panic: kernel diagnostic assertion "dupe == NULL" failed: file "/syzkaller/managers/main/kernel/sys/uvm/uvm_page.c", line 144 Stopped at db_enter+0x1c: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *358086 82372 0 0 0 0 syz-executor.7 db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82883774) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff8290ac65,ffffffff828ada6a,90,ffffffff828570d8) at __assert+0x29 sys/kern/subr_prf.c:157 uvm_pagealloc_pg(fffffd8006e0d600,fffffd806b22a1c8,38f5383000,0) at uvm_pagealloc_pg+0x427 uvm_pageinsert sys/uvm/uvm_page.c:138 [inline] uvm_pagealloc_pg(fffffd8006e0d600,fffffd806b22a1c8,38f5383000,0) at uvm_pagealloc_pg+0x427 sys/uvm/uvm_page.c:709 uvm_pagealloc(fffffd806b22a1c8,38f5383000,0,3) at uvm_pagealloc+0x1ec sys/uvm/uvm_page.c:917 pmap_get_ptp(fffffd806b22a1b8,71ea707fa000) at pmap_get_ptp+0x18d sys/arch/amd64/amd64/pmap.c:1215 pmap_enter(fffffd806b22a1b8,71ea707fa000,692b2000,1,20) at pmap_enter+0x29d sys/arch/amd64/amd64/pmap.c:2722 uvm_fault_upper_lookup(ffff80002c0f50e0,ffff80002c0f5118,ffff80002c0f4fe0,ffff80002c0f5060) at uvm_fault_upper_lookup+0x2a1 sys/uvm/uvm_fault.c:895 uvm_fault(fffffd806c169438,71ea707fb000,0,1) at uvm_fault+0x109 sys/uvm/uvm_fault.c:605 upageflttrap(ffff80002c0f5260,71ea707fbe90) at upageflttrap+0x80 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff80002c0f5260) at usertrap+0x20d sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x71ea707fbf20, 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: kernel diagnostic assertion "dupe == NULL" failed: file "/syzkaller/managers/main/kernel/sys/uvm/uvm_page.c", line 144 ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82883774) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff8290ac65,ffffffff828ada6a,90,ffffffff828570d8) at __assert+0x29 sys/kern/subr_prf.c:157 uvm_pagealloc_pg(fffffd8006e0d600,fffffd806b22a1c8,38f5383000,0) at uvm_pagealloc_pg+0x427 uvm_pageinsert sys/uvm/uvm_page.c:138 [inline] uvm_pagealloc_pg(fffffd8006e0d600,fffffd806b22a1c8,38f5383000,0) at uvm_pagealloc_pg+0x427 sys/uvm/uvm_page.c:709 uvm_pagealloc(fffffd806b22a1c8,38f5383000,0,3) at uvm_pagealloc+0x1ec sys/uvm/uvm_page.c:917 pmap_get_ptp(fffffd806b22a1b8,71ea707fa000) at pmap_get_ptp+0x18d sys/arch/amd64/amd64/pmap.c:1215 pmap_enter(fffffd806b22a1b8,71ea707fa000,692b2000,1,20) at pmap_enter+0x29d sys/arch/amd64/amd64/pmap.c:2722 uvm_fault_upper_lookup(ffff80002c0f50e0,ffff80002c0f5118,ffff80002c0f4fe0,ffff80002c0f5060) at uvm_fault_upper_lookup+0x2a1 sys/uvm/uvm_fault.c:895 uvm_fault(fffffd806c169438,71ea707fb000,0,1) at uvm_fault+0x109 sys/uvm/uvm_fault.c:605 upageflttrap(ffff80002c0f5260,71ea707fbe90) at upageflttrap+0x80 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff80002c0f5260) at usertrap+0x20d sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x71ea707fbf20, count: -12 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002c0f4bf0 rbx 0 rdx 0 rcx 0 rax 0xffff80002a63c570 r8 0x101010101010101 r9 0x8080808080808080 r10 0xa5da1b470be1d246 r11 0xd1116c0b8e97beea r12 0 r13 0x38f5383000 r14 0 r15 0x1 rip 0xffffffff8142113c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff80002c0f4be0 ss 0 db_enter+0x1c: addq $0x8,%rsp ddb> show proc PROC (syz-executor.7) tid=358086 pid=82372 tcnt=2 stat=onproc flags process=0 proc=0 runpri=32, usrpri=80, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 forw=0xffffffffffffffff, list=0xffff80002a63b000,0xffff80002a63d570 process=0xffff80003298f258 user=0xffff80002c0f0000, vmspace=0xfffffd806c169438 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 88642 73030 47619 0 2 0 syz-executor.5 65133 149808 12639 0 3 0x3000 suspend syz-executor.4 65133 405908 12639 0 2 0x4081000 syz-executor.4 *82372 358086 59408 0 7 0 syz-executor.7 82372 57722 59408 0 2 0x4000000 syz-executor.7 89330 64548 8072 0 3 0x80 fsleep syz-executor.2 89330 69159 8072 0 3 0x4000080 lockf syz-executor.2 15443 351616 1 0 3 0x100083 ttyin getty 79264 408651 0 0 3 0x14280 nfsidl nfsio 60573 61210 0 0 3 0x14280 nfsidl nfsio 67577 456485 0 0 3 0x14280 nfsidl nfsio 16503 407193 0 0 3 0x14280 nfsidl nfsio 15641 221834 0 0 3 0x14280 nfsidl nfsio 17092 522067 0 0 3 0x14280 nfsidl nfsio 23008 153185 0 0 3 0x14280 nfsidl nfsio 10720 310760 0 0 3 0x14280 nfsidl nfsio 50174 420357 0 0 3 0x14280 nfsidl nfsio 54419 433538 0 0 3 0x14280 nfsidl nfsio 22210 358354 0 0 3 0x14280 nfsidl nfsio 19641 384428 0 0 3 0x14280 nfsidl nfsio 78811 189918 0 0 3 0x14280 nfsidl nfsio 23023 224072 0 0 3 0x14280 nfsidl nfsio 28121 68855 0 0 3 0x14280 nfsidl nfsio 42693 355663 0 0 3 0x14280 nfsidl nfsio 51871 154285 0 0 3 0x14280 nfsidl nfsio 70851 100885 0 0 3 0x14280 nfsidl nfsio 25276 392915 0 0 3 0x14280 nfsidl nfsio 54162 52276 0 0 3 0x14280 nfsidl nfsio 59408 264388 23428 0 3 0x82 nanoslp syz-executor.7 48938 80911 0 0 3 0x14200 acct acct 8072 171253 23428 0 3 0x82 nanoslp syz-executor.2 72029 7392 0 0 3 0x14200 bored sosplice 47619 39530 23428 0 3 0x82 nanoslp syz-executor.5 77704 476221 23428 0 3 0x2 biowait syz-executor.3 12639 7568 23428 0 3 0x82 nanoslp syz-executor.4 43176 186094 23428 0 3 0x2 biowait syz-executor.1 18568 88347 23428 0 2 0x2 syz-executor.0 42544 210426 23428 0 3 0x2 biowait syz-executor.6 23428 248230 32721 0 3 0x2000082 thrsleep syz-fuzzer 23428 311251 32721 0 3 0x6000082 nanoslp syz-fuzzer 23428 304365 32721 0 3 0x6000082 wait syz-fuzzer 23428 243330 32721 0 3 0x6000082 thrsleep syz-fuzzer 23428 147587 32721 0 3 0x6000082 wait syz-fuzzer 23428 43536 32721 0 3 0x6000082 wait syz-fuzzer 23428 158159 32721 0 3 0x6000082 wait syz-fuzzer 23428 400803 32721 0 3 0x6000082 wait syz-fuzzer 23428 401152 32721 0 3 0x6000082 wait syz-fuzzer 23428 76790 32721 0 3 0x6000082 kqread syz-fuzzer 23428 391522 32721 0 3 0x6000082 thrsleep syz-fuzzer 23428 486462 32721 0 3 0x6000082 wait syz-fuzzer 23428 505386 32721 0 3 0x6000082 wait syz-fuzzer 23428 6354 32721 0 3 0x6000082 thrsleep syz-fuzzer 32721 213220 66975 0 3 0x10008a sigsusp ksh 66975 65285 23744 0 3 0x9a kqread sshd 23744 109360 1 0 3 0x88 kqread sshd 38714 437982 82869 73 3 0x1100090 kqread syslogd 82869 12105 1 0 3 0x100082 netio syslogd 3928 283922 1 0 3 0x100080 kqread resolvd 75103 493731 35421 77 3 0x100092 kqread dhcpleased 62140 83180 35421 77 3 0x100092 kqread dhcpleased 35421 90280 1 0 3 0x80 kqread dhcpleased 55611 99452 0 0 3 0x14200 bored smr 55846 459489 0 0 2 0x14200 zerothread 60996 359254 0 0 3 0x14200 aiodoned aiodoned 59405 278540 0 0 3 0x14200 syncer update 88321 210355 0 0 3 0x14200 cleaner cleaner 15344 243660 0 0 3 0x14200 reaper reaper 45050 523352 0 0 3 0x14200 pgdaemon pagedaemon 44187 257891 0 0 3 0x14200 bored viomb 62806 98035 0 0 3 0x40014200 acpi0 acpi0 10771 140775 0 0 3 0x14200 bored softnet3 15071 416076 0 0 3 0x14200 bored softnet2 67805 276048 0 0 3 0x14200 bored softnet1 72612 179259 0 0 3 0x14200 bored softnet0 88258 288869 0 0 3 0x14200 bored systqmp 75912 475505 0 0 3 0x14200 bored systq 32218 184493 0 0 3 0x40014200 tmoslp softclock 95919 441823 0 0 3 0x40014200 idle0 1 299584 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 10209 6675K 7504K 166960K 16768 0 pcb 15 12K 14K 166960K 298 0 rtable 141 13K 15K 166960K 589 0 pf 29 8K 9K 166960K 63 0 ifaddr 33 9K 11K 166960K 77 0 ifgroup 50 2K 2K 166960K 104 0 sysctl 4 1K 2K 166960K 10 0 counters 30 17K 17K 166960K 44 0 ioctlops 0 0K 2K 166960K 219 0 iov 0 0K 16K 166960K 193 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1276 80K 80K 166960K 3237 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 25K 166960K 89 0 VM map 2 1K 1K 166960K 2 0 sem 12 1K 1K 166960K 83 0 dirhash 12 2K 3K 166960K 87 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 14 49K 69K 166960K 6629 0 sigio 0 0K 0K 166960K 158 0 proc 58 59K 75K 166960K 734 0 subproc 104 6K 6K 166960K 130 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 419 0 in_multi 53 3K 7K 166960K 242 0 ether_multi 1 0K 0K 166960K 11 0 mrt 0 0K 0K 166960K 21 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 91 413K 413K 166960K 91 0 exec 0 0K 1K 166960K 605 0 pfkey data 0 0K 0K 166960K 5 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 300 163K 183K 166960K 57727 0 UVM aobj 131 4K 4K 166960K 141 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 239 0 NDP 11 0K 2K 166960K 45 0 temp 74 6764K 6844K 166960K 39186 0 kqueue 12 18K 43K 166960K 437 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 177 0 174 1 0 1 1 0 8 0 rtentry 112 155 0 96 4 0 4 4 0 8 0 unpcb 144 1902 0 1889 3 0 3 3 0 8 2 syncache 336 158 0 158 1 0 1 1 0 8 1 tcpqe 32 156 0 156 1 0 1 1 0 8 1 tcpcb 808 1078 0 1049 7 0 7 7 0 8 2 arp 88 25 0 18 1 0 1 1 0 8 0 ipq 40 7 0 7 1 0 1 1 0 8 1 ipqe 40 17 0 17 1 0 1 1 0 8 1 inpcb 360 2672 0 2635 10 0 10 10 0 8 3 nd6 104 33 0 21 1 0 1 1 0 8 0 pkpcb 40 10 0 10 1 0 1 1 0 8 1 kcovpl 48 10 0 2 1 0 1 1 0 8 0 ppxss 1072 4 0 4 1 0 1 1 0 8 1 art_heap8 4096 4 0 3 2 0 2 2 0 8 1 art_heap4 256 602 0 330 29 1 28 29 0 8 8 art_table 32 606 0 333 4 0 4 4 0 8 0 art_node 16 154 0 101 1 0 1 1 0 8 0 sysvmsgpl 40 27 0 13 1 0 1 1 0 8 0 semupl 112 7 0 7 1 0 1 1 0 8 1 semapl 112 73 0 63 1 0 1 1 0 8 0 shmpl 112 138 0 10 4 0 4 4 0 8 0 dirhash 1024 67 0 50 3 0 3 3 0 8 0 dino2pl 256 9714 0 8279 91 0 91 91 0 8 0 ffsino 240 9714 0 8279 85 0 85 85 0 8 0 nchpl 144 17526 0 15898 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 44424 0 44422 2 0 2 2 0 8 1 vcpupl 2048 7 0 1 1 0 1 1 0 8 0 vmpool 664 9 0 3 1 0 1 1 0 8 0 kstatmem 264 50 0 28 2 0 2 2 0 8 0 scxspl 216 52344 0 52341 8 0 8 8 1 8 7 plimitpl 152 361 0 346 1 0 1 1 0 8 0 sigapl 424 6947 0 6884 8 0 8 8 0 8 0 futexpl 64 38573 0 38572 1 0 1 1 0 8 0 knotepl 120 65432 0 65349 24 12 12 24 0 8 7 kqueuepl 184 571 0 561 1 0 1 1 0 8 0 pipepl 288 462 0 434 11 0 11 11 0 8 8 fdescpl 432 6909 0 6884 4 0 4 4 0 8 0 filepl 120 19789 0 19547 15 0 15 15 0 8 7 lockfpl 104 907 0 903 1 0 1 1 0 8 0 lockfspl 48 362 0 359 1 0 1 1 0 8 0 sessionpl 144 28 0 12 1 0 1 1 0 8 0 pgrppl 48 100 0 84 1 0 1 1 0 8 0 ucredpl 104 3058 0 3046 1 0 1 1 0 8 0 zombiepl 144 6884 0 6884 1 0 1 1 0 8 1 processpl 1072 6947 0 6884 5 0 5 5 0 8 0 procpl 680 14035 0 13956 9 0 9 9 0 8 1 sosppl 168 117 0 115 1 0 1 1 0 8 0 sockpl 488 4767 0 4719 15 0 15 15 0 8 4 mcl64k 65536 61 0 61 1 0 1 1 0 8 1 mcl16k 16384 58 0 58 1 0 1 1 0 8 1 mcl12k 12288 61 0 61 1 0 1 1 0 8 1 mcl9k 9216 13 0 13 1 0 1 1 0 8 1 mcl8k 8192 129 0 129 1 0 1 1 0 8 1 mcl4k 4096 263 0 263 1 0 1 1 0 8 1 mcl2k2 2112 7 0 7 1 0 1 1 0 8 1 mcl2k 2048 35342 0 35291 33 21 12 33 0 8 3 mtagpl 96 366 0 132 7 0 7 7 0 8 0 mbufpl 256 128042 0 127620 42 7 35 35 0 8 4 bufpl 280 12432 0 6033 458 0 458 458 0 8 0 anonpl 24 677730 0 670164 96 0 96 96 0 188 41 amapchunkpl 152 184561 0 183941 38 0 38 38 0 158 13 amappl16 200 13265 0 13065 57 33 24 37 0 8 12 amappl15 192 38 0 35 1 0 1 1 0 8 0 amappl14 184 168 0 153 2 0 2 2 0 8 1 amappl13 176 8 0 8 1 0 1 1 0 8 1 amappl12 168 7575 0 7549 2 0 2 2 0 8 0 amappl11 160 56 0 45 1 0 1 1 0 8 0 amappl10 152 32 0 22 1 0 1 1 0 8 0 amappl9 144 71 0 71 1 0 1 1 0 8 1 amappl8 136 267 0 197 3 0 3 3 0 8 0 amappl7 128 169 0 150 2 0 2 2 0 8 0 amappl6 120 274 0 259 1 0 1 1 0 8 0 amappl5 112 151 0 143 1 0 1 1 0 8 0 amappl4 104 487 0 465 2 0 2 2 0 8 1 amappl3 96 37461 0 37393 3 0 3 3 0 8 0 amappl2 88 7451 0 7378 3 0 3 3 0 8 1 amappl1 80 31019 0 30520 22 2 20 22 0 8 8 amappl 88 57086 0 56911 6 0 6 6 0 92 1 dma4096 4096 1 0 1 1 0 1 1 0 8 1 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 0 1 1 0 8 1 dma128 128 253 0 253 1 0 1 1 0 8 1 dma64 64 6 0 6 1 0 1 1 0 8 1 dma32 32 7 0 7 1 0 1 1 0 8 1 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 140 0 10 3 0 3 3 0 8 0 uaddrrnd 24 6918 0 6887 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 6918 0 6887 1 0 1 1 0 8 0 vmmpekpl 168 39693 0 39635 3 0 3 3 0 8 0 vmmpepl 168 394692 0 392824 112 0 112 112 0 357 22 vmsppl 352 6917 0 6887 4 0 4 4 0 8 0 rwobjpl 24 92330 0 85109 47 0 47 47 0 8 2 pdppl 4096 13842 0 13780 314 246 68 71 0 8 6 pvpl 32 1960951 0 1947932 325 0 325 325 0 265 208 pmappl 216 6917 0 6887 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 637 0 275 11 0 11 11 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82883774) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff8290ac65,ffffffff828ada6a,90,ffffffff828570d8) at __assert+0x29 sys/kern/subr_prf.c:157 uvm_pagealloc_pg(fffffd8006e0d600,fffffd806b22a1c8,38f5383000,0) at uvm_pagealloc_pg+0x427 uvm_pageinsert sys/uvm/uvm_page.c:138 [inline] uvm_pagealloc_pg(fffffd8006e0d600,fffffd806b22a1c8,38f5383000,0) at uvm_pagealloc_pg+0x427 sys/uvm/uvm_page.c:709 uvm_pagealloc(fffffd806b22a1c8,38f5383000,0,3) at uvm_pagealloc+0x1ec sys/uvm/uvm_page.c:917 pmap_get_ptp(fffffd806b22a1b8,71ea707fa000) at pmap_get_ptp+0x18d sys/arch/amd64/amd64/pmap.c:1215 pmap_enter(fffffd806b22a1b8,71ea707fa000,692b2000,1,20) at pmap_enter+0x29d sys/arch/amd64/amd64/pmap.c:2722 uvm_fault_upper_lookup(ffff80002c0f50e0,ffff80002c0f5118,ffff80002c0f4fe0,ffff80002c0f5060) at uvm_fault_upper_lookup+0x2a1 sys/uvm/uvm_fault.c:895 uvm_fault(fffffd806c169438,71ea707fb000,0,1) at uvm_fault+0x109 sys/uvm/uvm_fault.c:605 upageflttrap(ffff80002c0f5260,71ea707fbe90) at upageflttrap+0x80 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff80002c0f5260) at usertrap+0x20d sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x71ea707fbf20, count: -12 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82883774) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff8290ac65,ffffffff828ada6a,90,ffffffff828570d8) at __assert+0x29 sys/kern/subr_prf.c:157 uvm_pagealloc_pg(fffffd8006e0d600,fffffd806b22a1c8,38f5383000,0) at uvm_pagealloc_pg+0x427 uvm_pageinsert sys/uvm/uvm_page.c:138 [inline] uvm_pagealloc_pg(fffffd8006e0d600,fffffd806b22a1c8,38f5383000,0) at uvm_pagealloc_pg+0x427 sys/uvm/uvm_page.c:709 uvm_pagealloc(fffffd806b22a1c8,38f5383000,0,3) at uvm_pagealloc+0x1ec sys/uvm/uvm_page.c:917 pmap_get_ptp(fffffd806b22a1b8,71ea707fa000) at pmap_get_ptp+0x18d sys/arch/amd64/amd64/pmap.c:1215 pmap_enter(fffffd806b22a1b8,71ea707fa000,692b2000,1,20) at pmap_enter+0x29d sys/arch/amd64/amd64/pmap.c:2722 uvm_fault_upper_lookup(ffff80002c0f50e0,ffff80002c0f5118,ffff80002c0f4fe0,ffff80002c0f5060) at uvm_fault_upper_lookup+0x2a1 sys/uvm/uvm_fault.c:895 uvm_fault(fffffd806c169438,71ea707fb000,0,1) at uvm_fault+0x109 sys/uvm/uvm_fault.c:605 upageflttrap(ffff80002c0f5260,71ea707fbe90) at upageflttrap+0x80 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff80002c0f5260) at usertrap+0x20d sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x71ea707fbf20, count: -12