*cpu1: uvm_fault(0xfffff7000e57b208, 0x98, 0, 1) -> e ddb{0}> show kasan No such command ddb{0}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x75e571c55e20, count: -1 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff800037fafc10 rbx 0 rdx 0 rcx 0xffff800032f9a7e8 rax 0x3c r8 0xffff800037fafb40 r9 0 r10 0xa83e35ec7d6aa830 r11 0x9a1ed14869600f6b r12 0 r13 0 r14 0xffff800032f9a7e8 r15 0 rip 0xffffffff818193ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff800037fafb90 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{0}> show proc PROC (syz-executor) tid=413765 pid=47760 tcnt=4 stat=onproc flags process=0 proc=0 runpri=86, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800032f9a020,0xffff800032f9ba20 process=0xffff80003c3d4020 user=0xffff800037faa000, vmspace=0xfffff7000e57b7c0 estcpu=36, cpticks=3, pctcpu=0.0, user=2, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 29182 119959 83503 0 2 0 0 syz-executor 95116 107873 39349 0 2 0 0 syz-executor 34535 251106 4744 0 2 0 0 syz-executor 34535 500004 4744 0 7 0 0x4000000 syz-executor *47760 413765 91168 0 7 0 0 syz-executor 47760 118408 91168 0 3 0 0x4000080 fsleep syz-executor 47760 439914 91168 0 3 0 0x4000080 fsleep syz-executor 47760 432381 91168 0 3 0 0x4000080 fsleep syz-executor 63659 415162 77819 -1 2 0x10 0 syz-executor 63659 342413 77819 -1 3 0x10 0x4000080 fsleep syz-executor 27618 310012 64941 0 2 0x1000000 0 syz-executor 27618 225604 64941 0 3 0x1000000 0x4000080 fsleep syz-executor 91168 503461 70551 0 3 0x2 0x80 nanoslp syz-executor 32122 281883 70551 0 3 0x2 0 biowait syz-executor 617 58266 70551 0 3 0x2 0x80 nanoslp syz-executor 77819 240446 70551 0 2 0x2 0 syz-executor 39349 203675 70551 0 3 0x2 0x80 nanoslp syz-executor 4744 306554 70551 0 3 0x2 0x80 nanoslp syz-executor 83503 381565 70551 0 2 0x2 0 syz-executor 64941 260925 70551 0 3 0x2 0x80 nanoslp syz-executor 70551 175447 28143 0 3 0x2 0x80 kqread syz-executor 28143 43967 36682 0 3 0x100002 0x88 sigsusp ksh 36682 9455 11786 0 3 0x10 0x88 kqread sshd-session 11786 327228 14981 0 3 0x12 0x80 kqread sshd-session 54968 226201 1 0 3 0x100003 0x80 ttyin getty 14981 469210 1 0 3 0 0x88 kqread sshd 65507 150342 10916 74 3 0x1100012 0x80 bpf pflogd 10916 43916 1 0 3 0 0x80 sbwait pflogd 54127 16182 65215 73 3 0x1100010 0x80 kqread syslogd 65215 18173 1 0 3 0x100002 0x80 sbwait syslogd 48519 88511 1 0 3 0x100000 0x80 kqread resolvd 43826 159751 8167 77 3 0x100012 0x80 kqread dhcpleased 28248 268945 8167 77 3 0x100012 0x80 kqread dhcpleased 8167 429492 1 0 3 0 0x80 kqread dhcpleased 94672 352593 0 0 3 0x14000 0x200 bored smr 37569 148454 0 0 2 0x14000 0x200 zerothread 18313 278133 0 0 3 0x14000 0x200 aiodoned aiodoned 57393 427775 0 0 3 0x14000 0x200 syncer update 75379 386118 0 0 3 0x14000 0x200 cleaner cleaner 97941 174881 0 0 3 0x14000 0x200 reaper reaper 62818 377988 0 0 3 0x14000 0x200 pgdaemon pagedaemon 90712 355290 0 0 3 0x14000 0x200 bored viomb 20977 427246 0 0 3 0x14000 0x40000200 acpi0 acpi0 22175 22328 0 0 3 0x14000 0x40000200 idle1 34045 22373 0 0 3 0x14000 0x200 bored softnet1 51545 28020 0 0 3 0x14000 0x200 bored softnet0 10894 392944 0 0 3 0x14000 0x200 smrbar systqmp 81166 32691 0 0 3 0x14000 0x200 bored systq 33742 3933 0 0 3 0x14000 0x200 tmoslp softclockmp 63051 86745 0 0 3 0x14000 0x40000200 tmoslp softclock 81731 519896 0 0 3 0x14000 0x40000200 idle0 1 287493 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{0}> show all locks Process 34535 (syz-executor) thread 0xffff800032f9bca8 (500004) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83aef6c0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] #1 syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 #2 Xsyscall+0x128 Process 32122 (syz-executor) thread 0xffff800045fef4d8 (281883) exclusive rrwlock inode r = 0 (0xfffff7006cafaea8) #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_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576 #5 vget+0x2a2 sys/kern/vfs_subr.c:692 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203 #8 ufs_lookup+0x1a36 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x963 sys/kern/vfs_lookup.c:580 #11 namei+0x7c5 sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1807 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffff70072aa7e98) #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_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576 #5 vfs_lookup+0x12b sys/kern/vfs_lookup.c:431 #6 namei+0x7c5 sys/kern/vfs_lookup.c:250 #7 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1807 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #9 Xsyscall+0x128 Process 10894 (systqmp) thread 0xffff800045ffe298 (392944) shared rwlock systqmp r = 0 (0xffffffff839dd068) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11057 12150K 12150K 166960K 12152 0 pcb 18 12K 12K 166960K 22 0 rtable 237 6K 7K 166960K 352 0 pf 34 17K 18K 166960K 48 0 ifaddr 43 7K 7K 166960K 45 0 ifgroup 55 2K 2K 166960K 55 0 sysctl 1 1K 9K 166960K 5 0 counters 70 37K 37K 166960K 70 0 ioctlops 0 0K 4K 166960K 1489 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1356 85K 85K 166960K 1435 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 1K 166960K 2 0 VM map 2 1K 1K 166960K 2 0 sem 2 0K 0K 166960K 3 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 17 61K 89K 166960K 160 0 proc 72 131K 164K 166960K 563 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 2 0 in_multi 99 7K 7K 166960K 100 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 31 148K 148K 166960K 31 0 exec 0 0K 1K 166960K 425 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 215 166K 176K 166960K 3387 0 UVM aobj 3 2K 2K 166960K 3 0 pinsyscall 42 84K 104K 166960K 1316 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 28 2K 2K 166960K 28 0 temp 34 9114K 9120K 166960K 3986 0 kqueue 15 22K 25K 166960K 31 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 34 0 31 1 0 1 1 0 8 0 rtentry 176 111 0 1 5 0 5 5 0 8 0 unpcb 144 52 0 30 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 10 0 5 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 74 0 64 1 0 1 1 0 8 0 nd6 152 24 0 0 1 0 1 1 0 8 0 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 pfstlim 224 1 0 1 1 0 1 1 0 8 1 pfstitem 24 18 0 0 1 0 1 1 0 8 0 pfstkey 128 18 0 0 1 0 1 1 0 8 0 pfstate 448 18 0 0 2 0 2 2 0 8 0 pfrule 1360 22 0 17 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 453 0 0 29 0 29 29 0 8 0 art_table 40 454 0 0 5 0 5 5 0 8 0 art_node 32 111 0 10 1 0 1 1 0 8 0 semapl 72 1 0 1 1 0 1 1 0 8 1 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1600 0 131 93 0 93 93 0 8 0 ffsino 296 1600 0 131 114 0 114 114 0 8 0 nchpl 144 1835 0 136 64 0 64 64 0 8 0 vnodes 216 1761 0 0 98 0 98 98 0 8 0 namei 1024 5688 0 5688 1 0 1 1 0 8 1 percpumem 16 51 0 0 1 0 1 1 0 8 0 kstatmem 264 27 0 0 2 0 2 2 0 8 0 scxspl 216 6190 0 6189 3 1 2 2 1 8 1 plimitpl 152 33 0 16 1 0 1 1 0 8 0 sigapl 424 477 0 430 7 0 7 7 0 8 1 knotepl 120 54 0 0 2 0 2 2 0 8 0 kqueuepl 224 25 0 14 1 0 1 1 0 8 0 pipepl 344 126 0 99 3 0 3 3 0 8 0 fdescpl 528 461 0 430 3 0 3 3 0 8 0 filepl 160 1709 0 1487 13 0 13 13 0 8 3 lockfpl 104 9 0 4 1 0 1 1 0 8 0 lockfspl 48 7 0 2 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 33 0 16 1 0 1 1 0 8 0 ucredpl 104 99 0 85 1 0 1 1 0 8 0 zombiepl 144 431 0 430 1 0 1 1 0 8 0 processpl 1232 477 0 430 5 0 5 5 0 8 0 procpl 664 519 0 466 5 0 5 5 0 8 0 sockpl 752 160 0 125 4 0 4 4 0 8 0 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 112 0 0 14 0 14 14 0 8 0 mcl2k 2048 20 0 0 3 0 3 3 0 8 0 mextrefs 64 21 0 0 1 0 1 1 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 169 0 0 11 0 11 11 0 8 0 bufpl 272 2320 0 105 148 0 148 148 0 8 0 anonpl 32 3834 0 0 31 0 31 31 0 247 0 amapchunkpl 152 9327 0 8898 27 0 27 27 0 158 7 amappl16 200 1845 0 1822 5 0 5 5 0 8 3 amappl15 192 58 0 58 1 0 1 1 0 8 1 amappl14 184 432 0 430 1 0 1 1 0 8 0 amappl13 176 123 0 111 1 0 1 1 0 8 0 amappl12 168 715 0 685 2 0 2 2 0 8 0 amappl11 160 5 0 4 1 0 1 1 0 8 0 amappl10 152 66 0 52 1 0 1 1 0 8 0 amappl9 144 279 0 279 1 0 1 1 0 8 1 amappl8 136 101 0 99 1 0 1 1 0 8 0 amappl7 128 146 0 133 1 0 1 1 0 8 0 amappl6 120 154 0 153 1 0 1 1 0 8 0 amappl5 112 96 0 85 1 0 1 1 0 8 0 amappl4 104 295 0 276 1 0 1 1 0 8 0 amappl3 96 1588 0 1485 3 0 3 3 0 8 0 amappl2 88 542 0 479 2 0 2 2 0 8 0 amappl1 80 10499 0 9895 15 0 15 15 0 8 1 amappl 88 2659 0 2515 4 0 4 4 0 92 0 uvmvnodes 80 99 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 461 0 430 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 461 0 430 1 0 1 1 0 8 0 vmmpekpl 168 5831 0 5801 2 0 2 2 0 8 0 vmmpepl 168 39089 0 37215 87 0 87 87 0 357 2 vmsppl 488 460 0 430 5 0 5 5 0 8 0 rwobjpl 80 14757 0 13752 24 0 24 24 0 8 0 pdppl 4096 929 0 860 95 12 83 83 0 8 14 pvpl 32 9539 0 0 77 0 77 77 0 265 0 pmappl 256 460 0 430 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 412 0 15 12 0 12 12 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x75e571c55e20, count: -1 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp 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 x86_bus_space_io_read_1(3f8,5) at x86_bus_space_io_read_1+0x37 sys/arch/amd64/amd64/bus_space.c:670 comcnputc(800,61) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1671 [inline] comcnputc(800,61) at comcnputc+0x250 sys/dev/ic/com.c:1274 cnputc(61) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(61) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff834af377) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80003a3b5340) at db_ktrap+0x1b6 db_printtrap sys/arch/amd64/amd64/db_interface.c:103 [inline] db_ktrap(6,0,ffff80003a3b5340) at db_ktrap+0x1b6 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80003a3b5340) at kerntrap+0x243 sys/arch/amd64/amd64/trap.c:519 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff800032f9bca8,fffff7006c8ed8a0,ffff80003a3b5520) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691 sys_futimes(ffff800032f9bca8,ffff80003a3b5670,ffff80003a3b55c0) at sys_futimes+0x208 sys/kern/vfs_syscalls.c:2733 end trace frame: 0xffff80003a3b5660, count: 0 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 x86_bus_space_io_read_1(3f8,5) at x86_bus_space_io_read_1+0x37 sys/arch/amd64/amd64/bus_space.c:670 comcnputc(800,61) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1671 [inline] comcnputc(800,61) at comcnputc+0x250 sys/dev/ic/com.c:1274 cnputc(61) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(61) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff834af377) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80003a3b5340) at db_ktrap+0x1b6 db_printtrap sys/arch/amd64/amd64/db_interface.c:103 [inline] db_ktrap(6,0,ffff80003a3b5340) at db_ktrap+0x1b6 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80003a3b5340) at kerntrap+0x243 sys/arch/amd64/amd64/trap.c:519 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff800032f9bca8,fffff7006c8ed8a0,ffff80003a3b5520) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691 sys_futimes(ffff800032f9bca8,ffff80003a3b5670,ffff80003a3b55c0) at sys_futimes+0x208 sys/kern/vfs_syscalls.c:2733 syscall(ffff80003a3b5670) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a3b5670) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x85b83b881b0, count: -16