uvm_fault(0xfffffd8075e271f0, 0x8, 0, 1) -> e kernel: page fault trap, code=0 Stopped at witness_checkorder+0x1ec: movl 0x8(%r14),%ebx TID PID UID PRFLAGS PFLAGS CPU COMMAND 29094 23706 0 0x14000 0x200 0 reaper witness_checkorder(fffffd806f167298,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f167288) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff80002121b2b8,fffffd806f167288,fffffd806f167310,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002121b2b8,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002121b2b8) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002121b2b8,0,0,1) at exit1+0x3ff sys/kern/kern_exit.c:206 sys_exit(ffff80002121b2b8,ffff8000212a5400,ffff8000212a5450) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000212a54d0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000212a54d0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c0434f0ebd0, 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(0xfffffd8075e271f0, 0x8, 0, 1) -> e ddb{1}> trace witness_checkorder(fffffd806f167298,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f167288) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff80002121b2b8,fffffd806f167288,fffffd806f167310,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002121b2b8,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002121b2b8) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002121b2b8,0,0,1) at exit1+0x3ff sys/kern/kern_exit.c:206 sys_exit(ffff80002121b2b8,ffff8000212a5400,ffff8000212a5450) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000212a54d0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000212a54d0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c0434f0ebd0, count: -9 ddb{1}> show registers rdi 0 rsi 0x20000 acpi_pdirpa+0xbe63 rbp 0xffff8000212a51a0 rbx 0xe rdx 0 rcx 0xfffffd80037e45e0 rax 0xffff800020d58ff0 r8 0x1 r9 0x1 r10 0x56c69e8cf696aaad r11 0xb539ca2536a091f2 r12 0 r13 0xfffffd806f167298 r14 0 r15 0xffff80002121b2b8 rip 0xffffffff81b8d00c witness_checkorder+0x1ec cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff8000212a50f0 ss 0x10 witness_checkorder+0x1ec: movl 0x8(%r14),%ebx ddb{1}> show proc PROC (syz-executor1550576242) pid=300086 stat=onproc flags process=1008 proc=2000 pri=0, usrpri=57, nice=20 forw=0xffffffffffffffff, list=0xffff80002120cd60,0xffff80002121ad78 process=0xffff8000212ad0d8 user=0xffff8000212a0000, vmspace=0xfffffd8075e271f0 estcpu=7, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 62319 378202 95035 0 2 0 syz-executor1550576242 37834 41484 97503 0 2 0 syz-executor1550576242 629 306625 85796 0 2 0 syz-executor1550576242 34845 226832 82036 0 2 0 syz-executor1550576242 79631 312844 31165 0 2 0 syz-executor1550576242 9887 4247 74417 0 2 0 syz-executor1550576242 9887 385988 74417 0 3 0x4000080 fsleep syz-executor1550576242 85198 493741 12420 0 2 0 syz-executor1550576242 31165 406695 93385 0 3 0x80 nanoslp syz-executor1550576242 12420 265678 93385 0 3 0x80 nanoslp syz-executor1550576242 95035 340957 93385 0 3 0x80 nanoslp syz-executor1550576242 74417 144957 93385 0 3 0x80 nanoslp syz-executor1550576242 68117 465235 93385 0 3 0x80 nanoslp syz-executor1550576242 82036 395713 93385 0 2 0 syz-executor1550576242 97503 13525 93385 0 3 0x80 nanoslp syz-executor1550576242 85796 77724 93385 0 3 0x80 nanoslp syz-executor1550576242 93385 329886 62165 0 3 0x82 nanoslp syz-executor1550576242 62165 339847 55942 0 3 0x10008a sigsusp ksh 55942 253390 32828 0 3 0x9a kqread sshd 64571 402143 1 0 3 0x100083 ttyin getty 32828 503628 1 0 3 0x88 kqread sshd 49698 332101 96697 73 3 0x1100090 kqread syslogd 96697 437824 1 0 3 0x100082 netio syslogd 2757 377295 1 0 3 0x100080 kqread resolvd 29565 271742 96901 77 3 0x100092 kqread dhcpleased 92524 120300 96901 77 3 0x100092 kqread dhcpleased 96901 398646 1 0 3 0x80 kqread dhcpleased 43459 278867 0 0 3 0x14200 bored smr 49442 5075 0 0 2 0x14200 zerothread 27730 216215 0 0 3 0x14200 aiodoned aiodoned 86217 142195 0 0 3 0x14200 syncer update 45283 151 0 0 3 0x14200 cleaner cleaner 23706 29094 0 0 7 0x14200 reaper 17254 461588 0 0 3 0x14200 pgdaemon pagedaemon 22523 372893 0 0 3 0x14200 bored viomb 67623 257500 0 0 3 0x40014200 acpi0 acpi0 23243 494497 0 0 3 0x40014200 idle1 8845 225865 0 0 3 0x14200 bored softnet3 60659 373275 0 0 3 0x14200 bored softnet2 5440 96056 0 0 3 0x14200 bored softnet1 77364 368056 0 0 3 0x14200 bored softnet0 1379 225733 0 0 3 0x14200 bored systqmp 10098 375844 0 0 3 0x14200 bored systq 12037 364934 0 0 3 0x40014200 bored softclock 35759 234889 0 0 3 0x40014200 idle0 1 126698 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive sched_lock &sched_lock r = 0 (0xffffffff82cdefb0) #0 witness_lock+0x447 #1 preempt+0x37 sys/kern/sched_bsd.c:340 #2 ast+0x109 mi_ast sys/sys/syscall_mi.h:192 [inline] #2 ast+0x109 sys/arch/amd64/amd64/trap.c:541 #3 Xsyscall+0x156 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10156 6389K 6420K 78643K 11234 0 pcb 13 8K 8K 78643K 13 0 rtable 58 1K 2K 78643K 110 0 pf 12 6K 6K 78643K 12 0 ifaddr 12 9K 9K 78643K 12 0 ifgroup 17 1K 1K 78643K 17 0 counters 44 33K 33K 78643K 44 0 ioctlops 0 0K 2K 78643K 21 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1174 73K 74K 78643K 1187 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 1K 1K 78643K 2 0 sem 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 1 0K 0K 78643K 1 0 proc 55 78K 79K 78643K 246 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 11 0K 0K 78643K 11 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 25 122K 122K 78643K 25 0 exec 0 0K 1K 78643K 243 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 8 62K 64K 78643K 10 0 UVM amap 111 6K 7K 78643K 4670 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 3 0K 0K 78643K 3 0 temp 1 5904K 5968K 78643K 2836 0 kqueue 12 18K 24K 78643K 437 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 20 0 17 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 144 33 0 20 1 0 1 1 0 8 0 syncache 304 5 0 5 2 1 1 1 0 8 1 tcpqe 32 145 0 145 1 1 0 1 0 8 0 tcpcb 808 8 0 5 1 0 1 1 0 8 0 arp 120 2 0 0 1 0 1 1 0 8 0 inpcb 368 440 0 432 2 0 2 2 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 96 0 0 6 0 6 6 0 8 0 art_table 32 97 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1422 0 37 87 0 87 87 0 8 0 ffsino 272 1422 0 37 93 0 93 93 0 8 0 nchpl 144 1606 0 47 58 0 58 58 0 8 0 uvmvnodes 80 1431 0 0 30 0 30 30 0 8 0 vnodes 216 1431 0 0 80 0 80 80 0 8 0 namei 1024 4256 0 4256 2 1 1 1 0 8 1 percpumem 16 35 0 0 1 0 1 1 0 8 0 kstatmem 264 6 0 0 1 0 1 1 0 8 0 scxspl 216 5148 0 5148 10 9 1 8 1 8 1 plimitpl 152 16 0 10 1 0 1 1 0 8 0 sigapl 424 737 0 691 6 0 6 6 0 8 0 futexpl 64 827 0 826 1 0 1 1 0 8 0 knotepl 120 49 0 0 2 0 2 2 0 8 0 kqueuepl 216 434 0 426 1 0 1 1 0 8 0 pipepl 320 87 0 84 2 1 1 1 0 8 0 fdescpl 496 720 0 691 5 1 4 4 0 8 0 filepl 152 1540 0 1485 3 0 3 3 0 8 0 lockfpl 104 6 0 4 1 0 1 1 0 8 0 lockfspl 48 4 0 2 1 0 1 1 0 8 0 sessionpl 144 17 0 9 1 0 1 1 0 8 0 pgrppl 48 17 0 9 1 0 1 1 0 8 0 ucredpl 104 66 0 56 1 0 1 1 0 8 0 zombiepl 144 692 0 691 2 1 1 1 0 8 0 processpl 1072 737 0 691 4 0 4 4 0 8 0 procpl 680 1159 0 1112 5 0 5 5 0 8 0 sockpl 488 493 0 469 4 0 4 4 0 8 1 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 303 0 0 35 3 32 35 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 343 0 0 19 1 18 19 0 8 0 bufpl 288 2510 0 88 173 0 173 173 0 8 0 anonpl 24 180796 0 178874 25 12 13 23 0 186 0 amapchunkpl 152 15398 0 15216 12 1 11 11 0 158 2 amappl16 200 4967 0 4965 6 5 1 5 0 8 0 amappl15 192 13 0 13 1 1 0 1 0 8 0 amappl14 184 100 0 91 1 0 1 1 0 8 0 amappl13 176 8 0 8 1 1 0 1 0 8 0 amappl12 168 1201 0 1187 1 0 1 1 0 8 0 amappl11 160 49 0 39 1 0 1 1 0 8 0 amappl10 152 16 0 16 2 1 1 1 0 8 1 amappl9 144 192 0 192 1 1 0 1 0 8 0 amappl8 136 41 0 39 1 0 1 1 0 8 0 amappl7 128 450 0 436 1 0 1 1 0 8 0 amappl6 120 136 0 123 1 0 1 1 0 8 0 amappl5 112 106 0 98 1 0 1 1 0 8 0 amappl4 104 412 0 384 1 0 1 1 0 8 0 amappl3 96 3746 0 3712 2 0 2 2 0 8 1 amappl2 88 878 0 833 3 1 2 2 0 8 0 amappl1 80 11084 0 10630 15 4 11 11 0 8 0 amappl 88 4399 0 4326 3 0 3 3 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 720 0 691 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 720 0 691 1 0 1 1 0 8 0 vmmpekpl 168 8744 0 8723 2 0 2 2 0 8 0 vmmpepl 168 47874 0 46693 64 7 57 57 0 357 5 vmsppl 464 719 0 691 5 1 4 4 0 8 0 rwobjpl 56 23119 0 21051 32 1 31 31 0 8 1 pdppl 4096 1448 0 1382 88 22 66 66 0 8 0 pvpl 32 295893 0 291241 63 22 41 52 0 265 3 pmappl 248 719 0 691 3 1 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 520 0 29 15 0 15 15 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffffffff82bffff0) at x86_ipi_db+0x1e 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+0x27 __mp_lock(ffffffff82cd6528) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82cd6528) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff8000211b9660,ffff80000067b300) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge26_untramp() at Xintr_ioapic_edge26_untramp+0x18f mtx_enter_try(ffffffff82b722d0) at mtx_enter_try+0x19 sys/kern/kern_lock.c:282 mtx_enter(ffffffff82b722d0) at mtx_enter+0x4f sys/kern/kern_lock.c:266 msleep(ffffffff82c98a58,ffffffff82b722d0,4,ffffffff828590ec,0) at msleep+0x1f1 sys/kern/kern_synch.c:239 reaper(ffff8000211b3548) at reaper+0xdb sys/kern/kern_exit.c:435 end trace frame: 0x0, count: 5 ddb{0}> trace x86_ipi_db(ffffffff82bffff0) at x86_ipi_db+0x1e 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+0x27 __mp_lock(ffffffff82cd6528) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82cd6528) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff8000211b9660,ffff80000067b300) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge26_untramp() at Xintr_ioapic_edge26_untramp+0x18f mtx_enter_try(ffffffff82b722d0) at mtx_enter_try+0x19 sys/kern/kern_lock.c:282 mtx_enter(ffffffff82b722d0) at mtx_enter+0x4f sys/kern/kern_lock.c:266 msleep(ffffffff82c98a58,ffffffff82b722d0,4,ffffffff828590ec,0) at msleep+0x1f1 sys/kern/kern_synch.c:239 reaper(ffff8000211b3548) at reaper+0xdb sys/kern/kern_exit.c:435 end trace frame: 0x0, count: -10 ddb{0}> machine ddbcpu 1 Stopped at witness_checkorder+0x1ec: movl 0x8(%r14),%ebx witness_checkorder(fffffd806f167298,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f167288) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff80002121b2b8,fffffd806f167288,fffffd806f167310,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002121b2b8,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002121b2b8) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002121b2b8,0,0,1) at exit1+0x3ff sys/kern/kern_exit.c:206 sys_exit(ffff80002121b2b8,ffff8000212a5400,ffff8000212a5450) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000212a54d0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000212a54d0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c0434f0ebd0, count: 6 ddb{1}> trace witness_checkorder(fffffd806f167298,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f167288) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff80002121b2b8,fffffd806f167288,fffffd806f167310,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002121b2b8,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002121b2b8) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002121b2b8,0,0,1) at exit1+0x3ff sys/kern/kern_exit.c:206 sys_exit(ffff80002121b2b8,ffff8000212a5400,ffff8000212a5450) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000212a54d0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000212a54d0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c0434f0ebd0, count: -9