uvm_fault(0xffffffff82d63498, 0x0, 0, 2) -> e kernel: page fault trap, code=2 Stopped at km_free+0x128: movq $0,0(%rax) TID PID UID PRFLAGS PFLAGS CPU COMMAND *464153 41153 0 0x14000 0x200 0 systqmp km_free(0,1000,ffffffff82a32780,ffffffff82a32798) at km_free+0x128 sys/uvm/uvm_km.c:866 pool_p_free(ffffffff82e1e300,fffffd8072caef90) at pool_p_free+0x14d sys/kern/subr_pool.c:1012 pool_gc_pages(0) at pool_gc_pages+0x255 sys/kern/subr_pool.c:1583 taskq_thread(ffffffff82d1deb0) at taskq_thread+0xe5 sys/kern/kern_task.c:450 end trace frame: 0x0, count: 11 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: uvm_fault(0xffffffff82d63498, 0x0, 0, 2) -> e ddb{0}> trace km_free(0,1000,ffffffff82a32780,ffffffff82a32798) at km_free+0x128 sys/uvm/uvm_km.c:866 pool_p_free(ffffffff82e1e300,fffffd8072caef90) at pool_p_free+0x14d sys/kern/subr_pool.c:1012 pool_gc_pages(0) at pool_gc_pages+0x255 sys/kern/subr_pool.c:1583 taskq_thread(ffffffff82d1deb0) at taskq_thread+0xe5 sys/kern/kern_task.c:450 end trace frame: 0x0, count: -4 ddb{0}> show registers rdi 0x1000 __ALIGN_SIZE rsi 0x28000000 rbp 0xffff80002a11a3e0 rbx 0xffffffff82a32780 kv_page rdx 0 rcx 0xffff80002a0fb7f8 rax 0 r8 0xffff8000375ca950 r9 0 r10 0xb571fc2cd3ba339f r11 0x3d6e971b68985f86 r12 0x1000 __ALIGN_SIZE r13 0 r14 0x1000 __ALIGN_SIZE r15 0x28000000000 rip 0xffffffff81698b48 km_free+0x128 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a11a370 ss 0x10 km_free+0x128: movq $0,0(%rax) ddb{0}> show proc PROC (systqmp) tid=464153 pid=41153 tcnt=1 stat=onproc flags process=14000 proc=200 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 forw=0xffffffffffffffff, list=0xffff80002a0fbaa0,0xffff80002a0fb2b8 process=0xffff8000ffffc000 user=0xffff80002a115000, vmspace=0xffffffff82d63498 estcpu=0, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 65423 205659 92744 0 2 0 syz-executor.6 62409 220777 98049 0 2 0 syz-executor.3 62409 394085 98049 0 2 0x4000000 syz-executor.3 65475 96554 89353 0 2 0 syz-executor.7 65475 74523 89353 0 3 0x4000080 fsleep syz-executor.7 52519 384173 95417 0 2 0 syz-executor.1 52519 449346 95417 0 3 0x4000080 fsleep syz-executor.1 60631 154829 9544 0 2 0 syz-executor.4 60631 257698 9544 0 3 0x4000080 fifow syz-executor.4 60631 368196 9544 0 2 0x4000000 syz-executor.4 25663 134668 43562 0 2 0 syz-executor.0 25663 382382 43562 0 3 0x4000080 pipewr syz-executor.0 25663 498847 43562 0 3 0x4000080 pipewr syz-executor.0 9544 458100 41930 0 2 0x482 syz-executor.4 95417 273363 41930 0 2 0x482 syz-executor.1 8467 247106 41930 0 2 0x2 syz-executor.2 92744 236672 41930 0 2 0x482 syz-executor.6 98049 343346 41930 0 2 0x482 syz-executor.3 56560 260862 41930 0 2 0x482 syz-executor.5 89353 492859 41930 0 2 0x482 syz-executor.7 43562 285916 41930 0 2 0x482 syz-executor.0 90056 372293 1 0 3 0x18100083 ttyin getty 96121 34836 0 0 3 0x14200 acct acct 92161 268126 0 0 3 0x14200 bored sosplice 41930 197473 40480 0 3 0x1a000082 wait syz-fuzzer 41930 194611 40480 0 2 0x1e000482 syz-fuzzer 41930 440499 40480 0 3 0x1e000082 thrsleep syz-fuzzer 41930 474174 40480 0 3 0x1e000082 thrsleep syz-fuzzer 41930 154214 40480 0 3 0x1e000082 wait syz-fuzzer 41930 264787 40480 0 3 0x1e000082 wait syz-fuzzer 41930 291432 40480 0 2 0x1e000002 syz-fuzzer 41930 245661 40480 0 3 0x1e000082 wait syz-fuzzer 41930 148101 40480 0 3 0x1e000082 thrsleep syz-fuzzer 41930 476725 40480 0 3 0x1e000082 wait syz-fuzzer 41930 164054 40480 0 3 0x1e000082 thrsleep syz-fuzzer 41930 194236 40480 0 3 0x1e000082 thrsleep syz-fuzzer 41930 157765 40480 0 3 0x1e000082 wait syz-fuzzer 41930 500324 40480 0 3 0x1e000082 wait syz-fuzzer 41930 73046 40480 0 3 0x1e000082 wait syz-fuzzer 41930 421141 40480 0 2 0x1e000482 syz-fuzzer 40480 205550 70877 0 3 0x810008a sigsusp ksh 70877 463438 50912 0 3 0x1800009a kqread sshd 50912 357513 1 0 3 0x18000088 kqread sshd 21674 290977 70921 74 2 0x19100092 pflogd 70921 99168 1 0 3 0x18000080 netio pflogd 78966 356681 85674 73 3 0x19100090 kqread syslogd 85674 355449 1 0 3 0x18100082 netio syslogd 80106 151185 1 0 3 0x18100080 kqread resolvd 57442 409795 80712 77 3 0x18100092 kqread dhcpleased 60782 505579 80712 77 3 0x18100092 kqread dhcpleased 80712 206728 1 0 3 0x18000080 kqread dhcpleased 56175 238333 0 0 3 0x14200 bored smr 19504 208465 0 0 2 0x14200 zerothread 43666 399611 0 0 3 0x14200 aiodoned aiodoned 11519 25276 0 0 2 0x14600 update 71391 394105 0 0 3 0x14200 cleaner cleaner 76990 470598 0 0 3 0x14200 reaper reaper 7386 148707 0 0 3 0x14200 pgdaemon pagedaemon 62784 363949 0 0 3 0x14200 bored viomb 55025 278724 0 0 3 0x40014200 acpi0 acpi0 89474 239652 0 0 7 0x40014200 idle1 5698 182953 0 0 3 0x14200 bored softnet3 6773 208151 0 0 3 0x14200 bored softnet2 24993 128407 0 0 3 0x14200 bored softnet1 1466 244222 0 0 3 0x14200 bored softnet0 *41153 464153 0 0 7 0x14200 systqmp 58435 223663 0 0 3 0x14200 bored systq 95541 144302 0 0 3 0x14200 tmoslp softclockmp 88708 380469 0 0 2 0x40014200 softclock 69281 436099 0 0 3 0x40014200 idle0 1 244200 0 0 3 0x8080082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 8467 (syz-executor.2) thread 0xffff80002a2152c8 (247106) exclusive rrwlock inode r = 0 (0xfffffd807e1412c0) #0 witness_lock+0x446 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x446 sys/kern/subr_witness.c:1187 #1 rw_enter+0x32a sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x8e sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 vn_lock+0x85 sys/kern/vfs_vnops.c:564 #5 vget+0x1fd sys/kern/vfs_subr.c:676 #6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1201 #8 ufs_lookup+0x1373 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x6e5 sys/kern/vfs_lookup.c:566 #11 namei+0x56a sys/kern/vfs_lookup.c:250 #12 dounlinkat+0x9d sys/kern/vfs_syscalls.c:1855 #13 syscall+0x53b mi_syscall sys/sys/syscall_mi.h:183 [inline] #13 syscall+0x53b sys/arch/amd64/amd64/trap.c:577 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806e9c50a0) #0 witness_lock+0x446 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x446 sys/kern/subr_witness.c:1187 #1 rw_enter+0x32a sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x8e sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 vn_lock+0x85 sys/kern/vfs_vnops.c:564 #5 vfs_lookup+0xd3 sys/kern/vfs_lookup.c:418 #6 namei+0x56a sys/kern/vfs_lookup.c:250 #7 dounlinkat+0x9d sys/kern/vfs_syscalls.c:1855 #8 syscall+0x53b mi_syscall sys/sys/syscall_mi.h:183 [inline] #8 syscall+0x53b sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 Process 41153 (systqmp) thread 0xffff80002a0fb7f8 (464153) shared rwlock pools r = 0 (0xffffffff82d3a3e0) #0 witness_lock+0x446 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x446 sys/kern/subr_witness.c:1187 #1 pool_gc_pages+0x25 sys/kern/subr_pool.c:1560 #2 taskq_thread+0xe5 sys/kern/kern_task.c:450 #3 proc_trampoline+0x10 shared rwlock systqmp r = 0 (0xffffffff82d1df20) #0 witness_lock+0x446 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x446 sys/kern/subr_witness.c:1187 #1 taskq_thread+0xca sys/kern/kern_task.c:446 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10203 6561K 14672K 166960K 31580 0 pcb 15 16K 18K 166960K 869 0 rtable 240 7K 8K 166960K 2376 0 pf 34 9K 10K 166960K 336 0 ifaddr 46 17K 17K 166960K 301 0 ifgroup 59 2K 2K 166960K 548 0 sysctl 4 1K 1K 166960K 6 0 counters 66 36K 36K 166960K 322 0 ioctlops 0 0K 4K 166960K 2296 0 iov 0 0K 28K 166960K 1336 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1523 96K 96K 166960K 7351 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 90 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 1416 0 dirhash 12 2K 2K 166960K 96 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 16 57K 85K 166960K 11309 0 sigio 0 0K 0K 166960K 343 0 proc 70 91K 116K 166960K 2037 0 subproc 104 6K 6K 166960K 588 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 641 0 in_multi 99 7K 7K 166960K 609 0 ether_multi 1 0K 0K 166960K 9 0 mrt 1 0K 0K 166960K 7 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 127 572K 572K 166960K 127 0 exec 0 0K 1K 166960K 2273 0 pfkey data 0 0K 0K 166960K 172 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 499 679K 711K 166960K 106055 0 UVM aobj 131 4K 4K 166960K 135 0 pinsyscall 26 52K 108K 166960K 2527 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 337 0 NDP 13 0K 2K 166960K 237 0 temp 75 6812K 6940K 166960K 76592 0 kqueue 12 18K 26K 166960K 900 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 24 0 0 1 0 1 1 0 8 0 rtpcb 120 570 0 567 4 3 1 3 0 8 0 rtentry 112 744 0 634 6 2 4 4 0 8 0 unpcb 144 9091 0 9073 78 77 1 11 0 8 0 syncache 336 92 0 92 16 15 1 1 0 8 1 sackhl 24 3 6 3 1 1 0 1 0 8 0 tcpqe 32 900 0 900 16 15 1 2 0 8 1 tcpcb 808 2551 0 2533 74 71 3 9 0 8 1 arp 120 154 0 136 1 0 1 1 0 8 0 inpcb 392 8186 0 8164 158 154 4 22 0 8 0 nd6 136 145 0 121 1 0 1 1 0 8 0 pkpcb 40 66 0 66 9 9 0 1 0 8 0 kcovpl 48 45 0 37 1 0 1 1 0 8 0 ppxss 1168 29 0 29 9 9 0 1 0 8 0 pffrag 232 92 0 89 3 2 1 1 0 482 0 pffrnode 88 92 0 89 3 2 1 1 0 8 0 pffrent 40 253 0 250 3 2 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 336 0 305 1 0 1 1 0 8 0 pfstkey 128 342 0 311 2 0 2 2 0 8 0 pfstate 376 342 0 311 9 5 4 4 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 2460 0 2002 52 23 29 33 0 8 0 art_table 32 2461 0 2002 6 2 4 5 0 8 0 art_node 16 698 0 598 1 0 1 1 0 8 0 sysvmsgpl 40 18 0 11 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 1347 0 1337 1 0 1 1 0 8 0 shmpl 112 132 0 4 4 0 4 4 0 8 0 dirhash 1024 73 0 56 3 0 3 3 0 8 0 dino2pl 256 16165 0 14623 97 0 97 97 0 8 0 ffsino 272 16165 0 14623 104 0 104 104 0 8 0 nchpl 144 30862 0 29124 67 0 67 67 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 106410 0 106410 7 6 1 2 0 8 1 percpumem 16 175 0 128 1 0 1 1 0 8 0 vcpupl 2048 242 0 2 31 0 31 31 0 8 0 vmpool 696 254 0 14 23 1 22 23 0 8 0 kstatmem 264 282 0 256 2 0 2 2 0 8 0 scxspl 216 92027 0 92027 14 13 1 8 1 8 1 plimitpl 152 1736 0 1718 1 0 1 1 0 8 0 sigapl 424 11580 0 11530 18 11 7 9 0 8 0 futexpl 64 96810 0 96808 2 1 1 1 0 8 0 knotepl 120 731 0 0 19 0 19 19 0 8 0 kqueuepl 216 2295 0 2287 47 44 3 8 0 8 2 pipepl 320 1868 0 1839 61 58 3 11 0 8 0 fdescpl 496 11540 0 11511 15 10 5 5 0 8 0 filepl 152 66855 0 66608 128 116 12 23 0 8 1 lockfpl 104 3058 0 3056 4 3 1 2 0 8 0 lockfspl 48 925 0 923 1 0 1 1 0 8 0 sessionpl 144 62 0 45 1 0 1 1 0 8 0 pgrppl 48 268 0 251 1 0 1 1 0 8 0 ucredpl 104 10165 0 10153 1 0 1 1 0 8 0 zombiepl 144 11531 0 11530 1 0 1 1 0 8 0 processpl 1136 11580 0 11530 6 1 5 6 0 8 0 procpl 680 28117 0 28045 12 4 8 10 0 8 0 srpgc 96 53 0 53 15 15 0 1 0 8 0 sosppl 168 171 0 168 15 14 1 1 0 8 0 sockpl 584 17995 0 17952 190 186 4 23 0 8 0 mcl64k 65536 8 0 0 1 0 1 1 0 8 0 mcl16k 16384 11 0 0 2 0 2 2 0 8 0 mcl12k 12288 11 0 0 2 0 2 2 0 8 0 mcl9k 9216 5 0 0 1 0 1 1 0 8 0 mcl8k 8192 11 0 0 2 0 2 2 0 8 0 mcl4k 4096 26 0 0 4 0 4 4 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 455 0 0 42 14 28 42 0 8 1 mtagpl 96 500 0 0 10 0 10 10 0 8 0 mbufpl 256 1552 0 0 72 0 72 72 0 8 0 bufpl 280 21626 0 15363 448 0 448 448 0 8 0 anonpl 24 1203666 0 1188980 288 175 113 195 0 186 0 amapchunkpl 152 337522 0 336632 106 61 45 70 0 158 8 amappl16 200 25868 0 25283 152 118 34 46 0 8 0 amappl15 192 65 0 62 1 0 1 1 0 8 0 amappl14 184 335 0 317 2 1 1 2 0 8 0 amappl13 176 27 0 27 2 2 0 1 0 8 0 amappl12 168 12771 0 12738 3 1 2 2 0 8 0 amappl11 160 84 0 68 1 0 1 1 0 8 0 amappl10 152 151 0 136 1 0 1 1 0 8 0 amappl9 144 255 0 255 15 14 1 1 0 8 1 amappl8 136 647 0 516 6 1 5 6 0 8 0 amappl7 128 98 0 82 1 0 1 1 0 8 0 amappl6 120 899 0 872 2 1 1 2 0 8 0 amappl5 112 552 0 536 1 0 1 1 0 8 0 amappl4 104 956 0 911 3 1 2 3 0 8 0 amappl3 96 66021 0 65937 3 0 3 3 0 8 0 amappl2 88 12441 0 12360 4 2 2 4 0 8 0 amappl1 80 51717 0 51179 24 11 13 23 0 8 0 amappl 88 104868 0 104582 11 3 8 8 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 72 134 0 4 3 0 3 3 0 8 0 uaddrrnd 24 11794 0 11525 2 0 2 2 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 11794 0 11525 2 0 2 2 0 8 0 vmmpekpl 168 76728 0 76638 5 0 5 5 0 8 0 vmmpepl 168 699238 0 696398 470 274 196 205 0 357 50 vmsppl 448 11793 0 11525 32 1 31 31 0 8 0 rwobjpl 56 168504 0 160646 127 12 115 115 0 8 0 pdppl 4096 23595 0 23290 746 439 307 311 0 8 2 pvpl 32 48798 0 0 395 1 394 394 0 265 0 pmappl 248 11793 0 11525 18 1 17 17 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1500 0 770 22 0 22 22 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace km_free(0,1000,ffffffff82a32780,ffffffff82a32798) at km_free+0x128 sys/uvm/uvm_km.c:866 pool_p_free(ffffffff82e1e300,fffffd8072caef90) at pool_p_free+0x14d sys/kern/subr_pool.c:1012 pool_gc_pages(0) at pool_gc_pages+0x255 sys/kern/subr_pool.c:1583 taskq_thread(ffffffff82d1deb0) at taskq_thread+0xe5 sys/kern/kern_task.c:450 end trace frame: 0x0, count: -4 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffff800029cebff0) at x86_ipi_db+0x1e 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+0x27 acpicpu_idle() at acpicpu_idle+0x2f1 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800029cebff0) at sched_idle+0x41d sys/kern/kern_sched.c:183 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff800029cebff0) at x86_ipi_db+0x1e 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+0x27 acpicpu_idle() at acpicpu_idle+0x2f1 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800029cebff0) at sched_idle+0x41d sys/kern/kern_sched.c:183 end trace frame: 0x0, count: -5