panic: kernel diagnostic assertion "pg->wire_count != 0" failed: file "/syzkaller/managers/setuid/kernel/sys/uvm/uvm_page.c", line 1250 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 386959 21328 32767 0x10 0 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b8874) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f54db,ffffffff83447edc,4e2,ffffffff83447f11) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd800913c638) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806c826d80,53169f93000,53169f94000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806c826d80,fffffd806033f3b8,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806c826d80) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806c826d80) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80003c417a20,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff80003c417a20,ffff80003c3ff920,ffff80003c3ff870) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c3ff920) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3ff920) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x761f81eb57e0, count: 4 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: kernel diagnostic assertion "pg->wire_count != 0" failed: file "/syzkaller/managers/setuid/kernel/sys/uvm/uvm_page.c", line 1250 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b8874) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f54db,ffffffff83447edc,4e2,ffffffff83447f11) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd800913c638) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806c826d80,53169f93000,53169f94000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806c826d80,fffffd806033f3b8,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806c826d80) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806c826d80) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80003c417a20,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff80003c417a20,ffff80003c3ff920,ffff80003c3ff870) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c3ff920) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3ff920) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x761f81eb57e0, count: -11 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c3ff540 rbx 0xffff80002999ee07 rdx 0 rcx 0xffff80003c417a20 rax 0xffff80002999dff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x40af88f6fc4faf39 r11 0x9c2c57e2844b7b02 r12 0xffff80002999ec08 r13 0 r14 0 r15 0x1 rip 0xffffffff812e3ea5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c3ff530 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=317435 pid=63718 tcnt=0 stat=onproc flags process=1018 proc=2000 runpri=32, usrpri=83, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003c417a20 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80003a3b8550,0xffff80003c417500 process=0xffff80003bbd79e0 user=0xffff80003c3fa000, vmspace=0xfffffd806c826d80 estcpu=33, cpticks=12, pctcpu=0.1, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 21328 386959 4431 32767 7 0x10 syz-executor 21328 388576 4431 32767 2 0x4000010 syz-executor 73463 257386 17136 32767 3 0x3010 suspend syz-executor 73463 215056 17136 32767 2 0x4081090 syz-executor 89268 115118 34206 32767 2 0x10 syz-executor 70865 369050 9722 32767 2 0x10 syz-executor 70865 202155 9722 32767 3 0x4000090 fsleep syz-executor 60448 455804 34072 32767 2 0x10 syz-executor 60448 403653 34072 32767 2 0x4000090 syz-executor 59601 32547 43132 32767 2 0x10 syz-executor 59601 337360 43132 32767 3 0x4000090 fsleep syz-executor 43132 134765 25650 32767 2 0xc90 syz-executor 34072 268124 88883 32767 3 0x90 nanoslp syz-executor 4431 63012 71 32767 3 0x90 nanoslp syz-executor 17136 323057 59333 32767 3 0x90 nanoslp syz-executor 9979 342993 92703 32767 2 0xc90 syz-executor 34206 99290 63622 32767 3 0x90 nanoslp syz-executor 9722 265141 90720 32767 3 0x90 nanoslp syz-executor 86875 161552 70180 0 3 0x82 wait syz-executor 92703 519792 70180 0 3 0x82 wait syz-executor 59333 269992 70180 0 3 0x82 wait syz-executor 25650 42613 70180 0 3 0x82 wait syz-executor 88883 250985 70180 0 3 0x82 wait syz-executor 90720 367469 70180 0 3 0x82 wait syz-executor 63622 515325 70180 0 3 0x82 wait syz-executor 71 22501 70180 0 3 0x82 wait syz-executor 70180 346495 5146 0 3 0x82 kqread syz-executor 5146 139572 87927 0 3 0x10008a sigsusp ksh 87927 415847 72433 0 3 0x98 kqread sshd-session 72433 393455 15528 0 3 0x92 kqread sshd-session 12713 320938 1 0 3 0x100083 ttyin getty 15528 177443 1 0 3 0x88 kqread sshd 74419 485806 11381 73 3 0x1100090 kqread syslogd 11381 372348 1 0 3 0x100082 sbwait syslogd 26839 82536 1 0 3 0x100080 kqread resolvd 68066 201924 56693 77 3 0x100092 kqread dhcpleased 96329 482728 56693 77 3 0x100092 kqread dhcpleased 56693 194296 1 0 3 0x80 kqread dhcpleased 63930 233539 0 0 3 0x14200 bored smr 92448 147270 0 0 3 0x14200 pgzero zerothread 18250 427519 0 0 3 0x14200 aiodoned aiodoned 92977 270828 0 0 3 0x14200 syncer update 83324 471604 0 0 3 0x14200 cleaner cleaner 55285 247779 0 0 3 0x14200 reaper reaper 25665 401870 0 0 3 0x14200 pgdaemon pagedaemon 12389 163771 0 0 3 0x14200 bored viomb 34565 255942 0 0 3 0x40014200 acpi0 acpi0 97257 295191 0 0 3 0x40014200 idle1 91733 297380 0 0 3 0x14200 bored softnet1 25340 302140 0 0 2 0x14200 softnet0 80549 74321 0 0 3 0x14200 bored systqmp 79079 295582 0 0 3 0x14200 bored systq 39710 455159 0 0 3 0x14200 tmoslp softclockmp 1720 136817 0 0 3 0x40014200 tmoslp softclock 25960 191471 0 0 3 0x40014200 idle0 1 257758 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 21328 (syz-executor) thread 0xffff80003a3b9a10 (386959) exclusive rwlock vmmaplk r = 0 (0xfffffd806c960e78) #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 uvm_mapanon+0x28f sys/uvm/uvm_map.c:-1 #4 uvm_mmapanon+0x1d0 sys/uvm/uvm_mmap.c:1029 #5 sys_mmap+0xa80 sys/uvm/uvm_mmap.c:426 #6 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #7 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11056 12019K 12034K 166960K 12147 0 pcb 17 12K 12K 166960K 17 0 rtable 241 6K 7K 166960K 369 0 pf 31 16K 16K 166960K 31 0 ifaddr 42 7K 7K 166960K 44 0 ifgroup 50 2K 2K 166960K 50 0 sysctl 1 1K 9K 166960K 6 0 counters 70 37K 37K 166960K 70 0 ioctlops 0 0K 4K 166960K 37 0 iov 0 0K 4K 166960K 32 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1288 81K 81K 166960K 1500 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 11 0 VM map 2 1K 1K 166960K 2 0 sem 12 1K 1K 166960K 16 0 dirhash 12 2K 2K 166960K 24 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 24 89K 125K 166960K 472 0 sigio 0 0K 0K 166960K 7 0 proc 62 131K 147K 166960K 545 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 104 0 in_multi 99 7K 7K 166960K 107 0 ether_multi 1 0K 0K 166960K 2 0 mrt 0 0K 0K 166960K 17 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 391 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 246 186K 186K 166960K 6033 0 UVM aobj 22 2K 4K 166960K 25 0 pinsyscall 45 90K 114K 166960K 1592 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 38 0 NDP 11 0K 2K 166960K 27 0 temp 62 9120K 9132K 166960K 4617 0 kqueue 13 20K 31K 166960K 117 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 98 0 95 2 0 2 2 0 8 1 rtentry 176 113 0 1 6 0 6 6 0 8 0 unpcb 144 539 0 524 6 3 3 6 0 8 2 syncache 336 8 0 8 1 0 1 1 0 8 1 tcpcb 736 390 0 385 10 3 7 10 0 8 6 arp 136 19 0 0 1 0 1 1 0 8 0 ipq 40 1 0 0 1 0 1 1 0 8 0 ipqe 40 1 0 0 1 0 1 1 0 8 0 inpcb 328 783 0 774 13 3 10 12 0 8 8 nd6 152 25 0 0 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 256 456 0 0 29 0 29 29 0 8 0 art_table 40 457 0 0 5 0 5 5 0 8 0 art_node 32 113 0 11 1 0 1 1 0 8 0 sysvmsgpl 40 15 0 9 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 72 10 0 0 1 0 1 1 0 8 0 shmpl 112 22 0 3 1 0 1 1 0 8 0 dirhash 1024 25 0 8 3 0 3 3 0 8 0 dino2pl 256 2117 0 653 92 0 92 92 0 8 0 ffsino 296 2117 0 653 114 0 114 114 0 8 1 nchpl 144 2805 0 1110 64 0 64 64 0 8 0 vnodes 216 2198 0 0 123 0 123 123 0 8 0 namei 1024 8735 0 8735 2 0 2 2 0 8 2 percpumem 16 50 0 0 1 0 1 1 0 8 0 kstatmem 264 25 0 0 2 0 2 2 0 8 0 scxspl 216 9248 0 9248 11 3 8 8 1 8 8 plimitpl 152 129 0 103 2 0 2 2 0 8 0 sigapl 424 775 0 722 7 0 7 7 0 8 0 knotepl 120 514 0 0 16 0 16 16 0 8 0 kqueuepl 224 135 0 126 1 0 1 1 0 8 0 pipepl 344 165 0 138 3 0 3 3 0 8 0 fdescpl 528 759 0 723 4 0 4 4 0 8 0 filepl 160 4236 0 4032 17 2 15 17 0 8 5 lockfpl 104 297 0 295 2 0 2 2 0 8 1 lockfspl 48 43 0 41 1 0 1 1 0 8 0 sessionpl 144 45 0 29 1 0 1 1 0 8 0 pgrppl 48 55 0 31 1 0 1 1 0 8 0 ucredpl 104 677 0 658 1 0 1 1 0 8 0 zombiepl 144 724 0 722 1 0 1 1 0 8 0 processpl 1232 775 0 722 5 0 5 5 0 8 0 procpl 664 1363 0 1305 7 0 7 7 0 8 1 sosppl 176 3 0 3 1 0 1 1 0 8 1 sockpl 752 1488 0 1461 23 11 12 17 0 8 8 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl9k128 9344 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 123 0 0 16 0 16 16 0 8 0 mcl2k 2048 20 0 0 3 0 3 3 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 219 0 0 14 0 14 14 0 8 0 bufpl 280 5399 0 102 379 0 379 379 0 8 0 anonpl 32 8462 0 0 69 0 69 69 0 246 0 amapchunkpl 152 18983 0 18184 34 1 33 33 0 158 0 amappl16 200 3046 0 3019 20 8 12 15 0 8 8 amappl15 192 9 0 9 2 2 0 1 0 8 0 amappl14 184 414 0 413 1 0 1 1 0 8 0 amappl13 176 118 0 108 1 0 1 1 0 8 0 amappl12 168 1031 0 996 2 0 2 2 0 8 0 amappl11 160 5 0 5 1 1 0 1 0 8 0 amappl10 152 58 0 48 1 0 1 1 0 8 0 amappl9 144 269 0 269 1 1 0 1 0 8 0 amappl8 136 102 0 100 1 0 1 1 0 8 0 amappl7 128 144 0 133 1 0 1 1 0 8 0 amappl6 120 149 0 147 1 0 1 1 0 8 0 amappl5 112 97 0 88 1 0 1 1 0 8 0 amappl4 104 271 0 255 1 0 1 1 0 8 0 amappl3 96 3686 0 3559 5 1 4 4 0 8 0 amappl2 88 563 0 508 2 0 2 2 0 8 0 amappl1 80 11949 0 11370 16 1 15 16 0 8 1 amappl 88 5267 0 5087 5 0 5 5 0 92 0 uvmvnodes 80 111 0 0 3 0 3 3 0 8 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 24 0 3 1 0 1 1 0 8 0 uaddrrnd 24 759 0 722 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 759 0 722 1 0 1 1 0 8 0 vmmpekpl 168 8128 0 8094 2 0 2 2 0 8 0 vmmpepl 168 57455 0 55402 104 1 103 104 0 357 8 vmsppl 488 758 0 722 7 1 6 6 0 8 1 rwobjpl 80 19366 0 18384 26 0 26 26 0 8 0 pdppl 4096 1525 0 1444 115 32 83 97 0 8 2 pvpl 32 30247 0 0 244 0 244 244 0 265 0 pmappl 256 758 0 722 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 296 0 38 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8397fff0) 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: 0x7c41fa95fe30, count: 12 ddb{0}> trace x86_ipi_db(ffffffff8397fff0) 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: 0x7c41fa95fe30, count: -3 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b8874) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f54db,ffffffff83447edc,4e2,ffffffff83447f11) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd800913c638) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806c826d80,53169f93000,53169f94000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806c826d80,fffffd806033f3b8,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806c826d80) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806c826d80) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80003c417a20,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff80003c417a20,ffff80003c3ff920,ffff80003c3ff870) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c3ff920) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3ff920) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x761f81eb57e0, count: 4 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b8874) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f54db,ffffffff83447edc,4e2,ffffffff83447f11) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd800913c638) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806c826d80,53169f93000,53169f94000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806c826d80,fffffd806033f3b8,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806c826d80) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806c826d80) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80003c417a20,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff80003c417a20,ffff80003c3ff920,ffff80003c3ff870) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c3ff920) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3ff920) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x761f81eb57e0, count: -11