panic: pool_p_free: rttmr free list modified: page 0xfffffd8072da4000; item addr 0xfffffd8072da4d58; offset 0x10=0x8390e260 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 194519 88780 0 0x2 0x1 0 syz-executor *253711 44140 0 0x14000 0x200 1 systqmp db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83381b49) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_p_free(ffffffff83986408,fffffd8072da4f90) at pool_p_free+0x2d1 sys/kern/subr_pool.c:986 pool_gc_pages(0) at pool_gc_pages+0x357 sys/kern/subr_pool.c:1587 taskq_thread(ffffffff838498a0) at taskq_thread+0x157 sys/kern/kern_task.c:446 end trace frame: 0x0, count: 10 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: pool_p_free: rttmr free list modified: page 0xfffffd8072da4000; item addr 0xfffffd8072da4d58; offset 0x10=0x8390e260 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83381b49) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_p_free(ffffffff83986408,fffffd8072da4f90) at pool_p_free+0x2d1 sys/kern/subr_pool.c:986 pool_gc_pages(0) at pool_gc_pages+0x357 sys/kern/subr_pool.c:1587 taskq_thread(ffffffff838498a0) at taskq_thread+0x157 sys/kern/kern_task.c:446 end trace frame: 0x0, count: -5 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a219fa0 rbx 0xffff8000299eeddf rdx 0 rcx 0xffff8000ffffe530 rax 0xffff8000299edff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x5d783f8054d69ef3 r11 0xfaa657a397c43d4 r12 0xffff8000299eebe0 r13 0 r14 0 r15 0x1 rip 0xffffffff822eaa15 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a219f90 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (systqmp) tid=253711 pid=44140 tcnt=1 stat=onproc flags process=14000 proc=200 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffffea60,0xffff8000ffffe2a8 process=0xffff8000ffff89a0 user=0xffff80002a215000, vmspace=0xffffffff839e07b8 estcpu=0, cpticks=2, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 71034 15917 35704 0 2 0x1 syz-executor 71034 278543 35704 0 3 0x4000080 fsleep syz-executor 71034 9105 35704 0 3 0x4000080 fsleep syz-executor 45255 485265 39197 0 2 0 syz-executor 45255 289139 39197 0 3 0x4000080 piperd syz-executor 45255 469934 39197 0 2 0x4000000 syz-executor 45255 505874 39197 0 3 0x4000080 fsleep syz-executor 39197 276089 38067 0 3 0x82 nanoslp syz-executor 92449 351567 38067 0 3 0x82 piperd syz-executor 88780 194519 38067 0 7 0x3 syz-executor 6461 292241 29255 0 3 0x82 sbwait sshd-session 25790 257902 38067 0 3 0x82 nanoslp syz-executor 55382 128133 0 0 3 0x14200 bored sosplice 35704 334258 38067 0 3 0x82 nanoslp syz-executor 16525 55758 38067 0 2 0x3 syz-executor 85412 42431 38067 0 3 0x2 biowait syz-executor 38067 518309 36589 0 3 0x82 wait syz-executor 36589 17338 71235 0 3 0x10008a sigsusp ksh 71235 40431 24011 0 3 0x98 kqread sshd-session 24011 128776 29255 0 3 0x92 kqread sshd-session 75804 228788 1 0 3 0x100083 ttyin getty 29255 210357 1 0 3 0x88 kqread sshd 65283 307109 85977 74 3 0x1100092 bpf pflogd 85977 501656 1 0 3 0x80 sbwait pflogd 39734 258852 47126 73 3 0x1100090 kqread syslogd 47126 495717 1 0 3 0x100082 sbwait syslogd 34299 450973 1 0 3 0x100080 kqread resolvd 30040 236373 58052 77 3 0x100092 kqread dhcpleased 66873 172832 58052 77 3 0x100092 kqread dhcpleased 58052 330129 1 0 3 0x80 kqread dhcpleased 28588 200347 0 0 3 0x14200 bored smr 93548 77423 0 0 2 0x14200 zerothread 41411 173137 0 0 3 0x14200 aiodoned aiodoned 89415 234622 0 0 3 0x14200 syncer update 76184 150010 0 0 3 0x14200 cleaner cleaner 67935 189463 0 0 3 0x14200 reaper reaper 43006 127773 0 0 3 0x14200 pgdaemon pagedaemon 53787 234691 0 0 3 0x14200 bored viomb 86176 42939 0 0 3 0x40014200 acpi0 acpi0 66894 443653 0 0 3 0x40014200 idle1 54385 452484 0 0 3 0x14200 bored softnet1 34199 467001 0 0 3 0x14200 bored softnet0 *44140 253711 0 0 7 0x14200 systqmp 91719 417247 0 0 3 0x14200 bored systq 40510 170691 0 0 3 0x14200 tmoslp softclockmp 5783 249140 0 0 3 0x40014200 tmoslp softclock 75762 3655 0 0 3 0x40014200 idle0 1 228297 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 88780 (syz-executor) thread 0xffff80003c45c558 (194519) Process 85412 (syz-executor) thread 0xffff80002a272a70 (42431) Process 44140 (systqmp) thread 0xffff8000ffffe530 (253711) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10225 11118K 11309K 166960K 12879 0 pcb 19 14K 15K 166960K 244 0 rtable 211 11K 12K 166960K 833 0 pf 40 18K 67486K 166960K 243 0 ifaddr 41 7K 7K 166960K 210 0 ifgroup 62 2K 2K 166960K 295 0 sysctl 4 1K 9K 166960K 15 0 counters 72 37K 37K 166960K 290 0 ioctlops 0 0K 4K 166960K 1779 0 iov 0 0K 28K 166960K 95 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1558 98K 98K 166960K 3095 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 616K 616K 166960K 7 0 VM map 2 1K 1K 166960K 2 0 sem 21 20K 20K 166960K 60 0 dirhash 12 2K 3K 166960K 147 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 15 53K 240K 166960K 1935 0 sigio 0 0K 0K 166960K 25 0 proc 75 131K 180K 166960K 1338 0 subproc 72 4K 4K 166960K 281 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 249 0 in_multi 74 5K 7K 166960K 392 0 ether_multi 1 0K 0K 166960K 22 0 mrt 2 0K 0K 166960K 15 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 121 546K 546K 166960K 121 0 exec 0 0K 1K 166960K 940 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 245 160K 177K 166960K 18123 0 UVM aobj 47 4K 4K 166960K 52 0 pinsyscall 42 84K 104K 166960K 3668 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 88 0 NDP 16 0K 2K 166960K 161 0 temp 76 8650K 8904K 166960K 69220 0 kqueue 13 20K 30K 166960K 329 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 120 264 0 261 4 3 1 3 0 8 0 rtentry 176 326 0 249 5 0 5 5 0 8 0 unpcb 144 903 0 884 5 4 1 4 0 8 0 syncache 336 9 0 9 3 3 0 1 0 8 0 tcpqe 32 2 0 2 2 2 0 1 0 8 0 tcpcb 736 567 0 559 16 12 4 7 0 8 3 arp 136 37 0 26 1 0 1 1 0 8 0 inpcb 328 1871 0 1857 17 12 5 7 0 8 3 nd6 152 70 0 53 1 0 1 1 0 8 0 pkpcb 40 7 0 7 4 3 1 1 0 8 1 kcovpl 48 31 0 23 1 0 1 1 0 8 0 ppxss 1192 81 0 80 2 1 1 1 0 8 0 pppxif 1504 1 0 1 1 1 0 1 0 8 0 pffrag 232 14 0 8 1 0 1 1 0 482 0 pffrnode 88 13 0 7 1 0 1 1 0 8 0 pffrent 40 25 0 19 1 0 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 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 136 0 54 1 0 1 1 0 8 0 pfstkey 128 213 0 131 4 0 4 4 0 8 0 pfstate 384 187 0 106 10 0 10 10 0 8 0 pfrule 1344 24 0 19 2 1 1 2 0 8 0 rttmr 136 3 0 3 3 3 0 1 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 1525 0 1195 30 9 21 28 0 8 0 art_table 40 1529 0 1195 5 0 5 5 0 8 0 art_node 32 326 0 260 1 0 1 1 0 8 0 sysvmsgpl 40 17 0 10 1 0 1 1 0 8 0 semupl 112 2 0 2 2 2 0 1 0 8 0 semapl 112 54 0 35 1 0 1 1 0 8 0 shmpl 112 49 0 5 2 0 2 2 0 8 0 dirhash 1024 107 0 90 3 0 3 3 0 8 0 dino2pl 256 4632 0 3077 98 0 98 98 0 8 0 ffsino 296 4632 0 3077 120 0 120 120 0 8 0 nchpl 144 6776 0 5018 66 0 66 66 0 8 0 rtmask 32 17 0 17 2 2 0 1 0 8 0 vnodes 216 5762 0 0 321 0 321 321 0 8 0 namei 1024 24625 0 24624 6 5 1 3 0 8 0 percpumem 16 160 0 109 1 0 1 1 0 8 0 kstatmem 264 202 0 170 5 2 3 3 0 8 0 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 5 0 5 3 2 1 1 0 8 1 scxspl 216 55262 0 55260 10 9 1 8 1 8 0 plimitpl 152 521 0 504 1 0 1 1 0 8 0 sigapl 424 2200 0 2153 7 0 7 7 0 8 0 knotepl 120 551 0 0 17 0 17 17 0 8 0 kqueuepl 224 763 0 753 9 8 1 5 0 8 0 pipepl 344 324 0 295 3 0 3 3 0 8 0 fdescpl 528 2174 0 2144 3 0 3 3 0 8 0 filepl 160 12169 0 11942 22 9 13 16 0 8 2 lockfpl 104 737 0 734 2 1 1 2 0 8 0 lockfspl 48 229 0 226 1 0 1 1 0 8 0 sessionpl 144 51 0 41 1 0 1 1 0 8 0 pgrppl 48 91 0 73 1 0 1 1 0 8 0 ucredpl 104 1676 0 1661 1 0 1 1 0 8 0 zombiepl 144 2693 0 2689 1 0 1 1 0 8 0 processpl 1232 2200 0 2153 6 1 5 5 0 8 0 procpl 664 4809 0 4757 7 1 6 7 0 8 0 sosppl 168 16 0 16 5 4 1 1 0 8 1 sockpl 752 3085 0 3049 29 21 8 18 0 8 2 mcl64k 65536 16 0 0 2 0 2 2 0 8 0 mcl16k 16384 11 0 0 2 0 2 2 0 8 0 mcl12k 12288 6 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 109 0 0 14 0 14 14 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 31 0 0 4 0 4 4 0 8 0 mtagpl 96 6 0 0 1 0 1 1 0 8 0 mbufpl 256 255 0 0 14 0 14 14 0 8 0 bufpl 280 22982 0 16839 440 0 440 440 0 8 0 anonpl 32 14143 0 0 114 0 114 114 0 246 0 amapchunkpl 152 59974 0 59430 42 14 28 31 0 158 3 amappl16 200 7515 0 7414 84 71 13 33 0 8 2 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 171 0 158 1 0 1 1 0 8 0 amappl13 176 6 0 6 1 1 0 1 0 8 0 amappl12 168 3241 0 3210 4 2 2 3 0 8 0 amappl11 160 58 0 44 1 0 1 1 0 8 0 amappl10 152 6 0 6 1 1 0 1 0 8 0 amappl9 144 254 0 254 1 1 0 1 0 8 0 amappl8 136 26 0 23 1 0 1 1 0 8 0 amappl7 128 233 0 220 1 0 1 1 0 8 0 amappl6 120 418 0 414 1 0 1 1 0 8 0 amappl5 112 213 0 203 1 0 1 1 0 8 0 amappl4 104 361 0 339 1 0 1 1 0 8 0 amappl3 96 10644 0 10550 4 1 3 3 0 8 0 amappl2 88 2505 0 2422 3 1 2 3 0 8 0 amappl1 80 18872 0 18190 17 1 16 17 0 8 0 amappl 88 16758 0 16591 5 0 5 5 0 92 0 uvmvnodes 80 5762 0 0 118 0 118 118 0 8 0 dma32768 32768 1 0 1 1 1 0 1 0 8 0 dma8192 8192 1 0 1 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma2048 2048 1 0 1 1 1 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 128 254 0 254 2 2 0 1 0 8 0 dma64 64 7 0 7 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 51 0 5 1 0 1 1 0 8 0 uaddrrnd 24 2174 0 2144 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2174 0 2144 1 0 1 1 0 8 0 vmmpekpl 168 17245 0 17190 3 0 3 3 0 8 0 vmmpepl 168 146010 0 143883 134 25 109 120 0 357 1 vmsppl 488 2173 0 2144 5 0 5 5 0 8 0 rwobjpl 80 45759 0 38839 144 1 143 143 0 8 1 pdppl 4096 4356 0 4288 139 63 76 86 0 8 8 pvpl 32 25374 0 0 207 2 205 205 0 265 0 pmappl 256 2173 0 2144 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 346 0 98 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8378fff0) 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 __mp_lock(ffffffff839db290) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839db290) at __mp_lock+0x199 sys/kern/kern_lock.c:165 intr_handler(ffff80002a334a60,ffff80000007aa80) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff839db290) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839db290) at __mp_lock+0x192 sys/kern/kern_lock.c:165 ktrsyscall(ffff80003c45c558,5b,10,ffff80002a334d10) at ktrsyscall+0x2c7 ktrwrite sys/kern/kern_ktrace.c:-1 [inline] ktrsyscall(ffff80003c45c558,5b,10,ffff80002a334d10) at ktrsyscall+0x2c7 sys/kern/kern_ktrace.c:183 syscall(ffff80002a334d10) at syscall+0x304 mi_syscall sys/sys/syscall_mi.h:154 [inline] syscall(ffff80002a334d10) at syscall+0x304 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x75309b2c4c00, count: 5 ddb{0}> trace x86_ipi_db(ffffffff8378fff0) 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 __mp_lock(ffffffff839db290) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839db290) at __mp_lock+0x199 sys/kern/kern_lock.c:165 intr_handler(ffff80002a334a60,ffff80000007aa80) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff839db290) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839db290) at __mp_lock+0x192 sys/kern/kern_lock.c:165 ktrsyscall(ffff80003c45c558,5b,10,ffff80002a334d10) at ktrsyscall+0x2c7 ktrwrite sys/kern/kern_ktrace.c:-1 [inline] ktrsyscall(ffff80003c45c558,5b,10,ffff80002a334d10) at ktrsyscall+0x2c7 sys/kern/kern_ktrace.c:183 syscall(ffff80002a334d10) at syscall+0x304 mi_syscall sys/sys/syscall_mi.h:154 [inline] syscall(ffff80002a334d10) at syscall+0x304 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x75309b2c4c00, count: -10 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(ffffffff83381b49) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_p_free(ffffffff83986408,fffffd8072da4f90) at pool_p_free+0x2d1 sys/kern/subr_pool.c:986 pool_gc_pages(0) at pool_gc_pages+0x357 sys/kern/subr_pool.c:1587 taskq_thread(ffffffff838498a0) at taskq_thread+0x157 sys/kern/kern_task.c:446 end trace frame: 0x0, count: 10 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83381b49) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_p_free(ffffffff83986408,fffffd8072da4f90) at pool_p_free+0x2d1 sys/kern/subr_pool.c:986 pool_gc_pages(0) at pool_gc_pages+0x357 sys/kern/subr_pool.c:1587 taskq_thread(ffffffff838498a0) at taskq_thread+0x157 sys/kern/kern_task.c:446 end trace frame: 0x0, count: -5