login: kernel: protection fault trap, code=0 Stopped at done_flush+0x38: movl %eax,%dr6 ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace end trace frame: 0x0, count: -1 ddb{1}> show registers rdi 0x6c14 __ALIGN_SIZE+0x5c14 rsi 0xffff80002f791d18 rbp 0 rbx 0x756e6547 rdx 0x49656e69 rcx 0x6c65746e rax 0x100000001 r8 0 r9 0x10000 __ALIGN_SIZE+0xf000 r10 0 r11 0 r12 0 r13 0 r14 0 r15 0 rip 0xffffffff81f1820b done_flush+0x38 cs 0x8 rflags 0x10046 __ALIGN_SIZE+0xf046 rsp 0xffff80002a27bdb8 ss 0x10 done_flush+0x38: movl %eax,%dr6 ddb{1}> show proc PROC (syz-executor) tid=383681 pid=1937 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=84, usrpri=84, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c3fa800,0xffff80003c3fad40 process=0xffff80003c3e5830 user=0xffff80002a277000, vmspace=0xfffffd806c9085d0 estcpu=34, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 55980 429754 23024 0 7 0 syz-executor 1937 169167 43795 0 2 0 syz-executor 1937 505412 43795 0 3 0x4000080 sbwait syz-executor * 1937 383681 43795 0 7 0x4000000 syz-executor 20513 323448 88112 0 3 0x80 nanoslp syz-executor 20513 192056 88112 0 3 0x4000080 ttyin syz-executor 20513 3746 88112 0 3 0x4000080 fsleep syz-executor 46156 453754 83704 60928 3 0x90 nanoslp syz-executor 46156 210202 83704 60928 3 0x4000090 sbwait syz-executor 46156 99218 83704 60928 3 0x4000090 fsleep syz-executor 57838 471595 1 0 3 0x100083 ttyin getty 45192 457807 20282 0 2 0x2 syz-executor 84637 157557 20282 0 3 0x82 nanoslp syz-executor 88112 173505 20282 0 3 0x82 nanoslp syz-executor 23024 204334 20282 0 3 0x82 nanoslp syz-executor 82800 321979 0 0 3 0x14280 nfsidl nfsio 96052 3639 0 0 3 0x14280 nfsidl nfsio 14104 456916 0 0 3 0x14280 nfsidl nfsio 88396 149881 0 0 3 0x14280 nfsidl nfsio 49978 430810 0 0 3 0x14280 nfsidl nfsio 83851 105299 0 0 3 0x14280 nfsidl nfsio 90848 251560 0 0 3 0x14280 nfsidl nfsio 9383 394419 0 0 3 0x14280 nfsidl nfsio 79601 191283 0 0 3 0x14280 nfsidl nfsio 48656 263261 0 0 3 0x14280 nfsidl nfsio 8153 338973 0 0 3 0x14280 nfsidl nfsio 30181 27901 0 0 3 0x14280 nfsidl nfsio 28006 271874 0 0 3 0x14280 nfsidl nfsio 95416 349514 0 0 3 0x14280 nfsidl nfsio 93481 22375 0 0 3 0x14280 nfsidl nfsio 51065 87400 0 0 3 0x14280 nfsidl nfsio 39167 475830 0 0 3 0x14280 nfsidl nfsio 39325 24512 0 0 3 0x14280 nfsidl nfsio 95465 168439 0 0 3 0x14280 nfsidl nfsio 83433 345016 0 0 3 0x14280 nfsidl nfsio 83242 245495 20282 0 2 0x2 syz-executor 69061 33979 20282 0 3 0x82 wait syz-executor 43795 462919 20282 0 3 0x82 nanoslp syz-executor 83704 208803 20282 0 3 0x82 nanoslp syz-executor 20282 338099 53730 0 3 0x82 kqread syz-executor 53730 413705 335 0 3 0x10008a sigsusp ksh 335 382579 87214 0 3 0x98 kqread sshd-session 87214 412854 63349 0 3 0x92 kqread sshd-session 63349 99798 1 0 3 0x88 kqread sshd 79785 314700 97407 74 3 0x1100092 bpf pflogd 97407 230341 1 0 3 0x80 sbwait pflogd 40355 480011 29362 73 3 0x1100090 kqread syslogd 29362 420800 1 0 3 0x100082 sbwait syslogd 60349 78927 1 0 3 0x100080 kqread resolvd 2540 454318 35871 77 3 0x100092 kqread dhcpleased 6801 322233 35871 77 3 0x100092 kqread dhcpleased 35871 266315 1 0 3 0x80 kqread dhcpleased 70402 203367 0 0 3 0x14200 bored smr 69593 226280 0 0 2 0x14200 zerothread 76953 363422 0 0 3 0x14200 aiodoned aiodoned 49467 221557 0 0 3 0x14200 syncer update 4641 446576 0 0 3 0x14200 cleaner cleaner 17252 443429 0 0 3 0x14200 reaper reaper 73142 57851 0 0 3 0x14200 pgdaemon pagedaemon 35630 292957 0 0 3 0x14200 bored viomb 94642 69749 0 0 3 0x40014200 acpi0 acpi0 81670 211554 0 0 3 0x40014200 idle1 68179 391895 0 0 3 0x14200 bored softnet1 7066 154987 0 0 2 0x14200 softnet0 28259 170043 0 0 3 0x14200 bored systqmp 8119 435461 0 0 3 0x14200 bored systq 11135 28696 0 0 3 0x14200 tmoslp softclockmp 76575 347222 0 0 3 0x40014200 tmoslp softclock 54720 312149 0 0 3 0x40014200 idle0 1 4985 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 55980 (syz-executor) thread 0xffff80003c3fad30 (429754) shared rwlock vmmaplk r = 0 (0xfffffd806c9084e8) #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_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1880 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #7 recall_trap+0x8 Process 1937 (syz-executor) thread 0xffff80003c3fb260 (383681) exclusive rwlock vcpu r = 0 (0xffff80002f791a70) #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_run+0xa2 sys/arch/amd64/amd64/vmm_machdep.c:-1 #3 vmmioctl+0x337 sys/dev/vmm/vmm.c:254 #4 VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 #5 vn_ioctl+0xf8 sys/kern/vfs_vnops.c:531 #6 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #7 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #7 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #8 Xsyscall+0x128 Process 20513 (syz-executor) thread 0xffff80003c3c87e8 (192056) exclusive rrwlock inode r = 0 (0xfffffd806b390568) #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:570 #5 spec_open+0x2f2 sys/kern/spec_vnops.c:151 #6 VOP_OPEN+0x8b sys/kern/vfs_vops.c:138 #7 vn_open+0x6a0 sys/kern/vfs_vnops.c:177 #8 vndioctl+0xc43 sys/dev/vnd.c:458 #9 VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 #10 vn_ioctl+0xf8 sys/kern/vfs_vnops.c:531 #11 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #12 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #13 Xsyscall+0x128 Process 45192 (syz-executor) thread 0xffff80003c3faa98 (457807) exclusive rrwlock inode r = 0 (0xfffffd806e0ad548) #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:570 #5 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203 #8 ufs_lookup+0x1a36 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x98a sys/kern/vfs_lookup.c:567 #11 namei+0x7ca sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1887 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806e0adc38) #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:570 #5 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 cache_lookup+0x351 sys/kern/vfs_cache.c:222 #7 ufs_lookup+0x1e3 sys/ufs/ufs/ufs_lookup.c:160 #8 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #9 vfs_lookup+0x98a sys/kern/vfs_lookup.c:567 #10 namei+0x7ca sys/kern/vfs_lookup.c:250 #11 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1887 #12 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #13 Xsyscall+0x128 Process 83242 (syz-executor) thread 0xffff8000fffeea78 (245495) exclusive rrwlock inode r = 0 (0xfffffd806e7325b8) #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:570 #5 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 cache_lookup+0x351 sys/kern/vfs_cache.c:222 #7 ufs_lookup+0x1e3 sys/ufs/ufs/ufs_lookup.c:160 #8 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #9 vfs_lookup+0x98a sys/kern/vfs_lookup.c:567 #10 namei+0x7ca sys/kern/vfs_lookup.c:250 #11 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1887 #12 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #13 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11098 12111K 12355K 166960K 13684 0 pcb 18 16K 18K 166960K 585 0 rtable 206 13K 14K 166960K 826 0 pf 31 16K 18K 166960K 194 0 ifaddr 33 6K 8K 166960K 148 0 ifgroup 48 2K 2K 166960K 261 0 sysctl 4 1K 9K 166960K 86 0 counters 68 36K 38K 166960K 270 0 ioctlops 0 0K 4K 166960K 2080 0 iov 1 16K 24K 166960K 112 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1350 85K 86K 166960K 2463 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 25 0 VM map 2 1K 1K 166960K 2 0 sem 28 17K 17K 166960K 187 0 dirhash 12 2K 3K 166960K 57 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 240K 166960K 1772 0 sigio 0 0K 0K 166960K 31 0 proc 72 115K 164K 166960K 840 0 subproc 72 4K 4K 166960K 108 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 233 0 in_multi 60 4K 7K 166960K 209 0 ether_multi 1 0K 0K 166960K 11 0 mrt 1 0K 0K 166960K 49 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 247 1102K 1102K 166960K 247 0 exec 0 0K 1K 166960K 816 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 4 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 229 160K 181K 166960K 17755 0 UVM aobj 212 168K 168K 166960K 214 0 pinsyscall 41 82K 102K 166960K 3152 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 2 0K 1K 166960K 216 0 NDP 11 0K 2K 166960K 102 0 temp 78 9088K 9203K 166960K 69673 0 kqueue 13 20K 30K 166960K 365 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 26 0 0 1 0 1 1 0 8 0 rtpcb 120 300 0 297 4 1 3 3 0 8 2 rtentry 176 228 0 161 6 2 4 6 0 8 0 unpcb 144 1250 0 1229 8 6 2 4 0 8 1 syncache 336 20 0 20 1 1 0 1 0 8 0 tcpqe 32 4 0 4 2 2 0 1 0 8 0 tcpcb 736 607 0 599 13 11 2 6 0 8 1 arp 136 32 0 18 1 0 1 1 0 8 0 inpcb 328 2243 0 2231 14 9 5 7 0 8 2 nd6 152 57 0 44 1 0 1 1 0 8 0 pkpcb 40 7 0 7 3 2 1 1 0 8 1 kcovpl 48 12 0 4 1 0 1 1 0 8 0 ppxss 1192 71 0 71 1 0 1 1 0 8 1 pppxif 1576 12 0 12 4 3 1 1 0 8 1 pffrag 232 11 0 6 1 0 1 1 0 482 0 pffrnode 88 11 0 6 1 0 1 1 0 8 0 pffrent 40 18 0 13 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 pfrktable 1344 1 0 1 1 1 0 1 0 8 0 pfstitem 24 164 0 86 1 0 1 1 0 8 0 pfstkey 128 164 0 86 3 0 3 3 0 8 0 pfstate 448 164 0 86 12 0 12 12 0 8 2 pfrule 1360 21 0 16 2 1 1 2 0 8 0 rttmr 136 8 0 8 4 3 1 1 0 8 1 art_heap8 4096 7 0 2 5 0 5 5 0 8 0 art_heap4 256 1049 0 776 33 8 25 31 0 8 4 art_table 40 1056 0 778 5 0 5 5 0 8 0 art_node 32 226 0 172 1 0 1 1 0 8 0 sysvmsgpl 40 12 0 7 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 180 0 154 1 0 1 1 0 8 0 shmpl 112 130 0 2 4 0 4 4 0 8 0 dirhash 1024 47 0 30 3 0 3 3 0 8 0 dino2pl 256 4796 0 3328 93 0 93 93 0 8 0 ffsino 296 4796 0 3328 114 0 114 114 0 8 0 nchpl 144 7109 0 5388 64 0 64 64 0 8 0 rtmask 32 16 0 16 4 3 1 1 0 8 1 vnodes 216 5271 0 0 293 0 293 293 0 8 0 namei 1024 25579 0 25579 1 0 1 1 0 8 1 percpumem 16 150 0 101 1 0 1 1 0 8 0 vcpupl 3968 81 0 0 11 0 11 11 0 8 0 vmpool 848 81 0 0 9 0 9 9 0 8 0 kstatmem 264 158 0 132 4 1 3 3 0 8 0 scsiplug 72 11 0 11 3 3 0 1 0 8 0 scxspl 216 42790 0 42790 14 12 2 8 1 8 2 plimitpl 152 674 0 655 1 0 1 1 0 8 0 sigapl 424 2100 0 2034 9 0 9 9 0 8 0 knotepl 120 588 0 0 17 0 17 17 0 8 0 kqueuepl 224 582 0 572 3 2 1 2 0 8 0 pipepl 344 301 0 272 6 3 3 6 0 8 0 fdescpl 528 2062 0 2032 3 0 3 3 0 8 0 filepl 160 14205 0 13974 20 6 14 16 0 8 1 lockfpl 104 632 0 630 1 0 1 1 0 8 0 lockfspl 48 254 0 252 1 0 1 1 0 8 0 sessionpl 144 45 0 36 1 0 1 1 0 8 0 pgrppl 48 85 0 68 1 0 1 1 0 8 0 ucredpl 104 2381 0 2365 1 0 1 1 0 8 0 zombiepl 144 2036 0 2034 1 0 1 1 0 8 0 processpl 1232 2100 0 2034 6 0 6 6 0 8 0 procpl 664 4758 0 4686 8 0 8 8 0 8 0 sosppl 176 20 0 20 2 1 1 1 0 8 1 sockpl 752 3839 0 3803 18 7 11 11 0 8 6 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 122 0 0 16 1 15 16 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 46 0 0 5 0 5 5 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 441 0 0 27 0 27 27 0 8 0 bufpl 280 14884 0 8755 438 0 438 438 0 8 0 anonpl 32 13989 0 0 113 0 113 113 0 246 0 amapchunkpl 152 60575 0 60106 53 18 35 35 0 158 12 amappl16 200 6694 0 6657 54 38 16 34 0 8 8 amappl15 192 12 0 12 1 1 0 1 0 8 0 amappl14 184 478 0 476 1 0 1 1 0 8 0 amappl13 176 178 0 166 1 0 1 1 0 8 0 amappl12 168 2343 0 2314 2 0 2 2 0 8 0 amappl11 160 8 0 8 2 2 0 1 0 8 0 amappl10 152 67 0 53 1 0 1 1 0 8 0 amappl9 144 265 0 265 1 1 0 1 0 8 0 amappl8 136 116 0 113 1 0 1 1 0 8 0 amappl7 128 207 0 194 1 0 1 1 0 8 0 amappl6 120 207 0 205 1 0 1 1 0 8 0 amappl5 112 145 0 134 1 0 1 1 0 8 0 amappl4 104 387 0 364 1 0 1 1 0 8 0 amappl3 96 12301 0 12199 4 0 4 4 0 8 0 amappl2 88 811 0 747 2 0 2 2 0 8 0 amappl1 80 24114 0 23525 17 1 16 17 0 8 0 amappl 88 16498 0 16341 5 0 5 5 0 92 0 uvmvnodes 80 160 0 0 4 0 4 4 0 8 0 dma32768 32768 1 0 1 1 0 1 1 0 8 1 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma512 512 1 0 1 1 1 0 1 0 8 0 dma256 256 8 0 8 3 3 0 1 0 8 0 dma128 128 259 0 259 4 4 0 1 0 8 0 dma64 64 9 0 9 4 3 1 1 0 8 1 dma32 32 8 0 8 2 2 0 1 0 8 0 dma16 16 19 0 18 1 0 1 1 0 8 0 aobjpl 72 213 0 2 4 0 4 4 0 8 0 uaddrrnd 24 2062 0 2032 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2062 0 2032 1 0 1 1 0 8 0 vmmpekpl 168 19821 0 19766 3 0 3 3 0 8 0 vmmpepl 168 146760 0 144890 128 13 115 115 0 357 16 vmsppl 488 2061 0 2032 5 0 5 5 0 8 0 rwobjpl 80 43475 0 42166 41 1 40 40 0 8 5 pdppl 4096 4293 0 4145 209 57 152 153 0 8 4 pvpl 32 22077 0 0 178 0 178 178 0 265 0 pmappl 256 2142 0 2032 8 0 8 8 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 438 0 84 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff838edff0) 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+0x33 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153 _isitmyx(fffffd8004043e00,fffffd8004048600,1,ffffffff833e68a7) at _isitmyx+0x150 sys/kern/subr_witness.c:1678 witness_checkorder(fffffd806d825198,1,0) at witness_checkorder+0x835 isitmychild sys/kern/subr_witness.c:1704 [inline] witness_checkorder(fffffd806d825198,1,0) at witness_checkorder+0x835 witness_lock_order_check sys/kern/subr_witness.c:2507 [inline] witness_checkorder(fffffd806d825198,1,0) at witness_checkorder+0x835 sys/kern/subr_witness.c:899 rw_do_enter_read(fffffd806d825180,2) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 uvm_fault_lower_lookup(ffff80002a2c83f0,ffff80002a2c8428,ffff80002a2c8370) at uvm_fault_lower_lookup+0x53 sys/uvm/uvm_fault.c:1204 uvm_fault_lower(ffff80002a2c83f0,ffff80002a2c8428,ffff80002a2c8370) at uvm_fault_lower+0x89 sys/uvm/uvm_fault.c:1334 uvm_fault(fffffd806c9083e8,552de9ef000,0,4) at uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff80002a2c8590,552de9ef649) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80002a2c8590) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7324230aad10, count: -13 ddb{0}> machine ddbcpu 1 Stopped at done_flush+0x38: movl %eax,%dr6 ddb{1}> trace end trace frame: 0x0, count: -1