login: 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 158694 48878 0 0x2 0 1 syz-executor6441 * 56187 48878 0 0x2 0x4000000 0K syz-executor6441 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,ffff800020bb3708) at unveil_check_final+0x81d sys/kern/kern_unveil.c:879 namei(ffff800020bb3708) at namei+0x88b sys/kern/vfs_lookup.c:232 domkdirat(ffff800020b76bc8,ffffff9c,20000080,2) at domkdirat+0x81 sys/kern/vfs_syscalls.c:2866 syscall(ffff800020bb39c0) at syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020bb39c0) at syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,32d528770f0,0,32d528770d0,32d528770c8) at Xsyscall+0x128 end of kernel end trace frame: 0x3304d9db470, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic kernel diagnostic assertion "tname->un_flags & UNVEIL_USERSET" failed: file "/syzkaller/managers/setuid/kernel/sys/kern/kern_unveil.c", line 879 ddb{0}> 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,ffff800020bb3708) at unveil_check_final+0x81d sys/kern/kern_unveil.c:879 namei(ffff800020bb3708) at namei+0x88b sys/kern/vfs_lookup.c:232 domkdirat(ffff800020b76bc8,ffffff9c,20000080,2) at domkdirat+0x81 sys/kern/vfs_syscalls.c:2866 syscall(ffff800020bb39c0) at syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020bb39c0) at syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,32d528770f0,0,32d528770d0,32d528770c8) at Xsyscall+0x128 end of kernel end trace frame: 0x3304d9db470, count: -8 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800020bb34b0 rbx 0xffff800020bb3560 rdx 0xffffffff81f2146b cmd0646_9_tim_udma+0x16736 rcx 0x201 rax 0x1 r8 0xffffffff81e2f083 kprintf+0x183 r9 0x1 r10 0xbdc94fcb04d9c0a9 r11 0x176c14cdece414c8 r12 0x3000000008 r13 0xffff800020bb34c0 r14 0x100 r15 0x1 rip 0xffffffff8188e158 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020bb34a0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor6441) pid=56187 stat=onproc flags process=2 proc=4000000 pri=53, usrpri=53, nice=20 forw=0xffffffffffffffff, list=0xffff800020b76268,0xffffffff82352f38 process=0xffff800020b8c360 user=0xffff800020bae000, vmspace=0xfffffd806e91a008 estcpu=3, cpticks=2, pctcpu=0.0 user=0, sys=2, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 48878 158694 30898 0 7 0x2 syz-executor6441 48878 31037 30898 0 2 0x4000002 syz-executor6441 *48878 56187 30898 0 7 0x4000002 syz-executor6441 30898 394365 27437 0 3 0x10008a pause ksh 27437 1354 46631 0 3 0x92 select sshd 79186 466208 1 0 3 0x100083 ttyin getty 46631 523321 1 0 3 0x80 select sshd 33831 402233 30568 73 3 0x100090 kqread syslogd 30568 68807 1 0 3 0x100082 netio syslogd 50663 400880 1 77 3 0x100090 poll dhclient 75201 291224 1 0 3 0x80 poll dhclient 66403 384379 0 0 3 0x14200 pgzero zerothread 24952 355651 0 0 3 0x14200 aiodoned aiodoned 55139 387002 0 0 3 0x14200 syncer update 95424 473876 0 0 3 0x14200 cleaner cleaner 3579 325770 0 0 3 0x14200 reaper reaper 44599 113647 0 0 3 0x14200 pgdaemon pagedaemon 30969 32969 0 0 3 0x14200 bored crynlk 14486 213763 0 0 3 0x14200 bored crypto 34798 365285 0 0 3 0x40014200 acpi0 acpi0 71621 499291 0 0 3 0x40014200 idle1 81416 136264 0 0 3 0x14200 bored softnet 41158 431574 0 0 3 0x14200 bored systqmp 36926 414760 0 0 3 0x14200 bored systq 73788 151700 0 0 3 0x40014200 bored softclock 60001 260266 0 0 3 0x40014200 idle0 96846 263149 0 0 3 0x14200 bored smr 1 162451 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 48878 (syz-executor6441) thread 0xffff800020b76bc8 (56187) exclusive rrwlock inode r = 0 (0xfffffd806fb81f80) 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 vget+0x1c3 sys/kern/vfs_subr.c:672 #6 cache_lookup+0x300 sys/kern/vfs_cache.c:224 #7 ufs_lookup+0x1d7 sys/ufs/ufs/ufs_lookup.c:162 #8 VOP_LOOKUP+0x67 sys/kern/vfs_vops.c:90 #9 vfs_lookup+0x556 sys/kern/vfs_lookup.c:523 #10 namei+0x4b2 sys/kern/vfs_lookup.c:224 #11 domkdirat+0x81 sys/kern/vfs_syscalls.c:2866 #12 syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] #12 syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 #13 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{0}> 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 212 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 52 2K 3K 78643K 664 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{0}> 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 97 0 0 7 0 7 7 0 8 0 art_table 32 98 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 1556 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 3289 0 3288 2 1 1 1 0 8 0 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 2371 0 2371 8 2 6 6 0 8 6 sigapl 432 176 0 166 2 0 2 2 0 8 0 futexpl 56 1 0 1 1 0 1 1 0 8 1 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 112 122 0 115 2 1 1 1 0 8 0 fdescpl 488 177 0 166 2 0 2 2 0 8 0 filepl 152 821 0 779 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 840 192 0 166 4 0 4 4 0 8 0 procpl 600 194 0 166 3 0 3 3 0 8 0 sockpl 384 64 0 48 2 0 2 2 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 69 0 0 9 0 9 9 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 89 0 0 6 0 6 6 0 8 0 bufpl 256 2064 0 254 114 0 114 114 0 8 0 anonpl 16 17130 0 15984 6 1 5 6 0 125 0 amapchunkpl 152 495 0 456 2 0 2 2 0 158 0 amappl16 192 30 0 28 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 3 0 3 1 0 1 1 0 8 1 amappl11 152 20 0 9 1 0 1 1 0 8 0 amappl10 144 46 0 46 2 1 1 1 0 8 1 amappl9 136 391 0 389 1 0 1 1 0 8 0 amappl8 128 86 0 81 1 0 1 1 0 8 0 amappl7 120 13 0 12 1 0 1 1 0 8 0 amappl6 112 42 0 38 1 0 1 1 0 8 0 amappl5 104 113 0 104 1 0 1 1 0 8 0 amappl4 96 369 0 345 1 0 1 1 0 8 0 amappl3 88 106 0 100 1 0 1 1 0 8 0 amappl2 80 583 0 539 1 0 1 1 0 8 0 amappl1 72 11856 0 11454 14 4 10 14 0 8 0 amappl 72 371 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 24 177 0 166 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 177 0 166 1 0 1 1 0 8 0 vmmpekpl 168 5269 0 5250 1 0 1 1 0 8 0 vmmpepl 168 23762 0 23014 51 17 34 43 0 357 1 vmsppl 360 176 0 166 2 0 2 2 0 8 0 pdppl 4096 362 0 332 5 0 5 5 0 8 0 pvpl 32 72177 0 69301 31 4 27 27 0 265 1 pmappl 224 176 0 166 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 243 0 3 7 0 7 7 0 8 0 ddb{0}>