panic: kernel diagnostic assertion "len >= 0 && !M_READONLY(m)" failed: file "/syzkaller/managers/main/kernel/sys/kern/uipc_mbuf.c", line 1384 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *440667 12612 0 0 0x4000000 0 syz-executor.4 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff82547276) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff825bae63,ffffffff825cabcb,568,ffffffff8255b781) at __assert+0x25 sys/kern/subr_prf.c:161 m_align(fffffd8068864400,ffffffd9) at m_align+0x1a0 sys/kern/uipc_mbuf.c:1385 bpf_movein(ffff80002e795920,ffff800000bf1a00,ffff80002e795688,ffff80002e795588) at bpf_movein+0x25e sys/net/bpf.c:228 bpfwrite(41700,ffff80002e795920,1) at bpfwrite+0x128 sys/net/bpf.c:644 spec_write(ffff80002e795780) at spec_write+0xcb sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd807e8be3d0,ffff80002e795920,1,fffffd807f7d8600) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd806a3f93d0,ffff80002e795920,1) at vn_write+0x19c sys/kern/vfs_vnops.c:414 dofilewritev(ffff80002653c7e8,3,ffff80002e795920,1,ffff80002e795a20) at dofilewritev+0x19c sys/kern/sys_generic.c:381 sys_pad_pwrite(ffff80002653c7e8,ffff80002e7959c8,ffff80002e795a20) at sys_pad_pwrite+0x92 sys_pwrite sys/kern/vfs_syscalls.c:3354 [inline] sys_pad_pwrite(ffff80002653c7e8,ffff80002e7959c8,ffff80002e795a20) at sys_pad_pwrite+0x92 sys/kern/vfs_syscalls.c:3426 syscall(ffff80002e795a90) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8d3ad245760, count: 2 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: kernel diagnostic assertion "len >= 0 && !M_READONLY(m)" failed: file "/syzkaller/managers/main/kernel/sys/kern/uipc_mbuf.c", line 1384 ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff82547276) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff825bae63,ffffffff825cabcb,568,ffffffff8255b781) at __assert+0x25 sys/kern/subr_prf.c:161 m_align(fffffd8068864400,ffffffd9) at m_align+0x1a0 sys/kern/uipc_mbuf.c:1385 bpf_movein(ffff80002e795920,ffff800000bf1a00,ffff80002e795688,ffff80002e795588) at bpf_movein+0x25e sys/net/bpf.c:228 bpfwrite(41700,ffff80002e795920,1) at bpfwrite+0x128 sys/net/bpf.c:644 spec_write(ffff80002e795780) at spec_write+0xcb sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd807e8be3d0,ffff80002e795920,1,fffffd807f7d8600) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd806a3f93d0,ffff80002e795920,1) at vn_write+0x19c sys/kern/vfs_vnops.c:414 dofilewritev(ffff80002653c7e8,3,ffff80002e795920,1,ffff80002e795a20) at dofilewritev+0x19c sys/kern/sys_generic.c:381 sys_pad_pwrite(ffff80002653c7e8,ffff80002e7959c8,ffff80002e795a20) at sys_pad_pwrite+0x92 sys_pwrite sys/kern/vfs_syscalls.c:3354 [inline] sys_pad_pwrite(ffff80002653c7e8,ffff80002e7959c8,ffff80002e795a20) at sys_pad_pwrite+0x92 sys/kern/vfs_syscalls.c:3426 syscall(ffff80002e795a90) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8d3ad245760, count: -13 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002e7953b0 rbx 0x20 rdx 0xffff800000d242c0 rcx 0 rax 0xffff80002653c7e8 r8 0 r9 0x8080808080808080 r10 0x3ae0f4d53252cf91 r11 0x21f82d9d446c2ae2 r12 0 r13 0xffffffd9 r14 0 r15 0x1 rip 0xffffffff81e942b8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e7953a0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.4) pid=440667 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=58, nice=20 forw=0xffffffffffffffff, list=0xffff80002653c008,0xffff8000216b97c0 process=0xffff800021627790 user=0xffff80002e790000, vmspace=0xfffffd8072fa2bb8 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 56960 61864 74847 0 3 0x80 nanoslp syz-executor.2 56960 208178 74847 0 3 0x4000080 fsleep syz-executor.2 15575 220776 61757 0 2 0 syz-executor.5 15575 503628 61757 0 3 0x4000080 fsleep syz-executor.5 86363 349051 83608 0 2 0 syz-executor.1 86363 468798 83608 0 3 0x4000080 fsleep syz-executor.1 28874 339080 37866 0 2 0 syz-executor.0 28874 467752 37866 0 3 0x4000080 fsleep syz-executor.0 12612 460864 14894 0 2 0 syz-executor.4 *12612 440667 14894 0 7 0x4000000 syz-executor.4 62065 73238 50223 0 2 0 syz-executor.3 14894 296845 58232 0 3 0x82 nanoslp syz-executor.4 83608 210597 58232 0 3 0x82 nanoslp syz-executor.1 74847 159534 58232 0 2 0x482 syz-executor.2 61757 97190 58232 0 2 0x482 syz-executor.5 95782 63917 0 0 3 0x14280 nfsidl nfsio 79017 169328 0 0 3 0x14280 nfsidl nfsio 93537 50754 0 0 3 0x14280 nfsidl nfsio 48662 349138 0 0 3 0x14280 nfsidl nfsio 43482 239463 0 0 3 0x14280 nfsidl nfsio 40024 195842 0 0 3 0x14280 nfsidl nfsio 81795 428874 0 0 3 0x14280 nfsidl nfsio 76413 283371 0 0 3 0x14280 nfsidl nfsio 41054 312059 0 0 3 0x14280 nfsidl nfsio 12164 238236 0 0 3 0x14280 nfsidl nfsio 54789 125942 0 0 3 0x14280 nfsidl nfsio 36886 239942 0 0 3 0x14280 nfsidl nfsio 89661 509890 0 0 3 0x14280 nfsidl nfsio 19898 33794 0 0 3 0x14280 nfsidl nfsio 50223 494411 58232 0 2 0x482 syz-executor.3 40878 512210 58232 0 3 0x82 nanoslp syz-executor.6 58481 378711 58232 0 2 0x2 syz-executor.7 84982 280970 1 0 3 0x100083 ttyin getty 37866 425222 58232 0 2 0x482 syz-executor.0 33400 314668 0 0 3 0x14280 nfsidl nfsio 87882 427405 0 0 3 0x14280 nfsidl nfsio 24001 169551 0 0 3 0x14280 nfsidl nfsio 82500 197220 0 0 3 0x14280 nfsidl nfsio 21982 392895 0 0 3 0x14280 nfsidl nfsio 57834 151917 0 0 3 0x14280 nfsidl nfsio 37088 330529 0 0 3 0x14200 bored sosplice 58232 282262 3577 0 3 0x82 thrsleep syz-fuzzer 58232 252423 3577 0 2 0x4000002 syz-fuzzer 58232 189407 3577 0 3 0x4000082 thrsleep syz-fuzzer 58232 429301 3577 0 3 0x4000082 thrsleep syz-fuzzer 58232 196042 3577 0 3 0x4000082 kqread syz-fuzzer 58232 511357 3577 0 3 0x4000082 thrsleep syz-fuzzer 58232 407155 3577 0 3 0x4000082 thrsleep syz-fuzzer 58232 447139 3577 0 3 0x4000082 thrsleep syz-fuzzer 58232 162774 3577 0 3 0x4000082 thrsleep syz-fuzzer 3577 323083 45403 0 3 0x10008a sigsusp ksh 45403 90232 54460 0 3 0x9a kqread sshd 54460 336896 1 0 3 0x88 kqread sshd 20646 10399 36544 73 3 0x100090 kqread syslogd 36544 472685 1 0 3 0x100082 netio syslogd 5155 292212 1 0 3 0x100080 kqread resolvd 71019 188113 63092 77 3 0x100092 kqread dhcpleased 66594 408544 63092 77 3 0x100092 kqread dhcpleased 63092 418065 1 0 3 0x80 kqread dhcpleased 39477 479308 0 0 3 0x14200 bored smr 75799 363127 0 0 2 0x14200 zerothread 44405 506969 0 0 3 0x14200 aiodoned aiodoned 39352 251333 0 0 3 0x14200 syncer update 28344 491641 0 0 3 0x14200 cleaner cleaner 35456 14703 0 0 3 0x14200 reaper reaper 59886 340050 0 0 3 0x14200 pgdaemon pagedaemon 38629 202952 0 0 3 0x14200 bored viomb 93871 227582 0 0 3 0x40014200 acpi0 acpi0 79977 138084 0 0 3 0x14200 bored softnet 41284 250759 0 0 3 0x14200 bored systqmp 40993 116537 0 0 3 0x14200 bored systq 30093 516563 0 0 2 0x40014200 softclock 63800 408789 0 0 3 0x40014200 idle0 1 343343 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10215 6618K 7720K 78643K 43631 0 pcb 13 18K 20K 78643K 2873 0 rtable 260 27K 28K 78643K 5819 0 ifaddr 98 28K 30K 78643K 3024 0 sysctl 3 1K 1K 78643K 5 0 counters 26 17K 17K 78643K 341 0 ioctlops 0 0K 4K 78643K 5599 0 iov 0 0K 28K 78643K 2331 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1616 101K 101K 78643K 14214 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 241 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 1K 78643K 2404 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 16 57K 74K 78643K 21641 0 sigio 0 0K 0K 78643K 455 0 proc 70 55K 79K 78643K 4086 0 subproc 104 6K 10K 78643K 1523 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 1151 0 in_multi 88 5K 6K 78643K 1870 0 ether_multi 1 0K 0K 78643K 233 0 mrt 1 0K 0K 78643K 49 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 253 1129K 1129K 78643K 253 0 exec 0 0K 2K 78643K 6175 0 pfkey data 0 0K 0K 78643K 38 0 tdb 3 0K 0K 78643K 3 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 646 1566K 1863K 78643K 260535 0 UVM aobj 131 8K 8K 78643K 142 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 1118 0 NDP 12 0K 1K 78643K 569 0 temp 145 4727K 4807K 78643K 206405 0 kqueue 13 20K 28K 78643K 1465 0 SYN cache 2 16K 16K 78643K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 1538 0 1535 19 18 1 5 0 8 0 rtentry 112 1453 0 1363 4 1 3 4 0 8 0 unpcb 136 19023 0 19010 198 197 1 9 0 8 0 syncache 296 15 0 15 6 6 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 5 0 5 2 2 0 1 0 8 0 tcpcb 736 13307 0 13255 373 368 5 23 0 8 0 arp 88 238 0 221 1 0 1 1 0 8 0 ipq 40 96 0 96 12 12 0 1 0 8 0 ipqe 40 3499 0 3499 12 12 0 1 0 8 0 inpcb 304 40452 0 40438 373 371 2 17 0 8 0 rttmr 72 3 0 3 1 1 0 1 0 8 0 ip6q 72 45 0 45 4 4 0 1 0 8 0 ip6af 40 85 0 85 5 5 0 1 0 8 0 nd6 48 381 0 359 1 0 1 1 0 8 0 pkpcb 40 259 0 259 16 16 0 1 0 8 0 kcovpl 48 112 0 104 1 0 1 1 0 8 0 ppxss 1152 92 0 92 18 18 0 1 0 8 0 pfstscr 40 81 0 81 5 5 0 1 0 8 0 pffrag 232 1 0 1 1 1 0 1 0 482 0 pffrnode 88 1 0 1 1 1 0 1 0 8 0 pffrent 40 8 0 8 2 2 0 1 0 8 0 pfosfp 40 18 0 16 2 1 1 1 0 8 0 pfosfpen 112 18 0 16 2 1 1 1 0 8 0 pfrke_plain 168 18 0 18 2 2 0 1 0 8 0 pfrktable 1344 503 0 481 3 1 2 3 0 8 0 pftag 88 34 0 20 1 0 1 1 0 8 0 pfqueue 264 1 0 1 1 1 0 1 0 8 0 pfstitem 24 16 0 16 4 4 0 1 0 8 0 pfstkey 112 152 0 152 5 5 0 1 0 8 0 pfstate 320 76 0 76 5 5 0 1 0 8 0 pfrule 1360 1200 0 1028 24 9 15 15 0 8 0 art_heap8 4096 2 0 1 2 1 1 2 0 8 0 art_heap4 256 6460 0 6052 68 39 29 30 0 8 0 art_table 32 6462 0 6053 4 0 4 4 0 8 0 art_node 16 1415 0 1336 1 0 1 1 0 8 0 sysvmsgpl 40 43 0 3 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 2400 0 2390 1 0 1 1 0 8 0 shmpl 112 139 0 11 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 29584 0 28065 96 0 96 96 0 8 0 ffsino 240 29584 0 28065 90 0 90 90 0 8 0 nchpl 144 57795 0 56176 62 0 62 62 0 8 0 rtmask 32 28 0 28 2 2 0 1 0 8 0 uvmvnodes 80 6242 0 0 128 0 128 128 0 8 0 vnodes 224 6242 0 0 368 0 368 368 0 8 0 namei 1024 213257 0 213256 14 13 1 2 0 8 0 vcpupl 1984 272 0 0 34 0 34 34 0 8 0 vmpool 528 346 0 74 23 4 19 19 0 8 0 pfiaddrpl 120 253 0 202 2 0 2 2 0 8 0 scsiplug 72 13 0 13 4 4 0 1 0 8 0 scxspl 216 172968 0 172968 50 49 1 8 0 8 1 plimitpl 152 2514 0 2500 1 0 1 1 0 8 0 sigapl 424 21766 0 21705 9 1 8 8 0 8 0 futexpl 64 212186 0 212182 8 7 1 1 0 8 0 knotepl 120 195443 0 195362 54 50 4 10 0 8 0 kqueuepl 184 4908 0 4899 69 68 1 4 0 8 0 pipepl 304 5071 0 5043 125 122 3 12 0 8 0 fdescpl 432 21703 0 21676 4 0 4 4 0 8 0 filepl 120 169796 0 169554 273 265 8 18 0 8 0 lockfpl 104 5044 0 5041 10 9 1 2 0 8 0 lockfspl 48 1377 0 1374 1 0 1 1 0 8 0 sessionpl 144 132 0 116 1 0 1 1 0 8 0 pgrppl 48 208 0 192 1 0 1 1 0 8 0 ucredpl 96 20820 0 20805 1 0 1 1 0 8 0 zombiepl 144 21705 0 21704 6 5 1 1 0 8 0 processpl 1000 21766 0 21704 9 0 9 9 0 8 0 procpl 672 54196 0 54121 21 13 8 9 0 8 0 sosppl 168 178 0 178 34 34 0 1 0 8 0 sockpl 448 61506 0 61479 987 983 4 31 0 8 1 mcl64k 65536 889 0 889 55 55 0 1 0 8 0 mcl16k 16384 242 0 242 51 51 0 1 0 8 0 mcl12k 12288 690 0 690 62 62 0 1 0 8 0 mcl9k 9216 436 0 436 71 70 1 1 0 8 1 mcl8k 8192 1927 0 1927 47 47 0 1 0 8 0 mcl4k 4096 2179 0 2179 35 34 1 1 0 8 1 mcl2k2 2112 161 0 161 62 61 1 1 0 8 1 mcl2k 2048 122418 0 122363 81 73 8 22 0 8 0 mtagpl 96 4887 0 4769 29 25 4 12 0 8 0 mbufpl 256 370819 0 370478 1431 1401 30 564 0 8 0 bufpl 288 43458 0 37118 459 0 459 459 0 8 0 anonpl 24 6005038 0 5983995 344 206 138 153 0 188 0 amapchunkpl 152 751748 0 750924 1785 1725 60 665 0 158 25 amappl16 200 59786 0 58956 258 212 46 57 0 8 0 amappl15 192 6018 0 6010 1 0 1 1 0 8 0 amappl14 184 2879 0 2874 1 0 1 1 0 8 0 amappl13 176 3512 0 3511 1 0 1 1 0 8 0 amappl12 168 994 0 992 1 0 1 1 0 8 0 amappl11 160 2606 0 2592 1 0 1 1 0 8 0 amappl10 152 1129 0 1123 1 0 1 1 0 8 0 amappl9 144 2529 0 2525 1 0 1 1 0 8 0 amappl8 136 6196 0 6074 6 1 5 5 0 8 0 amappl7 128 3810 0 3799 1 0 1 1 0 8 0 amappl6 120 2624 0 2597 2 1 1 2 0 8 0 amappl5 112 18828 0 18809 1 0 1 1 0 8 0 amappl4 104 7835 0 7799 17 16 1 2 0 8 0 amappl3 96 3865 0 3854 1 0 1 1 0 8 0 amappl2 88 5878 0 5810 3 1 2 3 0 8 0 amappl1 80 383804 0 383252 18 5 13 18 0 8 0 amappl 88 257866 0 257527 13 4 9 9 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 72 141 0 11 3 0 3 3 0 8 0 uaddrrnd 24 22049 0 21750 2 0 2 2 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 22049 0 21750 2 0 2 2 0 8 0 vmmpekpl 168 151974 0 151892 5 0 5 5 0 8 0 vmmpepl 168 1995496 0 1992272 597 448 149 181 0 357 0 vmsppl 272 22048 0 21750 24 3 21 21 0 8 1 rwobjpl 24 463590 0 455291 62 10 52 52 0 8 0 pdppl 4096 44104 0 43772 1704 1368 336 336 0 8 4 pvpl 32 10371148 0 10347517 681 474 207 264 0 265 0 pmappl 216 22048 0 21750 17 0 17 17 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 5547 0 4447 63 30 33 41 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff82547276) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff825bae63,ffffffff825cabcb,568,ffffffff8255b781) at __assert+0x25 sys/kern/subr_prf.c:161 m_align(fffffd8068864400,ffffffd9) at m_align+0x1a0 sys/kern/uipc_mbuf.c:1385 bpf_movein(ffff80002e795920,ffff800000bf1a00,ffff80002e795688,ffff80002e795588) at bpf_movein+0x25e sys/net/bpf.c:228 bpfwrite(41700,ffff80002e795920,1) at bpfwrite+0x128 sys/net/bpf.c:644 spec_write(ffff80002e795780) at spec_write+0xcb sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd807e8be3d0,ffff80002e795920,1,fffffd807f7d8600) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd806a3f93d0,ffff80002e795920,1) at vn_write+0x19c sys/kern/vfs_vnops.c:414 dofilewritev(ffff80002653c7e8,3,ffff80002e795920,1,ffff80002e795a20) at dofilewritev+0x19c sys/kern/sys_generic.c:381 sys_pad_pwrite(ffff80002653c7e8,ffff80002e7959c8,ffff80002e795a20) at sys_pad_pwrite+0x92 sys_pwrite sys/kern/vfs_syscalls.c:3354 [inline] sys_pad_pwrite(ffff80002653c7e8,ffff80002e7959c8,ffff80002e795a20) at sys_pad_pwrite+0x92 sys/kern/vfs_syscalls.c:3426 syscall(ffff80002e795a90) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8d3ad245760, count: -13 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff82547276) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff825bae63,ffffffff825cabcb,568,ffffffff8255b781) at __assert+0x25 sys/kern/subr_prf.c:161 m_align(fffffd8068864400,ffffffd9) at m_align+0x1a0 sys/kern/uipc_mbuf.c:1385 bpf_movein(ffff80002e795920,ffff800000bf1a00,ffff80002e795688,ffff80002e795588) at bpf_movein+0x25e sys/net/bpf.c:228 bpfwrite(41700,ffff80002e795920,1) at bpfwrite+0x128 sys/net/bpf.c:644 spec_write(ffff80002e795780) at spec_write+0xcb sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd807e8be3d0,ffff80002e795920,1,fffffd807f7d8600) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd806a3f93d0,ffff80002e795920,1) at vn_write+0x19c sys/kern/vfs_vnops.c:414 dofilewritev(ffff80002653c7e8,3,ffff80002e795920,1,ffff80002e795a20) at dofilewritev+0x19c sys/kern/sys_generic.c:381 sys_pad_pwrite(ffff80002653c7e8,ffff80002e7959c8,ffff80002e795a20) at sys_pad_pwrite+0x92 sys_pwrite sys/kern/vfs_syscalls.c:3354 [inline] sys_pad_pwrite(ffff80002653c7e8,ffff80002e7959c8,ffff80002e795a20) at sys_pad_pwrite+0x92 sys/kern/vfs_syscalls.c:3426 syscall(ffff80002e795a90) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8d3ad245760, count: -13