*cpu0: uvm_fault(0xfffff9806cd56d78, 0x98, 0, 1) -> e ddb{1}> show kasan No such command ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7f3df7508f70, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c3cfd70 rbx 0 rdx 0 rcx 0xffff80003c3e22c0 rax 0x3a r8 0xffff80003c3cfca0 r9 0 r10 0xc0c7a3095e58afe2 r11 0x57a7d1cb4cb1d984 r12 0 r13 0 r14 0xffff80003c3e22c0 r15 0 rip 0xffffffff831453ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80003c3cfcf0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=176164 pid=38257 tcnt=2 stat=onproc flags process=10 proc=0 runpri=36, usrpri=50, slppri=36, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c3e2a88,0xffff80003c3e2fc8 process=0xffff80003c3c26a0 user=0xffff80003c3ca000, vmspace=0xfffff9806cd565d8 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 37388 505043 5844 0 2 0 0 syz-executor *38257 176164 97415 60929 7 0x10 0 syz-executor 38257 127325 97415 60929 2 0x10 0x4000080 syz-executor 42324 483506 82578 0 2 0 0 syz-executor 42324 53968 82578 0 3 0 0x4000080 fsleep syz-executor 47208 476426 65285 0 2 0 0 syz-executor 47208 277332 65285 0 7 0 0x4000000 syz-executor 48248 225449 96138 0 2 0 0xc80 syz-executor 48248 370453 96138 0 3 0 0x4000080 bell syz-executor 48248 494665 96138 0 3 0 0x4000080 fsleep syz-executor 32141 471476 52740 0 2 0 0xc80 syz-executor 32141 34716 52740 0 3 0 0x4000080 kqread syz-executor 32141 476972 52740 0 3 0 0x4000080 fsleep syz-executor 15009 161914 35151 -1 3 0x10 0x80 nanoslp syz-executor 15009 184735 35151 -1 3 0x10 0x4000080 kqsel syz-executor 15009 189849 35151 -1 3 0x10 0x4000080 kqread syz-executor 15009 147574 35151 -1 3 0x10 0x4000080 fsleep syz-executor 94336 268718 43083 0 3 0 0x80 nanoslp syz-executor 94336 226344 43083 0 3 0 0x4000080 sbwait syz-executor 94336 6050 43083 0 3 0 0x4000080 fsleep syz-executor 35151 307496 52166 0 3 0x2 0x80 nanoslp syz-executor 97415 314310 52166 0 2 0x2 0xc80 syz-executor 96138 337019 52166 0 3 0x2 0x80 nanoslp syz-executor 65285 251059 52166 0 3 0x2 0x80 nanoslp syz-executor 5844 56969 52166 0 2 0x2 0xc80 syz-executor 52740 125063 52166 0 2 0x2 0xc80 syz-executor 82578 276381 52166 0 3 0x2 0x80 nanoslp syz-executor 43083 285423 52166 0 3 0x2 0x80 nanoslp syz-executor 52166 355922 66227 0 3 0x2 0x80 kqread syz-executor 66227 401163 23229 0 3 0x100002 0x88 sigsusp ksh 23229 453411 25636 0 3 0x10 0x88 kqread sshd-session 25636 267782 85923 0 3 0x12 0x80 kqread sshd-session 7684 399478 1 0 3 0x100003 0x80 ttyin getty 85923 523691 1 0 3 0 0x88 kqread sshd 8275 53420 79107 74 3 0x1100012 0x80 bpf pflogd 79107 220750 1 0 3 0 0x80 sbwait pflogd 83014 435812 90221 73 3 0x1100010 0x80 kqread syslogd 90221 332870 1 0 3 0x100002 0x80 sbwait syslogd 46035 315447 1 0 3 0x100000 0x80 kqread resolvd 4831 92424 34555 77 3 0x100012 0x80 kqread dhcpleased 71049 373719 34555 77 3 0x100012 0x80 kqread dhcpleased 34555 203194 1 0 3 0 0x80 kqread dhcpleased 85002 471625 0 0 3 0x14000 0x200 bored smr 43802 18231 0 0 2 0x14000 0x200 zerothread 14887 46574 0 0 3 0x14000 0x200 aiodoned aiodoned 62176 104909 0 0 3 0x14000 0x200 syncer update 10366 279723 0 0 3 0x14000 0x200 cleaner cleaner 52164 213259 0 0 3 0x14000 0x200 reaper reaper 58527 324146 0 0 3 0x14000 0x200 pgdaemon pagedaemon 41253 46202 0 0 3 0x14000 0x200 bored viomb 6707 162027 0 0 3 0x14000 0x40000200 acpi0 acpi0 49095 402368 0 0 3 0x14000 0x40000200 idle1 23950 417656 0 0 3 0x14000 0x200 bored softnet1 9672 440504 0 0 2 0x14000 0x200 softnet0 10578 412532 0 0 3 0x14000 0x200 bored systqmp 86525 257274 0 0 3 0x14000 0x200 bored systq 21924 256803 0 0 3 0x14000 0x200 tmoslp softclockmp 40580 229717 0 0 3 0x14000 0x40000200 tmoslp softclock 72408 101776 0 0 3 0x14000 0x40000200 idle0 1 65196 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 (0xffffffff839e53f0) #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 futex_wake+0x245 futex_list_wakeup sys/kern/sys_futex.c:345 [inline] #2 futex_wake+0x245 sys/kern/sys_futex.c:482 #3 sys_futex+0x1d9 sys/kern/sys_futex.c:158 #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 Process 38257 (syz-executor) thread 0xffff80003c3e22c0 (176164) exclusive rwlock futexlk r = 0 (0xffffffff839e3ba8) #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 futex_wake+0xbc sys/kern/sys_futex.c:467 #3 sys_futex+0x1d9 sys/kern/sys_futex.c:158 #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 mutex &sched_lock r = 0 (0xffffffff839e53f0) #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 futex_wake+0x245 futex_list_wakeup sys/kern/sys_futex.c:345 [inline] #2 futex_wake+0x245 sys/kern/sys_futex.c:482 #3 sys_futex+0x1d9 sys/kern/sys_futex.c:158 #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 Process 47208 (syz-executor) thread 0xffff80003c3e2a88 (277332) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a855c0) #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 11063 12160K 12224K 166960K 12187 0 pcb 21 12K 12K 166960K 30 0 rtable 244 7K 9K 166960K 388 0 pf 34 17K 21K 166960K 53 0 ifaddr 43 7K 7K 166960K 46 0 ifgroup 55 2K 2K 166960K 57 0 sysctl 1 1K 9K 166960K 5 0 counters 70 37K 37K 166960K 72 0 ioctlops 0 0K 4K 166960K 1490 0 iov 0 0K 8K 166960K 1 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1297 82K 82K 166960K 1387 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 6 0K 0K 166960K 6 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 18 65K 97K 166960K 178 0 sigio 0 0K 0K 166960K 1 0 proc 72 115K 164K 166960K 559 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 3 0 in_multi 99 6K 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 37 175K 175K 166960K 37 0 exec 0 0K 1K 166960K 392 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 235 167K 178K 166960K 3471 0 UVM aobj 5 2K 2K 166960K 5 0 pinsyscall 43 86K 106K 166960K 1364 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 28 2K 2K 166960K 29 0 temp 37 9114K 9120K 166960K 4052 0 kqueue 15 24K 28K 166960K 36 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 40 0 37 1 0 1 1 0 8 0 rtentry 176 114 0 4 6 0 6 6 0 8 0 unpcb 144 59 0 36 1 0 1 1 0 8 0 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpcb 736 15 0 11 1 0 1 1 0 8 0 arp 136 19 0 1 1 0 1 1 0 8 0 inpcb 328 101 0 88 2 0 2 2 0 8 0 nd6 152 24 0 0 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 1 0 1 1 0 1 1 0 8 1 pffrag 232 2 0 0 1 0 1 1 0 482 0 pffrnode 88 2 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 4 0 4 1 0 1 1 0 8 1 pfanchor 1288 1 0 1 1 0 1 1 0 8 1 pftag 88 2 0 2 1 0 1 1 0 8 1 pfstitem 24 20 0 0 1 0 1 1 0 8 0 pfstkey 128 20 0 0 1 0 1 1 0 8 0 pfstate 448 20 0 0 3 0 3 3 0 8 0 pfrule 1360 23 0 19 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 457 0 2 29 0 29 29 0 8 0 art_table 40 458 0 2 5 0 5 5 0 8 0 art_node 32 114 0 14 1 0 1 1 0 8 0 semapl 72 4 0 0 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1630 0 161 93 0 93 93 0 8 0 ffsino 296 1630 0 161 114 0 114 114 0 8 0 nchpl 144 1885 0 179 64 0 64 64 0 8 0 vnodes 216 1735 0 0 97 0 97 97 0 8 0 namei 1024 5787 0 5787 2 0 2 2 0 8 2 percpumem 16 52 0 1 1 0 1 1 0 8 0 pfiaddrpl 120 1 0 1 1 0 1 1 0 8 1 kstatmem 264 29 0 2 2 0 2 2 0 8 0 scxspl 216 6355 0 6355 3 2 1 2 1 8 1 plimitpl 152 35 0 17 1 0 1 1 0 8 0 sigapl 424 504 0 456 7 0 7 7 0 8 1 knotepl 120 497 0 0 16 0 16 16 0 8 0 kqueuepl 224 34 0 21 1 0 1 1 0 8 0 pipepl 344 132 0 105 3 0 3 3 0 8 0 fdescpl 528 488 0 456 3 0 3 3 0 8 0 filepl 160 1752 0 1519 10 0 10 10 0 8 0 lockfpl 104 36 0 33 1 0 1 1 0 8 0 lockfspl 48 16 0 13 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 32 0 15 1 0 1 1 0 8 0 ucredpl 104 120 0 105 1 0 1 1 0 8 0 zombiepl 144 456 0 456 1 0 1 1 0 8 1 processpl 1232 504 0 456 5 0 5 5 0 8 0 procpl 664 570 0 510 6 0 6 6 0 8 0 sockpl 752 202 0 163 5 0 5 5 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 134 0 0 17 0 17 17 0 8 0 mcl2k 2048 20 0 0 3 0 3 3 0 8 0 mextrefs 64 20 0 0 1 0 1 1 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 134 0 0 9 0 9 9 0 8 0 bufpl 272 2341 0 106 149 0 149 149 0 8 0 anonpl 32 3910 0 0 32 0 32 32 0 247 0 amapchunkpl 152 9698 0 9208 22 0 22 22 0 158 0 amappl16 200 2051 0 2029 5 0 5 5 0 8 3 amappl15 192 9 0 9 1 0 1 1 0 8 1 amappl14 184 442 0 441 1 0 1 1 0 8 0 amappl13 176 128 0 116 1 0 1 1 0 8 0 amappl12 168 743 0 713 2 0 2 2 0 8 0 amappl11 160 11 0 10 1 0 1 1 0 8 0 amappl10 152 64 0 49 1 0 1 1 0 8 0 amappl9 144 275 0 275 1 0 1 1 0 8 1 amappl8 136 106 0 103 1 0 1 1 0 8 0 amappl7 128 147 0 134 1 0 1 1 0 8 0 amappl6 120 152 0 151 1 0 1 1 0 8 0 amappl5 112 99 0 88 1 0 1 1 0 8 0 amappl4 104 297 0 277 1 0 1 1 0 8 0 amappl3 96 1683 0 1589 3 0 3 3 0 8 0 amappl2 88 604 0 531 2 0 2 2 0 8 0 amappl1 80 10763 0 10146 15 0 15 15 0 8 0 amappl 88 2727 0 2564 5 0 5 5 0 92 1 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 4 0 0 1 0 1 1 0 8 0 uaddrrnd 24 488 0 456 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 488 0 456 1 0 1 1 0 8 0 vmmpekpl 168 6039 0 6008 2 0 2 2 0 8 0 vmmpepl 168 40713 0 38771 87 0 87 87 0 357 1 vmsppl 488 487 0 456 5 0 5 5 0 8 0 rwobjpl 80 15397 0 14374 24 0 24 24 0 8 1 pdppl 4096 983 0 912 103 16 87 87 0 8 16 pvpl 32 9714 0 0 80 1 79 79 0 265 0 pmappl 256 487 0 456 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 424 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(ffffffff839bfff0) 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_4(b008,0) at x86_bus_space_io_read_4+0x37 sys/arch/amd64/amd64/bus_space.c:682 acpitimer_delay(1) at acpitimer_delay+0x57 acpitimer_read sys/dev/acpi/acpitimer.c:141 [inline] acpitimer_delay(1) at acpitimer_delay+0x57 sys/dev/acpi/acpitimer.c:120 comcnputc(800,65) at comcnputc+0x29b sys/dev/ic/com.c:1274 cnputc(65) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(65) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x223 sys/kern/subr_prf.c:723 db_printf(ffffffff83546dbf) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80003b3b9a10) at db_ktrap+0xe3 db_printtrap sys/arch/amd64/amd64/db_interface.c:99 [inline] db_ktrap(6,0,ffff80003b3b9a10) at db_ktrap+0xe3 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80003b3b9a10) at kerntrap+0x243 sys/arch/amd64/amd64/trap.c:519 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff80003c3e2a88,fffff9806b5a3a48,ffff80003b3b9bf0) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691 end trace frame: 0xffff80003b3b9c60, count: 0 ddb{0}> trace x86_ipi_db(ffffffff839bfff0) 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_4(b008,0) at x86_bus_space_io_read_4+0x37 sys/arch/amd64/amd64/bus_space.c:682 acpitimer_delay(1) at acpitimer_delay+0x57 acpitimer_read sys/dev/acpi/acpitimer.c:141 [inline] acpitimer_delay(1) at acpitimer_delay+0x57 sys/dev/acpi/acpitimer.c:120 comcnputc(800,65) at comcnputc+0x29b sys/dev/ic/com.c:1274 cnputc(65) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(65) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x223 sys/kern/subr_prf.c:723 db_printf(ffffffff83546dbf) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80003b3b9a10) at db_ktrap+0xe3 db_printtrap sys/arch/amd64/amd64/db_interface.c:99 [inline] db_ktrap(6,0,ffff80003b3b9a10) at db_ktrap+0xe3 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80003b3b9a10) at kerntrap+0x243 sys/arch/amd64/amd64/trap.c:519 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff80003c3e2a88,fffff9806b5a3a48,ffff80003b3b9bf0) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691 sys_futimes(ffff80003c3e2a88,ffff80003b3b9d40,ffff80003b3b9c90) at sys_futimes+0x208 sys/kern/vfs_syscalls.c:2733 syscall(ffff80003b3b9d40) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003b3b9d40) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x23b9484da40, count: -17 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x7f3df7508f70, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7f3df7508f70, count: -1