uvm_fault(0xffffffff83ab44f0, 0xffff800023e33d08, 0, 1) -> d kernel: page fault trap, code=0 Stopped at ffs2_balloc+0xa0d: movq 0(%rcx,%rax,8),%r14 TID PID UID PRFLAGS PFLAGS CPU COMMAND 141535 6148 0 0 0 0 syz-executor *113463 4999 0 0x1000 0x4080000 1K syz-executor ffs2_balloc(fffffd8060472bb8,eb4000,4000,fffffd80097fd3a8,2,ffff800034baae78) at ffs2_balloc+0xa0d sys/ufs/ffs/ffs_balloc.c:614 ffs_write(ffff800034baaf00) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffd805e9c2490,ffff800034bab0b8,7,fffffd80097fd3a8) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffffd806c784728,ffff800034bab0b8,0) at vn_write+0x1d3 sys/kern/vfs_vnops.c:408 dofilewritev(ffff8000fffef770,4,ffff800034bab0b8,0,ffff800034bab170) at dofilewritev+0x2bd sys/kern/sys_generic.c:384 sys_write(ffff8000fffef770,ffff800034bab220,ffff800034bab170) at sys_write+0xa2 sys/kern/sys_generic.c:300 syscall(ffff800034bab220) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800034bab220) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfd6f0d596c0, count: 7 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}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: uvm_fault(0xffffffff83ab44f0, 0xffff800023e33d08, 0, 1) -> d ddb{1}> trace ffs2_balloc(fffffd8060472bb8,eb4000,4000,fffffd80097fd3a8,2,ffff800034baae78) at ffs2_balloc+0xa0d sys/ufs/ffs/ffs_balloc.c:614 ffs_write(ffff800034baaf00) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffd805e9c2490,ffff800034bab0b8,7,fffffd80097fd3a8) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffffd806c784728,ffff800034bab0b8,0) at vn_write+0x1d3 sys/kern/vfs_vnops.c:408 dofilewritev(ffff8000fffef770,4,ffff800034bab0b8,0,ffff800034bab170) at dofilewritev+0x2bd sys/kern/sys_generic.c:384 sys_write(ffff8000fffef770,ffff800034bab220,ffff800034bab170) at sys_write+0xa2 sys/kern/sys_generic.c:300 syscall(ffff800034bab220) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800034bab220) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfd6f0d596c0, count: -8 ddb{1}> show registers rdi 0 rsi 0x2 rbp 0xffff800034baae20 rbx 0 rdx 0 rcx 0xffff800023e32000 rax 0x3a1 r8 0xffffffffffffffff r9 0xffff800034baae78 r10 0x73a48582a8e1d858 r11 0x555931d94de11b6 r12 0x1 r13 0xffff800000c31800 r14 0xffff800034baacb0 r15 0xfffffd805f64e690 rip 0xffffffff8244839d ffs2_balloc+0xa0d cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff800034baaca0 ss 0x10 ffs2_balloc+0xa0d: movq 0(%rcx,%rax,8),%r14 ddb{1}> show proc PROC (syz-executor) tid=113463 pid=4999 tcnt=2 stat=onproc flags process=1000 proc=4080000 runpri=17, usrpri=52, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003b7d8020 scnt=1 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003b7d8020,0xffff80003c418fc8 process=0xffff80002a39f9d8 user=0xffff800034ba6000, vmspace=0xfffffd806f5e4008 estcpu=2, cpticks=13, pctcpu=0.11, user=0, sys=11, intr=2 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 6148 141535 78810 0 7 0 syz-executor 6148 275032 78810 0 2 0x4000000 syz-executor 19330 181493 54734 0 2 0 syz-executor 50467 333901 35384 0 2 0 syz-executor 50467 25096 35384 0 3 0x4000080 fsleep syz-executor 15068 257768 83898 0 2 0 syz-executor 15068 107896 83898 0 3 0x4000080 fsleep syz-executor 15068 111094 83898 0 3 0x4000080 fsleep syz-executor 15068 92733 83898 0 3 0x4000080 fsleep syz-executor 67768 33461 90386 0 2 0 syz-executor 67768 334002 90386 0 2 0x4000000 syz-executor 34735 420451 8612 0 3 0x80 nanoslp syz-executor 34735 162211 8612 0 3 0x4000080 ttyin syz-executor 34735 204308 8612 0 3 0x4000080 fsleep syz-executor 24132 248098 96517 0 3 0x81 nanoslp syz-executor 24132 116580 96517 0 3 0x4000081 ttyin syz-executor 24132 319471 96517 0 3 0x4000081 fsleep syz-executor 24132 354314 96517 0 3 0x4000081 fsleep syz-executor 14663 373772 1 0 3 0x82 nanoslp getty 80428 160635 0 0 3 0x14200 acct acct 4999 489273 86737 0 3 0x3000 suspend syz-executor * 4999 113463 86737 0 7 0x4081000 syz-executor 90386 367878 77914 0 3 0x82 nanoslp syz-executor 35384 34465 77914 0 3 0x82 nanoslp syz-executor 96517 19106 77914 0 3 0x82 nanoslp syz-executor 54734 312876 77914 0 2 0x2 syz-executor 83898 212218 77914 0 3 0x82 nanoslp syz-executor 78810 182059 77914 0 3 0x82 nanoslp syz-executor 8612 397906 77914 0 3 0x82 nanoslp syz-executor 86737 153516 77914 0 3 0x82 wait syz-executor 77914 473054 1 0 3 0x82 kqread syz-executor 88369 338522 0 0 3 0x14200 bored smr 46868 225500 0 0 2 0x14200 zerothread 42159 209296 0 0 3 0x14200 aiodoned aiodoned 38943 19216 0 0 3 0x14200 syncer update 3235 342095 0 0 3 0x14200 cleaner cleaner 55248 439107 0 0 3 0x14200 reaper reaper 72674 300044 0 0 3 0x14200 pgdaemon pagedaemon 3908 343385 0 0 3 0x14200 bored viomb 9995 431157 0 0 3 0x40014200 acpi0 acpi0 80047 331318 0 0 3 0x40014200 idle1 95986 330525 0 0 3 0x14200 bored softnet1 54923 291964 0 0 3 0x14200 bored softnet0 5566 460680 0 0 3 0x14200 bored systqmp 64200 471241 0 0 3 0x14200 bored systq 31345 410976 0 0 3 0x14200 tmoslp softclockmp 61517 159229 0 0 3 0x40014200 tmoslp softclock 25252 348974 0 0 3 0x40014200 idle0 1 139732 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 4999 (syz-executor) thread 0xffff8000fffef770 (113463) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a4a780) #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:369 #3 biowait+0xc6 sys/kern/vfs_bio.c:1242 #4 bwrite+0x2e7 sys/kern/vfs_bio.c:754 #5 ffs_write+0x810 sys/ufs/ffs/ffs_vnops.c:377 #6 VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 #7 vn_write+0x1d3 sys/kern/vfs_vnops.c:408 #8 dofilewritev+0x2bd sys/kern/sys_generic.c:384 #9 sys_write+0xa2 sys/kern/sys_generic.c:300 #10 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8060472c58) #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+0xbd 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+0x2bd sys/kern/sys_generic.c:384 #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:783 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11062 12089K 12432K 166960K 12577 0 pcb 18 12K 12K 166960K 55 0 rtable 211 7K 7K 166960K 397 0 pf 33 17K 21K 166960K 69 0 ifaddr 40 7K 7K 166960K 56 0 ifgroup 51 2K 2K 166960K 73 0 sysctl 3 1K 9K 166960K 8 0 counters 68 36K 37K 166960K 92 0 ioctlops 0 0K 4K 166960K 1534 0 iov 0 0K 16K 166960K 9 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1298 82K 82K 166960K 1558 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 9 0K 0K 166960K 9 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 65K 105K 166960K 382 0 sigio 0 0K 0K 166960K 2 0 proc 21 33K 147K 166960K 587 0 subproc 72 4K 4K 166960K 73 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 28 0 in_multi 92 6K 7K 166960K 108 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 109 493K 493K 166960K 109 0 exec 0 0K 1K 166960K 434 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 140 86K 172K 166960K 5329 0 UVM aobj 9 2K 2K 166960K 9 0 pinsyscall 20 40K 100K 166960K 1566 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 15 0 NDP 11 0K 2K 166960K 34 0 temp 41 9079K 9185K 166960K 5359 0 kqueue 1 2K 29K 166960K 62 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 51 0 51 1 0 1 1 0 8 1 rtentry 176 116 0 24 6 0 6 6 0 8 0 unpcb 144 189 0 189 2 0 2 2 0 8 2 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 56 0 55 1 0 1 1 0 8 0 arp 136 18 0 2 1 0 1 1 0 8 0 inpcb 328 214 0 209 2 0 2 2 0 8 1 nd6 152 25 0 3 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 9 0 9 1 0 1 1 0 8 1 pppxif 1576 1 0 1 1 0 1 1 0 8 1 pfstscr 40 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 3 0 1 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 pfsrclim 320 1 0 1 1 0 1 1 0 8 1 pftag 88 1 0 1 1 0 1 1 0 8 1 pfstitem 24 24 0 0 1 0 1 1 0 8 0 pfstkey 128 26 0 2 1 0 1 1 0 8 0 pfstate 448 25 0 1 3 0 3 3 0 8 0 pfrule 1360 22 0 17 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 522 0 91 29 0 29 29 0 8 2 art_table 40 523 0 91 5 0 5 5 0 8 0 art_node 32 116 0 33 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 4 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 7 0 0 1 0 1 1 0 8 0 shmpl 112 6 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2029 0 554 93 0 93 93 0 8 0 ffsino 296 2029 0 554 114 0 114 114 0 8 0 nchpl 144 2547 0 844 64 0 64 64 0 8 0 rtmask 32 2 0 2 1 0 1 1 0 8 1 vnodes 216 2221 0 0 124 0 124 124 0 8 0 namei 1024 7898 0 7898 2 0 2 2 0 8 2 percpumem 16 61 0 12 1 0 1 1 0 8 0 kstatmem 264 38 0 14 2 0 2 2 0 8 0 scsiplug 72 2 0 2 1 0 1 1 0 8 1 scxspl 216 16131 0 16131 4 2 2 3 1 8 2 plimitpl 152 102 0 88 1 0 1 1 0 8 0 sigapl 424 703 0 666 7 0 7 7 0 8 1 knotepl 120 517 0 0 16 0 16 16 0 8 0 kqueuepl 224 115 0 114 3 0 3 3 0 8 2 pipepl 344 135 0 108 3 0 3 3 0 8 0 fdescpl 528 686 0 666 3 0 3 3 0 8 0 filepl 160 2874 0 2698 12 0 12 12 0 8 2 lockfpl 104 101 0 100 1 0 1 1 0 8 0 lockfspl 48 47 0 46 1 0 1 1 0 8 0 sessionpl 144 37 0 34 1 0 1 1 0 8 0 pgrppl 48 52 0 41 1 0 1 1 0 8 0 ucredpl 104 360 0 357 1 0 1 1 0 8 0 zombiepl 144 667 0 666 1 0 1 1 0 8 0 processpl 1232 703 0 666 5 0 5 5 0 8 1 procpl 664 1116 0 1067 6 0 6 6 0 8 0 sosppl 176 2 0 2 1 0 1 1 0 8 1 sockpl 752 460 0 455 7 0 7 7 0 8 5 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 123 0 0 16 0 16 16 0 8 0 mcl2k 2048 17 0 0 3 0 3 3 0 8 0 mtagpl 96 10 0 0 1 0 1 1 0 8 0 mbufpl 256 156 0 0 10 0 10 10 0 8 0 bufpl 280 7359 0 1229 438 0 438 438 0 8 0 anonpl 32 12359 0 0 102 2 100 100 0 246 0 amapchunkpl 152 16689 0 16302 28 0 28 28 0 158 10 amappl16 200 2793 0 2525 28 3 25 28 0 8 8 amappl15 192 13 0 13 1 1 0 1 0 8 0 amappl14 184 460 0 460 1 0 1 1 0 8 1 amappl13 176 201 0 200 1 0 1 1 0 8 0 amappl12 168 957 0 939 2 0 2 2 0 8 0 amappl11 160 6 0 6 1 1 0 1 0 8 0 amappl10 152 66 0 66 1 0 1 1 0 8 1 amappl9 144 260 0 260 1 1 0 1 0 8 0 amappl8 136 109 0 109 1 0 1 1 0 8 1 amappl7 128 152 0 150 1 0 1 1 0 8 0 amappl6 120 180 0 180 1 0 1 1 0 8 1 amappl5 112 131 0 130 1 0 1 1 0 8 0 amappl4 104 304 0 300 1 0 1 1 0 8 0 amappl3 96 3126 0 3044 4 0 4 4 0 8 0 amappl2 88 560 0 550 2 0 2 2 0 8 0 amappl1 80 10874 0 10755 18 4 14 17 0 8 8 amappl 88 4478 0 4353 5 0 5 5 0 92 0 uvmvnodes 80 108 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 8 0 0 1 0 1 1 0 8 0 uaddrrnd 24 686 0 666 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 686 0 666 1 0 1 1 0 8 0 vmmpekpl 168 7407 0 7376 2 0 2 2 0 8 0 vmmpepl 168 52817 0 51669 109 0 109 109 0 357 48 vmsppl 488 685 0 666 5 0 5 5 0 8 1 rwobjpl 80 17768 0 17075 33 0 33 33 0 8 2 pdppl 4096 1379 0 1332 103 48 55 83 0 8 8 pvpl 32 22299 0 0 180 0 180 180 0 265 0 pmappl 256 685 0 666 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 276 0 51 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83931ff0) 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(ffffffff83a49f80) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a49f80) 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 end of kernel end trace frame: 0x7ecc7d514640, count: 8 ddb{0}>