panic: pool_p_free: tcpcb free list modified: page 0xffff800000edd000; item addr 0xffff800000eddcd0; offset 0x0=0x0 Stopped at db_enter+0x1c: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 21377 77168 0 0x14000 0x200 1 systqmp 35114 43299 0 0x14000 0x40000200 0 softclock db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82904c3b) at panic+0x17b sys/kern/subr_prf.c:198 pool_p_free(ffffffff82e1f948,fffffd807a6d25c8) at pool_p_free+0x1d3 sys/kern/subr_pool.c:986 pool_gc_pages(0) at pool_gc_pages+0x255 sys/kern/subr_pool.c:1583 taskq_thread(ffffffff82c82ed0) at taskq_thread+0xe5 sys/kern/kern_task.c:450 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: tcpcb free list modified: page 0xffff800000edd000; item addr 0xffff800000eddcd0; offset 0x0=0x0 ddb{1}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82904c3b) at panic+0x17b sys/kern/subr_prf.c:198 pool_p_free(ffffffff82e1f948,fffffd807a6d25c8) at pool_p_free+0x1d3 sys/kern/subr_pool.c:986 pool_gc_pages(0) at pool_gc_pages+0x255 sys/kern/subr_pool.c:1583 taskq_thread(ffffffff82c82ed0) at taskq_thread+0xe5 sys/kern/kern_task.c:450 end trace frame: 0x0, count: -5 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a11d4f0 rbx 0xffff800029ceccbf rdx 0 rcx 0xffff8000ffffe290 rax 0xffff800029cebff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xd665dd4f9abed62d r11 0xb5856f854c82ec01 r12 0xffff800029cecac0 r13 0 r14 0 r15 0x1 rip 0xffffffff81aa1e2c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff80002a11d4e0 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb{1}> show proc PROC (systqmp) tid=21377 pid=77168 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=0xffff8000ffffe520,0xffff8000ffffe010 process=0xffff80002a0fd630 user=0xffff80002a118000, vmspace=0xffffffff82e9aad0 estcpu=0, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 18443 8032 8904 0 3 0x8000082 piperd syz-executor.7 20951 446753 1 0 3 0x18100083 ttyin getty 43760 309123 8904 0 3 0x8000082 piperd syz-executor.3 30910 154282 8904 0 3 0x8000082 piperd syz-executor.1 82919 150027 8904 0 3 0x8000082 piperd syz-executor.4 92621 112431 8904 0 3 0x8000082 piperd syz-executor.5 63992 271539 8904 0 3 0x8000082 piperd syz-executor.6 51498 71200 8904 0 3 0x8000082 wait syz-executor.0 40579 487843 0 0 3 0x14200 acct acct 51803 93557 0 0 3 0x14200 bored sosplice 8904 148517 9217 0 3 0x1a000082 thrsleep syz-fuzzer 8904 410651 9217 0 3 0x1e000082 thrsleep syz-fuzzer 8904 383963 9217 0 3 0x1e000082 thrsleep syz-fuzzer 8904 62431 9217 0 3 0x1e000082 wait syz-fuzzer 8904 168898 9217 0 3 0x1e000082 kqread syz-fuzzer 8904 485982 9217 0 3 0x1e000082 thrsleep syz-fuzzer 8904 210783 9217 0 3 0x1e000082 thrsleep syz-fuzzer 8904 233348 9217 0 3 0x1e000082 wait syz-fuzzer 8904 277573 9217 0 3 0x1e000082 thrsleep syz-fuzzer 8904 319247 9217 0 3 0x1e000082 thrsleep syz-fuzzer 8904 254978 9217 0 3 0x1e000082 thrsleep syz-fuzzer 8904 101544 9217 0 3 0x1e000082 wait syz-fuzzer 8904 258986 9217 0 3 0x1e000082 wait syz-fuzzer 8904 478199 9217 0 3 0x1e000082 wait syz-fuzzer 8904 217855 9217 0 3 0x1e000082 wait syz-fuzzer 8904 502846 9217 0 3 0x1e000082 wait syz-fuzzer 9217 218623 13272 0 3 0x810008a sigsusp ksh 13272 138908 20775 0 3 0x1800009a kqread sshd 20775 391346 1 0 3 0x18000088 kqread sshd 12263 78180 40695 74 3 0x19100092 bpf pflogd 40695 6741 1 0 3 0x18000080 sbwait pflogd 47244 140362 86417 73 3 0x19100090 kqread syslogd 86417 467759 1 0 3 0x18100082 sbwait syslogd 27631 330328 1 0 3 0x18100080 kqread resolvd 45121 512108 18444 77 3 0x18100092 kqread dhcpleased 15864 214244 18444 77 3 0x18100092 kqread dhcpleased 18444 310539 1 0 3 0x18000080 kqread dhcpleased 96495 197571 0 0 3 0x14200 bored smr 53487 145226 0 0 3 0x14200 pgzero zerothread 88107 284396 0 0 3 0x14200 aiodoned aiodoned 34113 219016 0 0 3 0x14200 syncer update 3164 100487 0 0 3 0x14200 cleaner cleaner 88201 8691 0 0 3 0x14200 reaper reaper 56143 33614 0 0 3 0x14200 pgdaemon pagedaemon 77352 294559 0 0 3 0x14200 bored viomb 86672 521013 0 0 3 0x40014200 acpi0 acpi0 88433 231630 0 0 3 0x40014200 idle1 84724 240267 0 0 3 0x14200 bored softnet3 32608 180773 0 0 3 0x14200 bored softnet2 7844 126234 0 0 3 0x14200 bored softnet1 62428 170673 0 0 3 0x14200 bored softnet0 *77168 21377 0 0 7 0x14200 systqmp 88487 318462 0 0 3 0x14200 bored systq 14051 301813 0 0 3 0x14200 tmoslp softclockmp 43299 35114 0 0 7 0x40014200 softclock 2294 216959 0 0 3 0x40014200 idle0 1 82100 0 0 3 0x8080082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 77168 (systqmp) thread 0xffff8000ffffe290 (21377) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10192 6484K 6875K 166960K 13584 0 pcb 15 14K 16K 166960K 338 0 rtable 210 6K 7K 166960K 1212 0 pf 31 9K 10K 166960K 159 0 ifaddr 40 14K 16K 166960K 166 0 ifgroup 54 2K 2K 166960K 249 0 sysctl 3 0K 0K 166960K 5 0 counters 62 36K 36K 166960K 162 0 ioctlops 0 0K 4K 166960K 1660 0 iov 0 0K 16K 166960K 161 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1469 92K 93K 166960K 3043 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 38 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 176 0 dirhash 12 2K 2K 166960K 69 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 11 37K 81K 166960K 2451 0 sigio 0 0K 0K 166960K 35 0 proc 70 91K 128K 166960K 1302 0 subproc 104 6K 7K 166960K 366 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 250 0 in_multi 84 6K 7K 166960K 389 0 ether_multi 1 0K 0K 166960K 6 0 mrt 2 0K 0K 166960K 10 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 133 599K 599K 166960K 133 0 exec 0 0K 1K 166960K 893 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 304 78K 100K 166960K 24327 0 UVM aobj 124 3K 3K 166960K 130 0 pinsyscall 35 70K 108K 166960K 4186 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 117 0 NDP 11 0K 2K 166960K 120 0 temp 74 6812K 7448K 166960K 42107 0 kqueue 12 18K 26K 166960K 237 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 495 0 492 4 3 1 3 0 8 0 rtentry 112 392 0 297 5 1 4 4 0 8 0 unpcb 144 1960 0 1944 13 10 3 6 0 8 2 syncache 336 36 0 36 7 6 1 1 0 8 1 tcpqe 32 245 0 245 7 6 1 1 0 8 1 tcpcb 808 869 0 851 24 19 5 9 0 8 2 arp 120 74 0 58 1 0 1 1 0 8 0 inpcb 392 3108 0 3087 35 28 7 13 0 8 3 nd6 136 91 0 71 1 0 1 1 0 8 0 pkpcb 40 78 0 78 6 6 0 1 0 8 0 kcovpl 48 28 0 20 1 0 1 1 0 8 0 ppxss 1168 12 0 12 3 2 1 1 0 8 1 pffrag 232 9 0 6 3 2 1 1 0 482 0 pffrnode 88 9 0 6 3 2 1 1 0 8 0 pffrent 40 59 0 56 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 24 170 0 107 1 0 1 1 0 8 0 pfstkey 128 170 0 107 3 0 3 3 0 8 0 pfstate 376 170 0 107 8 0 8 8 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 1471 0 1074 38 10 28 31 0 8 0 art_table 32 1472 0 1074 4 0 4 4 0 8 0 art_node 16 384 0 297 1 0 1 1 0 8 0 sysvmsgpl 40 47 0 43 1 0 1 1 0 8 0 semapl 112 172 0 162 1 0 1 1 0 8 0 shmpl 112 127 0 6 4 0 4 4 0 8 0 dirhash 1024 55 0 38 3 0 3 3 0 8 0 dino2pl 256 5286 0 3759 96 0 96 96 0 8 0 ffsino 272 5286 0 3759 103 0 103 103 0 8 0 nchpl 144 8633 0 6909 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 30100 0 30100 3 2 1 2 0 8 1 percpumem 16 95 0 50 1 0 1 1 0 8 0 vcpupl 2048 5 0 1 1 0 1 1 0 8 0 vmpool 696 12 0 8 1 0 1 1 0 8 0 kstatmem 264 122 0 100 2 0 2 2 0 8 0 scxspl 216 36783 0 36783 22 18 4 8 1 8 4 plimitpl 152 414 0 398 1 0 1 1 0 8 0 sigapl 424 2753 0 2709 11 2 9 9 0 8 1 futexpl 64 26044 0 26044 2 1 1 1 0 8 1 knotepl 120 186 0 0 6 0 6 6 0 8 0 kqueuepl 216 452 0 444 1 0 1 1 0 8 0 pipepl 320 474 0 447 9 6 3 6 0 8 0 fdescpl 496 2713 0 2689 5 0 5 5 0 8 0 filepl 152 16841 0 16601 31 18 13 18 0 8 2 lockfpl 104 494 0 492 1 0 1 1 0 8 0 lockfspl 48 205 0 203 1 0 1 1 0 8 0 sessionpl 144 46 0 29 1 0 1 1 0 8 0 pgrppl 48 80 0 63 1 0 1 1 0 8 0 ucredpl 104 2505 0 2491 1 0 1 1 0 8 0 zombiepl 144 2711 0 2709 2 1 1 1 0 8 0 processpl 1136 2753 0 2709 6 0 6 6 0 8 1 procpl 656 5952 0 5893 11 2 9 10 0 8 1 srpgc 96 11 0 11 4 3 1 1 0 8 1 sosppl 168 51 0 48 1 0 1 1 0 8 0 sockpl 584 5666 0 5626 36 25 11 17 0 8 6 mcl64k 65536 8 0 0 1 0 1 1 0 8 0 mcl16k 16384 10 0 0 2 0 2 2 0 8 0 mcl12k 12288 11 0 0 2 0 2 2 0 8 0 mcl9k 9216 8 0 0 1 0 1 1 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 13 0 0 1 0 1 1 0 8 0 mcl2k 2048 358 0 0 45 0 45 45 0 8 0 mtagpl 96 32 0 0 1 0 1 1 0 8 0 mbufpl 256 1019 0 0 60 0 60 60 0 8 0 bufpl 280 10848 0 4591 448 0 448 448 0 8 0 anonpl 24 392056 0 386251 150 98 52 113 0 186 0 amapchunkpl 152 82979 0 82388 82 47 35 58 0 158 4 amappl16 200 8518 0 8426 33 24 9 18 0 8 1 amappl15 192 12 0 12 1 1 0 1 0 8 0 amappl14 184 225 0 210 2 1 1 2 0 8 0 amappl13 176 4 0 4 1 1 0 1 0 8 0 amappl12 168 3694 0 3668 3 1 2 2 0 8 0 amappl11 160 59 0 45 1 0 1 1 0 8 0 amappl10 152 87 0 69 1 0 1 1 0 8 0 amappl9 144 301 0 300 2 1 1 1 0 8 0 amappl8 136 481 0 366 5 0 5 5 0 8 0 amappl7 128 59 0 44 1 0 1 1 0 8 0 amappl6 120 665 0 645 2 1 1 2 0 8 0 amappl5 112 291 0 274 1 0 1 1 0 8 0 amappl4 104 832 0 779 4 2 2 4 0 8 0 amappl3 96 14690 0 14624 3 0 3 3 0 8 0 amappl2 88 3334 0 3251 7 4 3 5 0 8 0 amappl1 80 19325 0 18796 24 11 13 23 0 8 0 amappl 88 23416 0 23244 6 0 6 6 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 72 129 0 6 3 0 3 3 0 8 0 uaddrrnd 24 2726 0 2698 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2726 0 2698 1 0 1 1 0 8 0 vmmpekpl 168 23911 0 23846 4 0 4 4 0 8 0 vmmpepl 168 184396 0 182563 150 42 108 119 0 357 7 vmsppl 440 2725 0 2698 6 1 5 5 0 8 1 rwobjpl 56 55161 0 47915 105 1 104 104 0 8 0 pdppl 4096 5459 0 5400 212 135 77 78 0 8 18 pvpl 32 48782 0 0 397 3 394 395 0 265 0 pmappl 248 2725 0 2698 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 644 0 200 13 0 13 13 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffffffff82d3bff0) 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 __mp_lock(ffffffff82d68790) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82d68790) at __mp_lock+0x122 sys/kern/kern_lock.c:147 __mp_acquire_count(ffffffff82d68790,1) at __mp_acquire_count+0x48 sys/kern/kern_lock.c:227 mi_switch() at mi_switch+0x489 sys/kern/sched_bsd.c:470 sleep_finish(0,1) at sleep_finish+0x194 sys/kern/kern_synch.c:414 msleep(ffffffff82e22390,ffffffff82cee260,0,ffffffff8295650b,0) at msleep+0xeb sys/kern/kern_synch.c:249 softclock_thread(ffff8000ffffea40) at softclock_thread+0xcf sys/kern/kern_timeout.c:810 end trace frame: 0x0, count: 6 ddb{0}> trace x86_ipi_db(ffffffff82d3bff0) 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 __mp_lock(ffffffff82d68790) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82d68790) at __mp_lock+0x122 sys/kern/kern_lock.c:147 __mp_acquire_count(ffffffff82d68790,1) at __mp_acquire_count+0x48 sys/kern/kern_lock.c:227 mi_switch() at mi_switch+0x489 sys/kern/sched_bsd.c:470 sleep_finish(0,1) at sleep_finish+0x194 sys/kern/kern_synch.c:414 msleep(ffffffff82e22390,ffffffff82cee260,0,ffffffff8295650b,0) at msleep+0xeb sys/kern/kern_synch.c:249 softclock_thread(ffff8000ffffea40) at softclock_thread+0xcf sys/kern/kern_timeout.c:810 end trace frame: 0x0, count: -9 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x1c: addq $0x8,%rsp db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82904c3b) at panic+0x17b sys/kern/subr_prf.c:198 pool_p_free(ffffffff82e1f948,fffffd807a6d25c8) at pool_p_free+0x1d3 sys/kern/subr_pool.c:986 pool_gc_pages(0) at pool_gc_pages+0x255 sys/kern/subr_pool.c:1583 taskq_thread(ffffffff82c82ed0) at taskq_thread+0xe5 sys/kern/kern_task.c:450 end trace frame: 0x0, count: 10 ddb{1}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82904c3b) at panic+0x17b sys/kern/subr_prf.c:198 pool_p_free(ffffffff82e1f948,fffffd807a6d25c8) at pool_p_free+0x1d3 sys/kern/subr_pool.c:986 pool_gc_pages(0) at pool_gc_pages+0x255 sys/kern/subr_pool.c:1583 taskq_thread(ffffffff82c82ed0) at taskq_thread+0xe5 sys/kern/kern_task.c:450 end trace frame: 0x0, count: -5