panic: Caught invalid memory access at ffff800001d03b7a size 2 op 0 Stopped at db_enter+0x17: popq %rbp TID PID UID PRFLAGS PFLAGS CPU COMMAND 368629 22796 0 0 0 1 syz-executor *372381 23535 0 0 0x4000000 0K syz-executor db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff8463c64f) at panic+0x270 sys/kern/subr_prf.c:198 __asan_load2_noabort(ffff800001d03b7a) at __asan_load2_noabort+0x107 knote_processfork(ffffffff85d370e0,5012) at knote_processfork+0x603 sys/kern/kern_event.c:2289 fork1(ffffffff85d36d80,f0,ffffffff830a12e0,0,0,ffff80003bbac480) at fork1+0x1225 sys/kern/kern_fork.c:511 kthread_create(ffffffff830a12e0,0,0,ffffffff84b844a0) at kthread_create+0xa8 sys/kern/kern_kthread.c:61 nfs_getset_niothreads(1) at nfs_getset_niothreads+0xe7 sys/nfs/nfs_syscalls.c:702 nfs_sysctl(ffff80003bbac688,1,0,ffff80003bbac660,200000000200,0,ffff80003bbac8e0) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff800045ffc548,ffff80003bbac8e0,ffff80003bbac840) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff80003bbac8e0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bbac8e0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5c5f8d38870, count: 4 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: Caught invalid memory access at ffff800001d03b7a size 2 op 0 ddb{0}> show kasan KASAN: invalid read of 2 bytes at 0xffff800001d03b7a from pc 0xffffffff8302df13 KASAN: first bad byte at 0xffff800001d03b7a (+0); shadow 0xfd: pool use-after-free (or unallocated item) KASAN: 0xffff800001d03b7a is 50 bytes inside the 120-byte item [0xffff800001d03b48..0xffff800001d03bc0) in pool 'knotepl' KASAN: allocated at: #0 pool_get+0x770 sys/kern/subr_pool.c:834 #1 kqueue_register+0x2f2 sys/kern/kern_event.c:1431 #2 sys_kevent+0x409 sys/kern/kern_event.c:1301 #3 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #4 Xsyscall+0x128 KASAN: freed at: #0 pool_put+0x79 sys/kern/subr_pool.c:1019 #1 kqueue_scan+0x1191 sys/kern/kern_event.c:1797 #2 sys_kevent+0x997 sys/kern/kern_event.c:1336 #3 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #4 Xsyscall+0x128 KASAN: pc: knote_processfork+0x603 KASAN: call trace: #0 __asan_load2_noabort+0xe6 kasan_shadow_check sys/kern/subr_kasan.c:-1 [inline] #0 __asan_load2_noabort+0xe6 sys/kern/subr_kasan.c:1097 #1 knote_processfork+0x603 sys/kern/kern_event.c:2289 #2 fork1+0x1225 sys/kern/kern_fork.c:511 #3 kthread_create+0xa8 sys/kern/kern_kthread.c:61 #4 nfs_getset_niothreads+0xe7 sys/nfs/nfs_syscalls.c:702 #5 nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 #6 sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 #7 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #7 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #8 Xsyscall+0x128 KASAN: shadow of 0xffff800001d03a00..0xffff800001d03c80 (1 cell = 8 bytes): 0xffff800001d03a00: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd 0xffff800001d03a80: fd fd fd fd fd fd fd fd fd fd 08 08 08 08 08 08 >0xffff800001d03b00: 08 08 08 08 08 08 08 08 08 fd fd fd fd fd fd[fd] 0xffff800001d03b80: fd fd fd fd fd fd fd fd 08 08 08 08 08 08 08 08 0xffff800001d03c00: 08 08 08 08 08 08 08 fd fd fd fd fd fd fd fd fd KASAN: legend: 00 valid; 01..07 partial; fb malloc redzone; fc malloc freed; fd pool freed; fe kmem; fa global; f1..f4/f8 stack/scope ddb{0}> trace db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff8463c64f) at panic+0x270 sys/kern/subr_prf.c:198 __asan_load2_noabort(ffff800001d03b7a) at __asan_load2_noabort+0x107 knote_processfork(ffffffff85d370e0,5012) at knote_processfork+0x603 sys/kern/kern_event.c:2289 fork1(ffffffff85d36d80,f0,ffffffff830a12e0,0,0,ffff80003bbac480) at fork1+0x1225 sys/kern/kern_fork.c:511 kthread_create(ffffffff830a12e0,0,0,ffffffff84b844a0) at kthread_create+0xa8 sys/kern/kern_kthread.c:61 nfs_getset_niothreads(1) at nfs_getset_niothreads+0xe7 sys/nfs/nfs_syscalls.c:702 nfs_sysctl(ffff80003bbac688,1,0,ffff80003bbac660,200000000200,0,ffff80003bbac8e0) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff800045ffc548,ffff80003bbac8e0,ffff80003bbac840) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff80003bbac8e0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bbac8e0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5c5f8d38870, count: -11 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003bbac030 rbx 0xffff80003bbac0a0 rdx 0 rcx 0xffffffff84f15ff0 cpu_info_full_primary+0x1ff0 rax 0xffff80000016d880 r8 0x101010101010101 r9 0x8080808080808080 r10 0xffff80003bbabe18 r11 0xffffffff8237d880 x86_bus_space_io_read_1 r12 0xffffffff8463c64f .str.26+0x9a28f r13 0xffffffff84f16c10 cpu_info_full_primary+0x2c10 r14 0xffffffff84f16e0f cpu_info_full_primary+0x2e0f r15 0x1 rip 0xffffffff8389f5d7 db_enter+0x17 cs 0x8 rflags 0x246 rsp 0xffff80003bbac030 ss 0x10 db_enter+0x17: popq %rbp ddb{0}> show proc PROC (syz-executor) tid=372381 pid=23535 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=69, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800045ff4550,0xffff800045ffd250 process=0xffff80003ab25360 user=0xffff80003bba1000, vmspace=0xffff800001c8c9a8 estcpu=19, cpticks=25, pctcpu=0.16, user=0, sys=25, intr=0 ddb{0}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 20498 309269 0 0 2 0x14000 0x200 swapper 76043 196105 25206 0 2 0x100002 0 ndp 74285 142758 73868 0 2 0 0 syz-executor 74285 74814 73868 0 3 0 0x4000080 fsleep syz-executor 25206 310108 47522 0 3 0x100002 0x88 sigsusp sh 42853 427019 39898 0 2 0 0 syz-executor 42853 438779 39898 0 3 0 0x4000080 fsleep syz-executor 22796 368629 77843 0 7 0 0 syz-executor 22796 443535 77843 0 3 0 0x4000080 fsleep syz-executor 23535 165916 60907 0 2 0 0 syz-executor 23535 312127 60907 0 3 0 0x4000080 fsleep syz-executor 23535 245630 60907 0 3 0 0x4000080 kqread syz-executor *23535 372381 60907 0 7 0 0x4000000 syz-executor 98811 89325 53075 0 2 0 0 syz-executor 98811 467950 53075 0 3 0 0x4000080 fsleep syz-executor 59261 389759 1424 0 2 0x11 0 syz-executor 59261 66277 1424 0 3 0x11 0x4000080 fsleep syz-executor 46709 354544 44438 0 2 0 0 syz-executor 46709 16666 44438 0 3 0 0x4000080 fsleep syz-executor 46709 456283 44438 0 3 0 0x4000080 fsleep syz-executor 60907 43736 61184 0 2 0x2 0xc80 syz-executor 53075 166609 61184 0 2 0x2 0xc80 syz-executor 47522 297722 61184 0 3 0x2 0x80 wait syz-executor 77843 105949 61184 0 2 0x2 0xc80 syz-executor 39898 365645 61184 0 2 0x2 0xc80 syz-executor 44438 293870 61184 0 2 0x2 0xc80 syz-executor 1424 415540 61184 0 2 0x2 0xc80 syz-executor 73868 457894 61184 0 2 0x2 0xc80 syz-executor 61184 514324 51211 0 3 0x2 0x80 kqread syz-executor 51211 333780 66201 0 3 0x100002 0x88 sigsusp ksh 66201 434706 46737 0 3 0x10 0x88 kqread sshd-session 46737 52796 53315 0 3 0x12 0x80 kqread sshd-session 83621 375288 1 0 3 0x100003 0x80 ttyin getty 53315 92118 1 0 3 0 0x88 kqread sshd 39478 392304 11066 74 3 0x1100012 0x80 bpf pflogd 11066 31997 1 0 3 0 0x80 sbwait pflogd 34513 302994 41723 73 2 0x1100010 0x80 syslogd 41723 80544 1 0 3 0x100002 0x80 sbwait syslogd 80783 59347 1 0 3 0x100000 0x80 kqread resolvd 41079 19096 17544 77 3 0x100012 0x80 kqread dhcpleased 36666 170584 17544 77 3 0x100012 0x80 kqread dhcpleased 17544 33106 1 0 3 0 0x80 kqread dhcpleased 54482 363519 0 0 2 0x14000 0x200 smr 24919 516908 0 0 2 0x14000 0x200 zerothread 71080 244907 0 0 3 0x14000 0x200 aiodoned aiodoned 18693 104349 0 0 3 0x14000 0x200 syncer update 33144 384703 0 0 3 0x14000 0x200 cleaner cleaner 11244 284385 0 0 3 0x14000 0x200 reaper reaper 78754 81380 0 0 3 0x14000 0x200 pgdaemon pagedaemon 88444 456509 0 0 3 0x14000 0x200 bored viomb 47403 20749 0 0 3 0x14000 0x40000200 acpi0 acpi0 25440 114214 0 0 3 0x14000 0x40000200 idle1 91926 360159 0 0 3 0x14000 0x200 bored softnet1 31662 121567 0 0 3 0x14000 0x200 bored softnet0 95970 268036 0 0 3 0x14000 0x200 smrbar systqmp 29015 115421 0 0 3 0x14000 0x200 bored systq 53101 124105 0 0 2 0x14000 0x200 softclockmp 62080 516595 0 0 3 0x14000 0x40000200 tmoslp softclock 58782 256933 0 0 3 0x14000 0x40000200 idle0 1 121011 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{0}> show all locks Process 23535 (syz-executor) thread 0xffff800045ffc548 (372381) exclusive kernel_lock &kernel_lock r = 1 (0xffffffff85cda380) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 sysctl_vslock+0x72 sys/kern/kern_sysctl.c:197 #2 sys_sysctl+0x460 sys/kern/kern_sysctl.c:304 #3 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #4 Xsyscall+0x128 exclusive rwlock sysctllk r = 0 (0xffffffff85073238) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x53e sys/kern/kern_rwlock.c:320 #2 sysctl_vslock+0x37 sys/kern/kern_sysctl.c:192 #3 sys_sysctl+0x460 sys/kern/kern_sysctl.c:304 #4 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #5 Xsyscall+0x128 Process 95970 (systqmp) thread 0xffff800045ffe298 (268036) shared rwlock systqmp r = 0 (0xffffffff853f4d38) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x1ba sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11056 12248K 12250K 166960K 12148 0 pcb 18 24K 24K 166960K 18 0 rtable 235 12K 13K 166960K 345 0 pf 34 22K 22K 166960K 45 0 ifaddr 43 12K 12K 166960K 45 0 ifgroup 55 2K 2K 166960K 55 0 sysctl 1 1K 13K 166960K 5 0 counters 70 42K 42K 166960K 70 0 ioctlops 0 0K 4K 166960K 1485 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1295 83K 83K 166960K 1368 0 UFS quota 1 36K 36K 166960K 1 0 UFS mount 5 44K 44K 166960K 5 0 shm 2 2K 2K 166960K 2 0 VM map 2 1K 1K 166960K 2 0 sem 3 0K 0K 166960K 3 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 292K 166960K 11964 0 file desc 19 69K 93K 166960K 138 0 proc 69 128K 161K 166960K 551 0 subproc 72 9K 9K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 20K 20K 166960K 1 0 in_multi 99 7K 7K 166960K 99 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 1 0 ISOFS mount 1 36K 36K 166960K 1 0 MSDOSFS mount 1 20K 20K 166960K 1 0 ttys 37 263K 263K 166960K 37 0 exec 0 0K 2K 166960K 382 0 fusefs mount 1 36K 36K 166960K 1 0 tdb 3 1K 1K 166960K 3 0 VM swap 14 124K 124K 166960K 15 0 UVM amap 236 249K 262K 166960K 2988 0 UVM aobj 3 4K 4K 166960K 3 0 pinsyscall 1069 1718K 1727K 166960K 1294 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 28 2K 2K 166960K 28 0 temp 35 9162K 9172K 166960K 3894 0 kqueue 17 50K 53K 166960K 30 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 28 0 0 1 0 1 1 0 8 0 rtpcb 120 33 0 29 1 0 1 1 0 8 0 rtentry 176 110 0 1 5 0 5 5 0 8 0 unpcb 144 45 0 27 1 0 1 1 0 8 0 syncache 336 4 0 4 2 1 1 1 0 8 1 tcpcb 736 9 0 4 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 70 0 60 1 0 1 1 0 8 0 nd6 152 23 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 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 pfstitem 24 27 0 0 1 0 1 1 0 8 0 pfstkey 128 27 0 0 1 0 1 1 0 8 0 pfstate 448 27 0 0 3 0 3 3 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 452 0 0 29 0 29 29 0 8 0 art_table 40 453 0 0 5 0 5 5 0 8 0 art_node 32 110 0 10 1 0 1 1 0 8 0 semupl 112 1 0 0 1 0 1 1 0 8 0 semapl 72 1 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1565 0 97 92 0 92 92 0 8 0 ffsino 296 1565 0 97 113 0 113 113 0 8 0 nchpl 144 1766 0 57 64 0 64 64 0 8 0 vnodes 216 1658 0 0 93 0 93 93 0 8 0 namei 1024 6152 0 6152 2 0 2 2 0 8 2 percpumem 16 51 0 0 1 0 1 1 0 8 0 kstatmem 264 27 0 0 2 0 2 2 0 8 0 scxspl 216 6577 0 6577 4 3 1 3 1 8 1 plimitpl 152 30 0 12 1 0 1 1 0 8 0 sigapl 424 456 0 406 7 0 7 7 0 8 0 knotepl 120 140 0 0 5 0 5 5 0 8 0 kqueuepl 224 27 0 14 1 0 1 1 0 8 0 pipepl 344 126 0 99 3 0 3 3 0 8 0 fdescpl 528 439 0 406 3 0 3 3 0 8 0 filepl 160 1595 0 1365 10 0 10 10 0 8 0 lockfpl 104 12 0 6 1 0 1 1 0 8 0 lockfspl 48 6 0 2 1 0 1 1 0 8 0 sessionpl 144 25 0 15 1 0 1 1 0 8 0 pgrppl 48 33 0 15 1 0 1 1 0 8 0 ucredpl 104 92 0 78 1 0 1 1 0 8 0 zombiepl 144 406 0 406 1 0 1 1 0 8 1 processpl 1232 456 0 406 5 0 5 5 0 8 0 procpl 664 467 0 407 5 0 5 5 0 8 0 sockpl 752 148 0 116 4 0 4 4 0 8 0 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 115 0 0 15 0 15 15 0 8 0 mcl2k 2048 19 0 0 3 0 3 3 0 8 0 mextrefs 64 18 0 0 1 0 1 1 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 242 0 0 16 0 16 16 0 8 0 bufpl 272 2318 0 106 148 0 148 148 0 8 0 anonpl 32 3829 0 0 31 0 31 31 0 222 0 amapchunkpl 152 8177 0 7681 20 0 20 20 0 158 0 amappl16 200 1843 0 1828 5 1 4 5 0 8 3 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 430 0 428 1 0 1 1 0 8 0 amappl13 176 154 0 141 1 0 1 1 0 8 0 amappl12 168 758 0 726 2 0 2 2 0 8 0 amappl11 160 19 0 19 2 2 0 1 0 8 0 amappl10 152 69 0 54 1 0 1 1 0 8 0 amappl9 144 276 0 276 1 1 0 1 0 8 0 amappl8 136 107 0 106 1 0 1 1 0 8 0 amappl7 128 144 0 130 1 0 1 1 0 8 0 amappl6 120 175 0 173 1 0 1 1 0 8 0 amappl5 112 101 0 91 1 0 1 1 0 8 0 amappl4 104 305 0 287 1 0 1 1 0 8 0 amappl3 96 1434 0 1332 4 1 3 4 0 8 0 amappl2 88 555 0 476 2 0 2 2 0 8 0 amappl1 80 10386 0 9755 16 0 16 16 0 8 1 amappl 88 2269 0 2109 4 0 4 4 0 92 0 uvmvnodes 80 98 0 0 2 0 2 2 0 8 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 439 0 406 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 439 0 406 1 0 1 1 0 8 0 vmmpekpl 168 5695 0 5663 2 0 2 2 0 8 0 vmmpepl 168 38113 0 36138 88 0 88 88 0 357 2 vmsppl 488 438 0 406 5 0 5 5 0 8 0 rwobjpl 80 14519 0 13468 26 1 25 25 0 8 1 pdppl 4096 886 0 812 96 10 86 86 0 8 12 pvpl 32 10149 0 0 83 1 82 82 0 265 0 pmappl 256 438 0 406 3 0 3 3 0 8 0 extentpl 40 47 0 29 1 0 1 1 0 8 0 phpool 120 421 0 14 13 0 13 13 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff8463c64f) at panic+0x270 sys/kern/subr_prf.c:198 __asan_load2_noabort(ffff800001d03b7a) at __asan_load2_noabort+0x107 knote_processfork(ffffffff85d370e0,5012) at knote_processfork+0x603 sys/kern/kern_event.c:2289 fork1(ffffffff85d36d80,f0,ffffffff830a12e0,0,0,ffff80003bbac480) at fork1+0x1225 sys/kern/kern_fork.c:511 kthread_create(ffffffff830a12e0,0,0,ffffffff84b844a0) at kthread_create+0xa8 sys/kern/kern_kthread.c:61 nfs_getset_niothreads(1) at nfs_getset_niothreads+0xe7 sys/nfs/nfs_syscalls.c:702 nfs_sysctl(ffff80003bbac688,1,0,ffff80003bbac660,200000000200,0,ffff80003bbac8e0) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff800045ffc548,ffff80003bbac8e0,ffff80003bbac840) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff80003bbac8e0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bbac8e0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5c5f8d38870, count: -11 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x19: leave x86_ipi_db(ffff800028fe3ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412 x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff85cd9b80) at __mp_lock+0x286 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85cd9b80) at __mp_lock+0x286 sys/kern/kern_lock.c:173 uvn_io(ffff80000192aaf8,ffff80003b74c5e0,1,202,0) at uvn_io+0x526 sys/uvm/uvm_vnode.c:1224 uvn_get(ffff80000192aaf8,5f2000,ffff80003b74c720,ffff80003b74c740,0,2,73ba2,ffffffff84c71d80) at uvn_get+0x494 sys/uvm/uvm_vnode.c:1075 uvm_fault_lower_io(ffff80003b74c920,ffff80003b74c8c8,ffff80003b74c828,ffff80003b74c818) at uvm_fault_lower_io+0x5cd sys/uvm/uvm_fault.c:1612 uvm_fault_lower(ffff80003b74c920,ffff80003b74c8c8,ffff80003b74ca20) at uvm_fault_lower+0x34e sys/uvm/uvm_fault.c:1381 uvm_fault(ffff800001c8c208,1b2e516000,0,2) at uvm_fault+0x3ef sys/uvm/uvm_fault.c:657 upageflttrap(ffff80003b74cc00,1b2e516ff8) at upageflttrap+0xe0 sys/arch/amd64/amd64/trap.c:194 usertrap(ffff80003b74cc00) at usertrap+0x4f9 sys/arch/amd64/amd64/trap.c:648 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7cc807f7f550, count: 3 ddb{1}> trace x86_ipi_db(ffff800028fe3ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412 x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff85cd9b80) at __mp_lock+0x286 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85cd9b80) at __mp_lock+0x286 sys/kern/kern_lock.c:173 uvn_io(ffff80000192aaf8,ffff80003b74c5e0,1,202,0) at uvn_io+0x526 sys/uvm/uvm_vnode.c:1224 uvn_get(ffff80000192aaf8,5f2000,ffff80003b74c720,ffff80003b74c740,0,2,73ba2,ffffffff84c71d80) at uvn_get+0x494 sys/uvm/uvm_vnode.c:1075 uvm_fault_lower_io(ffff80003b74c920,ffff80003b74c8c8,ffff80003b74c828,ffff80003b74c818) at uvm_fault_lower_io+0x5cd sys/uvm/uvm_fault.c:1612 uvm_fault_lower(ffff80003b74c920,ffff80003b74c8c8,ffff80003b74ca20) at uvm_fault_lower+0x34e sys/uvm/uvm_fault.c:1381 uvm_fault(ffff800001c8c208,1b2e516000,0,2) at uvm_fault+0x3ef sys/uvm/uvm_fault.c:657 upageflttrap(ffff80003b74cc00,1b2e516ff8) at upageflttrap+0xe0 sys/arch/amd64/amd64/trap.c:194 usertrap(ffff80003b74cc00) at usertrap+0x4f9 sys/arch/amd64/amd64/trap.c:648 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7cc807f7f550, count: -12