uvm_fault(0xffffffff839c1410, 0xffff800027f83ed8, 0, 1) -> d fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff81a086bd cs 8 rflags 10246 cr2 ffff800027f83ed8 cpl 0 rsp ffff80002a3ac720 gsbase 0xffff8000299edff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff81a086bd Starting stack trace... panic(ffffffff833ba7dd) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80002a3ac670) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b ffs2_balloc(fffffd806b435980,f9c000,4000,fffffd80097fb618,2,ffff80002a3ac8f8) at ffs2_balloc+0xa0d sys/ufs/ffs/ffs_balloc.c:614 ffs_write(ffff80002a3ac980) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffd807150be88,ffff80002a3acb38,7,fffffd80097fb618) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffffd805efd3d20,ffff80002a3acb38,0) at vn_write+0x1d3 sys/kern/vfs_vnops.c:408 dofilewritev(ffff80003c43c558,5,ffff80002a3acb38,0,ffff80002a3acbf0) at dofilewritev+0x242 sys/kern/sys_generic.c:380 sys_write(ffff80003c43c558,ffff80002a3acca0,ffff80002a3acbf0) at sys_write+0xa2 sys/kern/sys_generic.c:300 syscall(ffff80002a3acca0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a3acca0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x930f77be700, count: 246 End of stack trace. WARNING: SPL NOT LOWERED ON TRAP EXIT 4 0 Stopped at proc_trampoline+0xc7: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND 258883 15310 0 0 0 0 syz-executor *190195 65116 0 0 0 1 syz-executor proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x75ee11119610, 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(0xffffffff839c1410, 0xffff800027f83ed8, 0, 1) -> d ddb{1}> trace proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x75ee11119610, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c47d080 rbx 0 rdx 0 rcx 0xffff800038be6020 rax 0x2a r8 0xffff80003c47cfb0 r9 0x1 r10 0x2a26bc82032962ed r11 0xf71aa25182b0ac71 r12 0 r13 0xffffffff82728f28 Xdoreti+0x18 r14 0 r15 0 rip 0xffffffff8216d4c7 proc_trampoline+0xc7 cs 0x8 rflags 0x246 rsp 0xffff80003c47d000 ss 0x10 proc_trampoline+0xc7: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=190195 pid=65116 tcnt=3 stat=onproc flags process=0 proc=0 runpri=86, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800038be6a80,0xffff800038be7788 process=0xffff80002a3d2698 user=0xffff80003c478000, vmspace=0xfffffd806bfb79a8 estcpu=36, cpticks=5, pctcpu=0.0, user=4, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 15310 258883 35128 0 7 0 syz-executor 15310 7371 35128 0 2 0x4000000 syz-executor *65116 190195 99424 0 7 0 syz-executor 65116 55174 99424 0 3 0x4000080 fsleep syz-executor 65116 302523 99424 0 3 0x4000080 fifor syz-executor 24103 119852 35254 0 2 0 syz-executor 24103 268517 35254 0 3 0x4000080 fsleep syz-executor 45265 325403 60265 0 2 0 syz-executor 45265 149884 60265 0 3 0x4000080 fsleep syz-executor 45265 343819 60265 0 3 0x4000080 fsleep syz-executor 97846 211216 25291 0 3 0x3000 suspend syz-executor 97846 53524 25291 0 3 0x4081000 sbar syz-executor 97846 340422 25291 0 3 0x4081000 fltagain2 syz-executor 91805 393823 0 0 3 0x14200 acct acct 78713 319874 54629 0 3 0x82 nanoslp syz-executor 71126 414897 54629 0 2 0x2 syz-executor 35254 363017 54629 0 3 0x82 nanoslp syz-executor 62609 499300 0 0 3 0x14200 bored sosplice 29161 494458 5852 0 3 0x100082 sbwait arp 5852 441549 1 0 3 0x10008a sigsusp sh 71732 37302 54629 0 3 0x82 nanoslp syz-executor 60265 498037 54629 0 3 0x82 nanoslp syz-executor 35128 352784 54629 0 3 0x82 nanoslp syz-executor 99424 98896 54629 0 3 0x82 nanoslp syz-executor 25291 215253 54629 0 3 0x82 nanoslp syz-executor 54629 394045 26188 0 3 0x82 kqread syz-executor 26188 450382 79936 0 3 0x10008a sigsusp ksh 79936 32213 6509 0 3 0x98 kqread sshd-session 6509 333285 20273 0 3 0x92 kqread sshd-session 52029 370042 1 0 3 0x100083 ttyopn getty 20273 109085 1 0 3 0x88 kqread sshd 58645 107030 87317 74 3 0x1100092 bpf pflogd 87317 116601 1 0 3 0x80 sbwait pflogd 71894 32690 69325 73 3 0x1100090 kqread syslogd 69325 141141 1 0 3 0x100082 sbwait syslogd 62728 445940 1 0 3 0x100080 kqread resolvd 61134 191148 72329 77 3 0x100092 kqread dhcpleased 49486 1305 72329 77 3 0x100092 kqread dhcpleased 72329 30667 1 0 3 0x80 kqread dhcpleased 2780 259602 0 0 3 0x14200 bored smr 38310 69445 0 0 2 0x14200 zerothread 53420 140019 0 0 3 0x14200 aiodoned aiodoned 58555 199647 0 0 3 0x14200 syncer update 57932 339418 0 0 3 0x14200 cleaner cleaner 69849 410900 0 0 3 0x14200 reaper reaper 60405 120333 0 0 3 0x14200 pgdaemon pagedaemon 14082 370696 0 0 3 0x14200 bored viomb 9639 57862 0 0 3 0x40014200 acpi0 acpi0 26845 419738 0 0 3 0x40014200 idle1 67649 256015 0 0 3 0x14200 bored softnet1 32906 372887 0 0 3 0x14200 netlock softnet0 78615 24237 0 0 2 0x40014200 systqmp 92574 492030 0 0 3 0x14200 bored systq 67422 29268 0 0 3 0x14200 tmoslp softclockmp 27907 493420 0 0 3 0x40014200 tmoslp softclock 68185 200582 0 0 3 0x40014200 idle0 1 279192 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 97846 (syz-executor) thread 0xffff80003c43c558 (53524) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839d3030) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 #2 sleep_finish+0x2d8 sys/kern/kern_synch.c:367 #3 biowait+0xc6 sys/kern/vfs_bio.c:1242 #4 bwrite+0x2e7 sys/kern/vfs_bio.c:754 #5 ffs2_balloc+0x18b4 sys/ufs/ffs/ffs_balloc.c:701 #6 ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 #7 VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 #8 vn_write+0x1d3 sys/kern/vfs_vnops.c:408 #9 dofilewritev+0x242 sys/kern/sys_generic.c:380 #10 sys_write+0xa2 sys/kern/sys_generic.c:300 #11 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #11 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 #12 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806b435a20) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10259 11056K 12400K 166960K 13980 0 pcb 17 18K 22K 166960K 877 0 rtable 226 21K 21K 166960K 702 0 pf 49 20K 67488K 166960K 359 0 ifaddr 41 7K 7K 166960K 190 0 ifgroup 68 2K 3K 166960K 369 0 sysctl 4 1K 9K 166960K 19 0 counters 76 37K 38K 166960K 422 0 ioctlops 0 0K 4K 166960K 1961 0 iov 1 2K 28K 166960K 196 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1489 94K 94K 166960K 3344 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 35 0 VM map 2 1K 1K 166960K 2 0 sem 15 16K 16K 166960K 121 0 dirhash 12 2K 2K 166960K 57 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 19 69K 244K 166960K 2316 0 sigio 0 0K 0K 166960K 43 0 proc 73 115K 147K 166960K 785 0 subproc 81 5K 5K 166960K 100 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 288 0 in_multi 76 5K 6K 166960K 198 0 ether_multi 1 0K 0K 166960K 19 0 mrt 2 0K 0K 166960K 16 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 265 1182K 1182K 166960K 265 0 exec 0 0K 1K 166960K 738 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 8 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 267 170K 188K 166960K 22525 0 UVM aobj 131 4K 4K 166960K 136 0 pinsyscall 45 90K 104K 166960K 3523 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 159 0 NDP 15 0K 1K 166960K 139 0 temp 79 8656K 8785K 166960K 102344 0 kqueue 15 24K 33K 166960K 508 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 120 203 0 199 1 0 1 1 0 8 0 rtentry 176 200 0 120 5 0 5 5 0 8 0 unpcb 144 1262 0 1240 11 7 4 4 0 8 3 syncache 336 9 0 9 4 4 0 1 0 8 0 tcpqe 32 2 0 2 2 2 0 1 0 8 0 tcpcb 736 912 0 907 16 9 7 7 0 8 6 arp 136 35 0 20 1 0 1 1 0 8 0 inpcb 328 3222 0 3209 40 30 10 15 0 8 8 nd6 152 37 0 16 1 0 1 1 0 8 0 pkpcb 40 17 0 17 6 5 1 1 0 8 1 kcovpl 48 11 0 2 1 0 1 1 0 8 0 mppekey 1024 5 0 5 2 2 0 1 0 8 0 ppxss 1192 140 0 139 2 1 1 1 0 8 0 pppxif 1504 16 0 15 3 2 1 1 0 8 0 pfstscr 40 13 0 12 2 1 1 1 0 8 0 pffrag 232 13 0 8 1 0 1 1 0 482 0 pffrnode 88 12 0 8 1 0 1 1 0 8 0 pffrent 40 20 0 13 1 0 1 1 0 8 0 pfosfp 40 1429 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1429 0 714 21 0 21 21 0 8 0 pfrktable 1344 7 0 7 2 2 0 1 0 8 0 pfanchor 1288 3 0 1 2 1 1 1 0 8 0 pftag 88 7 0 2 2 1 1 1 0 8 0 pfqueue 320 2 0 2 2 1 1 1 0 8 1 pfstitem 24 168 0 60 1 0 1 1 0 8 0 pfstkey 128 184 0 77 4 0 4 4 0 8 0 pfstate 384 173 0 69 11 0 11 11 0 8 0 pfrule 1344 80 0 74 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 848 0 505 33 9 24 28 0 8 0 art_table 40 851 0 505 5 0 5 5 0 8 0 art_node 32 199 0 129 1 0 1 1 0 8 0 sysvmsgpl 40 15 0 12 1 0 1 1 0 8 0 semupl 112 4 0 4 2 1 1 1 0 8 1 semapl 112 114 0 101 1 0 1 1 0 8 0 shmpl 112 133 0 5 4 0 4 4 0 8 0 dirhash 1024 47 0 30 3 0 3 3 0 8 0 dino2pl 256 5957 0 4453 96 0 96 96 0 8 0 ffsino 296 5957 0 4453 117 0 117 117 0 8 0 nchpl 144 9047 0 7336 64 0 64 64 0 8 0 rtmask 32 28 0 28 6 5 1 1 0 8 1 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 32517 0 32517 3 2 1 2 0 8 1 percpumem 16 226 0 173 1 0 1 1 0 8 0 pfiaddrpl 120 1 0 1 1 1 0 1 0 8 0 kstatmem 264 246 0 208 3 0 3 3 0 8 0 scsiplug 72 10 0 10 3 2 1 1 0 8 1 scxspl 216 81819 0 81819 15 13 2 8 1 8 2 plimitpl 152 800 0 781 1 0 1 1 0 8 0 sigapl 424 2603 0 2552 7 0 7 7 0 8 0 knotepl 120 758 0 0 23 0 23 23 0 8 0 kqueuepl 224 1379 0 1368 18 13 5 5 0 8 4 pipepl 344 403 0 372 9 5 4 9 0 8 0 fdescpl 528 2580 0 2547 3 0 3 3 0 8 0 filepl 160 18429 0 18187 28 13 15 17 0 8 3 lockfpl 104 945 0 943 2 1 1 2 0 8 0 lockfspl 48 339 0 337 1 0 1 1 0 8 0 sessionpl 144 30 0 21 1 0 1 1 0 8 0 pgrppl 48 142 0 124 1 0 1 1 0 8 0 ucredpl 104 2884 0 2871 1 0 1 1 0 8 0 zombiepl 144 2557 0 2554 1 0 1 1 0 8 0 processpl 1232 2603 0 2552 5 0 5 5 0 8 0 procpl 664 6290 0 6231 7 1 6 7 0 8 0 sosppl 168 18 0 18 3 2 1 1 0 8 1 sockpl 752 4803 0 4764 52 40 12 21 0 8 7 mcl64k 65536 33 0 0 4 0 4 4 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 4 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 119 0 0 15 0 15 15 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 64 0 0 6 0 6 6 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 1201 0 0 74 0 74 74 0 8 0 bufpl 280 34301 0 28164 439 0 439 439 0 8 0 anonpl 32 15286 0 0 123 0 123 123 0 246 0 amapchunkpl 152 78372 0 77773 54 17 37 37 0 158 9 amappl16 200 11607 0 11327 97 66 31 36 0 8 8 amappl15 192 64 0 63 1 0 1 1 0 8 0 amappl14 184 10 0 10 2 2 0 1 0 8 0 amappl13 176 468 0 466 1 0 1 1 0 8 0 amappl12 168 2989 0 2944 3 0 3 3 0 8 0 amappl11 160 5 0 5 1 1 0 1 0 8 0 amappl10 152 45 0 31 1 0 1 1 0 8 0 amappl9 144 312 0 312 1 1 0 1 0 8 0 amappl8 136 116 0 113 1 0 1 1 0 8 0 amappl7 128 125 0 123 1 0 1 1 0 8 0 amappl6 120 318 0 302 1 0 1 1 0 8 0 amappl5 112 82 0 71 1 0 1 1 0 8 0 amappl4 104 475 0 442 1 0 1 1 0 8 0 amappl3 96 13891 0 13791 4 1 3 3 0 8 0 amappl2 88 2748 0 2667 3 1 2 3 0 8 0 amappl1 80 19335 0 18712 16 0 16 16 0 8 0 amappl 88 21339 0 21155 5 0 5 5 0 92 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 dma32768 32768 2 0 2 2 2 0 1 0 8 0 dma4096 4096 3 0 3 3 2 1 1 0 8 1 dma2048 2048 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 7 0 7 2 2 0 1 0 8 0 dma128 128 258 0 258 5 5 0 1 0 8 0 dma64 64 7 0 7 2 2 0 1 0 8 0 dma32 32 9 0 9 3 3 0 1 0 8 0 dma16 16 20 0 19 1 0 1 1 0 8 0 aobjpl 72 135 0 5 3 0 3 3 0 8 0 uaddrrnd 24 2580 0 2547 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2580 0 2547 1 0 1 1 0 8 0 vmmpekpl 168 20429 0 20381 3 0 3 3 0 8 0 vmmpepl 168 170757 0 168483 149 31 118 120 0 357 6 vmsppl 488 2579 0 2547 5 0 5 5 0 8 0 rwobjpl 80 53038 0 45734 157 0 157 157 0 8 3 pdppl 4096 5167 0 5094 115 40 75 83 0 8 2 pvpl 32 23990 0 0 193 0 193 193 0 265 0 pmappl 256 2579 0 2547 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 388 0 73 10 0 10 10 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83837ff0) 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(ffffffff839d2e28) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839d2e28) at __mp_lock+0x199 sys/kern/kern_lock.c:165 softintr_dispatch(2) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(2) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsofttty() at Xsofttty+0x27 __mp_lock(ffffffff839d2e28) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839d2e28) at __mp_lock+0x199 sys/kern/kern_lock.c:165 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x71c431e6afd0, count: 4 ddb{0}> trace x86_ipi_db(ffffffff83837ff0) 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(ffffffff839d2e28) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839d2e28) at __mp_lock+0x199 sys/kern/kern_lock.c:165 softintr_dispatch(2) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(2) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsofttty() at Xsofttty+0x27 __mp_lock(ffffffff839d2e28) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839d2e28) at __mp_lock+0x199 sys/kern/kern_lock.c:165 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x71c431e6afd0, count: -11 ddb{0}> machine ddbcpu 1 Stopped at proc_trampoline+0xc7: movl $0,%gs:0x688 proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x75ee11119610, count: 14 ddb{1}> trace proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x75ee11119610, count: -1