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(fffff9800f96b218,fffff980664098c8,2,0,ef0258d4000,ef0258d4001) at amap_copy+0x6ac sys/uvm/uvm_amap.c:567 uvm_fault_check(ffff80003c4211d0,ffff80003c421208,ffff80003c421240,0) at uvm_fault_check+0x473 sys/uvm/uvm_fault.c:747 uvm_fault(fffff9800f96b218,ef0258d4000,0,2) at uvm_fault+0x106 sys/uvm/uvm_fault.c:627 upageflttrap(ffff80003c421370,ef0258d48e8) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c421370) 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 0xfb644a1d1e079cb8 rsi 0xe2b9 __ALIGN_SIZE+0xd2b9 rbp 0xffff80003c420e70 rbx 0xfb644a1d1e077e01 rdx 0 rcx 0xffff80003c3caa88 rax 0xffffffff8393cff0 cpu_info_full_primary+0x1ff0 r8 0xef0258d4000 r9 0xef0258d4001 r10 0 r11 0x4f8d686e3121f059 r12 0xe2b9 __ALIGN_SIZE+0xd2b9 r13 0xffffffff83b03dd0 kmemstats+0x1880 r14 0xa30c333 __kernel_phys_end+0x670c333 r15 0xfb644a1d1e079cb8 rip 0xffffffff82d2bcd5 malloc+0x855 cs 0x8 rflags 0x10282 __ALIGN_SIZE+0xf282 rsp 0xffff80003c420db0 ss 0 malloc+0x855: movq 0x8(%rbx),%r14 ddb{0}> show proc PROC (syz-executor) tid=389065 pid=90167 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=0xffff80003c3cb780,0xffff80003c3ca2d0 process=0xffff80003c3ce6a0 user=0xffff80003c41c000, vmspace=0xfffff9800f96b218 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 37099 60838 42172 32767 2 0x10 0 syz-executor 74377 440399 20786 32767 2 0x10 0 syz-executor 90167 516211 87997 32767 7 0x10 0 syz-executor *90167 389065 87997 32767 7 0x10 0x4000000 syz-executor 94161 48882 38895 32767 2 0x10 0 syz-executor 94161 439488 38895 32767 3 0x10 0x4000080 kqsel syz-executor 94161 90136 38895 32767 3 0x10 0x4000080 fsleep syz-executor 99706 209462 70780 32767 2 0x11 0 syz-executor 99706 453951 70780 32767 3 0x11 0x4000080 ttyin syz-executor 99706 267289 70780 32767 2 0x11 0x4000000 syz-executor 33667 155427 37322 32767 3 0x1010 0x2000 suspend syz-executor 33667 407730 37322 32767 2 0x1010 0x4080000 syz-executor 27787 150443 21125 32767 2 0x10 0 syz-executor 27787 124583 21125 32767 3 0x10 0x4000080 piperd syz-executor 27787 134168 21125 32767 2 0x10 0x4000000 syz-executor 86263 66207 56831 32767 2 0x10 0 syz-executor 56831 487910 30938 32767 3 0x10 0x80 nanoslp syz-executor 38895 306490 2496 32767 3 0x10 0x80 nanoslp syz-executor 20786 433170 64544 32767 3 0x10 0x80 nanoslp syz-executor 42172 228920 94241 32767 2 0x10 0 syz-executor 70780 234526 4326 32767 3 0x10 0x80 nanoslp syz-executor 37322 24736 19115 32767 3 0x10 0x80 nanoslp syz-executor 87997 322580 96048 32767 3 0x10 0x80 nanoslp syz-executor 21125 402607 72486 32767 3 0x10 0x80 nanoslp syz-executor 19115 326074 12782 0 3 0x2 0x80 wait syz-executor 4326 260727 12782 0 3 0x2 0x80 wait syz-executor 64544 111750 12782 0 3 0x2 0x80 wait syz-executor 96048 263625 12782 0 3 0x2 0x80 wait syz-executor 2496 185209 12782 0 3 0x2 0x80 wait syz-executor 94241 171205 12782 0 3 0x2 0x80 wait syz-executor 72486 103212 12782 0 3 0x2 0x80 wait syz-executor 30938 330545 12782 0 3 0x2 0x80 wait syz-executor 12782 53697 54155 0 3 0x2 0x80 kqread syz-executor 54155 140903 83804 0 3 0x100002 0x88 sigsusp ksh 83804 430586 96122 0 3 0x10 0x88 kqread sshd-session 96122 190005 91212 0 3 0x12 0x80 kqread sshd-session 35207 129443 1 0 3 0x100003 0x80 ttyin getty 91212 245019 1 0 3 0 0x88 kqread sshd 22938 44486 98406 73 3 0x1100010 0x80 kqread syslogd 98406 496792 1 0 3 0x100002 0x80 sbwait syslogd 31516 268411 1 0 3 0x100000 0x80 kqread resolvd 87591 186776 68652 77 3 0x100012 0x80 kqread dhcpleased 80629 283165 68652 77 3 0x100012 0x80 kqread dhcpleased 68652 44625 1 0 3 0 0x80 kqread dhcpleased 41448 138471 0 0 3 0x14000 0x200 bored smr 77867 350834 0 0 2 0x14000 0x200 zerothread 58367 117665 0 0 3 0x14000 0x200 aiodoned aiodoned 89240 399891 0 0 3 0x14000 0x200 syncer update 3377 39094 0 0 3 0x14000 0x200 cleaner cleaner 29509 372891 0 0 3 0x14000 0x200 reaper reaper 46242 190406 0 0 3 0x14000 0x200 pgdaemon pagedaemon 20882 313200 0 0 3 0x14000 0x200 bored viomb 90337 442025 0 0 3 0x14000 0x40000200 acpi0 acpi0 17407 232692 0 0 3 0x14000 0x40000200 idle1 83454 421856 0 0 3 0x14000 0x200 bored softnet1 51102 156702 0 0 3 0x14000 0x200 bored softnet0 11798 115827 0 0 3 0x14000 0x200 bored systqmp 36519 482552 0 0 3 0x14000 0x200 bored systq 48526 390708 0 0 3 0x14000 0x200 tmoslp softclockmp 99209 27220 0 0 3 0x14000 0x40000200 tmoslp softclock 93659 374357 0 0 3 0x14000 0x40000200 idle0 1 209384 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 (0xffffffff839af2b8) #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 90167 (syz-executor) thread 0xffff80003c3caa88 (389065) exclusive rwlock vmmaplk r = 0 (0xfffff9800f96b318) #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 (0xffffffff839af2b8) #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 11049 12018K 12034K 166960K 12140 0 pcb 17 12K 12K 166960K 17 0 rtable 239 6K 7K 166960K 351 0 pf 31 16K 16K 166960K 31 0 ifaddr 42 7K 7K 166960K 44 0 ifgroup 50 2K 2K 166960K 50 0 sysctl 1 1K 9K 166960K 6 0 counters 70 37K 37K 166960K 70 0 ioctlops 0 0K 2K 166960K 32 0 iov 0 0K 4K 166960K 1 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1287 81K 81K 166960K 1357 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 4 0 VM map 2 1K 1K 166960K 2 0 sem 6 0K 0K 166960K 6 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 26 97K 125K 166960K 188 0 proc 58 99K 147K 166960K 496 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 5 0 in_multi 99 7K 7K 166960K 102 0 ether_multi 1 0K 0K 166960K 2 0 mrt 0 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 55 254K 254K 166960K 55 0 exec 0 0K 1K 166960K 361 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 238 159K 177K 166960K 3233 0 UVM aobj 5 2K 2K 166960K 5 0 pinsyscall 47 94K 110K 166960K 1268 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 3 0 NDP 11 0K 2K 166960K 27 0 temp 35 9114K 9120K 166960K 3740 0 kqueue 13 20K 27K 166960K 37 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 37 0 34 1 0 1 1 0 8 0 rtentry 176 112 0 1 6 0 6 6 0 8 0 unpcb 144 211 0 193 6 0 6 6 0 8 4 syncache 336 6 0 6 1 0 1 1 0 8 1 tcpcb 736 55 0 51 4 0 4 4 0 8 3 arp 136 18 0 0 1 0 1 1 0 8 0 ipq 40 1 0 0 1 0 1 1 0 8 0 ipqe 40 2 0 1 1 0 1 1 0 8 0 inpcb 328 134 0 125 4 0 4 4 0 8 2 nd6 152 25 0 0 1 0 1 1 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 256 468 0 0 30 0 30 30 0 8 0 art_table 40 469 0 0 5 0 5 5 0 8 0 art_node 32 112 0 11 1 0 1 1 0 8 0 semapl 72 4 0 0 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1632 0 172 92 0 92 92 0 8 0 ffsino 296 1632 0 172 113 0 113 113 0 8 0 nchpl 144 1887 0 201 63 0 63 63 0 8 0 vnodes 216 1713 0 0 96 0 96 96 0 8 0 namei 1024 5552 0 5552 2 0 2 2 0 8 2 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 6682 0 6682 4 2 2 3 1 8 2 plimitpl 152 45 0 20 2 0 2 2 0 8 1 sigapl 424 479 0 425 7 0 7 7 0 8 0 knotepl 120 310 0 0 10 0 10 10 0 8 0 kqueuepl 224 42 0 30 1 0 1 1 0 8 0 pipepl 344 125 0 97 3 0 3 3 0 8 0 fdescpl 528 463 0 425 4 0 4 4 0 8 0 filepl 160 1828 0 1610 15 0 15 15 0 8 5 lockfpl 104 15 0 13 1 0 1 1 0 8 0 lockfspl 48 8 0 6 1 0 1 1 0 8 0 sessionpl 144 27 0 9 1 0 1 1 0 8 0 pgrppl 48 35 0 9 1 0 1 1 0 8 0 ucredpl 104 152 0 133 1 0 1 1 0 8 0 zombiepl 144 426 0 425 1 0 1 1 0 8 0 processpl 1232 479 0 425 5 0 5 5 0 8 0 procpl 664 558 0 496 6 0 6 6 0 8 0 sockpl 752 382 0 352 18 0 18 18 0 8 14 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 107 0 0 14 0 14 14 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 3 0 0 1 0 1 1 0 8 0 mbufpl 256 179 0 0 12 0 12 12 0 8 0 bufpl 272 2476 0 102 159 0 159 159 0 8 0 anonpl 32 5613 0 0 46 0 46 46 0 247 0 amapchunkpl 152 9167 0 8647 26 0 26 26 0 158 4 amappl16 200 1982 0 1961 5 1 4 5 0 8 1 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 427 0 426 1 0 1 1 0 8 0 amappl13 176 117 0 107 1 0 1 1 0 8 0 amappl12 168 740 0 705 2 0 2 2 0 8 0 amappl11 160 3 0 3 1 1 0 1 0 8 0 amappl10 152 59 0 48 1 0 1 1 0 8 0 amappl9 144 268 0 268 1 1 0 1 0 8 0 amappl8 136 102 0 101 1 0 1 1 0 8 0 amappl7 128 144 0 133 1 0 1 1 0 8 0 amappl6 120 152 0 151 1 0 1 1 0 8 0 amappl5 112 167 0 160 1 0 1 1 0 8 0 amappl4 104 260 0 246 1 0 1 1 0 8 0 amappl3 96 1650 0 1529 5 1 4 4 0 8 0 amappl2 88 515 0 461 2 0 2 2 0 8 0 amappl1 80 10707 0 10132 16 0 16 16 0 8 1 amappl 88 2551 0 2375 5 0 5 5 0 92 0 uvmvnodes 80 97 0 0 2 0 2 2 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 4 0 0 1 0 1 1 0 8 0 uaddrrnd 24 463 0 425 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 463 0 425 1 0 1 1 0 8 0 vmmpekpl 168 5784 0 5752 2 0 2 2 0 8 0 vmmpepl 168 39570 0 37505 104 0 104 104 0 357 3 vmsppl 488 462 0 425 7 1 6 6 0 8 0 rwobjpl 80 14981 0 14057 24 0 24 24 0 8 0 pdppl 4096 933 0 850 107 20 87 97 0 8 4 pvpl 32 13523 0 0 110 0 110 110 0 265 0 pmappl 256 462 0 425 4 1 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 438 0 23 12 0 12 12 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(fffff9800f96b218,fffff980664098c8,2,0,ef0258d4000,ef0258d4001) at amap_copy+0x6ac sys/uvm/uvm_amap.c:567 uvm_fault_check(ffff80003c4211d0,ffff80003c421208,ffff80003c421240,0) at uvm_fault_check+0x473 sys/uvm/uvm_fault.c:747 uvm_fault(fffff9800f96b218,ef0258d4000,0,2) at uvm_fault+0x106 sys/uvm/uvm_fault.c:627 upageflttrap(ffff80003c421370,ef0258d48e8) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c421370) 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: 0x7957a2ac4a50, count: -3