witness: lock order reversal: 1st 0xffffffff82cc8bd0 &sched_lock (&sched_lock) 2nd 0xffff80002121de70 &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(ffff80002121de70,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2510 [inline] witness_checkorder(ffff80002121de70,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1110 mtx_enter(ffff80002121de60) at mtx_enter+0x3e sys/kern/kern_lock.c:265 single_thread_set(ffff8000211ef2a8,0,1) at single_thread_set+0x35a single_thread_wait sys/kern/kern_sig.c:2172 [inline] single_thread_set(ffff8000211ef2a8,0,1) at single_thread_set+0x35a sys/kern/kern_sig.c:2155 sigexit(ffff8000211ef2a8,6) at sigexit+0x90 sys/kern/kern_sig.c:1562 postsig(ffff8000211ef2a8,6,ffff80002ca09d38) at postsig+0x4a9 sys/kern/kern_sig.c:1494 userret(ffff8000211ef2a8) at userret+0x16e sys/kern/kern_sig.c:1987 syscall(ffff80002ca09e70) at syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] syscall(ffff80002ca09e70) at syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x26f0e68f1a0, count: -9 ddb{1}> show registers rdi 0x3 rsi 0xffffffff82bf22f0 __sancov_gen_cov_switch_values.134 rbp 0xffff80002ca09a40 rbx 0x3 rdx 0 rcx 0xffff8000211ef2a8 rax 0xffff800020d58ff0 r8 0xffff80002ca099b0 r9 0x8080808080808080 r10 0x40306871e76bfea1 r11 0x5e3a983bfe4a4eeb r12 0xfffffd8003a0a2d0 r13 0 r14 0xfffffd80039f58d0 r15 0xfffffd80031c7bc0 rip 0xffffffff81b6e27c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff80002ca09a30 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.2) pid=8917 stat=onproc flags process=500010 proc=4002000 pri=32, usrpri=61, nice=20 forw=0xffffffffffffffff, list=0xffff80002121b7f0,0xffffffff82c90e98 process=0xffff80002121dd60 user=0xffff80002ca04000, vmspace=0xfffffd8008a12740 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 61999 423248 75169 32767 4 0x582010 syz-executor.2 61999 50196 75169 32767 4 0x4580090 fsleep syz-executor.2 *61999 8917 75169 32767 7 0x4502010 syz-executor.2 63872 219527 54542 32767 7 0x10 syz-executor.7 63872 51440 54542 32767 2 0x4000010 syz-executor.7 20734 318625 14912 32767 2 0x10 syz-executor.0 20734 175007 14912 32767 3 0x4000090 fsleep syz-executor.0 20734 521309 14912 32767 3 0x4000090 fsleep syz-executor.0 39928 202204 13753 32767 2 0x10 syz-executor.1 39928 228233 13753 32767 3 0x4000090 fsleep syz-executor.1 39928 502139 13753 32767 3 0x4000090 fsleep syz-executor.1 14912 348651 1796 32767 3 0x90 nanoslp syz-executor.0 1796 164497 59516 0 3 0x82 wait syz-executor.0 75169 400640 51260 32767 3 0x90 nanoslp syz-executor.2 51260 249550 59516 0 3 0x82 wait syz-executor.2 78670 404246 21140 32767 3 0x90 nanoslp syz-executor.3 21140 132424 59516 0 3 0x82 wait syz-executor.3 13753 319917 17021 32767 3 0x90 nanoslp syz-executor.1 17021 239811 59516 0 3 0x82 wait syz-executor.1 54542 23197 70416 32767 3 0x90 nanoslp syz-executor.7 70416 4059 59516 0 3 0x82 wait syz-executor.7 24285 75325 39651 32767 3 0x10 biowait syz-executor.4 39651 36617 59516 0 3 0x82 wait syz-executor.4 58079 396704 33620 32767 3 0x90 nanoslp syz-executor.5 33620 219334 59516 0 3 0x82 wait syz-executor.5 99222 247575 0 0 3 0x14200 bored sosplice 52652 220810 26339 32767 3 0x90 nanoslp syz-executor.6 26339 344812 59516 0 3 0x82 wait syz-executor.6 59516 219931 56308 0 3 0x2000082 thrsleep syz-fuzzer 59516 231250 56308 0 3 0x6000082 nanoslp syz-fuzzer 59516 55616 56308 0 3 0x6000082 thrsleep syz-fuzzer 59516 296346 56308 0 3 0x6000082 wait syz-fuzzer 59516 348225 56308 0 3 0x6000082 thrsleep syz-fuzzer 59516 262349 56308 0 3 0x6000082 thrsleep syz-fuzzer 59516 250825 56308 0 3 0x6000082 wait syz-fuzzer 59516 243205 56308 0 3 0x6000082 wait syz-fuzzer 59516 153117 56308 0 3 0x6000082 wait syz-fuzzer 59516 82884 56308 0 3 0x6000082 thrsleep syz-fuzzer 59516 522788 56308 0 3 0x6000082 thrsleep syz-fuzzer 59516 125370 56308 0 3 0x6000082 wait syz-fuzzer 59516 409691 56308 0 3 0x6000082 kqread syz-fuzzer 59516 30477 56308 0 3 0x6000082 wait syz-fuzzer 59516 463663 56308 0 3 0x6000082 wait syz-fuzzer 59516 167288 56308 0 3 0x6000082 wait syz-fuzzer 56308 321753 35279 0 3 0x10008a sigsusp ksh 35279 307619 1584 0 3 0x9a kqread sshd 36350 49466 1 0 3 0x100083 ttyin getty 1584 203841 1 0 3 0x88 kqread sshd 8219 230259 62874 73 3 0x1100090 kqread syslogd 62874 132884 1 0 3 0x100082 netio syslogd 71024 90886 1 0 3 0x100080 kqread resolvd 40640 501219 12302 77 3 0x100092 kqread dhcpleased 33922 419610 12302 77 3 0x100092 kqread dhcpleased 12302 144455 1 0 3 0x80 kqread dhcpleased 42435 31966 0 0 3 0x14200 bored smr 46371 447656 0 0 2 0x14200 zerothread 71495 133555 0 0 3 0x14200 aiodoned aiodoned 51265 443815 0 0 3 0x14200 syncer update 89459 30591 0 0 3 0x14200 cleaner cleaner 80567 41282 0 0 3 0x14200 reaper reaper 82114 189384 0 0 3 0x14200 pgdaemon pagedaemon 48120 135812 0 0 3 0x14200 bored viomb 7190 87125 0 0 3 0x40014200 acpi0 acpi0 32868 135758 0 0 3 0x40014200 idle1 89446 48358 0 0 3 0x14200 bored softnet3 78561 203542 0 0 3 0x14200 bored softnet2 42226 119652 0 0 3 0x14200 bored softnet1 17839 50403 0 0 3 0x14200 bored softnet0 62470 481585 0 0 3 0x14200 bored systqmp 3312 10677 0 0 3 0x14200 bored systq 3711 249953 0 0 3 0x40014200 bored softclock 1720 311060 0 0 3 0x40014200 idle0 1 399520 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive mutex &uvm.fpageqlock r = 0 (0xffffffff82cc9298) #0 witness_lock+0x447 #1 mtx_enter_try+0x104 #2 mtx_enter+0x4f sys/kern/kern_lock.c:266 #3 uvm_pmr_getpages+0xeac sys/uvm/uvm_pmemrange.c:1205 #4 uvm_pagealloc+0x1a8 sys/uvm/uvm_page.c:910 #5 uvm_fault_lower+0x1ab #6 uvm_fault+0x238 #7 upageflttrap+0x86 sys/arch/amd64/amd64/trap.c:188 #8 usertrap+0x226 sys/arch/amd64/amd64/trap.c:436 #9 recall_trap+0x8 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 61999 (syz-executor.2) thread 0xffff8000211ef2a8 (8917) 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 63872 (syz-executor.7) thread 0xffff800021263808 (219527) exclusive rwlock amaplk r = 0 (0xfffffd8069263d68) #0 witness_lock+0x447 #1 uvm_fault_check+0x41a sys/uvm/uvm_fault.c:782 #2 uvm_fault+0xf2 sys/uvm/uvm_fault.c:600 #3 upageflttrap+0x86 sys/arch/amd64/amd64/trap.c:188 #4 usertrap+0x226 sys/arch/amd64/amd64/trap.c:436 #5 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd806ba7a110) #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 Process 24285 (syz-executor.4) thread 0xffff800021286800 (75325) exclusive rrwlock inode r = 0 (0xfffffd806d5f5818) #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 (0xfffffd806baac818) #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 11325 0 pcb 13 12K 14K 78643K 17 0 rtable 244 6K 7K 78643K 1326 0 pf 29 8K 8K 78643K 67 0 ifaddr 44 15K 15K 78643K 124 0 ifgroup 50 2K 2K 78643K 126 0 sysctl 3 1K 1K 78643K 3 0 counters 60 35K 35K 78643K 98 0 ioctlops 0 0K 2K 78643K 186 0 iov 0 0K 16K 78643K 1009 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1279 80K 80K 78643K 2841 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 874 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 2541 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 22 81K 109K 78643K 13591 0 sigio 0 0K 0K 78643K 332 0 proc 56 78K 115K 78643K 1841 0 subproc 104 6K 6K 78643K 351 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 1740 0 in_multi 99 7K 7K 78643K 398 0 ether_multi 1 0K 0K 78643K 15 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 79 360K 360K 78643K 79 0 exec 0 0K 1K 78643K 2536 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 438 97K 107K 78643K 133562 0 UVM aobj 131 4K 5K 78643K 140 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 248 0 NDP 11 0K 2K 78643K 84 0 temp 74 5920K 6000K 78643K 35139 0 kqueue 12 18K 36K 78643K 1326 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 120 534 0 531 7 6 1 3 0 8 0 rtentry 112 344 0 229 4 0 4 4 0 8 0 unpcb 144 8774 0 8761 75 74 1 8 0 8 0 syncache 304 147 0 147 22 21 1 1 0 8 1 tcpqe 32 513 0 513 20 20 0 1 0 8 0 tcpcb 808 7309 0 7295 126 121 5 16 0 8 2 arp 120 59 0 41 1 0 1 1 0 8 0 ipq 40 17 0 16 6 5 1 1 0 8 0 ipqe 40 93 0 89 6 5 1 1 0 8 0 inpcb 368 11972 0 11955 130 125 5 15 0 8 0 nd6 136 102 0 73 3 1 2 2 0 8 0 kcovpl 48 27 0 19 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1381 0 909 34 4 30 31 0 8 0 art_table 32 1382 0 909 4 0 4 4 0 8 0 art_node 16 343 0 238 1 0 1 1 0 8 0 semapl 112 2539 0 2529 1 0 1 1 0 8 0 shmpl 112 137 0 9 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 19510 0 18061 92 0 92 92 0 8 0 ffsino 272 19510 0 18061 98 0 98 98 0 8 0 nchpl 144 38173 0 36532 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 130060 0 130059 7 6 1 2 0 8 0 percpumem 16 62 0 19 1 0 1 1 0 8 0 kstatmem 264 60 0 38 2 0 2 2 0 8 0 scxspl 216 107398 0 107397 47 46 1 8 1 8 0 plimitpl 152 1566 0 1542 12 11 1 2 0 8 0 sigapl 424 13836 0 13782 7 0 7 7 0 8 0 futexpl 64 116141 0 116136 1 0 1 1 0 8 0 knotepl 120 792 0 0 11 1 10 10 0 8 0 kqueuepl 216 3540 0 3532 67 66 1 5 0 8 0 pipepl 320 3417 0 3389 80 77 3 13 0 8 0 fdescpl 496 13818 0 13785 7 2 5 6 0 8 0 filepl 152 87001 0 86768 122 112 10 19 0 8 0 lockfpl 104 1628 0 1626 2 1 1 2 0 8 0 lockfspl 48 523 0 521 1 0 1 1 0 8 0 sessionpl 144 42 0 26 1 0 1 1 0 8 0 pgrppl 48 1297 0 1281 1 0 1 1 0 8 0 ucredpl 104 8457 0 8439 1 0 1 1 0 8 0 zombiepl 144 13785 0 13782 1 0 1 1 0 8 0 processpl 1072 13836 0 13782 4 0 4 4 0 8 0 procpl 680 37114 0 37038 22 14 8 8 0 8 0 sosppl 168 135 0 135 11 11 0 1 0 8 0 sockpl 488 22012 0 21979 380 372 8 31 0 8 2 mcl64k 65536 25 0 0 3 0 3 3 0 8 0 mcl16k 16384 25 0 0 4 1 3 3 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 19 0 0 2 0 2 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 51 0 0 5 1 4 4 0 8 0 mcl2k2 2112 14 0 0 1 0 1 1 0 8 0 mcl2k 2048 420 0 0 34 14 20 34 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 1397 0 0 78 0 78 78 0 8 0 bufpl 288 21763 0 15438 453 0 453 453 0 8 0 anonpl 24 1337253 0 1325836 166 74 92 100 0 186 0 amapchunkpl 152 421079 0 420197 111 73 38 48 0 158 0 amappl16 200 26694 0 26391 156 139 17 29 0 8 0 amappl15 192 26 0 23 1 0 1 1 0 8 0 amappl14 184 207 0 190 2 1 1 2 0 8 0 amappl13 176 12 0 12 2 2 0 1 0 8 0 amappl12 168 14752 0 14713 2 0 2 2 0 8 0 amappl11 160 55 0 44 1 0 1 1 0 8 0 amappl10 152 62 0 47 1 0 1 1 0 8 0 amappl9 144 257 0 256 1 0 1 1 0 8 0 amappl8 136 806 0 642 6 0 6 6 0 8 0 amappl7 128 129 0 113 2 0 2 2 0 8 0 amappl6 120 503 0 474 2 1 1 2 0 8 0 amappl5 112 524 0 515 1 0 1 1 0 8 0 amappl4 104 890 0 847 6 4 2 2 0 8 0 amappl3 96 83280 0 83186 12 9 3 4 0 8 0 amappl2 88 14569 0 14488 3 1 2 3 0 8 0 amappl1 80 57029 0 56503 22 10 12 22 0 8 0 amappl 88 132432 0 132170 8 1 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 72 139 0 9 3 0 3 3 0 8 0 uaddrrnd 24 13818 0 13785 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 13818 0 13785 1 0 1 1 0 8 0 vmmpekpl 168 103533 0 103469 6 2 4 4 0 8 0 vmmpepl 168 800948 0 798518 266 150 116 127 0 357 2 vmsppl 464 13817 0 13785 6 1 5 5 0 8 0 rwobjpl 56 199897 0 192399 120 12 108 109 0 8 0 pdppl 4096 27644 0 27570 522 440 82 88 0 8 8 pvpl 32 3812852 0 3795164 414 252 162 334 0 265 0 pmappl 248 13817 0 13785 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1618 0 728 27 0 27 27 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc wakeup_n(ffffffff82cc9104,ffffffff) at wakeup_n+0x37 sys/kern/kern_synch.c:541 uvm_pmr_getpages(1,0,0,1,0,1,74bc066ba5e26ea,fffffd8069b339a8) at uvm_pmr_getpages+0xeef sys/uvm/uvm_pmemrange.c:1207 uvm_pagealloc(0,0,fffffd8069b339a8,2) at uvm_pagealloc+0x1a8 sys/uvm/uvm_page.c:910 uvm_fault_lower(ffff80002c9ebac0,ffff80002c9ebaf8,ffff80002c9eba40,0) at uvm_fault_lower+0x1ab uvm_fault(fffffd806ba7a018,2f60d7a5000,0,2) at uvm_fault+0x238 upageflttrap(ffff80002c9ebc40,2f60d7a5000) at upageflttrap+0x86 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff80002c9ebc40) at usertrap+0x226 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x6f9c1814ad20, count: -12 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(ffff80002121de70,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2510 [inline] witness_checkorder(ffff80002121de70,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1110 mtx_enter(ffff80002121de60) at mtx_enter+0x3e sys/kern/kern_lock.c:265 single_thread_set(ffff8000211ef2a8,0,1) at single_thread_set+0x35a single_thread_wait sys/kern/kern_sig.c:2172 [inline] single_thread_set(ffff8000211ef2a8,0,1) at single_thread_set+0x35a sys/kern/kern_sig.c:2155 sigexit(ffff8000211ef2a8,6) at sigexit+0x90 sys/kern/kern_sig.c:1562 postsig(ffff8000211ef2a8,6,ffff80002ca09d38) at postsig+0x4a9 sys/kern/kern_sig.c:1494 userret(ffff8000211ef2a8) at userret+0x16e sys/kern/kern_sig.c:1987 syscall(ffff80002ca09e70) at syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] syscall(ffff80002ca09e70) at syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x26f0e68f1a0, count: -9