uvm_fault(0xffffffff82c7b888, 0xffffffe8dfffab10, 0, 1) -> e kernel: page fault trap, code=0 Stopped at softclock_process_kclock_timeout+0x3e: movq timeout_kclock(%r15),%r13 TID PID UID PRFLAGS PFLAGS CPU COMMAND *192642 54173 0 0 0 0K syz-executor.0 83449 96724 0 0x2000002 0x4000000 1 syz-fuzzer softclock_process_kclock_timeout(fffffd807b986f00,0) at softclock_process_kclock_timeout+0x3e sys/kern/kern_timeout.c:676 softclock(0) at softclock+0x11a sys/kern/kern_timeout.c:754 softintr_dispatch(0) at softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x7aff7d48f590, count: 11 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(0xffffffff82c7b888, 0xffffffe8dfffab10, 0, 1) -> e ddb{0}> trace softclock_process_kclock_timeout(fffffd807b986f00,0) at softclock_process_kclock_timeout+0x3e sys/kern/kern_timeout.c:676 softclock(0) at softclock+0x11a sys/kern/kern_timeout.c:754 softintr_dispatch(0) at softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x7aff7d48f590, count: -4 ddb{0}> show registers rdi 0xfffffd807b986f00 rsi 0 rbp 0xffff80002bb63250 rbx 0 rdx 0 rcx 0xffff80002a2b8540 rax 0xffffffff87462000 end+0x4662000 r8 0xdc r9 0xdc r10 0x61746f14f85fdc75 r11 0x482b616b48627735 r12 0 r13 0xffffffff82c70690 rdrand_tmo r14 0xfffffd807b986f00 r15 0xffffffe95d260000 rip 0xffffffff8272382e softclock_process_kclock_timeout+0x3e cs 0x8 rflags 0x10287 __ALIGN_SIZE+0xf287 rsp 0xffff80002bb63200 ss 0 softclock_process_kclock_timeout+0x3e: movq timeout_kclock(%r15),%r13 ddb{0}> show proc PROC (syz-executor.0) tid=192642 pid=54173 tcnt=2 stat=onproc flags process=0 proc=0 runpri=81, usrpri=81, slppri=16, nice=20 wchan=0x0, wmesg=, ps_single=0x0 forw=0xffffffffffffffff, list=0xffff80002a249000,0xffff80002a2b8000 process=0xffff80002bb250e0 user=0xffff80002bb5e000, vmspace=0xfffffd8069bcb758 estcpu=31, cpticks=1, pctcpu=0.0, user=1, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 35674 316116 11428 0 2 0 syz-executor.4 *54173 192642 49056 0 7 0 syz-executor.0 54173 194924 49056 0 2 0x4000000 syz-executor.0 78633 318819 92353 0 2 0 syz-executor.6 78633 261411 92353 0 3 0x4000080 netcon2 syz-executor.6 31023 38198 0 0 3 0x14280 nfsidl nfsio 84084 218481 0 0 3 0x14280 nfsidl nfsio 70491 413231 0 0 3 0x14280 nfsidl nfsio 79784 182453 0 0 3 0x14280 nfsidl nfsio 87476 307817 0 0 3 0x14280 nfsidl nfsio 34757 523919 0 0 3 0x14280 nfsidl nfsio 41291 412348 0 0 3 0x14280 nfsidl nfsio 75978 160360 0 0 3 0x14280 nfsidl nfsio 10916 315204 0 0 3 0x14280 nfsidl nfsio 17613 337752 0 0 3 0x14280 nfsidl nfsio 39843 376988 0 0 3 0x14280 nfsidl nfsio 13982 105244 0 0 3 0x14280 nfsidl nfsio 29266 110427 0 0 3 0x14280 nfsidl nfsio 46894 59816 0 0 3 0x14280 nfsidl nfsio 18864 446963 0 0 3 0x14280 nfsidl nfsio 29342 269440 0 0 3 0x14280 nfsidl nfsio 20560 376733 0 0 3 0x14280 nfsidl nfsio 5117 471441 0 0 3 0x14280 nfsidl nfsio 47320 506755 0 0 3 0x14280 nfsidl nfsio 71814 293928 0 0 3 0x14280 nfsidl nfsio 73192 115474 96724 0 3 0x82 piperd syz-executor.5 49056 395910 96724 0 2 0x482 syz-executor.0 29376 142404 96724 0 3 0x82 piperd syz-executor.7 54908 250001 1 0 3 0x100083 ttyin getty 99713 12328 96724 0 2 0x482 syz-executor.2 64135 4056 0 0 3 0x14200 bored sosplice 92353 117942 96724 0 3 0x82 nanoslp syz-executor.6 50644 211654 96724 0 2 0x482 syz-executor.3 55030 417933 96724 0 3 0x82 piperd syz-executor.1 11428 114092 96724 0 3 0x82 nanoslp syz-executor.4 96724 287166 12780 0 3 0x2000082 wait syz-fuzzer 96724 83449 12780 0 7 0x6000002 syz-fuzzer 96724 438590 12780 0 3 0x6000082 kqread syz-fuzzer 96724 102739 12780 0 3 0x6000082 wait syz-fuzzer 96724 103044 12780 0 3 0x6000082 wait syz-fuzzer 96724 473398 12780 0 3 0x6000082 thrsleep syz-fuzzer 96724 225253 12780 0 3 0x6000082 thrsleep syz-fuzzer 96724 504159 12780 0 3 0x6000082 wait syz-fuzzer 96724 87540 12780 0 3 0x6000082 wait syz-fuzzer 96724 159677 12780 0 3 0x6000082 thrsleep syz-fuzzer 96724 302781 12780 0 3 0x6000082 thrsleep syz-fuzzer 96724 312684 12780 0 3 0x6000082 wait syz-fuzzer 96724 3167 12780 0 3 0x6000082 wait syz-fuzzer 96724 151120 12780 0 3 0x6000082 wait syz-fuzzer 96724 474967 12780 0 3 0x6000082 thrsleep syz-fuzzer 96724 151255 12780 0 3 0x6000082 thrsleep syz-fuzzer 12780 148209 50637 0 3 0x10008a sigsusp ksh 50637 235752 56757 0 3 0x9a kqread sshd 56757 213173 1 0 3 0x88 kqread sshd 64323 293491 45666 74 3 0x1100092 bpf pflogd 45666 403720 1 0 3 0x80 netio pflogd 2860 405900 38308 73 3 0x1100090 kqread syslogd 38308 101136 1 0 3 0x100082 netio syslogd 17648 469197 1 0 3 0x100080 kqread resolvd 92415 469916 95570 77 3 0x100092 kqread dhcpleased 97355 247219 95570 77 3 0x100092 kqread dhcpleased 95570 188039 1 0 3 0x80 kqread dhcpleased 37229 13972 0 0 3 0x14200 bored smr 97159 164282 0 0 3 0x14200 pgzero zerothread 8891 190144 0 0 3 0x14200 aiodoned aiodoned 66223 409764 0 0 3 0x14200 syncer update 70773 439884 0 0 3 0x14200 cleaner cleaner 84830 200900 0 0 3 0x14200 reaper reaper 26886 475808 0 0 3 0x14200 pgdaemon pagedaemon 84211 283079 0 0 3 0x14200 bored viomb 47305 331122 0 0 3 0x40014200 acpi0 acpi0 87152 138951 0 0 3 0x40014200 idle1 38402 170787 0 0 3 0x14200 bored softnet3 30346 397364 0 0 3 0x14200 bored softnet2 14620 233761 0 0 3 0x14200 bored softnet1 82462 227453 0 0 3 0x14200 bored softnet0 40630 262028 0 0 3 0x14200 bored systqmp 36049 306407 0 0 3 0x14200 bored systq 37708 290716 0 0 3 0x14200 tmoslp softclockmp 26684 91623 0 0 3 0x40014200 tmoslp softclock 48408 93116 0 0 3 0x40014200 idle0 1 237559 0 0 3 0x82 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 (0xffffffff82c5a7f0) #0 witness_lock+0x447 #1 mtx_enter_try+0x104 #2 mtx_enter+0x4f sys/kern/kern_lock.c:266 #3 softclock_process_tick_timeout+0x1b2 sys/kern/kern_timeout.c:722 #4 softclock+0x130 sys/kern/kern_timeout.c:748 #5 softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90 #6 Xsoftclock+0x27 Process 54173 (syz-executor.0) thread 0xffff80002a2b8540 (192642) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82d7fd78) #0 witness_lock+0x447 #1 softintr_dispatch+0x52 sys/arch/amd64/amd64/softintr.c:88 #2 Xsoftclock+0x27 exclusive mutex /syzkaller/managers/multicore/kernel/sys/kern/kern_timeout.c:57 r = 0 (0xffffffff82c5a7f0) #0 witness_lock+0x447 #1 mtx_enter_try+0x104 #2 mtx_enter+0x4f sys/kern/kern_lock.c:266 #3 softclock_process_tick_timeout+0x1b2 sys/kern/kern_timeout.c:722 #4 softclock+0x130 sys/kern/kern_timeout.c:748 #5 softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90 #6 Xsoftclock+0x27 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10229 6506K 14695K 166960K 22225 0 pcb 13 18K 22K 166960K 505 0 rtable 243 7K 7K 166960K 937 0 pf 37 10K 10K 166960K 118 0 ifaddr 46 15K 16K 166960K 93 0 ifgroup 64 2K 2K 166960K 180 0 sysctl 2 0K 0K 166960K 2 0 counters 66 36K 36K 166960K 122 0 ioctlops 0 0K 4K 166960K 1646 0 iov 0 0K 16K 166960K 703 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1410 88K 88K 166960K 9369 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 13K 166960K 88 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 104 0 dirhash 12 2K 2K 166960K 30 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 13 45K 97K 166960K 14840 0 sigio 0 0K 0K 166960K 1559 0 proc 70 91K 163K 166960K 1123 0 subproc 104 6K 6K 166960K 156 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 2580 0 in_multi 98 7K 7K 166960K 269 0 ether_multi 1 0K 0K 166960K 27 0 mrt 0 0K 0K 166960K 15 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 169 758K 758K 166960K 169 0 exec 0 0K 1K 166960K 1871 0 pfkey data 0 0K 0K 166960K 8 0 tdb 3 0K 0K 166960K 3 0 pagedep 1 8K 8K 166960K 1 0 inodedep 1 32K 32K 166960K 1 0 newblk 1 0K 0K 166960K 1 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 387 117K 119K 166960K 141715 0 UVM aobj 131 5K 5K 166960K 148 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 283 0 NDP 14 0K 2K 166960K 66 0 temp 74 5924K 6056K 166960K 69819 0 kqueue 12 18K 26K 166960K 302 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 22 0 0 1 0 1 1 0 8 0 rtpcb 120 252 0 249 5 4 1 3 0 8 0 rtentry 112 355 0 242 4 0 4 4 0 8 0 unpcb 144 5666 0 5649 68 67 1 6 0 8 0 syncache 312 118 0 118 18 18 0 1 0 8 0 sackhl 24 3 0 3 1 1 0 1 0 8 0 tcpqe 32 191 0 191 12 12 0 1 0 8 0 tcpcb 808 20546 0 20533 202 194 8 21 0 8 6 arp 120 28 0 12 1 0 1 1 0 8 0 inpcb 368 22558 0 22539 188 180 8 20 0 8 5 nd6 136 220 0 189 2 0 2 2 0 8 0 pkpcb 40 31 0 31 6 6 0 1 0 8 0 kcovpl 48 12 0 4 1 0 1 1 0 8 0 ppxss 1256 5 0 5 1 1 0 1 0 8 0 pffrag 232 58 0 57 7 6 1 1 0 482 0 pffrnode 88 56 0 55 7 6 1 1 0 8 0 pffrent 40 169 0 168 7 6 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 1401 0 1154 4 1 3 4 0 8 0 pfstkey 128 1401 0 1154 22 8 14 20 0 8 1 pfstate 376 1401 0 1154 71 36 35 61 0 8 4 pfrule 1344 21 0 16 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1901 0 1423 36 6 30 31 0 8 0 art_table 32 1902 0 1423 4 0 4 4 0 8 0 art_node 16 343 0 240 1 0 1 1 0 8 0 sysvmsgpl 40 49 0 32 1 0 1 1 0 8 0 semapl 112 90 0 80 1 0 1 1 0 8 0 shmpl 112 145 0 17 4 0 4 4 0 8 0 dirhash 1024 29 0 12 3 0 3 3 0 8 0 dino2pl 256 22441 0 20977 93 1 92 92 0 8 0 ffsino 272 22441 0 20977 100 2 98 98 0 8 0 nchpl 144 42799 0 41148 65 1 64 65 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 129281 0 129281 5 4 1 2 0 8 1 percpumem 16 74 0 28 1 0 1 1 0 8 0 vcpupl 2048 7 0 0 1 0 1 1 0 8 0 vmpool 696 10 0 3 1 0 1 1 0 8 0 kstatmem 264 84 0 56 2 0 2 2 0 8 0 scxspl 216 106005 0 106005 15 14 1 8 1 8 1 plimitpl 152 255 0 239 1 0 1 1 0 8 0 sigapl 424 15178 0 15111 10 2 8 8 0 8 0 futexpl 64 120767 0 120767 2 1 1 1 0 8 1 knotepl 120 185 0 0 5 0 5 5 0 8 0 kqueuepl 216 855 0 847 17 16 1 7 0 8 0 pipepl 320 6289 0 6261 92 89 3 14 0 8 0 fdescpl 496 15139 0 15113 6 2 4 5 0 8 0 filepl 152 91813 0 91570 138 126 12 24 0 8 2 lockfpl 104 1615 0 1613 2 1 1 2 0 8 0 lockfspl 48 717 0 715 1 0 1 1 0 8 0 sessionpl 144 30 0 13 1 0 1 1 0 8 0 pgrppl 48 53 0 36 1 0 1 1 0 8 0 ucredpl 104 29988 0 29976 1 0 1 1 0 8 0 zombiepl 144 15113 0 15111 1 0 1 1 0 8 0 processpl 1072 15178 0 15111 5 0 5 5 0 8 0 procpl 680 38709 0 38625 21 12 9 10 0 8 1 sosppl 168 134 0 134 9 9 0 1 0 8 0 sockpl 488 28513 0 28475 355 342 13 38 0 8 6 mcl64k 65536 15 0 0 2 0 2 2 0 8 0 mcl16k 16384 25 0 0 3 0 3 3 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 25 0 0 4 1 3 3 0 8 0 mcl4k 4096 27 0 0 3 1 2 3 0 8 0 mcl2k2 2112 11 0 0 1 0 1 1 0 8 0 mcl2k 2048 684 0 0 32 13 19 32 0 8 0 mtagpl 96 542 0 0 12 0 12 12 0 8 0 mbufpl 256 2798 0 0 169 0 169 169 0 8 0 bufpl 288 21507 0 15185 452 0 452 452 0 8 0 anonpl 24 1252910 0 1243295 155 93 62 75 0 186 0 amapchunkpl 152 445743 0 445080 85 52 33 42 0 158 2 amappl16 200 22081 0 21817 78 63 15 24 0 8 0 amappl15 192 13 0 12 1 0 1 1 0 8 0 amappl14 184 175 0 160 2 1 1 2 0 8 0 amappl13 176 9 0 9 2 2 0 1 0 8 0 amappl12 168 15885 0 15855 4 2 2 3 0 8 0 amappl11 160 69 0 53 1 0 1 1 0 8 0 amappl10 152 52 0 38 1 0 1 1 0 8 0 amappl9 144 201 0 201 7 6 1 1 0 8 1 amappl8 136 649 0 487 6 0 6 6 0 8 0 amappl7 128 232 0 204 2 0 2 2 0 8 0 amappl6 120 383 0 373 1 0 1 1 0 8 0 amappl5 112 279 0 266 1 0 1 1 0 8 0 amappl4 104 579 0 552 2 1 1 2 0 8 0 amappl3 96 88299 0 88229 4 1 3 3 0 8 0 amappl2 88 15949 0 15874 3 1 2 3 0 8 0 amappl1 80 60040 0 59502 22 9 13 22 0 8 0 amappl 88 140817 0 140627 7 1 6 6 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 72 147 0 17 3 0 3 3 0 8 0 uaddrrnd 24 15149 0 15116 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 15149 0 15116 1 0 1 1 0 8 0 vmmpekpl 168 123447 0 123385 4 0 4 4 0 8 0 vmmpepl 168 868237 0 866104 177 71 106 117 0 357 1 vmsppl 464 15148 0 15116 6 1 5 5 0 8 0 rwobjpl 56 199759 0 192289 119 12 107 108 0 8 0 pdppl 4096 30306 0 30239 617 540 77 86 0 8 10 pvpl 32 3968279 0 3952960 485 351 134 362 0 265 0 pmappl 248 15148 0 15116 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1954 0 975 29 0 29 29 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace softclock_process_kclock_timeout(fffffd807b986f00,0) at softclock_process_kclock_timeout+0x3e sys/kern/kern_timeout.c:676 softclock(0) at softclock+0x11a sys/kern/kern_timeout.c:754 softintr_dispatch(0) at softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x7aff7d48f590, count: -4 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffff800029d2bff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x29 kd_curproc sys/dev/kcov.c:589 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x29 sys/dev/kcov.c:158 __mp_lock(ffffffff82d7fb70) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82d7fb70) at __mp_lock+0x133 sys/kern/kern_lock.c:147 syscall(ffff80002a22c440) at syscall+0x37d mi_syscall sys/sys/syscall_mi.h:77 [inline] syscall(ffff80002a22c440) at syscall+0x37d sys/arch/amd64/amd64/trap.c:606 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2861e50a0, count: 8 ddb{1}> trace x86_ipi_db(ffff800029d2bff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x29 kd_curproc sys/dev/kcov.c:589 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x29 sys/dev/kcov.c:158 __mp_lock(ffffffff82d7fb70) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82d7fb70) at __mp_lock+0x133 sys/kern/kern_lock.c:147 syscall(ffff80002a22c440) at syscall+0x37d mi_syscall sys/sys/syscall_mi.h:77 [inline] syscall(ffff80002a22c440) at syscall+0x37d sys/arch/amd64/amd64/trap.c:606 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2861e50a0, count: -7