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(fffffb006d15bba0,fffffb006cfc7808,2,0,18814a02000,18814a02001) at amap_copy+0x6ac sys/uvm/uvm_amap.c:567 uvm_fault_check(ffff80003c3e9010,ffff80003c3e9048,ffff80003c3e9080,0) at uvm_fault_check+0x473 sys/uvm/uvm_fault.c:747 uvm_fault(fffffb006d15bba0,18814a02000,0,2) at uvm_fault+0x106 sys/uvm/uvm_fault.c:627 upageflttrap(ffff80003c3e91b0,18814a02818) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c3e91b0) 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 0x25ccf67cb8e2f18a rsi 0 rbp 0xffff80003c3e8cb0 rbx 0x25ccf67cb8e2f18a rdx 0 rcx 0xffff80003c3e2fb8 rax 0xffffffff839c7ff0 cpu_info_full_primary+0x1ff0 r8 0x18814a02000 r9 0x18814a02001 r10 0 r11 0x491ee31f754d24b r12 0 r13 0xffffffff83aa6b30 kmemstats+0x1880 r14 0xa30c333 __kernel_phys_end+0x670c333 r15 0x25ccf67cb8e2f18a rip 0xffffffff81dfd135 malloc+0x855 cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff80003c3e8bf0 ss 0 malloc+0x855: movq 0x8(%rbx),%r14 ddb{0}> show proc PROC (syz-executor) tid=32847 pid=94745 tcnt=3 stat=onproc flags process=10 proc=4000000 runpri=86, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c3e22c0,0xffffffff83aa4000 process=0xffff80003c3cd360 user=0xffff80003c3e4000, vmspace=0xfffffb006d15bba0 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 10195 70958 53910 32767 2 0x1010 0x2000 syz-executor 94745 127473 9857 32767 7 0x10 0 syz-executor 94745 226459 9857 32767 3 0x10 0x4000080 kqpoll syz-executor *94745 32847 9857 32767 7 0x10 0x4000000 syz-executor 28029 502823 37017 32767 3 0x10 0x80 nanoslp syz-executor 28029 236136 37017 32767 3 0x10 0x4000080 lockf syz-executor 28029 198758 37017 32767 3 0x10 0x4000080 fsleep syz-executor 87811 132178 67780 32767 3 0x10 0x80 wait syz-executor 9857 383433 45832 32767 3 0x10 0x80 nanoslp syz-executor 7387 413106 27782 32767 3 0x10 0x80 wait syz-executor 53910 173202 92080 32767 3 0x10 0x80 nanoslp syz-executor 37017 329818 298 32767 3 0x10 0x80 nanoslp syz-executor 99747 521987 7572 32767 3 0x10 0x80 wait syz-executor 11154 401590 6531 32767 3 0x10 0x80 wait syz-executor 21897 223679 14748 32767 3 0x10 0x80 wait syz-executor 92080 161963 11495 0 3 0x2 0x80 wait syz-executor 298 364191 11495 0 3 0x2 0x80 wait syz-executor 27782 82153 11495 0 3 0x2 0x80 wait syz-executor 45832 474458 11495 0 3 0x2 0x80 wait syz-executor 67780 418943 11495 0 3 0x2 0x80 wait syz-executor 6531 4286 11495 0 3 0x2 0x80 wait syz-executor 7572 49871 11495 0 3 0x2 0x80 wait syz-executor 14748 48602 11495 0 3 0x2 0x80 wait syz-executor 11495 395304 55464 0 3 0x2 0x80 kqread syz-executor 55464 502593 31558 0 3 0x100002 0x88 sigsusp ksh 31558 459489 6594 0 3 0x10 0x88 kqread sshd-session 6594 103517 20898 0 3 0x12 0x80 kqread sshd-session 68467 246485 1 0 3 0x100003 0x80 ttyin getty 20898 5720 1 0 3 0 0x88 kqread sshd 97141 439023 37206 73 3 0x1100010 0x80 kqread syslogd 37206 298563 1 0 3 0x100002 0x80 sbwait syslogd 88572 199967 1 0 3 0x100000 0x80 kqread resolvd 24537 35998 38339 77 3 0x100012 0x80 kqread dhcpleased 70724 379071 38339 77 3 0x100012 0x80 kqread dhcpleased 38339 112770 1 0 3 0 0x80 kqread dhcpleased 68486 240882 0 0 3 0x14000 0x200 bored smr 42840 292450 0 0 3 0x14000 0x200 pgzero zerothread 72748 96588 0 0 3 0x14000 0x200 aiodoned aiodoned 31922 386705 0 0 3 0x14000 0x200 syncer update 16865 158598 0 0 3 0x14000 0x200 cleaner cleaner 17397 22759 0 0 3 0x14000 0x200 reaper reaper 12200 22331 0 0 3 0x14000 0x200 pgdaemon pagedaemon 46300 423056 0 0 3 0x14000 0x200 bored viomb 13308 240860 0 0 3 0x14000 0x40000200 acpi0 acpi0 88613 243563 0 0 3 0x14000 0x40000200 idle1 89030 191532 0 0 3 0x14000 0x200 bored softnet1 97771 236431 0 0 3 0x14000 0x200 bored softnet0 59531 23302 0 0 3 0x14000 0x200 bored systqmp 2199 485221 0 0 3 0x14000 0x200 bored systq 23823 49869 0 0 3 0x14000 0x200 tmoslp softclockmp 41307 260158 0 0 3 0x14000 0x40000200 tmoslp softclock 4681 370960 0 0 3 0x14000 0x40000200 idle0 1 239076 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 (0xffffffff8392e0b8) #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 94745 (syz-executor) thread 0xffff80003c3e2fb8 (32847) exclusive rwlock vmmaplk r = 0 (0xfffffb006d15bca0) #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 (0xffffffff8392e0b8) #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 11056 12019K 12034K 166960K 12147 0 pcb 17 12K 12K 166960K 17 0 rtable 247 7K 7K 166960K 382 0 pf 31 16K 16K 166960K 31 0 ifaddr 42 7K 7K 166960K 44 0 ifgroup 50 2K 2K 166960K 50 0 sysctl 4 1K 9K 166960K 11 0 counters 70 37K 37K 166960K 70 0 ioctlops 0 0K 4K 166960K 127 0 iov 0 0K 12K 166960K 23 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1288 81K 81K 166960K 1477 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 13K 166960K 29 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 43 0 dirhash 12 2K 2K 166960K 27 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 26 97K 117K 166960K 690 0 sigio 0 0K 0K 166960K 5 0 proc 61 115K 147K 166960K 576 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 102 0 in_multi 99 7K 7K 166960K 119 0 ether_multi 1 0K 0K 166960K 3 0 mrt 3 0K 0K 166960K 20 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 97 440K 440K 166960K 97 0 exec 0 0K 1K 166960K 420 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 263 176K 195K 166960K 8091 0 UVM aobj 105 7K 7K 166960K 109 0 pinsyscall 47 94K 110K 166960K 1773 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 0K 166960K 38 0 NDP 11 0K 2K 166960K 27 0 temp 50 9121K 9185K 166960K 4925 0 kqueue 15 22K 26K 166960K 144 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 120 105 0 101 2 1 1 2 0 8 0 rtentry 176 119 0 4 6 0 6 6 0 8 0 unpcb 144 686 0 671 9 4 5 9 0 8 4 syncache 336 11 0 11 1 0 1 1 0 8 1 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpcb 736 313 0 306 4 0 4 4 0 8 3 arp 136 19 0 0 1 0 1 1 0 8 0 ipq 40 5 0 0 1 0 1 1 0 8 0 ipqe 40 16 0 11 1 0 1 1 0 8 0 inpcb 328 768 0 756 7 0 7 7 0 8 5 ip6q 72 3 0 1 1 0 1 1 0 8 0 ip6af 40 3 0 2 1 0 1 1 0 8 0 nd6 152 31 0 3 2 0 2 2 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 499 0 24 30 0 30 30 0 8 0 art_table 40 500 0 24 5 0 5 5 0 8 0 art_node 32 119 0 14 1 0 1 1 0 8 0 sysvmsgpl 40 12 0 8 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 72 37 0 27 1 0 1 1 0 8 0 shmpl 112 106 0 4 3 0 3 3 0 8 0 dirhash 1024 27 0 10 3 0 3 3 0 8 0 dino2pl 256 2464 0 995 93 0 93 93 0 8 0 ffsino 296 2464 0 995 114 0 114 114 0 8 0 nchpl 144 3463 0 1765 64 0 64 64 0 8 0 vnodes 216 2545 0 0 142 0 142 142 0 8 0 namei 1024 11089 0 11089 1 0 1 1 0 8 1 percpumem 16 51 0 0 1 0 1 1 0 8 0 kstatmem 264 25 0 0 2 0 2 2 0 8 0 scxspl 216 11708 0 11708 9 2 7 7 1 8 7 plimitpl 152 149 0 125 2 0 2 2 0 8 1 sigapl 424 982 0 928 7 0 7 7 0 8 0 knotepl 120 545 0 0 17 0 17 17 0 8 0 kqueuepl 224 177 0 166 1 0 1 1 0 8 0 pipepl 344 197 0 170 3 0 3 3 0 8 0 fdescpl 528 966 0 928 3 0 3 3 0 8 0 filepl 160 5617 0 5393 18 3 15 18 0 8 5 lockfpl 104 208 0 204 1 0 1 1 0 8 0 lockfspl 48 58 0 55 1 0 1 1 0 8 0 sessionpl 144 55 0 39 1 0 1 1 0 8 0 pgrppl 48 66 0 42 1 0 1 1 0 8 0 ucredpl 104 1196 0 1177 1 0 1 1 0 8 0 zombiepl 144 934 0 928 1 0 1 1 0 8 0 processpl 1232 982 0 928 5 0 5 5 0 8 0 procpl 664 1939 0 1881 7 1 6 7 0 8 0 sosppl 176 3 0 3 2 1 1 1 0 8 1 sockpl 752 1565 0 1534 30 20 10 24 0 8 6 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k128 9344 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 129 0 0 17 0 17 17 0 8 0 mcl2k 2048 28 0 0 4 0 4 4 0 8 0 mextrefs 64 25 0 0 1 0 1 1 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 1276 0 0 80 0 80 80 0 8 0 bufpl 272 3522 0 102 228 0 228 228 0 8 0 anonpl 32 7564 0 0 61 0 61 61 0 247 0 amapchunkpl 152 26605 0 26022 43 5 38 38 0 158 12 amappl16 200 3260 0 3233 24 13 11 15 0 8 8 amappl15 192 33 0 33 1 1 0 1 0 8 0 amappl14 184 402 0 401 1 0 1 1 0 8 0 amappl13 176 114 0 104 1 0 1 1 0 8 0 amappl12 168 1194 0 1157 2 0 2 2 0 8 0 amappl11 160 6 0 6 1 1 0 1 0 8 0 amappl10 152 63 0 53 1 0 1 1 0 8 0 amappl9 144 276 0 276 1 1 0 1 0 8 0 amappl8 136 96 0 94 1 0 1 1 0 8 0 amappl7 128 142 0 130 1 0 1 1 0 8 0 amappl6 120 171 0 169 1 0 1 1 0 8 0 amappl5 112 97 0 88 1 0 1 1 0 8 0 amappl4 104 266 0 248 1 0 1 1 0 8 0 amappl3 96 5105 0 4967 5 1 4 4 0 8 0 amappl2 88 527 0 474 2 0 2 2 0 8 0 amappl1 80 12561 0 11975 16 0 16 16 0 8 2 amappl 88 7314 0 7115 5 0 5 5 0 92 0 uvmvnodes 80 113 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 72 108 0 4 2 0 2 2 0 8 0 uaddrrnd 24 966 0 928 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 966 0 928 1 0 1 1 0 8 0 vmmpekpl 168 9626 0 9596 2 0 2 2 0 8 0 vmmpepl 168 69172 0 67029 105 0 105 105 0 357 9 vmsppl 488 965 0 928 7 2 5 6 0 8 0 rwobjpl 80 21736 0 20652 29 1 28 28 0 8 0 pdppl 4096 1939 0 1856 111 28 83 93 0 8 0 pvpl 32 15936 0 0 129 0 129 129 0 265 0 pmappl 256 965 0 928 4 1 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 583 0 31 16 0 16 16 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(fffffb006d15bba0,fffffb006cfc7808,2,0,18814a02000,18814a02001) at amap_copy+0x6ac sys/uvm/uvm_amap.c:567 uvm_fault_check(ffff80003c3e9010,ffff80003c3e9048,ffff80003c3e9080,0) at uvm_fault_check+0x473 sys/uvm/uvm_fault.c:747 uvm_fault(fffffb006d15bba0,18814a02000,0,2) at uvm_fault+0x106 sys/uvm/uvm_fault.c:627 upageflttrap(ffff80003c3e91b0,18814a02818) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c3e91b0) 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 end of kernel end trace frame: 0x74f3a84adab0, count: -3