login: uvm_fault(0xfffffd806c09b5d8, 0x7f87abcfe938, 0, 2) -> e kernel: page fault trap, code=2 Stopped at pmap_page_remove+0x45d: xchgq %rax,0(%r14,%rcx,1) TID PID UID PRFLAGS PFLAGS CPU COMMAND 159353 79049 60929 0x10 0 0 syz-executor pmap_page_remove(fffffd8007f5a310) at pmap_page_remove+0x45d _atomic_swap_64 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:117 [inline] pmap_page_remove(fffffd8007f5a310) at pmap_page_remove+0x45d sys/arch/amd64/amd64/pmap.c:2014 uvm_anfree_list(fffffd807e09b448,0) at uvm_anfree_list+0xd6 sys/uvm/uvm_anon.c:112 amap_wipeout(fffffd806bf341b8) at amap_wipeout+0x248 sys/uvm/uvm_amap.c:-1 uvm_unmap_detach(ffff80002a3a4d40,0) at uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353 uvm_map_teardown(fffffd806c09b5d8) at uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2525 exit1(ffff8000fffea020,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff8000fffea020,ffff80002a3a4f10,ffff80002a3a4e60) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a3a4f10) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a3a4f10) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77c4b1188d70, count: 6 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: uvm_fault(0xfffffd806c09b5d8, 0x7f87abcfe938, 0, 2) -> e ddb{1}> trace pmap_page_remove(fffffd8007f5a310) at pmap_page_remove+0x45d _atomic_swap_64 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:117 [inline] pmap_page_remove(fffffd8007f5a310) at pmap_page_remove+0x45d sys/arch/amd64/amd64/pmap.c:2014 uvm_anfree_list(fffffd807e09b448,0) at uvm_anfree_list+0xd6 sys/uvm/uvm_anon.c:112 amap_wipeout(fffffd806bf341b8) at amap_wipeout+0x248 sys/uvm/uvm_amap.c:-1 uvm_unmap_detach(ffff80002a3a4d40,0) at uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353 uvm_map_teardown(fffffd806c09b5d8) at uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2525 exit1(ffff8000fffea020,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff8000fffea020,ffff80002a3a4f10,ffff80002a3a4e60) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a3a4f10) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a3a4f10) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77c4b1188d70, count: -9 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a3a4c40 rbx 0xfffffd805e7df730 rdx 0 rcx 0x7f8000000000 rax 0 r8 0 r9 0xffff80002a3a4c30 r10 0xb9f1705ee4a321ea r11 0xd4592a0592f4b030 r12 0 r13 0 r14 0x7abcfe938 r15 0xfffffd8007f5a378 rip 0xffffffff827e277d pmap_page_remove+0x45d cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a3a4bc0 ss 0 pmap_page_remove+0x45d: xchgq %rax,0(%r14,%rcx,1) ddb{1}> show proc PROC (syz-executor) tid=192839 pid=11350 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff8000fffea020 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff8000fffeb248,0xffff8000fffebcb8 process=0xffff80003c4b0028 user=0xffff80002a39f000, vmspace=0xfffffd806c09b5d8 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 18687 182317 12991 0 2 0 syz-executor 18687 245021 12991 0 2 0x4000000 syz-executor 29234 374700 6477 0 2 0 syz-executor 29234 386636 6477 0 3 0x4000080 fsleep syz-executor 27891 87714 54674 0 2 0x2 ifconfig 54674 153330 37107 0 3 0x10008a sigsusp sh 90478 359501 57484 0 3 0x1000080 nanoslp syz-executor 90478 176438 57484 0 3 0x5000080 lockf syz-executor 90478 322718 57484 0 3 0x5000080 fsleep syz-executor 37107 67046 17721 0 3 0x82 wait syz-executor 79049 159353 28632 60929 7 0x10 syz-executor 79049 401666 28632 60929 2 0x4000010 syz-executor 79049 333251 28632 60929 3 0x4000090 fsleep syz-executor 80425 2572 59361 0 3 0x80 nanoslp syz-executor 80425 194767 59361 0 3 0x4000080 sbwait syz-executor 80425 184447 59361 0 3 0x4000080 fsleep syz-executor 706 569 1 0 3 0x100083 ttyin getty 30490 44001 0 0 3 0x14200 acct acct 6991 15683 0 0 3 0x14280 nfsidl nfsio 70686 373119 0 0 3 0x14280 nfsidl nfsio 68853 338175 0 0 3 0x14280 nfsidl nfsio 57102 189015 0 0 3 0x14280 nfsidl nfsio 57484 505739 17721 0 2 0x2 syz-executor 6168 413064 17721 0 3 0x82 nanoslp syz-executor 12991 198589 17721 0 3 0x82 nanoslp syz-executor 19716 236653 52761 0 3 0x100082 sbwait ndp 52761 195569 1 0 3 0x10008a sigsusp sh 59361 377328 17721 0 3 0x82 nanoslp syz-executor 28632 183222 17721 0 3 0x82 nanoslp syz-executor 92505 122607 17721 0 2 0x2 syz-executor 6477 251844 17721 0 3 0x82 nanoslp syz-executor 17721 499348 51222 0 3 0x82 kqread syz-executor 51222 325743 74866 0 3 0x10008a sigsusp ksh 74866 369701 27604 0 3 0x98 kqread sshd-session 27604 355305 4866 0 3 0x92 kqread sshd-session 4866 440904 1 0 3 0x88 kqread sshd 87491 372943 37352 74 3 0x1100092 bpf pflogd 37352 309525 1 0 3 0x80 sbwait pflogd 33756 248244 21537 73 3 0x1100090 kqread syslogd 21537 190971 1 0 3 0x100082 sbwait syslogd 46150 408692 1 0 3 0x100080 kqread resolvd 35584 475553 65844 77 2 0x100012 dhcpleased 40797 127078 65844 77 3 0x100092 kqread dhcpleased 65844 347004 1 0 3 0x80 kqread dhcpleased 13028 15250 0 0 3 0x14200 bored smr 16326 446091 0 0 2 0x14200 zerothread 48110 310819 0 0 3 0x14200 aiodoned aiodoned 68934 58940 0 0 3 0x14200 syncer update 36782 299314 0 0 3 0x14200 cleaner cleaner 39045 193029 0 0 3 0x14200 reaper reaper 56674 248007 0 0 3 0x14200 pgdaemon pagedaemon 53319 99174 0 0 3 0x14200 bored viomb 95043 287115 0 0 3 0x40014200 acpi0 acpi0 31483 497730 0 0 3 0x40014200 idle1 3343 313276 0 0 3 0x14200 bored softnet1 94189 63619 0 0 3 0x14200 bored softnet0 83174 401385 0 0 3 0x14200 bored systqmp 28721 328371 0 0 3 0x14200 bored systq 92583 369431 0 0 3 0x14200 tmoslp softclockmp 82708 365223 0 0 3 0x40014200 tmoslp softclock 41283 487988 0 0 3 0x40014200 idle0 1 417090 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd806c09ac10) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487 #2 pmap_page_remove+0xca rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline] #2 pmap_page_remove+0xca pmap_map_ptes sys/arch/amd64/amd64/pmap.c:437 [inline] #2 pmap_page_remove+0xca sys/arch/amd64/amd64/pmap.c:1974 #3 uvm_anfree_list+0xd6 sys/uvm/uvm_anon.c:112 #4 amap_wipeout+0x248 sys/uvm/uvm_amap.c:-1 #5 uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353 #6 uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2525 #7 exit1+0x6fc sys/kern/kern_exit.c:260 #8 sys_exit+0x1a sys/kern/kern_exit.c:-1 #9 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 #10 Xsyscall+0x128 Process 92505 (syz-executor) thread 0xffff8000ffffcd00 (122607) exclusive rwlock vmmaplk r = 0 (0xfffffd806c218118) #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_map_lock_ln+0x12e sys/uvm/uvm_map.c:5171 #3 uvmspace_fork+0x12b sys/uvm/uvm_map.c:3741 #4 process_new+0x577 sys/kern/kern_fork.c:281 #5 fork1+0x3f6 sys/kern/kern_fork.c:-1 #6 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 #7 Xsyscall+0x128 exclusive rwlock vmmaplk r = 0 (0xfffffd800b027e58) #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_map_lock_ln+0x12e sys/uvm/uvm_map.c:5171 #3 uvmspace_fork+0x44 sys/uvm/uvm_map.c:3732 #4 process_new+0x577 sys/kern/kern_fork.c:281 #5 fork1+0x3f6 sys/kern/kern_fork.c:-1 #6 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 #7 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10235 11123K 11819K 166960K 13874 0 pcb 17 16K 21K 166960K 618 0 rtable 227 13K 14K 166960K 971 0 pf 39 18K 67487K 166960K 285 0 ifaddr 38 7K 8K 166960K 166 0 ifgroup 58 2K 3K 166960K 302 0 sysctl 4 1K 9K 166960K 90 0 counters 68 36K 38K 166960K 456 0 ioctlops 0 0K 5K 166960K 2083 0 iov 0 0K 24K 166960K 123 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1492 94K 94K 166960K 3739 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 2K 10K 166960K 35 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 170 0 dirhash 12 2K 2K 166960K 42 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 20 73K 240K 166960K 2057 0 sigio 0 0K 0K 166960K 47 0 proc 80 131K 180K 166960K 851 0 subproc 81 5K 5K 166960K 109 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 524 0 in_multi 72 5K 7K 166960K 224 0 ether_multi 1 0K 0K 166960K 22 0 mrt 1 0K 0K 166960K 24 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 577 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 249 171K 185K 166960K 20489 0 UVM aobj 226 29K 29K 166960K 231 0 pinsyscall 46 92K 106K 166960K 3283 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 224 0 NDP 12 0K 2K 166960K 113 0 temp 81 8660K 8916K 166960K 90415 0 kqueue 14 22K 30K 166960K 422 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 120 244 0 240 2 1 1 2 0 8 0 rtentry 176 283 0 202 6 0 6 6 0 8 0 unpcb 144 1637 0 1618 18 16 2 6 0 8 1 syncache 336 8 0 8 3 2 1 1 0 8 1 tcpqe 32 4 0 4 2 1 1 1 0 8 1 tcpcb 736 826 0 821 21 19 2 7 0 8 1 arp 136 37 0 23 1 0 1 1 0 8 0 inpcb 328 2428 0 2419 31 29 2 15 0 8 0 nd6 152 35 0 19 1 0 1 1 0 8 0 pkpcb 40 13 0 13 6 6 0 1 0 8 0 kcovpl 48 12 0 3 1 0 1 1 0 8 0 mppekey 1024 2 0 2 2 2 0 1 0 8 0 ppxss 1192 165 0 165 2 1 1 1 0 8 1 pppxif 1504 16 0 16 4 3 1 1 0 8 1 pfstscr 40 2 0 1 1 0 1 1 0 8 0 pffrag 232 34 0 22 2 1 1 2 0 482 0 pffrnode 88 20 0 9 1 0 1 1 0 8 0 pffrent 40 126 0 113 1 0 1 1 0 8 0 pfosfp 40 1429 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1429 0 714 21 0 21 21 0 8 0 pfrktable 1344 4 0 4 1 1 0 1 0 8 0 pfanchor 1288 2 0 2 1 1 0 1 0 8 0 pftag 88 2 0 2 1 1 0 1 0 8 0 pfstitem 24 147 0 68 1 0 1 1 0 8 0 pfstkey 128 154 0 75 3 0 3 3 0 8 0 pfstate 384 147 0 72 8 0 8 8 0 8 0 pfrule 1344 25 0 20 2 1 1 2 0 8 0 rttmr 136 4 0 4 4 4 0 1 0 8 0 art_heap8 4096 8 0 2 7 1 6 7 0 8 0 art_heap4 256 901 0 560 38 12 26 32 0 8 2 art_table 40 909 0 562 6 1 5 6 0 8 0 art_node 32 278 0 211 2 1 1 2 0 8 0 sysvmsgpl 40 8 0 4 1 0 1 1 0 8 0 semupl 112 3 0 3 2 2 0 1 0 8 0 semapl 112 162 0 152 1 0 1 1 0 8 0 shmpl 112 215 0 3 7 0 7 7 0 8 0 dirhash 1024 37 0 20 3 0 3 3 0 8 0 dino2pl 256 5594 0 4083 96 0 96 96 0 8 0 ffsino 296 5594 0 4083 117 0 117 117 0 8 0 nchpl 144 8413 0 6702 64 0 64 64 0 8 0 rtmask 32 21 0 21 6 6 0 1 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 30154 0 30153 3 2 1 2 0 8 0 percpumem 16 243 0 194 1 0 1 1 0 8 0 vcpupl 3968 13 0 2 2 0 2 2 0 8 0 vmpool 840 13 0 2 2 0 2 2 0 8 0 pfiaddrpl 120 1 0 1 1 1 0 1 0 8 0 kstatmem 264 186 0 158 4 1 3 3 0 8 0 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 9 0 9 4 4 0 1 0 8 0 scxspl 216 51388 0 51388 13 11 2 8 1 8 2 plimitpl 152 591 0 570 2 1 1 2 0 8 0 sigapl 424 2390 0 2334 9 0 9 9 0 8 0 knotepl 120 737 0 0 22 0 22 22 0 8 0 kqueuepl 224 868 0 858 12 10 2 5 0 8 1 pipepl 344 430 0 400 15 11 4 9 0 8 1 fdescpl 528 2330 0 2296 3 0 3 3 0 8 0 filepl 160 17744 0 17516 38 25 13 21 0 8 1 lockfpl 104 908 0 904 2 1 1 2 0 8 0 lockfspl 48 367 0 364 1 0 1 1 0 8 0 sessionpl 144 35 0 26 1 0 1 1 0 8 0 pgrppl 48 114 0 96 1 0 1 1 0 8 0 ucredpl 104 3472 0 3458 1 0 1 1 0 8 0 zombiepl 144 2778 0 2777 1 0 1 1 0 8 0 processpl 1232 2390 0 2334 6 0 6 6 0 8 0 procpl 664 5706 0 5642 9 1 8 8 0 8 0 sosppl 176 14 0 14 3 2 1 1 0 8 1 sockpl 752 4384 0 4352 49 43 6 20 0 8 1 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 115 0 0 14 0 14 14 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 58 0 0 6 1 5 5 0 8 0 mtagpl 96 7 0 0 1 0 1 1 0 8 0 mbufpl 256 1449 0 0 91 0 91 91 0 8 0 bufpl 280 19944 0 13807 439 0 439 439 0 8 0 anonpl 32 12327 0 0 100 0 100 100 0 246 0 amapchunkpl 152 71321 0 70812 62 29 33 36 0 158 8 amappl16 200 7619 0 7589 59 43 16 26 0 8 7 amappl15 192 5 0 4 1 0 1 1 0 8 0 amappl14 184 6 0 6 1 1 0 1 0 8 0 amappl13 176 463 0 460 1 0 1 1 0 8 0 amappl12 168 2732 0 2687 3 0 3 3 0 8 0 amappl11 160 4 0 4 2 2 0 1 0 8 0 amappl10 152 53 0 38 1 0 1 1 0 8 0 amappl9 144 353 0 353 1 1 0 1 0 8 0 amappl8 136 33 0 30 1 0 1 1 0 8 0 amappl7 128 94 0 91 1 0 1 1 0 8 0 amappl6 120 329 0 311 1 0 1 1 0 8 0 amappl5 112 87 0 76 1 0 1 1 0 8 0 amappl4 104 466 0 435 1 0 1 1 0 8 0 amappl3 96 12475 0 12380 4 1 3 3 0 8 0 amappl2 88 2471 0 2389 3 0 3 3 0 8 1 amappl1 80 18103 0 17477 15 0 15 15 0 8 1 amappl 88 19332 0 19168 5 0 5 5 0 92 0 uvmvnodes 80 172 0 0 4 0 4 4 0 8 0 dma16384 16384 1 0 1 1 1 0 1 0 8 0 dma4096 4096 2 0 2 2 2 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 7 0 7 2 2 0 1 0 8 0 dma128 128 255 0 255 3 3 0 1 0 8 0 dma64 64 8 0 8 2 2 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 19 0 18 1 0 1 1 0 8 0 aobjpl 72 230 0 5 5 0 5 5 0 8 0 uaddrrnd 24 2330 0 2296 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2330 0 2296 1 0 1 1 0 8 0 vmmpekpl 168 20380 0 20331 3 0 3 3 0 8 0 vmmpepl 168 151706 0 149722 129 26 103 110 0 357 4 vmsppl 488 2329 0 2295 5 0 5 5 0 8 0 rwobjpl 80 41079 0 39689 43 8 35 36 0 8 0 pdppl 4096 4694 0 4605 141 51 90 90 0 8 1 pvpl 32 20678 0 0 166 0 166 166 0 265 0 pmappl 256 2342 0 2297 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 437 0 95 10 0 10 10 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837d2ff0) 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 end of kernel end trace frame: 0x70ab66fbc4f0, count: 12 ddb{0}> trace x86_ipi_db(ffffffff837d2ff0) 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 end of kernel end trace frame: 0x70ab66fbc4f0, count: -3 ddb{0}> machine ddbcpu 1 Stopped at pmap_page_remove+0x45d: xchgq %rax,0(%r14,%rcx,1) pmap_page_remove(fffffd8007f5a310) at pmap_page_remove+0x45d _atomic_swap_64 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:117 [inline] pmap_page_remove(fffffd8007f5a310) at pmap_page_remove+0x45d sys/arch/amd64/amd64/pmap.c:2014 uvm_anfree_list(fffffd807e09b448,0) at uvm_anfree_list+0xd6 sys/uvm/uvm_anon.c:112 amap_wipeout(fffffd806bf341b8) at amap_wipeout+0x248 sys/uvm/uvm_amap.c:-1 uvm_unmap_detach(ffff80002a3a4d40,0) at uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353 uvm_map_teardown(fffffd806c09b5d8) at uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2525 exit1(ffff8000fffea020,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff8000fffea020,ffff80002a3a4f10,ffff80002a3a4e60) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a3a4f10) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a3a4f10) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77c4b1188d70, count: 6 ddb{1}> trace pmap_page_remove(fffffd8007f5a310) at pmap_page_remove+0x45d _atomic_swap_64 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:117 [inline] pmap_page_remove(fffffd8007f5a310) at pmap_page_remove+0x45d sys/arch/amd64/amd64/pmap.c:2014 uvm_anfree_list(fffffd807e09b448,0) at uvm_anfree_list+0xd6 sys/uvm/uvm_anon.c:112 amap_wipeout(fffffd806bf341b8) at amap_wipeout+0x248 sys/uvm/uvm_amap.c:-1 uvm_unmap_detach(ffff80002a3a4d40,0) at uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353 uvm_map_teardown(fffffd806c09b5d8) at uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2525 exit1(ffff8000fffea020,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff8000fffea020,ffff80002a3a4f10,ffff80002a3a4e60) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a3a4f10) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a3a4f10) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77c4b1188d70, count: -9