*cpu0: uvm_fault(0xfffff8806ced7208, 0x98, 0, 1) -> e ddb{1}> show kasan No such command ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0xf9e7f980870, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002eb8be90 rbx 0 rdx 0xffff80000002a740 rcx 0xffff800032792d18 rax 0x3c r8 0xffff80002eb8bdc0 r9 0x1 r10 0xcc5335aae98a1522 r11 0xe0226136ebbf4c2b r12 0 r13 0 r14 0xffff800032792d18 r15 0 rip 0xffffffff821793ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002eb8be10 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=383885 pid=29821 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800032792020,0xffff8000327927f8 process=0xffff80002a37e1c8 user=0xffff80002eb86000, vmspace=0xfffff8806ced7d78 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 37591 516492 90196 0 3 0x2 0 clonelk ifconfig 90196 103894 16401 0 3 0x100002 0x88 sigsusp sh 29821 122429 63346 0 2 0 0 syz-executor *29821 383885 63346 0 7 0 0x4000000 syz-executor 62429 306504 79304 0 2 0 0 syz-executor 62429 47761 79304 0 7 0 0x4000000 syz-executor 9834 8960 39072 0 2 0x1 0 syz-executor 9834 156341 39072 0 3 0x1 0x4000080 fsleep syz-executor 9834 395578 39072 0 3 0x1 0x4000080 fsleep syz-executor 16401 445696 21643 0 3 0x2 0x80 wait syz-executor 79304 322869 21643 0 3 0x2 0x80 nanoslp syz-executor 39072 371066 21643 0 3 0x2 0x80 nanoslp syz-executor 92458 506550 21643 0 3 0x2 0x80 piperd syz-executor 35154 71167 21643 0 3 0x2 0x80 piperd syz-executor 56934 249988 21643 0 3 0x2 0x80 nanoslp syz-executor 63346 277604 21643 0 2 0x2 0xc80 syz-executor 21643 384620 60655 0 3 0x2 0x80 wait syz-executor 60655 274994 71598 0 3 0x100002 0x88 sigsusp ksh 71598 26717 64319 0 3 0x10 0x88 kqread sshd-session 64319 447872 1107 0 3 0x12 0x80 kqread sshd-session 23310 30266 1 0 3 0x100003 0x80 ttyin getty 1107 481057 1 0 3 0 0x88 kqread sshd 65879 329059 22251 74 3 0x1100012 0x80 bpf pflogd 22251 97388 1 0 3 0 0x80 sbwait pflogd 8146 120676 20880 73 3 0x1100010 0x80 kqread syslogd 20880 228822 1 0 3 0x100002 0x80 sbwait syslogd 32688 507831 1 0 3 0x100000 0x80 kqread resolvd 3257 461562 19216 77 3 0x100012 0x80 kqread dhcpleased 51668 448300 19216 77 3 0x100012 0x80 kqread dhcpleased 19216 107120 1 0 3 0 0x80 kqread dhcpleased 63263 166325 0 0 3 0x14000 0x200 bored smr 77409 497977 0 0 2 0x14000 0x200 zerothread 33628 126262 0 0 3 0x14000 0x200 aiodoned aiodoned 576 20360 0 0 3 0x14000 0x200 syncer update 1633 114231 0 0 3 0x14000 0x200 cleaner cleaner 83689 386427 0 0 3 0x14000 0x200 reaper reaper 19038 278043 0 0 3 0x14000 0x200 pgdaemon pagedaemon 40537 491064 0 0 3 0x14000 0x200 bored viomb 36875 222799 0 0 3 0x14000 0x40000200 acpi0 acpi0 11472 486802 0 0 3 0x14000 0x40000200 idle1 61892 475079 0 0 3 0x14000 0x200 bored softnet1 23533 473188 0 0 3 0x14000 0x200 bored softnet0 55037 131673 0 0 3 0x14000 0x200 smrbar systqmp 16190 443715 0 0 3 0x14000 0x200 bored systq 78355 464259 0 0 3 0x14000 0x200 tmoslp softclockmp 37636 408339 0 0 3 0x14000 0x40000200 tmoslp softclock 61484 382258 0 0 3 0x14000 0x40000200 idle0 1 423533 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &sched_lock r = 0 (0xffffffff839ef3a8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487 #2 preempt+0x35 sys/kern/sched_bsd.c:338 #3 ast+0x15c mi_ast sys/sys/syscall_mi.h:252 [inline] #3 ast+0x15c sys/arch/amd64/amd64/trap.c:747 #4 Xsyscall+0x156 Process 62429 (syz-executor) thread 0xffff800032793a10 (47761) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83ad3e40) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] #1 syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 #2 Xsyscall+0x128 Process 55037 (systqmp) thread 0xffff800045ffe298 (131673) shared rwlock systqmp r = 0 (0xffffffff838e3108) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11064 12215K 12217K 166960K 12173 0 pcb 17 12K 12K 166960K 18 0 rtable 216 6K 7K 166960K 354 0 pf 35 17K 18K 166960K 48 0 ifaddr 40 6K 7K 166960K 46 0 ifgroup 53 2K 2K 166960K 57 0 sysctl 1 1K 9K 166960K 5 0 counters 70 37K 37K 166960K 72 0 ioctlops 0 0K 4K 166960K 1487 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1292 81K 81K 166960K 1388 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 1K 166960K 2 0 VM map 2 1K 1K 166960K 2 0 sem 2 0K 0K 166960K 2 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 16 57K 93K 166960K 155 0 proc 77 131K 164K 166960K 559 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 2 0 in_multi 88 5K 6K 166960K 99 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 49 228K 228K 166960K 49 0 exec 0 0K 1K 166960K 391 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 217 176K 186K 166960K 3206 0 UVM aobj 3 2K 2K 166960K 3 0 pinsyscall 41 82K 108K 166960K 1315 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 26 1K 2K 166960K 29 0 temp 33 9114K 9120K 166960K 3933 0 kqueue 14 22K 22K 166960K 28 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> 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 34 0 31 1 0 1 1 0 8 0 rtentry 176 111 0 12 5 0 5 5 0 8 0 unpcb 144 47 0 30 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 11 0 7 1 0 1 1 0 8 0 arp 136 18 0 2 1 0 1 1 0 8 0 inpcb 328 82 0 74 1 0 1 1 0 8 0 nd6 152 24 0 3 1 0 1 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1192 1 0 0 1 0 1 1 0 8 0 pfstscr 40 2 0 0 1 0 1 1 0 8 0 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 2 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 pfrktable 1344 1 0 1 1 0 1 1 0 8 1 pfstitem 24 19 0 0 1 0 1 1 0 8 0 pfstkey 128 19 0 0 1 0 1 1 0 8 0 pfstate 448 18 0 0 2 0 2 2 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 256 453 0 44 29 0 29 29 0 8 2 art_table 40 454 0 44 5 0 5 5 0 8 0 art_node 32 111 0 12 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1597 0 127 93 0 93 93 0 8 0 ffsino 296 1597 0 127 114 0 114 114 0 8 0 nchpl 144 1811 0 108 64 0 64 64 0 8 0 vnodes 216 1706 0 0 95 0 95 95 0 8 0 namei 1024 5575 0 5575 2 0 2 2 0 8 2 percpumem 16 52 0 1 1 0 1 1 0 8 0 kstatmem 264 29 0 2 2 0 2 2 0 8 0 scxspl 216 6279 0 6279 4 3 1 3 1 8 1 plimitpl 152 34 0 14 1 0 1 1 0 8 0 sigapl 424 470 0 424 7 0 7 7 0 8 1 knotepl 120 53 0 0 2 0 2 2 0 8 0 kqueuepl 224 24 0 14 1 0 1 1 0 8 0 pipepl 344 129 0 102 3 0 3 3 0 8 0 fdescpl 528 454 0 424 3 0 3 3 0 8 0 filepl 160 1661 0 1442 10 0 10 10 0 8 0 lockfpl 104 14 0 12 1 0 1 1 0 8 0 lockfspl 48 8 0 6 1 0 1 1 0 8 0 sessionpl 144 26 0 16 1 0 1 1 0 8 0 pgrppl 48 35 0 17 1 0 1 1 0 8 0 ucredpl 104 95 0 82 1 0 1 1 0 8 0 zombiepl 144 426 0 424 1 0 1 1 0 8 0 processpl 1232 470 0 424 5 0 5 5 0 8 1 procpl 664 502 0 452 5 0 5 5 0 8 0 sockpl 752 163 0 135 4 0 4 4 0 8 1 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 117 0 0 15 0 15 15 0 8 0 mcl2k 2048 24 0 0 3 0 3 3 0 8 0 mextrefs 64 20 0 0 1 0 1 1 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 125 0 0 8 0 8 8 0 8 0 bufpl 272 2312 0 105 148 0 148 148 0 8 0 anonpl 32 3785 0 0 31 0 31 31 0 247 0 amapchunkpl 152 8718 0 8296 19 0 19 19 0 158 2 amappl16 200 1736 0 1721 5 0 5 5 0 8 4 amappl15 192 8 0 8 1 0 1 1 0 8 1 amappl14 184 429 0 427 1 0 1 1 0 8 0 amappl13 176 124 0 112 1 0 1 1 0 8 0 amappl12 168 703 0 675 2 0 2 2 0 8 0 amappl11 160 9 0 9 1 0 1 1 0 8 1 amappl10 152 63 0 49 1 0 1 1 0 8 0 amappl9 144 276 0 276 1 0 1 1 0 8 1 amappl8 136 100 0 96 1 0 1 1 0 8 0 amappl7 128 144 0 131 1 0 1 1 0 8 0 amappl6 120 157 0 154 1 0 1 1 0 8 0 amappl5 112 95 0 85 1 0 1 1 0 8 0 amappl4 104 295 0 276 1 0 1 1 0 8 0 amappl3 96 1509 0 1425 3 0 3 3 0 8 0 amappl2 88 565 0 491 2 0 2 2 0 8 0 amappl1 80 10451 0 9852 15 0 15 15 0 8 1 amappl 88 2479 0 2336 4 0 4 4 0 92 0 uvmvnodes 80 99 0 0 3 0 3 3 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 24 454 0 424 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 454 0 424 1 0 1 1 0 8 0 vmmpekpl 168 5812 0 5770 2 0 2 2 0 8 0 vmmpepl 168 38287 0 36526 88 0 88 88 0 357 8 vmsppl 488 453 0 424 5 0 5 5 0 8 1 rwobjpl 80 14587 0 13582 25 0 25 25 0 8 2 pdppl 4096 915 0 848 97 12 85 85 0 8 18 pvpl 32 9380 0 0 76 0 76 76 0 265 0 pmappl 256 453 0 424 3 0 3 3 0 8 1 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 414 0 15 12 0 12 12 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83965ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 x86_bus_space_io_write_1(3f8,0,6c) at x86_bus_space_io_write_1+0x40 sys/arch/amd64/amd64/bus_space.c:790 comcnputc(800,6c) at comcnputc+0x1ab bus_space_barrier sys/dev/ic/com.c:-1 [inline] comcnputc(800,6c) at comcnputc+0x1ab sys/dev/ic/com.c:1268 cnputc(6c) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(6c) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff834b11cb) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff8000367cf870) at db_ktrap+0x1b6 db_printtrap sys/arch/amd64/amd64/db_interface.c:103 [inline] db_ktrap(6,0,ffff8000367cf870) at db_ktrap+0x1b6 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff8000367cf870) at kerntrap+0x243 sys/arch/amd64/amd64/trap.c:519 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff800032793a10,fffff8807ce2c0e8,ffff8000367cfa50) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691 sys_futimes(ffff800032793a10,ffff8000367cfba0,ffff8000367cfaf0) at sys_futimes+0x208 sys/kern/vfs_syscalls.c:2733 end trace frame: 0xffff8000367cfb90, count: 0 ddb{0}> trace x86_ipi_db(ffffffff83965ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 x86_bus_space_io_write_1(3f8,0,6c) at x86_bus_space_io_write_1+0x40 sys/arch/amd64/amd64/bus_space.c:790 comcnputc(800,6c) at comcnputc+0x1ab bus_space_barrier sys/dev/ic/com.c:-1 [inline] comcnputc(800,6c) at comcnputc+0x1ab sys/dev/ic/com.c:1268 cnputc(6c) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(6c) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff834b11cb) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff8000367cf870) at db_ktrap+0x1b6 db_printtrap sys/arch/amd64/amd64/db_interface.c:103 [inline] db_ktrap(6,0,ffff8000367cf870) at db_ktrap+0x1b6 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff8000367cf870) at kerntrap+0x243 sys/arch/amd64/amd64/trap.c:519 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff800032793a10,fffff8807ce2c0e8,ffff8000367cfa50) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691 sys_futimes(ffff800032793a10,ffff8000367cfba0,ffff8000367cfaf0) at sys_futimes+0x208 sys/kern/vfs_syscalls.c:2733 syscall(ffff8000367cfba0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000367cfba0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x366561f5140, count: -16 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0xf9e7f980870, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0xf9e7f980870, count: -1