panic: kernel diagnostic assertion "len >= 0 && !M_READONLY(m)" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/uipc_mbuf.c", line 1384 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *112125 33962 0 0 0x4000000 0K syz-executor.7 510059 52943 0 0x12 0 1 sshd db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff8257162d) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff825e9dfe,ffffffff8255a0b2,568,ffffffff8258855b) at __assert+0x25 sys/kern/subr_prf.c:161 m_align(fffffd8067ddad00,ffffffd0) at m_align+0x1a0 sys/kern/uipc_mbuf.c:1385 bpf_movein(ffff800029314180,ffff800000c7b000,ffff800029313ee8,ffff800029313de8) at bpf_movein+0x25e sys/net/bpf.c:228 bpfwrite(51700,ffff800029314180,1) at bpfwrite+0x169 sys/net/bpf.c:644 spec_write(ffff800029313fe0) at spec_write+0xd4 sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd807e5d17a0,ffff800029314180,1,fffffd807f7d8420) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd8067a83020,ffff800029314180,1) at vn_write+0x1a1 sys/kern/vfs_vnops.c:414 dofilewritev(ffff80002e412548,5,ffff800029314180,1,ffff800029314280) at dofilewritev+0x19c sys/kern/sys_generic.c:381 sys_pad_pwrite(ffff80002e412548,ffff800029314228,ffff800029314280) at sys_pad_pwrite+0x92 sys_pwrite sys/kern/vfs_syscalls.c:3354 [inline] sys_pad_pwrite(ffff80002e412548,ffff800029314228,ffff800029314280) at sys_pad_pwrite+0x92 sys/kern/vfs_syscalls.c:3426 syscall(ffff8000293142f0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000293142f0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x698b8cd2250, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: kernel diagnostic assertion "len >= 0 && !M_READONLY(m)" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/uipc_mbuf.c", line 1384 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff8257162d) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff825e9dfe,ffffffff8255a0b2,568,ffffffff8258855b) at __assert+0x25 sys/kern/subr_prf.c:161 m_align(fffffd8067ddad00,ffffffd0) at m_align+0x1a0 sys/kern/uipc_mbuf.c:1385 bpf_movein(ffff800029314180,ffff800000c7b000,ffff800029313ee8,ffff800029313de8) at bpf_movein+0x25e sys/net/bpf.c:228 bpfwrite(51700,ffff800029314180,1) at bpfwrite+0x169 sys/net/bpf.c:644 spec_write(ffff800029313fe0) at spec_write+0xd4 sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd807e5d17a0,ffff800029314180,1,fffffd807f7d8420) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd8067a83020,ffff800029314180,1) at vn_write+0x1a1 sys/kern/vfs_vnops.c:414 dofilewritev(ffff80002e412548,5,ffff800029314180,1,ffff800029314280) at dofilewritev+0x19c sys/kern/sys_generic.c:381 sys_pad_pwrite(ffff80002e412548,ffff800029314228,ffff800029314280) at sys_pad_pwrite+0x92 sys_pwrite sys/kern/vfs_syscalls.c:3354 [inline] sys_pad_pwrite(ffff80002e412548,ffff800029314228,ffff800029314280) at sys_pad_pwrite+0x92 sys/kern/vfs_syscalls.c:3426 syscall(ffff8000293142f0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000293142f0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x698b8cd2250, count: -13 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800029313c00 rbx 0xffffffff8291abff cpu_info_full_primary+0x2bff rdx 0xffff800000044a00 rcx 0 rax 0xffff80002e412548 r8 0 r9 0x8080808080808080 r10 0x7e3064696ecc9e6e r11 0xd6595760675c9c4b r12 0xffffffff8291aa00 cpu_info_full_primary+0x2a00 r13 0 r14 0 r15 0x1 rip 0xffffffff81f80a58 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800029313bf0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.7) pid=112125 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=59, nice=20 forw=0xffffffffffffffff, list=0xffff80002e413268,0xffff80002e4122b8 process=0xffff80002e3c8870 user=0xffff80002930f000, vmspace=0xfffffd80670edd00 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 47224 127687 74253 0 2 0 syz-executor.3 47224 278003 74253 0 2 0x4000000 syz-executor.3 32334 216400 64544 0 2 0 syz-executor.0 32334 390271 64544 0 2 0x4000000 syz-executor.0 5081 403004 25141 0 2 0 syz-executor.6 5081 132397 25141 0 2 0x4000000 syz-executor.6 33962 141015 50793 0 2 0 syz-executor.7 *33962 112125 50793 0 7 0x4000000 syz-executor.7 44930 435158 44134 0 2 0 syz-executor.5 44930 54309 44134 0 3 0x4000080 fsleep syz-executor.5 44930 2553 44134 0 2 0x4000000 syz-executor.5 44134 329657 21973 0 2 0x2 syz-executor.5 74253 428510 21973 0 2 0x482 syz-executor.3 39773 361315 0 0 3 0x14200 acct acct 65629 115925 21973 0 2 0x2 syz-executor.1 71768 414561 0 0 3 0x14280 nfsidl nfsio 38540 15600 0 0 3 0x14280 nfsidl nfsio 81303 379284 0 0 3 0x14280 nfsidl nfsio 79342 506621 0 0 3 0x14280 nfsidl nfsio 21482 176266 0 0 3 0x14280 nfsidl nfsio 76790 158669 0 0 3 0x14280 nfsidl nfsio 12994 444063 0 0 3 0x14280 nfsidl nfsio 83022 68873 0 0 3 0x14280 nfsidl nfsio 39922 428045 0 0 3 0x14280 nfsidl nfsio 79387 177822 0 0 3 0x14280 nfsidl nfsio 79285 87171 0 0 3 0x14280 nfsidl nfsio 35891 492035 0 0 3 0x14280 nfsidl nfsio 70541 359476 0 0 3 0x14280 nfsidl nfsio 20770 14186 0 0 3 0x14280 nfsidl nfsio 38833 252490 0 0 3 0x14280 nfsidl nfsio 18289 47185 0 0 3 0x14280 nfsidl nfsio 68852 331158 0 0 3 0x14280 nfsidl nfsio 33605 230886 0 0 3 0x14280 nfsidl nfsio 88528 93540 0 0 3 0x14280 nfsidl nfsio 92858 235470 0 0 3 0x14280 nfsidl nfsio 62421 321040 0 0 3 0x14200 bored sosplice 9272 328354 21973 0 2 0x2 syz-executor.4 25141 375445 21973 0 3 0x82 nanoslp syz-executor.6 50793 379392 21973 0 2 0x2 syz-executor.7 65508 419949 21973 0 2 0x2 syz-executor.2 64544 312080 21973 0 3 0x82 nanoslp syz-executor.0 21973 271052 49194 0 3 0x82 thrsleep syz-fuzzer 21973 35926 49194 0 3 0x4000082 nanoslp syz-fuzzer 21973 196882 49194 0 3 0x4000082 thrsleep syz-fuzzer 21973 267632 49194 0 3 0x4000082 thrsleep syz-fuzzer 21973 293917 49194 0 3 0x4000082 nanoslp syz-fuzzer 21973 204249 49194 0 3 0x4000082 kqread syz-fuzzer 21973 353545 49194 0 3 0x4000082 thrsleep syz-fuzzer 21973 343785 49194 0 3 0x4000082 thrsleep syz-fuzzer 49194 218664 52943 0 3 0x10008a sigsusp ksh 52943 510059 20769 0 7 0x12 sshd 52674 323880 1 0 3 0x100083 ttyopn getty 20769 471713 1 0 3 0x88 kqread sshd 28408 329115 68778 74 3 0x100092 bpf pflogd 68778 406557 1 0 3 0x80 netio pflogd 52684 391911 25430 73 2 0x100010 syslogd 25430 255464 1 0 3 0x100082 netio syslogd 61599 413019 1 0 3 0x100080 kqread resolvd 98392 468359 1657 77 3 0x100092 kqread dhcpleased 87566 516046 1657 77 3 0x100092 kqread dhcpleased 1657 331332 1 0 3 0x80 kqread dhcpleased 60481 126022 0 0 2 0x14200 smr 67004 328836 0 0 2 0x14200 zerothread 59 159743 0 0 3 0x14200 aiodoned aiodoned 70825 177644 0 0 3 0x14200 syncer update 90770 521762 0 0 3 0x14200 cleaner cleaner 60916 424764 0 0 3 0x14200 reaper reaper 25681 200595 0 0 3 0x14200 pgdaemon pagedaemon 60322 263000 0 0 3 0x14200 bored viomb 37903 492189 0 0 3 0x40014200 acpi0 acpi0 13853 493741 0 0 3 0x40014200 idle1 91799 259872 0 0 2 0x14200 softnet 78391 239464 0 0 3 0x14200 bored systqmp 73413 312024 0 0 3 0x14200 bored systq 50898 41086 0 0 2 0x40014200 softclock 76649 195559 0 0 3 0x40014200 idle0 1 406829 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 33962 (syz-executor.7) thread 0xffff80002e412548 (112125) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82b05080) #0 witness_lock+0x44d #1 vn_write+0x42 sys/kern/vfs_vnops.c:399 #2 dofilewritev+0x19c sys/kern/sys_generic.c:381 #3 sys_pad_pwrite+0x92 sys_pwrite sys/kern/vfs_syscalls.c:3354 [inline] #3 sys_pad_pwrite+0x92 sys/kern/vfs_syscalls.c:3426 #4 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #4 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #5 Xsyscall+0x128 Process 52943 (sshd) thread 0xffff8000ffff6a90 (510059) exclusive rwlock netlock r = 0 (0xffffffff82961b60) #0 witness_lock+0x44d #1 solock+0x86 sys/kern/uipc_socket2.c:295 #2 sosend+0x517 sys/kern/uipc_socket.c:580 #3 dofilewritev+0x19c sys/kern/sys_generic.c:381 #4 sys_write+0x83 sys/kern/sys_generic.c:301 #5 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #5 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #6 Xsyscall+0x128 Process 52684 (syslogd) thread 0xffff8000ffff77b0 (391911) exclusive rrwlock inode r = 0 (0xfffffd806e73c810) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 sys_fsync+0xf5 sys/kern/vfs_syscalls.c:2923 #6 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #6 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #7 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10224 6629K 7452K 78643K 26055 0 pcb 13 14K 16K 78643K 742 0 rtable 217 9K 12K 78643K 1129 0 ifaddr 91 19K 20K 78643K 487 0 sysctl 2 0K 0K 78643K 2 0 counters 56 35K 36K 78643K 116 0 ioctlops 0 0K 8K 78643K 3634 0 iov 0 0K 24K 78643K 300 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1434 90K 90K 78643K 4538 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 37 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 25 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 15 53K 89K 78643K 3690 0 sigio 0 0K 0K 78643K 48 0 proc 71 87K 136K 78643K 803 0 subproc 104 6K 6K 78643K 195 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 273 0 in_multi 87 5K 6K 78643K 282 0 ether_multi 1 0K 0K 78643K 56 0 mrt 1 0K 0K 78643K 46 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 247 1102K 1102K 78643K 247 0 exec 0 0K 2K 78643K 1191 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 389 334K 348K 78643K 49292 0 UVM aobj 7 6K 6K 78643K 10 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 244 0 NDP 12 0K 2K 78643K 71 0 temp 142 4717K 4786K 78643K 44715 0 kqueue 12 18K 24K 78643K 244 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 279 0 276 6 5 1 3 0 8 0 rtentry 112 275 0 184 4 0 4 4 0 8 0 unpcb 136 2896 0 2881 21 20 1 6 0 8 0 syncache 296 19 0 19 5 5 0 1 0 8 0 tcpqe 32 5 0 5 2 2 0 1 0 8 0 tcpcb 736 1222 0 1217 38 37 1 13 0 8 0 arp 120 31 0 17 1 0 1 1 0 8 0 inpcb 304 3263 0 3256 37 36 1 11 0 8 0 rttmr 72 16 0 16 2 2 0 1 0 8 0 nd6 48 46 0 22 1 0 1 1 0 8 0 pkpcb 40 21 0 21 3 3 0 1 0 8 0 kcovpl 48 15 0 7 1 0 1 1 0 8 0 ppxss 1248 8 0 8 3 3 0 1 0 8 0 pfstscr 40 4 0 4 1 1 0 1 0 8 0 pffrag 232 18 0 15 3 2 1 1 0 482 0 pffrnode 88 18 0 15 3 2 1 1 0 8 0 pffrent 40 289 0 286 3 2 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfrke_plain 168 3 0 2 2 1 1 1 0 8 0 pfrktable 1344 137 0 131 3 2 1 2 0 8 0 pftag 88 5 0 0 1 0 1 1 0 8 0 pfstitem 24 91 0 89 1 0 1 1 0 8 0 pfstkey 112 97 0 95 2 1 1 2 0 8 0 pfstate 320 93 0 91 6 5 1 6 0 8 0 pfrule 1360 191 0 164 6 3 3 3 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 808 0 405 30 3 27 29 0 8 0 art_table 32 809 0 405 4 0 4 4 0 8 0 art_node 16 210 0 131 1 0 1 1 0 8 0 sysvmsgpl 40 54 0 14 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 21 0 11 1 0 1 1 0 8 0 shmpl 112 7 0 3 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 6191 0 4749 91 0 91 91 0 8 0 ffsino 272 6191 0 4749 97 0 97 97 0 8 0 nchpl 144 11173 0 9540 63 0 63 63 0 8 0 rtmask 32 6 0 5 2 1 1 1 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 224 5926 0 0 349 0 349 349 0 8 0 namei 1024 41100 0 41100 3 2 1 2 0 8 1 percpumem 16 70 0 30 1 0 1 1 0 8 0 vcpupl 2048 51 0 0 7 0 7 7 0 8 0 vmpool 560 63 0 12 4 0 4 4 0 8 0 pfiaddrpl 120 20 0 15 1 0 1 1 0 8 0 scsiplug 72 2 0 2 1 0 1 1 0 8 1 scxspl 216 31885 0 31885 16 15 1 8 0 8 1 plimitpl 152 268 0 253 1 0 1 1 0 8 0 sigapl 424 4000 0 3936 9 1 8 8 0 8 0 futexpl 64 33329 0 33328 3 2 1 1 0 8 0 knotepl 120 189 0 0 5 0 5 5 0 8 0 kqueuepl 216 746 0 738 15 14 1 5 0 8 0 pipepl 336 531 0 503 4 1 3 4 0 8 0 fdescpl 496 3964 0 3936 6 2 4 5 0 8 0 filepl 152 26251 0 25991 56 45 11 20 0 8 0 lockfpl 104 672 0 670 1 0 1 1 0 8 0 lockfspl 48 250 0 248 1 0 1 1 0 8 0 sessionpl 144 31 0 14 1 0 1 1 0 8 0 pgrppl 48 37 0 20 1 0 1 1 0 8 0 ucredpl 96 3090 0 3077 1 0 1 1 0 8 0 zombiepl 144 3936 0 3936 1 0 1 1 0 8 1 processpl 1064 4000 0 3936 5 0 5 5 0 8 0 procpl 672 11413 0 11336 14 6 8 9 0 8 0 srpgc 96 10 0 10 3 3 0 1 0 8 0 sosppl 168 47 0 47 8 8 0 1 0 8 0 sockpl 480 6464 0 6439 121 117 4 27 0 8 0 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 15 0 0 2 0 2 2 0 8 0 mcl12k 12288 24 0 0 2 0 2 2 0 8 0 mcl9k 9216 11 0 0 1 0 1 1 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 6 0 0 1 0 1 1 0 8 0 mcl2k 2048 235 0 0 28 0 28 28 0 8 0 mtagpl 96 1289 0 0 30 0 30 30 0 8 0 mbufpl 256 1549 0 0 91 1 90 90 0 8 0 bufpl 288 9697 0 3361 453 0 453 453 0 8 0 anonpl 24 1117123 0 1097676 221 74 147 151 0 186 19 amapchunkpl 152 121801 0 120940 76 30 46 50 0 158 8 amappl16 200 10186 0 9604 72 40 32 44 0 8 0 amappl15 192 380 0 371 1 0 1 1 0 8 0 amappl14 184 875 0 871 1 0 1 1 0 8 0 amappl13 176 120 0 117 1 0 1 1 0 8 0 amappl12 168 644 0 640 2 1 1 1 0 8 0 amappl11 160 1189 0 1167 1 0 1 1 0 8 0 amappl10 152 58 0 50 1 0 1 1 0 8 0 amappl9 144 765 0 762 1 0 1 1 0 8 0 amappl8 136 1266 0 1189 3 0 3 3 0 8 0 amappl7 128 642 0 629 1 0 1 1 0 8 0 amappl6 120 521 0 501 2 1 1 2 0 8 0 amappl5 112 2574 0 2559 1 0 1 1 0 8 0 amappl4 104 2961 0 2927 2 1 1 2 0 8 0 amappl3 96 1011 0 998 1 0 1 1 0 8 0 amappl2 88 1235 0 1186 3 1 2 3 0 8 0 amappl1 80 76007 0 75434 19 5 14 19 0 8 0 amappl 88 48616 0 48346 9 1 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 9 0 3 1 0 1 1 0 8 0 uaddrrnd 24 4027 0 3948 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4027 0 3948 1 0 1 1 0 8 0 vmmpekpl 168 33240 0 33174 4 0 4 4 0 8 0 vmmpepl 168 364671 0 362090 192 69 123 153 0 357 1 vmsppl 368 4026 0 3948 10 2 8 8 0 8 0 rwobjpl 56 95171 0 87638 115 6 109 111 0 8 0 pdppl 4096 8061 0 7947 283 163 120 121 0 8 6 pvpl 32 1961652 0 1937799 412 155 257 270 0 265 49 pmappl 248 4026 0 3948 7 1 6 6 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 1159 0 214 28 0 28 28 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff8257162d) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff825e9dfe,ffffffff8255a0b2,568,ffffffff8258855b) at __assert+0x25 sys/kern/subr_prf.c:161 m_align(fffffd8067ddad00,ffffffd0) at m_align+0x1a0 sys/kern/uipc_mbuf.c:1385 bpf_movein(ffff800029314180,ffff800000c7b000,ffff800029313ee8,ffff800029313de8) at bpf_movein+0x25e sys/net/bpf.c:228 bpfwrite(51700,ffff800029314180,1) at bpfwrite+0x169 sys/net/bpf.c:644 spec_write(ffff800029313fe0) at spec_write+0xd4 sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd807e5d17a0,ffff800029314180,1,fffffd807f7d8420) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd8067a83020,ffff800029314180,1) at vn_write+0x1a1 sys/kern/vfs_vnops.c:414 dofilewritev(ffff80002e412548,5,ffff800029314180,1,ffff800029314280) at dofilewritev+0x19c sys/kern/sys_generic.c:381 sys_pad_pwrite(ffff80002e412548,ffff800029314228,ffff800029314280) at sys_pad_pwrite+0x92 sys_pwrite sys/kern/vfs_syscalls.c:3354 [inline] sys_pad_pwrite(ffff80002e412548,ffff800029314228,ffff800029314280) at sys_pad_pwrite+0x92 sys/kern/vfs_syscalls.c:3426 syscall(ffff8000293142f0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000293142f0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x698b8cd2250, count: -13 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020ce8ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff82b04e78) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82b04e78) at __mp_lock+0x133 sys/kern/kern_lock.c:147 syscall(ffff8000211c2320) at syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline] syscall(ffff8000211c2320) at syscall+0x3ef sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffce9a0, count: 9 ddb{1}> trace x86_ipi_db(ffff800020ce8ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff82b04e78) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82b04e78) at __mp_lock+0x133 sys/kern/kern_lock.c:147 syscall(ffff8000211c2320) at syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline] syscall(ffff8000211c2320) at syscall+0x3ef sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffce9a0, count: -6