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 *449530 37744 0 0 0x4000000 0K syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff825739a5) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff825e91ae,ffffffff8255ddc0,568,ffffffff8258c38b) at __assert+0x25 sys/kern/subr_prf.c:161 m_align(fffffd8067ad6800,ffffffd8) at m_align+0x1a0 sys/kern/uipc_mbuf.c:1385 bpf_movein(ffff80002e3a8950,ffff800000faae00,ffff80002e3a86b8,ffff80002e3a85b8) at bpf_movein+0x25e sys/net/bpf.c:228 bpfwrite(31700,ffff80002e3a8950,1) at bpfwrite+0x169 sys/net/bpf.c:648 spec_write(ffff80002e3a87b0) at spec_write+0xd4 sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd807e6745e0,ffff80002e3a8950,1,fffffd807f7d88a0) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd806c463ac8,ffff80002e3a8950,1) at vn_write+0x1a1 sys/kern/vfs_vnops.c:414 dofilewritev(ffff8000284d0d30,3,ffff80002e3a8950,1,ffff80002e3a8a50) at dofilewritev+0x19c sys/kern/sys_generic.c:381 sys_pad_pwrite(ffff8000284d0d30,ffff80002e3a89f8,ffff80002e3a8a50) at sys_pad_pwrite+0x92 sys_pwrite sys/kern/vfs_syscalls.c:3354 [inline] sys_pad_pwrite(ffff8000284d0d30,ffff80002e3a89f8,ffff80002e3a8a50) at sys_pad_pwrite+0x92 sys/kern/vfs_syscalls.c:3426 syscall(ffff80002e3a8ac0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e3a8ac0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa1fa290190, 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(ffffffff825739a5) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff825e91ae,ffffffff8255ddc0,568,ffffffff8258c38b) at __assert+0x25 sys/kern/subr_prf.c:161 m_align(fffffd8067ad6800,ffffffd8) at m_align+0x1a0 sys/kern/uipc_mbuf.c:1385 bpf_movein(ffff80002e3a8950,ffff800000faae00,ffff80002e3a86b8,ffff80002e3a85b8) at bpf_movein+0x25e sys/net/bpf.c:228 bpfwrite(31700,ffff80002e3a8950,1) at bpfwrite+0x169 sys/net/bpf.c:648 spec_write(ffff80002e3a87b0) at spec_write+0xd4 sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd807e6745e0,ffff80002e3a8950,1,fffffd807f7d88a0) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd806c463ac8,ffff80002e3a8950,1) at vn_write+0x1a1 sys/kern/vfs_vnops.c:414 dofilewritev(ffff8000284d0d30,3,ffff80002e3a8950,1,ffff80002e3a8a50) at dofilewritev+0x19c sys/kern/sys_generic.c:381 sys_pad_pwrite(ffff8000284d0d30,ffff80002e3a89f8,ffff80002e3a8a50) at sys_pad_pwrite+0x92 sys_pwrite sys/kern/vfs_syscalls.c:3354 [inline] sys_pad_pwrite(ffff8000284d0d30,ffff80002e3a89f8,ffff80002e3a8a50) at sys_pad_pwrite+0x92 sys/kern/vfs_syscalls.c:3426 syscall(ffff80002e3a8ac0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e3a8ac0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa1fa290190, count: -13 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002e3a83d0 rbx 0xffffffff82920bff cpu_info_full_primary+0x2bff rdx 0xffff800000e8ac00 rcx 0 rax 0xffff8000284d0d30 r8 0 r9 0x8080808080808080 r10 0xe65c1cc2fccfed20 r11 0xabec55645c1c7fa3 r12 0xffffffff82920a00 cpu_info_full_primary+0x2a00 r13 0 r14 0 r15 0x1 rip 0xffffffff8147cfe8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e3a83c0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=449530 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000284d0010,0xffffffff829adf40 process=0xffff8000284d69a8 user=0xffff80002e3a3000, vmspace=0xfffffd8066606018 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=2, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 37744 23512 79480 0 2 0 syz-executor.1 *37744 449530 79480 0 7 0x4000000 syz-executor.1 45316 293390 96212 0 2 0x10 syz-executor.2 45316 412881 96212 0 3 0x4000090 fsleep syz-executor.2 46400 523661 37483 0 2 0 syz-executor.7 46400 482704 37483 0 3 0x4000080 fsleep syz-executor.7 25593 132890 69725 0 2 0 syz-executor.3 25593 71747 69725 0 3 0x4000080 fsleep syz-executor.3 49527 140027 83206 0 2 0 syz-executor.0 49527 449435 83206 0 3 0x4000080 fsleep syz-executor.0 49527 450058 83206 0 3 0x4000080 fsleep syz-executor.0 3240 42062 91540 0 2 0x480 syz-executor.6 3240 140601 91540 0 3 0x4000080 netio syz-executor.6 3240 100403 91540 0 3 0x4000080 fsleep syz-executor.6 69725 484024 50283 0 2 0x482 syz-executor.3 72174 132461 50283 0 2 0x482 syz-executor.4 83206 141472 50283 0 2 0x482 syz-executor.0 79480 24288 50283 0 2 0x482 syz-executor.1 98693 409929 50283 0 2 0x482 syz-executor.5 96212 467723 50283 0 2 0x482 syz-executor.2 14224 22669 0 0 3 0x14280 nfsidl nfsio 56469 407186 0 0 3 0x14280 nfsidl nfsio 76828 18201 0 0 3 0x14280 nfsidl nfsio 86070 21953 0 0 3 0x14280 nfsidl nfsio 85576 69287 0 0 3 0x14280 nfsidl nfsio 60897 421961 0 0 3 0x14280 nfsidl nfsio 3559 397032 0 0 3 0x14280 nfsidl nfsio 38019 377242 0 0 3 0x14280 nfsidl nfsio 77131 518102 0 0 3 0x14280 nfsidl nfsio 15303 231219 0 0 3 0x14280 nfsidl nfsio 15510 479946 0 0 3 0x14280 nfsidl nfsio 73030 372579 0 0 3 0x14280 nfsidl nfsio 50278 90458 0 0 3 0x14280 nfsidl nfsio 28900 264286 0 0 3 0x14280 nfsidl nfsio 7773 410676 0 0 3 0x14280 nfsidl nfsio 80634 350995 0 0 3 0x14280 nfsidl nfsio 21262 155151 0 0 3 0x14280 nfsidl nfsio 46661 141285 0 0 3 0x14280 nfsidl nfsio 28613 412710 0 0 3 0x14280 nfsidl nfsio 74246 65094 0 0 3 0x14280 nfsidl nfsio 91540 113788 50283 0 2 0x482 syz-executor.6 37483 396320 50283 0 2 0x482 syz-executor.7 39782 519310 1 0 3 0x100083 ttyopn getty 96571 215088 0 0 3 0x14200 bored sosplice 50283 232644 82374 0 3 0x82 thrsleep syz-fuzzer 50283 104214 82374 0 3 0x4000082 thrsleep syz-fuzzer 50283 171586 82374 0 3 0x4000082 thrsleep syz-fuzzer 50283 194868 82374 0 3 0x4000082 thrsleep syz-fuzzer 50283 217618 82374 0 3 0x4000082 thrsleep syz-fuzzer 50283 22746 82374 0 3 0x4000082 kqread syz-fuzzer 50283 268542 82374 0 3 0x4000082 thrsleep syz-fuzzer 50283 181276 82374 0 3 0x4000082 thrsleep syz-fuzzer 50283 281132 82374 0 3 0x4000082 thrsleep syz-fuzzer 50283 257718 82374 0 3 0x4000082 thrsleep syz-fuzzer 82374 127703 75659 0 3 0x10008a sigsusp ksh 75659 112864 50121 0 3 0x9a kqread sshd 50121 223812 1 0 3 0x88 kqread sshd 12793 151138 77625 74 3 0x100092 bpf pflogd 77625 268697 1 0 3 0x80 netio pflogd 67197 188481 64530 73 3 0x100090 kqread syslogd 64530 289878 1 0 3 0x100082 netio syslogd 52045 242223 1 0 3 0x100080 kqread resolvd 99520 204138 21717 77 3 0x100092 kqread dhcpleased 62769 398127 21717 77 3 0x100092 kqread dhcpleased 21717 420547 1 0 3 0x80 kqread dhcpleased 39273 161858 0 0 3 0x14200 bored smr 5588 350498 0 0 2 0x14200 zerothread 39742 27079 0 0 3 0x14200 aiodoned aiodoned 67988 85549 0 0 3 0x14200 syncer update 71702 419851 0 0 3 0x14200 cleaner cleaner 4025 108559 0 0 3 0x14200 reaper reaper 40863 125460 0 0 3 0x14200 pgdaemon pagedaemon 9864 507911 0 0 3 0x14200 bored viomb 21668 170043 0 0 3 0x40014200 acpi0 acpi0 9710 375293 0 0 7 0x40014200 idle1 28220 330424 0 0 3 0x14200 bored softnet 95911 73333 0 0 3 0x14200 bored systqmp 56662 78024 0 0 3 0x14200 bored systq 20636 136283 0 0 2 0x40014200 softclock 23172 155222 0 0 3 0x40014200 idle0 1 366437 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 37744 (syz-executor.1) thread 0xffff8000284d0d30 (449530) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82a3d4a8) #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 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10238 6576K 7636K 78643K 249196 0 pcb 13 26K 30K 78643K 7937 0 rtable 218 19K 22K 78643K 9132 0 ifaddr 104 31K 37K 78643K 3439 0 sysctl 3 1K 4K 78643K 44 0 counters 58 35K 36K 78643K 1222 0 ioctlops 0 0K 6K 78643K 13054 0 iov 0 0K 28K 78643K 4637 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1764 110K 110K 78643K 67116 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 603 0 VM map 2 1K 1K 78643K 2 0 sem 23 320K 336K 78643K 703 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 16 57K 85K 78643K 60139 0 sigio 0 0K 0K 78643K 842 0 proc 71 87K 123K 78643K 6223 0 subproc 104 6K 14K 78643K 2202 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 2712 0 in_multi 79 5K 7K 78643K 4002 0 ether_multi 1 0K 0K 78643K 464 0 mrt 5 0K 0K 78643K 242 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 283 1261K 1261K 78643K 283 0 exec 0 0K 2K 78643K 10756 0 pfkey data 0 0K 0K 78643K 23 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 913 2401K 2417K 78643K 740268 0 UVM aobj 131 5K 5K 78643K 149 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 2805 0 NDP 15 0K 2K 78643K 1161 0 temp 161 4730K 8826K 78643K 661855 0 kqueue 13 20K 28K 78643K 3542 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 3584 0 3581 54 53 1 5 0 8 0 rtentry 112 2848 0 2763 6 3 3 4 0 8 0 unpcb 136 31371 0 31353 325 319 6 9 0 8 5 syncache 296 87 0 87 24 24 0 1 0 8 0 tcpqe 32 9 0 9 4 4 0 1 0 8 0 tcpcb 736 24155 0 24141 718 711 7 25 0 8 5 arp 120 344 0 330 1 0 1 1 0 8 0 inpcb 304 55244 0 55063 709 690 19 29 0 8 4 rttmr 72 141 0 141 22 22 0 1 0 8 0 nd6 48 801 0 780 1 0 1 1 0 8 0 pkpcb 40 163 0 163 33 33 0 1 0 8 0 kcovpl 48 143 0 135 1 0 1 1 0 8 0 ppxss 1248 248 0 248 55 55 0 1 0 8 0 pfstscr 40 11 0 11 2 2 0 1 0 8 0 pffrag 232 457 0 455 20 19 1 1 0 482 0 pffrnode 88 455 0 453 20 19 1 1 0 8 0 pffrent 40 2146 0 2144 21 20 1 1 0 8 0 pfosfp 40 1432 0 1008 5 0 5 5 0 8 0 pfosfpen 112 1432 0 714 21 0 21 21 0 8 0 pfrke_plain 168 25 0 25 4 4 0 1 0 8 0 pfrktable 1344 158 0 150 4 3 1 2 0 8 0 pftag 88 6 0 0 1 0 1 1 0 8 0 pfstitem 24 120 0 118 1 0 1 1 0 8 0 pfstkey 112 130 0 128 2 1 1 2 0 8 0 pfstate 320 123 0 121 6 5 1 5 0 8 0 pfrule 1360 196 0 154 6 2 4 4 0 8 0 art_heap8 4096 8 0 6 7 5 2 4 0 8 0 art_heap4 256 14578 0 14150 80 51 29 33 0 8 1 art_table 32 14586 0 14156 8 4 4 5 0 8 0 art_node 16 2756 0 2680 1 0 1 1 0 8 0 sysvmsgpl 40 40 0 0 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 687 0 666 1 0 1 1 0 8 0 shmpl 112 146 0 18 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 80561 0 78936 102 0 102 102 0 8 0 ffsino 272 80561 0 78936 109 0 109 109 0 8 0 nchpl 144 158258 0 156628 63 1 62 63 0 8 0 rtmask 32 30 0 30 4 4 0 1 0 8 0 uvmvnodes 80 6169 0 0 126 0 126 126 0 8 0 vnodes 224 6169 0 0 363 0 363 363 0 8 0 namei 1024 592275 0 592275 21 20 1 2 0 8 1 percpumem 16 623 0 582 1 0 1 1 0 8 0 vcpupl 2048 300 0 2 38 0 38 38 0 8 0 vmpool 560 514 0 216 24 2 22 22 0 8 0 pfiaddrpl 120 29 0 22 3 2 1 1 0 8 0 scsiplug 72 30 0 30 8 8 0 1 0 8 0 scxspl 216 450606 0 450606 67 66 1 8 0 8 1 plimitpl 152 6384 0 6369 1 0 1 1 0 8 0 sigapl 424 60322 0 60258 13 5 8 8 0 8 0 futexpl 64 589106 0 589100 12 11 1 1 0 8 0 knotepl 120 1382 0 0 12 2 10 11 0 8 0 kqueuepl 216 12935 0 12926 259 258 1 8 0 8 0 pipepl 336 12539 0 12511 349 341 8 13 0 8 5 fdescpl 496 60165 0 60136 7 3 4 5 0 8 0 filepl 152 429760 0 429509 614 596 18 23 0 8 6 lockfpl 104 16011 0 16009 36 34 2 4 0 8 1 lockfspl 48 4819 0 4817 2 1 1 2 0 8 0 sessionpl 144 163 0 146 1 0 1 1 0 8 0 pgrppl 48 458 0 441 1 0 1 1 0 8 0 ucredpl 96 52715 0 52693 1 0 1 1 0 8 0 zombiepl 144 60258 0 60256 10 9 1 1 0 8 0 processpl 1064 60322 0 60256 6 1 5 5 0 8 0 procpl 672 155545 0 155462 63 55 8 9 0 8 0 srpgc 96 146 0 146 40 40 0 1 0 8 0 sosppl 168 487 0 487 75 74 1 1 0 8 1 sockpl 480 90438 0 90236 1917 1883 34 55 0 8 7 mcl64k 65536 18 0 0 3 0 3 3 0 8 0 mcl16k 16384 14 0 0 2 0 2 2 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 15 0 0 2 0 2 2 0 8 0 mcl8k 8192 22 0 0 3 0 3 3 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 7 0 0 1 0 1 1 0 8 0 mcl2k 2048 1160 0 0 43 19 24 41 0 8 0 mtagpl 96 4005 0 0 50 0 50 50 0 8 0 mbufpl 256 10640 0 0 657 0 657 657 0 8 0 bufpl 288 92976 0 86793 453 0 453 453 0 8 0 anonpl 24 16841237 0 16814787 869 695 174 213 0 186 0 amapchunkpl 152 1847167 0 1846222 349 298 51 59 0 158 9 amappl16 200 171940 0 170834 471 407 64 82 0 8 0 amappl15 192 12223 0 12214 1 0 1 1 0 8 0 amappl14 184 13410 0 13398 1 0 1 1 0 8 0 amappl13 176 4396 0 4393 1 0 1 1 0 8 0 amappl12 168 5012 0 5004 1 0 1 1 0 8 0 amappl11 160 7279 0 7264 3 2 1 2 0 8 0 amappl10 152 2972 0 2962 1 0 1 1 0 8 0 amappl9 144 12525 0 12516 1 0 1 1 0 8 0 amappl8 136 11513 0 11251 11 1 10 10 0 8 0 amappl7 128 7503 0 7490 1 0 1 1 0 8 0 amappl6 120 12652 0 12614 3 1 2 2 0 8 0 amappl5 112 53485 0 53465 1 0 1 1 0 8 0 amappl4 104 20312 0 20278 3 1 2 2 0 8 0 amappl3 96 8936 0 8919 1 0 1 1 0 8 0 amappl2 88 9139 0 9052 3 1 2 3 0 8 0 amappl1 80 1064224 0 1063631 28 14 14 19 0 8 0 amappl 88 736240 0 735783 13 2 11 12 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 72 148 0 18 3 0 3 3 0 8 0 uaddrrnd 24 60679 0 60352 2 0 2 2 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 60679 0 60352 2 0 2 2 0 8 0 vmmpekpl 168 382327 0 382227 5 0 5 5 0 8 0 vmmpepl 168 5424982 0 5420985 958 758 200 218 0 357 1 vmsppl 368 60678 0 60352 34 4 30 30 0 8 0 rwobjpl 56 1271995 0 1263162 198 70 128 130 0 8 0 pdppl 4096 121365 0 121002 2207 1840 367 369 0 8 4 pvpl 32 28276902 0 28251626 1309 1086 223 281 0 265 0 pmappl 248 60678 0 60352 22 1 21 21 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 4841 0 2995 54 0 54 54 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(ffffffff825739a5) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff825e91ae,ffffffff8255ddc0,568,ffffffff8258c38b) at __assert+0x25 sys/kern/subr_prf.c:161 m_align(fffffd8067ad6800,ffffffd8) at m_align+0x1a0 sys/kern/uipc_mbuf.c:1385 bpf_movein(ffff80002e3a8950,ffff800000faae00,ffff80002e3a86b8,ffff80002e3a85b8) at bpf_movein+0x25e sys/net/bpf.c:228 bpfwrite(31700,ffff80002e3a8950,1) at bpfwrite+0x169 sys/net/bpf.c:648 spec_write(ffff80002e3a87b0) at spec_write+0xd4 sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd807e6745e0,ffff80002e3a8950,1,fffffd807f7d88a0) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd806c463ac8,ffff80002e3a8950,1) at vn_write+0x1a1 sys/kern/vfs_vnops.c:414 dofilewritev(ffff8000284d0d30,3,ffff80002e3a8950,1,ffff80002e3a8a50) at dofilewritev+0x19c sys/kern/sys_generic.c:381 sys_pad_pwrite(ffff8000284d0d30,ffff80002e3a89f8,ffff80002e3a8a50) at sys_pad_pwrite+0x92 sys_pwrite sys/kern/vfs_syscalls.c:3354 [inline] sys_pad_pwrite(ffff8000284d0d30,ffff80002e3a89f8,ffff80002e3a8a50) at sys_pad_pwrite+0x92 sys/kern/vfs_syscalls.c:3426 syscall(ffff80002e3a8ac0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e3a8ac0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa1fa290190, 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 acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020ce8ff0) at sched_idle+0x417 sys/kern/kern_sched.c:178 end trace frame: 0x0, count: 10 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 acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020ce8ff0) at sched_idle+0x417 sys/kern/kern_sched.c:178 end trace frame: 0x0, count: -5