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 *330687 5424 0 0 0x4000000 0 syz-executor.5 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff8254e79b) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff825bffff,ffffffff825d4d25,568,ffffffff825659c6) at __assert+0x25 sys/kern/subr_prf.c:161 m_align(fffffd806766f800,fffffff1) at m_align+0x1a0 sys/kern/uipc_mbuf.c:1385 bpf_movein(ffff800022f03ab8,ffff800000c56e00,ffff800022f03798,ffff800022f03698) at bpf_movein+0x25e sys/net/bpf.c:228 bpfwrite(41700,ffff800022f03ab8,1) at bpfwrite+0x128 sys/net/bpf.c:648 spec_write(ffff800022f03890) at spec_write+0xcb sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd805b21a3b0,ffff800022f03ab8,1,fffffd807f7d8660) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd8072b99f08,ffff800022f03ab8,1) at vn_write+0x19c sys/kern/vfs_vnops.c:414 dofilewritev(ffff8000230be7e8,6,ffff800022f03ab8,1,ffff800022f03bc0) at dofilewritev+0x19c sys/kern/sys_generic.c:381 sys_pad_pwritev(ffff8000230be7e8,ffff800022f03b68,ffff800022f03bc0) at sys_pad_pwritev+0xb9 sys_pwritev sys/kern/vfs_syscalls.c:3383 [inline] sys_pad_pwritev(ffff8000230be7e8,ffff800022f03b68,ffff800022f03bc0) at sys_pad_pwritev+0xb9 sys/kern/vfs_syscalls.c:3439 syscall(ffff800022f03c30) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbbd1d4d4b20, 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(ffffffff8254e79b) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff825bffff,ffffffff825d4d25,568,ffffffff825659c6) at __assert+0x25 sys/kern/subr_prf.c:161 m_align(fffffd806766f800,fffffff1) at m_align+0x1a0 sys/kern/uipc_mbuf.c:1385 bpf_movein(ffff800022f03ab8,ffff800000c56e00,ffff800022f03798,ffff800022f03698) at bpf_movein+0x25e sys/net/bpf.c:228 bpfwrite(41700,ffff800022f03ab8,1) at bpfwrite+0x128 sys/net/bpf.c:648 spec_write(ffff800022f03890) at spec_write+0xcb sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd805b21a3b0,ffff800022f03ab8,1,fffffd807f7d8660) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd8072b99f08,ffff800022f03ab8,1) at vn_write+0x19c sys/kern/vfs_vnops.c:414 dofilewritev(ffff8000230be7e8,6,ffff800022f03ab8,1,ffff800022f03bc0) at dofilewritev+0x19c sys/kern/sys_generic.c:381 sys_pad_pwritev(ffff8000230be7e8,ffff800022f03b68,ffff800022f03bc0) at sys_pad_pwritev+0xb9 sys_pwritev sys/kern/vfs_syscalls.c:3383 [inline] sys_pad_pwritev(ffff8000230be7e8,ffff800022f03b68,ffff800022f03bc0) at sys_pad_pwritev+0xb9 sys/kern/vfs_syscalls.c:3439 syscall(ffff800022f03c30) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbbd1d4d4b20, count: -13 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff800022f034c0 rbx 0x38 rdx 0 rcx 0 rax 0xffff8000230be7e8 r8 0 r9 0x8080808080808080 r10 0xf01e37514fe138df r11 0x6baf5ce30951b7f6 r12 0 r13 0xfffffff1 r14 0 r15 0x1 rip 0xffffffff820919b8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800022f034b0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.5) pid=330687 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=74, nice=20 forw=0xffffffffffffffff, list=0xffff8000230be548,0xffffffff8299d1c8 process=0xffff800021626fc0 user=0xffff800022efe000, vmspace=0xfffffd805a8a9cc8 estcpu=24, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 5424 268648 10016 0 2 0 syz-executor.5 * 5424 330687 10016 0 7 0x4000000 syz-executor.5 5814 89078 58255 0 2 0x4081000 syz-executor.2 5814 176846 58255 0 3 0x4081000 inode syz-executor.2 5814 102177 58255 0 3 0x4003000 suspend syz-executor.2 72464 99168 97905 0 2 0 syz-executor.1 69296 293319 94375 0 2 0x482 syz-executor.3 91209 216393 0 0 3 0x14200 acct acct 67427 329660 94375 0 2 0x482 syz-executor.4 2413 239560 94375 0 2 0x2 syz-executor.7 10016 380458 94375 0 2 0x482 syz-executor.5 64565 192687 94375 0 2 0x482 syz-executor.0 58255 389574 94375 0 2 0x482 syz-executor.2 97905 99330 94375 0 2 0x482 syz-executor.1 88426 440214 0 0 3 0x14280 nfsidl nfsio 68243 173880 0 0 3 0x14280 nfsidl nfsio 12703 180145 0 0 3 0x14280 nfsidl nfsio 27971 253644 0 0 3 0x14280 nfsidl nfsio 57836 312456 0 0 3 0x14280 nfsidl nfsio 69434 31958 0 0 3 0x14280 nfsidl nfsio 48806 94679 0 0 3 0x14280 nfsidl nfsio 22719 412692 0 0 3 0x14280 nfsidl nfsio 30200 108594 0 0 3 0x14280 nfsidl nfsio 68920 516921 0 0 3 0x14280 nfsidl nfsio 22831 213124 0 0 3 0x14280 nfsidl nfsio 20577 49451 0 0 3 0x14280 nfsidl nfsio 68969 273429 0 0 3 0x14280 nfsidl nfsio 5736 401468 0 0 3 0x14280 nfsidl nfsio 27639 269492 94375 0 2 0x482 syz-executor.6 95344 425595 0 0 3 0x14280 nfsidl nfsio 71506 200795 0 0 3 0x14280 nfsidl nfsio 17289 344740 0 0 3 0x14280 nfsidl nfsio 65889 128658 0 0 3 0x14280 nfsidl nfsio 57677 319242 0 0 3 0x14280 nfsidl nfsio 94462 409137 0 0 3 0x14280 nfsidl nfsio 71381 242713 0 0 3 0x14200 bored sosplice 94375 470767 35283 0 3 0x82 thrsleep syz-fuzzer 94375 316713 35283 0 2 0x4000002 syz-fuzzer 94375 424700 35283 0 3 0x4000082 thrsleep syz-fuzzer 94375 323501 35283 0 3 0x4000082 kqread syz-fuzzer 94375 322288 35283 0 3 0x4000082 thrsleep syz-fuzzer 94375 488651 35283 0 3 0x4000082 thrsleep syz-fuzzer 94375 221793 35283 0 3 0x4000082 thrsleep syz-fuzzer 94375 281243 35283 0 3 0x4000082 thrsleep syz-fuzzer 35283 206999 86021 0 3 0x10008a sigsusp ksh 86021 506273 53138 0 3 0x9a kqread sshd 96977 400991 1 0 3 0x100083 ttyin getty 53138 18377 1 0 3 0x88 kqread sshd 40575 301045 8173 73 3 0x100090 kqread syslogd 8173 470110 1 0 3 0x100082 netio syslogd 20029 144998 1 0 3 0x100080 kqread resolvd 27379 57977 14889 77 3 0x100092 kqread dhcpleased 44818 206238 14889 77 3 0x100092 kqread dhcpleased 14889 68161 1 0 3 0x80 kqread dhcpleased 63590 507372 0 0 3 0x14200 bored smr 11509 232244 0 0 2 0x14200 zerothread 40718 37296 0 0 3 0x14200 aiodoned aiodoned 84338 371960 0 0 3 0x14200 syncer update 88786 193098 0 0 3 0x14200 cleaner cleaner 38250 239603 0 0 3 0x14200 reaper reaper 98616 58387 0 0 3 0x14200 pgdaemon pagedaemon 83063 376083 0 0 3 0x14200 bored viomb 43273 253101 0 0 3 0x40014200 acpi0 acpi0 85854 423027 0 0 3 0x14200 bored softnet 49182 477660 0 0 3 0x14200 bored systqmp 43245 339399 0 0 3 0x14200 bored systq 64522 186778 0 0 3 0x40014200 bored softclock 36401 166952 0 0 3 0x40014200 idle0 1 521530 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 10239 6580K 8096K 78643K 94310 0 pcb 13 20K 23K 78643K 2731 0 rtable 219 15K 20K 78643K 6621 0 ifaddr 91 25K 29K 78643K 2874 0 sysctl 2 0K 0K 78643K 2 0 counters 27 17K 17K 78643K 275 0 ioctlops 0 0K 4K 78643K 7465 0 iov 0 0K 32K 78643K 1947 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1567 98K 99K 78643K 28500 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 164 0 VM map 2 0K 0K 78643K 2 0 sem 19 16K 32K 78643K 2084 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 14 49K 69K 78643K 19904 0 sigio 0 0K 0K 78643K 245 0 proc 60 55K 71K 78643K 3001 0 subproc 104 6K 7K 78643K 1031 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 1178 0 in_multi 87 6K 7K 78643K 2348 0 ether_multi 1 0K 0K 78643K 323 0 mrt 1 0K 0K 78643K 73 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 5045 0 pfkey data 0 0K 1K 78643K 14 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 510 794K 1434K 78643K 241824 0 UVM aobj 131 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 1105 0 NDP 14 0K 2K 78643K 588 0 temp 140 4695K 6241K 78643K 187540 0 kqueue 12 18K 28K 78643K 1290 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 1898 0 1895 29 28 1 4 0 8 0 rtentry 112 1496 0 1403 4 0 4 4 0 8 0 unpcb 136 12275 0 12262 149 148 1 10 0 8 0 syncache 296 36 0 36 11 11 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 45 0 45 2 2 0 1 0 8 0 tcpcb 736 7071 0 7034 293 289 4 17 0 8 0 arp 88 183 0 165 1 0 1 1 0 8 0 ipq 40 12 0 12 5 5 0 1 0 8 0 ipqe 40 153 0 153 5 5 0 1 0 8 0 inpcb 304 18477 0 18470 300 296 4 16 0 8 3 rttmr 72 24 0 24 5 5 0 1 0 8 0 ip6q 72 3 0 3 1 1 0 1 0 8 0 ip6af 40 3 0 3 1 1 0 1 0 8 0 nd6 48 433 0 412 1 0 1 1 0 8 0 pkpcb 40 191 0 191 13 13 0 2 0 8 0 kcovpl 48 79 0 71 1 0 1 1 0 8 0 ppxss 1152 45 0 45 11 11 0 1 0 8 0 pfstscr 40 305 0 305 4 4 0 1 0 8 0 pffrag 232 96 0 95 9 8 1 1 0 482 0 pffrnode 88 96 0 95 9 8 1 1 0 8 0 pffrent 40 3252 0 3251 12 11 1 1 0 8 0 pfosfp 40 11 0 7 1 0 1 1 0 8 0 pfosfpen 112 11 0 3 1 0 1 1 0 8 0 pfrktable 1344 965 0 965 6 6 0 1 0 8 0 pftag 88 27 0 24 2 1 1 1 0 8 0 pfstitem 24 164 0 164 2 2 0 1 0 8 0 pfstkey 112 606 0 606 4 4 0 1 0 8 0 pfstate 320 305 0 305 4 4 0 1 0 8 0 pfrule 1360 879 0 875 11 10 1 4 0 8 0 art_heap8 4096 5 0 4 4 3 1 3 0 8 0 art_heap4 256 8557 0 8131 54 25 29 31 0 8 0 art_table 32 8562 0 8135 4 0 4 4 0 8 0 art_node 16 1484 0 1402 1 0 1 1 0 8 0 semupl 112 8 0 8 2 2 0 1 0 8 0 semapl 112 2076 0 2059 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 27598 0 26104 94 0 94 94 0 8 0 ffsino 240 27598 0 26104 89 0 89 89 0 8 0 nchpl 144 53620 0 51993 62 0 62 62 0 8 0 uvmvnodes 80 6858 0 0 140 0 140 140 0 8 0 vnodes 224 6858 0 0 404 0 404 404 0 8 0 namei 1024 208520 0 208518 12 11 1 2 0 8 0 vcpupl 1984 113 0 0 15 0 15 15 0 8 0 vmpool 528 137 0 24 11 3 8 8 0 8 0 pfiaddrpl 120 301 0 301 6 6 0 1 0 8 0 scsiplug 72 3 0 3 1 1 0 1 0 8 0 scxspl 216 182021 0 182021 41 39 2 8 0 8 2 plimitpl 152 2855 0 2840 1 0 1 1 0 8 0 sigapl 424 20099 0 20039 9 1 8 8 0 8 0 futexpl 64 208944 0 208944 9 8 1 1 0 8 1 knotepl 120 172628 0 172545 27 23 4 10 0 8 0 kqueuepl 184 4871 0 4863 70 69 1 7 0 8 0 pipepl 304 2991 0 2963 75 70 5 8 0 8 2 fdescpl 432 20029 0 20004 4 0 4 4 0 8 0 filepl 120 146603 0 146360 223 212 11 20 0 8 1 lockfpl 104 7177 0 7174 16 15 1 3 0 8 0 lockfspl 48 1689 0 1686 1 0 1 1 0 8 0 sessionpl 144 94 0 78 1 0 1 1 0 8 0 pgrppl 48 118 0 102 1 0 1 1 0 8 0 ucredpl 96 17322 0 17311 1 0 1 1 0 8 0 zombiepl 144 20041 0 20036 2 1 1 1 0 8 0 processpl 1000 20099 0 20036 17 8 9 9 0 8 0 procpl 672 50604 0 50530 42 34 8 10 0 8 0 sosppl 168 158 0 158 31 30 1 1 0 8 1 sockpl 448 32860 0 32837 728 721 7 32 0 8 4 mcl64k 65536 988 0 988 49 48 1 1 0 8 1 mcl16k 16384 258 0 258 62 61 1 1 0 8 1 mcl12k 12288 726 0 726 45 44 1 1 0 8 1 mcl9k 9216 429 0 429 52 51 1 1 0 8 1 mcl8k 8192 1947 0 1947 31 30 1 1 0 8 1 mcl4k 4096 2188 0 2188 27 26 1 1 0 8 1 mcl2k2 2112 179 0 179 59 58 1 1 0 8 1 mcl2k 2048 125346 0 125203 115 95 20 45 0 8 0 mtagpl 96 13241 0 12323 59 34 25 33 0 8 0 mbufpl 256 373768 0 372666 622 544 78 302 0 8 3 bufpl 288 39522 0 33162 491 3 488 491 0 8 0 anonpl 24 5601723 0 5585714 332 199 133 151 0 188 0 amapchunkpl 152 1068306 0 1067636 3164 3050 114 662 0 158 83 amappl16 200 59735 0 59005 266 224 42 52 0 8 0 amappl15 192 1198 0 1191 1 0 1 1 0 8 0 amappl14 184 2629 0 2624 1 0 1 1 0 8 0 amappl13 176 4162 0 4158 1 0 1 1 0 8 0 amappl12 168 2365 0 2363 2 1 1 1 0 8 0 amappl11 160 1637 0 1622 1 0 1 1 0 8 0 amappl10 152 2766 0 2762 2 1 1 1 0 8 0 amappl9 144 5130 0 5125 1 0 1 1 0 8 0 amappl8 136 3304 0 3147 7 1 6 6 0 8 0 amappl7 128 1312 0 1302 1 0 1 1 0 8 0 amappl6 120 5079 0 5051 2 1 1 2 0 8 0 amappl5 112 17494 0 17481 1 0 1 1 0 8 0 amappl4 104 5019 0 4980 2 0 2 2 0 8 0 amappl3 96 6473 0 6458 1 0 1 1 0 8 0 amappl2 88 7820 0 7764 3 1 2 3 0 8 0 amappl1 80 351325 0 350817 19 6 13 18 0 8 0 amappl 88 239561 0 239307 8 0 8 8 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 72 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 20166 0 20028 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 20166 0 20028 1 0 1 1 0 8 0 vmmpekpl 168 133890 0 133817 4 0 4 4 0 8 0 vmmpepl 168 1828056 0 1825329 527 374 153 172 0 357 5 vmsppl 272 20165 0 20028 14 4 10 10 0 8 0 rwobjpl 24 429559 0 420813 64 9 55 55 0 8 0 pdppl 4096 40338 0 40169 1139 962 177 179 0 8 8 pvpl 32 9679518 0 9659524 630 419 211 269 0 265 0 pmappl 216 20165 0 20028 8 0 8 8 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 3841 0 2834 38 7 31 34 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(ffffffff8254e79b) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff825bffff,ffffffff825d4d25,568,ffffffff825659c6) at __assert+0x25 sys/kern/subr_prf.c:161 m_align(fffffd806766f800,fffffff1) at m_align+0x1a0 sys/kern/uipc_mbuf.c:1385 bpf_movein(ffff800022f03ab8,ffff800000c56e00,ffff800022f03798,ffff800022f03698) at bpf_movein+0x25e sys/net/bpf.c:228 bpfwrite(41700,ffff800022f03ab8,1) at bpfwrite+0x128 sys/net/bpf.c:648 spec_write(ffff800022f03890) at spec_write+0xcb sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd805b21a3b0,ffff800022f03ab8,1,fffffd807f7d8660) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd8072b99f08,ffff800022f03ab8,1) at vn_write+0x19c sys/kern/vfs_vnops.c:414 dofilewritev(ffff8000230be7e8,6,ffff800022f03ab8,1,ffff800022f03bc0) at dofilewritev+0x19c sys/kern/sys_generic.c:381 sys_pad_pwritev(ffff8000230be7e8,ffff800022f03b68,ffff800022f03bc0) at sys_pad_pwritev+0xb9 sys_pwritev sys/kern/vfs_syscalls.c:3383 [inline] sys_pad_pwritev(ffff8000230be7e8,ffff800022f03b68,ffff800022f03bc0) at sys_pad_pwritev+0xb9 sys/kern/vfs_syscalls.c:3439 syscall(ffff800022f03c30) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbbd1d4d4b20, 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(ffffffff8254e79b) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff825bffff,ffffffff825d4d25,568,ffffffff825659c6) at __assert+0x25 sys/kern/subr_prf.c:161 m_align(fffffd806766f800,fffffff1) at m_align+0x1a0 sys/kern/uipc_mbuf.c:1385 bpf_movein(ffff800022f03ab8,ffff800000c56e00,ffff800022f03798,ffff800022f03698) at bpf_movein+0x25e sys/net/bpf.c:228 bpfwrite(41700,ffff800022f03ab8,1) at bpfwrite+0x128 sys/net/bpf.c:648 spec_write(ffff800022f03890) at spec_write+0xcb sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd805b21a3b0,ffff800022f03ab8,1,fffffd807f7d8660) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd8072b99f08,ffff800022f03ab8,1) at vn_write+0x19c sys/kern/vfs_vnops.c:414 dofilewritev(ffff8000230be7e8,6,ffff800022f03ab8,1,ffff800022f03bc0) at dofilewritev+0x19c sys/kern/sys_generic.c:381 sys_pad_pwritev(ffff8000230be7e8,ffff800022f03b68,ffff800022f03bc0) at sys_pad_pwritev+0xb9 sys_pwritev sys/kern/vfs_syscalls.c:3383 [inline] sys_pad_pwritev(ffff8000230be7e8,ffff800022f03b68,ffff800022f03bc0) at sys_pad_pwritev+0xb9 sys/kern/vfs_syscalls.c:3439 syscall(ffff800022f03c30) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbbd1d4d4b20, count: -13