kernel: protection fault trap, code=0 Stopped at malloc+0x83d: movq 0x8(%rbx),%r15 ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace malloc(10,7f,1) at malloc+0x83d sys/kern/kern_malloc.c:290 dofilereadv(ffff8000ffffb960,a,ffff80002a39c538,0,ffff80002a39c5f0) at dofilereadv+0x1d2 sys_read(ffff8000ffffb960,ffff80002a39c6a0,ffff80002a39c5f0) at sys_read+0xa2 sys/kern/sys_generic.c:172 syscall(ffff80002a39c6a0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a39c6a0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7409a9b09f80, count: -5 ddb{0}> show registers rdi 0x5e31487838901b8 rsi 0 rbp 0xffff80002a39c490 rbx 0x5e31487838901b8 rdx 0 rcx 0xffff8000ffffb960 rax 0xffffffff83797ff0 cpu_info_full_primary+0x1ff0 r8 0 r9 0 r10 0x7742ed63db21fcaa r11 0xa238f1a678963e13 r12 0x5e31487838901b8 r13 0xffffffff839ba6a0 bucket+0x120 r14 0x5e31487838901b8 r15 0 rip 0xffffffff82a03e4d malloc+0x83d cs 0x8 rflags 0x10206 __ALIGN_SIZE+0xf206 rsp 0xffff80002a39c3c0 ss 0x10 malloc+0x83d: movq 0x8(%rbx),%r15 ddb{0}> show proc PROC (syslogd) tid=357510 pid=96654 tcnt=1 stat=onproc flags process=1100010 proc=0 runpri=50, usrpri=51, slppri=24, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffffb6d8,0xffff8000ffffa020 process=0xffff80002a371dc0 user=0xffff80002a397000, vmspace=0xfffffd806eb84ab8 estcpu=1, cpticks=1, pctcpu=0.0, user=0, sys=5, intr=1 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 74384 28490 41037 0 2 0 syz-executor 74384 236851 41037 0 3 0x4000080 fsleep syz-executor 74384 200670 41037 0 3 0x4000080 fsleep syz-executor 23053 148124 84797 0 2 0 syz-executor 23053 183443 84797 0 3 0x4000080 fsleep syz-executor 54255 190480 45189 0 2 0 syz-executor 54255 304624 45189 0 3 0x4000080 fsleep syz-executor 21904 342082 17673 0 2 0 syz-executor 21904 243014 17673 0 2 0x4000000 syz-executor 21904 94795 17673 0 3 0x4000080 fsleep syz-executor 18638 146138 61194 0 3 0x80 nanoslp syz-executor 18638 22258 61194 0 3 0x4000080 msgwait syz-executor 18638 279598 61194 0 3 0x4000080 fsleep syz-executor 58444 206104 85753 0 3 0x80 nanoslp syz-executor 58444 519939 85753 0 3 0x4000080 msgwait syz-executor 58444 155655 85753 0 3 0x4000080 fsleep syz-executor 70343 152008 64286 0 7 0x100002 arp 64286 133356 38564 0 3 0x10008a sigsusp sh 84797 447329 97856 0 3 0x82 nanoslp syz-executor 54691 148290 97856 0 3 0x82 nanoslp syz-executor 38564 501383 97856 0 3 0x82 wait syz-executor 17673 68309 97856 0 3 0x82 nanoslp syz-executor 41037 279708 97856 0 3 0x82 nanoslp syz-executor 45189 61175 97856 0 3 0x82 nanoslp syz-executor 61194 185256 97856 0 3 0x82 nanoslp syz-executor 85753 482122 97856 0 3 0x82 nanoslp syz-executor 97856 327897 96366 0 3 0x82 kqread syz-executor 96366 237104 98344 0 3 0x10008a sigsusp ksh 98344 165871 16489 0 3 0x98 kqread sshd-session 16489 222993 7964 0 3 0x92 kqread sshd-session 27747 35823 1 0 3 0x100083 ttyin getty 7964 25701 1 0 3 0x88 kqread sshd 79885 51591 96669 74 3 0x1100092 bpf pflogd 96669 386541 1 0 3 0x80 sbwait pflogd *96654 357510 37981 73 7 0x1100010 syslogd 37981 439302 1 0 3 0x100082 sbwait syslogd 79853 31122 1 0 3 0x100080 kqread resolvd 14565 268162 11051 77 3 0x100012 netlock dhcpleased 21752 357400 11051 77 3 0x100092 kqread dhcpleased 11051 235360 1 0 3 0x80 kqread dhcpleased 10070 363833 0 0 3 0x14200 bored smr 81343 268714 0 0 2 0x14200 zerothread 16660 7357 0 0 3 0x14200 aiodoned aiodoned 33343 402664 0 0 3 0x14200 syncer update 22566 223662 0 0 3 0x14200 cleaner cleaner 55333 88123 0 0 3 0x14200 reaper reaper 70000 51355 0 0 3 0x14200 pgdaemon pagedaemon 96465 465387 0 0 3 0x14200 bored viomb 63373 516003 0 0 3 0x40014200 acpi0 acpi0 94744 403357 0 0 3 0x40014200 idle1 12955 422644 0 0 3 0x14200 bored softnet3 64911 154539 0 0 3 0x14200 bored softnet2 79808 190117 0 0 3 0x14200 bored softnet1 76717 207655 0 0 3 0x14200 bored softnet0 83266 79392 0 0 3 0x14200 bored systqmp 88125 188289 0 0 3 0x14200 bored systq 4969 270367 0 0 3 0x14200 tmoslp softclockmp 83578 251277 0 0 3 0x40014200 tmoslp softclock 53987 67544 0 0 3 0x40014200 idle0 1 452313 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex /syzkaller/managers/multicore/kernel/sys/kern/kern_malloc.c:96 r = 0 (0xffffffff8385d888) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 mtx_enter_try+0x178 #2 mtx_enter+0x60 sys/kern/kern_lock.c:239 #3 malloc+0x2f9 sys/kern/kern_malloc.c:199 #4 dofilereadv+0x1d2 #5 sys_read+0xa2 sys/kern/sys_generic.c:172 #6 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 Process 21904 (syz-executor) thread 0xffff8000330be530 (243014) exclusive rwlock art r = 0 (0xffff80000006c6a0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 rtable_mpath_reprio+0x135 sys/net/rtable.c:809 #3 rt_if_linkstate_change+0x23b #4 rtable_walk_helper+0x73 sys/net/rtable.c:738 #5 art_table_walk+0x350 art_walk_apply sys/net/art.c:675 [inline] #5 art_table_walk+0x350 sys/net/art.c:647 #6 art_table_walk+0x3e6 sys/net/art.c:656 #7 art_table_walk+0x3e6 sys/net/art.c:656 #8 art_table_walk+0x3e6 sys/net/art.c:656 #9 art_table_walk+0x3e6 sys/net/art.c:656 #10 art_table_walk+0x3e6 sys/net/art.c:656 #11 art_table_walk+0x3e6 sys/net/art.c:656 #12 art_table_walk+0x3e6 sys/net/art.c:656 #13 art_table_walk+0x3e6 sys/net/art.c:656 #14 art_table_walk+0x3e6 sys/net/art.c:656 #15 art_table_walk+0x3e6 sys/net/art.c:656 #16 art_table_walk+0x3e6 sys/net/art.c:656 #17 art_table_walk+0x3e6 sys/net/art.c:656 #18 art_table_walk+0x3e6 sys/net/art.c:656 exclusive rwlock netlock r = 0 (0xffffffff838203f8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 ifioctl+0x23b1 sys/net/if.c:2297 #3 sys_ioctl+0x5c3 #4 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #5 Xsyscall+0x128 Process 14565 (dhcpleased) thread 0xffff8000ffffaa30 (268162) exclusive rwlock sysctllk r = 0 (0xffffffff838599e8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 sysctl_vslock+0x45 sys/kern/kern_sysctl.c:185 #3 net_sysctl+0x5a1 sys/kern/uipc_domain.c:253 #4 sys_sysctl+0x425 #5 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #6 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10194 11031K 11425K 166960K 11362 0 pcb 17 12K 12K 166960K 36 0 rtable 218 7K 7K 166960K 423 0 pf 37 18K 18K 166960K 49 0 ifaddr 41 6K 7K 166960K 44 0 ifgroup 59 2K 2K 166960K 59 0 sysctl 2 1K 1K 166960K 2 0 counters 66 36K 36K 166960K 66 0 ioctlops 0 0K 4K 166960K 1485 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1374 86K 86K 166960K 1500 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 2 0K 0K 166960K 3 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 19 69K 89K 166960K 200 0 sigio 0 0K 0K 166960K 1 0 proc 72 91K 115K 166960K 530 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 3 0 in_multi 85 6K 6K 166960K 91 0 ether_multi 1 0K 0K 166960K 1 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 379 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 239 73K 74K 166960K 3507 0 UVM aobj 5 2K 2K 166960K 5 0 pinsyscall 45 90K 104K 166960K 1314 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 5 0 NDP 13 0K 1K 166960K 27 0 temp 41 8631K 8695K 166960K 5545 0 kqueue 13 20K 30K 166960K 33 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 41 0 36 1 0 1 1 0 8 0 rtentry 112 105 0 6 3 0 3 3 0 8 0 unpcb 144 68 0 51 2 0 2 2 0 8 1 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 808 28 0 24 2 1 1 2 0 8 0 arp 120 17 0 0 1 0 1 1 0 8 0 inpcb 376 168 0 158 5 3 2 5 0 8 1 nd6 136 22 0 2 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 pffrag 232 1 0 1 1 0 1 1 0 482 1 pffrnode 88 1 0 1 1 0 1 1 0 8 1 pffrent 40 2 0 2 1 0 1 1 0 8 1 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 24 0 0 1 0 1 1 0 8 0 pfstkey 128 24 0 0 1 0 1 1 0 8 0 pfstate 376 24 0 0 3 0 3 3 0 8 0 pfrule 1344 21 0 15 2 0 2 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 447 0 16 28 0 28 28 0 8 0 art_table 32 449 0 16 4 0 4 4 0 8 0 art_node 16 104 0 13 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 0 1 0 1 1 0 8 0 semapl 112 1 0 1 1 1 0 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1743 0 230 95 0 95 95 0 8 0 ffsino 280 1743 0 230 109 0 109 109 0 8 0 nchpl 144 2023 0 335 63 0 63 63 0 8 0 uvmvnodes 80 1889 0 0 39 0 39 39 0 8 0 vnodes 216 1889 0 0 105 0 105 105 0 8 0 namei 1024 6418 0 6418 2 1 1 1 0 8 1 percpumem 16 47 0 0 1 0 1 1 0 8 0 kstatmem 264 26 0 0 2 0 2 2 0 8 0 scxspl 216 6245 0 6245 3 2 1 2 1 8 1 plimitpl 152 38 0 21 1 0 1 1 0 8 0 sigapl 424 511 0 460 7 0 7 7 0 8 0 futexpl 64 1228 0 1221 1 0 1 1 0 8 0 knotepl 120 315 0 0 10 0 10 10 0 8 0 kqueuepl 216 39 0 30 1 0 1 1 0 8 0 pipepl 328 114 0 87 3 0 3 3 0 8 0 fdescpl 504 493 0 460 5 0 5 5 0 8 0 filepl 152 2222 0 2002 13 1 12 13 0 8 2 lockfpl 104 35 0 33 1 0 1 1 0 8 0 lockfspl 48 16 0 14 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 31 0 14 1 0 1 1 0 8 0 ucredpl 104 316 0 302 1 0 1 1 0 8 0 zombiepl 144 495 0 494 1 0 1 1 0 8 0 processpl 1168 511 0 460 5 0 5 5 0 8 0 procpl 648 652 0 591 6 0 6 6 0 8 0 srpgc 96 1 0 0 1 0 1 1 0 8 0 sockpl 688 278 0 246 7 2 5 7 0 8 2 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 125 0 0 16 0 16 16 0 8 0 mcl2k 2048 21 0 0 3 0 3 3 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 170 0 0 11 0 11 11 0 8 0 bufpl 280 2439 0 126 166 0 166 166 0 8 0 anonpl 24 102548 0 99064 34 1 33 33 0 184 9 amapchunkpl 152 10739 0 10206 27 1 26 26 0 158 2 amappl16 200 1783 0 1762 5 3 2 5 0 8 0 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 121 0 108 1 0 1 1 0 8 0 amappl13 176 5 0 5 1 1 0 1 0 8 0 amappl12 168 1152 0 1118 4 1 3 3 0 8 0 amappl11 160 49 0 35 1 0 1 1 0 8 0 amappl10 152 11 0 11 1 1 0 1 0 8 0 amappl9 144 246 0 246 1 1 0 1 0 8 0 amappl8 136 26 0 24 1 0 1 1 0 8 0 amappl7 128 113 0 100 1 0 1 1 0 8 0 amappl6 120 203 0 199 1 0 1 1 0 8 0 amappl5 112 121 0 111 1 0 1 1 0 8 0 amappl4 104 325 0 305 1 0 1 1 0 8 0 amappl3 96 1750 0 1626 5 1 4 4 0 8 0 amappl2 88 671 0 606 2 0 2 2 0 8 0 amappl1 80 8148 0 7547 15 0 15 15 0 8 0 amappl 88 3120 0 2940 5 0 5 5 0 92 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 24 493 0 460 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 493 0 460 1 0 1 1 0 8 0 vmmpekpl 168 5864 0 5831 2 0 2 2 0 8 0 vmmpepl 168 36932 0 35000 90 3 87 90 0 357 2 vmsppl 456 492 0 460 5 0 5 5 0 8 0 rwobjpl 64 15232 0 12362 49 2 47 47 0 8 0 pdppl 4096 994 0 920 102 28 74 86 0 8 0 pvpl 32 11209 0 0 91 0 91 91 0 265 0 pmappl 248 492 0 460 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 281 0 33 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace malloc(10,7f,1) at malloc+0x83d sys/kern/kern_malloc.c:290 dofilereadv(ffff8000ffffb960,a,ffff80002a39c538,0,ffff80002a39c5f0) at dofilereadv+0x1d2 sys_read(ffff8000ffffb960,ffff80002a39c6a0,ffff80002a39c5f0) at sys_read+0xa2 sys/kern/sys_generic.c:172 syscall(ffff80002a39c6a0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a39c6a0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7409a9b09f80, count: -5 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800029aabff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 mtx_enter(ffffffff8385d878) at mtx_enter+0xa0 sys/kern/kern_lock.c:250 malloc(10,7f,1) at malloc+0x2f9 sys/kern/kern_malloc.c:199 dofilereadv(ffff8000330be020,3,ffff800038cdaa38,0,ffff800038cdaaf0) at dofilereadv+0x1d2 sys_read(ffff8000330be020,ffff800038cdaba0,ffff800038cdaaf0) at sys_read+0xa2 sys/kern/sys_generic.c:172 syscall(ffff800038cdaba0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800038cdaba0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f480bf45390, count: -9