login: panic: kernel diagnostic assertion "timo || _kernel_lock_held()" failed: file "/syzkaller/managers/setuid/kernel/sys/kern/kern_synch.c", line 121 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 388950 39601 0 0 0x4000000 0 syz-executor4793 *445333 85914 0 0 0x4000000 1 syz-executor4793 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 __assert(ffffffff81fb5b5c,ffffffff81fd515d,79,ffffffff81fc5830) at __assert+0x2e sys/kern/subr_prf.c:154 tsleep(fffffd806d2f5b40,8,ffffffff81fb40b2,0) at tsleep+0x3fb sleep_finish_all sys/kern/kern_synch.c:405 [inline] tsleep(fffffd806d2f5b40,8,ffffffff81fb40b2,0) at tsleep+0x3fb sys/kern/kern_synch.c:152 vn_seek(fffffd807b0024c0,ffff800020bb5808,0,ffff800020aff8b8) at vn_seek+0xa0 vn_lock sys/kern/vfs_vnops.c:556 [inline] vn_seek(fffffd807b0024c0,ffff800020bb5808,0,ffff800020aff8b8) at vn_seek+0xa0 sys/kern/vfs_vnops.c:611 sys_lseek(ffff800020aff8b8,ffff800020bb5878,ffff800020bb58e0) at sys_lseek+0x6f sys/kern/vfs_syscalls.c:1859 syscall(ffff800020bb5950) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800020bb5950) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,945385670c8,0,945385670a8,945385670a0) at Xsyscall+0x128 end of kernel end trace frame: 0x9483259cce0, 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 "timo || _kernel_lock_held()" failed: file "/syzkaller/managers/setuid/kernel/sys/kern/kern_synch.c", line 121 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 __assert(ffffffff81fb5b5c,ffffffff81fd515d,79,ffffffff81fc5830) at __assert+0x2e sys/kern/subr_prf.c:154 tsleep(fffffd806d2f5b40,8,ffffffff81fb40b2,0) at tsleep+0x3fb sleep_finish_all sys/kern/kern_synch.c:405 [inline] tsleep(fffffd806d2f5b40,8,ffffffff81fb40b2,0) at tsleep+0x3fb sys/kern/kern_synch.c:152 vn_seek(fffffd807b0024c0,ffff800020bb5808,0,ffff800020aff8b8) at vn_seek+0xa0 vn_lock sys/kern/vfs_vnops.c:556 [inline] vn_seek(fffffd807b0024c0,ffff800020bb5808,0,ffff800020aff8b8) at vn_seek+0xa0 sys/kern/vfs_vnops.c:611 sys_lseek(ffff800020aff8b8,ffff800020bb5878,ffff800020bb58e0) at sys_lseek+0x6f sys/kern/vfs_syscalls.c:1859 syscall(ffff800020bb5950) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800020bb5950) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,945385670c8,0,945385670a8,945385670a0) at Xsyscall+0x128 end of kernel end trace frame: 0x9483259cce0, count: -8 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020bb5590 rbx 0xffff800020bb5640 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff81b1c663 kprintf+0x173 r9 0x1 r10 0x4da86d535fba2a30 r11 0x821ce3a1a12ad9d8 r12 0x3000000008 r13 0xffff800020bb55a0 r14 0x100 r15 0x1 rip 0xffffffff811a7028 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020bb5580 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor4793) pid=445333 stat=onproc flags process=0 proc=4000000 pri=52, usrpri=52, nice=20 forw=0xffffffffffffffff, list=0xffff800020afe008,0xffff800020afe508 process=0xffff800020b2a710 user=0xffff800020bb0000, vmspace=0xfffffd806e8f1738 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 39601 204572 97462 0 2 0 syz-executor4793 39601 325977 97462 0 3 0x4000080 fsleep syz-executor4793 39601 388950 97462 0 7 0x4000000 syz-executor4793 85914 517016 1651 0 2 0 syz-executor4793 *85914 445333 1651 0 7 0x4000000 syz-executor4793 97462 32853 94562 0 3 0x80 nanosleep syz-executor4793 1651 153458 94562 0 3 0x80 nanosleep syz-executor4793 94562 493971 31450 0 3 0x82 nanosleep syz-executor4793 31450 33961 13540 0 3 0x10008a pause ksh 13540 372110 19139 0 3 0x92 select sshd 58890 442653 1 0 3 0x100083 ttyin getty 19139 226125 1 0 3 0x80 select sshd 85415 172628 15082 73 3 0x100090 kqread syslogd 15082 393815 1 0 3 0x100082 netio syslogd 84541 392921 1 77 3 0x100090 poll dhclient 14733 272732 1 0 3 0x80 poll dhclient 16976 486309 0 0 2 0x14200 zerothread 79982 446158 0 0 3 0x14200 aiodoned aiodoned 4777 348358 0 0 3 0x14200 syncer update 27634 260760 0 0 3 0x14200 cleaner cleaner 46161 60181 0 0 3 0x14200 reaper reaper 10408 215339 0 0 3 0x14200 pgdaemon pagedaemon 65729 320803 0 0 3 0x14200 bored crynlk 26764 505248 0 0 3 0x14200 bored crypto 55960 272271 0 0 3 0x40014200 acpi0 acpi0 4652 25522 0 0 3 0x40014200 idle1 97061 364490 0 0 3 0x14200 bored softnet 61173 183324 0 0 3 0x14200 bored systqmp 7216 452373 0 0 3 0x14200 bored systq 18286 289152 0 0 3 0x40014200 bored softclock 35173 355206 0 0 3 0x40014200 idle0 94142 143501 0 0 3 0x14200 bored smr 1 266328 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 39601 (syz-executor4793) thread 0xffff800020afe280 (388950) exclusive rwlock fdlock r = 0 (0xfffffd807f7c5058) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 ptmioctl+0xe7 sys/kern/tty_pty.c:1071 #2 VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 #3 vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 #4 sys_ioctl+0x5b8 #5 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #5 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #6 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9448 6316K 6317K 78643K 10535 0 0 pcb 13 8K 8K 78643K 13 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 1180 74K 74K 78643K 1618 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 12765 0 0 file desc 3 4K 5K 78643K 610 0 0 proc 40 38K 46K 78643K 257 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 42 185K 185K 78643K 42 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 64 3K 3K 78643K 1489 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 2731K 2795K 78643K 2120 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 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 15 0 13 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 120 27 0 19 1 0 1 1 0 8 0 syncache 264 5 0 5 2 1 1 1 0 8 1 tcpcb 544 8 0 5 1 0 1 1 0 8 0 inpcb 280 22 0 16 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 2029 0 650 45 0 45 45 0 8 0 ffsino 272 2029 0 650 92 0 92 92 0 8 0 nchpl 144 2419 0 880 58 0 58 58 0 8 0 uvmvnodes 72 2038 0 0 38 0 38 38 0 8 0 vnodes 200 2038 0 0 108 0 108 108 0 8 0 namei 1024 7508 0 7508 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 5107 0 5105 9 8 1 6 0 8 0 plimitpl 152 13 0 8 1 0 1 1 0 8 0 sigapl 432 381 0 367 2 0 2 2 0 8 0 futexpl 56 1501 0 1500 1 0 1 1 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 3 2 1 1 0 8 0 fdescpl 488 382 0 367 2 0 2 2 0 8 0 filepl 152 3469 0 3417 3 0 3 3 0 8 1 lockfpl 104 6 0 6 1 1 0 1 0 8 0 lockfspl 48 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 2476 0 2469 1 0 1 1 0 8 0 zombiepl 144 367 0 367 3 2 1 1 0 8 1 processpl 896 397 0 367 4 0 4 4 0 8 0 procpl 632 974 0 941 4 0 4 4 0 8 1 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 64 0 0 8 0 8 8 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 92 0 0 5 0 5 5 0 8 0 bufpl 256 2288 0 262 127 0 127 127 0 8 0 anonpl 16 30591 0 29323 8 2 6 6 0 125 0 amapchunkpl 152 1835 0 1790 3 0 3 3 0 158 1 amappl16 192 539 0 523 1 0 1 1 0 8 0 amappl14 176 36 0 32 1 0 1 1 0 8 0 amappl12 160 9 0 9 1 1 0 1 0 8 0 amappl11 152 42 0 31 1 0 1 1 0 8 0 amappl10 144 46 0 46 2 1 1 1 0 8 1 amappl9 136 400 0 399 1 0 1 1 0 8 0 amappl8 128 91 0 83 1 0 1 1 0 8 0 amappl7 120 14 0 13 1 0 1 1 0 8 0 amappl6 112 40 0 36 1 0 1 1 0 8 0 amappl5 104 119 0 110 1 0 1 1 0 8 0 amappl4 96 606 0 581 1 0 1 1 0 8 0 amappl3 88 350 0 336 1 0 1 1 0 8 0 amappl2 80 2355 0 2285 4 2 2 2 0 8 0 amappl1 72 18574 0 18147 14 4 10 14 0 8 0 amappl 80 1146 0 1120 1 0 1 1 0 84 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 24 382 0 367 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 382 0 367 1 0 1 1 0 8 0 vmmpekpl 168 6873 0 6855 1 0 1 1 0 8 0 vmmpepl 168 42685 0 41742 56 13 43 44 0 357 2 vmsppl 368 381 0 367 2 0 2 2 0 8 0 pdppl 4096 772 0 734 5 0 5 5 0 8 0 pvpl 32 98033 0 95021 34 8 26 26 0 265 1 pmappl 232 381 0 367 1 0 1 1 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 255 0 3 8 0 8 8 0 8 0