panic: pool_p_free: pffrnode free list modified: page 0xfffffd807ead8000; item addr 0xfffffd807ead8008; offset 0x0=0x0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *287436 49442 0 0x14000 0x200 1 systqmp 61052 82823 0 0x14000 0x40000200 0 softclock db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8225424c) at panic+0x15c sys/kern/subr_prf.c:207 pool_p_free(ffffffff826819e0,fffffd807ead8f90) at pool_p_free+0x1de sys/kern/subr_pool.c:983 pool_gc_pages(0) at pool_gc_pages+0x255 sys/kern/subr_pool.c:1578 taskq_thread(ffffffff824c8a70) at taskq_thread+0x9c sys/kern/kern_task.c:369 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 pool_p_free: pffrnode free list modified: page 0xfffffd807ead8000; item addr 0xfffffd807ead8008; offset 0x0=0x0 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8225424c) at panic+0x15c sys/kern/subr_prf.c:207 pool_p_free(ffffffff826819e0,fffffd807ead8f90) at pool_p_free+0x1de sys/kern/subr_pool.c:983 pool_gc_pages(0) at pool_gc_pages+0x255 sys/kern/subr_pool.c:1578 taskq_thread(ffffffff824c8a70) at taskq_thread+0x9c sys/kern/kern_task.c:369 end trace frame: 0x0, count: -5 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020e335d0 rbx 0xffff800020e33680 rdx 0xffff800020e189c0 rcx 0 rax 0 r8 0xffffffff81b4951f kprintf+0x16f r9 0x1 r10 0x25 r11 0x31f79fcf54624744 r12 0x3000000008 r13 0xffff800020e335e0 r14 0x100 r15 0x1 rip 0xffffffff818b7698 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020e335c0 ss 0 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (systqmp) pid=287436 stat=onproc flags process=14000 proc=200 pri=32, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff800020e18c30,0xffff800020e18280 process=0xffff800020e1a3d8 user=0xffff800020e2e000, vmspace=0xffffffff8265ff28 estcpu=0, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 66353 66132 94340 0 2 0 syz-executor.1 35719 316759 49985 0 3 0x82 piperd syz-executor.0 58389 459959 0 0 3 0x14200 acct acct 96307 143309 1 0 3 0x100083 ttyin getty 51764 426256 0 0 3 0x14200 bored sosplice 94340 184119 49985 0 3 0x82 nanosleep syz-executor.1 49985 149631 4370 0 3 0x82 thrsleep syz-fuzzer 49985 511118 4370 0 2 0x4000482 syz-fuzzer 49985 116356 4370 0 3 0x4000082 thrsleep syz-fuzzer 49985 3758 4370 0 3 0x4000082 thrsleep syz-fuzzer 49985 23039 4370 0 3 0x4000082 thrsleep syz-fuzzer 49985 366021 4370 0 3 0x4000082 thrsleep syz-fuzzer 49985 162413 4370 0 3 0x4000082 thrsleep syz-fuzzer 49985 24777 4370 0 3 0x4000082 thrsleep syz-fuzzer 49985 404735 4370 0 2 0x4000002 syz-fuzzer 49985 521628 4370 0 3 0x4000082 kqread syz-fuzzer 4370 84407 30046 0 3 0x10008a pause ksh 30046 230806 95705 0 3 0x92 select sshd 95705 140652 1 0 3 0x80 select sshd 12569 187677 93793 74 2 0x100492 pflogd 93793 144072 1 0 3 0x80 netio pflogd 96882 120084 25802 73 3 0x100090 kqread syslogd 25802 116216 1 0 3 0x100082 netio syslogd 22644 249601 1 77 3 0x100090 poll dhclient 74071 267078 1 0 3 0x80 poll dhclient 75974 339592 0 0 3 0x14200 bored smr 1275 10162 0 0 2 0x14200 zerothread 88590 490628 0 0 3 0x14200 aiodoned aiodoned 15604 314004 0 0 3 0x14200 syncer update 8968 37295 0 0 3 0x14200 cleaner cleaner 65984 81240 0 0 3 0x14200 reaper reaper 36641 263114 0 0 3 0x14200 pgdaemon pagedaemon 13939 190661 0 0 3 0x14200 bored crynlk 6052 385689 0 0 3 0x14200 bored crypto 42741 100417 0 0 3 0x40014200 acpi0 acpi0 87625 166433 0 0 3 0x40014200 idle1 4302 54778 0 0 2 0x14200 softnet *49442 287436 0 0 7 0x14200 systqmp 40327 114399 0 0 3 0x14200 bored systq 82823 61052 0 0 7 0x40014200 softclock 84460 509892 0 0 3 0x40014200 idle0 1 142541 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd807effe0f8) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 mtx_enter_try+0x102 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 pmap_enter+0x1bc rcr3 machine/cpufunc.h:141 [inline] #3 pmap_enter+0x1bc pmap_map_ptes sys/arch/amd64/amd64/pmap.c:414 [inline] #3 pmap_enter+0x1bc sys/arch/amd64/amd64/pmap.c:2678 #4 uvm_fault+0x10f0 sys/uvm/uvm_fault.c:1217 #5 pageflttrap+0x1b8 sys/arch/amd64/amd64/trap.c:221 #6 usertrap+0x21a sys/arch/amd64/amd64/trap.c:384 #7 recall_trap+0x8 Process 66353 (syz-executor.1) thread 0xffff800020ed7d58 (66132) shared rwlock vmmaplk r = 0 (0xfffffd807efff748) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1448 #2 uvm_fault+0xd85 sys/uvm/uvm_fault.c:524 #3 pageflttrap+0x1b8 sys/arch/amd64/amd64/trap.c:221 #4 usertrap+0x21a sys/arch/amd64/amd64/trap.c:384 #5 recall_trap+0x8 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8264d2a8) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 pageflttrap+0x7f sys/arch/amd64/amd64/trap.c:180 #2 usertrap+0x21a sys/arch/amd64/amd64/trap.c:384 #3 recall_trap+0x8 Process 49442 (systqmp) thread 0xffff800020e189c0 (287436) shared rwlock pools r = 0 (0xffffffff82494360) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 pool_gc_pages+0x21 sys/kern/subr_pool.c:1555 #2 taskq_thread+0x9c sys/kern/kern_task.c:369 #3 proc_trampoline+0x1c shared rwlock systqmp r = 0 (0xffffffff824c8ad0) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 taskq_thread+0x8f sys/kern/kern_task.c:368 #2 proc_trampoline+0x1c ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9508 6412K 6737K 78643K 11069 0 pcb 13 8K 8K 78643K 100 0 rtable 99 3K 3K 78643K 310 0 ifaddr 62 13K 13K 78643K 115 0 counters 43 33K 34K 78643K 55 0 ioctlops 0 0K 4K 78643K 1485 0 iov 0 0K 16K 78643K 46 0 mount 1 1K 1K 78643K 1 0 vnodes 1220 77K 77K 78643K 1416 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 4 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 31 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1823 197K 290K 78643K 12980 0 file desc 5 13K 25K 78643K 314 0 sigio 0 0K 0K 78643K 10 0 proc 65 63K 95K 78643K 525 0 subproc 32 2K 2K 78643K 51 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 27 0 in_multi 45 2K 2K 78643K 106 0 ether_multi 1 0K 0K 78643K 14 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 67 307K 307K 78643K 67 0 exec 0 0K 1K 78643K 245 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 120 22K 38K 78643K 2009 0 UVM aobj 11 6K 6K 78643K 12 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 67 0 NDP 10 0K 0K 78643K 25 0 temp 90 3041K 3105K 78643K 3186 0 kqueue 3 4K 8K 78643K 10 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 8 0 2 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 37 0 35 1 0 1 1 0 8 0 rtentry 112 68 0 27 2 0 2 2 0 8 0 unpcb 120 184 0 174 1 0 1 1 0 8 0 syncache 264 5 0 5 2 2 0 1 0 8 0 tcpqe 32 322 0 322 1 1 0 1 0 8 0 tcpcb 544 133 0 129 1 0 1 1 0 8 0 inpcb 280 679 0 672 3 1 2 2 0 8 1 nd6 48 12 0 8 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 7 0 7 2 2 0 1 0 482 0 pffrnode 88 7 0 7 2 2 0 1 0 8 0 pffrent 40 189 0 189 2 1 1 1 0 8 1 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 56 0 12 1 0 1 1 0 8 0 pfstkey 112 56 0 12 2 0 2 2 0 8 0 pfstate 328 56 0 12 4 0 4 4 0 8 0 pfrule 1360 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 256 308 0 132 13 2 11 12 0 8 0 art_table 32 309 0 132 2 0 2 2 0 8 0 art_node 16 67 0 29 1 0 1 1 0 8 0 sysvmsgpl 40 10 0 10 2 2 0 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 29 0 19 1 0 1 1 0 8 0 shmpl 112 10 0 1 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1826 0 419 90 1 89 89 0 8 0 ffsino 272 1826 0 419 95 0 95 95 0 8 0 nchpl 144 2421 0 825 60 0 60 60 0 8 0 uvmvnodes 72 2011 0 0 37 0 37 37 0 8 0 vnodes 208 2011 0 0 106 0 106 106 0 8 0 namei 1024 7091 0 7091 1 0 1 1 0 8 1 percpumem 16 38 0 6 1 0 1 1 0 8 0 vmpool 560 2 0 2 1 1 0 1 0 8 0 scxspl 192 6459 0 6459 7 6 1 6 0 8 1 plimitpl 152 44 0 36 1 0 1 1 0 8 0 sigapl 424 529 0 496 4 0 4 4 0 8 0 futexpl 56 4742 0 4742 1 0 1 1 0 8 1 knotepl 112 85 0 66 1 0 1 1 0 8 0 kqueuepl 144 55 0 53 1 0 1 1 0 8 0 pipelkpl 48 119 0 109 1 0 1 1 0 8 0 pipepl 120 238 0 219 1 0 1 1 0 8 0 fdescpl 496 512 0 496 3 0 3 3 0 8 0 filepl 152 3466 0 3366 6 1 5 6 0 8 0 lockfpl 104 72 0 71 1 0 1 1 0 8 0 lockfspl 48 29 0 28 1 0 1 1 0 8 0 sessionpl 112 20 0 9 1 0 1 1 0 8 0 pgrppl 48 22 0 11 1 0 1 1 0 8 0 ucredpl 96 347 0 338 1 0 1 1 0 8 0 zombiepl 144 496 0 496 1 0 1 1 0 8 1 processpl 984 529 0 496 5 0 5 5 0 8 0 procpl 624 1188 0 1146 4 0 4 4 0 8 0 sosppl 128 13 0 13 2 2 0 1 0 8 0 sockpl 400 908 0 889 7 3 4 4 0 8 2 mcl64k 65536 15 0 0 2 0 2 2 0 8 0 mcl12k 12288 7 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 6 0 0 1 0 1 1 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 184 0 0 22 0 22 22 0 8 0 mtagpl 80 25 0 0 1 0 1 1 0 8 0 mbufpl 256 267 0 0 15 0 15 15 0 8 0 bufpl 280 3688 0 133 254 0 254 254 0 8 0 anonpl 16 67615 0 54648 79 10 69 74 0 124 11 amapchunkpl 152 3455 0 3320 27 12 15 20 0 158 9 amappl16 192 2168 0 1411 51 9 42 51 0 8 3 amappl15 184 9 0 7 1 0 1 1 0 8 0 amappl14 176 178 0 173 1 0 1 1 0 8 0 amappl13 168 188 0 185 1 0 1 1 0 8 0 amappl12 160 12 0 9 2 1 1 1 0 8 0 amappl11 152 65 0 49 1 0 1 1 0 8 0 amappl10 144 118 0 114 1 0 1 1 0 8 0 amappl9 136 392 0 390 1 0 1 1 0 8 0 amappl8 128 375 0 346 2 0 2 2 0 8 0 amappl7 120 227 0 215 1 0 1 1 0 8 0 amappl6 112 33 0 22 1 0 1 1 0 8 0 amappl5 104 259 0 242 1 0 1 1 0 8 0 amappl4 96 666 0 634 1 0 1 1 0 8 0 amappl3 88 270 0 262 1 0 1 1 0 8 0 amappl2 80 3072 0 3005 2 0 2 2 0 8 0 amappl1 72 21732 0 21294 23 13 10 18 0 8 0 amappl 80 1456 0 1412 2 0 2 2 0 84 0 dma4096 4096 1 0 1 1 1 0 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 64 11 0 1 1 0 1 1 0 8 0 uaddrrnd 24 514 0 498 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 514 0 498 1 0 1 1 0 8 0 vmmpekpl 168 8079 0 8048 2 0 2 2 0 8 0 vmmpepl 168 70073 0 68180 132 19 113 113 0 357 24 vmsppl 368 513 0 498 2 0 2 2 0 8 0 pdppl 4096 1036 0 996 6 0 6 6 0 8 0 pvpl 32 209580 0 193473 184 10 174 179 0 265 33 pmappl 232 513 0 498 2 1 1 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 268 0 9 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff82520ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352 x86_ipi_handler() at x86_ipi_handler+0xc6 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff8264d0a0) at __mp_lock+0x127 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff8264d0a0) at __mp_lock+0x127 sys/kern/kern_lock.c:147 __mp_acquire_count(ffffffff8264d0a0,1) at __mp_acquire_count+0x51 sys/kern/kern_lock.c:227 mi_switch() at mi_switch+0x392 sys/kern/sched_bsd.c:435 sleep_finish(ffff800020e27728,1) at sleep_finish+0x113 sys/kern/kern_synch.c:418 softclock_thread(ffff800020e19110) at softclock_thread+0x103 sys/kern/kern_timeout.c:575 end trace frame: 0x0, count: 7 ddb{0}> trace x86_ipi_db(ffffffff82520ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352 x86_ipi_handler() at x86_ipi_handler+0xc6 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff8264d0a0) at __mp_lock+0x127 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff8264d0a0) at __mp_lock+0x127 sys/kern/kern_lock.c:147 __mp_acquire_count(ffffffff8264d0a0,1) at __mp_acquire_count+0x51 sys/kern/kern_lock.c:227 mi_switch() at mi_switch+0x392 sys/kern/sched_bsd.c:435 sleep_finish(ffff800020e27728,1) at sleep_finish+0x113 sys/kern/kern_synch.c:418 softclock_thread(ffff800020e19110) at softclock_thread+0x103 sys/kern/kern_timeout.c:575 end trace frame: 0x0, count: -8 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x18: addq $0x8,%rsp db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8225424c) at panic+0x15c sys/kern/subr_prf.c:207 pool_p_free(ffffffff826819e0,fffffd807ead8f90) at pool_p_free+0x1de sys/kern/subr_pool.c:983 pool_gc_pages(0) at pool_gc_pages+0x255 sys/kern/subr_pool.c:1578 taskq_thread(ffffffff824c8a70) at taskq_thread+0x9c sys/kern/kern_task.c:369 end trace frame: 0x0, count: 10 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8225424c) at panic+0x15c sys/kern/subr_prf.c:207 pool_p_free(ffffffff826819e0,fffffd807ead8f90) at pool_p_free+0x1de sys/kern/subr_pool.c:983 pool_gc_pages(0) at pool_gc_pages+0x255 sys/kern/subr_pool.c:1578 taskq_thread(ffffffff824c8a70) at taskq_thread+0x9c sys/kern/kern_task.c:369 end trace frame: 0x0, count: -5