panic: kernel diagnostic assertion "__mp_lock_held(&sched_lock, curcpu()) == 0" failed: file "/syzkaller/managers/setuid/kernel/sys/kern/kern_lock.c", line 63 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *100303 78050 32767 0x1810 0x4080080 0 syz-executor.1 256980 3179 0 0x14000 0x200 1 zerothread db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff825a1086) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff82613da6,ffffffff82617104,3f,ffffffff8264968f) at __assert+0x25 sys/kern/subr_prf.c:161 _kernel_lock() at _kernel_lock+0xb2 sys/kern/kern_lock.c:63 single_thread_check_locked(ffff8000fffeca88,1,c) at single_thread_check_locked+0x1f6 sys/kern/kern_sig.c:2037 single_thread_check(ffff8000fffeca88,1) at single_thread_check+0x4b sys/kern/kern_sig.c:2057 sleep_finish(ffff80002e481d90,1) at sleep_finish+0x75 sleep_signal_check sys/kern/kern_synch.c:464 [inline] sleep_finish(ffff80002e481d90,1) at sleep_finish+0x75 sys/kern/kern_synch.c:400 rwsleep(ffff8000fffeca88,ffffffff8296a1a0,120,ffffffff82595f34,0) at rwsleep+0xd5 sys/kern/kern_synch.c:314 futex_wait(1518c5ba880,1,0,2) at futex_wait+0x13c sys/kern/sys_futex.c:260 sys_futex(ffff8000fffeca88,ffff80002e481f20,ffff80002e481f80) at sys_futex+0xf8 sys/kern/sys_futex.c:111 syscall(ffff80002e481ff0) at syscall+0x484 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e481ff0) at syscall+0x484 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x152263fa340, count: 3 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: kernel diagnostic assertion "__mp_lock_held(&sched_lock, curcpu()) == 0" failed: file "/syzkaller/managers/setuid/kernel/sys/kern/kern_lock.c", line 63 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff825a1086) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff82613da6,ffffffff82617104,3f,ffffffff8264968f) at __assert+0x25 sys/kern/subr_prf.c:161 _kernel_lock() at _kernel_lock+0xb2 sys/kern/kern_lock.c:63 single_thread_check_locked(ffff8000fffeca88,1,c) at single_thread_check_locked+0x1f6 sys/kern/kern_sig.c:2037 single_thread_check(ffff8000fffeca88,1) at single_thread_check+0x4b sys/kern/kern_sig.c:2057 sleep_finish(ffff80002e481d90,1) at sleep_finish+0x75 sleep_signal_check sys/kern/kern_synch.c:464 [inline] sleep_finish(ffff80002e481d90,1) at sleep_finish+0x75 sys/kern/kern_synch.c:400 rwsleep(ffff8000fffeca88,ffffffff8296a1a0,120,ffffffff82595f34,0) at rwsleep+0xd5 sys/kern/kern_synch.c:314 futex_wait(1518c5ba880,1,0,2) at futex_wait+0x13c sys/kern/sys_futex.c:260 sys_futex(ffff8000fffeca88,ffff80002e481f20,ffff80002e481f80) at sys_futex+0xf8 sys/kern/sys_futex.c:111 syscall(ffff80002e481ff0) at syscall+0x484 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e481ff0) at syscall+0x484 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x152263fa340, count: -12 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002e481b50 rbx 0xffffffff82989bb7 cpu_info_full_primary+0x2bb7 rdx 0 rcx 0 rax 0xffff8000fffeca88 r8 0x101010101010101 r9 0x8080808080808080 r10 0x888d1d6ff970c1f6 r11 0xe1d9131107426ebd r12 0xffffffff829899b8 cpu_info_full_primary+0x29b8 r13 0 r14 0 r15 0x1 rip 0xffffffff813e2898 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e481b40 ss 0 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=100303 stat=onproc flags process=1810 proc=4080080 pri=79, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffec008,0xffff8000fffed278 process=0xffff8000ffff1900 user=0xffff80002e47d000, vmspace=0xfffffd80677cb8b8 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 78050 84716 93803 32767 3 0x3810 suspend syz-executor.1 *78050 100303 93803 32767 7 0x4081890 syz-executor.1 78050 313960 93803 32767 2 0x4081810 syz-executor.1 36158 477104 71054 32767 3 0x90 nanoslp syz-executor.6 36158 185804 71054 32767 3 0x4000090 fsleep syz-executor.6 27346 333186 28805 32767 3 0x90 nanoslp syz-executor.3 27346 167029 28805 32767 3 0x4000090 netio syz-executor.3 27346 339085 28805 32767 3 0x4000090 fsleep syz-executor.3 27346 225052 28805 32767 3 0x4000090 fsleep syz-executor.3 43622 310359 64172 32767 3 0x90 nanoslp syz-executor.2 43622 4601 64172 32767 3 0x4000090 netcon syz-executor.2 43622 202009 64172 32767 3 0x4000090 netcon syz-executor.2 43622 265096 64172 32767 3 0x4000090 fsleep syz-executor.2 17573 465660 0 0 3 0x14200 bored sosplice 32538 419610 16152 32767 3 0x90 piperd syz-executor.7 71054 96451 4774 32767 3 0x90 nanoslp syz-executor.6 4774 246509 81719 0 3 0x82 wait syz-executor.6 16152 56888 81719 0 3 0x82 wait syz-executor.7 92015 98695 53159 32767 3 0x90 nanoslp syz-executor.4 7303 269796 65680 32767 3 0x90 piperd syz-executor.5 65680 132873 81719 0 3 0x82 wait syz-executor.5 64172 232233 29936 32767 3 0x90 nanoslp syz-executor.2 53159 502583 81719 0 3 0x82 wait syz-executor.4 28805 480069 10900 32767 3 0x90 nanoslp syz-executor.3 10900 76028 81719 0 3 0x82 wait syz-executor.3 29936 216852 81719 0 3 0x82 wait syz-executor.2 93803 232585 77053 32767 3 0x90 nanoslp syz-executor.1 77053 111282 81719 0 3 0x82 wait syz-executor.1 70111 383383 94642 32767 3 0x90 nanoslp syz-executor.0 94642 5461 81719 0 3 0x82 wait syz-executor.0 81719 12167 96157 0 3 0x82 thrsleep syz-fuzzer 81719 329211 96157 0 3 0x4000082 nanoslp syz-fuzzer 81719 372910 96157 0 3 0x4000082 thrsleep syz-fuzzer 81719 333771 96157 0 3 0x4000082 thrsleep syz-fuzzer 81719 9222 96157 0 3 0x4000082 thrsleep syz-fuzzer 81719 178702 96157 0 3 0x4000082 thrsleep syz-fuzzer 81719 238049 96157 0 3 0x4000082 kqread syz-fuzzer 81719 29630 96157 0 3 0x4000082 thrsleep syz-fuzzer 96157 309544 34799 0 3 0x10008a sigsusp ksh 34799 492664 17779 0 3 0x9a kqread sshd 8969 89737 1 0 3 0x100083 ttyin getty 17779 400811 1 0 3 0x88 kqread sshd 66015 260669 35012 73 3 0x1100090 kqread syslogd 35012 113887 1 0 3 0x100082 netio syslogd 55064 38093 1 0 3 0x100080 kqread resolvd 17089 83530 77988 77 3 0x100092 kqread dhcpleased 58972 272226 77988 77 3 0x100092 kqread dhcpleased 77988 346026 1 0 3 0x80 kqread dhcpleased 55879 325399 0 0 3 0x14200 bored smr 3179 256980 0 0 7 0x14200 zerothread 30345 377589 0 0 3 0x14200 aiodoned aiodoned 7711 42967 0 0 3 0x14200 syncer update 50914 119945 0 0 3 0x14200 cleaner cleaner 21140 148070 0 0 3 0x14200 reaper reaper 42769 462926 0 0 3 0x14200 pgdaemon pagedaemon 38811 331472 0 0 3 0x14200 bored viomb 68395 151058 0 0 3 0x40014200 acpi0 acpi0 42495 414665 0 0 3 0x40014200 idle1 40878 35104 0 0 3 0x14200 bored softnet 11601 400720 0 0 3 0x14200 bored softnet 42743 519535 0 0 3 0x14200 bored softnet 63909 523222 0 0 3 0x14200 bored softnet 60416 234156 0 0 3 0x14200 bored systqmp 25148 131334 0 0 3 0x14200 bored systq 33913 170959 0 0 3 0x40014200 bored softclock 69440 329368 0 0 3 0x40014200 idle0 1 455032 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive sched_lock &sched_lock r = 0 (0xffffffff82a153e0) #0 witness_lock+0x44d #1 __mp_acquire_count+0x48 sys/kern/kern_lock.c:227 #2 mi_switch+0x3d4 sys/kern/sched_bsd.c:419 #3 single_thread_check_locked+0x17f sys/kern/kern_sig.c:2045 #4 single_thread_check+0x4b sys/kern/kern_sig.c:2057 #5 sleep_finish+0x75 sleep_signal_check sys/kern/kern_synch.c:464 [inline] #5 sleep_finish+0x75 sys/kern/kern_synch.c:400 #6 rwsleep+0xd5 sys/kern/kern_synch.c:314 #7 futex_wait+0x13c sys/kern/sys_futex.c:260 #8 sys_futex+0xf8 sys/kern/sys_futex.c:111 #9 syscall+0x484 mi_syscall sys/sys/syscall_mi.h:102 [inline] #9 syscall+0x484 sys/arch/amd64/amd64/trap.c:585 #10 Xsyscall+0x128 CPU 1: exclusive mutex &uvm.fpageqlock r = 0 (0xffffffff82ba3868) #0 witness_lock+0x44d #1 mtx_enter_try+0x100 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 uvm_pagezero_thread+0x191 sys/uvm/uvm_pmemrange.c:2185 #4 proc_trampoline+0x1c ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10196 6410K 6420K 78643K 11287 0 pcb 13 10K 12K 78643K 15 0 rtable 242 6K 7K 78643K 401 0 ifaddr 81 16K 16K 78643K 82 0 counters 56 35K 35K 78643K 56 0 ioctlops 0 0K 2K 78643K 48 0 iov 0 0K 24K 78643K 297 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1271 79K 79K 78643K 1391 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 29 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 227 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 22 81K 121K 78643K 1455 0 proc 56 78K 115K 78643K 587 0 subproc 104 6K 6K 78643K 104 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 129 0 in_multi 99 6K 6K 78643K 120 0 ether_multi 1 0K 0K 78643K 6 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 175 784K 784K 78643K 175 0 exec 0 0K 2K 78643K 738 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 230 82K 86K 78643K 10062 0 UVM aobj 131 4K 4K 78643K 153 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 36 0 NDP 11 0K 2K 78643K 27 0 temp 124 4722K 4786K 78643K 6566 0 kqueue 12 18K 24K 78643K 161 0 SYN cache 2 16K 16K 78643K 2 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 120 148 0 145 3 0 3 3 0 8 2 rtentry 112 116 0 2 4 0 4 4 0 8 0 unpcb 136 1082 0 1069 11 8 3 7 0 8 2 syncache 296 36 0 36 5 4 1 1 0 8 1 tcpqe 32 37 0 37 4 3 1 1 0 8 1 tcpcb 736 1549 0 1514 36 27 9 18 0 8 5 arp 120 18 0 0 1 0 1 1 0 8 0 inpcb 320 2181 0 2155 15 8 7 12 0 8 4 ip6q 72 1 0 0 1 0 1 1 0 8 0 ip6af 40 1 0 0 1 0 1 1 0 8 0 nd6 48 29 0 1 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 468 0 2 30 0 30 30 0 8 0 art_table 32 469 0 2 4 0 4 4 0 8 0 art_node 16 115 0 11 1 0 1 1 0 8 0 sysvmsgpl 40 19 0 19 2 2 0 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 225 0 215 1 0 1 1 0 8 0 shmpl 112 150 0 22 5 1 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 3144 0 1710 91 0 91 91 0 8 0 ffsino 272 3144 0 1710 97 0 97 97 0 8 0 nchpl 144 5187 0 3508 63 0 63 63 0 8 0 uvmvnodes 80 3257 0 0 67 0 67 67 0 8 0 vnodes 224 3257 0 0 192 0 192 192 0 8 0 namei 1024 18003 0 18003 2 1 1 2 0 8 1 percpumem 16 40 0 0 1 0 1 1 0 8 0 kstatmem 264 22 0 0 2 0 2 2 0 8 0 scxspl 216 15256 0 15256 11 10 1 8 0 8 1 plimitpl 152 506 0 482 3 1 2 2 0 8 0 sigapl 424 1732 0 1679 7 0 7 7 0 8 0 futexpl 64 11823 0 11818 1 0 1 1 0 8 0 knotepl 120 372 0 0 12 0 12 12 0 8 0 kqueuepl 224 320 0 312 3 2 1 3 0 8 0 pipepl 336 276 0 248 5 2 3 5 0 8 0 fdescpl 496 1714 0 1681 7 2 5 6 0 8 0 filepl 152 10381 0 10132 27 12 15 21 0 8 5 lockfpl 104 369 0 367 1 0 1 1 0 8 0 lockfspl 48 75 0 73 1 0 1 1 0 8 0 sessionpl 144 23 0 7 1 0 1 1 0 8 0 pgrppl 48 36 0 20 1 0 1 1 0 8 0 ucredpl 104 1456 0 1438 1 0 1 1 0 8 0 zombiepl 144 1681 0 1679 1 0 1 1 0 8 0 processpl 1064 1732 0 1679 5 1 4 5 0 8 0 procpl 672 4354 0 4285 10 2 8 8 0 8 1 sosppl 168 7 0 7 2 2 0 1 0 8 0 sockpl 480 3498 0 3457 52 38 14 31 0 8 6 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 11 0 0 2 0 2 2 0 8 0 mcl12k 12288 8 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 8 0 0 1 0 1 1 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 155 0 0 19 0 19 19 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 463 0 0 27 0 27 27 0 8 0 bufpl 288 5632 0 141 393 0 393 393 0 8 0 anonpl 24 328038 0 315908 121 22 99 103 0 186 15 amapchunkpl 152 27941 0 27345 38 10 28 32 0 158 2 amappl16 200 4983 0 4630 46 18 28 32 0 8 8 amappl15 192 487 0 484 1 0 1 1 0 8 0 amappl14 184 332 0 324 1 0 1 1 0 8 0 amappl13 176 267 0 262 1 0 1 1 0 8 0 amappl12 168 3 0 3 1 1 0 1 0 8 0 amappl11 160 260 0 241 1 0 1 1 0 8 0 amappl10 152 208 0 201 1 0 1 1 0 8 0 amappl9 144 514 0 511 1 0 1 1 0 8 0 amappl8 136 749 0 691 3 0 3 3 0 8 0 amappl7 128 282 0 271 1 0 1 1 0 8 0 amappl6 120 221 0 204 2 0 2 2 0 8 0 amappl5 112 1285 0 1267 1 0 1 1 0 8 0 amappl4 104 1308 0 1277 2 1 1 2 0 8 0 amappl3 96 4522 0 4473 2 0 2 2 0 8 0 amappl2 88 2205 0 2139 3 1 2 3 0 8 0 amappl1 80 42665 0 41987 20 4 16 19 0 8 0 amappl 88 9595 0 9433 5 0 5 5 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 72 152 0 22 3 0 3 3 0 8 0 uaddrrnd 24 1714 0 1681 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1714 0 1681 1 0 1 1 0 8 0 vmmpekpl 168 17108 0 17058 3 0 3 3 0 8 0 vmmpepl 168 168681 0 166186 148 19 129 136 0 357 6 vmsppl 368 1713 0 1681 4 0 4 4 0 8 0 rwobjpl 56 46287 0 41600 68 0 68 68 0 8 0 pdppl 4096 3435 0 3362 120 39 81 93 0 8 8 pvpl 32 719206 0 702063 240 55 185 240 0 265 37 pmappl 248 1713 0 1681 4 1 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 840 0 71 22 0 22 22 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:437 panic(ffffffff825a1086) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff82613da6,ffffffff82617104,3f,ffffffff8264968f) at __assert+0x25 sys/kern/subr_prf.c:161 _kernel_lock() at _kernel_lock+0xb2 sys/kern/kern_lock.c:63 single_thread_check_locked(ffff8000fffeca88,1,c) at single_thread_check_locked+0x1f6 sys/kern/kern_sig.c:2037 single_thread_check(ffff8000fffeca88,1) at single_thread_check+0x4b sys/kern/kern_sig.c:2057 sleep_finish(ffff80002e481d90,1) at sleep_finish+0x75 sleep_signal_check sys/kern/kern_synch.c:464 [inline] sleep_finish(ffff80002e481d90,1) at sleep_finish+0x75 sys/kern/kern_synch.c:400 rwsleep(ffff8000fffeca88,ffffffff8296a1a0,120,ffffffff82595f34,0) at rwsleep+0xd5 sys/kern/kern_synch.c:314 futex_wait(1518c5ba880,1,0,2) at futex_wait+0x13c sys/kern/sys_futex.c:260 sys_futex(ffff8000fffeca88,ffff80002e481f20,ffff80002e481f80) at sys_futex+0xf8 sys/kern/sys_futex.c:111 syscall(ffff80002e481ff0) at syscall+0x484 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e481ff0) at syscall+0x484 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x152263fa340, count: -12 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020de8ff0) at x86_ipi_db+0x1a 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+0x23 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2f kd_curproc sys/dev/kcov.c:578 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2f sys/dev/kcov.c:148 __mp_lock(ffffffff82a151d8) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82a151d8) at __mp_lock+0x133 sys/kern/kern_lock.c:147 yield() at yield+0x36 sys/kern/sched_bsd.c:288 uvm_pagezero_thread(ffff800021242548) at uvm_pagezero_thread+0x6d sys/uvm/uvm_pmemrange.c:2170 end trace frame: 0x0, count: 8 ddb{1}> trace x86_ipi_db(ffff800020de8ff0) at x86_ipi_db+0x1a 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+0x23 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2f kd_curproc sys/dev/kcov.c:578 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2f sys/dev/kcov.c:148 __mp_lock(ffffffff82a151d8) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82a151d8) at __mp_lock+0x133 sys/kern/kern_lock.c:147 yield() at yield+0x36 sys/kern/sched_bsd.c:288 uvm_pagezero_thread(ffff800021242548) at uvm_pagezero_thread+0x6d sys/uvm/uvm_pmemrange.c:2170 end trace frame: 0x0, count: -7