panic: pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806b785200+16 0x0!=0x64b1f212dc286732 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 480270 63820 0 0x2 0 0 syz-executor.0 *313872 93965 0 0x12 0 1 sshd db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8240e744) at panic+0x164 sys/kern/subr_prf.c:218 pool_cache_get(ffffffff828d47c8) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff828d47c8) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff828d47c8,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_gethdr(2,2) at m_gethdr+0x4c sys/kern/uipc_mbuf.c:283 tcp_output(ffff800000adb030) at tcp_output+0x14e6 tcp_usrreq(fffffd806eae87d8,9,fffffd80642b1600,0,0,ffff8000ffffe778) at tcp_usrreq+0xa55 sosend(fffffd806eae87d8,0,ffff800020e44518,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:555 dofilewritev(ffff8000ffffe778,4,ffff800020e44518,0,ffff800020e44600) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff8000ffffe778,ffff800020e445b0,ffff800020e44600) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e44680) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e44680) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd4fc0, 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 0xfffffd806b785200+16 0x0!=0x64b1f212dc286732 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8240e744) at panic+0x164 sys/kern/subr_prf.c:218 pool_cache_get(ffffffff828d47c8) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff828d47c8) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff828d47c8,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_gethdr(2,2) at m_gethdr+0x4c sys/kern/uipc_mbuf.c:283 tcp_output(ffff800000adb030) at tcp_output+0x14e6 tcp_usrreq(fffffd806eae87d8,9,fffffd80642b1600,0,0,ffff8000ffffe778) at tcp_usrreq+0xa55 sosend(fffffd806eae87d8,0,ffff800020e44518,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:555 dofilewritev(ffff8000ffffe778,4,ffff800020e44518,0,ffff800020e44600) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff8000ffffe778,ffff800020e445b0,ffff800020e44600) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e44680) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e44680) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd4fc0, count: -12 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020e43f10 rbx 0xffff800020e43fc0 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffff800020e43ed0 r9 0xffffffff8167b47f kprintf+0x16f r10 0x1 r11 0x65d77cd71a6a37b9 r12 0x3000000008 r13 0xffff800020e43f20 r14 0x100 r15 0x1 rip 0xffffffff8215e708 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020e43f00 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (sshd) pid=313872 stat=onproc flags process=12 proc=0 pri=50, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffff8c0,0xffff8000ffffea00 process=0xffff8000ffffc7e0 user=0xffff800020e3f000, vmspace=0xfffffd806e8f32e8 estcpu=0, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 89775 180620 47463 0 3 0x82 nanosleep syz-executor.1 63820 480270 47463 0 7 0x2 syz-executor.0 26798 460521 1 0 3 0x100083 ttyin getty 76866 5107 0 0 3 0x14200 bored sosplice 47463 311820 36508 0 3 0x82 thrsleep syz-fuzzer 47463 76573 36508 0 3 0x4000082 nanosleep syz-fuzzer 47463 487921 36508 0 3 0x4000082 thrsleep syz-fuzzer 47463 312440 36508 0 3 0x4000082 thrsleep syz-fuzzer 47463 437864 36508 0 3 0x4000082 thrsleep syz-fuzzer 47463 346822 36508 0 3 0x4000082 thrsleep syz-fuzzer 47463 52103 36508 0 3 0x4000082 kqread syz-fuzzer 47463 485987 36508 0 3 0x4000082 thrsleep syz-fuzzer 36508 234245 93965 0 3 0x10008a pause ksh *93965 313872 94407 0 7 0x12 sshd 94407 53059 1 0 3 0x80 select sshd 56639 299615 43068 74 3 0x100092 bpf pflogd 43068 511931 1 0 3 0x80 netio pflogd 9946 346962 54132 73 3 0x100090 kqread syslogd 54132 244693 1 0 3 0x100082 netio syslogd 2593 364511 1 77 3 0x100090 poll dhclient 31432 219685 1 0 3 0x80 poll dhclient 93073 474273 0 0 3 0x14200 bored smr 92342 10826 0 0 3 0x14200 pgzero zerothread 11138 276115 0 0 3 0x14200 aiodoned aiodoned 81535 501787 0 0 3 0x14200 syncer update 37552 99515 0 0 3 0x14200 cleaner cleaner 64576 403243 0 0 3 0x14200 reaper reaper 52945 411645 0 0 3 0x14200 pgdaemon pagedaemon 84065 14393 0 0 3 0x14200 bored crynlk 32580 238935 0 0 3 0x14200 bored crypto 88109 512066 0 0 3 0x40014200 acpi0 acpi0 16765 245412 0 0 3 0x40014200 idle1 72838 91761 0 0 3 0x14200 bored softnet 21886 14432 0 0 3 0x14200 bored systqmp 31133 336690 0 0 3 0x14200 bored systq 5770 269570 0 0 3 0x40014200 bored softclock 40003 220429 0 0 3 0x40014200 idle0 1 119954 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 63820 (syz-executor.0) thread 0xffff800020eb58c8 (480270) exclusive rrwlock inode r = 0 (0xfffffd806c7fd3c8) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 rw_enter+0x453 sys/kern/kern_rwlock.c:311 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:462 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:603 #4 vn_lock+0x81 sys/kern/vfs_vnops.c:575 #5 uvm_vnp_uncache+0xe6 sys/uvm/uvm_vnode.c:1341 #6 dounlinkat+0x17b sys/kern/vfs_syscalls.c:1889 #7 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #7 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #8 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806c7fde68) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 rw_enter+0x453 sys/kern/kern_rwlock.c:311 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:462 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:603 #4 vn_lock+0x81 sys/kern/vfs_vnops.c:575 #5 vget+0x1c8 sys/kern/vfs_subr.c:671 #6 cache_lookup+0x2bb sys/kern/vfs_cache.c:224 #7 ufs_lookup+0x1bc sys/ufs/ufs/ufs_lookup.c:162 #8 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:90 #9 vfs_lookup+0x7a6 sys/kern/vfs_lookup.c:568 #10 namei+0x63c sys/kern/vfs_lookup.c:249 #11 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1853 #12 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #12 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #13 Xsyscall+0x128 Process 93965 (sshd) thread 0xffff8000ffffe778 (313872) exclusive rwlock netlock r = 0 (0xffffffff82780fa0) #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 9516 6556K 6801K 78643K 11179 0 pcb 13 8K 8K 78643K 109 0 rtable 101 12K 15K 78643K 488 0 ifaddr 67 13K 13K 78643K 164 0 counters 45 34K 34K 78643K 69 0 ioctlops 0 0K 4K 78643K 1634 0 iov 0 0K 16K 78643K 58 0 mount 1 1K 1K 78643K 1 0 vnodes 1216 76K 77K 78643K 1463 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 14 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 143 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 5 13K 25K 78643K 683 0 sigio 0 0K 0K 78643K 8 0 proc 61 63K 95K 78643K 558 0 subproc 32 2K 2K 78643K 68 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 51 0 in_multi 45 2K 3K 78643K 162 0 ether_multi 1 0K 0K 78643K 11 0 mrt 0 0K 0K 78643K 3 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 49 228K 228K 78643K 49 0 exec 0 0K 1K 78643K 260 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 164 90K 106K 78643K 3126 0 UVM aobj 44 2K 2K 78643K 47 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 66 0 NDP 11 0K 0K 78643K 44 0 temp 109 3865K 3933K 78643K 11660 0 kqueue 3 4K 10K 78643K 17 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 12 0 6 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 88 51 0 49 1 0 1 1 0 8 0 rtentry 112 102 0 63 2 0 2 2 0 8 0 unpcb 120 336 0 326 1 0 1 1 0 8 0 syncache 272 7 0 7 2 2 0 1 0 8 0 tcpqe 32 25 0 25 1 1 0 1 0 8 0 tcpcb 592 175 0 169 3 1 2 2 0 8 1 inpcb 296 646 0 639 3 1 2 2 0 8 1 nd6 48 30 0 25 1 0 1 1 0 8 0 ppxss 1136 1 0 1 1 0 1 1 0 8 1 pffrag 232 4 0 3 2 1 1 1 0 482 0 pffrnode 88 4 0 3 2 1 1 1 0 8 0 pffrent 40 137 0 136 2 1 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 pfrktable 1344 10 0 10 1 1 0 1 0 8 0 pfstitem 24 13 0 5 1 0 1 1 0 8 0 pfstkey 112 13 0 5 1 0 1 1 0 8 0 pfstate 328 13 0 5 2 0 2 2 0 8 0 pfrule 1360 23 0 22 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 318 0 145 14 2 12 13 0 8 0 art_table 32 319 0 145 2 0 2 2 0 8 0 art_node 16 101 0 66 1 0 1 1 0 8 0 sysvmsgpl 40 22 0 11 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 135 0 125 1 0 1 1 0 8 0 shmpl 112 44 0 3 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2490 0 1091 89 1 88 89 0 8 0 ffsino 272 2490 0 1091 94 0 94 94 0 8 0 nchpl 144 3768 0 2168 60 0 60 60 0 8 0 uvmvnodes 72 2699 0 0 50 0 50 50 0 8 0 vnodes 208 2699 0 0 143 0 143 143 0 8 0 namei 1024 10881 0 10881 1 0 1 1 0 8 1 percpumem 16 45 0 12 1 0 1 1 0 8 0 vcpupl 1984 6 0 0 1 0 1 1 0 8 0 vmpool 560 11 0 5 1 0 1 1 0 8 0 pfiaddrpl 120 3 0 3 1 1 0 1 0 8 0 scxspl 200 10689 0 10689 9 8 1 7 0 8 1 plimitpl 152 37 0 29 1 0 1 1 0 8 0 sigapl 424 894 0 862 4 0 4 4 0 8 0 futexpl 56 9186 0 9186 1 0 1 1 0 8 1 knotepl 112 104 0 84 1 0 1 1 0 8 0 kqueuepl 152 74 0 67 1 0 1 1 0 8 0 pipepl 304 158 0 147 3 1 2 2 0 8 0 fdescpl 496 878 0 862 3 0 3 3 0 8 0 filepl 152 5424 0 5315 5 0 5 5 0 8 0 lockfpl 104 120 0 119 1 0 1 1 0 8 0 lockfspl 48 45 0 44 1 0 1 1 0 8 0 sessionpl 120 21 0 10 1 0 1 1 0 8 0 pgrppl 48 21 0 10 1 0 1 1 0 8 0 ucredpl 96 522 0 513 1 0 1 1 0 8 0 zombiepl 144 863 0 862 1 0 1 1 0 8 0 processpl 1008 894 0 862 5 0 5 5 0 8 0 procpl 632 2193 0 2154 4 0 4 4 0 8 0 sosppl 144 3 0 3 2 1 1 1 0 8 1 sockpl 400 1033 0 1014 4 0 4 4 0 8 2 mcl64k 65536 8 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 9 0 0 1 0 1 1 0 8 0 mcl9k 9216 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 7 0 0 1 0 1 1 0 8 0 mcl4k 4096 13 0 0 2 0 2 2 0 8 0 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 198 0 0 24 0 24 24 0 8 0 mtagpl 96 19 0 0 1 0 1 1 0 8 0 mbufpl 256 355 0 0 21 0 21 21 0 8 0 bufpl 280 4512 0 127 314 0 314 314 0 8 0 anonpl 16 92676 0 74811 75 2 73 74 0 124 0 amapchunkpl 152 4723 0 4476 12 0 12 12 0 158 0 amappl16 192 3501 0 2615 46 0 46 46 0 8 1 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 155 0 153 1 0 1 1 0 8 0 amappl13 168 210 0 205 1 0 1 1 0 8 0 amappl12 160 340 0 336 1 0 1 1 0 8 0 amappl11 152 69 0 54 1 0 1 1 0 8 0 amappl10 144 171 0 165 1 0 1 1 0 8 0 amappl9 136 370 0 369 1 0 1 1 0 8 0 amappl8 128 388 0 345 2 0 2 2 0 8 0 amappl7 120 280 0 267 1 0 1 1 0 8 0 amappl6 112 35 0 28 1 0 1 1 0 8 0 amappl5 104 789 0 772 1 0 1 1 0 8 0 amappl4 96 687 0 658 1 0 1 1 0 8 0 amappl3 88 460 0 450 1 0 1 1 0 8 0 amappl2 80 5965 0 5896 2 0 2 2 0 8 0 amappl1 72 34254 0 33799 23 13 10 18 0 8 0 amappl 80 2518 0 2445 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 46 0 3 1 0 1 1 0 8 0 uaddrrnd 24 889 0 867 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 889 0 867 1 0 1 1 0 8 0 vmmpekpl 168 10202 0 10166 2 0 2 2 0 8 0 vmmpepl 168 120291 0 118189 148 32 116 125 0 357 19 vmsppl 368 888 0 867 4 1 3 3 0 8 1 pdppl 4096 1785 0 1740 8 1 7 7 0 8 1 pvpl 32 302578 0 281528 183 6 177 180 0 265 2 pmappl 232 888 0 867 3 1 2 2 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 274 0 10 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff82738ff0) 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(ffffffff8293cd60) at __mp_lock+0x127 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff8293cd60) at __mp_lock+0x127 sys/kern/kern_lock.c:147 __mp_acquire_count(ffffffff8293cd60,1) 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(ffff800020ece510,1) at sleep_finish+0x113 sys/kern/kern_synch.c:418 sleep_finish_all(ffff800020ece510,1) at sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:447 [inline] sleep_finish_all(ffff800020ece510,1) at sleep_finish_all+0x32 sys/kern/kern_synch.c:393 tsleep(fffffd8078c3a8f8,11,ffffffff8247e1f1,0) at tsleep+0x1cc sys/kern/kern_synch.c:155 biowait(fffffd8078c3a8f8) at biowait+0xa6 sys/kern/vfs_bio.c:1262 bwrite(fffffd8078c3a8f8) at bwrite+0x215 sys/kern/vfs_bio.c:771 ufs_dirremove(fffffd8063fc8ea8,fffffd806c7fd330,800c,0) at ufs_dirremove+0x291 ufs_remove(ffff800020ece728) at ufs_remove+0x154 sys/ufs/ufs/ufs_vnops.c:611 VOP_REMOVE(fffffd8063fc8ea8,fffffd8067a94eb0,ffff800020ece828) at VOP_REMOVE+0x11f sys/kern/vfs_vops.c:379 end trace frame: 0xffff800020ece8c0, count: 0 ddb{0}> trace x86_ipi_db(ffffffff82738ff0) 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(ffffffff8293cd60) at __mp_lock+0x127 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff8293cd60) at __mp_lock+0x127 sys/kern/kern_lock.c:147 __mp_acquire_count(ffffffff8293cd60,1) 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(ffff800020ece510,1) at sleep_finish+0x113 sys/kern/kern_synch.c:418 sleep_finish_all(ffff800020ece510,1) at sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:447 [inline] sleep_finish_all(ffff800020ece510,1) at sleep_finish_all+0x32 sys/kern/kern_synch.c:393 tsleep(fffffd8078c3a8f8,11,ffffffff8247e1f1,0) at tsleep+0x1cc sys/kern/kern_synch.c:155 biowait(fffffd8078c3a8f8) at biowait+0xa6 sys/kern/vfs_bio.c:1262 bwrite(fffffd8078c3a8f8) at bwrite+0x215 sys/kern/vfs_bio.c:771 ufs_dirremove(fffffd8063fc8ea8,fffffd806c7fd330,800c,0) at ufs_dirremove+0x291 ufs_remove(ffff800020ece728) at ufs_remove+0x154 sys/ufs/ufs/ufs_vnops.c:611 VOP_REMOVE(fffffd8063fc8ea8,fffffd8067a94eb0,ffff800020ece828) at VOP_REMOVE+0x11f sys/kern/vfs_vops.c:379 dounlinkat(ffff800020eb58c8,ffffff9c,7f7ffffdd3b0,0) at dounlinkat+0x195 sys/kern/vfs_syscalls.c:1889 syscall(ffff800020ece9a0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020ece9a0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffdd860, count: -17 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(ffffffff8240e744) at panic+0x164 sys/kern/subr_prf.c:218 pool_cache_get(ffffffff828d47c8) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff828d47c8) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff828d47c8,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_gethdr(2,2) at m_gethdr+0x4c sys/kern/uipc_mbuf.c:283 tcp_output(ffff800000adb030) at tcp_output+0x14e6 tcp_usrreq(fffffd806eae87d8,9,fffffd80642b1600,0,0,ffff8000ffffe778) at tcp_usrreq+0xa55 sosend(fffffd806eae87d8,0,ffff800020e44518,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:555 dofilewritev(ffff8000ffffe778,4,ffff800020e44518,0,ffff800020e44600) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff8000ffffe778,ffff800020e445b0,ffff800020e44600) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e44680) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e44680) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd4fc0, count: 3 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8240e744) at panic+0x164 sys/kern/subr_prf.c:218 pool_cache_get(ffffffff828d47c8) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff828d47c8) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff828d47c8,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_gethdr(2,2) at m_gethdr+0x4c sys/kern/uipc_mbuf.c:283 tcp_output(ffff800000adb030) at tcp_output+0x14e6 tcp_usrreq(fffffd806eae87d8,9,fffffd80642b1600,0,0,ffff8000ffffe778) at tcp_usrreq+0xa55 sosend(fffffd806eae87d8,0,ffff800020e44518,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:555 dofilewritev(ffff8000ffffe778,4,ffff800020e44518,0,ffff800020e44600) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff8000ffffe778,ffff800020e445b0,ffff800020e44600) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e44680) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e44680) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd4fc0, count: -12