login: uvm_fault(0xfffffd806f38a5c0, 0x98, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff829f43a8 cs 8 rflags 10246 cr2 98 cpl 0 rsp ffff80002a2422f0 gsbase 0xffff80002999dff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff829f43a8 Starting stack trace... panic(ffffffff834eee54) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80002a242240) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff80003c3b82b8,fffffd805e25e108,ffff80002a242420) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2778 sys_futimes(ffff80003c3b82b8,ffff80002a242570,ffff80002a2424c0) at sys_futimes+0x208 sys/kern/vfs_syscalls.c:2820 syscall(ffff80002a242570) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a242570) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x67c38ffcd90, count: 250 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 202 0 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND *225328 72871 0 0 0x4000000 1 syz-executor 34508 82017 0 0 0 0 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0xb66b99bfff0, count: 14 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{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: uvm_fault(0xfffffd806f38a5c0, 0x98, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0xb66b99bfff0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff800035b91d60 rbx 0 rdx 0 rcx 0xffff80003c3b9a10 rax 0x33 r8 0xffff800035b91c90 r9 0x1 r10 0xfd83d588c25cb94a r11 0xcc1361f14789d06d r12 0 r13 0 r14 0xffff80003c3b9a10 r15 0 rip 0xffffffff8239b3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff800035b91ce0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=225328 pid=72871 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c3b8fb0,0xffff80003c3b87f8 process=0xffff80003c3cc9c0 user=0xffff800035b8c000, vmspace=0xfffffd806f38ad60 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 72871 426888 27823 0 2 0 syz-executor *72871 225328 27823 0 7 0x4000000 syz-executor 72871 168386 27823 0 3 0x4000080 fsleep syz-executor 82017 34508 11739 0 7 0 syz-executor 82017 296718 11739 0 3 0x4000000 sbar syz-executor 97035 45664 30415 0 2 0 syz-executor 97035 54728 30415 0 3 0x4000080 fsleep syz-executor 74672 198901 7517 0 2 0 syz-executor 74672 373172 7517 0 3 0x4000080 fsleep syz-executor 49851 256542 5049 0 2 0 syz-executor 49851 188509 5049 0 3 0x4000080 fsleep syz-executor 61607 494260 81234 0 2 0 syz-executor 61607 60432 81234 0 3 0x4000080 msgwait syz-executor 61607 318924 81234 0 2 0x4000000 syz-executor 28797 144778 24487 0 2 0 syz-executor 28797 304306 24487 0 3 0x4000080 fsleep syz-executor 49654 246226 7392 0 3 0x80 nanoslp syz-executor 49654 452462 7392 0 3 0x4000080 fsleep syz-executor 49654 111870 7392 0 3 0x4000080 msgwait syz-executor 49654 9244 7392 0 3 0x4000080 fsleep syz-executor 95977 421783 1 0 3 0x100083 ttyin getty 3182 301078 0 0 3 0x14200 acct acct 24487 353151 48526 0 3 0x82 nanoslp syz-executor 81234 142971 48526 0 3 0x82 nanoslp syz-executor 7392 363432 48526 0 3 0x82 nanoslp syz-executor 7517 482522 48526 0 3 0x82 nanoslp syz-executor 11739 75669 48526 0 3 0x82 nanoslp syz-executor 5049 246493 48526 0 3 0x82 nanoslp syz-executor 30415 115773 48526 0 3 0x82 nanoslp syz-executor 27823 111311 48526 0 3 0x82 nanoslp syz-executor 48526 316417 1 0 3 0x82 kqread syz-executor 49615 245268 47828 0 3 0x98 kqread sshd-session 47828 355277 1 0 3 0x92 kqread sshd-session 75183 278955 1 74 3 0x1100092 bpf pflogd 7519 226625 1 73 3 0x1100090 kqread syslogd 60887 450942 0 0 3 0x14200 bored smr 89362 327981 0 0 2 0x14200 zerothread 29564 444275 0 0 3 0x14200 aiodoned aiodoned 9424 294003 0 0 3 0x14200 syncer update 23285 365018 0 0 3 0x14200 cleaner cleaner 49703 328161 0 0 3 0x14200 reaper reaper 18771 106135 0 0 3 0x14200 pgdaemon pagedaemon 62988 493128 0 0 3 0x14200 bored viomb 38476 385085 0 0 3 0x40014200 acpi0 acpi0 66239 410464 0 0 3 0x40014200 idle1 91761 503822 0 0 3 0x14200 bored softnet1 26143 154466 0 0 2 0x14200 softnet0 74113 204501 0 0 2 0x40014200 systqmp 86051 227938 0 0 3 0x14200 bored systq 84346 497444 0 0 3 0x14200 tmoslp softclockmp 26769 227074 0 0 3 0x40014200 tmoslp softclock 19573 139057 0 0 3 0x40014200 idle0 1 348555 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 82017 (syz-executor) thread 0xffff80003c3b82b8 (296718) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839eee80) #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 11100 12239K 12662K 166960K 12574 0 pcb 18 13K 13K 166960K 69 0 rtable 221 9K 9K 166960K 418 0 pf 38 18K 25K 166960K 154 0 ifaddr 37 6K 7K 166960K 56 0 ifgroup 55 2K 2K 166960K 75 0 sysctl 4 1K 9K 166960K 12 0 counters 70 37K 38K 166960K 100 0 ioctlops 0 0K 4K 166960K 1647 0 iov 0 0K 16K 166960K 11 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1356 85K 86K 166960K 1722 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 8 0 VM map 2 1K 1K 166960K 2 0 sem 9 0K 0K 166960K 19 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 89K 166960K 418 0 sigio 0 0K 0K 166960K 5 0 proc 21 33K 164K 166960K 594 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 31 0 in_multi 77 5K 7K 166960K 104 0 ether_multi 1 0K 0K 166960K 2 0 mrt 1 0K 0K 166960K 17 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 229 1023K 1023K 166960K 229 0 exec 0 0K 1K 166960K 449 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 178 101K 178K 166960K 5818 0 UVM aobj 9 2K 4K 166960K 10 0 pinsyscall 28 56K 103K 166960K 1628 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 12 0 NDP 12 0K 2K 166960K 37 0 temp 44 9116K 9190K 166960K 11333 0 kqueue 6 10K 29K 166960K 93 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 26 0 0 1 0 1 1 0 8 0 rtpcb 120 52 0 52 1 0 1 1 0 8 1 rtentry 176 117 0 27 6 1 5 6 0 8 0 unpcb 144 275 0 265 7 1 6 6 0 8 5 syncache 336 5 0 5 1 1 0 1 0 8 0 tcpcb 736 81 0 77 2 1 1 2 0 8 0 arp 136 18 0 4 1 0 1 1 0 8 0 inpcb 328 316 0 310 4 2 2 4 0 8 1 nd6 152 27 0 7 1 0 1 1 0 8 0 pkpcb 40 3 0 3 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 14 0 14 1 1 0 1 0 8 0 pfstscr 40 8 0 8 2 1 1 1 0 8 1 pffrag 232 3 0 1 1 0 1 1 0 482 0 pffrnode 88 3 0 1 1 0 1 1 0 8 0 pffrent 40 6 0 4 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 0 1 0 1 1 0 8 0 pfsrclim 320 3 0 2 1 0 1 1 0 8 0 pfanchor 1288 3 0 0 1 0 1 1 0 8 0 pftag 88 3 0 0 1 0 1 1 0 8 0 pfstitem 24 53 0 3 1 0 1 1 0 8 0 pfstkey 128 59 0 9 2 0 2 2 0 8 0 pfstate 448 55 0 5 6 0 6 6 0 8 0 pfrule 1360 24 0 17 2 0 2 2 0 8 0 rttmr 136 3 0 3 1 1 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 505 0 129 29 1 28 29 0 8 0 art_table 40 506 0 129 5 0 5 5 0 8 0 art_node 32 117 0 35 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 1 2 1 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 72 14 0 7 1 0 1 1 0 8 0 shmpl 112 7 0 1 1 0 1 1 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 2176 0 705 93 0 93 93 0 8 0 ffsino 296 2176 0 705 114 0 114 114 0 8 0 nchpl 144 2740 0 1034 64 0 64 64 0 8 0 rtmask 32 3 0 3 1 1 0 1 0 8 0 vnodes 216 2456 0 0 137 0 137 137 0 8 0 namei 1024 9565 0 9565 4 2 2 2 0 8 2 percpumem 16 65 0 15 1 0 1 1 0 8 0 kstatmem 264 47 0 18 3 0 3 3 0 8 0 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 19110 0 19110 7 3 4 4 1 8 4 plimitpl 152 123 0 109 1 0 1 1 0 8 0 sigapl 424 751 0 710 7 1 6 7 0 8 0 knotepl 120 520 0 0 16 0 16 16 0 8 0 kqueuepl 224 122 0 116 2 0 2 2 0 8 1 pipepl 344 165 0 137 3 0 3 3 0 8 0 fdescpl 528 734 0 710 3 0 3 3 0 8 0 filepl 160 3985 0 3786 17 2 15 15 0 8 5 lockfpl 104 267 0 264 2 1 1 2 0 8 0 lockfspl 48 129 0 126 1 0 1 1 0 8 0 sessionpl 144 37 0 30 1 0 1 1 0 8 0 pgrppl 48 47 0 32 1 0 1 1 0 8 0 ucredpl 104 736 0 726 1 0 1 1 0 8 0 zombiepl 144 710 0 710 1 0 1 1 0 8 1 processpl 1232 751 0 710 5 0 5 5 0 8 0 procpl 664 1226 0 1173 6 0 6 6 0 8 1 sosppl 176 1 0 1 1 1 0 1 0 8 0 sockpl 752 653 0 637 19 9 10 17 0 8 8 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 120 0 0 15 0 15 15 0 8 0 mcl2k 2048 19 0 0 3 0 3 3 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 156 0 0 10 0 10 10 0 8 0 bufpl 280 9090 0 873 599 0 599 599 0 8 7 anonpl 32 12103 0 0 98 0 98 98 0 246 0 amapchunkpl 152 17972 0 17416 35 5 30 30 0 158 8 amappl16 200 1988 0 1963 19 2 17 17 0 8 14 amappl15 192 5 0 4 1 0 1 1 0 8 0 amappl14 184 439 0 439 1 0 1 1 0 8 1 amappl13 176 131 0 126 1 0 1 1 0 8 0 amappl12 168 992 0 969 2 0 2 2 0 8 0 amappl11 160 6 0 6 1 1 0 1 0 8 0 amappl10 152 67 0 63 1 0 1 1 0 8 0 amappl9 144 309 0 308 1 0 1 1 0 8 0 amappl8 136 115 0 114 1 0 1 1 0 8 0 amappl7 128 156 0 150 1 0 1 1 0 8 0 amappl6 120 157 0 157 1 0 1 1 0 8 1 amappl5 112 110 0 105 1 0 1 1 0 8 0 amappl4 104 308 0 297 1 0 1 1 0 8 0 amappl3 96 3383 0 3289 4 0 4 4 0 8 1 amappl2 88 579 0 551 2 0 2 2 0 8 0 amappl1 80 12290 0 11951 16 2 14 16 0 8 2 amappl 88 4940 0 4796 5 0 5 5 0 92 0 uvmvnodes 80 110 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 128 254 0 254 2 1 1 1 0 8 1 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 9 0 1 1 0 1 1 0 8 0 uaddrrnd 24 734 0 710 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 734 0 710 1 0 1 1 0 8 0 vmmpekpl 168 8249 0 8209 4 1 3 3 0 8 0 vmmpepl 168 55710 0 54360 101 5 96 96 0 357 18 vmsppl 488 733 0 710 5 1 4 5 0 8 0 rwobjpl 80 18317 0 17654 27 0 27 27 0 8 0 pdppl 4096 1475 0 1420 97 40 57 83 0 8 2 pvpl 32 19624 0 0 159 0 159 159 0 265 0 pmappl 256 733 0 710 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 275 0 48 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83962ff0) 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 __mp_lock(ffffffff839ee680) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839ee680) at __mp_lock+0x192 sys/kern/kern_lock.c:173 softintr_dispatch(2) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(2) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsofttty() at Xsofttty+0x27 __mp_lock(ffffffff839ee680) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839ee680) at __mp_lock+0x192 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 rw_do_exit_read(fffffd806f38a6a8,8) at rw_do_exit_read+0x4f _atomic_cas_ulong sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:72 [inline] rw_do_exit_read(fffffd806f38a6a8,8) at rw_do_exit_read+0x4f sys/kern/kern_rwlock.c:121 uvm_map_inentry_fix(ffff80002a222010,ffff80002a222058,7ebe08c6dfa0,ffffffff820a7290,0) at uvm_map_inentry_fix+0x26a vm_map_unlock_read_ln sys/uvm/uvm_map.c:5226 [inline] uvm_map_inentry_fix(ffff80002a222010,ffff80002a222058,7ebe08c6dfa0,ffffffff820a7290,0) at uvm_map_inentry_fix+0x26a sys/uvm/uvm_map.c:1635 uvm_map_inentry(ffff80002a222010,ffff80002a222058,7ebe08c6dfa0,ffffffff83502101,ffffffff820a7290,0) at uvm_map_inentry+0xf8 sys/uvm/uvm_map.c:1647 end trace frame: 0xffff80002a266eb0, count: 0 ddb{0}> trace x86_ipi_db(ffffffff83962ff0) 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 __mp_lock(ffffffff839ee680) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839ee680) at __mp_lock+0x192 sys/kern/kern_lock.c:173 softintr_dispatch(2) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(2) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsofttty() at Xsofttty+0x27 __mp_lock(ffffffff839ee680) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839ee680) at __mp_lock+0x192 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 rw_do_exit_read(fffffd806f38a6a8,8) at rw_do_exit_read+0x4f _atomic_cas_ulong sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:72 [inline] rw_do_exit_read(fffffd806f38a6a8,8) at rw_do_exit_read+0x4f sys/kern/kern_rwlock.c:121 uvm_map_inentry_fix(ffff80002a222010,ffff80002a222058,7ebe08c6dfa0,ffffffff820a7290,0) at uvm_map_inentry_fix+0x26a vm_map_unlock_read_ln sys/uvm/uvm_map.c:5226 [inline] uvm_map_inentry_fix(ffff80002a222010,ffff80002a222058,7ebe08c6dfa0,ffffffff820a7290,0) at uvm_map_inentry_fix+0x26a sys/uvm/uvm_map.c:1635 uvm_map_inentry(ffff80002a222010,ffff80002a222058,7ebe08c6dfa0,ffffffff83502101,ffffffff820a7290,0) at uvm_map_inentry+0xf8 sys/uvm/uvm_map.c:1647 syscall(ffff80002a266ec0) at syscall+0x345 mi_syscall sys/sys/syscall_mi.h:159 [inline] syscall(ffff80002a266ec0) at syscall+0x345 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ebe08c6e030, 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: 0xb66b99bfff0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0xb66b99bfff0, count: -1