login: kernel: double fault trap, code=0 Stopped at restore_saved+0x32: xorq 0x30(%rsp),%r11 ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace end trace frame: 0x0, count: -1 ddb{1}> show registers rdi 0xffffffff832c3000 end+0x2c3000 rsi 0xffff80002d6bc550 rbp 0 rbx 0 rdx 0 rcx 0xfffffd80650937c0 rax 0x1b r8 0x8 r9 0x1 r10 0x95f7d3398e5bce09 r11 0x9fd6966de5ba462b r12 0xffff80002d6bc550 r13 0xffff80002a25c000 r14 0 r15 0xffff80002a2422b0 rip 0xffffffff811061dc restore_saved+0x32 cs 0x8 rflags 0x10046 __ALIGN_SIZE+0xf046 rsp 0 ss 0x10 restore_saved+0x32: xorq 0x30(%rsp),%r11 ddb{1}> show proc PROC (syz-executor.2) tid=417843 pid=19186 tcnt=2 stat=onproc flags process=8000000 proc=0 runpri=81, usrpri=81, slppri=16, nice=20 wchan=0x0, wmesg=, ps_single=0x0 forw=0xffffffffffffffff, list=0xffff80002bca2a68,0xffff80002d6bd9e0 process=0xffff80002a28f9c8 user=0xffff80002a25c000, vmspace=0xfffffd806efa0c10 estcpu=31, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 10976 287037 14759 0 7 0x8000000 syz-executor.6 81805 329172 66121 0 2 0x8000000 syz-executor.0 81805 448873 66121 0 2 0xc000000 syz-executor.0 33354 392656 84544 0 2 0x8000000 syz-executor.4 33354 365469 84544 0 3 0xc000080 fsleep syz-executor.4 78203 272545 19488 0 2 0x8000000 syz-executor.5 78203 305852 19488 0 3 0xc000000 biowait syz-executor.5 9570 118413 73767 0 2 0x8000000 syz-executor.3 9570 136846 73767 0 3 0xc000080 fsleep syz-executor.3 79934 371368 58212 0 2 0x8000000 syz-executor.1 79934 317986 58212 0 3 0xc000080 fsleep syz-executor.1 60090 253303 89617 0 2 0x8000000 syz-executor.7 *19186 417843 12281 0 7 0x8000000 syz-executor.2 19186 185521 12281 0 3 0xc000080 fsleep syz-executor.2 73767 356075 15018 0 3 0x8000082 nanoslp syz-executor.3 89617 130336 15018 0 3 0x8000082 nanoslp syz-executor.7 15300 469989 1 0 3 0x18100083 ttyin getty 19488 389630 15018 0 2 0x8000002 syz-executor.5 19587 203109 0 0 3 0x14200 bored sosplice 58212 72558 15018 0 3 0x8000082 nanoslp syz-executor.1 12281 292318 15018 0 2 0x8000002 syz-executor.2 14759 262290 15018 0 3 0x8000082 nanoslp syz-executor.6 66121 116602 15018 0 3 0x8000082 nanoslp syz-executor.0 84544 270854 15018 0 3 0x8000082 nanoslp syz-executor.4 15018 77012 81150 0 3 0x1a000082 wait syz-fuzzer 15018 514481 81150 0 3 0x1e000082 nanoslp syz-fuzzer 15018 450233 81150 0 3 0x1e000082 thrsleep syz-fuzzer 15018 142352 81150 0 3 0x1e000082 wait syz-fuzzer 15018 461008 81150 0 3 0x1e000082 thrsleep syz-fuzzer 15018 346321 81150 0 3 0x1e000082 wait syz-fuzzer 15018 278433 81150 0 3 0x1e000082 wait syz-fuzzer 15018 55946 81150 0 3 0x1e000082 wait syz-fuzzer 15018 457798 81150 0 3 0x1e000082 wait syz-fuzzer 15018 247764 81150 0 3 0x1e000082 thrsleep syz-fuzzer 15018 325456 81150 0 3 0x1e000082 thrsleep syz-fuzzer 15018 365618 81150 0 3 0x1e000082 thrsleep syz-fuzzer 15018 131581 81150 0 3 0x1e000082 wait syz-fuzzer 15018 262812 81150 0 3 0x1e000082 wait syz-fuzzer 15018 337903 81150 0 3 0x1e000082 kqread syz-fuzzer 15018 487920 81150 0 3 0x1e000082 thrsleep syz-fuzzer 81150 317496 13779 0 3 0x810008a sigsusp ksh 13779 432814 27550 0 3 0x1800009a kqread sshd 27550 282975 1 0 3 0x18000088 kqread sshd 49796 345771 64918 73 3 0x19100090 kqread syslogd 64918 463948 1 0 3 0x18100082 sbwait syslogd 29740 500357 1 0 3 0x18100080 kqread resolvd 39139 217761 23433 77 3 0x18100092 kqread dhcpleased 22475 6814 23433 77 3 0x18100092 kqread dhcpleased 23433 14684 1 0 3 0x18000080 kqread dhcpleased 60722 405280 0 0 3 0x14200 bored smr 93271 166319 0 0 2 0x14200 zerothread 63865 97976 0 0 3 0x14200 aiodoned aiodoned 41665 197702 0 0 3 0x14200 syncer update 66966 474017 0 0 3 0x14200 cleaner cleaner 18327 192995 0 0 3 0x14200 reaper reaper 62430 451734 0 0 3 0x14200 pgdaemon pagedaemon 90792 212030 0 0 3 0x14200 bored viomb 34088 374915 0 0 3 0x40014200 acpi0 acpi0 25731 2992 0 0 3 0x40014200 idle1 34392 341231 0 0 3 0x14200 bored softnet3 59990 312260 0 0 3 0x14200 bored softnet2 46239 354545 0 0 3 0x14200 bored softnet1 90791 336977 0 0 3 0x14200 bored softnet0 19715 188741 0 0 3 0x14200 bored systqmp 73822 346622 0 0 3 0x14200 bored systq 19341 123873 0 0 3 0x14200 tmoslp softclockmp 7902 453172 0 0 3 0x40014200 tmoslp softclock 43384 20234 0 0 3 0x40014200 idle0 1 59246 0 0 3 0x8080082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive mutex &uvm.fpageqlock r = 0 (0xffffffff82e39d08) #0 witness_lock+0x446 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x446 sys/kern/subr_witness.c:1157 #1 mtx_enter_try+0x103 #2 mtx_enter+0x4e sys/kern/kern_lock.c:266 #3 uvm_pmr_getpages+0xeac sys/uvm/uvm_pmemrange.c:1206 #4 uvm_pglistalloc+0x24d sys/uvm/uvm_page.c:783 #5 uvm_km_kmemalloc_pla+0x26f sys/uvm/uvm_km.c:385 #6 uvm_uarea_alloc+0x4e sys/uvm/uvm_glue.c:275 #7 thread_fork+0xcd sys/kern/kern_fork.c:546 #8 sys___tfork+0x141 sys/kern/kern_fork.c:138 #9 syscall+0x854 mi_syscall sys/sys/syscall_mi.h:180 [inline] #9 syscall+0x854 sys/arch/amd64/amd64/trap.c:577 #10 Xsyscall+0x128 CPU 1: exclusive sched_lock &sched_lock r = 0 (0xffffffff82d7a1e0) #0 witness_lock+0x446 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x446 sys/kern/subr_witness.c:1157 #1 sleep_finish+0x145 sys/kern/kern_synch.c:401 #2 biowait+0x91 sys/kern/vfs_bio.c:1254 #3 bwrite+0x1fe sys/kern/vfs_bio.c:766 #4 ffs_update+0x27f sys/ufs/ffs/ffs_inode.c:111 #5 ufs_mkdir+0x314 sys/ufs/ufs/ufs_vnops.c:1148 #6 VOP_MKDIR+0xc3 sys/kern/vfs_vops.c:388 #7 domkdirat+0x125 sys/kern/vfs_syscalls.c:3077 #8 syscall+0x854 mi_syscall sys/sys/syscall_mi.h:180 [inline] #8 syscall+0x854 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 Process 10976 (syz-executor.6) thread 0xffff80002a2439c0 (287037) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82e81230) #0 witness_lock+0x446 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x446 sys/kern/subr_witness.c:1157 #1 syscall+0x83b mi_syscall sys/sys/syscall_mi.h:180 [inline] #1 syscall+0x83b sys/arch/amd64/amd64/trap.c:577 #2 Xsyscall+0x128 Process 78203 (syz-executor.5) thread 0xffff80002a2422b0 (305852) exclusive rrwlock inode r = 0 (0xfffffd806c5632c8) #0 witness_lock+0x446 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x446 sys/kern/subr_witness.c:1157 #1 rw_enter+0x32d sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x91 sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 ufs_ihashins+0x46 #5 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1230 #6 ffs_inode_alloc+0x1e4 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0xe6 sys/ufs/ufs/ufs_vnops.c:1117 #8 VOP_MKDIR+0xc3 sys/kern/vfs_vops.c:388 #9 domkdirat+0x125 sys/kern/vfs_syscalls.c:3077 #10 syscall+0x854 mi_syscall sys/sys/syscall_mi.h:180 [inline] #10 syscall+0x854 sys/arch/amd64/amd64/trap.c:577 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806e222d60) #0 witness_lock+0x446 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x446 sys/kern/subr_witness.c:1157 #1 rw_enter+0x32d sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x91 sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 vn_lock+0x85 sys/kern/vfs_vnops.c:564 #5 vfs_lookup+0xd3 sys/kern/vfs_lookup.c:418 #6 namei+0x56a sys/kern/vfs_lookup.c:250 #7 domkdirat+0x79 sys/kern/vfs_syscalls.c:3062 #8 syscall+0x854 mi_syscall sys/sys/syscall_mi.h:180 [inline] #8 syscall+0x854 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10184 6417K 6803K 166960K 12096 0 pcb 17 12K 12K 166960K 140 0 rtable 207 6K 8K 166960K 604 0 pf 32 9K 10K 166960K 74 0 ifaddr 42 14K 15K 166960K 80 0 ifgroup 55 2K 2K 166960K 104 0 sysctl 2 0K 1K 166960K 3 0 counters 66 36K 36K 166960K 94 0 ioctlops 0 0K 4K 166960K 1528 0 iov 0 0K 16K 166960K 47 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1382 87K 87K 166960K 1920 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 39 0 VM map 2 1K 1K 166960K 2 0 sem 12 1K 1K 166960K 110 0 dirhash 12 2K 2K 166960K 30 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 18 65K 81K 166960K 891 0 sigio 0 0K 0K 166960K 15 0 proc 58 79K 103K 166960K 695 0 subproc 104 6K 7K 166960K 169 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 131 0 in_multi 87 6K 7K 166960K 177 0 ether_multi 1 0K 0K 166960K 8 0 mrt 1 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 91 413K 413K 166960K 91 0 exec 0 0K 1K 166960K 525 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 290 77K 94K 166960K 10163 0 UVM aobj 61 5K 5K 166960K 64 0 pinsyscall 38 76K 100K 166960K 2202 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 49 0 NDP 12 0K 2K 166960K 52 0 temp 74 6820K 6896K 166960K 36224 0 kqueue 13 20K 30K 166960K 138 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 120 0 117 1 0 1 1 0 8 0 rtentry 112 190 0 97 4 0 4 4 0 8 0 unpcb 144 656 0 643 3 2 1 2 0 8 0 syncache 336 6 0 6 2 2 0 1 0 8 0 tcpcb 808 220 0 215 6 5 1 2 0 8 0 arp 120 31 0 12 1 0 1 1 0 8 0 inpcb 384 874 0 865 7 5 2 3 0 8 0 nd6 136 52 0 27 2 0 2 2 0 8 0 pkpcb 40 7 0 7 3 2 1 1 0 8 1 kcovpl 48 13 0 5 1 0 1 1 0 8 0 ppxss 1168 5 0 5 3 2 1 1 0 8 1 pffrag 232 7 0 6 1 0 1 1 0 482 0 pffrnode 88 4 0 3 1 0 1 1 0 8 0 pffrent 40 11 0 10 1 0 1 1 0 8 0 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 87 0 55 1 0 1 1 0 8 0 pfstkey 128 87 0 55 2 0 2 2 0 8 0 pfstate 376 87 0 55 5 1 4 5 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 705 0 318 29 3 26 29 0 8 1 art_table 32 706 0 318 4 0 4 4 0 8 0 art_node 16 186 0 102 1 0 1 1 0 8 0 sysvmsgpl 40 14 0 7 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 106 0 96 1 0 1 1 0 8 0 shmpl 112 61 0 3 2 0 2 2 0 8 0 dirhash 1024 29 0 12 3 0 3 3 0 8 0 dino2pl 256 2848 0 1328 96 0 96 96 0 8 0 ffsino 272 2848 0 1328 102 0 102 102 0 8 0 nchpl 144 4267 0 2529 67 0 67 67 0 8 0 uvmvnodes 80 3301 0 0 68 0 68 68 0 8 0 vnodes 216 3301 0 0 184 0 184 184 0 8 0 namei 1024 14714 0 14713 3 2 1 2 0 8 0 percpumem 16 61 0 14 1 0 1 1 0 8 0 vcpupl 3904 4 0 1 1 0 1 1 0 8 0 vmpool 696 9 0 6 1 0 1 1 0 8 0 kstatmem 264 52 0 28 2 0 2 2 0 8 0 scsiplug 72 2 0 2 1 1 0 1 0 8 0 scxspl 216 22509 0 22508 11 10 1 8 1 8 0 plimitpl 152 172 0 157 1 0 1 1 0 8 0 sigapl 424 1200 0 1152 6 0 6 6 0 8 0 futexpl 64 13256 0 13252 1 0 1 1 0 8 0 knotepl 120 821 0 0 25 0 25 25 0 8 0 kqueuepl 216 259 0 250 1 0 1 1 0 8 0 pipepl 320 254 0 226 3 0 3 3 0 8 0 fdescpl 496 1180 0 1151 6 2 4 5 0 8 0 filepl 152 7012 0 6776 12 1 11 12 0 8 0 lockfpl 104 253 0 251 1 0 1 1 0 8 0 lockfspl 48 109 0 107 1 0 1 1 0 8 0 sessionpl 144 29 0 13 1 0 1 1 0 8 0 pgrppl 48 43 0 27 1 0 1 1 0 8 0 ucredpl 104 1056 0 1046 1 0 1 1 0 8 0 zombiepl 144 1152 0 1152 1 0 1 1 0 8 1 processpl 1136 1200 0 1152 4 0 4 4 0 8 0 procpl 656 2100 0 2031 7 0 7 7 0 8 0 srpgc 96 7 0 7 3 3 0 1 0 8 0 sosppl 168 12 0 12 7 7 0 1 0 8 0 sockpl 664 1668 0 1644 10 6 4 5 0 8 2 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 325 0 0 41 0 41 41 0 8 0 mtagpl 96 15 0 0 1 0 1 1 0 8 0 mbufpl 256 380 0 0 22 0 22 22 0 8 0 bufpl 280 7008 0 753 447 0 447 447 0 8 0 anonpl 24 304875 0 298669 94 31 63 68 0 186 10 amapchunkpl 152 33287 0 32573 51 16 35 40 0 158 5 amappl16 200 8305 0 8171 49 31 18 20 0 8 10 amappl15 192 38 0 37 2 1 1 1 0 8 0 amappl14 184 198 0 186 2 1 1 2 0 8 0 amappl13 176 84 0 84 1 1 0 1 0 8 0 amappl12 168 1920 0 1889 2 0 2 2 0 8 0 amappl11 160 56 0 46 1 0 1 1 0 8 0 amappl10 152 50 0 40 1 0 1 1 0 8 0 amappl9 144 163 0 163 3 3 0 1 0 8 0 amappl8 136 157 0 120 2 0 2 2 0 8 0 amappl7 128 74 0 61 1 0 1 1 0 8 0 amappl6 120 424 0 408 2 1 1 2 0 8 0 amappl5 112 188 0 174 1 0 1 1 0 8 0 amappl4 104 587 0 554 2 0 2 2 0 8 0 amappl3 96 6918 0 6832 4 1 3 3 0 8 0 amappl2 88 1618 0 1545 4 2 2 4 0 8 0 amappl1 80 12472 0 11975 22 10 12 22 0 8 0 amappl 88 9516 0 9313 6 0 6 6 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 63 0 3 2 0 2 2 0 8 0 uaddrrnd 24 1189 0 1157 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1189 0 1157 1 0 1 1 0 8 0 vmmpekpl 168 12860 0 12802 3 0 3 3 0 8 0 vmmpepl 168 94893 0 92946 144 50 94 118 0 357 8 vmsppl 440 1188 0 1157 4 0 4 4 0 8 0 rwobjpl 56 33954 0 29502 72 6 66 66 0 8 1 pdppl 4096 2385 0 2317 136 67 69 73 0 8 1 pvpl 32 49234 0 0 399 1 398 398 0 265 0 pmappl 248 1188 0 1157 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 451 0 83 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff82c8cff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xf sys/dev/kcov.c:154 wakeup_n(ffffffff82e39b74,ffffffff) at wakeup_n+0x58 sys/kern/kern_synch.c:542 uvm_pmr_getpages(6,0,0,1,0,6,babb56adad8fe104,ffffffffffffffff) at uvm_pmr_getpages+0xef2 sys/uvm/uvm_pmemrange.c:1208 uvm_pglistalloc(6000,0,ffffffffffffffff,0,0,ffff8000373c92a0,2d61737335871c3c,ffffffff82e843b8) at uvm_pglistalloc+0x24d sys/uvm/uvm_page.c:783 uvm_km_kmemalloc_pla(ffffffff82e79c60,ffffffff82e843b8,6000,0,8,0,601a485553180825,a00,47,8e2311c61f0) at uvm_km_kmemalloc_pla+0x26f sys/uvm/uvm_km.c:385 uvm_uarea_alloc() at uvm_uarea_alloc+0x4e sys/uvm/uvm_glue.c:275 thread_fork(ffff80002a2439c0,8e2311c61f0,8e25e0a6e00,8e25e0a6e30,ffff8000373c94d0) at thread_fork+0xcd sys/kern/kern_fork.c:546 sys___tfork(ffff80002a2439c0,ffff8000373c9580,ffff8000373c94d0) at sys___tfork+0x141 sys/kern/kern_fork.c:138 syscall(ffff8000373c9580) at syscall+0x854 mi_syscall sys/sys/syscall_mi.h:180 [inline] syscall(ffff8000373c9580) at syscall+0x854 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x79abc430f5a0, count: -13 ddb{0}> machine ddbcpu 1 Stopped at restore_saved+0x32: xorq 0x30(%rsp),%r11 ddb{1}> trace end trace frame: 0x0, count: -1