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 *439318 69060 0 0 0x4000000 0K syz-executor.5 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff82577da7) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff825ebc34,ffffffff8255f654,568,ffffffff8258dc04) at __assert+0x25 sys/kern/subr_prf.c:161 m_align(fffffd8059388500,ffffffde) at m_align+0x1a0 sys/kern/uipc_mbuf.c:1385 bpf_movein(ffff800028015e20,ffff800000d53e00,ffff800028015b88,ffff800028015a88) at bpf_movein+0x25e sys/net/bpf.c:228 bpfwrite(a1700,ffff800028015e20,1) at bpfwrite+0x169 sys/net/bpf.c:644 spec_write(ffff800028015c80) at spec_write+0xd4 sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd8058845a38,ffff800028015e20,1,fffffd807f7d8540) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd8075adc150,ffff800028015e20,1) at vn_write+0x1a1 sys/kern/vfs_vnops.c:414 dofilewritev(ffff8000246867e8,7,ffff800028015e20,1,ffff800028015f20) at dofilewritev+0x19c sys/kern/sys_generic.c:381 sys_pad_pwrite(ffff8000246867e8,ffff800028015ec8,ffff800028015f20) at sys_pad_pwrite+0x92 sys_pwrite sys/kern/vfs_syscalls.c:3354 [inline] sys_pad_pwrite(ffff8000246867e8,ffff800028015ec8,ffff800028015f20) at sys_pad_pwrite+0x92 sys/kern/vfs_syscalls.c:3426 syscall(ffff800028015f90) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800028015f90) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9187561a5f0, 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(ffffffff82577da7) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff825ebc34,ffffffff8255f654,568,ffffffff8258dc04) at __assert+0x25 sys/kern/subr_prf.c:161 m_align(fffffd8059388500,ffffffde) at m_align+0x1a0 sys/kern/uipc_mbuf.c:1385 bpf_movein(ffff800028015e20,ffff800000d53e00,ffff800028015b88,ffff800028015a88) at bpf_movein+0x25e sys/net/bpf.c:228 bpfwrite(a1700,ffff800028015e20,1) at bpfwrite+0x169 sys/net/bpf.c:644 spec_write(ffff800028015c80) at spec_write+0xd4 sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd8058845a38,ffff800028015e20,1,fffffd807f7d8540) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd8075adc150,ffff800028015e20,1) at vn_write+0x1a1 sys/kern/vfs_vnops.c:414 dofilewritev(ffff8000246867e8,7,ffff800028015e20,1,ffff800028015f20) at dofilewritev+0x19c sys/kern/sys_generic.c:381 sys_pad_pwrite(ffff8000246867e8,ffff800028015ec8,ffff800028015f20) at sys_pad_pwrite+0x92 sys_pwrite sys/kern/vfs_syscalls.c:3354 [inline] sys_pad_pwrite(ffff8000246867e8,ffff800028015ec8,ffff800028015f20) at sys_pad_pwrite+0x92 sys/kern/vfs_syscalls.c:3426 syscall(ffff800028015f90) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800028015f90) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9187561a5f0, count: -13 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff8000280158a0 rbx 0xffffffff82966bff cpu_info_full_primary+0x2bff rdx 0xffff800000eb5d40 rcx 0 rax 0xffff8000246867e8 r8 0 r9 0x8080808080808080 r10 0xdf7087fc2bb6726f r11 0xc02bce932e49a8f8 r12 0xffffffff82966a00 cpu_info_full_primary+0x2a00 r13 0 r14 0 r15 0x1 rip 0xffffffff8228cc28 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800028015890 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.5) pid=439318 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=82, nice=20 forw=0xffffffffffffffff, list=0xffff800024686008,0xffff8000fffee018 process=0xffff8000ffff8430 user=0xffff800028011000, vmspace=0xfffffd8074f382e0 estcpu=32, cpticks=3, pctcpu=0.0 user=0, sys=2, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 4762 193827 24838 0 2 0 syz-executor.6 7983 291084 10942 0 2 0 syz-executor.3 17948 327180 45738 0 2 0 syz-executor.7 17948 498787 45738 0 3 0x4000080 fsleep syz-executor.7 3467 461547 15679 0 2 0 syz-executor.1 3467 13615 15679 0 3 0x4000080 fsleep syz-executor.1 3467 218990 15679 0 3 0x4000080 fsleep syz-executor.1 17535 300414 63872 0 2 0 syz-executor.2 17535 86464 63872 0 3 0x4000080 fsleep syz-executor.2 69060 83832 54034 0 2 0 syz-executor.5 *69060 439318 54034 0 7 0x4000000 syz-executor.5 10942 305769 88705 0 2 0x482 syz-executor.3 15679 411704 88705 0 2 0x482 syz-executor.1 45738 339956 88705 0 2 0x482 syz-executor.7 54034 112771 88705 0 2 0x482 syz-executor.5 24838 99375 88705 0 2 0x482 syz-executor.6 63872 62460 88705 0 2 0x482 syz-executor.2 9847 449520 88705 0 2 0x2 syz-executor.0 19264 164740 0 0 3 0x14200 acct acct 44650 312704 1 0 3 0x100083 ttyin getty 87391 399398 88705 0 2 0x482 syz-executor.4 60325 87522 0 0 3 0x14200 bored sosplice 88705 66211 14204 0 3 0x82 thrsleep syz-fuzzer 88705 127484 14204 0 2 0x4000482 syz-fuzzer 88705 144015 14204 0 3 0x4000082 thrsleep syz-fuzzer 88705 199928 14204 0 3 0x4000082 kqread syz-fuzzer 88705 150292 14204 0 3 0x4000082 thrsleep syz-fuzzer 88705 276430 14204 0 3 0x4000082 thrsleep syz-fuzzer 88705 331774 14204 0 3 0x4000082 thrsleep syz-fuzzer 88705 358694 14204 0 2 0x4000482 syz-fuzzer 88705 449325 14204 0 3 0x4000082 thrsleep syz-fuzzer 88705 37780 14204 0 3 0x4000082 thrsleep syz-fuzzer 88705 203938 14204 0 3 0x4000082 thrsleep syz-fuzzer 14204 83600 10317 0 3 0x10008a sigsusp ksh 10317 20831 35308 0 3 0x9a kqread sshd 35308 416895 1 0 3 0x88 kqread sshd 4897 386519 63858 74 3 0x100092 bpf pflogd 63858 194432 1 0 3 0x80 netio pflogd 28089 8221 71416 73 3 0x100090 kqread syslogd 71416 225128 1 0 3 0x100082 netio syslogd 15769 54562 1 0 3 0x100080 kqread resolvd 8617 104695 4950 77 3 0x100092 kqread dhcpleased 86545 516936 4950 77 3 0x100092 kqread dhcpleased 4950 200167 1 0 3 0x80 kqread dhcpleased 81351 474956 0 0 3 0x14200 bored smr 70646 165840 0 0 2 0x14200 zerothread 34074 218959 0 0 3 0x14200 aiodoned aiodoned 95127 403438 0 0 3 0x14200 syncer update 45028 432303 0 0 3 0x14200 cleaner cleaner 6375 34849 0 0 3 0x14200 reaper reaper 28712 289012 0 0 3 0x14200 pgdaemon pagedaemon 1963 447807 0 0 3 0x14200 bored viomb 58464 493173 0 0 3 0x40014200 acpi0 acpi0 94730 183209 0 0 7 0x40014200 idle1 40989 286322 0 0 3 0x14200 bored softnet 50063 280571 0 0 3 0x14200 bored systqmp 28015 122160 0 0 3 0x14200 bored systq 92384 306896 0 0 2 0x40014200 softclock 60841 29213 0 0 3 0x40014200 idle0 1 204976 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 69060 (syz-executor.5) thread 0xffff8000246867e8 (439318) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82a7ab80) #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 9847 (syz-executor.0) thread 0xffff800024686548 (449520) exclusive rrwlock inode r = 0 (0xfffffd805c9042c0) #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 ufs_ihashins+0x42 sys/ufs/ufs/ufs_ihash.c:140 #5 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1347 #6 ffs_inode_alloc+0x1be sys/ufs/ffs/ffs_alloc.c:394 #7 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1162 #8 VOP_MKDIR+0xbf sys/kern/vfs_vops.c:404 #9 domkdirat+0x121 sys/kern/vfs_syscalls.c:3100 #10 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #10 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806e3ac4e0) #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 vfs_lookup+0xd1 sys/kern/vfs_lookup.c:413 #6 namei+0x36a sys/kern/vfs_lookup.c:245 #7 domkdirat+0x75 sys/kern/vfs_syscalls.c:3085 #8 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10266 7041K 7683K 78643K 155245 0 pcb 13 20K 24K 78643K 10343 0 rtable 181 16K 18K 78643K 7769 0 ifaddr 87 24K 31K 78643K 2485 0 sysctl 3 1K 5K 78643K 6 0 counters 54 35K 36K 78643K 900 0 ioctlops 0 0K 8K 78643K 9083 0 iov 0 0K 28K 78643K 3336 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1642 103K 103K 78643K 40547 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 262 0 VM map 2 1K 1K 78643K 2 0 sem 18 10K 20K 78643K 344 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 16 57K 97K 78643K 35410 0 sigio 0 0K 0K 78643K 460 0 proc 91 88K 112K 78643K 5777 0 subproc 104 6K 7K 78643K 1852 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 1860 0 in_multi 62 4K 7K 78643K 2389 0 ether_multi 1 0K 0K 78643K 333 0 mrt 1 0K 0K 78643K 738 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 265 1182K 1182K 78643K 265 0 exec 0 0K 2K 78643K 7201 0 pfkey data 0 0K 0K 78643K 8 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 810 2166K 2167K 78643K 441376 0 UVM aobj 131 5K 5K 78643K 153 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 3825 0 NDP 13 0K 1K 78643K 741 0 temp 137 4707K 8803K 78643K 304978 0 kqueue 12 18K 26K 78643K 2118 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 2095 0 2092 30 27 3 3 0 8 2 rtentry 112 2262 0 2193 5 2 3 4 0 8 0 unpcb 136 32189 0 32173 282 279 3 9 0 8 2 syncache 296 104 0 104 31 30 1 1 0 8 1 tcpqe 32 25 0 25 12 11 1 1 0 8 1 tcpcb 736 14072 0 13990 396 388 8 16 0 8 0 arp 120 324 0 312 1 0 1 1 0 8 0 inpcb 304 43670 0 43660 420 411 9 16 0 8 8 rttmr 72 297 0 297 14 13 1 1 0 8 1 nd6 48 500 0 485 1 0 1 1 0 8 0 pkpcb 40 139 0 139 13 13 0 1 0 8 0 kcovpl 48 141 0 133 1 0 1 1 0 8 0 ppxss 1248 161 0 161 39 39 0 1 0 8 0 pfstscr 40 3 0 3 1 1 0 1 0 8 0 pffrag 232 99 0 97 8 7 1 1 0 482 0 pffrnode 88 99 0 97 8 7 1 1 0 8 0 pffrent 40 426 0 424 9 8 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 4 0 4 2 2 0 1 0 8 0 pfrktable 1344 103 0 99 1 0 1 1 0 8 0 pftag 88 42 0 39 2 1 1 1 0 8 0 pfstitem 24 23 0 21 1 0 1 1 0 8 0 pfstkey 112 29 0 27 1 0 1 1 0 8 0 pfstate 320 26 0 24 2 1 1 2 0 8 0 pfrule 1360 225 0 209 5 3 2 2 0 8 0 art_heap8 4096 7 0 6 5 4 1 3 0 8 0 art_heap4 256 14559 0 14235 58 29 29 34 0 8 0 art_table 32 14566 0 14241 5 1 4 5 0 8 0 art_node 16 2221 0 2161 1 0 1 1 0 8 0 sysvmsgpl 40 91 0 83 1 0 1 1 0 8 0 semapl 112 334 0 318 1 0 1 1 0 8 0 shmpl 112 150 0 22 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 48213 0 46675 97 0 97 97 0 8 0 ffsino 272 48213 0 46675 104 0 104 104 0 8 0 nchpl 144 95123 0 93493 63 0 63 63 0 8 0 rtmask 32 8 0 8 2 2 0 1 0 8 0 uvmvnodes 80 7756 0 0 159 0 159 159 0 8 0 vnodes 224 7756 0 0 457 0 457 457 0 8 0 namei 1024 357060 0 357059 17 16 1 2 0 8 0 percpumem 16 462 0 423 1 0 1 1 0 8 0 vcpupl 2048 264 0 0 33 0 33 33 0 8 0 vmpool 560 364 0 100 19 0 19 19 0 8 0 pfiaddrpl 120 34 0 32 1 0 1 1 0 8 0 scsiplug 72 7 0 7 2 2 0 1 0 8 0 scxspl 216 276700 0 276700 57 55 2 8 0 8 2 plimitpl 152 2970 0 2955 1 0 1 1 0 8 0 sigapl 424 35523 0 35478 12 5 7 8 0 8 0 futexpl 64 335272 0 335268 14 13 1 1 0 8 0 knotepl 120 946 0 0 12 3 9 10 0 8 0 kqueuepl 216 9919 0 9909 171 166 5 6 0 8 4 pipepl 336 7521 0 7492 206 198 8 13 0 8 3 fdescpl 496 35441 0 35412 7 3 4 5 0 8 0 filepl 152 268679 0 268425 376 359 17 25 0 8 4 lockfpl 104 10194 0 10192 22 21 1 3 0 8 0 lockfspl 48 2799 0 2797 2 1 1 2 0 8 0 sessionpl 144 163 0 146 1 0 1 1 0 8 0 pgrppl 48 488 0 471 1 0 1 1 0 8 0 ucredpl 96 27649 0 27634 1 0 1 1 0 8 0 zombiepl 144 35478 0 35477 7 6 1 1 0 8 0 processpl 1064 35523 0 35477 5 0 5 5 0 8 0 procpl 672 98436 0 98375 54 47 7 9 0 8 0 srpgc 96 207 0 207 34 33 1 1 0 8 1 sosppl 168 279 0 279 36 36 0 1 0 8 0 sockpl 480 78173 0 78144 1602 1589 13 45 0 8 8 mcl64k 65536 73 0 0 7 4 3 3 0 8 0 mcl16k 16384 25 0 0 4 1 3 3 0 8 0 mcl12k 12288 57 0 0 2 0 2 2 0 8 0 mcl9k 9216 41 0 0 2 1 1 2 0 8 0 mcl8k 8192 49 0 0 5 2 3 3 0 8 0 mcl4k 4096 33 0 0 3 0 3 3 0 8 0 mcl2k2 2112 16 0 0 2 0 2 2 0 8 0 mcl2k 2048 864 0 0 40 18 22 29 0 8 0 mtagpl 96 2689 0 0 45 0 45 45 0 8 0 mbufpl 256 19790 0 0 1169 0 1169 1169 0 8 0 bufpl 288 54152 0 46395 555 0 555 555 0 8 0 anonpl 24 9896078 0 9867112 523 336 187 199 0 186 0 amapchunkpl 152 1067531 0 1066682 165 127 38 50 0 158 1 amappl16 200 91610 0 90243 292 214 78 83 0 8 0 amappl15 192 5687 0 5683 1 0 1 1 0 8 0 amappl14 184 6420 0 6413 2 1 1 1 0 8 0 amappl13 176 3246 0 3242 1 0 1 1 0 8 0 amappl12 168 5379 0 5372 1 0 1 1 0 8 0 amappl11 160 3355 0 3339 1 0 1 1 0 8 0 amappl10 152 4265 0 4253 1 0 1 1 0 8 0 amappl9 144 2446 0 2440 1 0 1 1 0 8 0 amappl8 136 10494 0 10296 8 0 8 8 0 8 0 amappl7 128 7334 0 7317 1 0 1 1 0 8 0 amappl6 120 2570 0 2537 2 0 2 2 0 8 0 amappl5 112 31646 0 31626 1 0 1 1 0 8 0 amappl4 104 9777 0 9743 2 0 2 2 0 8 0 amappl3 96 9164 0 9150 1 0 1 1 0 8 0 amappl2 88 10468 0 10367 4 1 3 3 0 8 0 amappl1 80 638449 0 637889 23 10 13 19 0 8 0 amappl 88 438014 0 437614 13 2 11 11 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 72 152 0 22 3 0 3 3 0 8 0 uaddrrnd 24 35805 0 35512 2 0 2 2 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 35805 0 35512 2 0 2 2 0 8 0 vmmpekpl 168 246487 0 246381 6 0 6 6 0 8 0 vmmpepl 168 3259353 0 3253332 740 457 283 301 0 357 7 vmsppl 368 35804 0 35512 29 2 27 27 0 8 0 rwobjpl 56 769365 0 758818 195 45 150 150 0 8 0 pdppl 4096 71617 0 71288 1565 1232 333 333 0 8 4 pvpl 32 16825511 0 16801796 934 719 215 271 0 265 0 pmappl 248 35804 0 35512 21 2 19 19 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 4304 0 1899 69 0 69 69 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(ffffffff82577da7) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff825ebc34,ffffffff8255f654,568,ffffffff8258dc04) at __assert+0x25 sys/kern/subr_prf.c:161 m_align(fffffd8059388500,ffffffde) at m_align+0x1a0 sys/kern/uipc_mbuf.c:1385 bpf_movein(ffff800028015e20,ffff800000d53e00,ffff800028015b88,ffff800028015a88) at bpf_movein+0x25e sys/net/bpf.c:228 bpfwrite(a1700,ffff800028015e20,1) at bpfwrite+0x169 sys/net/bpf.c:644 spec_write(ffff800028015c80) at spec_write+0xd4 sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd8058845a38,ffff800028015e20,1,fffffd807f7d8540) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd8075adc150,ffff800028015e20,1) at vn_write+0x1a1 sys/kern/vfs_vnops.c:414 dofilewritev(ffff8000246867e8,7,ffff800028015e20,1,ffff800028015f20) at dofilewritev+0x19c sys/kern/sys_generic.c:381 sys_pad_pwrite(ffff8000246867e8,ffff800028015ec8,ffff800028015f20) at sys_pad_pwrite+0x92 sys_pwrite sys/kern/vfs_syscalls.c:3354 [inline] sys_pad_pwrite(ffff8000246867e8,ffff800028015ec8,ffff800028015f20) at sys_pad_pwrite+0x92 sys/kern/vfs_syscalls.c:3426 syscall(ffff800028015f90) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800028015f90) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9187561a5f0, 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