*cpu0: uvm_fault(0xfffff6806ceffb88, 0x98, 0, 1) -> e ddb{1}> show kasan No such command ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7c3c1a228ea0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff800036791b50 rbx 0 rdx 0 rcx 0xffff800045fee2b0 rax 0x3b r8 0xffff800036791a80 r9 0 r10 0x2a306675e723bdf4 r11 0xbb64a92ead14f82d r12 0 r13 0 r14 0xffff800045fee2b0 r15 0 rip 0xffffffff815e33ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff800036791ad0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=266095 pid=72895 tcnt=2 stat=onproc flags process=0 proc=0 runpri=50, usrpri=50, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003afba2b8,0xffff800045feed20 process=0xffff80003afb5360 user=0xffff80003678c000, vmspace=0xfffff6806ceff200 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 19443 183737 45492 0 2 0 0 syz-executor *72895 266095 78303 0 7 0 0 syz-executor 72895 311149 78303 0 3 0 0x4000080 fsleep syz-executor 79626 302026 68652 0 2 0 0 syz-executor 79626 406273 68652 0 3 0 0x4000080 kqpoll syz-executor 79626 404066 68652 0 3 0 0x4000080 kqpoll syz-executor 5718 428525 96316 0 2 0 0 syz-executor 13560 358115 30631 0 2 0 0 syz-executor 13560 416636 30631 0 3 0 0x4000080 fsleep syz-executor 13560 134063 30631 0 3 0 0x4000080 fsleep syz-executor 24253 194964 68682 0 2 0 0 syz-executor 24253 33556 68682 0 7 0 0x4000000 syz-executor 24253 353759 68682 0 3 0 0x4000080 fsleep syz-executor 36834 289043 11195 0 2 0 0 syz-executor 36834 281914 11195 0 3 0 0x4000080 fsleep syz-executor 36834 74090 11195 0 3 0 0x4000080 fsleep syz-executor 13092 436534 75236 0 3 0 0x80 nanoslp syz-executor 13092 365720 75236 0 3 0 0x4000080 kqsel syz-executor 13092 393080 75236 0 3 0 0x4000080 kqsel syz-executor 68652 47283 83317 0 3 0x2 0x80 nanoslp syz-executor 78303 42200 83317 0 3 0x2 0x80 nanoslp syz-executor 96316 422815 83317 0 3 0x2 0x80 nanoslp syz-executor 45492 207272 83317 0 3 0x2 0x80 nanoslp syz-executor 75236 463127 83317 0 2 0x2 0 syz-executor 30631 428599 83317 0 3 0x2 0x80 nanoslp syz-executor 11195 27900 83317 0 3 0x2 0x80 nanoslp syz-executor 68682 434552 83317 0 3 0x2 0x80 nanoslp syz-executor 83317 155397 59783 0 3 0x2 0x80 kqread syz-executor 59783 139866 98405 0 3 0x100002 0x88 sigsusp ksh 98405 293974 72352 0 3 0x10 0x88 kqread sshd-session 72352 161419 32606 0 3 0x12 0x80 kqread sshd-session 1318 513262 1 0 3 0x100003 0x80 ttyin getty 32606 185950 1 0 3 0 0x88 kqread sshd 68333 202671 44946 74 3 0x1100012 0x80 bpf pflogd 44946 222930 1 0 3 0 0x80 sbwait pflogd 57405 47181 8985 73 3 0x1100010 0x80 kqread syslogd 8985 148595 1 0 3 0x100002 0x80 sbwait syslogd 60569 224232 1 0 3 0x100000 0x80 kqread resolvd 17690 321376 13082 77 3 0x100012 0x80 kqread dhcpleased 68572 211240 13082 77 3 0x100012 0x80 kqread dhcpleased 13082 229138 1 0 3 0 0x80 kqread dhcpleased 84886 268868 0 0 3 0x14000 0x200 bored smr 15705 1207 0 0 2 0x14000 0x200 zerothread 58683 49949 0 0 3 0x14000 0x200 aiodoned aiodoned 63485 215024 0 0 3 0x14000 0x200 syncer update 52404 249220 0 0 3 0x14000 0x200 cleaner cleaner 60716 33146 0 0 3 0x14000 0x200 reaper reaper 54786 37216 0 0 3 0x14000 0x200 pgdaemon pagedaemon 82064 509191 0 0 3 0x14000 0x200 bored viomb 56669 54396 0 0 3 0x14000 0x40000200 acpi0 acpi0 56509 501170 0 0 3 0x14000 0x40000200 idle1 907 385650 0 0 3 0x14000 0x200 bored softnet1 2840 223612 0 0 3 0x14000 0x200 bored softnet0 3091 358272 0 0 3 0x14000 0x200 bored systqmp 37242 342576 0 0 3 0x14000 0x200 bored systq 90035 369483 0 0 3 0x14000 0x200 tmoslp softclockmp 60348 236208 0 0 3 0x14000 0x40000200 tmoslp softclock 15445 486328 0 0 3 0x14000 0x40000200 idle0 1 383301 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 &pmap->pm_mtx r = 0 (0xfffff6806b3bab10) #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 pmap_write_protect+0x80 rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline] #2 pmap_write_protect+0x80 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:441 [inline] #2 pmap_write_protect+0x80 sys/arch/amd64/amd64/pmap.c:2173 #3 uvm_map_protect+0xb95 pmap_protect sys/arch/amd64/compile/SYZKALLER/obj/machine/pmap.h:481 [inline] #3 uvm_map_protect+0xb95 sys/uvm/uvm_map.c:3202 #4 sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #6 Xsyscall+0x128 Process 72895 (syz-executor) thread 0xffff800045fee2b0 (266095) exclusive rwlock uobjlk r = 0 (0xfffff6806df6d460) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 uvm_map_protect+0xb36 sys/uvm/uvm_map.c:3202 #3 sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590 #4 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #5 Xsyscall+0x128 exclusive rwlock vmmaplk r = 0 (0xfffff6806ceff300) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5170 #3 uvm_map_protect+0xe0 sys/uvm/uvm_map.c:3075 #4 sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #6 Xsyscall+0x128 exclusive mutex &pmap->pm_mtx r = 0 (0xfffff6806b3bab10) #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 pmap_write_protect+0x80 rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline] #2 pmap_write_protect+0x80 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:441 [inline] #2 pmap_write_protect+0x80 sys/arch/amd64/amd64/pmap.c:2173 #3 uvm_map_protect+0xb95 pmap_protect sys/arch/amd64/compile/SYZKALLER/obj/machine/pmap.h:481 [inline] #3 uvm_map_protect+0xb95 sys/uvm/uvm_map.c:3202 #4 sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #6 Xsyscall+0x128 Process 24253 (syz-executor) thread 0xffff80003afbaa80 (33556) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83b2de00) #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11060 12090K 12149K 166960K 12160 0 pcb 18 12K 12K 166960K 31 0 rtable 237 6K 7K 166960K 357 0 pf 36 18K 24K 166960K 54 0 ifaddr 43 7K 7K 166960K 45 0 ifgroup 58 2K 2K 166960K 58 0 sysctl 2 1K 9K 166960K 6 0 counters 70 37K 37K 166960K 70 0 ioctlops 0 0K 4K 166960K 1491 0 iov 0 0K 16K 166960K 4 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1290 81K 81K 166960K 1375 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 3 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 18 65K 89K 166960K 162 0 proc 70 115K 180K 166960K 555 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 15 0 in_multi 99 6K 6K 166960K 101 0 ether_multi 1 0K 0K 166960K 4 0 mrt 0 0K 0K 166960K 5 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 37 175K 175K 166960K 37 0 exec 0 0K 1K 166960K 388 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 233 159K 168K 166960K 3310 0 UVM aobj 4 2K 2K 166960K 4 0 pinsyscall 43 86K 101K 166960K 1318 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 2 0 NDP 18 0K 1K 166960K 28 0 temp 38 9118K 9134K 166960K 4535 0 kqueue 13 20K 22K 166960K 29 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 33 0 30 1 0 1 1 0 8 0 rtentry 176 114 0 4 5 0 5 5 0 8 0 unpcb 144 52 0 35 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 13 0 9 1 0 1 1 0 8 0 arp 136 19 0 1 1 0 1 1 0 8 0 inpcb 328 94 0 86 2 0 2 2 0 8 1 nd6 152 24 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 pfanchor 1288 3 0 0 1 0 1 1 0 8 0 pfstitem 24 23 0 0 1 0 1 1 0 8 0 pfstkey 128 23 0 0 1 0 1 1 0 8 0 pfstate 448 22 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 256 459 0 2 29 0 29 29 0 8 0 art_table 40 460 0 2 5 0 5 5 0 8 0 art_node 32 114 0 14 1 0 1 1 0 8 0 shmpl 112 1 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1605 0 136 93 0 93 93 0 8 0 ffsino 296 1605 0 136 114 0 114 114 0 8 0 nchpl 144 1836 0 132 64 0 64 64 0 8 0 vnodes 216 1704 0 0 95 0 95 95 0 8 0 namei 1024 5605 0 5605 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 6339 0 6339 4 3 1 3 1 8 1 plimitpl 152 30 0 13 1 0 1 1 0 8 0 sigapl 424 479 0 431 7 0 7 7 0 8 0 knotepl 120 52 0 0 2 0 2 2 0 8 0 kqueuepl 224 34 0 21 1 0 1 1 0 8 0 pipepl 344 126 0 99 3 0 3 3 0 8 0 fdescpl 528 463 0 431 3 0 3 3 0 8 0 filepl 160 1693 0 1479 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 25 0 16 1 0 1 1 0 8 0 pgrppl 48 33 0 16 1 0 1 1 0 8 0 ucredpl 104 101 0 88 1 0 1 1 0 8 0 zombiepl 144 431 0 431 1 0 1 1 0 8 1 processpl 1232 479 0 431 5 0 5 5 0 8 0 procpl 664 523 0 464 5 0 5 5 0 8 0 sockpl 752 180 0 152 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 12 0 0 2 0 2 2 0 8 0 mextrefs 64 8 0 0 1 0 1 1 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 155 0 0 10 0 10 10 0 8 0 bufpl 272 2337 0 105 149 0 149 149 0 8 0 anonpl 32 7469 0 0 61 0 61 61 0 247 0 amapchunkpl 152 9130 0 8640 20 0 20 20 0 158 0 amappl16 200 2188 0 2171 15 1 14 14 0 8 12 amappl15 192 97 0 97 1 1 0 1 0 8 0 amappl14 184 435 0 434 1 0 1 1 0 8 0 amappl13 176 128 0 116 1 0 1 1 0 8 0 amappl12 168 711 0 679 2 0 2 2 0 8 0 amappl11 160 4 0 4 1 1 0 1 0 8 0 amappl10 152 61 0 47 1 0 1 1 0 8 0 amappl9 144 291 0 291 1 1 0 1 0 8 0 amappl8 136 147 0 145 1 0 1 1 0 8 0 amappl7 128 149 0 136 1 0 1 1 0 8 0 amappl6 120 166 0 165 1 0 1 1 0 8 0 amappl5 112 102 0 90 1 0 1 1 0 8 0 amappl4 104 312 0 292 1 0 1 1 0 8 0 amappl3 96 1556 0 1461 4 1 3 3 0 8 0 amappl2 88 594 0 515 2 0 2 2 0 8 0 amappl1 80 10511 0 9900 15 0 15 15 0 8 0 amappl 88 2582 0 2420 4 0 4 4 0 92 0 uvmvnodes 80 100 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 463 0 431 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 463 0 431 1 0 1 1 0 8 0 vmmpekpl 168 5821 0 5789 2 0 2 2 0 8 0 vmmpepl 168 39711 0 37776 97 0 97 97 0 357 8 vmsppl 488 462 0 431 5 0 5 5 0 8 0 rwobjpl 80 15145 0 14121 28 0 28 28 0 8 2 pdppl 4096 933 0 862 93 16 77 83 0 8 6 pvpl 32 14174 0 0 116 0 116 116 0 265 1 pmappl 256 462 0 431 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 412 0 19 12 0 12 12 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff839afff0) 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_read_1(3f8,5) at x86_bus_space_io_read_1+0x37 sys/arch/amd64/amd64/bus_space.c:670 comcnputc(800,66) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1671 [inline] comcnputc(800,66) at comcnputc+0x250 sys/dev/ic/com.c:1274 cnputc(66) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(66) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff834b0fd8) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80003c3f1b80) at db_ktrap+0x1b6 db_printtrap sys/arch/amd64/amd64/db_interface.c:103 [inline] db_ktrap(6,0,ffff80003c3f1b80) at db_ktrap+0x1b6 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80003c3f1b80) at kerntrap+0x243 sys/arch/amd64/amd64/trap.c:519 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff80003afbaa80,fffff68068186888,ffff80003c3f1d40) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691 sys_futimens(ffff80003afbaa80,ffff80003c3f1e90,ffff80003c3f1de0) at sys_futimens+0xb3 sys/kern/vfs_syscalls.c:2767 end trace frame: 0xffff80003c3f1e80, count: 0 ddb{0}> trace x86_ipi_db(ffffffff839afff0) 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_read_1(3f8,5) at x86_bus_space_io_read_1+0x37 sys/arch/amd64/amd64/bus_space.c:670 comcnputc(800,66) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1671 [inline] comcnputc(800,66) at comcnputc+0x250 sys/dev/ic/com.c:1274 cnputc(66) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(66) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff834b0fd8) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80003c3f1b80) at db_ktrap+0x1b6 db_printtrap sys/arch/amd64/amd64/db_interface.c:103 [inline] db_ktrap(6,0,ffff80003c3f1b80) at db_ktrap+0x1b6 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80003c3f1b80) at kerntrap+0x243 sys/arch/amd64/amd64/trap.c:519 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff80003afbaa80,fffff68068186888,ffff80003c3f1d40) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691 sys_futimens(ffff80003afbaa80,ffff80003c3f1e90,ffff80003c3f1de0) at sys_futimens+0xb3 sys/kern/vfs_syscalls.c:2767 syscall(ffff80003c3f1e90) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3f1e90) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x189eee98ab0, 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: 0x7c3c1a228ea0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7c3c1a228ea0, count: -1