uvm_fault(0xfffffd807efff450, 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 7015 45436 32767 0x10 0 0 syz-executor.1 *305463 45436 32767 0x10 0x4000000 1K syz-executor.1 uvm_fault_lower(ffff80002468d760,ffff80002468d798,ffff80002468d6e0,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efff450,20000000,0,1) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 kpageflttrap(ffff80002468d8f0,20000040) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff80002468d8f0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyin() at copyin+0x53 sys_poll(ffff80002125ba40,ffff80002468db38,ffff80002468db90) at sys_poll+0xa7 syscall(ffff80002468dc00) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002468dc00) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x666dfe0e000, count: 6 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(0xfffffd807efff450, 0x0, 0, 1) -> e ddb{1}> trace uvm_fault_lower(ffff80002468d760,ffff80002468d798,ffff80002468d6e0,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efff450,20000000,0,1) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 kpageflttrap(ffff80002468d8f0,20000040) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff80002468d8f0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyin() at copyin+0x53 sys_poll(ffff80002125ba40,ffff80002468db38,ffff80002468db90) at sys_poll+0xa7 syscall(ffff80002468dc00) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002468dc00) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x666dfe0e000, count: -9 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002468d650 rbx 0 rdx 0 rcx 0 rax 0xffff80002125ba40 r8 0xffffffff81a8edde witness_assert+0x1fe r9 0x5 r10 0xc7310e48fd3c9c70 r11 0x2d62e00be01ac3b0 r12 0xffff80002468d760 r13 0xfffffd8067418a68 r14 0 r15 0xffffffff81b25d00 uvn_flush+0x950 rip 0xffffffff817b9101 uvm_fault_lower+0xbb1 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002468d5c0 ss 0x10 uvm_fault_lower+0xbb1: movq 0(%rbx),%rdi ddb{1}> show proc PROC (syz-executor.1) pid=305463 stat=onproc flags process=10 proc=4000000 pri=36, usrpri=69, nice=20 forw=0xffffffffffffffff, list=0xffff80002125a2a0,0xffffffff82877af8 process=0xffff80002125c440 user=0xffff800024688000, vmspace=0xfffffd807efff450 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 45436 7015 70213 32767 7 0x10 syz-executor.1 *45436 305463 70213 32767 7 0x4000010 syz-executor.1 70213 32616 40309 32767 3 0x90 nanoslp syz-executor.1 40309 494465 69762 0 3 0x82 wait syz-executor.1 47257 249464 54228 32767 3 0x90 nanoslp syz-executor.0 54228 514732 69762 0 3 0x82 wait syz-executor.0 60226 168990 0 0 3 0x14200 bored sosplice 69762 308185 90985 0 3 0x82 thrsleep syz-fuzzer 69762 258386 90985 0 3 0x4000082 nanoslp syz-fuzzer 69762 48923 90985 0 3 0x4000082 thrsleep syz-fuzzer 69762 444795 90985 0 3 0x4000082 thrsleep syz-fuzzer 69762 389740 90985 0 3 0x4000082 thrsleep syz-fuzzer 69762 131429 90985 0 3 0x4000082 kqread syz-fuzzer 69762 514785 90985 0 3 0x4000082 thrsleep syz-fuzzer 69762 218538 90985 0 3 0x4000082 thrsleep syz-fuzzer 90985 203481 28400 0 3 0x10008a sigsusp ksh 28400 246142 56498 0 3 0x9a kqread sshd 18213 521840 1 0 3 0x100083 ttyin getty 56498 365653 1 0 3 0x88 kqread sshd 99896 388446 13289 73 3 0x100090 kqread syslogd 13289 109756 1 0 3 0x100082 netio syslogd 45721 55952 1 0 3 0x100080 kqread resolvd 91068 208818 94498 77 3 0x100092 kqread dhcpleased 76925 424177 94498 77 3 0x100092 kqread dhcpleased 94498 357206 1 0 3 0x80 kqread dhcpleased 99035 262510 0 0 3 0x14200 bored smr 84176 251109 0 0 3 0x14200 pgzero zerothread 24452 45351 0 0 3 0x14200 aiodoned aiodoned 62509 156760 0 0 3 0x14200 syncer update 75581 231254 0 0 3 0x14200 cleaner cleaner 48981 41732 0 0 3 0x14200 reaper reaper 98596 104549 0 0 3 0x14200 pgdaemon pagedaemon 4545 123321 0 0 3 0x14200 bored viomb 56673 320047 0 0 3 0x40014200 acpi0 acpi0 24173 239464 0 0 3 0x40014200 idle1 22929 168673 0 0 3 0x14200 bored softnet 16850 399924 0 0 3 0x14200 bored systqmp 26266 170911 0 0 3 0x14200 bored systq 53634 460833 0 0 3 0x40014200 bored softclock 41937 247128 0 0 3 0x40014200 idle0 1 217180 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 45436 (syz-executor.1) thread 0xffff80002125a2a0 (7015) shared rwlock vmmaplk r = 0 (0xfffffd807efff468) #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 Process 45436 (syz-executor.1) thread 0xffff80002125ba40 (305463) exclusive kernel_lock &kernel_lock r = 2 (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 kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 #9 kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 #10 alltraps_kern_meltdown+0x7b #11 copyin+0x53 #12 sys_poll+0xa7 #13 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #13 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #14 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10162 6396K 6416K 78643K 11314 0 pcb 13 16K 18K 78643K 19 0 rtable 114 3K 4K 78643K 1215 0 ifaddr 39 10K 10K 78643K 181 0 sysctl 3 1K 1K 78643K 3 0 counters 44 34K 34K 78643K 84 0 ioctlops 0 0K 2K 78643K 1490 0 iov 0 0K 24K 78643K 848 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1209 76K 76K 78643K 7089 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 92 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 1991 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 7 21K 33K 78643K 17481 0 sigio 0 0K 0K 78643K 171 0 proc 56 74K 87K 78643K 1572 0 subproc 26 1K 1K 78643K 286 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 1579 0 in_multi 33 2K 2K 78643K 580 0 ether_multi 1 0K 0K 78643K 120 0 mrt 1 0K 0K 78643K 2 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 289 1288K 1288K 78643K 289 0 exec 0 0K 2K 78643K 1761 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 312 37K 53K 78643K 225677 0 UVM aobj 131 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 382 0 NDP 5 0K 0K 78643K 69 0 temp 76 4195K 4323K 78643K 42634 0 kqueue 13 20K 26K 78643K 832 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 120 626 0 623 5 4 1 3 0 8 0 rtentry 112 286 0 238 2 0 2 2 0 8 0 unpcb 128 5802 0 5789 45 44 1 5 0 8 0 syncache 296 234 0 234 39 39 0 1 0 8 0 tcpqe 32 77 0 77 20 20 0 1 0 8 0 tcpcb 736 12419 0 12369 266 258 8 27 0 8 3 arp 120 49 0 42 1 0 1 1 0 8 0 ipq 40 26 0 26 8 8 0 1 0 8 0 ipqe 40 324 0 324 8 8 0 1 0 8 0 inpcb 304 17240 0 17224 185 178 7 17 0 8 5 rttmr 72 247 0 247 2 2 0 1 0 8 0 ip6q 72 13 0 13 6 6 0 1 0 8 0 ip6af 40 22 0 22 6 6 0 1 0 8 0 nd6 48 80 0 71 1 0 1 1 0 8 0 kcovpl 48 22 0 20 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1381 0 1132 28 12 16 19 0 8 0 art_table 32 1382 0 1132 3 0 3 3 0 8 0 art_node 16 285 0 241 1 0 1 1 0 8 0 sysvmsgpl 40 23 0 7 1 0 1 1 0 8 0 semupl 112 5 0 5 1 1 0 1 0 8 0 semapl 112 1984 0 1974 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 26638 0 25214 98 8 90 90 0 8 0 ffsino 272 26638 0 25214 98 2 96 96 0 8 0 nchpl 144 48770 0 47169 61 1 60 61 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 161822 0 161822 1 0 1 1 0 8 1 percpumem 16 54 0 20 1 0 1 1 0 8 0 scxspl 216 137282 0 137282 54 53 1 8 0 8 1 plimitpl 152 1984 0 1974 1 0 1 1 0 8 0 sigapl 424 17652 0 17619 4 0 4 4 0 8 0 futexpl 64 113542 0 113542 1 0 1 1 0 8 1 knotepl 112 173 0 0 3 1 2 3 0 8 0 kqueuepl 216 6115 0 6092 67 65 2 7 0 8 0 pipepl 336 3274 0 3264 106 102 4 7 0 8 3 fdescpl 496 17637 0 17619 4 1 3 3 0 8 0 filepl 152 110121 0 110019 130 123 7 14 0 8 3 lockfpl 104 1508 0 1506 2 1 1 2 0 8 0 lockfspl 48 518 0 516 1 0 1 1 0 8 0 sessionpl 144 37 0 27 1 0 1 1 0 8 0 pgrppl 48 113 0 103 1 0 1 1 0 8 0 ucredpl 96 32071 0 32059 1 0 1 1 0 8 0 zombiepl 144 17619 0 17618 1 0 1 1 0 8 0 processpl 1064 17652 0 17618 4 1 3 3 0 8 0 procpl 672 50853 0 50811 27 22 5 6 0 8 1 sosppl 168 192 0 192 27 27 0 1 0 8 0 sockpl 480 24011 0 23987 391 379 12 34 0 8 8 mcl64k 65536 24 0 0 3 1 2 3 0 8 0 mcl16k 16384 17 0 0 3 0 3 3 0 8 0 mcl12k 12288 25 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 33 0 0 4 1 3 3 0 8 0 mcl2k2 2112 14 0 0 1 0 1 1 0 8 0 mcl2k 2048 706 0 0 18 4 14 17 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 1038 0 0 25 0 25 25 0 8 0 bufpl 288 31062 0 24737 456 3 453 453 0 8 0 anonpl 24 5116074 0 5106957 315 253 62 91 0 186 0 amapchunkpl 152 548056 0 547616 100 81 19 32 0 158 0 amappl16 200 54541 0 54312 192 179 13 33 0 8 0 amappl15 192 730 0 725 1 0 1 1 0 8 0 amappl14 184 624 0 623 3 2 1 1 0 8 0 amappl13 176 4754 0 4751 1 0 1 1 0 8 0 amappl12 168 322 0 313 1 0 1 1 0 8 0 amappl11 160 4968 0 4952 1 0 1 1 0 8 0 amappl10 152 50 0 46 1 0 1 1 0 8 0 amappl9 144 3281 0 3279 1 0 1 1 0 8 0 amappl8 136 4981 0 4816 8 2 6 6 0 8 0 amappl7 128 3901 0 3891 1 0 1 1 0 8 0 amappl6 120 3180 0 3164 1 0 1 1 0 8 0 amappl5 112 11405 0 11387 1 0 1 1 0 8 0 amappl4 104 10594 0 10559 1 0 1 1 0 8 0 amappl3 96 3398 0 3379 1 0 1 1 0 8 0 amappl2 88 23281 0 23228 5 3 2 2 0 8 0 amappl1 80 301630 0 301198 12 2 10 12 0 8 0 amappl 88 224201 0 224050 4 0 4 4 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 72 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 17637 0 17619 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 17637 0 17619 1 0 1 1 0 8 0 vmmpekpl 168 119810 0 119781 2 0 2 2 0 8 0 vmmpepl 168 1628431 0 1626786 275 197 78 92 0 357 0 vmsppl 368 17636 0 17619 2 0 2 2 0 8 0 rwobjpl 56 397423 0 390293 138 37 101 106 0 8 0 pdppl 4096 35282 0 35238 72 26 46 50 0 8 2 pvpl 32 8457099 0 8444433 542 434 108 158 0 265 0 pmappl 248 17636 0 17619 2 0 2 2 0 8 0 extentpl 40 57 0 38 1 0 1 1 0 8 0 phpool 112 1190 0 419 23 0 23 23 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 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x1f __mp_lock(ffffffff828b6eb0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828b6eb0) at __mp_lock+0x122 sys/kern/kern_lock.c:147 syscall(ffff8000246ab9e0) at syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline] syscall(ffff8000246ab9e0) at syscall+0x3ef sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffeab70, count: 6 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 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x1f __mp_lock(ffffffff828b6eb0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828b6eb0) at __mp_lock+0x122 sys/kern/kern_lock.c:147 syscall(ffff8000246ab9e0) at syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline] syscall(ffff8000246ab9e0) at syscall+0x3ef sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffeab70, count: -9 ddb{0}> machine ddbcpu 1 Stopped at uvm_fault_lower+0xbb1: movq 0(%rbx),%rdi uvm_fault_lower(ffff80002468d760,ffff80002468d798,ffff80002468d6e0,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efff450,20000000,0,1) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 kpageflttrap(ffff80002468d8f0,20000040) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff80002468d8f0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyin() at copyin+0x53 sys_poll(ffff80002125ba40,ffff80002468db38,ffff80002468db90) at sys_poll+0xa7 syscall(ffff80002468dc00) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002468dc00) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x666dfe0e000, count: 6 ddb{1}> trace uvm_fault_lower(ffff80002468d760,ffff80002468d798,ffff80002468d6e0,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efff450,20000000,0,1) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 kpageflttrap(ffff80002468d8f0,20000040) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff80002468d8f0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyin() at copyin+0x53 sys_poll(ffff80002125ba40,ffff80002468db38,ffff80002468db90) at sys_poll+0xa7 syscall(ffff80002468dc00) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002468dc00) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x666dfe0e000, count: -9