witness: lock order reversal: 1st 0xffffffff82cc8bd0 &sched_lock (&sched_lock) 2nd 0xffff8000ffff5e78 &pr->ps_mtx (&pr->ps_mtx) lock order "&pr->ps_mtx"(mutex) -> "&sched_lock"(sched_lock) first seen at: #0 __mp_lock+0xa2 read_rflags machine/cpufunc.h:195 [inline] #0 __mp_lock+0xa2 intr_disable machine/cpufunc.h:216 [inline] #0 __mp_lock+0xa2 sys/kern/kern_lock.c:142 #1 donice+0x178 sys/kern/kern_resource.c:218 #2 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #2 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #3 Xsyscall+0x128 lock order "&sched_lock"(sched_lock) -> "&pr->ps_mtx"(mutex) first seen at: #0 mtx_enter+0x3e sys/kern/kern_lock.c:265 #1 single_thread_set+0x35a single_thread_wait sys/kern/kern_sig.c:2172 [inline] #1 single_thread_set+0x35a sys/kern/kern_sig.c:2155 #2 sigexit+0x90 sys/kern/kern_sig.c:1562 #3 postsig+0x4a9 sys/kern/kern_sig.c:1494 #4 userret+0x16e sys/kern/kern_sig.c:1987 #5 syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] #5 syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 #6 Xsyscall+0x128 Stopped at db_enter+0x1c: addq $0x8,%rsp ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(ffff8000ffff5e78,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2510 [inline] witness_checkorder(ffff8000ffff5e78,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1110 mtx_enter(ffff8000ffff5e68) at mtx_enter+0x3e sys/kern/kern_lock.c:265 single_thread_set(ffff800023efc2b0,0,1) at single_thread_set+0x35a single_thread_wait sys/kern/kern_sig.c:2172 [inline] single_thread_set(ffff800023efc2b0,0,1) at single_thread_set+0x35a sys/kern/kern_sig.c:2155 sigexit(ffff800023efc2b0,6) at sigexit+0x90 sys/kern/kern_sig.c:1562 postsig(ffff800023efc2b0,6,ffff800021276f68) at postsig+0x4a9 sys/kern/kern_sig.c:1494 userret(ffff800023efc2b0) at userret+0x16e sys/kern/kern_sig.c:1987 syscall(ffff8000212770a0) at syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] syscall(ffff8000212770a0) at syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc1de2d27680, count: -9 ddb{1}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be63 rbp 0xffff800021276c70 rbx 0x3 rdx 0xffff800000d10e80 rcx 0xffff800023efc2b0 rax 0x3ffff acpi_pdirpa+0x2be62 r8 0xffff800021276be0 r9 0x8080808080808080 r10 0x8f70edc4419dbd99 r11 0x30759a712e1c2038 r12 0xfffffd8003a0a640 r13 0 r14 0xfffffd80039ff220 r15 0xfffffd80031c7bc0 rip 0xffffffff81b6e27c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff800021276c60 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.6) pid=737 stat=onproc flags process=500010 proc=4002000 pri=32, usrpri=66, nice=20 forw=0xffffffffffffffff, list=0xffff800023efcff8,0xffffffff82c90e98 process=0xffff8000ffff5d68 user=0xffff800021272000, vmspace=0xfffffd80635b43c8 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 49996 459798 49066 32767 2 0x10 syz-executor.7 81255 391665 24436 32767 2 0x10 syz-executor.0 95677 265537 55064 32767 4 0x582010 syz-executor.6 *95677 737 55064 32767 7 0x4502010 syz-executor.6 71593 368920 82304 32767 2 0x10 syz-executor.5 94588 184553 58091 32767 2 0x10 syz-executor.1 58091 292232 26359 32767 3 0x90 nanoslp syz-executor.1 26359 337768 1661 0 3 0x82 wait syz-executor.1 49066 523867 66178 32767 3 0x90 nanoslp syz-executor.7 55064 180563 82450 32767 3 0x90 nanoslp syz-executor.6 66178 309323 1661 0 3 0x82 wait syz-executor.7 82304 158723 30412 32767 3 0x90 nanoslp syz-executor.5 56114 476568 62353 32767 3 0x10 biowait syz-executor.4 82450 182267 1661 0 3 0x82 wait syz-executor.6 93236 71735 11962 32767 3 0x10 biowait syz-executor.3 62353 379089 1661 0 3 0x82 wait syz-executor.4 30412 519214 1661 0 3 0x82 wait syz-executor.5 11962 290522 1661 0 3 0x82 wait syz-executor.3 8311 294842 39428 32767 7 0x10 syz-executor.2 24436 66487 51457 32767 2 0x10 syz-executor.0 39428 447040 1661 0 3 0x82 wait syz-executor.2 51457 22640 1661 0 3 0x82 wait syz-executor.0 1661 367896 77543 0 3 0x2000082 wait syz-fuzzer 1661 165941 77543 0 3 0x6000082 nanoslp syz-fuzzer 1661 53458 77543 0 3 0x6000082 thrsleep syz-fuzzer 1661 179198 77543 0 3 0x6000082 wait syz-fuzzer 1661 293798 77543 0 3 0x6000082 wait syz-fuzzer 1661 379822 77543 0 3 0x6000082 wait syz-fuzzer 1661 273243 77543 0 3 0x6000082 thrsleep syz-fuzzer 1661 194746 77543 0 3 0x6000082 wait syz-fuzzer 1661 295867 77543 0 3 0x6000082 thrsleep syz-fuzzer 1661 253854 77543 0 3 0x6000082 wait syz-fuzzer 1661 396874 77543 0 3 0x6000082 thrsleep syz-fuzzer 1661 327709 77543 0 3 0x6000082 wait syz-fuzzer 1661 302693 77543 0 3 0x6000082 thrsleep syz-fuzzer 1661 150436 77543 0 3 0x6000082 kqread syz-fuzzer 1661 15267 77543 0 3 0x6000082 wait syz-fuzzer 77543 361221 53027 0 3 0x10008a sigsusp ksh 53027 90133 46894 0 3 0x9a kqread sshd 36595 426531 1 0 3 0x100083 ttyin getty 46894 480764 1 0 3 0x88 kqread sshd 59198 242839 4175 73 3 0x1100090 kqread syslogd 4175 361660 1 0 3 0x100082 netio syslogd 53571 359698 1 0 3 0x100080 kqread resolvd 42757 490214 2311 77 3 0x100092 kqread dhcpleased 58377 454844 2311 77 3 0x100092 kqread dhcpleased 2311 18458 1 0 3 0x80 kqread dhcpleased 5226 439921 0 0 3 0x14200 bored smr 78007 76555 0 0 2 0x14200 zerothread 38135 350205 0 0 3 0x14200 aiodoned aiodoned 91940 496747 0 0 3 0x14200 syncer update 14246 441934 0 0 3 0x14200 cleaner cleaner 35987 141299 0 0 3 0x14200 reaper reaper 35282 324193 0 0 3 0x14200 pgdaemon pagedaemon 19522 13692 0 0 3 0x14200 bored viomb 83398 16047 0 0 3 0x40014200 acpi0 acpi0 13133 103068 0 0 3 0x40014200 idle1 82320 268726 0 0 3 0x14200 bored softnet3 23233 424971 0 0 3 0x14200 bored softnet2 39273 490800 0 0 3 0x14200 bored softnet1 89565 115502 0 0 3 0x14200 bored softnet0 47760 394267 0 0 3 0x14200 bored systqmp 40745 110861 0 0 3 0x14200 bored systq 94160 466508 0 0 3 0x40014200 bored softclock 3780 274433 0 0 3 0x40014200 idle0 1 385738 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive sched_lock &sched_lock r = 0 (0xffffffff82cc8bd0) #0 witness_lock+0x447 #1 single_thread_set+0x179 sys/kern/kern_sig.c:2113 #2 sigexit+0x90 sys/kern/kern_sig.c:1562 #3 postsig+0x4a9 sys/kern/kern_sig.c:1494 #4 userret+0x16e sys/kern/kern_sig.c:1987 #5 syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] #5 syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 #6 Xsyscall+0x128 Process 95677 (syz-executor.6) thread 0xffff800023efc2b0 (737) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82ca0228) #0 witness_lock+0x447 #1 postsig+0x49e sys/kern/kern_sig.c:1500 #2 userret+0x16e sys/kern/kern_sig.c:1987 #3 syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] #3 syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 #4 Xsyscall+0x128 exclusive sched_lock &sched_lock r = 0 (0xffffffff82cc8bd0) #0 witness_lock+0x447 #1 single_thread_set+0x179 sys/kern/kern_sig.c:2113 #2 sigexit+0x90 sys/kern/kern_sig.c:1562 #3 postsig+0x4a9 sys/kern/kern_sig.c:1494 #4 userret+0x16e sys/kern/kern_sig.c:1987 #5 syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] #5 syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 #6 Xsyscall+0x128 Process 56114 (syz-executor.4) thread 0xffff80002121b808 (476568) exclusive rrwlock inode r = 0 (0xfffffd8065b34c48) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 ufs_ihashins+0x46 sys/ufs/ufs/ufs_ihash.c:140 #5 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1343 #6 ffs_inode_alloc+0x1c2 sys/ufs/ffs/ffs_alloc.c:394 #7 ufs_mkdir+0xf8 sys/ufs/ufs/ufs_vnops.c:1149 #8 VOP_MKDIR+0xc3 sys/kern/vfs_vops.c:388 #9 domkdirat+0x125 sys/kern/vfs_syscalls.c:3073 #10 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #10 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8066bf2810) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:564 #5 vfs_lookup+0xd5 sys/kern/vfs_lookup.c:418 #6 namei+0x55a sys/kern/vfs_lookup.c:250 #7 domkdirat+0x79 sys/kern/vfs_syscalls.c:3058 #8 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #8 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #9 Xsyscall+0x128 Process 93236 (syz-executor.3) thread 0xffff80002121aac0 (71735) exclusive rrwlock inode r = 0 (0xfffffd8065b34f78) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 ufs_ihashins+0x46 sys/ufs/ufs/ufs_ihash.c:140 #5 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1343 #6 ffs_inode_alloc+0x1c2 sys/ufs/ffs/ffs_alloc.c:394 #7 ufs_mkdir+0xf8 sys/ufs/ufs/ufs_vnops.c:1149 #8 VOP_MKDIR+0xc3 sys/kern/vfs_vops.c:388 #9 domkdirat+0x125 sys/kern/vfs_syscalls.c:3073 #10 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #10 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8066bf22c0) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:564 #5 vfs_lookup+0xd5 sys/kern/vfs_lookup.c:418 #6 namei+0x55a sys/kern/vfs_lookup.c:250 #7 domkdirat+0x79 sys/kern/vfs_syscalls.c:3058 #8 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #8 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #9 Xsyscall+0x128 Process 8311 (syz-executor.2) thread 0xffff80002121b2b8 (294842) shared rwlock vmmaplk r = 0 (0xfffffd806bbe7680) #0 witness_lock+0x447 #1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1785 #2 uvm_fault_check+0x3e sys/uvm/uvm_fault.c:672 #3 uvm_fault+0xf2 sys/uvm/uvm_fault.c:600 #4 upageflttrap+0x86 sys/arch/amd64/amd64/trap.c:188 #5 usertrap+0x226 sys/arch/amd64/amd64/trap.c:436 #6 recall_trap+0x8 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10184 6408K 6420K 78643K 11268 0 pcb 13 8K 8K 78643K 13 0 rtable 234 6K 6K 78643K 415 0 pf 29 8K 8K 78643K 33 0 ifaddr 44 15K 15K 78643K 54 0 ifgroup 50 2K 2K 78643K 58 0 counters 60 35K 35K 78643K 64 0 ioctlops 0 0K 2K 78643K 34 0 iov 0 0K 16K 78643K 86 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1278 80K 80K 78643K 1447 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 8 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 56 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 23 85K 125K 78643K 823 0 sigio 0 0K 0K 78643K 68 0 proc 56 78K 115K 78643K 563 0 subproc 104 6K 6K 78643K 130 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 21 0 in_multi 99 7K 7K 78643K 130 0 ether_multi 1 0K 0K 78643K 1 0 mrt 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 49 228K 228K 78643K 49 0 exec 0 0K 1K 78643K 415 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 320 85K 87K 78643K 10068 0 UVM aobj 7 2K 2K 78643K 10 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 15 0 NDP 11 0K 2K 78643K 33 0 temp 74 5920K 5984K 78643K 6054 0 kqueue 12 18K 28K 78643K 68 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> 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 120 118 0 115 3 2 1 3 0 8 0 rtentry 112 133 0 23 4 0 4 4 0 8 0 unpcb 144 411 0 398 5 4 1 4 0 8 0 syncache 304 12 0 12 3 2 1 1 0 8 1 tcpqe 32 123 0 123 3 3 0 1 0 8 0 tcpcb 808 252 0 248 8 6 2 8 0 8 1 arp 120 22 0 4 1 0 1 1 0 8 0 inpcb 368 451 0 444 8 6 2 8 0 8 1 nd6 136 30 0 6 1 0 1 1 0 8 0 kcovpl 48 10 0 2 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 541 0 88 29 0 29 29 0 8 0 art_table 32 542 0 88 4 0 4 4 0 8 0 art_node 16 132 0 32 1 0 1 1 0 8 0 semapl 112 54 0 44 1 0 1 1 0 8 0 shmpl 112 7 0 3 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2378 0 940 91 0 91 91 0 8 0 ffsino 272 2378 0 940 97 0 97 97 0 8 0 nchpl 144 3495 0 1858 63 0 63 63 0 8 0 uvmvnodes 80 2517 0 0 52 0 52 52 0 8 0 vnodes 216 2517 0 0 140 0 140 140 0 8 0 namei 1024 12274 0 12272 2 1 1 2 0 8 0 percpumem 16 45 0 2 1 0 1 1 0 8 0 kstatmem 264 26 0 4 2 0 2 2 0 8 0 scxspl 216 15485 0 15483 10 9 1 8 1 8 0 plimitpl 152 80 0 57 2 1 1 2 0 8 0 sigapl 424 1115 0 1064 7 0 7 7 0 8 0 futexpl 64 6041 0 6041 1 0 1 1 0 8 1 knotepl 120 330 0 0 10 0 10 10 0 8 0 kqueuepl 216 107 0 99 1 0 1 1 0 8 0 pipepl 320 304 0 276 6 3 3 6 0 8 0 fdescpl 496 1098 0 1064 7 2 5 6 0 8 0 filepl 152 6193 0 5959 16 3 13 16 0 8 3 lockfpl 104 130 0 128 1 0 1 1 0 8 0 lockfspl 48 26 0 24 1 0 1 1 0 8 0 sessionpl 144 25 0 9 1 0 1 1 0 8 0 pgrppl 48 27 0 11 1 0 1 1 0 8 0 ucredpl 104 678 0 660 1 0 1 1 0 8 0 zombiepl 144 1064 0 1064 1 0 1 1 0 8 1 processpl 1072 1115 0 1064 5 1 4 5 0 8 0 procpl 680 2310 0 2244 9 2 7 8 0 8 0 sockpl 488 1004 0 981 24 15 9 21 0 8 6 mcl64k 65536 15 0 0 2 0 2 2 0 8 0 mcl16k 16384 6 0 0 1 0 1 1 0 8 0 mcl12k 12288 4 0 0 1 0 1 1 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 9 0 0 2 0 2 2 0 8 0 mcl4k 4096 7 0 0 1 0 1 1 0 8 0 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 285 0 0 36 0 36 36 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 297 0 0 19 0 19 19 0 8 0 bufpl 288 5160 0 138 359 0 359 359 0 8 0 anonpl 24 257931 0 247910 95 3 92 92 0 186 16 amapchunkpl 152 32335 0 31553 40 2 38 40 0 158 1 amappl16 200 6856 0 6585 27 4 23 27 0 8 8 amappl15 192 12 0 12 2 2 0 1 0 8 0 amappl14 184 163 0 148 2 1 1 2 0 8 0 amappl13 176 24 0 22 1 0 1 1 0 8 0 amappl12 168 1765 0 1730 3 1 2 3 0 8 0 amappl11 160 47 0 37 1 0 1 1 0 8 0 amappl10 152 22 0 13 2 1 1 1 0 8 0 amappl9 144 216 0 215 1 0 1 1 0 8 0 amappl8 136 246 0 184 3 0 3 3 0 8 0 amappl7 128 60 0 47 2 0 2 2 0 8 0 amappl6 120 246 0 228 2 1 1 2 0 8 0 amappl5 112 208 0 199 1 0 1 1 0 8 0 amappl4 104 571 0 532 3 1 2 3 0 8 0 amappl3 96 6640 0 6569 3 0 3 3 0 8 0 amappl2 88 1367 0 1298 3 1 2 3 0 8 0 amappl1 80 12411 0 11888 22 9 13 22 0 8 0 amappl 88 9519 0 9301 7 0 7 7 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 9 0 3 1 0 1 1 0 8 0 uaddrrnd 24 1098 0 1064 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1098 0 1064 1 0 1 1 0 8 0 vmmpekpl 168 13977 0 13905 4 0 4 4 0 8 0 vmmpepl 168 86725 0 84504 129 16 113 128 0 357 7 vmsppl 464 1097 0 1064 7 2 5 6 0 8 0 rwobjpl 56 31157 0 27394 55 1 54 54 0 8 0 pdppl 4096 2204 0 2128 132 50 82 96 0 8 6 pvpl 32 578410 0 562861 363 38 325 361 0 265 178 pmappl 248 1097 0 1064 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 803 0 67 22 0 22 22 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff82c05ff0) at x86_ipi_db+0x1e 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+0x27 __mp_lock(ffffffff82ca0020) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82ca0020) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff800023f09340,ffff800000069c00) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff82ca0020) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82ca0020) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff800023f09490,ffff80000006bc00) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x30 kd_curproc sys/dev/kcov.c:590 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x30 sys/dev/kcov.c:158 witness_assert(fffffd806bbe7680,2) at witness_assert+0x345 sys/kern/subr_witness.c:1988 rw_exit_read(fffffd806bbe7670) at rw_exit_read+0x5a rw_assert_rdlock sys/kern/kern_rwlock.c:398 [inline] rw_exit_read(fffffd806bbe7670) at rw_exit_read+0x5a sys/kern/kern_rwlock.c:137 uvm_fault_upper(ffff800023f09780,ffff800023f097b8,ffff800023f09680,0) at uvm_fault_upper+0x375 sys/uvm/uvm_fault.c:1104 uvm_fault(fffffd806bbe7588,2c5dce47000,0,2) at uvm_fault+0x154 sys/uvm/uvm_fault.c:608 upageflttrap(ffff800023f09900,2c5dce47b70) at upageflttrap+0x86 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff800023f09900) at usertrap+0x226 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7432e9536360, count: -17 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x1c: addq $0x8,%rsp ddb{1}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(ffff8000ffff5e78,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2510 [inline] witness_checkorder(ffff8000ffff5e78,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1110 mtx_enter(ffff8000ffff5e68) at mtx_enter+0x3e sys/kern/kern_lock.c:265 single_thread_set(ffff800023efc2b0,0,1) at single_thread_set+0x35a single_thread_wait sys/kern/kern_sig.c:2172 [inline] single_thread_set(ffff800023efc2b0,0,1) at single_thread_set+0x35a sys/kern/kern_sig.c:2155 sigexit(ffff800023efc2b0,6) at sigexit+0x90 sys/kern/kern_sig.c:1562 postsig(ffff800023efc2b0,6,ffff800021276f68) at postsig+0x4a9 sys/kern/kern_sig.c:1494 userret(ffff800023efc2b0) at userret+0x16e sys/kern/kern_sig.c:1987 syscall(ffff8000212770a0) at syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] syscall(ffff8000212770a0) at syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc1de2d27680, count: -9