witness: lock order reversal: 1st 0xffff800001ad0c80 vmmaplk (&map->lock) 2nd 0xffff800001b83598 inode (&ip->i_lock) lock order [1] vmmaplk (&map->lock) -> [2] inode (&ip->i_lock) #0 rw_do_enter_write+0xc4 sys/kern/kern_rwlock.c:234 #1 rrw_enter+0xf0 sys/kern/kern_rwlock.c:621 #2 VOP_LOCK+0x17e sys/kern/vfs_vops.c:527 #3 vn_lock+0xca sys/kern/vfs_vnops.c:576 #4 vn_rdwr+0x138 sys/kern/vfs_vnops.c:326 #5 vndstrategy+0x8e4 sys/dev/vnd.c:342 #6 physio+0x581 sys/kern/kern_physio.c:162 #7 spec_read+0x29a sys/kern/spec_vnops.c:215 #8 VOP_READ+0x1a8 sys/kern/vfs_vops.c:227 #9 vn_read+0x1fc sys/kern/vfs_vnops.c:375 #10 dofilereadv+0x386 sys/kern/sys_generic.c:252 #11 sys_read+0x141 sys/kern/sys_generic.c:172 #12 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #13 Xsyscall+0x128 lock order [2] inode (&ip->i_lock) -> [1] vmmaplk (&map->lock) #0 rw_do_enter_read+0x8b sys/kern/kern_rwlock.c:355 #1 uvmfault_lookup+0x1a2 sys/uvm/uvm_fault.c:-1 #2 uvm_fault_check+0x43 sys/uvm/uvm_fault.c:693 #3 uvm_fault+0x1e7 sys/uvm/uvm_fault.c:627 #4 kpageflttrap+0x41e sys/arch/amd64/amd64/trap.c:285 #5 kerntrap+0x1b6 sys/arch/amd64/amd64/trap.c:532 #6 alltraps_kern_meltdown+0x7b #7 copyout+0x59 #8 ffs_read+0x701 sys/ufs/ffs/ffs_vnops.c:254 #9 VOP_READ+0x1a8 sys/kern/vfs_vops.c:227 #10 vn_rdwr+0x1bc sys/kern/vfs_vnops.c:-1 #11 vmcmd_map_readvn+0x20a sys/kern/exec_subr.c:250 #12 exec_process_vmcmds+0x164 sys/kern/exec_subr.c:139 #13 sys_execve+0x1354 sys/kern/kern_exec.c:540 #14 start_init+0x5fb sys/kern/init_main.c:732 #15 proc_trampoline+0x10 Stopped at db_enter+0x17: popq %rbp 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 kasan: no report recorded this boot ddb{0}> trace db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 witness_checkorder(ffff800001b83598,9,0) at witness_checkorder+0x19db sys/kern/subr_witness.c:-1 rw_do_enter_write(ffff800001b83580,1) at rw_do_enter_write+0xc4 sys/kern/kern_rwlock.c:234 rrw_enter(ffff800001b83580,1) at rrw_enter+0xf0 sys/kern/kern_rwlock.c:621 VOP_LOCK(ffff800001cbab50,2001) at VOP_LOCK+0x17e sys/kern/vfs_vops.c:527 vn_lock(ffff800001cbab50,2001) at vn_lock+0xca sys/kern/vfs_vnops.c:576 vn_rdwr(0,ffff800001cbab50,ffff800011b06380,94,0,1,ffff800000d9b5b8,ffff800001d18cc0,ffff800001d18d30,ffffffff84f6eff0) at vn_rdwr+0x138 sys/kern/vfs_vnops.c:326 vndstrategy(ffff800001d18cc0) at vndstrategy+0x8e4 sys/dev/vnd.c:342 physio(ffffffff83c7e780,2902,8000,ffffffff833ec6c0,ffff800029efece0) at physio+0x581 sys/kern/kern_physio.c:162 spec_read(ffff800029efeaa0) at spec_read+0x29a sys/kern/spec_vnops.c:215 VOP_READ(ffff800001973bd8,ffff800029efece0,0,ffff800000119548) at VOP_READ+0x1a8 sys/kern/vfs_vops.c:227 vn_read(ffff800001ba63e8,ffff800029efece0,0) at vn_read+0x1fc sys/kern/vfs_vnops.c:375 dofilereadv(ffff8000298e4540,6,ffff800029efece0,0,ffff800029efeea0) at dofilereadv+0x386 sys/kern/sys_generic.c:252 sys_read(ffff8000298e4540,ffff800029efef30,ffff800029efeea0) at sys_read+0x141 sys/kern/sys_generic.c:172 syscall(ffff800029efef30) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800029efef30) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xcee3d87eaa0, count: -16 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff800029efe1a0 rbx 0xffffffff84991460 .str.41 rdx 0xffff800000175380 rcx 0x7ffff acpi_pdirpa+0x6be70 rax 0xffff8000342e7000 r8 0xffff800029efdf80 r9 0xffff800029efdf20 r10 0xffff800029efe458 r11 0xffffffff821db0c0 x86_bus_space_io_read_1 r12 0xffffffff84a296e0 ffs_vget.__lock_type r13 0xffff800001ad0c80 r14 0x3 r15 0xffffffff84a29720 .str.13 rip 0xffffffff8107c237 db_enter+0x17 cs 0x8 rflags 0x246 rsp 0xffff800029efe1a0 ss 0x10 db_enter+0x17: popq %rbp ddb{0}> show proc PROC (syz-executor) tid=173029 pid=53294 tcnt=2 stat=onproc flags process=10 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000298e47d8,0xffff8000393214f8 process=0xffff80003931b0a0 user=0xffff800029ef3000, vmspace=0xffff800001ad0b80 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 6311 501154 1 0 2 0x2 0 getty 58139 241759 47625 0 2 0 0 syz-executor 58139 369505 47625 0 2 0 0x4000000 syz-executor 53294 283466 46020 0 2 0x10 0 syz-executor *53294 173029 46020 0 7 0x10 0x4000000 syz-executor 29200 103461 47502 0 2 0 0 syz-executor 68541 62427 80052 0 2 0 0 syz-executor 68541 144109 80052 0 2 0 0x4000000 syz-executor 89690 508669 93711 0 2 0x10 0 syz-executor 89690 397859 93711 0 3 0x10 0x4000080 ttyout syz-executor 89131 451720 51750 0 7 0x100002 0 sh 51750 50532 76490 0 3 0x2 0x80 wait syz-executor 78691 64618 76490 0 2 0x10000002 0 syz-executor 47502 404491 76490 0 2 0x2 0 syz-executor 8853 318417 0 0 3 0x14000 0x280 nfsidl nfsio 64194 516407 0 0 3 0x14000 0x280 nfsidl nfsio 27248 133912 0 0 3 0x14000 0x280 nfsidl nfsio 75923 244835 0 0 3 0x14000 0x280 nfsidl nfsio 76493 368654 0 0 3 0x14000 0x280 nfsidl nfsio 92609 34272 0 0 3 0x14000 0x280 nfsidl nfsio 94926 100729 0 0 3 0x14000 0x280 nfsidl nfsio 89252 50870 0 0 3 0x14000 0x280 nfsidl nfsio 99844 238417 0 0 3 0x14000 0x280 nfsidl nfsio 30881 287953 0 0 3 0x14000 0x280 nfsidl nfsio 44094 336013 0 0 3 0x14000 0x280 nfsidl nfsio 40696 152327 0 0 3 0x14000 0x280 nfsidl nfsio 62615 43238 0 0 3 0x14000 0x280 nfsidl nfsio 86800 175355 0 0 3 0x14000 0x280 nfsidl nfsio 40862 365981 0 0 3 0x14000 0x280 nfsidl nfsio 78383 434775 0 0 3 0x14000 0x280 nfsidl nfsio 92491 410229 0 0 3 0x14000 0x280 nfsidl nfsio 56571 273218 0 0 3 0x14000 0x280 nfsidl nfsio 67611 349772 0 0 3 0x14000 0x280 nfsidl nfsio 55082 488999 0 0 3 0x14000 0x280 nfsidl nfsio 93711 409654 76490 0 3 0x2 0x80 nanoslp syz-executor 80052 429126 76490 0 3 0x2 0x80 nanoslp syz-executor 46020 395173 76490 0 3 0x2 0x80 nanoslp syz-executor 96272 123001 0 0 3 0x14000 0x200 acct acct 47625 246985 76490 0 3 0x2 0x80 nanoslp syz-executor 76490 238970 1 0 3 0x2 0x80 wait syz-executor 69526 383437 8649 74 3 0x1100012 0x80 bpf pflogd 8649 509659 1 0 3 0 0x80 sbwait pflogd 80383 107147 1 73 3 0x1100010 0x80 kqread syslogd 27542 228522 0 0 3 0x14000 0x200 bored smr 7104 496602 0 0 2 0x14000 0x200 zerothread 48065 65990 0 0 3 0x14000 0x200 aiodoned aiodoned 19121 428336 0 0 3 0x14000 0x200 syncer update 58790 363896 0 0 3 0x14000 0x200 cleaner cleaner 9297 203512 0 0 3 0x14000 0x200 reaper reaper 69731 46586 0 0 3 0x14000 0x200 pgdaemon pagedaemon 71692 510684 0 0 3 0x14000 0x200 bored viomb 77418 378981 0 0 3 0x14000 0x40000200 acpi0 acpi0 6518 436352 0 0 3 0x14000 0x40000200 idle1 93070 257007 0 0 3 0x14000 0x200 bored softnet1 76884 164332 0 0 3 0x14000 0x200 bored softnet0 55931 35883 0 0 3 0x14000 0x200 smrbar systqmp 87863 499327 0 0 3 0x14000 0x200 bored systq 48303 7140 0 0 3 0x14000 0x200 tmoslp softclockmp 982 405802 0 0 3 0x14000 0x40000200 tmoslp softclock 16599 199794 0 0 3 0x14000 0x40000200 idle0 1 85434 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{0}> show all locks Process 53294 (syz-executor) thread 0xffff8000298e4540 (173029) shared rwlock vmmaplk r = 0 (0xffff800001ad0c80) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 rw_do_enter_read+0x55d sys/kern/kern_rwlock.c:413 #2 uvm_vslock_device+0x1bc sys/uvm/uvm_glue.c:173 #3 physio+0x4a7 sys/kern/kern_physio.c:139 #4 spec_read+0x29a sys/kern/spec_vnops.c:215 #5 VOP_READ+0x1a8 sys/kern/vfs_vops.c:227 #6 vn_read+0x1fc sys/kern/vfs_vnops.c:375 #7 dofilereadv+0x386 sys/kern/sys_generic.c:252 #8 sys_read+0x141 sys/kern/sys_generic.c:172 #9 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #10 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff85609240) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 vn_read+0x83 sys/kern/vfs_vnops.c:357 #2 dofilereadv+0x386 sys/kern/sys_generic.c:252 #3 sys_read+0x141 sys/kern/sys_generic.c:172 #4 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #5 Xsyscall+0x128 Process 55931 (systqmp) thread 0xffff800045ffe530 (35883) shared rwlock systqmp r = 0 (0xffffffff84f4ea98) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x1ba sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11070 12259K 12403K 166960K 12350 0 pcb 19 28K 32K 166960K 98 0 rtable 225 16K 22K 166960K 1005 0 pf 34 22K 54K 166960K 123 0 ifaddr 40 12K 15K 166960K 140 0 ifgroup 53 2K 2K 166960K 151 0 sysctl 3 1K 13K 166960K 7 0 counters 70 42K 43K 166960K 120 0 ioctlops 4 4K 197K 166960K 1610 0 iov 0 0K 18K 166960K 13 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1351 87K 89K 166960K 1749 0 UFS quota 1 36K 36K 166960K 1 0 UFS mount 5 44K 44K 166960K 5 0 shm 2 2K 6K 166960K 8 0 VM map 2 1K 1K 166960K 2 0 sem 28 1K 3K 166960K 46 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 405K 166960K 12470 0 file desc 18 60K 125K 166960K 693 0 sigio 1 0K 0K 166960K 3 0 proc 104 50K 179K 166960K 1205 0 subproc 81 10K 13K 166960K 279 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 20K 20K 166960K 1 0 ip_moptions 0 0K 0K 166960K 6 0 in_multi 88 6K 8K 166960K 342 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 21 0 ISOFS mount 1 36K 36K 166960K 1 0 MSDOSFS mount 1 20K 20K 166960K 1 0 ttys 61 425K 425K 166960K 61 0 exec 22 5K 19K 166960K 775 0 fusefs mount 1 36K 36K 166960K 1 0 pfkey data 1 0K 0K 166960K 1 0 tdb 3 1K 1K 166960K 3 0 VM swap 14 124K 124K 166960K 15 0 UVM amap 535 214K 379K 166960K 6917 0 UVM aobj 11 4K 4K 166960K 13 0 pinsyscall 132 236K 383K 166960K 2428 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 4 0K 0K 166960K 81 0 NDP 20 1K 2K 166960K 97 0 temp 238 9287K 9472K 166960K 19052 0 kqueue 25 88K 97K 166960K 73 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 78 0 78 1 0 1 1 0 8 1 rtentry 176 355 0 276 6 0 6 6 0 8 1 unpcb 144 592 0 580 4 1 3 4 0 8 2 syncache 336 4 0 4 2 2 0 1 0 8 0 tcpcb 736 62 0 61 4 2 2 4 0 8 1 arp 136 62 0 50 1 0 1 1 0 8 0 inpcb 328 587 0 586 7 0 7 7 0 8 6 nd6 152 92 0 75 2 0 2 2 0 8 1 pkpcb 40 1 0 1 1 0 1 1 0 8 1 kcovpl 48 31 0 23 1 0 1 1 0 8 0 ppxss 1192 2 0 2 2 1 1 1 0 8 1 pffrag 232 2 0 0 1 0 1 1 0 482 0 pffrnode 88 2 0 0 1 0 1 1 0 8 0 pffrent 40 2 0 0 1 0 1 1 0 8 0 pfosfp 40 1428 0 1428 5 5 0 5 0 8 0 pfosfpen 112 1428 0 1428 21 6 15 21 0 8 15 pfanchor 1288 4 0 0 1 0 1 1 0 8 0 pfstitem 24 44 0 8 1 0 1 1 0 8 0 pfstkey 128 44 0 8 2 0 2 2 0 8 0 pfstate 448 44 0 8 5 0 5 5 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 1434 0 1059 29 0 29 29 0 8 2 art_table 40 1435 0 1059 5 0 5 5 0 8 0 art_node 32 355 0 273 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 72 44 0 19 1 0 1 1 0 8 0 shmpl 120 10 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1980 0 463 95 0 95 95 0 8 0 ffsino 296 1980 0 463 117 0 117 117 0 8 0 nchpl 144 2520 0 754 66 0 66 66 0 8 0 vnodes 216 2379 0 0 133 0 133 133 0 8 0 namei 1024 12239 0 12239 3 2 1 2 0 8 1 percpumem 16 76 0 28 1 0 1 1 0 8 0 kstatmem 264 77 0 56 2 0 2 2 0 8 0 scxspl 216 9189 0 9189 10 2 8 8 1 8 8 plimitpl 152 68 0 56 1 0 1 1 0 8 0 sigapl 424 986 0 927 10 1 9 9 0 8 0 knotepl 120 144 0 0 5 0 5 5 0 8 0 kqueuepl 224 107 0 104 2 0 2 2 0 8 1 pipepl 344 325 0 297 6 0 6 6 0 8 3 fdescpl 528 949 0 928 3 0 3 3 0 8 0 filepl 160 4686 0 4505 15 0 15 15 0 8 4 lockfpl 104 400 0 399 1 0 1 1 0 8 0 lockfspl 48 37 0 36 1 0 1 1 0 8 0 sessionpl 144 58 0 54 1 0 1 1 0 8 0 pgrppl 48 89 0 77 1 0 1 1 0 8 0 ucredpl 104 429 0 418 1 0 1 1 0 8 0 zombiepl 144 929 0 927 1 0 1 1 0 8 0 processpl 1240 986 0 927 7 1 6 6 0 8 0 procpl 664 1423 0 1360 8 0 8 8 0 8 1 sosppl 176 3 0 3 2 1 1 1 0 8 1 sockpl 752 1267 0 1254 11 1 10 11 0 8 7 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k128 9344 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 124 0 0 16 0 16 16 0 8 0 mcl2k 2048 77 0 0 10 0 10 10 0 8 0 mextrefs 64 22 0 0 1 0 1 1 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 311 0 0 20 0 20 20 0 8 0 bufpl 272 3079 0 107 199 0 199 199 0 8 0 anonpl 32 9533 0 0 77 0 77 77 0 222 0 amapchunkpl 152 19758 0 19456 26 0 26 26 0 158 9 amappl16 200 2700 0 2687 20 10 10 15 0 8 8 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 697 0 696 1 0 1 1 0 8 0 amappl13 176 169 0 166 1 0 1 1 0 8 0 amappl12 168 1322 0 1303 2 0 2 2 0 8 0 amappl11 160 9 0 8 2 1 1 1 0 8 0 amappl10 152 67 0 61 1 0 1 1 0 8 0 amappl9 144 279 0 279 1 1 0 1 0 8 0 amappl8 136 189 0 187 1 0 1 1 0 8 0 amappl7 128 194 0 188 1 0 1 1 0 8 0 amappl6 120 380 0 379 1 0 1 1 0 8 0 amappl5 112 103 0 98 1 0 1 1 0 8 0 amappl4 104 367 0 356 1 0 1 1 0 8 0 amappl3 96 3917 0 3846 4 0 4 4 0 8 0 amappl2 88 737 0 716 2 0 2 2 0 8 0 amappl1 80 14239 0 14058 15 1 14 15 0 8 3 amappl 88 5769 0 5665 4 0 4 4 0 92 0 uvmvnodes 80 107 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 12 0 2 1 0 1 1 0 8 0 uaddrrnd 24 949 0 928 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 949 0 928 1 0 1 1 0 8 0 vmmpekpl 168 10018 0 9971 3 0 3 3 0 8 0 vmmpepl 168 70052 0 69119 98 1 97 98 0 357 31 vmsppl 488 948 0 928 5 0 5 5 0 8 0 rwobjpl 80 22770 0 22251 28 2 26 27 0 8 2 pdppl 4096 1907 0 1856 119 42 77 89 0 8 26 pvpl 32 17055 0 0 139 1 138 138 0 265 0 pmappl 256 948 0 928 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 120 517 0 51 15 0 15 15 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 witness_checkorder(ffff800001b83598,9,0) at witness_checkorder+0x19db sys/kern/subr_witness.c:-1 rw_do_enter_write(ffff800001b83580,1) at rw_do_enter_write+0xc4 sys/kern/kern_rwlock.c:234 rrw_enter(ffff800001b83580,1) at rrw_enter+0xf0 sys/kern/kern_rwlock.c:621 VOP_LOCK(ffff800001cbab50,2001) at VOP_LOCK+0x17e sys/kern/vfs_vops.c:527 vn_lock(ffff800001cbab50,2001) at vn_lock+0xca sys/kern/vfs_vnops.c:576 vn_rdwr(0,ffff800001cbab50,ffff800011b06380,94,0,1,ffff800000d9b5b8,ffff800001d18cc0,ffff800001d18d30,ffffffff84f6eff0) at vn_rdwr+0x138 sys/kern/vfs_vnops.c:326 vndstrategy(ffff800001d18cc0) at vndstrategy+0x8e4 sys/dev/vnd.c:342 physio(ffffffff83c7e780,2902,8000,ffffffff833ec6c0,ffff800029efece0) at physio+0x581 sys/kern/kern_physio.c:162 spec_read(ffff800029efeaa0) at spec_read+0x29a sys/kern/spec_vnops.c:215 VOP_READ(ffff800001973bd8,ffff800029efece0,0,ffff800000119548) at VOP_READ+0x1a8 sys/kern/vfs_vops.c:227 vn_read(ffff800001ba63e8,ffff800029efece0,0) at vn_read+0x1fc sys/kern/vfs_vnops.c:375 dofilereadv(ffff8000298e4540,6,ffff800029efece0,0,ffff800029efeea0) at dofilereadv+0x386 sys/kern/sys_generic.c:252 sys_read(ffff8000298e4540,ffff800029efef30,ffff800029efeea0) at sys_read+0x141 sys/kern/sys_generic.c:172 syscall(ffff800029efef30) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800029efef30) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xcee3d87eaa0, count: -16 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x19: leave ddb{1}> trace x86_ipi_db(ffff800028fd3ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412 x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 kasan_shadow_4byte_isvalid(ffffffff85609238) at kasan_shadow_4byte_isvalid+0x35 sys/kern/kasan_shadow.h:130 __asan_load4_noabort(ffffffff85609238) at __asan_load4_noabort+0x53 kasan_shadow_check sys/kern/subr_kasan.c:-1 [inline] __asan_load4_noabort(ffffffff85609238) at __asan_load4_noabort+0x53 sys/kern/subr_kasan.c:1098 __mp_lock(ffffffff85608a40) at __mp_lock+0x27a __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85608a40) at __mp_lock+0x27a sys/kern/kern_lock.c:173 syscall(ffff80002a73a180) at syscall+0x1048 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80002a73a180) at syscall+0x1048 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ddeaa1e9050, count: -8 ddb{1}>