kernel: protection fault trap, code=0 Stopped at malloc+0x855: movq 0x8(%rbx),%r14 ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> show kasan No such command ddb{0}> trace malloc(10,62,2) at malloc+0x855 sys/kern/kern_malloc.c:294 amap_alloc1(20,2,0) at amap_alloc1+0x291 sys/uvm/uvm_amap.c:353 amap_alloc(20000,2,0) at amap_alloc+0xad sys/uvm/uvm_amap.c:-1 amap_copy(fffff4006ce7a9b8,fffff4006d0b01c8,2,0,76c959a5000,76c959a5001) at amap_copy+0x6ac sys/uvm/uvm_amap.c:567 uvm_fault_check(ffff80003c407410,ffff80003c407448,ffff80003c407480,0) at uvm_fault_check+0x473 sys/uvm/uvm_fault.c:747 uvm_fault(fffff4006ce7a9b8,76c959a5000,0,2) at uvm_fault+0x106 sys/uvm/uvm_fault.c:627 upageflttrap(ffff80003c4075b0,76c959a5978) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c4075b0) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end trace frame: 0x0, count: -9 ddb{0}> show registers rdi 0xd1a3faffe5c3a60a rsi 0 rbp 0xffff80003c4070b0 rbx 0xd1a3faffe5c3a60a rdx 0 rcx 0xffff80003c412a90 rax 0xffffffff8392dff0 cpu_info_full_primary+0x1ff0 r8 0x76c959a5000 r9 0x76c959a5001 r10 0 r11 0x565c38b8437c7c02 r12 0 r13 0xffffffff83aad620 kmemstats+0x1880 r14 0xa30c333 __kernel_phys_end+0x670c333 r15 0xd1a3faffe5c3a60a rip 0xffffffff822b36a5 malloc+0x855 cs 0x8 rflags 0x10286 __ALIGN_SIZE+0xf286 rsp 0xffff80003c406ff0 ss 0 malloc+0x855: movq 0x8(%rbx),%r14 ddb{0}> show proc PROC (syz-executor) tid=428643 pid=34226 tcnt=2 stat=onproc flags process=10 proc=4000000 runpri=78, usrpri=78, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c413788,0xffff80003c413cc8 process=0xffff80003c3d5d00 user=0xffff80003c402000, vmspace=0xfffff4006ce7a9b8 estcpu=28, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 34226 82816 87886 32767 2 0x10 0 syz-executor *34226 428643 87886 32767 7 0x10 0x4000000 syz-executor 36039 225681 52660 32767 2 0x10 0xc80 syz-executor 36039 47813 52660 32767 3 0x10 0x4000080 fsleep syz-executor 36039 62868 52660 32767 2 0x10 0x4000000 syz-executor 36039 215861 52660 32767 3 0x10 0x4000080 fsleep syz-executor 99566 424098 98305 32767 2 0x10 0 syz-executor 99566 189632 98305 32767 2 0x10 0x4000000 syz-executor 99566 346405 98305 32767 7 0x10 0x4000000 syz-executor 59420 85905 54896 32767 2 0x10 0xc80 syz-executor 59420 136379 54896 32767 3 0x10 0x4000080 kqsel syz-executor 59420 8533 54896 32767 3 0x10 0x4000080 fsleep syz-executor 21379 442189 83361 0 3 0x100002 0x80 sbwait arp 83361 400886 70170 0 3 0x100002 0x88 sigsusp sh 54896 27795 60905 32767 2 0x10 0xc80 syz-executor 52660 313352 27874 32767 2 0x10 0xc80 syz-executor 87886 15582 53876 32767 3 0x10 0x80 nanoslp syz-executor 23057 8775 15 32767 2 0x10 0xc80 syz-executor 98305 437048 89597 32767 2 0x10 0xc80 syz-executor 70170 371702 83910 0 3 0 0x80 wait syz-executor 65208 310249 74794 32767 3 0x10 0x80 piperd syz-executor 89597 474947 70653 0 3 0x2 0x80 wait syz-executor 83910 129590 70653 0 3 0x2 0x80 wait syz-executor 53876 253115 70653 0 3 0x2 0x80 wait syz-executor 60905 468201 70653 0 3 0x2 0x80 wait syz-executor 15 93121 70653 0 3 0x2 0x80 wait syz-executor 74794 66659 70653 0 3 0x2 0x80 wait syz-executor 27874 26411 70653 0 3 0x2 0x80 wait syz-executor 70653 338893 5031 0 3 0x2 0x80 nanoslp syz-executor 5031 438641 15664 0 3 0x100002 0x88 sigsusp ksh 15664 146675 50305 0 3 0x10 0x88 kqread sshd-session 50305 487752 11775 0 3 0x12 0x80 kqread sshd-session 62241 451508 1 0 3 0x100003 0x80 ttyin getty 11775 200949 1 0 3 0 0x88 kqread sshd 20938 24769 75460 73 3 0x1100010 0x80 kqread syslogd 75460 387789 1 0 3 0x100002 0x80 sbwait syslogd 92188 352177 1 0 3 0x100000 0x80 kqread resolvd 27239 51731 95969 77 3 0x100012 0x80 kqread dhcpleased 89840 74206 95969 77 3 0x100012 0x80 kqread dhcpleased 95969 267019 1 0 3 0 0x80 kqread dhcpleased 18573 91736 0 0 3 0x14000 0x200 bored smr 28776 431435 0 0 2 0x14000 0x200 zerothread 90354 293261 0 0 3 0x14000 0x200 aiodoned aiodoned 7084 396384 0 0 3 0x14000 0x200 syncer update 26825 349852 0 0 3 0x14000 0x200 cleaner cleaner 71111 57799 0 0 3 0x14000 0x200 reaper reaper 5622 503217 0 0 3 0x14000 0x200 pgdaemon pagedaemon 54779 391671 0 0 3 0x14000 0x200 bored viomb 56390 523588 0 0 3 0x14000 0x40000200 acpi0 acpi0 53315 69727 0 0 3 0x14000 0x40000200 idle1 74427 443469 0 0 3 0x14000 0x200 bored softnet1 61028 17693 0 0 3 0x14000 0x200 bored softnet0 27843 183762 0 0 3 0x14000 0x200 bored systqmp 59075 70499 0 0 3 0x14000 0x200 bored systq 66309 325369 0 0 3 0x14000 0x200 tmoslp softclockmp 46060 415977 0 0 3 0x14000 0x40000200 tmoslp softclock 92224 93312 0 0 3 0x14000 0x40000200 idle0 1 231083 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 /syzkaller/managers/setuid/kernel/sys/kern/kern_malloc.c:96 r = 0 (0xffffffff83962788) #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 malloc+0x2ef sys/kern/kern_malloc.c:200 #3 amap_alloc1+0x291 sys/uvm/uvm_amap.c:353 #4 amap_alloc+0xad sys/uvm/uvm_amap.c:-1 #5 amap_copy+0x6ac sys/uvm/uvm_amap.c:567 #6 uvm_fault_check+0x473 sys/uvm/uvm_fault.c:747 #7 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #8 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #9 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #10 recall_trap+0x8 Process 34226 (syz-executor) thread 0xffff80003c412a90 (428643) exclusive rwlock vmmaplk r = 0 (0xfffff4006ce7aab8) #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 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1880 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #7 recall_trap+0x8 exclusive mutex /syzkaller/managers/setuid/kernel/sys/kern/kern_malloc.c:96 r = 0 (0xffffffff83962788) #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 malloc+0x2ef sys/kern/kern_malloc.c:200 #3 amap_alloc1+0x291 sys/uvm/uvm_amap.c:353 #4 amap_alloc+0xad sys/uvm/uvm_amap.c:-1 #5 amap_copy+0x6ac sys/uvm/uvm_amap.c:567 #6 uvm_fault_check+0x473 sys/uvm/uvm_fault.c:747 #7 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #8 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #9 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #10 recall_trap+0x8 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11078 12020K 12034K 166960K 12174 0 pcb 17 12K 12K 166960K 17 0 rtable 201 5K 6K 166960K 343 0 pf 29 16K 16K 166960K 31 0 ifaddr 36 6K 7K 166960K 42 0 ifgroup 46 2K 2K 166960K 50 0 sysctl 3 1K 9K 166960K 8 0 counters 68 36K 37K 166960K 70 0 ioctlops 0 0K 4K 166960K 38 0 iov 0 0K 4K 166960K 4 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1288 81K 81K 166960K 1463 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 9K 166960K 10 0 VM map 2 1K 1K 166960K 2 0 sem 11 0K 0K 166960K 15 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 23 85K 129K 166960K 339 0 sigio 0 0K 0K 166960K 3 0 proc 58 99K 163K 166960K 520 0 subproc 63 3K 4K 166960K 135 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 22 0 in_multi 78 5K 6K 166960K 90 0 ether_multi 1 0K 0K 166960K 1 0 mrt 1 0K 0K 166960K 12 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 387 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 239 161K 186K 166960K 4666 0 UVM aobj 16 2K 2K 166960K 17 0 pinsyscall 45 90K 116K 166960K 1430 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 6 0 NDP 10 0K 1K 166960K 25 0 temp 36 9114K 9122K 166960K 4363 0 kqueue 14 22K 25K 166960K 57 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 49 0 45 1 0 1 1 0 8 0 rtentry 176 106 0 14 5 0 5 5 0 8 0 unpcb 144 302 0 287 2 0 2 2 0 8 1 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpcb 736 106 0 96 4 0 4 4 0 8 3 arp 136 18 0 2 1 0 1 1 0 8 0 ipq 40 1 0 0 1 0 1 1 0 8 0 ipqe 40 1 0 0 1 0 1 1 0 8 0 inpcb 328 285 0 271 4 0 4 4 0 8 2 nd6 152 23 0 5 1 0 1 1 0 8 0 kcovpl 48 15 0 8 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 416 0 48 26 0 26 26 0 8 2 art_table 40 417 0 48 5 0 5 5 0 8 0 art_node 32 106 0 22 1 0 1 1 0 8 0 semupl 112 2 0 2 1 0 1 1 0 8 1 semapl 72 13 0 4 1 0 1 1 0 8 0 shmpl 112 14 0 1 1 0 1 1 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 1875 0 405 92 0 92 92 0 8 0 ffsino 296 1875 0 405 114 0 114 114 0 8 0 nchpl 144 2362 0 664 64 0 64 64 0 8 0 vnodes 216 2019 0 0 113 0 113 113 0 8 0 namei 1024 7507 0 7507 1 0 1 1 0 8 1 percpumem 16 51 0 1 1 0 1 1 0 8 0 kstatmem 264 25 0 2 2 0 2 2 0 8 0 scxspl 216 8038 0 8038 10 2 8 8 1 8 8 plimitpl 152 267 0 244 2 0 2 2 0 8 1 sigapl 424 623 0 572 7 0 7 7 0 8 0 knotepl 120 95 0 0 3 0 3 3 0 8 0 kqueuepl 224 73 0 62 1 0 1 1 0 8 0 pipepl 344 192 0 165 3 0 3 3 0 8 0 fdescpl 528 607 0 572 4 0 4 4 0 8 0 filepl 160 2950 0 2746 13 0 13 13 0 8 2 lockfpl 104 48 0 46 1 0 1 1 0 8 0 lockfspl 48 21 0 19 1 0 1 1 0 8 0 sessionpl 144 70 0 55 1 0 1 1 0 8 0 pgrppl 48 87 0 65 1 0 1 1 0 8 0 ucredpl 104 548 0 531 1 0 1 1 0 8 0 zombiepl 144 573 0 572 1 0 1 1 0 8 0 processpl 1232 623 0 572 5 0 5 5 0 8 0 procpl 664 956 0 897 7 0 7 7 0 8 0 sosppl 176 6 0 6 1 0 1 1 0 8 1 sockpl 752 638 0 604 7 0 7 7 0 8 2 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 110 0 0 14 0 14 14 0 8 0 mcl2k 2048 30 0 0 4 0 4 4 0 8 0 mextrefs 64 30 0 0 1 0 1 1 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 1185 0 0 75 0 75 75 0 8 0 bufpl 272 2568 0 102 165 0 165 165 0 8 0 anonpl 32 7297 0 0 59 0 59 59 0 247 0 amapchunkpl 152 13985 0 13482 27 0 27 27 0 158 4 amappl16 200 1940 0 1920 14 2 12 14 0 8 8 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 410 0 408 1 0 1 1 0 8 0 amappl13 176 120 0 109 1 0 1 1 0 8 0 amappl12 168 839 0 806 2 0 2 2 0 8 0 amappl11 160 4 0 4 1 1 0 1 0 8 0 amappl10 152 70 0 60 1 0 1 1 0 8 0 amappl9 144 274 0 274 1 1 0 1 0 8 0 amappl8 136 108 0 106 1 0 1 1 0 8 0 amappl7 128 138 0 126 1 0 1 1 0 8 0 amappl6 120 161 0 159 1 0 1 1 0 8 0 amappl5 112 93 0 86 1 0 1 1 0 8 0 amappl4 104 260 0 243 1 0 1 1 0 8 0 amappl3 96 2647 0 2527 5 1 4 4 0 8 0 amappl2 88 524 0 469 2 0 2 2 0 8 0 amappl1 80 10845 0 10251 14 0 14 14 0 8 0 amappl 88 3939 0 3768 5 0 5 5 0 92 0 uvmvnodes 80 104 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 16 0 1 1 0 1 1 0 8 0 uaddrrnd 24 607 0 572 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 607 0 572 1 0 1 1 0 8 0 vmmpekpl 168 7054 0 7012 3 0 3 3 0 8 0 vmmpepl 168 47164 0 45182 103 0 103 103 0 357 11 vmsppl 488 606 0 572 7 1 6 6 0 8 0 rwobjpl 80 16220 0 15233 26 0 26 26 0 8 3 pdppl 4096 1221 0 1144 113 30 83 99 0 8 6 pvpl 32 15885 0 0 130 1 129 129 0 265 0 pmappl 256 606 0 572 4 1 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 508 0 33 14 0 14 14 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace malloc(10,62,2) at malloc+0x855 sys/kern/kern_malloc.c:294 amap_alloc1(20,2,0) at amap_alloc1+0x291 sys/uvm/uvm_amap.c:353 amap_alloc(20000,2,0) at amap_alloc+0xad sys/uvm/uvm_amap.c:-1 amap_copy(fffff4006ce7a9b8,fffff4006d0b01c8,2,0,76c959a5000,76c959a5001) at amap_copy+0x6ac sys/uvm/uvm_amap.c:567 uvm_fault_check(ffff80003c407410,ffff80003c407448,ffff80003c407480,0) at uvm_fault_check+0x473 sys/uvm/uvm_fault.c:747 uvm_fault(fffff4006ce7a9b8,76c959a5000,0,2) at uvm_fault+0x106 sys/uvm/uvm_fault.c:627 upageflttrap(ffff80003c4075b0,76c959a5978) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c4075b0) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end trace frame: 0x0, count: -9 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff80002999dff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x25 kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x25 sys/dev/kcov.c:153 mtx_enter(ffffffff83962778) at mtx_enter+0x375 sys/kern/kern_lock.c:455 free(ffff800000c439f0,7f,7) at free+0x9f sys/kern/kern_malloc.c:393 sysctl_sysvipc(ffff80003c3f5948,1,200000000100,ffff80003c3f5978) at sysctl_sysvipc+0x69b sys/kern/kern_sysctl.c:-1 kern_sysctl(ffff80003c3f5944,2,200000000100,ffff80003c3f5978,0,37,5f673dbb13ed6689) at kern_sysctl+0x139 sys/kern/kern_sysctl.c:736 sys_sysctl(ffff80003c4134f0,ffff80003c3f5ab0,ffff80003c3f5a00) at sys_sysctl+0x3e5 sys/kern/kern_sysctl.c:-1 syscall(ffff80003c3f5ab0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3f5ab0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1b006023320, count: -11