panic: pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806d64ae00+16 0x0!=0x3a31d06105318fa1 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 91057 14578 0 0x2 0x4000080 0 syz-fuzzer *462132 50832 0 0x12 0 1 sshd db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8240acfd) at panic+0x164 sys/kern/subr_prf.c:218 pool_cache_get(ffffffff828ce6d0) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff828ce6d0) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff828ce6d0,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_copym(fffffd806a8de900,0,154,2) at m_copym+0x174 m_get sys/kern/uipc_mbuf.c:250 [inline] m_copym(fffffd806a8de900,0,154,2) at m_copym+0x174 sys/kern/uipc_mbuf.c:667 tcp_output(ffff800000adb4d0) at tcp_output+0x15ba sys/netinet/tcp_output.c:673 tcp_usrreq(fffffd806eaed7d8,9,fffffd806a8de900,0,0,ffff8000fffff8c0) at tcp_usrreq+0xa55 sosend(fffffd806eaed7d8,0,ffff800020e24758,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:555 dofilewritev(ffff8000fffff8c0,4,ffff800020e24758,0,ffff800020e24840) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff8000fffff8c0,ffff800020e247f0,ffff800020e24840) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e248c0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e248c0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffde710, count: 3 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_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806d64ae00+16 0x0!=0x3a31d06105318fa1 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8240acfd) at panic+0x164 sys/kern/subr_prf.c:218 pool_cache_get(ffffffff828ce6d0) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff828ce6d0) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff828ce6d0,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_copym(fffffd806a8de900,0,154,2) at m_copym+0x174 m_get sys/kern/uipc_mbuf.c:250 [inline] m_copym(fffffd806a8de900,0,154,2) at m_copym+0x174 sys/kern/uipc_mbuf.c:667 tcp_output(ffff800000adb4d0) at tcp_output+0x15ba sys/netinet/tcp_output.c:673 tcp_usrreq(fffffd806eaed7d8,9,fffffd806a8de900,0,0,ffff8000fffff8c0) at tcp_usrreq+0xa55 sosend(fffffd806eaed7d8,0,ffff800020e24758,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:555 dofilewritev(ffff8000fffff8c0,4,ffff800020e24758,0,ffff800020e24840) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff8000fffff8c0,ffff800020e247f0,ffff800020e24840) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e248c0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e248c0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffde710, count: -12 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020e240f0 rbx 0xffff800020e241a0 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffff800020e240b0 r9 0xffffffff814bc41f kprintf+0x16f r10 0x1 r11 0xe3dd89f53329dc6c r12 0x3000000008 r13 0xffff800020e24100 r14 0x100 r15 0x1 rip 0xffffffff81c991c8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020e240e0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (sshd) pid=462132 stat=onproc flags process=12 proc=0 pri=24, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffffe500,0xffff8000ffffe020 process=0xffff8000ffffcfc0 user=0xffff800020e1f000, vmspace=0xfffffd806e8fc738 estcpu=0, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 30683 231055 75776 0 2 0 syz-executor.1 69667 385532 0 0 3 0x14200 bored sosplice 5229 42978 0 0 3 0x14200 acct acct 75776 8424 14578 0 3 0x82 nanosleep syz-executor.1 68492 78945 14578 0 2 0x2 syz-executor.0 14578 210360 90847 0 3 0x82 thrsleep syz-fuzzer 14578 285959 90847 0 3 0x4000082 nanosleep syz-fuzzer 14578 125345 90847 0 3 0x4000082 thrsleep syz-fuzzer 14578 365006 90847 0 3 0x4000082 thrsleep syz-fuzzer 14578 91057 90847 0 7 0x4000082 syz-fuzzer 14578 226663 90847 0 3 0x4000082 thrsleep syz-fuzzer 14578 268187 90847 0 3 0x4000082 thrsleep syz-fuzzer 14578 114921 90847 0 3 0x4000082 nanosleep syz-fuzzer 90847 230249 50832 0 3 0x10008a pause ksh *50832 462132 31761 0 7 0x12 sshd 93514 147173 1 0 3 0x100083 ttyin getty 31761 504979 1 0 3 0x80 select sshd 85825 341938 40829 74 3 0x100092 bpf pflogd 40829 296056 1 0 3 0x80 netio pflogd 80441 302592 92153 73 3 0x100090 kqread syslogd 92153 218377 1 0 3 0x100082 netio syslogd 12726 295221 1 77 3 0x100090 poll dhclient 28600 210764 1 0 3 0x80 poll dhclient 70302 127630 0 0 3 0x14200 bored smr 34139 410189 0 0 2 0x14200 zerothread 31025 179294 0 0 3 0x14200 aiodoned aiodoned 49684 504552 0 0 3 0x14200 syncer update 16601 412891 0 0 3 0x14200 cleaner cleaner 50067 262438 0 0 3 0x14200 reaper reaper 87397 465731 0 0 3 0x14200 pgdaemon pagedaemon 6119 461867 0 0 3 0x14200 bored crynlk 38401 500547 0 0 3 0x14200 bored crypto 72368 174890 0 0 3 0x40014200 acpi0 acpi0 59692 2233 0 0 3 0x40014200 idle1 6453 34830 0 0 3 0x14200 bored softnet 70053 340322 0 0 3 0x14200 bored systqmp 4918 18082 0 0 3 0x14200 bored systq 7275 165715 0 0 3 0x40014200 bored softclock 98668 352372 0 0 3 0x40014200 idle0 1 410530 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 68492 (syz-executor.0) thread 0xffff800020dd6770 (78945) exclusive rwlock fdlock r = 0 (0xfffffd806ed17068) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 doopenat+0x611 sys/kern/vfs_syscalls.c:1210 #2 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #2 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #3 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828dd3d0) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 syscall+0x400 mi_syscall sys/sys/syscall_mi.h:93 [inline] #1 syscall+0x400 sys/arch/amd64/amd64/trap.c:570 #2 Xsyscall+0x128 Process 50832 (sshd) thread 0xffff8000fffff8c0 (462132) exclusive rwlock netlock r = 0 (0xffffffff827a6120) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 solock+0x5a sys/kern/uipc_socket2.c:282 #2 sosend+0x559 sys/kern/uipc_socket.c:543 #3 dofilewritev+0x1b6 sys/kern/sys_generic.c:365 #4 sys_write+0x83 sys/kern/sys_generic.c:285 #5 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #5 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #6 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9489 6411K 7171K 78643K 10797 0 pcb 13 8K 8K 78643K 57 0 rtable 107 3K 3K 78643K 223 0 ifaddr 53 11K 12K 78643K 72 0 counters 43 33K 34K 78643K 47 0 ioctlops 0 0K 4K 78643K 1487 0 iov 0 0K 12K 78643K 54 0 mount 1 1K 1K 78643K 1 0 vnodes 1224 77K 77K 78643K 1310 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 6 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 46 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 5 13K 25K 78643K 174 0 proc 60 63K 95K 78643K 439 0 subproc 32 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 9 0 in_multi 33 2K 2K 78643K 54 0 ether_multi 1 0K 0K 78643K 7 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 61 281K 281K 78643K 61 0 exec 0 0K 1K 78643K 212 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 166 27K 28K 78643K 1536 0 UVM aobj 15 6K 6K 78643K 16 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 49 0 NDP 8 0K 0K 78643K 16 0 temp 84 3866K 3930K 78643K 3736 0 kqueue 3 4K 8K 78643K 16 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 6 0 0 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 88 27 0 25 1 0 1 1 0 8 0 rtentry 112 48 0 3 2 0 2 2 0 8 0 unpcb 120 81 0 71 1 0 1 1 0 8 0 syncache 272 6 0 6 2 2 0 1 0 8 0 tcpqe 32 762 0 762 2 2 0 1 0 8 0 tcpcb 592 76 0 64 2 0 2 2 0 8 1 inpcb 296 210 0 203 3 1 2 2 0 8 1 nd6 48 9 0 2 1 0 1 1 0 8 0 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 23 0 8 1 0 1 1 0 8 0 pfstkey 112 23 0 8 1 0 1 1 0 8 0 pfstate 328 23 0 8 2 0 2 2 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 256 190 0 0 12 0 12 12 0 8 0 art_table 32 191 0 0 2 0 2 2 0 8 0 art_node 16 47 0 6 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 1 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 44 0 34 1 0 1 1 0 8 0 shmpl 112 13 0 1 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1634 0 229 88 0 88 88 0 8 0 ffsino 272 1634 0 229 94 0 94 94 0 8 0 nchpl 144 2076 0 470 60 0 60 60 0 8 0 uvmvnodes 72 1723 0 0 32 0 32 32 0 8 0 vnodes 208 1723 0 0 91 0 91 91 0 8 0 namei 1024 5901 0 5901 2 1 1 1 0 8 1 percpumem 16 34 0 2 1 0 1 1 0 8 0 scxspl 200 6148 0 6148 9 8 1 7 0 8 1 plimitpl 152 26 0 18 1 0 1 1 0 8 0 sigapl 424 391 0 358 4 0 4 4 0 8 0 futexpl 56 2283 0 2283 2 1 1 1 0 8 1 knotepl 112 75 0 55 1 0 1 1 0 8 0 kqueuepl 152 23 0 21 1 0 1 1 0 8 0 pipepl 304 99 0 88 5 3 2 2 0 8 1 fdescpl 496 374 0 358 3 0 3 3 0 8 0 filepl 152 2329 0 2227 5 0 5 5 0 8 0 lockfpl 104 282 0 281 1 0 1 1 0 8 0 lockfspl 48 98 0 97 1 0 1 1 0 8 0 sessionpl 120 18 0 7 1 0 1 1 0 8 0 pgrppl 48 20 0 9 1 0 1 1 0 8 0 ucredpl 96 459 0 450 1 0 1 1 0 8 0 zombiepl 144 358 0 358 2 1 1 1 0 8 1 processpl 1008 391 0 358 6 1 5 5 0 8 0 procpl 632 719 0 679 4 0 4 4 0 8 0 sockpl 400 318 0 299 6 2 4 4 0 8 2 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 273 0 0 34 0 34 34 0 8 0 mtagpl 96 21 0 0 1 0 1 1 0 8 0 mbufpl 256 279 0 0 17 0 17 17 0 8 0 bufpl 280 3711 0 127 256 0 256 256 0 8 0 anonpl 16 50975 0 33505 72 1 71 71 0 124 0 amapchunkpl 152 2028 0 1728 15 2 13 15 0 158 0 amappl16 192 1375 0 590 42 2 40 41 0 8 0 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 3 0 2 1 0 1 1 0 8 0 amappl13 168 171 0 164 1 0 1 1 0 8 0 amappl12 160 169 0 160 1 0 1 1 0 8 0 amappl11 152 57 0 42 1 0 1 1 0 8 0 amappl10 144 24 0 19 1 0 1 1 0 8 0 amappl9 136 371 0 369 1 0 1 1 0 8 0 amappl8 128 388 0 328 3 0 3 3 0 8 0 amappl7 120 117 0 105 1 0 1 1 0 8 0 amappl6 112 30 0 25 1 0 1 1 0 8 0 amappl5 104 196 0 179 1 0 1 1 0 8 0 amappl4 96 566 0 537 1 0 1 1 0 8 0 amappl3 88 201 0 191 1 0 1 1 0 8 0 amappl2 80 2073 0 2009 2 0 2 2 0 8 0 amappl1 72 19597 0 19169 23 12 11 18 0 8 0 amappl 80 1012 0 930 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 15 0 1 1 0 1 1 0 8 0 uaddrrnd 24 374 0 358 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 374 0 358 1 0 1 1 0 8 0 vmmpekpl 168 6984 0 6952 2 0 2 2 0 8 0 vmmpepl 168 54043 0 52065 125 30 95 113 0 357 5 vmsppl 368 373 0 358 2 0 2 2 0 8 0 pdppl 4096 755 0 716 6 0 6 6 0 8 0 pvpl 32 172563 0 151973 182 10 172 173 0 265 4 pmappl 232 373 0 358 2 1 1 2 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 275 0 8 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff827b4ff0) 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(ffffffff828dd1c8) at __mp_lock+0x127 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828dd1c8) at __mp_lock+0x127 sys/kern/kern_lock.c:147 __mp_acquire_count(ffffffff828dd1c8,2) 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(ffff800020e91ec0,1) at sleep_finish+0x113 sys/kern/kern_synch.c:418 sleep_finish_all(ffff800020e91ec0,1) at sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:447 [inline] sleep_finish_all(ffff800020e91ec0,1) at sleep_finish_all+0x32 sys/kern/kern_synch.c:393 tsleep(fffffd806e8d7be0,118,ffffffff8246f490,f9) at tsleep+0x1cc sys/kern/kern_synch.c:155 kqueue_sleep(fffffd806e8d7be0,ffff800020e92350) at kqueue_sleep+0x101 sys/kern/kern_event.c:885 kqueue_scan(fffffd806e8d7be0,40,c00004b638,ffff800020e92350,ffff800020dd6280,ffff800020e9239c) at kqueue_scan+0x2b6 sys/kern/kern_event.c:928 sys_kevent(ffff800020dd6280,ffff800020e92410,ffff800020e92460) at sys_kevent+0x464 sys/kern/kern_event.c:640 syscall(ffff800020e924e0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e924e0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc00004be38, count: 1 ddb{0}> trace x86_ipi_db(ffffffff827b4ff0) 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(ffffffff828dd1c8) at __mp_lock+0x127 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828dd1c8) at __mp_lock+0x127 sys/kern/kern_lock.c:147 __mp_acquire_count(ffffffff828dd1c8,2) 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(ffff800020e91ec0,1) at sleep_finish+0x113 sys/kern/kern_synch.c:418 sleep_finish_all(ffff800020e91ec0,1) at sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:447 [inline] sleep_finish_all(ffff800020e91ec0,1) at sleep_finish_all+0x32 sys/kern/kern_synch.c:393 tsleep(fffffd806e8d7be0,118,ffffffff8246f490,f9) at tsleep+0x1cc sys/kern/kern_synch.c:155 kqueue_sleep(fffffd806e8d7be0,ffff800020e92350) at kqueue_sleep+0x101 sys/kern/kern_event.c:885 kqueue_scan(fffffd806e8d7be0,40,c00004b638,ffff800020e92350,ffff800020dd6280,ffff800020e9239c) at kqueue_scan+0x2b6 sys/kern/kern_event.c:928 sys_kevent(ffff800020dd6280,ffff800020e92410,ffff800020e92460) at sys_kevent+0x464 sys/kern/kern_event.c:640 syscall(ffff800020e924e0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e924e0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc00004be38, count: -14 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(ffffffff8240acfd) at panic+0x164 sys/kern/subr_prf.c:218 pool_cache_get(ffffffff828ce6d0) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff828ce6d0) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff828ce6d0,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_copym(fffffd806a8de900,0,154,2) at m_copym+0x174 m_get sys/kern/uipc_mbuf.c:250 [inline] m_copym(fffffd806a8de900,0,154,2) at m_copym+0x174 sys/kern/uipc_mbuf.c:667 tcp_output(ffff800000adb4d0) at tcp_output+0x15ba sys/netinet/tcp_output.c:673 tcp_usrreq(fffffd806eaed7d8,9,fffffd806a8de900,0,0,ffff8000fffff8c0) at tcp_usrreq+0xa55 sosend(fffffd806eaed7d8,0,ffff800020e24758,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:555 dofilewritev(ffff8000fffff8c0,4,ffff800020e24758,0,ffff800020e24840) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff8000fffff8c0,ffff800020e247f0,ffff800020e24840) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e248c0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e248c0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffde710, count: 3 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8240acfd) at panic+0x164 sys/kern/subr_prf.c:218 pool_cache_get(ffffffff828ce6d0) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff828ce6d0) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff828ce6d0,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_copym(fffffd806a8de900,0,154,2) at m_copym+0x174 m_get sys/kern/uipc_mbuf.c:250 [inline] m_copym(fffffd806a8de900,0,154,2) at m_copym+0x174 sys/kern/uipc_mbuf.c:667 tcp_output(ffff800000adb4d0) at tcp_output+0x15ba sys/netinet/tcp_output.c:673 tcp_usrreq(fffffd806eaed7d8,9,fffffd806a8de900,0,0,ffff8000fffff8c0) at tcp_usrreq+0xa55 sosend(fffffd806eaed7d8,0,ffff800020e24758,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:555 dofilewritev(ffff8000fffff8c0,4,ffff800020e24758,0,ffff800020e24840) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff8000fffff8c0,ffff800020e247f0,ffff800020e24840) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e248c0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e248c0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffde710, count: -12