login: uvm_fault(WARNING: SPL NOT LOWERED ON SYSCALL 83 1542414960 EXIT 0 9 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND *276946 81324 0 0 0 1 syz-executor 445907 81324 0 0 0x4000000 0 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x738e68f902b0, count: 14 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 *cpu0: uvm_fault(0xfffffd806cf413e8, 0x98, 0, 1) -> e ddb{1}> show kasan No such command ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x738e68f902b0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff8000353941d0 rbx 0 rdx 0 rcx 0xffff80002a220a80 rax 0x3b r8 0xffff800035394100 r9 0x1 r10 0xfe6395ae82ba582a r11 0x607d68118fc1e05 r12 0 r13 0 r14 0xffff80002a220a80 r15 0 rip 0xffffffff8140b3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff800035394150 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=276946 pid=81324 tcnt=4 stat=onproc flags process=0 proc=0 runpri=50, usrpri=50, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a2202b8,0xffff80002a221cb8 process=0xffff800045fe9358 user=0xffff80003538f000, vmspace=0xfffffd806cf413e8 estcpu=36, cpticks=1, pctcpu=0.0, user=1, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 73047 174983 95581 0 2 0 0 syz-executor 73047 374187 95581 0 2 0 0x4000000 syz-executor *81324 276946 96280 0 7 0 0 syz-executor 81324 445907 96280 0 7 0 0x4000000 syz-executor 81324 234133 96280 0 3 0 0x4000080 fsleep syz-executor 81324 144321 96280 0 3 0 0x4000080 fsleep syz-executor 5406 289114 18260 0 2 0 0 syz-executor 5406 137961 18260 0 2 0 0x4000000 syz-executor 5406 253318 18260 0 3 0 0x4000080 fsleep syz-executor 53649 450023 5995 0 2 0 0 syz-executor 53649 503686 5995 0 3 0 0x4000080 fsleep syz-executor 71712 327511 37620 0 2 0 0 syz-executor 71712 355544 37620 0 3 0 0x4000080 fsleep syz-executor 9940 126103 16890 0 2 0 0 syz-executor 9940 127959 16890 0 3 0 0x4000080 fsleep syz-executor 24396 286549 72095 0 2 0 0 syz-executor 24396 99792 72095 0 3 0 0x4000080 fsleep syz-executor 72095 168990 78491 0 3 0x2 0x80 nanoslp syz-executor 16890 273318 78491 0 3 0x2 0x80 nanoslp syz-executor 37620 490613 78491 0 3 0x2 0x80 nanoslp syz-executor 18260 213257 78491 0 3 0x2 0x80 nanoslp syz-executor 27322 395447 78491 0 3 0x2 0 biowait syz-executor 95581 441210 78491 0 3 0x2 0x80 nanoslp syz-executor 96280 115777 78491 0 3 0x2 0x80 nanoslp syz-executor 5995 509131 78491 0 3 0x2 0x80 nanoslp syz-executor 78491 233396 69285 0 2 0x2 0x80 syz-executor 69285 217877 16543 0 3 0x100002 0x88 sigsusp ksh 16543 93400 14512 0 3 0x10 0x88 kqread sshd-session 14512 207616 25104 0 3 0x12 0x80 kqread sshd-session 2260 151831 1 0 3 0x100003 0x80 ttyin getty 25104 163303 1 0 3 0 0x88 kqread sshd 62973 35259 93974 74 3 0x1100012 0x80 bpf pflogd 93974 238364 1 0 3 0 0x80 sbwait pflogd 65555 324594 28053 73 3 0x1100010 0x80 kqread syslogd 28053 294111 1 0 3 0x100002 0x80 sbwait syslogd 19143 264873 1 0 3 0x100000 0x80 kqread resolvd 97901 506082 41683 77 3 0x100012 0x80 kqread dhcpleased 37828 244297 41683 77 3 0x100012 0x80 kqread dhcpleased 41683 144478 1 0 3 0 0x80 kqread dhcpleased 60429 480562 0 0 3 0x14000 0x200 bored smr 13340 403206 0 0 2 0x14000 0x200 zerothread 64760 128477 0 0 3 0x14000 0x200 aiodoned aiodoned 18953 178340 0 0 3 0x14000 0x200 syncer update 58936 78107 0 0 3 0x14000 0x200 cleaner cleaner 4660 84389 0 0 3 0x14000 0x200 reaper reaper 35202 240132 0 0 3 0x14000 0x200 pgdaemon pagedaemon 26471 438668 0 0 3 0x14000 0x200 bored viomb 83055 2296 0 0 3 0x14000 0x40000200 acpi0 acpi0 44529 462792 0 0 3 0x14000 0x40000200 idle1 89436 171561 0 0 3 0x14000 0x200 bored softnet1 95142 348414 0 0 2 0x14000 0x200 softnet0 14811 258113 0 0 3 0x14000 0x200 bored systqmp 43557 275772 0 0 3 0x14000 0x200 bored systq 27784 145343 0 0 3 0x14000 0x200 tmoslp softclockmp 13353 200219 0 0 3 0x14000 0x40000200 tmoslp softclock 54161 382649 0 0 3 0x14000 0x40000200 idle0 1 310444 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex sbsnd r = 0 (0xffff8000015aadf8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487 #2 tcp_input_solocked+0x47ae sys/netinet/tcp_input.c:1741 #3 tcp_input_mlist+0x93 sys/netinet/tcp_input.c:-1 #4 if_input_process+0x526 sys/net/if.c:1086 #5 ifiq_process+0xcd sys/net/ifq.c:864 #6 taskq_thread+0x157 sys/kern/kern_task.c:446 #7 proc_trampoline+0x10 Process 81324 (syz-executor) thread 0xffff80002a222d08 (445907) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839f8700) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] #1 syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 #2 Xsyscall+0x128 Process 27322 (syz-executor) thread 0xffff800045fef4d8 (395447) exclusive rrwlock inode r = 0 (0xfffffd806cd6d1f0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576 #5 uvm_vnp_uncache+0x1c4 sys/uvm/uvm_vnode.c:1385 #6 dounlinkat+0x1a1 sys/kern/vfs_syscalls.c:1843 #7 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #7 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #8 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806cd6da08) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576 #5 vget+0x2a2 sys/kern/vfs_subr.c:692 #6 cache_lookup+0x351 sys/kern/vfs_cache.c:222 #7 ufs_lookup+0x1e3 sys/ufs/ufs/ufs_lookup.c:160 #8 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #9 vfs_lookup+0x963 sys/kern/vfs_lookup.c:580 #10 namei+0x7c5 sys/kern/vfs_lookup.c:250 #11 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1807 #12 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #13 Xsyscall+0x128 Process 95142 (softnet0) thread 0xffff800045ffef90 (348414) exclusive rwlock inet46 r = 0 (0xffff8000015aabf0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 in_pcbsolock+0xdb sys/netinet/in_pcb.c:631 #3 tcp_input_solocked+0xa9a sys/netinet/tcp_input.c:-1 #4 tcp_input_mlist+0x93 sys/netinet/tcp_input.c:-1 #5 if_input_process+0x526 sys/net/if.c:1086 #6 ifiq_process+0xcd sys/net/ifq.c:864 #7 taskq_thread+0x157 sys/kern/kern_task.c:446 #8 proc_trampoline+0x10 shared rwlock netlock r = 0 (0xffffffff838f6210) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 if_input_process+0x1c9 sys/net/if.c:1061 #3 ifiq_process+0xcd sys/net/ifq.c:864 #4 taskq_thread+0x157 sys/kern/kern_task.c:446 #5 proc_trampoline+0x10 shared rwlock softnet0 r = 0 (0xffff80000002c078) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11056 12086K 12113K 166960K 12157 0 pcb 19 12K 12K 166960K 21 0 rtable 237 6K 7K 166960K 359 0 pf 34 17K 24K 166960K 53 0 ifaddr 43 7K 7K 166960K 45 0 ifgroup 55 2K 2K 166960K 55 0 sysctl 1 1K 9K 166960K 5 0 counters 70 37K 37K 166960K 70 0 ioctlops 0 0K 4K 166960K 1486 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1296 82K 82K 166960K 1372 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 1K 166960K 2 0 VM map 2 1K 1K 166960K 2 0 sem 2 0K 0K 166960K 2 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 17 61K 93K 166960K 146 0 proc 70 115K 164K 166960K 553 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 in_multi 99 6K 6K 166960K 99 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 49 228K 228K 166960K 49 0 exec 0 0K 1K 166960K 394 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 234 176K 186K 166960K 3295 0 UVM aobj 3 2K 2K 166960K 3 0 pinsyscall 42 84K 104K 166960K 1342 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 2 0 NDP 28 2K 2K 166960K 28 0 temp 35 9114K 9120K 166960K 4189 0 kqueue 13 20K 24K 166960K 29 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> 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 34 1 0 1 1 0 8 0 rtentry 176 111 0 1 5 0 5 5 0 8 0 unpcb 144 40 0 23 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 10 0 6 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 72 0 62 1 0 1 1 0 8 0 nd6 152 24 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 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 pfanchor 1288 4 0 0 1 0 1 1 0 8 0 pfstitem 24 18 0 0 1 0 1 1 0 8 0 pfstkey 128 18 0 0 1 0 1 1 0 8 0 pfstate 448 18 0 0 2 0 2 2 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 453 0 0 29 0 29 29 0 8 0 art_table 40 454 0 0 5 0 5 5 0 8 0 art_node 32 111 0 11 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1579 0 108 93 0 93 93 0 8 0 ffsino 296 1579 0 108 114 0 114 114 0 8 0 nchpl 144 1789 0 87 64 0 64 64 0 8 0 vnodes 216 1677 0 0 94 0 94 94 0 8 0 namei 1024 5580 0 5580 2 0 2 2 0 8 2 percpumem 16 51 0 0 1 0 1 1 0 8 0 kstatmem 264 27 0 0 2 0 2 2 0 8 0 scxspl 216 6157 0 6156 4 2 2 3 1 8 1 plimitpl 152 33 0 16 1 0 1 1 0 8 0 sigapl 424 475 0 428 7 0 7 7 0 8 1 knotepl 120 57 0 0 2 0 2 2 0 8 0 kqueuepl 224 27 0 17 1 0 1 1 0 8 0 pipepl 344 130 0 103 3 0 3 3 0 8 0 fdescpl 528 459 0 428 3 0 3 3 0 8 0 filepl 160 1652 0 1425 10 0 10 10 0 8 0 lockfpl 104 10 0 8 1 0 1 1 0 8 0 lockfspl 48 6 0 4 1 0 1 1 0 8 0 sessionpl 144 26 0 16 1 0 1 1 0 8 0 pgrppl 48 35 0 17 1 0 1 1 0 8 0 ucredpl 104 112 0 99 1 0 1 1 0 8 0 zombiepl 144 428 0 428 1 0 1 1 0 8 1 processpl 1232 475 0 428 5 0 5 5 0 8 1 procpl 664 495 0 438 5 0 5 5 0 8 0 sockpl 752 149 0 119 4 0 4 4 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 116 0 0 15 0 15 15 0 8 0 mcl2k 2048 17 0 0 3 0 3 3 0 8 0 mextrefs 64 17 0 0 1 0 1 1 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 124 0 0 8 0 8 8 0 8 0 bufpl 272 2304 0 105 147 0 147 147 0 8 0 anonpl 32 5365 0 0 44 0 44 44 0 247 0 amapchunkpl 152 9097 0 8479 33 0 33 33 0 158 8 amappl16 200 1606 0 1588 5 0 5 5 0 8 4 amappl15 192 6 0 6 1 0 1 1 0 8 1 amappl14 184 444 0 443 1 0 1 1 0 8 0 amappl13 176 124 0 112 1 0 1 1 0 8 0 amappl12 168 713 0 683 2 0 2 2 0 8 0 amappl11 160 6 0 6 1 0 1 1 0 8 1 amappl10 152 66 0 52 1 0 1 1 0 8 0 amappl9 144 276 0 276 1 0 1 1 0 8 1 amappl8 136 108 0 106 1 0 1 1 0 8 0 amappl7 128 152 0 139 1 0 1 1 0 8 0 amappl6 120 161 0 160 1 0 1 1 0 8 0 amappl5 112 98 0 88 1 0 1 1 0 8 0 amappl4 104 396 0 373 1 0 1 1 0 8 0 amappl3 96 1505 0 1409 3 0 3 3 0 8 0 amappl2 88 585 0 511 2 0 2 2 0 8 0 amappl1 80 10558 0 9951 15 0 15 15 0 8 1 amappl 88 2540 0 2379 4 0 4 4 0 92 0 uvmvnodes 80 99 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 128 253 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 24 459 0 428 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 459 0 428 1 0 1 1 0 8 0 vmmpekpl 168 5856 0 5824 2 0 2 2 0 8 0 vmmpepl 168 38860 0 36962 86 0 86 86 0 357 1 vmsppl 488 458 0 428 5 0 5 5 0 8 1 rwobjpl 80 14622 0 13600 24 0 24 24 0 8 1 pdppl 4096 925 0 856 105 20 85 85 0 8 16 pvpl 32 11263 0 0 92 1 91 91 0 265 0 pmappl 256 458 0 428 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 419 0 23 12 0 12 12 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83954ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff839f7f00) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839f7f00) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff80003c3e1c00,ffff8000002a2900) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f Xspllower() at Xspllower+0x1d cnputc(28) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(28) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff83462238) at db_printf+0x9b sys/kern/subr_prf.c:-1 fault(ffffffff83524a1d) at fault+0xa7 sys/arch/amd64/amd64/trap.c:161 kpageflttrap(ffff80003c3e20b0,98) at kpageflttrap+0x37d sys/arch/amd64/amd64/trap.c:296 kerntrap(ffff80003c3e20b0) at kerntrap+0x19d sys/arch/amd64/amd64/trap.c:528 end trace frame: 0xffff80003c3e2130, count: 0 ddb{0}> trace x86_ipi_db(ffffffff83954ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff839f7f00) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839f7f00) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff80003c3e1c00,ffff8000002a2900) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f Xspllower() at Xspllower+0x1d cnputc(28) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(28) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff83462238) at db_printf+0x9b sys/kern/subr_prf.c:-1 fault(ffffffff83524a1d) at fault+0xa7 sys/arch/amd64/amd64/trap.c:161 kpageflttrap(ffff80003c3e20b0,98) at kpageflttrap+0x37d sys/arch/amd64/amd64/trap.c:296 kerntrap(ffff80003c3e20b0) at kerntrap+0x19d sys/arch/amd64/amd64/trap.c:528 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff80002a222d08,fffffd806cc21d90,ffff80003c3e2290) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691 sys_futimes(ffff80002a222d08,ffff80003c3e23e0,ffff80003c3e2330) at sys_futimes+0x208 sys/kern/vfs_syscalls.c:2733 syscall(ffff80003c3e23e0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3e23e0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8a760a83a80, count: -19 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x738e68f902b0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x738e68f902b0, count: -1