panic: kernel diagnostic assertion "tname->un_flags & UNVEIL_USERSET" failed: file "/syzkaller/managers/setuid/kernel/sys/kern/kern_unveil.c", line 879 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *111080 44337 0 0 0 1K syz-executor2903 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x174 sys/kern/subr_prf.c:208 __assert(ffffffff81f7bdfb,ffffffff81f325a7,36f,ffffffff81f8b7f3) at __assert+0x2e sys/kern/subr_prf.c:155 unveil_check_final(ffff800020b76bc8,ffff800020bacca8) at unveil_check_final+0x81d sys/kern/kern_unveil.c:879 namei(ffff800020bacca8) at namei+0x88b sys/kern/vfs_lookup.c:232 dosymlinkat(ffff800020b76bc8,20000000,3,20000180) at dosymlinkat+0xcd sys/kern/vfs_syscalls.c:1613 syscall(ffff800020bacf60) at syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020bacf60) at syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,7f7ffffe1d18,0,1,0) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe1ca0, count: 7 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic kernel diagnostic assertion "tname->un_flags & UNVEIL_USERSET" failed: file "/syzkaller/managers/setuid/kernel/sys/kern/kern_unveil.c", line 879 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x174 sys/kern/subr_prf.c:208 __assert(ffffffff81f7bdfb,ffffffff81f325a7,36f,ffffffff81f8b7f3) at __assert+0x2e sys/kern/subr_prf.c:155 unveil_check_final(ffff800020b76bc8,ffff800020bacca8) at unveil_check_final+0x81d sys/kern/kern_unveil.c:879 namei(ffff800020bacca8) at namei+0x88b sys/kern/vfs_lookup.c:232 dosymlinkat(ffff800020b76bc8,20000000,3,20000180) at dosymlinkat+0xcd sys/kern/vfs_syscalls.c:1613 syscall(ffff800020bacf60) at syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020bacf60) at syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,7f7ffffe1d18,0,1,0) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe1ca0, count: -8 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020baca40 rbx 0xffff800020bacaf0 rdx 0xffffffff81f2146b cmd0646_9_tim_udma+0x16736 rcx 0x201 rax 0x1 r8 0xffffffff81e2f083 kprintf+0x183 r9 0x1 r10 0xc35405830ca3cba9 r11 0xeaacfaf28de2b4b9 r12 0x3000000008 r13 0xffff800020baca50 r14 0x100 r15 0x1 rip 0xffffffff8188e158 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020baca30 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor2903) pid=111080 stat=onproc flags process=0 proc=0 pri=53, usrpri=53, nice=20 forw=0xffffffffffffffff, list=0xffff800020b77528,0xffffffff82352f38 process=0xffff800020b8c9f0 user=0xffff800020ba8000, vmspace=0xfffffd806e91c2d8 estcpu=3, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *44337 111080 85061 0 7 0 syz-executor2903 85061 160540 96442 0 3 0x82 nanosleep syz-executor2903 96442 169594 55678 0 3 0x10008a pause ksh 55678 490111 78152 0 3 0x92 select sshd 14159 171017 1 0 3 0x100083 ttyin getty 78152 216366 1 0 3 0x80 select sshd 80401 391736 33983 73 3 0x100090 kqread syslogd 33983 347386 1 0 3 0x100082 netio syslogd 97 395835 1 77 3 0x100090 poll dhclient 71871 176302 1 0 3 0x80 poll dhclient 32054 70128 0 0 3 0x14200 pgzero zerothread 44838 382340 0 0 3 0x14200 aiodoned aiodoned 94283 406735 0 0 3 0x14200 syncer update 87380 231989 0 0 3 0x14200 cleaner cleaner 97467 127921 0 0 3 0x14200 reaper reaper 21747 420167 0 0 3 0x14200 pgdaemon pagedaemon 44294 79175 0 0 3 0x14200 bored crynlk 68123 313157 0 0 3 0x14200 bored crypto 6038 158880 0 0 3 0x40014200 acpi0 acpi0 13963 181801 0 0 3 0x40014200 idle1 83999 199 0 0 3 0x14200 bored softnet 80026 236400 0 0 3 0x14200 bored systqmp 16981 437132 0 0 3 0x14200 bored systq 4437 240412 0 0 3 0x40014200 bored softclock 51615 283298 0 0 7 0x40014200 idle0 66968 463598 0 0 3 0x14200 bored smr 1 352616 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 44337 (syz-executor2903) thread 0xffff800020b76bc8 (111080) exclusive rrwlock inode r = 0 (0xfffffd8078e01f80) locked @ /syzkaller/managers/setuid/kernel/sys/ufs/ufs/ufs_vnops.c:1547 #0 witness_lock+0x594 sys/kern/subr_witness.c:1201 #1 _rw_enter+0x45d sys/kern/kern_rwlock.c:280 #2 _rrw_enter+0x60 sys/kern/kern_rwlock.c:410 #3 VOP_LOCK+0x57 sys/kern/vfs_vops.c:602 #4 vn_lock+0x6e sys/kern/vfs_vnops.c:549 #5 vfs_lookup+0xf5 sys/kern/vfs_lookup.c:387 #6 namei+0x4b2 sys/kern/vfs_lookup.c:224 #7 dosymlinkat+0xcd sys/kern/vfs_syscalls.c:1613 #8 syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] #8 syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 #9 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82342968) locked @ /syzkaller/managers/setuid/kernel/sys/sys/syscall_mi.h:90 #0 witness_lock+0x594 sys/kern/subr_witness.c:1201 #1 syscall+0x48b mi_syscall sys/sys/syscall_mi.h:91 [inline] #1 syscall+0x48b sys/arch/amd64/amd64/trap.c:574 #2 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9442 6315K 6316K 78643K 10529 0 0 pcb 23 9K 9K 78643K 55 0 0 rtable 61 2K 2K 78643K 115 0 0 ifaddr 21 7K 7K 78643K 21 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 13 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1166 73K 73K 78643K 1171 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 1K 78643K 2 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 2 0K 0K 78643K 2 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12628 0 0 file desc 1 0K 0K 78643K 1 0 0 proc 43 50K 58K 78643K 211 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 in_multi 11 0K 0K 78643K 11 0 0 ether_multi 1 0K 0K 78643K 1 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 18 79K 79K 78643K 18 0 0 exec 0 0K 1K 78643K 152 0 0 pagedep 1 8K 8K 78643K 1 0 0 inodedep 1 32K 32K 78643K 1 0 0 newblk 1 0K 0K 78643K 1 0 0 VM swap 7 26K 26K 78643K 7 0 0 UVM amap 47 2K 3K 78643K 659 0 0 UVM aobj 2 2K 2K 78643K 2 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 NDP 3 0K 0K 78643K 3 0 0 temp 30 2359K 2423K 78643K 1718 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 2 0 0 1 0 1 1 0 8 0 inpcbpl 280 22 0 16 1 0 1 1 0 8 0 plimitpl 152 13 0 8 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 syncache 264 5 0 5 1 0 1 1 0 8 1 tcpcb 544 8 0 5 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 96 0 0 6 0 6 6 0 8 0 art_table 32 97 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1382 0 16 45 0 45 45 0 8 0 ffsino 272 1382 0 16 92 0 92 92 0 8 0 nchpl 144 1557 0 30 57 0 57 57 0 8 0 uvmvnodes 72 1391 0 0 26 0 26 26 0 8 0 vnodes 200 1391 0 0 74 0 74 74 0 8 0 namei 1024 3288 0 3286 2 1 1 1 0 8 0 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 2359 0 2359 7 2 5 5 0 8 5 sigapl 432 177 0 166 2 0 2 2 0 8 0 knotepl 112 5 0 0 1 0 1 1 0 8 0 kqueuepl 104 1 0 0 1 0 1 1 0 8 0 pipepl 112 118 0 111 2 1 1 1 0 8 0 fdescpl 488 178 0 166 2 0 2 2 0 8 0 filepl 152 818 0 775 2 0 2 2 0 8 0 lockfpl 104 6 0 6 1 1 0 1 0 8 0 lockfspl 32 3 0 3 1 1 0 1 0 8 0 sessionpl 112 17 0 9 1 0 1 1 0 8 0 pgrppl 48 17 0 9 1 0 1 1 0 8 0 ucredpl 96 47 0 40 1 0 1 1 0 8 0 zombiepl 144 166 0 166 2 1 1 1 0 8 1 processpl 840 193 0 166 4 0 4 4 0 8 0 procpl 600 193 0 166 3 0 3 3 0 8 0 sockpl 384 64 0 48 2 0 2 2 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 72 0 0 9 0 9 9 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 90 0 0 6 0 6 6 0 8 0 bufpl 256 2052 0 254 113 0 113 113 0 8 0 anonpl 16 17003 0 15894 6 1 5 6 0 125 0 amapchunkpl 152 492 0 456 2 0 2 2 0 158 0 amappl16 192 34 0 32 1 0 1 1 0 8 0 amappl15 184 44 0 40 1 0 1 1 0 8 0 amappl14 176 14 0 13 2 1 1 1 0 8 0 amappl13 168 22 0 19 1 0 1 1 0 8 0 amappl12 160 8 0 8 1 0 1 1 0 8 1 amappl11 152 24 0 13 1 0 1 1 0 8 0 amappl10 144 45 0 45 2 1 1 1 0 8 1 amappl9 136 377 0 376 1 0 1 1 0 8 0 amappl8 128 82 0 78 1 0 1 1 0 8 0 amappl7 120 12 0 11 1 0 1 1 0 8 0 amappl6 112 40 0 35 1 0 1 1 0 8 0 amappl5 104 123 0 113 1 0 1 1 0 8 0 amappl4 96 365 0 344 1 0 1 1 0 8 0 amappl3 88 105 0 100 1 0 1 1 0 8 0 amappl2 80 569 0 533 1 0 1 1 0 8 0 amappl1 72 11715 0 11321 15 5 10 15 0 8 0 amappl 72 370 0 350 1 0 1 1 0 75 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma64 64 259 0 259 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 17 0 17 1 1 0 1 0 8 0 aobjpl 64 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 178 0 166 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 178 0 166 1 0 1 1 0 8 0 vmmpekpl 168 5255 0 5236 1 0 1 1 0 8 0 vmmpepl 168 23740 0 23033 52 18 34 43 0 357 2 vmsppl 360 177 0 166 2 0 2 2 0 8 0 pdppl 4096 364 0 332 5 0 5 5 0 8 0 pvpl 32 72010 0 69188 31 4 27 27 0 265 1 pmappl 224 177 0 166 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 241 0 3 7 0 7 7 0 8 0 ddb{1}>