uvm_fault(0xffff800001c5c5d0, 0x8, 0, 1) -> e kernel: page fault trap, code=0 Stopped at knote_processfork+0x287: movq 0x8(%r15),%r14 TID PID UID PRFLAGS PFLAGS CPU COMMAND 518395 22954 0 0 0 1 syz-executor * 5802 22954 0 0 0x4000000 0 syz-executor knote_processfork(ffffffff855596c0,8ade) at knote_processfork+0x287 sys/kern/kern_event.c:2246 fork1(ffffffff85559360,f0,ffffffff83dc4990,0,0,ffff80002fad4120) at fork1+0x1225 sys/kern/kern_fork.c:511 kthread_create(ffffffff83dc4990,0,ffffffff85e3fc20,ffffffff84d16b00) at kthread_create+0xa8 sys/kern/kern_kthread.c:61 sys_acct(ffff800035301cb0,ffff80002fad4500,ffff80002fad4460) at sys_acct+0x35e acct_start sys/kern/kern_acct.c:300 [inline] sys_acct(ffff800035301cb0,ffff80002fad4500,ffff80002fad4460) at sys_acct+0x35e sys/kern/kern_acct.c:151 syscall(ffff80002fad4500) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002fad4500) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x17829bf7ba0, 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(0xffff800001c5c5d0, 0x8, 0, 1) -> e ddb{0}> show kasan kasan: no report recorded this boot ddb{0}> trace knote_processfork(ffffffff855596c0,8ade) at knote_processfork+0x287 sys/kern/kern_event.c:2246 fork1(ffffffff85559360,f0,ffffffff83dc4990,0,0,ffff80002fad4120) at fork1+0x1225 sys/kern/kern_fork.c:511 kthread_create(ffffffff83dc4990,0,ffffffff85e3fc20,ffffffff84d16b00) at kthread_create+0xa8 sys/kern/kern_kthread.c:61 sys_acct(ffff800035301cb0,ffff80002fad4500,ffff80002fad4460) at sys_acct+0x35e acct_start sys/kern/kern_acct.c:300 [inline] sys_acct(ffff800035301cb0,ffff80002fad4500,ffff80002fad4460) at sys_acct+0x35e sys/kern/kern_acct.c:151 syscall(ffff80002fad4500) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002fad4500) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x17829bf7ba0, count: -6 ddb{0}> show registers rdi 0x8 rsi 0x1 rbp 0xffff80002fad3ff0 rbx 0xffff800001e1a5d2 rdx 0 rcx 0xffffffff85311ff0 cpu_info_full_primary+0x1ff0 rax 0x1 r8 0x8 r9 0x1 r10 0 r11 0xffffffff81eb7160 filt_proc r12 0xffff80002fad3ea0 r13 0xffff80002fad3ea0 r14 0xffffffff85559800 process0+0x140 r15 0 rip 0xffffffff81ec5577 knote_processfork+0x287 cs 0x8 rflags 0x10286 __ALIGN_SIZE+0xf286 rsp 0xffff80002fad3e40 ss 0x10 knote_processfork+0x287: movq 0x8(%r15),%r14 ddb{0}> show proc PROC (syz-executor) tid=5802 pid=22954 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=71, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800035301780,0xffff800035301a28 process=0xffff800045ff1838 user=0xffff80002fac9000, vmspace=0xffff800001c5c5d0 estcpu=21, cpticks=4, pctcpu=0.0, user=0, sys=4, intr=0 ddb{0}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 35550 487763 0 0 2 0x14000 0x200 swapper 2853 194222 12842 0 2 0x100000 0 sh 12842 344380 64293 0 3 0x100002 0x88 sigsusp sh 44936 414677 89400 0 2 0 0 syz-executor 44936 247508 89400 0 3 0 0x4000080 fsleep syz-executor 45281 118355 56016 0 2 0 0 syz-executor 45281 298912 56016 0 2 0 0x4000000 syz-executor 45281 412929 56016 0 3 0 0x4000080 fsleep syz-executor 22954 518395 41116 0 7 0 0 syz-executor 22954 410149 41116 0 3 0 0x4000080 fsleep syz-executor *22954 5802 41116 0 7 0 0x4000000 syz-executor 22954 391008 41116 0 3 0 0x4000080 fsleep syz-executor 64293 442229 75938 0 3 0x2 0x80 wait syz-executor 97626 342447 0 0 3 0x14000 0x280 nfsidl nfsio 13376 93620 0 0 3 0x14000 0x280 nfsidl nfsio 55048 102472 0 0 3 0x14000 0x280 nfsidl nfsio 78982 131968 0 0 3 0x14000 0x280 nfsidl nfsio 28236 48324 0 0 3 0x14000 0x280 nfsidl nfsio 30818 40453 0 0 3 0x14000 0x280 nfsidl nfsio 80038 417422 0 0 3 0x14000 0x280 nfsidl nfsio 92174 331202 0 0 3 0x14000 0x280 nfsidl nfsio 95182 91938 0 0 3 0x14000 0x280 nfsidl nfsio 43135 237550 0 0 3 0x14000 0x280 nfsidl nfsio 33300 260820 0 0 3 0x14000 0x280 nfsidl nfsio 95823 355183 0 0 3 0x14000 0x280 nfsidl nfsio 4526 218242 0 0 3 0x14000 0x280 nfsidl nfsio 1631 178222 0 0 3 0x14000 0x280 nfsidl nfsio 54571 357550 0 0 3 0x14000 0x280 nfsidl nfsio 46569 109582 0 0 3 0x14000 0x280 nfsidl nfsio 70194 371000 0 0 3 0x14000 0x280 nfsidl nfsio 27182 68020 0 0 3 0x14000 0x280 nfsidl nfsio 37426 5638 0 0 3 0x14000 0x280 nfsidl nfsio 7018 103039 0 0 3 0x14000 0x280 nfsidl nfsio 42159 378517 1 0 3 0x100003 0x80 ttyin getty 71611 396896 9906 0 3 0x100002 0x80 sbwait arp 9906 309176 34965 0 3 0x100002 0x88 sigsusp sh 32990 432750 75938 0 3 0x2 0x80 wait syz-executor 34965 82785 75938 0 3 0x2 0x80 wait syz-executor 41116 136825 75938 0 3 0x2 0x80 nanoslp syz-executor 56016 274015 75938 0 2 0x2 0 syz-executor 89400 17091 75938 0 3 0x2 0x80 nanoslp syz-executor 49425 28974 75938 0 3 0x2 0x80 piperd syz-executor 75938 418606 14217 0 3 0x2 0x80 nanoslp syz-executor 14217 117120 66469 0 3 0x100002 0x88 sigsusp ksh 66469 449377 51211 0 3 0x10 0x88 kqread sshd-session 51211 54527 64066 0 3 0x12 0x80 kqread sshd-session 64066 2220 1 0 3 0 0x88 kqread sshd 11939 365693 67789 74 3 0x1100012 0x80 bpf pflogd 67789 71352 1 0 3 0 0x80 sbwait pflogd 34834 222947 66906 73 3 0x1100010 0x80 kqread syslogd 66906 208656 1 0 3 0x100002 0x80 sbwait syslogd 41552 482673 1 0 3 0x100000 0x80 kqread resolvd 8143 311195 81646 77 3 0x100012 0x80 kqread dhcpleased 95317 161604 81646 77 3 0x100012 0x80 kqread dhcpleased 81646 463710 1 0 3 0 0x80 kqread dhcpleased 10981 343309 0 0 3 0x14000 0x200 bored smr 77218 335524 0 0 2 0x14000 0x200 zerothread 86939 295415 0 0 3 0x14000 0x200 aiodoned aiodoned 50943 207413 0 0 3 0x14000 0x200 syncer update 85926 362996 0 0 3 0x14000 0x200 cleaner cleaner 88927 77660 0 0 3 0x14000 0x200 reaper reaper 71649 508484 0 0 3 0x14000 0x200 pgdaemon pagedaemon 18686 498077 0 0 3 0x14000 0x200 bored viomb 3030 19996 0 0 3 0x14000 0x40000200 acpi0 acpi0 63212 5528 0 0 3 0x14000 0x40000200 idle1 50442 18364 0 0 3 0x14000 0x200 bored softnet1 49731 71823 0 0 3 0x14000 0x200 bored softnet0 35997 377195 0 0 3 0x14000 0x200 bored systqmp 91545 335330 0 0 3 0x14000 0x200 bored systq 25280 428584 0 0 3 0x14000 0x200 tmoslp softclockmp 13364 1537 0 0 3 0x14000 0x40000200 tmoslp softclock 91225 454644 0 0 3 0x14000 0x40000200 idle0 1 177352 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &pr->ps_mtx r = 0 (0xffffffff855597d8) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x683 sys/kern/kern_lock.c:487 #2 knote_processfork+0x666 sys/kern/kern_event.c:-1 #3 fork1+0x1225 sys/kern/kern_fork.c:511 #4 kthread_create+0xa8 sys/kern/kern_kthread.c:61 #5 sys_acct+0x35e acct_start sys/kern/kern_acct.c:300 [inline] #5 sys_acct+0x35e sys/kern/kern_acct.c:151 #6 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 #7 Xsyscall+0x128 Process 22954 (syz-executor) thread 0xffff800035301cb0 (5802) exclusive rwlock acctlk r = 0 (0xffffffff853168f8) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x53e sys/kern/kern_rwlock.c:320 #2 sys_acct+0x1be sys/kern/kern_acct.c:137 #3 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 #4 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 1 (0xffffffff85e4c080) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 syscall+0x1048 mi_syscall sys/sys/syscall_mi.h:175 [inline] #1 syscall+0x1048 sys/arch/amd64/amd64/trap.c:783 #2 Xsyscall+0x128 exclusive mutex &pr->ps_mtx r = 0 (0xffffffff855597d8) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x683 sys/kern/kern_lock.c:487 #2 knote_processfork+0x666 sys/kern/kern_event.c:-1 #3 fork1+0x1225 sys/kern/kern_fork.c:511 #4 kthread_create+0xa8 sys/kern/kern_kthread.c:61 #5 sys_acct+0x35e acct_start sys/kern/kern_acct.c:300 [inline] #5 sys_acct+0x35e sys/kern/kern_acct.c:151 #6 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 #7 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11056 12252K 12440K 166960K 12582 0 pcb 18 26K 27K 166960K 65 0 rtable 179 9K 12K 166960K 341 0 pf 32 21K 25K 166960K 69 0 ifaddr 34 9K 12K 166960K 51 0 ifgroup 51 2K 2K 166960K 78 0 sysctl 3 1K 13K 166960K 8 0 counters 68 42K 43K 166960K 82 0 ioctlops 0 0K 4K 166960K 1536 0 iov 0 0K 16K 166960K 16 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1373 88K 89K 166960K 1783 0 UFS quota 1 36K 36K 166960K 1 0 UFS mount 5 44K 44K 166960K 5 0 shm 2 2K 6K 166960K 10 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 18 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 292K 166960K 11964 0 file desc 17 61K 89K 166960K 498 0 proc 70 128K 176K 166960K 606 0 subproc 63 7K 10K 166960K 207 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 20K 20K 166960K 1 0 ip_moptions 0 0K 0K 166960K 23 0 in_multi 67 5K 6K 166960K 91 0 ether_multi 1 0K 0K 166960K 2 0 mrt 1 0K 0K 166960K 15 0 ISOFS mount 1 36K 36K 166960K 1 0 MSDOSFS mount 1 20K 20K 166960K 1 0 ttys 73 506K 506K 166960K 73 0 exec 0 0K 2K 166960K 421 0 fusefs mount 1 36K 36K 166960K 1 0 tdb 3 1K 1K 166960K 3 0 VM swap 14 124K 124K 166960K 15 0 UVM amap 219 237K 264K 166960K 6125 0 UVM aobj 18 4K 4K 166960K 18 0 pinsyscall 1067 1878K 1882K 166960K 1695 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 7 0 NDP 11 0K 1K 166960K 32 0 temp 33 9162K 9182K 166960K 5117 0 kqueue 14 41K 52K 166960K 74 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 37 0 33 1 0 1 1 0 8 0 rtentry 176 105 0 24 5 0 5 5 0 8 0 unpcb 144 231 0 214 1 0 1 1 0 8 0 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 736 95 0 90 7 6 1 7 0 8 0 arp 136 18 0 4 1 0 1 1 0 8 0 inpcb 328 325 0 315 8 6 2 7 0 8 1 nd6 152 22 0 7 1 0 1 1 0 8 0 kcovpl 48 23 0 16 1 0 1 1 0 8 0 ppxss 1192 2 0 2 1 1 0 1 0 8 0 pffrag 232 7 0 0 1 0 1 1 0 482 0 pffrnode 88 7 0 0 1 0 1 1 0 8 0 pffrent 40 10 0 3 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 pfstitem 24 14 0 7 1 0 1 1 0 8 0 pfstkey 128 14 0 7 1 0 1 1 0 8 0 pfstate 448 14 0 7 2 0 2 2 0 8 1 pfrule 1360 24 0 18 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 413 0 90 26 2 24 26 0 8 1 art_table 40 414 0 90 5 0 5 5 0 8 0 art_node 32 105 0 31 1 0 1 1 0 8 0 sysvmsgpl 40 9 0 8 1 0 1 1 0 8 0 semupl 112 2 0 2 1 0 1 1 0 8 1 semapl 72 16 0 6 1 0 1 1 0 8 0 shmpl 112 15 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2123 0 642 94 1 93 93 0 8 0 ffsino 296 2123 0 642 115 0 115 115 0 8 0 nchpl 144 2766 0 1048 64 0 64 64 0 8 0 vnodes 216 2542 0 0 142 0 142 142 0 8 0 namei 1024 8856 0 8856 2 1 1 1 0 8 1 percpumem 16 57 0 7 1 0 1 1 0 8 0 kstatmem 264 39 0 14 2 0 2 2 0 8 0 scxspl 216 9764 0 9764 10 9 1 8 1 8 1 plimitpl 152 63 0 47 1 0 1 1 0 8 0 sigapl 424 819 0 751 8 0 8 8 0 8 0 knotepl 120 127 0 0 4 0 4 4 0 8 0 kqueuepl 224 195 0 185 5 4 1 5 0 8 0 pipepl 344 247 0 220 6 3 3 6 0 8 0 fdescpl 528 782 0 751 3 0 3 3 0 8 0 filepl 160 3891 0 3688 15 5 10 15 0 8 0 lockfpl 104 248 0 246 2 1 1 2 0 8 0 lockfspl 48 119 0 117 1 0 1 1 0 8 0 sessionpl 144 50 0 41 1 0 1 1 0 8 0 pgrppl 48 77 0 61 1 0 1 1 0 8 0 ucredpl 104 417 0 404 1 0 1 1 0 8 0 zombiepl 144 752 0 751 2 1 1 1 0 8 0 processpl 1232 819 0 751 6 0 6 6 0 8 0 procpl 664 1366 0 1292 7 0 7 7 0 8 0 sockpl 752 603 0 572 10 6 4 10 0 8 0 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k128 9344 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 115 0 0 15 0 15 15 0 8 0 mcl2k 2048 27 0 0 4 0 4 4 0 8 0 mextrefs 64 28 0 0 1 0 1 1 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 215 0 0 14 0 14 14 0 8 0 bufpl 272 2898 0 106 187 0 187 187 0 8 0 anonpl 32 6579 0 0 53 0 53 53 0 222 0 amapchunkpl 152 18482 0 18064 28 9 19 28 0 158 1 amappl16 200 2228 0 2206 6 2 4 6 0 8 0 amappl15 192 8 0 8 3 3 0 1 0 8 0 amappl14 184 441 0 438 1 0 1 1 0 8 0 amappl13 176 131 0 118 1 0 1 1 0 8 0 amappl12 168 1053 0 1023 2 0 2 2 0 8 0 amappl11 160 5 0 5 4 4 0 1 0 8 0 amappl10 152 67 0 53 1 0 1 1 0 8 0 amappl9 144 274 0 274 1 1 0 1 0 8 0 amappl8 136 106 0 103 1 0 1 1 0 8 0 amappl7 128 152 0 138 1 0 1 1 0 8 0 amappl6 120 153 0 149 1 0 1 1 0 8 0 amappl5 112 128 0 116 1 0 1 1 0 8 0 amappl4 104 300 0 278 1 0 1 1 0 8 0 amappl3 96 3327 0 3240 3 0 3 3 0 8 0 amappl2 88 917 0 842 2 0 2 2 0 8 0 amappl1 80 11953 0 11330 15 0 15 15 0 8 0 amappl 88 5317 0 5174 5 1 4 5 0 92 0 uvmvnodes 80 106 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 2 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 17 0 0 1 0 1 1 0 8 0 uaddrrnd 24 782 0 751 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 782 0 751 1 0 1 1 0 8 0 vmmpekpl 168 8901 0 8857 3 0 3 3 0 8 0 vmmpepl 168 58054 0 56212 89 4 85 89 0 357 1 vmsppl 488 781 0 751 5 0 5 5 0 8 0 rwobjpl 80 18652 0 17593 24 0 24 24 0 8 0 pdppl 4096 1572 0 1502 100 26 74 84 0 8 4 pvpl 32 14480 0 0 117 0 117 117 0 265 0 pmappl 256 781 0 751 3 0 3 3 0 8 0 extentpl 40 47 0 29 1 0 1 1 0 8 0 phpool 120 467 0 40 13 0 13 13 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace knote_processfork(ffffffff855596c0,8ade) at knote_processfork+0x287 sys/kern/kern_event.c:2246 fork1(ffffffff85559360,f0,ffffffff83dc4990,0,0,ffff80002fad4120) at fork1+0x1225 sys/kern/kern_fork.c:511 kthread_create(ffffffff83dc4990,0,ffffffff85e3fc20,ffffffff84d16b00) at kthread_create+0xa8 sys/kern/kern_kthread.c:61 sys_acct(ffff800035301cb0,ffff80002fad4500,ffff80002fad4460) at sys_acct+0x35e acct_start sys/kern/kern_acct.c:300 [inline] sys_acct(ffff800035301cb0,ffff80002fad4500,ffff80002fad4460) at sys_acct+0x35e sys/kern/kern_acct.c:151 syscall(ffff80002fad4500) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002fad4500) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x17829bf7ba0, count: -6 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x19: leave x86_ipi_db(ffff800028fe3ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412 x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 end of kernel end trace frame: 0x755df7932600, count: 12 ddb{1}> trace x86_ipi_db(ffff800028fe3ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412 x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 end of kernel end trace frame: 0x755df7932600, count: -3