panic: kernel diagnostic assertion "uvm_page_owner_locked_p(pg)" failed: file "/syzkaller/managers/main/kernel/sys/uvm/uvm_page.c", line 1268 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *324753 27467 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff82430ddb) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff8249da19,ffffffff82453bb9,4f4,ffffffff82453bec) at __assert+0x25 sys/kern/subr_prf.c:161 uvm_pageunwire(fffffd800658ff80) at uvm_pageunwire+0x19b sys/uvm/uvm_page.c:1268 uvm_fault_unwire_locked(fffffd806aeab340,1aec7665000,1aec7864000) at uvm_fault_unwire_locked+0x23b sys/uvm/uvm_fault.c:1654 uvm_unmap_kill_entry_withlock(fffffd806aeab340,fffffd806847ed50,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:2135 uvm_map_teardown(fffffd806aeab340) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd806aeab340) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2771 uvmspace_free(fffffd806aeab340) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3685 reaper(ffff8000fffff7a0) at reaper+0x15e sys/kern/kern_exit.c:462 end trace frame: 0x0, 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: kernel diagnostic assertion "uvm_page_owner_locked_p(pg)" failed: file "/syzkaller/managers/main/kernel/sys/uvm/uvm_page.c", line 1268 ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff82430ddb) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff8249da19,ffffffff82453bb9,4f4,ffffffff82453bec) at __assert+0x25 sys/kern/subr_prf.c:161 uvm_pageunwire(fffffd800658ff80) at uvm_pageunwire+0x19b sys/uvm/uvm_page.c:1268 uvm_fault_unwire_locked(fffffd806aeab340,1aec7665000,1aec7864000) at uvm_fault_unwire_locked+0x23b sys/uvm/uvm_fault.c:1654 uvm_unmap_kill_entry_withlock(fffffd806aeab340,fffffd806847ed50,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:2135 uvm_map_teardown(fffffd806aeab340) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd806aeab340) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2771 uvmspace_free(fffffd806aeab340) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3685 reaper(ffff8000fffff7a0) at reaper+0x15e sys/kern/kern_exit.c:462 end trace frame: 0x0, count: -9 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002160dc90 rbx 0xfffffd800658ff80 rdx 0 rcx 0 rax 0xffff8000fffff7a0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xc2a67a0175845f68 r11 0x8c9f0c53cd3fc6ef r12 0 r13 0xffffffff82537bf8 uvm_map_addr_RBT_INFO r14 0 r15 0x1 rip 0xffffffff81c048a8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002160dc80 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (reaper) pid=324753 stat=onproc flags process=14000 proc=200 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffffefc0,0xffff8000fffffa50 process=0xffff8000ffffafa8 user=0xffff800021609000, vmspace=0xffffffff828f2c20 estcpu=36, cpticks=88, pctcpu=19.83 user=0, sys=2, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 48051 192697 0 0 3 0x14200 bored sosplice 77272 359827 79400 0 3 0x82 thrsleep syz-fuzzer 77272 382568 79400 0 3 0x4000082 nanoslp syz-fuzzer 77272 117468 79400 0 3 0x4000082 thrsleep syz-fuzzer 77272 60744 79400 0 3 0x4000082 wait syz-fuzzer 77272 397571 79400 0 3 0x4000082 thrsleep syz-fuzzer 77272 247018 79400 0 2 0x4000002 syz-fuzzer 77272 402756 79400 0 3 0x4000082 thrsleep syz-fuzzer 79400 338494 11379 0 3 0x10008a sigsusp ksh 11379 29763 29119 0 3 0x9a poll sshd 95162 514218 1 0 3 0x100083 ttyin getty 29119 479219 1 0 3 0x88 poll sshd 85249 256330 84592 73 2 0x100010 syslogd 84592 404768 1 0 3 0x100082 netio syslogd 89146 507150 1 0 3 0x100080 kqread resolvd 35351 484442 57492 77 3 0x100092 kqread dhcpleased 85904 170600 57492 77 3 0x100092 kqread dhcpleased 57492 475878 1 0 3 0x80 kqread dhcpleased 26140 423320 0 0 3 0x14200 bored smr 66178 241906 0 0 2 0x14200 zerothread 83136 211721 0 0 3 0x14200 aiodoned aiodoned 87517 482208 0 0 3 0x14200 getblk update 54349 409642 0 0 3 0x14200 cleaner cleaner *27467 324753 0 0 7 0x14200 reaper 57364 434405 0 0 3 0x14200 pgdaemon pagedaemon 42507 307218 0 0 3 0x14200 bored viomb 76274 232737 0 0 3 0x40014200 acpi0 acpi0 73145 430570 0 0 3 0x14200 bored softnet 82526 384978 0 0 3 0x14200 bored systqmp 64781 407897 0 0 3 0x14200 bored systq 60320 318712 0 0 3 0x40014200 bored softclock 32144 441445 0 0 3 0x40014200 idle0 1 75923 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10130 6381K 6584K 78643K 11292 0 pcb 13 8K 8K 78643K 53 0 rtable 62 2K 4K 78643K 232 0 ifaddr 24 7K 12K 78643K 53 0 counters 19 16K 16K 78643K 23 0 ioctlops 0 0K 4K 78643K 79 0 iov 0 0K 4K 78643K 5 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1231 77K 77K 78643K 1243 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 0K 0K 78643K 2 0 sem 7 0K 0K 78643K 7 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 2 1K 37K 78643K 232 0 proc 55 54K 71K 78643K 337 0 subproc 0 0K 3K 78643K 52 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 4 0 in_multi 11 0K 3K 78643K 55 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 43 201K 201K 78643K 43 0 exec 0 0K 2K 78643K 412 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 192 37K 60K 78643K 3920 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 20 0 NDP 3 0K 1K 78643K 15 0 temp 31 4178K 4243K 78643K 3691 0 kqueue 10 14K 14K 78643K 16 0 SYN cache 2 16K 16K 78643K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 29 0 26 1 0 1 1 0 8 0 rtentry 112 67 0 45 2 1 1 2 0 8 0 unpcb 136 104 0 91 1 0 1 1 0 8 0 syncache 296 15 0 15 1 1 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 27 0 27 4 4 0 1 0 8 0 tcpcb 736 80 0 76 3 2 1 3 0 8 0 arp 88 10 0 8 1 0 1 1 0 8 0 inpcb 304 184 0 177 2 1 1 2 0 8 0 nd6 48 12 0 12 1 1 0 1 0 8 0 kcovpl 48 4 0 4 1 1 0 1 0 8 0 pfrule 1360 50 0 50 1 1 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 277 0 180 18 5 13 18 0 8 6 art_table 32 278 0 180 3 2 1 3 0 8 0 art_node 16 66 0 46 1 0 1 1 0 8 0 semupl 112 5 0 5 3 3 0 1 0 8 0 semapl 112 5 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1611 0 208 89 0 89 89 0 8 0 ffsino 240 1611 0 208 83 0 83 83 0 8 0 nchpl 144 2029 0 441 61 0 61 61 0 8 0 uvmvnodes 80 1680 0 0 35 0 35 35 0 8 0 vnodes 224 1680 0 0 99 0 99 99 0 8 0 namei 1024 5600 0 5600 6 5 1 1 0 8 1 scxspl 216 6516 0 6512 10 9 1 8 0 8 0 plimitpl 152 39 0 29 1 0 1 1 0 8 0 sigapl 424 442 0 415 5 1 4 5 0 8 0 futexpl 64 1660 0 1660 4 4 0 1 0 8 0 knotepl 112 215 0 181 2 0 2 2 0 8 0 kqueuepl 184 20 0 14 1 0 1 1 0 8 0 pipepl 304 81 0 73 2 0 2 2 0 8 0 fdescpl 432 428 0 415 5 3 2 3 0 8 0 filepl 120 1816 0 1743 6 2 4 6 0 8 0 lockfpl 104 6 0 4 1 0 1 1 0 8 0 lockfspl 48 4 0 2 1 0 1 1 0 8 0 sessionpl 144 19 0 8 1 0 1 1 0 8 0 pgrppl 48 19 0 8 1 0 1 1 0 8 0 ucredpl 96 119 0 109 1 0 1 1 0 8 0 zombiepl 144 415 0 411 1 0 1 1 0 8 0 processpl 1000 442 0 411 5 0 5 5 0 8 0 procpl 672 670 0 628 5 0 5 5 0 8 0 sosppl 168 9 0 9 1 1 0 1 0 8 0 sockpl 448 317 0 294 5 2 3 5 0 8 0 mcl64k 65536 35 0 35 6 6 0 1 0 8 0 mcl16k 16384 4 0 4 1 1 0 1 0 8 0 mcl8k 8192 33 0 33 2 2 0 1 0 8 0 mcl4k 4096 34 0 34 2 2 0 1 0 8 0 mcl2k 2048 18344 0 18297 19 9 10 11 0 8 2 mtagpl 96 11 0 11 2 2 0 1 0 8 0 mbufpl 256 40946 0 40783 37 23 14 37 0 8 0 bufpl 288 5566 0 134 388 0 388 388 0 8 0 anonpl 24 173361 0 141632 278 11 267 274 0 188 72 amapchunkpl 152 15479 0 13508 111 10 101 108 0 158 24 amappl16 200 670 0 509 11 0 11 11 0 8 0 amappl15 192 50 0 50 3 3 0 1 0 8 0 amappl14 184 73 0 68 1 0 1 1 0 8 0 amappl13 176 47 0 44 1 0 1 1 0 8 0 amappl12 168 61 0 59 2 1 1 1 0 8 0 amappl11 160 85 0 73 1 0 1 1 0 8 0 amappl10 152 49 0 43 1 0 1 1 0 8 0 amappl9 144 475 0 472 1 0 1 1 0 8 0 amappl8 136 369 0 344 2 0 2 2 0 8 0 amappl7 128 114 0 105 1 0 1 1 0 8 0 amappl6 120 140 0 125 1 0 1 1 0 8 0 amappl5 112 274 0 258 1 0 1 1 0 8 0 amappl4 104 646 0 620 1 0 1 1 0 8 0 amappl3 96 193 0 174 1 0 1 1 0 8 0 amappl2 88 404 0 362 2 0 2 2 0 8 0 amappl1 80 10558 0 10100 12 1 11 12 0 8 0 amappl 88 3614 0 3462 6 1 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 428 0 412 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 428 0 412 1 0 1 1 0 8 0 vmmpekpl 168 7110 0 7087 2 0 2 2 0 8 0 vmmpepl 168 41494 0 40077 84 13 71 83 0 357 0 vmsppl 272 427 0 411 3 1 2 2 0 8 0 rwobjpl 24 12943 0 10342 16 0 16 16 0 8 0 pdppl 4096 862 0 822 64 21 43 52 0 8 3 pvpl 32 367769 0 333987 502 18 484 492 0 265 199 pmappl 216 427 0 411 2 0 2 2 0 8 0 extentpl 40 57 0 38 1 0 1 1 0 8 0 phpool 112 734 0 82 20 0 20 20 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff82430ddb) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff8249da19,ffffffff82453bb9,4f4,ffffffff82453bec) at __assert+0x25 sys/kern/subr_prf.c:161 uvm_pageunwire(fffffd800658ff80) at uvm_pageunwire+0x19b sys/uvm/uvm_page.c:1268 uvm_fault_unwire_locked(fffffd806aeab340,1aec7665000,1aec7864000) at uvm_fault_unwire_locked+0x23b sys/uvm/uvm_fault.c:1654 uvm_unmap_kill_entry_withlock(fffffd806aeab340,fffffd806847ed50,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:2135 uvm_map_teardown(fffffd806aeab340) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd806aeab340) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2771 uvmspace_free(fffffd806aeab340) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3685 reaper(ffff8000fffff7a0) at reaper+0x15e sys/kern/kern_exit.c:462 end trace frame: 0x0, count: -9 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff82430ddb) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff8249da19,ffffffff82453bb9,4f4,ffffffff82453bec) at __assert+0x25 sys/kern/subr_prf.c:161 uvm_pageunwire(fffffd800658ff80) at uvm_pageunwire+0x19b sys/uvm/uvm_page.c:1268 uvm_fault_unwire_locked(fffffd806aeab340,1aec7665000,1aec7864000) at uvm_fault_unwire_locked+0x23b sys/uvm/uvm_fault.c:1654 uvm_unmap_kill_entry_withlock(fffffd806aeab340,fffffd806847ed50,0) at uvm_unmap_kill_entry_withlock+0x62 sys/uvm/uvm_map.c:2135 uvm_map_teardown(fffffd806aeab340) at uvm_map_teardown+0x167 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] uvm_map_teardown(fffffd806aeab340) at uvm_map_teardown+0x167 sys/uvm/uvm_map.c:2771 uvmspace_free(fffffd806aeab340) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3685 reaper(ffff8000fffff7a0) at reaper+0x15e sys/kern/kern_exit.c:462 end trace frame: 0x0, count: -9