uvm_fault(0xffffffff82d63498, 0x8, 0, 2) -> e kernel: page fault trap, code=2 Stopped at softclock+0xd7: movq %rcx,0x8(%rax) TID PID UID PRFLAGS PFLAGS CPU COMMAND softclock(0) at softclock+0xd7 sys/kern/kern_timeout.c:751 softintr_dispatch(0) at softintr_dispatch+0xcd sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x27 acpicpu_idle() at acpicpu_idle+0x2f1 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffffffff82cc1ff0) at sched_idle+0x41d sys/kern/kern_sched.c:183 end trace frame: 0x0, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: uvm_fault(0xffffffff82d63498, 0x8, 0, 2) -> e ddb{0}> trace softclock(0) at softclock+0xd7 sys/kern/kern_timeout.c:751 softintr_dispatch(0) at softintr_dispatch+0xcd sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x27 acpicpu_idle() at acpicpu_idle+0x2f1 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffffffff82cc1ff0) at sched_idle+0x41d sys/kern/kern_sched.c:183 end trace frame: 0x0, count: -5 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a102a30 rbx 0xffffffff82d7ce60 timeout_todo rdx 0 rcx 0xffffffff82d7ce60 timeout_todo rax 0 r8 0xc8 r9 0xc8 r10 0x28c7f800c3c55a96 r11 0xfbc5e36683e03f86 r12 0xffffffff r13 0xffffffff82d85580 rdrand_tmo r14 0 r15 0xfffffd805bba6c58 rip 0xffffffff81809b37 softclock+0xd7 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a1029f0 ss 0x10 softclock+0xd7: movq %rcx,0x8(%rax) ddb{0}> show proc PROC (idle0) tid=348572 pid=86702 tcnt=1 stat=onproc flags process=14000 proc=40000200 runpri=0, usrpri=50, slppri=0, nice=20 wchan=0x0, wmesg=, ps_single=0x0 forw=0x1cb22e34d563e419, list=0xffff80002a0fbaa0,0xffff80002a0fb010 process=0xffff8000fffff0d0 user=0xffff80002a0fd000, vmspace=0xffffffff82d63498 estcpu=0, cpticks=86092, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 43270 234470 83019 0 3 0x80 nanoslp syz-executor.2 43270 311585 83019 0 3 0x4000080 fsleep syz-executor.2 43270 85725 83019 0 3 0x4000080 fsleep syz-executor.2 43270 494546 83019 0 3 0x4000080 netio syz-executor.2 28874 83586 18240 0 2 0x480 syz-executor.0 28874 34638 18240 0 3 0x4000080 piperd syz-executor.0 28874 442350 18240 0 3 0x4000080 piperd syz-executor.0 28874 264641 18240 0 3 0x4000080 fsleep syz-executor.0 61505 103139 0 0 3 0x14280 nfsidl nfsio 31127 210057 0 0 3 0x14280 nfsidl nfsio 82887 502551 0 0 3 0x14280 nfsidl nfsio 58898 73789 0 0 3 0x14280 nfsidl nfsio 66881 403132 0 0 3 0x14280 nfsidl nfsio 51667 388652 0 0 3 0x14280 nfsidl nfsio 66413 132489 0 0 3 0x14280 nfsidl nfsio 33006 61728 0 0 3 0x14280 nfsidl nfsio 94281 261995 0 0 3 0x14280 nfsidl nfsio 28610 493557 0 0 3 0x14280 nfsidl nfsio 65284 161076 0 0 3 0x14280 nfsidl nfsio 94419 374232 0 0 3 0x14280 nfsidl nfsio 18428 164274 0 0 3 0x14280 nfsidl nfsio 28783 43098 0 0 3 0x14280 nfsidl nfsio 82155 234512 0 0 3 0x14280 nfsidl nfsio 3114 238776 0 0 3 0x14280 nfsidl nfsio 25573 237153 0 0 3 0x14280 nfsidl nfsio 85093 128930 0 0 3 0x14280 nfsidl nfsio 8648 170382 0 0 3 0x14280 nfsidl nfsio 79628 386309 0 0 3 0x14280 nfsidl nfsio 65671 67918 67554 0 3 0x82 piperd syz-executor.1 15200 233800 67554 0 3 0x82 piperd syz-executor.5 83019 419158 67554 0 2 0x482 syz-executor.2 63949 502723 1 0 3 0x18100083 ttyin getty 79851 154880 67554 0 3 0x82 piperd syz-executor.3 6017 353034 67554 0 3 0x82 piperd syz-executor.7 18240 48889 67554 0 2 0x482 syz-executor.0 13684 466156 0 0 3 0x14200 acct acct 47386 516282 67554 0 3 0x82 piperd syz-executor.4 72684 412705 67554 0 3 0x82 piperd syz-executor.6 6949 152732 0 0 3 0x14200 bored sosplice 67554 351762 53420 0 3 0x1a000082 wait syz-fuzzer 67554 51765 53420 0 3 0x1e000082 thrsleep syz-fuzzer 67554 38983 53420 0 3 0x1e000082 thrsleep syz-fuzzer 67554 295840 53420 0 3 0x1e000082 wait syz-fuzzer 67554 185198 53420 0 3 0x1e000082 thrsleep syz-fuzzer 67554 37868 53420 0 3 0x1e000082 wait syz-fuzzer 67554 330699 53420 0 3 0x1e000082 wait syz-fuzzer 67554 446896 53420 0 3 0x1e000082 thrsleep syz-fuzzer 67554 332718 53420 0 3 0x1e000082 kqread syz-fuzzer 67554 396222 53420 0 3 0x1e000082 thrsleep syz-fuzzer 67554 40590 53420 0 3 0x1e000082 thrsleep syz-fuzzer 67554 317188 53420 0 3 0x1e000082 wait syz-fuzzer 67554 500760 53420 0 3 0x1e000082 wait syz-fuzzer 67554 263477 53420 0 3 0x1e000082 wait syz-fuzzer 67554 57959 53420 0 3 0x1e000082 thrsleep syz-fuzzer 67554 90080 53420 0 3 0x1e000082 wait syz-fuzzer 53420 179252 78194 0 3 0x810008a sigsusp ksh 78194 317392 80216 0 3 0x1800009a kqread sshd 80216 105844 1 0 3 0x18000088 kqread sshd 80874 116532 5808 74 3 0x19100092 bpf pflogd 5808 360539 1 0 3 0x18000080 netio pflogd 95611 365208 85372 73 3 0x19100090 kqread syslogd 85372 194099 1 0 3 0x18100082 netio syslogd 68622 178612 1 0 3 0x18100080 kqread resolvd 14425 140810 59553 77 3 0x18100092 kqread dhcpleased 96123 159643 59553 77 3 0x18100092 kqread dhcpleased 59553 413875 1 0 3 0x18000080 kqread dhcpleased 58958 209739 0 0 3 0x14200 bored smr 35152 305172 0 0 3 0x14200 pgzero zerothread 62737 467952 0 0 3 0x14200 aiodoned aiodoned 63627 64463 0 0 3 0x14200 syncer update 88438 289540 0 0 3 0x14200 cleaner cleaner 93640 466322 0 0 3 0x14200 reaper reaper 98522 328819 0 0 3 0x14200 pgdaemon pagedaemon 50013 334656 0 0 3 0x14200 bored viomb 82269 518662 0 0 3 0x40014200 acpi0 acpi0 86885 62361 0 0 7 0x40014200 idle1 7334 193883 0 0 3 0x14200 bored softnet3 3990 164883 0 0 3 0x14200 bored softnet2 18381 382953 0 0 3 0x14200 bored softnet1 91475 491995 0 0 3 0x14200 bored softnet0 19497 319762 0 0 3 0x14200 bored systqmp 71198 168063 0 0 3 0x14200 bored systq 19779 38060 0 0 3 0x14200 tmoslp softclockmp 69390 300613 0 0 3 0x40014200 tmoslp softclock *86702 348572 0 0 7 0x40014200 idle0 1 340959 0 0 3 0x8080082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex /syzkaller/managers/multicore/kernel/sys/kern/kern_timeout.c:57 r = 0 (0xffffffff82cbd260) #0 witness_lock+0x446 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x446 sys/kern/subr_witness.c:1187 #1 mtx_enter_try+0x103 #2 mtx_enter+0x4e sys/kern/kern_lock.c:266 #3 softclock_process_tick_timeout+0x19d sys/kern/kern_timeout.c:723 #4 softclock+0x139 sys/kern/kern_timeout.c:755 #5 softintr_dispatch+0xcd sys/arch/amd64/amd64/softintr.c:90 #6 Xsoftclock+0x27 #7 acpicpu_idle+0x2f1 sys/dev/acpi/acpicpu.c:1206 #8 sched_idle+0x41d sys/kern/kern_sched.c:183 #9 proc_trampoline+0x10 Process 86702 (idle0) thread 0xffff80002a0fb550 (348572) ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10229 6506K 8658K 166960K 23297 0 pcb 15 30K 34K 166960K 4490 0 rtable 254 8K 8K 166960K 8650 0 pf 37 10K 11K 166960K 1002 0 ifaddr 87 29K 30K 166960K 912 0 ifgroup 64 2K 2K 166960K 1570 0 sysctl 4 1K 3K 166960K 57 0 counters 68 36K 37K 166960K 936 0 ioctlops 0 0K 4K 166960K 3662 0 iov 1 2K 32K 166960K 4880 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1683 106K 106K 166960K 13244 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 365 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 6321 0 dirhash 12 2K 3K 166960K 393 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 12 41K 77K 166960K 40455 0 sigio 1 0K 0K 166960K 1420 0 proc 70 91K 116K 166960K 5321 0 subproc 104 6K 7K 166960K 1574 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 3429 0 in_multi 99 7K 7K 166960K 1899 0 ether_multi 1 0K 0K 166960K 38 0 mrt 4 0K 0K 166960K 28 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 247 1102K 1102K 166960K 247 0 exec 0 0K 1K 166960K 6075 0 pfkey data 0 0K 0K 166960K 80 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 728 1313K 1317K 166960K 383347 0 UVM aobj 131 8K 8K 166960K 139 0 pinsyscall 26 52K 108K 166960K 5085 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 1908 0 NDP 14 0K 1K 166960K 695 0 temp 75 6812K 6944K 166960K 263049 0 kqueue 12 18K 30K 166960K 3467 0 SYN cache 2 1504K 1512K 166960K 4 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 24 0 0 1 0 1 1 0 8 0 rtpcb 120 2685 0 2682 37 34 3 5 0 8 2 rtentry 112 2830 0 2714 6 2 4 4 0 8 0 unpcb 144 36932 0 36914 352 346 6 10 0 8 5 syncache 336 366 0 366 75 74 1 1 0 8 1 sackhl 24 3 62 3 1 1 0 1 0 8 0 tcpqe 32 1396 0 1396 58 57 1 1 0 8 1 tcpcb 808 11948 0 11933 363 354 9 23 0 8 6 arp 120 613 0 591 1 0 1 1 0 8 0 inpcb 392 32924 0 32897 590 579 11 24 0 8 7 nd6 136 392 0 365 1 0 1 1 0 8 0 pkpcb 40 172 0 171 33 32 1 1 0 8 0 kcovpl 48 120 0 112 1 0 1 1 0 8 0 ppxss 1168 161 0 161 39 38 1 1 0 8 1 pffrag 232 468 0 467 6 5 1 1 0 482 0 pffrnode 88 464 0 463 6 5 1 1 0 8 0 pffrent 40 1193 0 1192 6 5 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 1269 0 1246 1 0 1 1 0 8 0 pfstkey 128 1279 0 1256 5 3 2 2 0 8 0 pfstate 376 1279 0 1256 24 20 4 9 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 rttmr 136 2 0 2 1 1 0 1 0 8 0 art_heap8 4096 8 0 7 5 4 1 3 0 8 0 art_heap4 256 7853 0 7352 106 74 32 32 0 8 0 art_table 32 7861 0 7359 6 1 5 5 0 8 0 art_node 16 2665 0 2560 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 3 1 0 1 1 0 8 0 semupl 112 4 0 4 1 1 0 1 0 8 0 semapl 112 6319 0 6309 1 0 1 1 0 8 0 shmpl 112 136 0 8 4 0 4 4 0 8 0 dirhash 1024 271 0 254 3 0 3 3 0 8 0 dino2pl 256 54452 0 52770 106 0 106 106 0 8 0 ffsino 272 54452 0 52770 113 0 113 113 0 8 0 nchpl 144 108765 0 107040 67 0 67 67 0 8 0 uvmvnodes 80 6912 0 0 142 0 142 142 0 8 0 vnodes 216 6912 0 0 384 0 384 384 0 8 0 namei 1024 372159 0 372159 17 16 1 2 0 8 1 percpumem 16 482 0 434 1 0 1 1 0 8 0 vcpupl 2048 369 0 2 46 0 46 46 0 8 0 vmpool 696 586 0 219 36 2 34 34 0 8 0 kstatmem 264 896 0 868 9 6 3 3 0 8 0 scxspl 216 321475 0 321475 85 84 1 8 1 8 1 plimitpl 152 5286 0 5270 1 0 1 1 0 8 0 sigapl 424 40639 0 40574 34 26 8 9 0 8 0 futexpl 64 348325 0 348322 1 0 1 1 0 8 0 knotepl 120 2012 0 0 20 2 18 19 0 8 0 kqueuepl 216 9982 0 9974 208 207 1 8 0 8 0 pipepl 320 6166 0 6137 166 163 3 14 0 8 0 fdescpl 496 40536 0 40511 28 24 4 5 0 8 0 filepl 152 253458 0 253213 399 384 15 22 0 8 3 lockfpl 104 11662 0 11660 20 19 1 2 0 8 0 lockfspl 48 3234 0 3232 1 0 1 1 0 8 0 sessionpl 144 139 0 122 1 0 1 1 0 8 0 pgrppl 48 636 0 619 1 0 1 1 0 8 0 ucredpl 104 33584 0 33572 1 0 1 1 0 8 0 zombiepl 144 40574 0 40574 2 1 1 1 0 8 1 processpl 1136 40639 0 40574 7 1 6 6 0 8 0 procpl 680 105712 0 105626 17 8 9 10 0 8 0 srpgc 96 187 0 187 55 55 0 1 0 8 0 sosppl 168 596 0 596 21 20 1 1 0 8 1 sockpl 584 72804 0 72763 713 700 13 24 0 8 8 mcl64k 65536 20 0 0 3 0 3 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 15 0 0 2 0 2 2 0 8 0 mcl8k 8192 27 0 0 4 1 3 3 0 8 0 mcl4k 4096 26 0 0 3 0 3 3 0 8 0 mcl2k2 2112 18 0 0 2 0 2 2 0 8 0 mcl2k 2048 595 0 0 29 15 14 29 0 8 0 mtagpl 96 270 0 0 6 0 6 6 0 8 0 mbufpl 256 5890 0 0 293 0 293 293 0 8 0 bufpl 280 73030 0 66117 495 0 495 495 0 8 0 anonpl 24 3926045 0 3908999 320 198 122 164 0 186 0 amapchunkpl 152 1222529 0 1221601 191 148 43 72 0 158 0 amappl16 200 80840 0 80152 349 309 40 63 0 8 0 amappl15 192 188 0 186 2 1 1 1 0 8 0 amappl14 184 535 0 512 7 5 2 2 0 8 0 amappl13 176 25 0 24 1 0 1 1 0 8 0 amappl12 168 42946 0 42911 3 1 2 2 0 8 0 amappl11 160 137 0 122 1 0 1 1 0 8 0 amappl10 152 298 0 274 3 1 2 2 0 8 0 amappl9 144 500 0 500 73 73 0 1 0 8 0 amappl8 136 1799 0 1589 8 0 8 8 0 8 0 amappl7 128 240 0 224 1 0 1 1 0 8 0 amappl6 120 2134 0 2092 5 3 2 2 0 8 0 amappl5 112 1352 0 1336 1 0 1 1 0 8 0 amappl4 104 2292 0 2240 3 1 2 3 0 8 0 amappl3 96 236358 0 236288 3 0 3 3 0 8 0 amappl2 88 42778 0 42694 5 2 3 4 0 8 0 amappl1 80 158793 0 158266 22 9 13 22 0 8 0 amappl 88 380838 0 380507 12 3 9 10 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 72 138 0 8 3 0 3 3 0 8 0 uaddrrnd 24 41122 0 40730 4 1 3 3 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 41122 0 40730 4 1 3 3 0 8 0 vmmpekpl 168 251074 0 250959 8 2 6 6 0 8 0 vmmpepl 168 2404479 0 2401538 862 691 171 178 0 357 0 vmsppl 448 41121 0 40730 51 6 45 45 0 8 0 rwobjpl 56 555764 0 546663 157 27 130 133 0 8 0 pdppl 4096 82251 0 81827 2224 1788 436 436 0 8 12 pvpl 32 48790 0 0 394 0 394 394 0 265 0 pmappl 248 41121 0 40730 26 1 25 25 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 4216 0 3080 33 0 33 33 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace softclock(0) at softclock+0xd7 sys/kern/kern_timeout.c:751 softintr_dispatch(0) at softintr_dispatch+0xcd sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x27 acpicpu_idle() at acpicpu_idle+0x2f1 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffffffff82cc1ff0) at sched_idle+0x41d sys/kern/kern_sched.c:183 end trace frame: 0x0, count: -5 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffff800029cebff0) 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 acpicpu_idle() at acpicpu_idle+0x2f1 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800029cebff0) at sched_idle+0x41d sys/kern/kern_sched.c:183 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff800029cebff0) 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 acpicpu_idle() at acpicpu_idle+0x2f1 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800029cebff0) at sched_idle+0x41d sys/kern/kern_sched.c:183 end trace frame: 0x0, count: -5