uvm_fault(0xfffff0006d073028, 0x7fff0000800f, 0, 1) -> e kernel: page fault trap, code=0 Stopped at amap_lookups+0x1e0: movl 0x10(%r15),%r14d TID PID UID PRFLAGS PFLAGS CPU COMMAND 111508 44385 32767 0x10 0 1 syz-executor *235208 30086 32767 0x10 0 0 syz-executor amap_lookups(fffff00061f8f328,15000,ffff80003c3f39d0,8) at amap_lookups+0x1e0 amap_chunk_get sys/uvm/uvm_amap.c:118 [inline] amap_lookups(fffff00061f8f328,15000,ffff80003c3f39d0,8) at amap_lookups+0x1e0 sys/uvm/uvm_amap.c:1168 uvm_fault_check(ffff80003c3f3ad0,ffff80003c3f3b08,ffff80003c3f3b40,0) at uvm_fault_check+0x8d2 sys/uvm/uvm_fault.c:840 uvm_fault(fffff0006d073028,5172f99b000,0,1) at uvm_fault+0x106 sys/uvm/uvm_fault.c:627 upageflttrap(ffff80003c3f3c70,5172f99b940) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c3f3c70) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7228bc3464f0, count: 9 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: uvm_fault(0xfffff0006d073028, 0x7fff0000800f, 0, 1) -> e ddb{0}> show kasan No such command ddb{0}> trace amap_lookups(fffff00061f8f328,15000,ffff80003c3f39d0,8) at amap_lookups+0x1e0 amap_chunk_get sys/uvm/uvm_amap.c:118 [inline] amap_lookups(fffff00061f8f328,15000,ffff80003c3f39d0,8) at amap_lookups+0x1e0 sys/uvm/uvm_amap.c:1168 uvm_fault_check(ffff80003c3f3ad0,ffff80003c3f3b08,ffff80003c3f3b40,0) at uvm_fault_check+0x8d2 sys/uvm/uvm_fault.c:840 uvm_fault(fffff0006d073028,5172f99b000,0,1) at uvm_fault+0x106 sys/uvm/uvm_fault.c:627 upageflttrap(ffff80003c3f3c70,5172f99b940) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c3f3c70) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7228bc3464f0, count: -6 ddb{0}> show registers rdi 0x11 rsi 0x20 rbp 0xffff80003c3f3920 rbx 0x1 rdx 0 rcx 0x1 rax 0xffff800000c43720 r8 0xffffffff82af1fb0 uvm_map_inentry_sp r9 0 r10 0 r11 0xcc523b59f8a42f91 r12 0x1d r13 0 r14 0x20 r15 0x7fff00007fff rip 0xffffffff8172e060 amap_lookups+0x1e0 cs 0x8 rflags 0x10206 __ALIGN_SIZE+0xf206 rsp 0xffff80003c3f3890 ss 0 amap_lookups+0x1e0: movl 0x10(%r15),%r14d ddb{0}> show proc PROC (syz-executor) tid=235208 pid=30086 tcnt=1 stat=onproc flags process=10 proc=0 runpri=86, usrpri=86, slppri=16, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000383aa560,0xffff8000383ab500 process=0xffff80003a7cf040 user=0xffff80003c3ee000, vmspace=0xfffff0006d073028 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0 ddb{0}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 44374 11318 67586 32767 2 0x10 0 syz-executor 44374 380776 67586 32767 3 0x10 0x4000080 fsleep syz-executor 44385 111508 11939 32767 7 0x10 0 syz-executor 44385 439335 11939 32767 2 0x10 0x4000000 syz-executor 44385 339579 11939 32767 3 0x10 0x4000000 inode syz-executor 62995 86185 69327 32767 2 0x10 0 syz-executor *30086 235208 37552 32767 7 0x10 0 syz-executor 40278 65406 1312 32767 3 0x1010 0x2000 suspend syz-executor 40278 8693 1312 32767 2 0x1010 0x4080000 syz-executor 40278 181857 1312 32767 2 0x1010 0x4080000 syz-executor 67586 47448 82296 32767 3 0x10 0x80 nanoslp syz-executor 69327 134212 13725 32767 2 0x10 0xc80 syz-executor 35493 258848 20942 32767 3 0x10 0x80 piperd syz-executor 11939 21640 49849 32767 2 0x10 0xc80 syz-executor 37552 421024 75170 32767 3 0x10 0x80 nanoslp syz-executor 97847 273166 42303 32767 3 0x10 0x80 piperd syz-executor 1312 102406 52654 32767 3 0x10 0x80 nanoslp syz-executor 49849 466908 6280 0 3 0x2 0x80 wait syz-executor 82296 36815 6280 0 3 0x2 0x80 wait syz-executor 75170 404287 6280 0 3 0x2 0x80 wait syz-executor 13725 52341 6280 0 3 0x2 0x80 wait syz-executor 20942 99413 6280 0 3 0x2 0x80 wait syz-executor 42303 21819 6280 0 3 0x2 0x80 wait syz-executor 52654 20152 6280 0 3 0x2 0x80 wait syz-executor 6280 2294 35030 0 3 0x2 0x80 nanoslp syz-executor 35030 400712 31383 0 3 0x100002 0x88 sigsusp ksh 31383 420051 47077 0 3 0x10 0x88 kqread sshd-session 47077 18223 89463 0 3 0x12 0x80 kqread sshd-session 29737 123804 1 0 3 0x100003 0x80 ttyin getty 89463 389391 1 0 3 0 0x88 kqread sshd 47770 180233 95226 73 3 0x1100010 0x80 kqread syslogd 95226 482154 1 0 3 0x100002 0x80 sbwait syslogd 96698 218401 1 0 3 0x100000 0x80 kqread resolvd 65553 183649 77736 77 3 0x100012 0x80 kqread dhcpleased 63936 339885 77736 77 3 0x100012 0x80 kqread dhcpleased 77736 236846 1 0 3 0 0x80 kqread dhcpleased 82745 395246 0 0 3 0x14000 0x200 bored smr 94109 397506 0 0 3 0x14000 0x200 pgzero zerothread 66077 479093 0 0 3 0x14000 0x200 aiodoned aiodoned 66811 334861 0 0 3 0x14000 0x200 syncer update 36898 316717 0 0 3 0x14000 0x200 cleaner cleaner 82655 362825 0 0 3 0x14000 0x200 reaper reaper 22472 471981 0 0 3 0x14000 0x200 pgdaemon pagedaemon 22079 148953 0 0 3 0x14000 0x200 bored viomb 13290 34750 0 0 3 0x14000 0x40000200 acpi0 acpi0 15880 317053 0 0 3 0x14000 0x40000200 idle1 54503 8860 0 0 3 0x14000 0x200 bored softnet1 4122 149580 0 0 3 0x14000 0x200 bored softnet0 71899 438942 0 0 3 0x14000 0x200 bored systqmp 85025 277620 0 0 3 0x14000 0x200 bored systq 77865 152099 0 0 3 0x14000 0x200 tmoslp softclockmp 57577 502744 0 0 3 0x14000 0x40000200 tmoslp softclock 67339 19767 0 0 3 0x14000 0x40000200 idle0 1 44721 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{0}> show all locks Process 44385 (syz-executor) thread 0xffff800045fefa08 (439335) exclusive rrwlock inode r = 0 (0xfffff0006ccf5d78) #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:576 #5 vn_write+0x18f sys/kern/vfs_vnops.c:411 #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 Process 44385 (syz-executor) thread 0xffff800045fee7e0 (339579) exclusive rrwlock inode r = 0 (0xfffff0006ccf57b0) #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:576 #5 vfs_lookup+0x12b sys/kern/vfs_lookup.c:431 #6 namei+0x7c5 sys/kern/vfs_lookup.c:250 #7 vn_open+0x178 sys/kern/vfs_vnops.c:146 #8 sys_ktrace+0x9a sys/kern/kern_ktrace.c:552 #9 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #10 Xsyscall+0x128 Process 30086 (syz-executor) thread 0xffff8000383aa2c8 (235208) shared rwlock amaplk r = 0 (0xfffff0006e087778) #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_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 uvm_fault_check+0x8a9 sys/uvm/uvm_fault.c:834 #3 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #4 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #5 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #6 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffff0006d073128) #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_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1880 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #7 recall_trap+0x8 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11076 12020K 12034K 166960K 12172 0 pcb 17 12K 12K 166960K 17 0 rtable 215 6K 7K 166960K 361 0 pf 29 16K 16K 166960K 31 0 ifaddr 38 6K 7K 166960K 44 0 ifgroup 46 2K 2K 166960K 50 0 sysctl 3 1K 9K 166960K 9 0 counters 68 36K 37K 166960K 70 0 ioctlops 0 0K 4K 166960K 32 0 iov 0 0K 8K 166960K 9 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1287 81K 81K 166960K 1406 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 8 0K 0K 166960K 10 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 21 77K 125K 166960K 309 0 sigio 0 0K 0K 166960K 4 0 proc 58 99K 180K 166960K 501 0 subproc 63 3K 4K 166960K 117 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 38 0 in_multi 88 6K 7K 166960K 102 0 ether_multi 1 0K 0K 166960K 1 0 mrt 1 0K 0K 166960K 7 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 235 1049K 1049K 166960K 235 0 exec 0 0K 1K 166960K 383 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 215 158K 196K 166960K 4304 0 UVM aobj 13 2K 2K 166960K 13 0 pinsyscall 42 84K 112K 166960K 1402 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 11 0 NDP 10 0K 2K 166960K 27 0 temp 35 9119K 9125K 166960K 4116 0 kqueue 13 20K 30K 166960K 57 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> 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 120 121 0 118 3 0 3 3 0 8 2 rtentry 176 113 0 14 6 0 6 6 0 8 1 unpcb 144 201 0 184 4 0 4 4 0 8 3 syncache 336 6 0 6 1 0 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 736 97 0 57 4 0 4 4 0 8 0 arp 136 18 0 2 1 0 1 1 0 8 0 inpcb 328 257 0 214 4 0 4 4 0 8 0 ip6q 72 3 0 2 1 0 1 1 0 8 0 ip6af 40 4 0 4 1 0 1 1 0 8 1 nd6 152 26 0 5 1 0 1 1 0 8 0 kcovpl 48 13 0 6 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 470 0 62 30 0 30 30 0 8 3 art_table 40 471 0 62 5 0 5 5 0 8 0 art_node 32 113 0 23 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 1 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 72 7 0 1 1 0 1 1 0 8 0 shmpl 112 10 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1766 0 296 93 0 93 93 0 8 0 ffsino 296 1766 0 296 114 0 114 114 0 8 0 nchpl 144 2157 0 463 63 0 63 63 0 8 0 vnodes 216 1892 0 0 106 0 106 106 0 8 0 namei 1024 6678 0 6677 2 0 2 2 0 8 1 percpumem 16 51 0 1 1 0 1 1 0 8 0 kstatmem 264 25 0 2 2 0 2 2 0 8 0 scxspl 216 7693 0 7693 6 2 4 4 1 8 4 plimitpl 152 63 0 41 2 0 2 2 0 8 1 sigapl 424 593 0 544 7 0 7 7 0 8 0 knotepl 120 523 0 0 16 0 16 16 0 8 0 kqueuepl 224 66 0 56 2 0 2 2 0 8 1 pipepl 344 146 0 119 3 0 3 3 0 8 0 fdescpl 528 577 0 544 4 0 4 4 0 8 0 filepl 160 2710 0 2482 13 0 13 13 0 8 3 lockfpl 104 49 0 47 1 0 1 1 0 8 0 lockfspl 48 20 0 18 1 0 1 1 0 8 0 sessionpl 144 44 0 29 1 0 1 1 0 8 0 pgrppl 48 60 0 38 1 0 1 1 0 8 0 ucredpl 104 410 0 392 1 0 1 1 0 8 0 zombiepl 144 545 0 544 1 0 1 1 0 8 0 processpl 1232 593 0 544 5 0 5 5 0 8 0 procpl 664 851 0 797 7 0 7 7 0 8 1 sockpl 752 582 0 519 11 0 11 11 0 8 4 mcl64k 65536 3 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 120 0 0 15 0 15 15 0 8 0 mcl2k 2048 17 0 0 3 0 3 3 0 8 0 mextrefs 64 9 0 0 1 0 1 1 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 1277 0 0 80 0 80 80 0 8 0 bufpl 272 2582 0 102 166 0 166 166 0 8 0 anonpl 32 7898 0 0 65 1 64 65 0 247 0 amapchunkpl 152 12422 0 11974 34 0 34 34 0 158 13 amappl16 200 1202 0 1168 16 6 10 14 0 8 8 amappl15 192 1 0 1 1 1 0 1 0 8 0 amappl14 184 407 0 406 1 0 1 1 0 8 0 amappl13 176 119 0 109 1 0 1 1 0 8 0 amappl12 168 836 0 804 2 0 2 2 0 8 0 amappl11 160 2 0 2 1 1 0 1 0 8 0 amappl10 152 56 0 46 1 0 1 1 0 8 0 amappl9 144 270 0 270 1 1 0 1 0 8 0 amappl8 136 121 0 119 1 0 1 1 0 8 0 amappl7 128 140 0 127 1 0 1 1 0 8 0 amappl6 120 148 0 147 1 0 1 1 0 8 0 amappl5 112 101 0 93 1 0 1 1 0 8 0 amappl4 104 268 0 251 1 0 1 1 0 8 0 amappl3 96 2391 0 2284 5 1 4 4 0 8 0 amappl2 88 537 0 482 2 0 2 2 0 8 0 amappl1 80 11563 0 11001 16 0 16 16 0 8 2 amappl 88 3582 0 3430 5 0 5 5 0 92 0 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 12 0 0 1 0 1 1 0 8 0 uaddrrnd 24 577 0 544 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 577 0 544 1 0 1 1 0 8 0 vmmpekpl 168 6886 0 6839 3 0 3 3 0 8 0 vmmpepl 168 45957 0 44081 104 0 104 104 0 357 13 vmsppl 488 576 0 544 7 1 6 6 0 8 0 rwobjpl 80 15814 0 14892 25 0 25 25 0 8 0 pdppl 4096 1161 0 1088 109 28 81 99 0 8 8 pvpl 32 16479 0 0 133 0 133 133 0 265 0 pmappl 256 576 0 544 4 1 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 516 0 31 14 0 14 14 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace amap_lookups(fffff00061f8f328,15000,ffff80003c3f39d0,8) at amap_lookups+0x1e0 amap_chunk_get sys/uvm/uvm_amap.c:118 [inline] amap_lookups(fffff00061f8f328,15000,ffff80003c3f39d0,8) at amap_lookups+0x1e0 sys/uvm/uvm_amap.c:1168 uvm_fault_check(ffff80003c3f3ad0,ffff80003c3f3b08,ffff80003c3f3b40,0) at uvm_fault_check+0x8d2 sys/uvm/uvm_fault.c:840 uvm_fault(fffff0006d073028,5172f99b000,0,1) at uvm_fault+0x106 sys/uvm/uvm_fault.c:627 upageflttrap(ffff80003c3f3c70,5172f99b940) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c3f3c70) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7228bc3464f0, count: -6 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff80002999dff0) 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 end of kernel end trace frame: 0x708d376c52b0, count: 12 ddb{1}> trace x86_ipi_db(ffff80002999dff0) 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 end of kernel end trace frame: 0x708d376c52b0, count: -3