvm_fault_check+0x603 sys/uvm/uvm_fault.c:712 #5 uvm_fault+0x102 sys/uvm/uvm_fault.c:602 #6 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #7 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403 #8 recall_trap+0x8 Process 18257 (syz-executor.7) thread 0xffff8000212017b0 (146914) exclusive rwlock vmmaplk r = 0 (0xfffffd8077881e88) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 vm_map_lock_ln+0xda sys/uvm/uvm_map.c:5458 #3 uvmfault_lookup+0xb9 sys/uvm/uvm_fault.c:1752 #4 uvm_fault_check+0x603 uvmfault_amapcopy sys/uvm/uvm_fault.c:236 [inline] #4 uvm_fault_check+0x603 sys/uvm/uvm_fault.c:712 #5 uvm_fault+0x102 sys/uvm/uvm_fault.c:602 #6 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #7 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403 #8 recall_trap+0x8 Process 41799 (syz-executor.6) thread 0xffff80002121d7a8 (373508) exclusive rrwlock inode r = 0 (0xfffffd806d40d928) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 ufs_ihashins+0x42 sys/ufs/ufs/ufs_ihash.c:140 #5 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1347 #6 ffs_inode_alloc+0x1be sys/ufs/ffs/ffs_alloc.c:394 #7 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1162 #8 VOP_MKDIR+0xbf sys/kern/vfs_vops.c:404 #9 domkdirat+0x121 sys/kern/vfs_syscalls.c:3101 #10 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #10 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd80699a9b40) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vfs_lookup+0xd1 sys/kern/vfs_lookup.c:413 #6 namei+0x36a sys/kern/vfs_lookup.c:245 #7 domkdirat+0x75 sys/kern/vfs_syscalls.c:3086 #8 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10216 6495K 7053K 78643K 24421 0 pcb 13 14K 16K 78643K 614 0 rtable 261 23K 23K 78643K 2229 0 ifaddr 96 21K 22K 78643K 1003 0 sysctl 3 1K 1K 78643K 3 0 counters 56 35K 36K 78643K 250 0 ioctlops 0 0K 4K 78643K 6930 0 iov 0 0K 40K 78643K 12754 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1334 83K 83K 78643K 6074 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 13K 78643K 108 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 1256 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 14 49K 89K 78643K 15988 0 sigio 0 0K 0K 78643K 48 0 proc 78 111K 123K 78643K 2930 0 subproc 104 6K 6K 78643K 429 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 409 0 in_multi 100 6K 7K 78643K 574 0 ether_multi 1 0K 0K 78643K 85 0 mrt 1 0K 0K 78643K 82 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 253 1129K 1129K 78643K 253 0 exec 0 0K 2K 78643K 2137 0 pfkey data 0 0K 0K 78643K 2 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 7 26K 26K 78643K 7 0 UVM amap 510 478K 479K 78643K 194924 0 UVM aobj 131 9K 9K 78643K 149 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 430 0 NDP 12 0K 2K 78643K 179 0 temp 143 4733K 4805K 78643K 86841 0 kqueue 12 18K 28K 78643K 1137 0 SYN cache 2 16K 24K 78643K 4 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 120 332 0 329 1 0 1 1 0 8 0 rtentry 112 449 0 347 4 0 4 4 0 8 0 unpcb 136 13883 0 13864 116 108 8 14 0 8 7 syncache 296 58 0 58 9 9 0 1 0 8 0 tcpqe 32 363 0 363 6 6 0 1 0 8 0 tcpcb 736 1665 0 1661 32 31 1 7 0 8 0 arp 120 73 0 55 1 0 1 1 0 8 0 inpcb 304 9882 0 9872 100 96 4 11 0 8 3 rttmr 72 23 0 23 6 6 0 1 0 8 0 nd6 48 103 0 79 1 0 1 1 0 8 0 pkpcb 40 14 0 14 5 5 0 1 0 8 0 kcovpl 48 33 0 25 1 0 1 1 0 8 0 ppxss 1248 39 0 39 7 7 0 1 0 8 0 pfstscr 40 25 0 25 5 5 0 1 0 8 0 pffrag 232 31 0 31 2 2 0 1 0 482 0 pffrnode 88 31 0 31 2 2 0 1 0 8 0 pffrent 40 62 0 62 2 2 0 1 0 8 0 pfosfp 40 1430 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1430 0 714 21 0 21 21 0 8 0 pfrktable 1344 330 0 315 6 4 2 2 0 8 0 pftag 88 92 0 86 1 0 1 1 0 8 0 pfqueue 264 7 0 7 2 2 0 1 0 8 0 pfstitem 24 23 0 21 1 0 1 1 0 8 0 pfstkey 112 49 0 47 1 0 1 1 0 8 0 pfstate 320 33 0 31 2 1 1 2 0 8 0 pfrule 1360 771 0 542 26 6 20 20 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 2375 0 1955 48 21 27 29 0 8 0 art_table 32 2376 0 1955 4 0 4 4 0 8 0 art_node 16 448 0 359 1 0 1 1 0 8 0 sysvmsgpl 40 74 0 45 1 0 1 1 0 8 0 semupl 112 4 0 4 1 1 0 1 0 8 0 semapl 112 1245 0 1235 1 0 1 1 0 8 0 shmpl 112 146 0 18 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 23947 0 22469 93 0 93 93 0 8 0 ffsino 272 23947 0 22469 99 0 99 99 0 8 0 nchpl 144 47537 0 45904 63 0 63 63 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 224 5926 0 0 349 0 349 349 0 8 0 namei 1024 155124 0 155123 17 16 1 3 0 8 0 percpumem 16 137 0 97 1 0 1 1 0 8 0 vcpupl 2048 31 0 0 4 0 4 4 0 8 0 vmpool 560 50 0 19 4 1 3 3 0 8 0 pfiaddrpl 120 264 0 76 8 2 6 6 0 8 0 scsiplug 72 10 0 10 4 4 0 1 0 8 0 scxspl 216 132794 0 132794 27 26 1 8 0 8 1 plimitpl 152 602 0 587 1 0 1 1 0 8 0 sigapl 424 16267 0 16201 8 0 8 8 0 8 0 futexpl 64 124980 0 124978 1 0 1 1 0 8 0 knotepl 120 401 0 0 10 1 9 10 0 8 0 kqueuepl 216 2042 0 2034 17 16 1 5 0 8 0 pipepl 336 1099 0 1071 20 17 3 8 0 8 0 fdescpl 496 16231 0 16204 5 0 5 5 0 8 0 filepl 152 87016 0 86769 161 144 17 29 0 8 7 lockfpl 104 5187 0 5183 7 6 1 2 0 8 0 lockfspl 48 2081 0 2078 1 0 1 1 0 8 0 sessionpl 144 51 0 34 1 0 1 1 0 8 0 pgrppl 48 152 0 135 1 0 1 1 0 8 0 ucredpl 96 6480 0 6465 1 0 1 1 0 8 0 zombiepl 144 17690 0 17687 16 15 1 1 0 8 0 processpl 1064 16267 0 16201 5 0 5 5 0 8 0 procpl 672 38113 0 38034 18 10 8 9 0 8 0 srpgc 96 36 0 36 6 6 0 1 0 8 0 sosppl 168 60 0 60 9 9 0 1 0 8 0 sockpl 480 24123 0 24090 601 589 12 66 0 8 7 mcl64k 65536 18 0 0 3 0 3 3 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 6 0 0 1 0 1 1 0 8 0 mcl9k 9216 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 15 0 0 2 0 2 2 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 514 0 0 20 2 18 20 0 8 0 mtagpl 96 712 0 0 14 0 14 14 0 8 0 mbufpl 256 1533 0 0 78 0 78 78 0 8 0 bufpl 288 28629 0 22293 453 0 453 453 0 8 0 anonpl 24 4425776 0 4409739 292 189 103 144 0 186 0 amapchunkpl 152 463924 0 463009 86 48 38 42 0 158 0 amappl16 200 47054 0 46744 176 156 20 41 0 8 0 amappl15 192 164 0 157 1 0 1 1 0 8 0 amappl14 184 1921 0 1917 1 0 1 1 0 8 0 amappl13 176 4908 0 4901 1 0 1 1 0 8 0 amappl12 168 1799 0 1795 2 1 1 1 0 8 0 amappl11 160 4156 0 4139 1 0 1 1 0 8 0 amappl10 152 662 0 653 1 0 1 1 0 8 0 amappl9 144 2365 0 2360 1 0 1 1 0 8 0 amappl8 136 1988 0 1798 7 0 7 7 0 8 0 amappl7 128 719 0 707 1 0 1 1 0 8 0 amappl6 120 2368 0 2338 2 1 1 2 0 8 0 amappl5 112 12713 0 12697 1 0 1 1 0 8 0 amappl4 104 5912 0 5883 1 0 1 1 0 8 0 amappl3 96 5108 0 5091 1 0 1 1 0 8 0 amappl2 88 7637 0 7573 3 1 2 3 0 8 0 amappl1 80 282937 0 282363 19 5 14 19 0 8 0 amappl 88 193751 0 193475 11 4 7 8 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 72 148 0 18 3 0 3 3 0 8 0 uaddrrnd 24 16281 0 16222 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 16281 0 16222 1 0 1 1 0 8 0 vmmpekpl 168 102709 0 102646 4 0 4 4 0 8 0 vmmpepl 168 1432042 0 1429653 242 127 115 132 0 357 0 vmsppl 368 16280 0 16222 6 0 6 6 0 8 0 rwobjpl 56 341269 0 333759 125 17 108 113 0 8 0 pdppl 4096 32569 0 32475 418 318 100 100 0 8 6 pvpl 32 7597550 0 7580071 449 298 151 246 0 265 0 pmappl 248 16280 0 16222 4 0 4 4 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 1330 0 413 27 0 27 27 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:440 witness_checkorder(ffff800000dea028,9,0) at witness_checkorder+0x138 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(ffff800000dea028,9,0) at witness_checkorder+0x138 sys/kern/subr_witness.c:772 rw_enter_write(ffff800000dea018) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 unveil_delete_names(ffff800000dea000) at unveil_delete_names+0x30 unvname_rbt_RBT_MIN sys/kern/kern_unveil.c:95 [inline] unveil_delete_names(ffff800000dea000) at unveil_delete_names+0x30 sys/kern/kern_unveil.c:105 unveil_destroy(ffff80002569a9b0) at unveil_destroy+0xad sys/kern/kern_unveil.c:186 exit1(ffff800021216540,0,0,3) at exit1+0x3d5 sys/kern/kern_exit.c:225 single_thread_check_locked(ffff800021216540,0,0) at single_thread_check_locked+0x227 sys/kern/kern_sig.c:1963 userret(ffff800021216540) at userret+0x27a single_thread_check sys/kern/kern_sig.c:2004 [inline] userret(ffff800021216540) at userret+0x27a sys/kern/kern_sig.c:1951 intr_user_exit() at intr_user_exit+0x3c end of kernel end trace frame: 0x7f7fffffb5a0, count: -9 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp