kernel: protection fault trap, code=0 Stopped at malloc+0x855: movq 0x8(%rbx),%r14 ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> show kasan No such command ddb{1}> 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(fffffa806d1deb90,fffffa806b1417b0,2,0,c979969000,c979969001) at amap_copy+0x6ac sys/uvm/uvm_amap.c:567 uvm_fault_check(ffff8000343d0010,ffff8000343d0048,ffff8000343d0080,0) at uvm_fault_check+0x473 sys/uvm/uvm_fault.c:747 uvm_fault(fffffa806d1deb90,c979969000,0,2) at uvm_fault+0x106 sys/uvm/uvm_fault.c:627 upageflttrap(ffff8000343d01b0,c979969a88) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff8000343d01b0) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end trace frame: 0x0, count: -9 ddb{1}> show registers rdi 0xf6e57533b0798c9d rsi 0x7fff00007fff rbp 0xffff8000343cfcb0 rbx 0xf6e50accb079f362 rdx 0 rcx 0xffff800045fe7778 rax 0xffff80002999dff0 r8 0xc979969000 r9 0xc979969001 r10 0 r11 0xfb2cb273d85c9b5a r12 0x7fff00007fff r13 0xffffffff83b02510 kmemstats+0x1880 r14 0xa30c333 __kernel_phys_end+0x670c333 r15 0xf6e57533b0798c9d rip 0xffffffff82cc4205 malloc+0x855 cs 0x8 rflags 0x10282 __ALIGN_SIZE+0xf282 rsp 0xffff8000343cfbf0 ss 0 malloc+0x855: movq 0x8(%rbx),%r14 ddb{1}> show proc PROC (syz-executor) tid=347608 pid=63886 tcnt=2 stat=onproc flags process=10 proc=4000000 runpri=50, usrpri=50, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800045fe6550,0xffff800045fe6a90 process=0xffff800038fcc9c0 user=0xffff8000343cb000, vmspace=0xfffffa806d1deb90 estcpu=10, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 90360 519490 10595 32767 2 0x10 0 syz-executor 90360 221244 10595 32767 2 0x10 0x4000000 syz-executor 63886 503233 87119 32767 7 0x10 0 syz-executor *63886 347608 87119 32767 7 0x10 0x4000000 syz-executor 44794 311119 36693 32767 2 0x10 0 syz-executor 36872 32893 65423 32767 2 0x10 0 syz-executor 36872 393617 65423 32767 3 0x10 0x4000080 fsleep syz-executor 78394 165563 7988 32767 2 0x10 0 syz-executor 86901 256843 75480 32767 2 0x10 0 syz-executor 86901 514218 75480 32767 3 0x10 0x4000080 fsleep syz-executor 3322 212645 59400 32767 2 0x10 0 syz-executor 92670 479661 86072 0 2 0x2 0 syz-executor 36693 184292 89161 32767 3 0x10 0x80 nanoslp syz-executor 89161 214253 86072 0 3 0x2 0x80 wait syz-executor 10595 29229 35324 32767 3 0x10 0x80 nanoslp syz-executor 65423 138585 75806 32767 2 0x10 0 syz-executor 7988 46203 6018 32767 3 0x10 0x80 nanoslp syz-executor 75480 520741 76493 32767 3 0x10 0x80 nanoslp syz-executor 87119 410714 36603 32767 3 0x10 0x80 nanoslp syz-executor 59400 175197 11519 32767 3 0x10 0x80 nanoslp syz-executor 35324 30660 86072 0 3 0x2 0x80 wait syz-executor 75806 229422 86072 0 3 0x2 0x80 wait syz-executor 6018 90206 86072 0 3 0x2 0x80 wait syz-executor 76493 110460 86072 0 3 0x2 0x80 wait syz-executor 11519 346699 86072 0 3 0x2 0x80 wait syz-executor 36603 480863 86072 0 3 0x2 0x80 wait syz-executor 86072 487828 48126 0 3 0x2 0x80 kqread syz-executor 48126 218335 55987 0 3 0x100002 0x88 sigsusp ksh 55987 440029 89348 0 3 0x10 0x88 kqread sshd-session 89348 160399 35361 0 3 0x12 0x80 kqread sshd-session 21168 99640 1 0 3 0x100003 0x80 ttyin getty 35361 263500 1 0 3 0 0x88 kqread sshd 55170 362489 11843 73 3 0x1100010 0x80 kqread syslogd 11843 339303 1 0 3 0x100002 0x80 sbwait syslogd 9204 257922 1 0 3 0x100000 0x80 kqread resolvd 64247 252969 47261 77 3 0x100012 0x80 kqread dhcpleased 15911 365076 47261 77 3 0x100012 0x80 kqread dhcpleased 47261 420192 1 0 3 0 0x80 kqread dhcpleased 14625 469413 0 0 3 0x14000 0x200 bored smr 89561 61194 0 0 2 0x14000 0x200 zerothread 96403 439585 0 0 3 0x14000 0x200 aiodoned aiodoned 17820 82722 0 0 3 0x14000 0x200 syncer update 31297 320386 0 0 3 0x14000 0x200 cleaner cleaner 28417 120294 0 0 3 0x14000 0x200 reaper reaper 47202 198018 0 0 3 0x14000 0x200 pgdaemon pagedaemon 85760 127262 0 0 3 0x14000 0x200 bored viomb 62294 223905 0 0 3 0x14000 0x40000200 acpi0 acpi0 71596 83782 0 0 3 0x14000 0x40000200 idle1 22463 31598 0 0 3 0x14000 0x200 bored softnet1 56169 324503 0 0 3 0x14000 0x200 bored softnet0 48086 235584 0 0 3 0x14000 0x200 bored systqmp 73764 238888 0 0 3 0x14000 0x200 bored systq 86807 127768 0 0 3 0x14000 0x200 tmoslp softclockmp 88563 165008 0 0 3 0x14000 0x40000200 tmoslp softclock 19958 73777 0 0 3 0x14000 0x40000200 idle0 1 341331 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 /syzkaller/managers/setuid/kernel/sys/kern/kern_malloc.c:96 r = 0 (0xffffffff8399df38) #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 63886 (syz-executor) thread 0xffff800045fe7778 (347608) exclusive rwlock vmmaplk r = 0 (0xfffffa806d1dec90) #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 (0xffffffff8399df38) #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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11048 12016K 12034K 166960K 12145 0 pcb 17 12K 12K 166960K 17 0 rtable 223 6K 7K 166960K 393 0 pf 29 16K 16K 166960K 33 0 ifaddr 38 6K 7K 166960K 48 0 ifgroup 46 2K 2K 166960K 54 0 sysctl 1 1K 9K 166960K 6 0 counters 68 36K 37K 166960K 72 0 ioctlops 0 0K 4K 166960K 36 0 iov 0 0K 8K 166960K 38 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1287 81K 81K 166960K 1475 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 6 0 VM map 2 1K 1K 166960K 2 0 sem 12 1K 1K 166960K 24 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 24 86K 129K 166960K 350 0 sigio 0 0K 0K 166960K 2 0 proc 58 99K 163K 166960K 544 0 subproc 63 3K 4K 166960K 180 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 14 0 in_multi 88 6K 7K 166960K 113 0 ether_multi 1 0K 0K 166960K 1 0 mrt 2 0K 0K 166960K 12 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 67 307K 307K 166960K 67 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 211 158K 184K 166960K 4345 0 UVM aobj 7 4K 4K 166960K 8 0 pinsyscall 45 90K 112K 166960K 1458 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 7 0 NDP 10 0K 2K 166960K 30 0 temp 40 9116K 9121K 166960K 4291 0 kqueue 13 20K 26K 166960K 61 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 48 0 45 1 0 1 1 0 8 0 rtentry 176 126 0 23 6 0 6 6 0 8 0 unpcb 144 125 0 109 1 0 1 1 0 8 0 syncache 336 7 0 7 1 0 1 1 0 8 1 tcpqe 32 4 0 4 1 0 1 1 0 8 1 tcpcb 736 59 0 54 2 0 2 2 0 8 1 arp 136 20 0 4 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 328 185 0 176 2 0 2 2 0 8 1 ip6q 72 1 0 0 1 0 1 1 0 8 0 ip6af 40 1 0 0 1 0 1 1 0 8 0 nd6 152 31 0 6 2 0 2 2 0 8 0 kcovpl 48 20 0 13 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 530 0 88 31 0 31 31 0 8 1 art_table 40 531 0 88 5 0 5 5 0 8 0 art_node 32 126 0 32 1 0 1 1 0 8 0 sysvmsgpl 40 11 0 5 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 72 16 0 6 1 0 1 1 0 8 0 shmpl 112 5 0 1 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1779 0 304 93 0 93 93 0 8 0 ffsino 296 1779 0 304 114 0 114 114 0 8 0 nchpl 144 2175 0 473 64 0 64 64 0 8 0 vnodes 216 1968 0 0 110 0 110 110 0 8 0 namei 1024 6593 0 6593 2 0 2 2 0 8 2 percpumem 16 52 0 2 1 0 1 1 0 8 0 kstatmem 264 27 0 4 2 0 2 2 0 8 0 scxspl 216 7204 0 7204 4 3 1 3 1 8 1 plimitpl 152 82 0 60 2 0 2 2 0 8 1 sigapl 424 617 0 565 7 0 7 7 0 8 0 knotepl 120 311 0 0 10 0 10 10 0 8 0 kqueuepl 224 102 0 93 3 0 3 3 0 8 2 pipepl 344 213 0 186 6 0 6 6 0 8 3 fdescpl 528 601 0 565 4 0 4 4 0 8 1 filepl 160 2498 0 2302 13 0 13 13 0 8 4 lockfpl 104 42 0 40 1 0 1 1 0 8 0 lockfspl 48 19 0 17 1 0 1 1 0 8 0 sessionpl 144 41 0 26 1 0 1 1 0 8 0 pgrppl 48 127 0 104 1 0 1 1 0 8 0 ucredpl 104 290 0 272 1 0 1 1 0 8 0 zombiepl 144 565 0 565 1 0 1 1 0 8 1 processpl 1232 617 0 565 5 0 5 5 0 8 0 procpl 664 848 0 792 6 0 6 6 0 8 0 sosppl 176 2 0 2 1 0 1 1 0 8 1 sockpl 752 359 0 331 4 0 4 4 0 8 1 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 112 0 0 14 0 14 14 0 8 0 mcl2k 2048 17 0 0 3 0 3 3 0 8 0 mextrefs 64 15 0 0 1 0 1 1 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 1201 0 0 76 0 76 76 0 8 0 bufpl 272 2414 0 102 155 0 155 155 0 8 0 anonpl 32 5332 0 0 43 0 43 43 0 247 0 amapchunkpl 152 13536 0 13105 37 0 37 37 0 158 17 amappl16 200 1740 0 1720 5 3 2 5 0 8 0 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 413 0 412 1 0 1 1 0 8 0 amappl13 176 117 0 107 1 0 1 1 0 8 0 amappl12 168 836 0 804 2 0 2 2 0 8 0 amappl11 160 5 0 5 2 2 0 1 0 8 0 amappl10 152 61 0 51 1 0 1 1 0 8 0 amappl9 144 274 0 274 1 1 0 1 0 8 0 amappl8 136 94 0 93 1 0 1 1 0 8 0 amappl7 128 141 0 129 1 0 1 1 0 8 0 amappl6 120 158 0 157 1 0 1 1 0 8 0 amappl5 112 98 0 90 1 0 1 1 0 8 0 amappl4 104 264 0 248 1 0 1 1 0 8 0 amappl3 96 2435 0 2331 5 1 4 4 0 8 0 amappl2 88 536 0 482 2 0 2 2 0 8 0 amappl1 80 11443 0 10873 16 0 16 16 0 8 2 amappl 88 3618 0 3468 5 0 5 5 0 92 0 uvmvnodes 80 100 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 7 0 1 1 0 1 1 0 8 0 uaddrrnd 24 601 0 565 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 601 0 565 1 0 1 1 0 8 0 vmmpekpl 168 7148 0 7109 3 0 3 3 0 8 0 vmmpepl 168 47081 0 45142 99 0 99 99 0 357 14 vmsppl 488 600 0 565 7 1 6 6 0 8 1 rwobjpl 80 16098 0 15201 24 0 24 24 0 8 3 pdppl 4096 1209 0 1130 111 30 81 99 0 8 2 pvpl 32 13343 0 0 108 0 108 108 0 265 0 pmappl 256 600 0 565 4 1 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 502 0 33 14 0 14 14 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff8398bff0) 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 end of kernel end trace frame: 0x7b6e98728750, count: -3 ddb{0}> machine ddbcpu 1 Stopped at malloc+0x855: movq 0x8(%rbx),%r14 ddb{1}> 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(fffffa806d1deb90,fffffa806b1417b0,2,0,c979969000,c979969001) at amap_copy+0x6ac sys/uvm/uvm_amap.c:567 uvm_fault_check(ffff8000343d0010,ffff8000343d0048,ffff8000343d0080,0) at uvm_fault_check+0x473 sys/uvm/uvm_fault.c:747 uvm_fault(fffffa806d1deb90,c979969000,0,2) at uvm_fault+0x106 sys/uvm/uvm_fault.c:627 upageflttrap(ffff8000343d01b0,c979969a88) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff8000343d01b0) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end trace frame: 0x0, count: -9