witness: lock order reversal: 1st 0xffffffff82d0ad08 &sched_lock (&sched_lock) 2nd 0xffff800027b60db8 &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(ffff800027b60db8,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2510 [inline] witness_checkorder(ffff800027b60db8,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1110 mtx_enter(ffff800027b60da8) at mtx_enter+0x3e sys/kern/kern_lock.c:265 single_thread_set(ffff80002121b550,0,1) at single_thread_set+0x35a single_thread_wait sys/kern/kern_sig.c:2172 [inline] single_thread_set(ffff80002121b550,0,1) at single_thread_set+0x35a sys/kern/kern_sig.c:2155 sigexit(ffff80002121b550,6) at sigexit+0x90 sys/kern/kern_sig.c:1562 postsig(ffff80002121b550,6,ffff800021269228) at postsig+0x4a9 sys/kern/kern_sig.c:1494 userret(ffff80002121b550) at userret+0x16e sys/kern/kern_sig.c:1987 syscall(ffff800021269360) at syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] syscall(ffff800021269360) at syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa93554f520, count: -9 ddb{1}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be63 rbp 0xffff800021268f30 rbx 0x3 rdx 0xffff800000d0e7c0 rcx 0xffff80002121b550 rax 0x3ffff acpi_pdirpa+0x2be62 r8 0xffff800021268ea0 r9 0x8080808080808080 r10 0xd3a754f5c73e7377 r11 0x88c8dcccd8830e7a r12 0xfffffd8003a0a640 r13 0 r14 0xfffffd80039fbe90 r15 0xfffffd80031c7bc0 rip 0xffffffff81334fdc db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff800021268f20 ss 0 db_enter+0x1c: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.4) pid=84853 stat=onproc flags process=500010 proc=4002000 pri=32, usrpri=80, nice=20 forw=0xffffffffffffffff, list=0xffff80002121aab0,0xffff80002121b2b8 process=0xffff800027b60ca8 user=0xffff800021264000, vmspace=0xfffffd80728fb598 estcpu=30, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 77240 18685 56189 32767 7 0x10 syz-executor.2 89803 496438 47463 32767 4 0x582010 syz-executor.4 *89803 84853 47463 32767 7 0x4502010 syz-executor.4 15695 200447 363 32767 2 0x10 syz-executor.3 15695 63342 363 32767 3 0x4000090 kqpoll syz-executor.3 96700 522867 65912 32767 3 0x90 nanoslp syz-executor.6 96700 313312 65912 32767 3 0x4000090 fsleep syz-executor.6 96700 296745 65912 32767 2 0x4000010 syz-executor.6 63331 303076 67290 32767 2 0x10 syz-executor.0 63331 109008 67290 32767 3 0x4000090 fsleep syz-executor.0 67290 300064 15326 32767 3 0x90 nanoslp syz-executor.0 15326 176738 75614 0 3 0x82 wait syz-executor.0 41297 337688 0 0 3 0x14200 bored sosplice 63150 116352 16693 32767 3 0x10 biowait syz-executor.7 16693 378424 75614 0 3 0x82 wait syz-executor.7 65912 434485 51470 32767 3 0x90 nanoslp syz-executor.6 51470 458577 75614 0 3 0x82 wait syz-executor.6 10191 228293 49491 32767 2 0x10 syz-executor.5 47463 67087 5923 32767 3 0x90 nanoslp syz-executor.4 49491 241254 75614 0 3 0x82 wait syz-executor.5 5923 364636 75614 0 3 0x82 wait syz-executor.4 363 474261 85459 32767 3 0x90 nanoslp syz-executor.3 56189 18814 44227 32767 3 0x90 nanoslp syz-executor.2 85459 498787 75614 0 3 0x82 wait syz-executor.3 7909 204371 7606 32767 3 0x10 biowait syz-executor.1 44227 410514 75614 0 3 0x82 wait syz-executor.2 7606 57075 75614 0 3 0x82 wait syz-executor.1 75614 311826 17043 0 3 0x2000082 thrsleep syz-fuzzer 75614 179822 17043 0 3 0x6000082 nanoslp syz-fuzzer 75614 271363 17043 0 3 0x6000082 wait syz-fuzzer 75614 148470 17043 0 3 0x6000082 wait syz-fuzzer 75614 216642 17043 0 3 0x6000082 wait syz-fuzzer 75614 52344 17043 0 3 0x6000082 kqread syz-fuzzer 75614 166433 17043 0 3 0x6000082 wait syz-fuzzer 75614 56551 17043 0 3 0x6000082 wait syz-fuzzer 75614 27256 17043 0 3 0x6000082 thrsleep syz-fuzzer 75614 145143 17043 0 3 0x6000082 wait syz-fuzzer 75614 41646 17043 0 3 0x6000082 thrsleep syz-fuzzer 75614 435180 17043 0 3 0x6000082 wait syz-fuzzer 75614 16930 17043 0 3 0x6000082 wait syz-fuzzer 75614 392665 17043 0 3 0x6000082 thrsleep syz-fuzzer 75614 47893 17043 0 3 0x6000082 thrsleep syz-fuzzer 75614 354794 17043 0 3 0x6000082 thrsleep syz-fuzzer 17043 398232 48104 0 3 0x10008a sigsusp ksh 48104 432608 80322 0 3 0x9a kqread sshd 98824 335741 1 0 3 0x100083 ttyin getty 80322 303411 1 0 3 0x88 kqread sshd 8387 101995 59184 73 3 0x1100090 kqread syslogd 59184 207765 1 0 3 0x100082 netio syslogd 37198 114544 1 0 3 0x100080 kqread resolvd 52683 188977 30605 77 3 0x100092 kqread dhcpleased 83405 338886 30605 77 3 0x100092 kqread dhcpleased 30605 207184 1 0 3 0x80 kqread dhcpleased 57445 25584 0 0 3 0x14200 bored smr 82585 342197 0 0 2 0x14200 zerothread 13288 127685 0 0 3 0x14200 aiodoned aiodoned 85363 67428 0 0 3 0x14200 syncer update 7805 107838 0 0 3 0x14200 cleaner cleaner 65885 393153 0 0 3 0x14200 reaper reaper 10612 205421 0 0 3 0x14200 pgdaemon pagedaemon 39086 91224 0 0 3 0x14200 bored viomb 57344 520211 0 0 3 0x40014200 acpi0 acpi0 91097 258335 0 0 3 0x40014200 idle1 81922 67879 0 0 3 0x14200 bored softnet3 39152 110337 0 0 3 0x14200 bored softnet2 84433 404757 0 0 3 0x14200 bored softnet1 73235 394544 0 0 3 0x14200 bored softnet0 30536 253812 0 0 3 0x14200 bored systqmp 95844 440903 0 0 3 0x14200 bored systq 37590 43572 0 0 3 0x40014200 bored softclock 33770 21448 0 0 3 0x40014200 idle0 1 420503 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 (0xffffffff82d0ad08) #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 89803 (syz-executor.4) thread 0xffff80002121b550 (84853) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82c795f0) #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 (0xffffffff82d0ad08) #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 63150 (syz-executor.7) thread 0xffff800021280aa0 (116352) exclusive rrwlock inode r = 0 (0xfffffd807cbd81a8) #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 (0xfffffd80728f73d8) #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 7909 (syz-executor.1) thread 0xffff80002120c568 (204371) exclusive rrwlock inode r = 0 (0xfffffd807cbd8918) #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 (0xfffffd806d8545f8) #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10190 6408K 6420K 78643K 11277 0 pcb 13 8K 8K 78643K 13 0 rtable 236 6K 6K 78643K 457 0 pf 29 8K 8K 78643K 35 0 ifaddr 44 15K 15K 78643K 58 0 ifgroup 50 2K 2K 78643K 62 0 sysctl 2 0K 0K 78643K 2 0 counters 60 35K 35K 78643K 66 0 ioctlops 0 0K 2K 78643K 32 0 iov 0 0K 16K 78643K 115 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1278 80K 80K 78643K 1831 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 16 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 294 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 23 85K 113K 78643K 1341 0 sigio 0 0K 0K 78643K 1 0 proc 56 78K 115K 78643K 617 0 subproc 104 6K 6K 78643K 143 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 34 0 in_multi 99 7K 7K 78643K 138 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 79 360K 360K 78643K 79 0 exec 0 0K 1K 78643K 529 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 347 88K 93K 78643K 14988 0 UVM aobj 131 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 32 0 NDP 11 0K 2K 78643K 36 0 temp 74 5916K 5980K 78643K 6897 0 kqueue 12 18K 22K 78643K 63 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 90 0 87 1 0 1 1 0 8 0 rtentry 112 146 0 35 4 0 4 4 0 8 0 unpcb 144 397 0 384 4 3 1 4 0 8 0 syncache 304 12 0 12 2 1 1 1 0 8 1 tcpqe 32 118 0 118 2 1 1 1 0 8 1 tcpcb 808 455 0 451 14 7 7 8 0 8 6 arp 120 24 0 6 1 0 1 1 0 8 0 ipq 40 3 0 1 2 1 1 1 0 8 0 ipqe 40 10 0 6 2 1 1 1 0 8 0 inpcb 368 898 0 890 17 10 7 8 0 8 6 nd6 136 35 0 10 1 0 1 1 0 8 0 kcovpl 48 11 0 3 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 587 0 133 29 0 29 29 0 8 0 art_table 32 588 0 133 4 0 4 4 0 8 0 art_node 16 145 0 44 1 0 1 1 0 8 0 sysvmsgpl 40 25 0 24 2 1 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 292 0 282 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 3532 0 2090 91 0 91 91 0 8 0 ffsino 272 3532 0 2090 97 0 97 97 0 8 0 nchpl 144 5494 0 3853 63 0 63 63 0 8 0 uvmvnodes 80 3684 0 0 76 0 76 76 0 8 0 vnodes 216 3684 0 0 205 0 205 205 0 8 0 namei 1024 18489 0 18487 2 1 1 2 0 8 0 percpumem 16 46 0 3 1 0 1 1 0 8 0 kstatmem 264 28 0 6 2 0 2 2 0 8 0 scxspl 216 15694 0 15692 14 13 1 8 1 8 0 plimitpl 152 224 0 201 4 2 2 2 0 8 1 sigapl 424 1629 0 1577 7 0 7 7 0 8 0 futexpl 64 11814 0 11812 1 0 1 1 0 8 0 knotepl 120 136 0 0 4 0 4 4 0 8 0 kqueuepl 216 245 0 236 5 0 5 5 0 8 4 pipepl 320 226 0 198 3 0 3 3 0 8 0 fdescpl 496 1611 0 1577 7 2 5 6 0 8 0 filepl 152 9675 0 9434 24 10 14 15 0 8 4 lockfpl 104 82 0 80 1 0 1 1 0 8 0 lockfspl 48 41 0 39 1 0 1 1 0 8 0 sessionpl 144 26 0 10 1 0 1 1 0 8 0 pgrppl 48 32 0 16 1 0 1 1 0 8 0 ucredpl 104 2916 0 2898 1 0 1 1 0 8 0 zombiepl 144 1577 0 1577 1 0 1 1 0 8 1 processpl 1072 1629 0 1577 4 0 4 4 0 8 0 procpl 680 3695 0 3623 13 5 8 8 0 8 1 sosppl 168 76 0 76 3 2 1 1 0 8 1 sockpl 488 1395 0 1371 27 16 11 13 0 8 7 mcl64k 65536 8 0 0 1 0 1 1 0 8 0 mcl16k 16384 15 0 0 2 0 2 2 0 8 0 mcl12k 12288 10 0 0 1 0 1 1 0 8 0 mcl9k 9216 12 0 0 1 0 1 1 0 8 0 mcl8k 8192 9 0 0 2 0 2 2 0 8 0 mcl4k 4096 10 0 0 2 0 2 2 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 252 0 0 32 0 32 32 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 997 0 0 59 0 59 59 0 8 0 bufpl 288 5865 0 140 409 0 409 409 0 8 0 anonpl 24 326194 0 315300 118 27 91 92 0 186 1 amapchunkpl 152 48242 0 47358 58 18 40 45 0 158 1 amappl16 200 8822 0 8556 46 23 23 28 0 8 8 amappl15 192 10 0 9 1 0 1 1 0 8 0 amappl14 184 159 0 145 2 1 1 2 0 8 0 amappl13 176 25 0 24 1 0 1 1 0 8 0 amappl12 168 2281 0 2247 2 0 2 2 0 8 0 amappl11 160 54 0 43 1 0 1 1 0 8 0 amappl10 152 29 0 18 1 0 1 1 0 8 0 amappl9 144 193 0 192 1 0 1 1 0 8 0 amappl8 136 245 0 180 3 0 3 3 0 8 0 amappl7 128 87 0 74 2 0 2 2 0 8 0 amappl6 120 252 0 232 2 1 1 2 0 8 0 amappl5 112 221 0 211 1 0 1 1 0 8 0 amappl4 104 577 0 540 3 1 2 3 0 8 0 amappl3 96 9891 0 9804 3 0 3 3 0 8 0 amappl2 88 1892 0 1817 3 0 3 3 0 8 0 amappl1 80 14169 0 13641 22 10 12 22 0 8 0 amappl 88 14417 0 14174 8 1 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 72 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 1611 0 1577 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1611 0 1577 1 0 1 1 0 8 0 vmmpekpl 168 17810 0 17748 3 0 3 3 0 8 0 vmmpepl 168 116535 0 114259 135 18 117 117 0 357 12 vmsppl 464 1610 0 1577 7 2 5 6 0 8 0 rwobjpl 56 40430 0 35342 74 1 73 73 0 8 0 pdppl 4096 3230 0 3154 154 72 82 90 0 8 6 pvpl 32 741060 0 724301 359 114 245 359 0 265 80 pmappl 248 1610 0 1577 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 931 0 97 24 0 24 24 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff82c29ff0) 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(ffffffff82c793e8) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82c793e8) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff80002e418be0,ffff800000069c00) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff82c793e8) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82c793e8) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff80002e418d30,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+0x29 kd_curproc sys/dev/kcov.c:589 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x29 sys/dev/kcov.c:158 __mp_lock(ffffffff82c793e8) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82c793e8) at __mp_lock+0x133 sys/kern/kern_lock.c:147 sys_mmap(ffff80002121aab0,ffff80002e418fa0,ffff80002e418ff0) at sys_mmap+0x495 sys/uvm/uvm_mmap.c:287 syscall(ffff80002e419070) at syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002e419070) at syscall+0x606 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7a6e5051eb50, count: -14 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(ffff800027b60db8,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2510 [inline] witness_checkorder(ffff800027b60db8,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1110 mtx_enter(ffff800027b60da8) at mtx_enter+0x3e sys/kern/kern_lock.c:265 single_thread_set(ffff80002121b550,0,1) at single_thread_set+0x35a single_thread_wait sys/kern/kern_sig.c:2172 [inline] single_thread_set(ffff80002121b550,0,1) at single_thread_set+0x35a sys/kern/kern_sig.c:2155 sigexit(ffff80002121b550,6) at sigexit+0x90 sys/kern/kern_sig.c:1562 postsig(ffff80002121b550,6,ffff800021269228) at postsig+0x4a9 sys/kern/kern_sig.c:1494 userret(ffff80002121b550) at userret+0x16e sys/kern/kern_sig.c:1987 syscall(ffff800021269360) at syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] syscall(ffff800021269360) at syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa93554f520, count: -9