uvm_fault(0xfffffd807efffcf0, 0x0, 0, 1) -> e kernel: page fault trap, code=0 Stopped at uvm_fault_lower+0xbb1: movq 0(%rbx),%rdi TID PID UID PRFLAGS PFLAGS CPU COMMAND *404492 49327 32767 0x10 0 1K syz-executor.0 263456 49327 32767 0x10 0x4000000 0 syz-executor.0 uvm_fault_lower(ffff8000246b61f0,ffff8000246b6228,ffff8000246b6170,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efffcf0,20002000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff8000246b6360,20002000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff8000246b6360) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffd2c10, count: 10 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(0xfffffd807efffcf0, 0x0, 0, 1) -> e ddb{1}> trace uvm_fault_lower(ffff8000246b61f0,ffff8000246b6228,ffff8000246b6170,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efffcf0,20002000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff8000246b6360,20002000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff8000246b6360) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffd2c10, count: -5 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff8000246b60e0 rbx 0 rdx 0 rcx 0 rax 0xffff8000fffee540 r8 0xffffffff81a8edde witness_assert+0x1fe r9 0x5 r10 0x882179cffcc67625 r11 0x23cbbb690a0b7a r12 0xffff8000246b61f0 r13 0xfffffd806f899540 r14 0 r15 0xffffffff81b25d00 uvn_flush+0x950 rip 0xffffffff817b9101 uvm_fault_lower+0xbb1 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff8000246b6050 ss 0 uvm_fault_lower+0xbb1: movq 0(%rbx),%rdi ddb{1}> show proc PROC (syz-executor.0) pid=404492 stat=onproc flags process=10 proc=0 pri=36, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffefa40,0xffff8000fffee2b0 process=0xffff8000ffffa148 user=0xffff8000246b1000, vmspace=0xfffffd807efffcf0 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *49327 404492 72015 32767 7 0x10 syz-executor.0 49327 317340 72015 32767 3 0x4000090 fsleep syz-executor.0 49327 263456 72015 32767 7 0x4000010 syz-executor.0 95938 321686 13997 32767 2 0x10 syz-executor.1 95938 513634 13997 32767 3 0x4000090 netcon2 syz-executor.1 13997 358377 82517 32767 3 0x90 nanoslp syz-executor.1 82517 458704 80913 0 3 0x82 wait syz-executor.1 72015 117563 62264 32767 3 0x90 nanoslp syz-executor.0 62264 52431 80913 0 3 0x82 wait syz-executor.0 97243 218815 0 0 3 0x14200 bored sosplice 80913 64852 73192 0 3 0x82 thrsleep syz-fuzzer 80913 354408 73192 0 3 0x4000082 thrsleep syz-fuzzer 80913 472839 73192 0 3 0x4000082 kqread syz-fuzzer 80913 180812 73192 0 3 0x4000082 thrsleep syz-fuzzer 80913 412137 73192 0 3 0x4000082 thrsleep syz-fuzzer 80913 254122 73192 0 3 0x4000082 thrsleep syz-fuzzer 80913 117317 73192 0 3 0x4000082 thrsleep syz-fuzzer 80913 43810 73192 0 3 0x4000082 thrsleep syz-fuzzer 80913 290100 73192 0 3 0x4000082 thrsleep syz-fuzzer 73192 382898 20322 0 3 0x10008a sigsusp ksh 20322 336547 89684 0 3 0x9a kqread sshd 40890 93 1 0 3 0x100083 ttyin getty 89684 164879 1 0 3 0x88 kqread sshd 20569 395929 65352 73 3 0x100090 kqread syslogd 65352 266465 1 0 3 0x100082 netio syslogd 3486 214971 1 0 3 0x100080 kqread resolvd 6696 511688 39779 77 3 0x100092 kqread dhcpleased 78479 291773 39779 77 3 0x100092 kqread dhcpleased 39779 72623 1 0 3 0x80 kqread dhcpleased 84165 418803 0 0 3 0x14200 bored smr 67153 423577 0 0 2 0x14200 zerothread 16103 225878 0 0 3 0x14200 aiodoned aiodoned 89931 521793 0 0 3 0x14200 syncer update 83733 87727 0 0 3 0x14200 cleaner cleaner 8185 276880 0 0 3 0x14200 reaper reaper 63844 230604 0 0 3 0x14200 pgdaemon pagedaemon 67244 151013 0 0 3 0x14200 bored viomb 79482 446773 0 0 3 0x40014200 acpi0 acpi0 35819 251478 0 0 3 0x40014200 idle1 61080 7730 0 0 3 0x14200 bored softnet 94135 464398 0 0 3 0x14200 bored systqmp 22756 203253 0 0 3 0x14200 bored systq 88815 521581 0 0 3 0x40014200 bored softclock 90057 378248 0 0 3 0x40014200 idle0 1 481285 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 49327 (syz-executor.0) thread 0xffff8000fffee540 (404492) exclusive kernel_lock &kernel_lock r = 1 (0xffffffff828b70b8) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 __mp_acquire_count+0x4c sys/kern/kern_lock.c:227 #2 mi_switch+0x3d3 sys/kern/sched_bsd.c:416 #3 sleep_finish+0x1b2 sys/kern/kern_synch.c:433 #4 rw_enter+0x35b sys/kern/kern_rwlock.c:286 #5 uvmfault_relock+0x6f sys/uvm/uvm_fault.c:1801 #6 uvm_fault_lower+0x931 sys/uvm/uvm_fault.c:1288 #7 uvm_fault+0x24f sys/uvm/uvm_fault.c:640 #8 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #9 usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 #10 recall_trap+0x8 Process 49327 (syz-executor.0) thread 0xffff8000fffee000 (263456) shared rwlock vmmaplk r = 0 (0xfffffd807efffd08) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 uvm_map_inentry_fix+0xa7 vm_map_lock_read_ln sys/uvm/uvm_map.c:5480 [inline] #1 uvm_map_inentry_fix+0xa7 sys/uvm/uvm_map.c:1886 #2 uvm_map_inentry+0xc5 sys/uvm/uvm_map.c:1917 #3 syscall+0x3d1 mi_syscall sys/sys/syscall_mi.h:87 [inline] #3 syscall+0x3d1 sys/arch/amd64/amd64/trap.c:585 #4 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10161 6395K 6416K 78643K 11475 0 pcb 13 16K 20K 78643K 19 0 rtable 108 3K 4K 78643K 5788 0 ifaddr 39 11K 12K 78643K 561 0 sysctl 3 1K 1K 78643K 3 0 counters 44 34K 34K 78643K 192 0 ioctlops 0 0K 2K 78643K 460 0 iov 0 0K 24K 78643K 5907 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1209 76K 76K 78643K 11435 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 451 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 10419 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 8 25K 33K 78643K 47940 0 sigio 0 0K 0K 78643K 923 0 proc 56 74K 99K 78643K 5229 0 subproc 26 1K 1K 78643K 988 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 1 0K 0K 78643K 25618 0 in_multi 33 2K 2K 78643K 1461 0 ether_multi 1 0K 0K 78643K 203 0 mrt 1 0K 0K 78643K 4 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 283 1261K 1261K 78643K 283 0 exec 0 0K 2K 78643K 7876 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 348 37K 53K 78643K 631653 0 UVM aobj 131 4K 4K 78643K 149 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 1292 0 NDP 5 0K 0K 78643K 231 0 temp 76 4195K 4307K 78643K 115561 0 kqueue 15 24K 36K 78643K 3381 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 5882 0 5879 85 84 1 5 0 8 0 rtentry 112 934 0 889 2 0 2 2 0 8 0 unpcb 128 42392 0 42379 389 384 5 9 0 8 4 syncache 296 416 0 416 104 103 1 1 0 8 1 tcpqe 32 216 0 216 54 54 0 1 0 8 0 tcpcb 736 55852 0 55839 1201 1196 5 27 0 8 3 arp 120 169 0 162 1 0 1 1 0 8 0 ipq 40 115 0 114 29 28 1 1 0 8 0 ipqe 40 801 0 800 29 28 1 1 0 8 0 inpcb 304 84252 0 84239 805 801 4 18 0 8 2 rttmr 72 152 0 152 5 5 0 1 0 8 0 ip6q 72 260 0 260 24 24 0 1 0 8 0 ip6af 40 521 0 521 24 24 0 1 0 8 0 nd6 48 282 0 276 1 0 1 1 0 8 0 kcovpl 48 76 0 74 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 4033 0 3842 39 25 14 17 0 8 0 art_table 32 4034 0 3842 5 3 2 3 0 8 0 art_node 16 933 0 892 1 0 1 1 0 8 0 sysvmsgpl 40 17 0 11 1 0 1 1 0 8 0 semapl 112 10417 0 10407 1 0 1 1 0 8 0 shmpl 112 146 0 18 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 64934 0 63439 99 5 94 94 0 8 0 ffsino 272 64934 0 63439 100 0 100 100 0 8 0 nchpl 144 127800 0 126198 60 0 60 60 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 224 5926 0 0 349 0 349 349 0 8 0 namei 1024 431156 0 431156 15 14 1 1 0 8 1 percpumem 16 108 0 74 1 0 1 1 0 8 0 scxspl 216 387163 0 387163 138 137 1 8 0 8 1 plimitpl 152 11213 0 11203 1 0 1 1 0 8 0 sigapl 424 47940 0 47906 4 0 4 4 0 8 0 futexpl 64 388265 0 388264 16 15 1 1 0 8 0 knotepl 112 757 0 0 4 1 3 4 0 8 0 kqueuepl 216 19301 0 19246 342 335 7 12 0 8 3 pipepl 336 11173 0 11163 395 393 2 11 0 8 1 fdescpl 496 47925 0 47906 3 0 3 3 0 8 0 filepl 152 363535 0 363430 643 633 10 14 0 8 5 lockfpl 104 6913 0 6910 3 2 1 2 0 8 0 lockfspl 48 2030 0 2027 1 0 1 1 0 8 0 sessionpl 144 91 0 81 1 0 1 1 0 8 0 pgrppl 48 465 0 455 1 0 1 1 0 8 0 ucredpl 96 61768 0 61756 1 0 1 1 0 8 0 zombiepl 144 47906 0 47906 1 0 1 1 0 8 1 processpl 1064 47940 0 47906 3 0 3 3 0 8 0 procpl 672 151433 0 151388 66 61 5 6 0 8 1 srpgc 96 6 0 6 3 3 0 1 0 8 0 sosppl 168 611 0 611 88 88 0 1 0 8 0 sockpl 480 134025 0 133999 2267 2256 11 34 0 8 7 mcl64k 65536 99 0 0 3 0 3 3 0 8 0 mcl16k 16384 78 0 0 6 4 2 3 0 8 0 mcl12k 12288 153 0 0 4 2 2 2 0 8 0 mcl9k 9216 41 0 0 2 0 2 2 0 8 0 mcl8k 8192 81 0 0 5 2 3 3 0 8 0 mcl4k 4096 41 0 0 4 1 3 3 0 8 0 mcl2k2 2112 17 0 0 2 0 2 2 0 8 0 mcl2k 2048 621 0 0 20 8 12 20 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 13499 0 0 840 0 840 840 0 8 0 bufpl 288 84943 0 78618 454 1 453 453 0 8 0 anonpl 24 14483344 0 14470697 950 854 96 108 0 186 7 amapchunkpl 152 1582902 0 1582310 461 436 25 41 0 158 0 amappl16 200 150089 0 149699 852 823 29 34 0 8 8 amappl15 192 7847 0 7842 1 0 1 1 0 8 0 amappl14 184 7064 0 7061 1 0 1 1 0 8 0 amappl13 176 6759 0 6757 1 0 1 1 0 8 0 amappl12 168 3497 0 3494 1 0 1 1 0 8 0 amappl11 160 1758 0 1744 1 0 1 1 0 8 0 amappl10 152 4739 0 4738 1 0 1 1 0 8 0 amappl9 144 14416 0 14412 1 0 1 1 0 8 0 amappl8 136 4673 0 4493 8 1 7 7 0 8 0 amappl7 128 2737 0 2728 1 0 1 1 0 8 0 amappl6 120 14542 0 14526 1 0 1 1 0 8 0 amappl5 112 51434 0 51417 1 0 1 1 0 8 0 amappl4 104 5832 0 5801 5 4 1 2 0 8 0 amappl3 96 7853 0 7832 1 0 1 1 0 8 0 amappl2 88 57427 0 57378 8 6 2 2 0 8 0 amappl1 80 838614 0 838171 12 2 10 12 0 8 0 amappl 88 628407 0 628220 5 0 5 5 0 92 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 72 148 0 18 3 0 3 3 0 8 0 uaddrrnd 24 47925 0 47906 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 47925 0 47906 1 0 1 1 0 8 0 vmmpekpl 168 370180 0 370155 2 0 2 2 0 8 0 vmmpepl 168 4462498 0 4460589 867 767 100 111 0 357 7 vmsppl 368 47924 0 47906 2 0 2 2 0 8 0 rwobjpl 56 1111731 0 1104409 157 50 107 107 0 8 0 pdppl 4096 95858 0 95812 88 42 46 50 0 8 0 pvpl 32 23483068 0 23466629 1752 1587 165 207 0 265 18 pmappl 248 47924 0 47906 2 0 2 2 0 8 0 extentpl 40 57 0 38 1 0 1 1 0 8 0 phpool 112 3278 0 1693 46 0 46 46 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff827adff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff828b6eb0) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828b6eb0) at __mp_lock+0x129 sys/kern/kern_lock.c:147 syscall(ffff8000246c82c0) at syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline] syscall(ffff8000246c82c0) at syscall+0x3ef sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xeff287ed5d0, count: 9 ddb{0}> trace x86_ipi_db(ffffffff827adff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff828b6eb0) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828b6eb0) at __mp_lock+0x129 sys/kern/kern_lock.c:147 syscall(ffff8000246c82c0) at syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline] syscall(ffff8000246c82c0) at syscall+0x3ef sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xeff287ed5d0, count: -6 ddb{0}> machine ddbcpu 1 Stopped at uvm_fault_lower+0xbb1: movq 0(%rbx),%rdi uvm_fault_lower(ffff8000246b61f0,ffff8000246b6228,ffff8000246b6170,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efffcf0,20002000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff8000246b6360,20002000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff8000246b6360) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffd2c10, count: 10 ddb{1}> trace uvm_fault_lower(ffff8000246b61f0,ffff8000246b6228,ffff8000246b6170,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efffcf0,20002000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff8000246b6360,20002000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff8000246b6360) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffd2c10, count: -5