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 163616 62792 0 0x14000 0x200 1 update 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 0xffff80002a101eb0 rbx 0xffffffff82d7ce60 timeout_todo rdx 0 rcx 0xffffffff82d7ce60 timeout_todo rax 0 r8 0 r9 0 r10 0x8ade7f7e3f57a2de r11 0x81b110ced543748b r12 0xffffffff r13 0xffffffff82d85580 rdrand_tmo r14 0 r15 0xfffffd805d789f00 rip 0xffffffff81809b37 softclock+0xd7 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a101e70 ss 0x10 softclock+0xd7: movq %rcx,0x8(%rax) ddb{0}> show proc PROC (idle0) tid=414711 pid=99104 tcnt=1 stat=onproc flags process=14000 proc=40000200 runpri=0, usrpri=50, slppri=0, nice=20 wchan=0x0, wmesg=, ps_single=0x0 forw=0xa1a5bb94f265b135, list=0xffff80002a0fcd38,0xffff80002a0fc550 process=0xffff8000fffff0d0 user=0xffff80002a0fd000, vmspace=0xffffffff82d63498 estcpu=0, cpticks=50158, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 15447 95291 9483 0 3 0x82 piperd syz-executor.3 37984 318481 0 0 3 0x14200 acct acct 7853 83929 9483 0 3 0x82 piperd syz-executor.0 43044 121916 9483 0 3 0x82 nanoslp syz-executor.1 87884 141176 1 0 3 0x18100083 ttyin getty 24255 510007 9483 0 3 0x82 piperd syz-executor.7 98296 436973 9483 0 3 0x82 piperd syz-executor.6 24311 189866 9483 0 3 0x82 piperd syz-executor.5 25342 112679 0 0 3 0x14280 nfsidl nfsio 22110 13675 0 0 3 0x14280 nfsidl nfsio 86645 17192 0 0 3 0x14280 nfsidl nfsio 37046 8525 0 0 3 0x14280 nfsidl nfsio 99991 146633 0 0 3 0x14280 nfsidl nfsio 27464 373169 0 0 3 0x14280 nfsidl nfsio 85363 198395 0 0 3 0x14280 nfsidl nfsio 6882 372446 0 0 3 0x14280 nfsidl nfsio 59378 477850 0 0 3 0x14280 nfsidl nfsio 38906 518046 0 0 3 0x14280 nfsidl nfsio 59701 216169 0 0 3 0x14280 nfsidl nfsio 36446 415157 0 0 3 0x14280 nfsidl nfsio 96060 39631 0 0 3 0x14280 nfsidl nfsio 7245 266648 0 0 3 0x14280 nfsidl nfsio 78028 183304 0 0 3 0x14280 nfsidl nfsio 10693 348053 0 0 3 0x14280 nfsidl nfsio 69798 403462 0 0 3 0x14280 nfsidl nfsio 76412 92209 0 0 3 0x14280 nfsidl nfsio 54159 50623 0 0 3 0x14280 nfsidl nfsio 95516 373179 0 0 3 0x14280 nfsidl nfsio 99345 391229 9483 0 3 0x82 piperd syz-executor.2 46218 365433 9483 0 3 0x82 piperd syz-executor.4 46006 233825 0 0 3 0x14200 bored sosplice 9483 271439 84151 0 3 0x1a000082 wait syz-fuzzer 9483 412951 84151 0 3 0x1e000082 thrsleep syz-fuzzer 9483 25624 84151 0 3 0x1e000082 wait syz-fuzzer 9483 30871 84151 0 3 0x1e000082 thrsleep syz-fuzzer 9483 326391 84151 0 3 0x1e000082 wait syz-fuzzer 9483 226599 84151 0 3 0x1e000082 wait syz-fuzzer 9483 302588 84151 0 3 0x1e000082 thrsleep syz-fuzzer 9483 397256 84151 0 3 0x1e000082 thrsleep syz-fuzzer 9483 441848 84151 0 3 0x1e000082 thrsleep syz-fuzzer 9483 29717 84151 0 3 0x1e000082 wait syz-fuzzer 9483 283736 84151 0 3 0x1e000082 thrsleep syz-fuzzer 9483 446184 84151 0 3 0x1e000082 kqread syz-fuzzer 9483 130976 84151 0 3 0x1e000082 wait syz-fuzzer 9483 113174 84151 0 3 0x1e000082 wait syz-fuzzer 9483 193449 84151 0 3 0x1e000082 thrsleep syz-fuzzer 9483 322391 84151 0 3 0x1e000082 wait syz-fuzzer 84151 284076 22463 0 3 0x810008a sigsusp ksh 22463 258373 3660 0 3 0x1800009a kqread sshd 3660 389919 1 0 3 0x18000088 kqread sshd 31168 96578 88807 74 3 0x19100092 bpf pflogd 88807 274533 1 0 3 0x18000080 netio pflogd 99272 1022 47959 73 3 0x19100090 kqread syslogd 47959 112871 1 0 3 0x18100082 netio syslogd 47542 75877 1 0 3 0x18100080 kqread resolvd 51338 39068 65019 77 3 0x18100092 kqread dhcpleased 53266 456951 65019 77 3 0x18100092 kqread dhcpleased 65019 34964 1 0 3 0x18000080 kqread dhcpleased 66476 185966 0 0 3 0x14200 bored smr 62796 127389 0 0 3 0x14200 pgzero zerothread 98338 27772 0 0 3 0x14200 aiodoned aiodoned 62792 163616 0 0 7 0x14200 update 48052 99755 0 0 3 0x14200 cleaner cleaner 5810 145706 0 0 3 0x14200 reaper reaper 54235 209756 0 0 3 0x14200 pgdaemon pagedaemon 43638 485781 0 0 3 0x14200 bored viomb 4649 491005 0 0 3 0x40014200 acpi0 acpi0 45921 203462 0 0 3 0x40014200 idle1 6456 439745 0 0 3 0x14200 bored softnet3 32614 223531 0 0 3 0x14200 bored softnet2 30065 338525 0 0 3 0x14200 bored softnet1 53474 420528 0 0 3 0x14200 bored softnet0 10186 4002 0 0 3 0x14200 bored systqmp 3016 190810 0 0 3 0x14200 bored systq 20439 443386 0 0 3 0x14200 tmoslp softclockmp 23764 146609 0 0 3 0x40014200 tmoslp softclock *99104 414711 0 0 7 0x40014200 idle0 1 289584 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 99104 (idle0) thread 0xffff80002a0fc7e8 (414711) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82d60cf8) #0 witness_lock+0x446 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x446 sys/kern/subr_witness.c:1187 #1 softintr_dispatch+0x52 sys/arch/amd64/amd64/softintr.c:88 #2 Xsoftclock+0x27 #3 acpicpu_idle+0x2f1 sys/dev/acpi/acpicpu.c:1206 #4 sched_idle+0x41d sys/kern/kern_sched.c:183 #5 proc_trampoline+0x10 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 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10223 6506K 7595K 166960K 22338 0 pcb 15 22K 27K 166960K 2965 0 rtable 237 9K 10K 166960K 4027 0 pf 32 9K 10K 166960K 604 0 ifaddr 43 19K 21K 166960K 520 0 ifgroup 55 2K 2K 166960K 948 0 sysctl 4 1K 3K 166960K 51 0 counters 64 36K 36K 166960K 564 0 ioctlops 0 0K 4K 166960K 2698 0 iov 0 0K 24K 166960K 3524 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1741 109K 110K 166960K 8390 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 282 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 2685 0 dirhash 78 14K 17K 166960K 14022 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 11 37K 93K 166960K 25211 0 sigio 0 0K 0K 166960K 1051 0 proc 84 92K 140K 166960K 3470 0 subproc 104 6K 10K 166960K 1047 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 1573 0 in_multi 78 5K 7K 166960K 1057 0 ether_multi 1 0K 0K 166960K 17 0 mrt 1 0K 0K 166960K 16 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 3196 0 pfkey data 0 0K 0K 166960K 59 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 579 988K 991K 166960K 248688 0 UVM aobj 131 4K 5K 166960K 148 0 pinsyscall 26 52K 108K 166960K 3551 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 1035 0 NDP 14 0K 2K 166960K 415 0 temp 74 6812K 6944K 166960K 153746 0 kqueue 12 18K 30K 166960K 2203 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 1648 0 1645 23 22 1 5 0 8 0 rtentry 112 1156 0 1049 5 1 4 4 0 8 0 unpcb 144 21713 0 21698 185 183 2 10 0 8 1 syncache 336 185 0 185 38 38 0 1 0 8 0 tcpqe 32 228 22 228 27 27 0 1 0 8 0 tcpcb 808 7034 0 7007 203 199 4 11 0 8 0 arp 120 251 0 226 1 0 1 1 0 8 0 ipq 40 2 0 2 1 1 0 1 0 8 0 ipqe 40 6 0 6 1 1 0 1 0 8 0 inpcb 392 19660 0 19613 283 276 7 20 0 8 2 nd6 136 239 0 219 1 0 1 1 0 8 0 pkpcb 40 69 0 69 17 17 0 1 0 8 0 kcovpl 48 74 0 66 1 0 1 1 0 8 0 ppxss 1168 84 0 84 23 23 0 1 0 8 0 pffrag 232 226 0 217 7 6 1 1 0 482 0 pffrnode 88 226 0 217 7 6 1 1 0 8 0 pffrent 40 579 0 570 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 24 713 0 672 1 0 1 1 0 8 0 pfstkey 128 721 0 680 3 1 2 2 0 8 0 pfstate 376 721 0 680 15 10 5 6 0 8 0 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 9 0 7 3 1 2 3 0 8 0 art_heap4 256 4030 0 3586 61 30 31 31 0 8 2 art_table 32 4039 0 3593 4 0 4 4 0 8 0 art_node 16 1127 0 1033 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 0 1 0 1 1 0 8 0 semapl 112 2683 0 2673 1 0 1 1 0 8 0 shmpl 112 145 0 17 4 0 4 4 0 8 0 dirhash 1024 4708 0 4669 8 2 6 6 0 8 0 dino2pl 256 33841 0 32221 102 0 102 102 0 8 0 ffsino 272 33841 0 32221 110 1 109 109 0 8 0 nchpl 144 68031 0 66303 67 0 67 67 0 8 0 uvmvnodes 80 7326 0 0 150 0 150 150 0 8 0 vnodes 216 7326 0 0 407 0 407 407 0 8 0 namei 1024 224842 0 224842 11 10 1 3 0 8 1 percpumem 16 296 0 250 1 0 1 1 0 8 0 vcpupl 2048 192 0 1 24 0 24 24 0 8 0 vmpool 696 232 0 41 19 1 18 18 0 8 0 kstatmem 264 524 0 500 2 0 2 2 0 8 0 scxspl 216 221177 0 221161 75 74 1 8 1 8 0 plimitpl 152 3027 0 3011 1 0 1 1 0 8 0 sigapl 424 25459 0 25395 15 6 9 9 0 8 0 futexpl 64 191807 0 191807 4 3 1 1 0 8 1 knotepl 120 1004 0 0 11 0 11 11 0 8 0 kqueuepl 216 4495 0 4487 61 60 1 6 0 8 0 pipepl 320 4313 0 4284 124 121 3 13 0 8 0 fdescpl 496 25394 0 25370 20 16 4 5 0 8 0 filepl 152 148522 0 148277 186 174 12 22 0 8 1 lockfpl 104 7105 0 7103 10 9 1 2 0 8 0 lockfspl 48 2073 0 2071 1 0 1 1 0 8 0 sessionpl 144 98 0 81 1 0 1 1 0 8 0 pgrppl 48 323 0 306 1 0 1 1 0 8 0 ucredpl 104 18186 0 18174 1 0 1 1 0 8 0 zombiepl 144 25396 0 25395 2 1 1 1 0 8 0 processpl 1136 25459 0 25395 8 2 6 6 0 8 0 procpl 680 70222 0 70143 13 4 9 10 0 8 0 srpgc 96 114 0 114 34 33 1 1 0 8 1 sosppl 168 325 0 318 14 13 1 1 0 8 0 sockpl 584 43114 0 43063 341 333 8 22 0 8 3 mcl64k 65536 33 0 0 5 2 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 18 0 0 2 0 2 2 0 8 0 mcl8k 8192 43 0 0 4 1 3 3 0 8 0 mcl4k 4096 65 0 0 6 2 4 4 0 8 0 mcl2k2 2112 13 0 0 1 0 1 1 0 8 0 mcl2k 2048 585 0 0 40 24 16 40 0 8 0 mtagpl 96 380 0 0 9 2 7 9 0 8 0 mbufpl 256 5241 0 0 284 0 284 284 0 8 0 bufpl 280 47167 0 39841 524 0 524 524 0 8 0 anonpl 24 2552144 0 2539343 249 129 120 143 0 186 5 amapchunkpl 152 790508 0 789702 139 98 41 50 0 158 1 amappl16 200 48797 0 48263 181 145 36 54 0 8 0 amappl15 192 168 0 166 1 0 1 1 0 8 0 amappl14 184 408 0 384 4 2 2 2 0 8 0 amappl13 176 25 0 25 7 7 0 1 0 8 0 amappl12 168 27098 0 27066 3 1 2 2 0 8 0 amappl11 160 65 0 51 1 0 1 1 0 8 0 amappl10 152 146 0 129 1 0 1 1 0 8 0 amappl9 144 477 0 477 32 31 1 1 0 8 1 amappl8 136 1232 0 1049 7 0 7 7 0 8 0 amappl7 128 170 0 154 1 0 1 1 0 8 0 amappl6 120 1473 0 1446 2 1 1 2 0 8 0 amappl5 112 919 0 904 1 0 1 1 0 8 0 amappl4 104 1569 0 1513 3 1 2 3 0 8 0 amappl3 96 152180 0 152120 3 0 3 3 0 8 0 amappl2 88 27115 0 27030 6 3 3 4 0 8 0 amappl1 80 102368 0 101831 23 10 13 23 0 8 0 amappl 88 246667 0 246391 10 2 8 8 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 25626 0 25411 2 0 2 2 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 25626 0 25411 2 0 2 2 0 8 0 vmmpekpl 168 180164 0 180059 6 0 6 6 0 8 0 vmmpepl 168 1517669 0 1515048 583 420 163 171 0 357 11 vmsppl 448 25625 0 25411 27 2 25 25 0 8 0 rwobjpl 56 364470 0 355184 160 27 133 139 0 8 0 pdppl 4096 51259 0 51013 1127 873 254 260 0 8 8 pvpl 32 48889 0 0 395 0 395 395 0 265 0 pmappl 248 25625 0 25411 15 1 14 14 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 2436 0 1547 27 1 26 27 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 __mp_release_all(ffffffff82d60af0) at __mp_release_all+0x9d sys/kern/kern_lock.c:197 tsleep(fffffd806f783120,11,ffffffff8284d30c,0) at tsleep+0x161 sys/kern/kern_synch.c:146 getblk(fffffd807efb6af8,65500,4000,0,ffffffffffffffff) at getblk+0x137 sys/kern/vfs_bio.c:1025 bread(fffffd807efb6af8,65500,4000,ffff80002a15e458) at bread+0x3e bio_doread sys/kern/vfs_bio.c:430 [inline] bread(fffffd807efb6af8,65500,4000,ffff80002a15e458) at bread+0x3e sys/kern/vfs_bio.c:475 ffs_update(fffffd806e7b0448,0) at ffs_update+0x14c sys/ufs/ffs/ffs_inode.c:91 VOP_FSYNC(fffffd806e5bd7e8,fffffd807f7d7ea0,3,ffff80002a145ff8) at VOP_FSYNC+0xcf sys/kern/vfs_vops.c:311 syncer_thread(ffff80002a145ff8) at syncer_thread+0x211 sys/kern/vfs_sync.c:161 end trace frame: 0x0, count: 5 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 __mp_release_all(ffffffff82d60af0) at __mp_release_all+0x9d sys/kern/kern_lock.c:197 tsleep(fffffd806f783120,11,ffffffff8284d30c,0) at tsleep+0x161 sys/kern/kern_synch.c:146 getblk(fffffd807efb6af8,65500,4000,0,ffffffffffffffff) at getblk+0x137 sys/kern/vfs_bio.c:1025 bread(fffffd807efb6af8,65500,4000,ffff80002a15e458) at bread+0x3e bio_doread sys/kern/vfs_bio.c:430 [inline] bread(fffffd807efb6af8,65500,4000,ffff80002a15e458) at bread+0x3e sys/kern/vfs_bio.c:475 ffs_update(fffffd806e7b0448,0) at ffs_update+0x14c sys/ufs/ffs/ffs_inode.c:91 VOP_FSYNC(fffffd806e5bd7e8,fffffd807f7d7ea0,3,ffff80002a145ff8) at VOP_FSYNC+0xcf sys/kern/vfs_vops.c:311 syncer_thread(ffff80002a145ff8) at syncer_thread+0x211 sys/kern/vfs_sync.c:161 end trace frame: 0x0, count: -10