login: panic: kernel diagnostic assertion "__mp_lock_held(&sched_lock, curcpu()) == 0" failed: file "/syzkaller/managers/setuid/kernel/sys/kern/kern_lock.c", line 63 Stopped at db_enter+0xa: popq %rbp TID PID UID PRFLAGS PFLAGS CPU COMMAND db_enter() at db_enter+0xa sys/arch/amd64/amd64/db_interface.c:399 panic() at panic+0x147 sys/kern/subr_prf.c:208 __assert(ffffffff810e4b54,ffff80002119f580,ffff8000210a2270,ffff80000002f180) at __assert+0x24 sys/kern/subr_prf.c:155 _kernel_lock(ffff8000210a2270,ffff80002119a000) at _kernel_lock+0x125 sys/kern/kern_lock.c:63 pageflttrap() at pageflttrap+0x6c sys/arch/amd64/amd64/trap.c:163 kerntrap(9) at kerntrap+0x8d sys/arch/amd64/amd64/trap.c:294 alltraps_kern(6,0,ffffffffffffffff,0,9,ffff8000210a2270) at alltraps_kern+0x7b ptsignal(d25,ffff8000210a2270,ffff8000210b6668) at ptsignal+0x115 sys/kern/kern_sig.c:944 mi_switch() at mi_switch+0x1fb sys/kern/sched_bsd.c:392 sleep_finish(1,ffff80002119f810) at sleep_finish+0xd3 sys/kern/kern_synch.c:312 sleep_finish_all(ffff80002119f810,32) at sleep_finish_all+0x22 sleep_finish_timeout sys/kern/kern_synch.c:336 [inline] sleep_finish_all(ffff80002119f810,32) at sleep_finish_all+0x22 sys/kern/kern_synch.c:157 tsleep(ffff8000210b6668,ffff8000210a2270,ffffffff81511f74,ffff8000210b6688) at t sleep+0x142 exit1(ffff8000210a2270,0,ffffffff81511f74) at exit1+0x17b sys/kern/kern_exit.c:166 single_thread_check(80000,ffff8000210a2270) at single_thread_check+0xd6 sys/kern/kern_sig.c:1937 end trace frame: 0xffff80002119f910, count: 0 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}> show panic kernel diagnostic assertion "__mp_lock_held(&sched_lock, curcpu()) == 0" failed: file "/syzkaller/managers/setuid/kernel/sys/kern/kern_lock.c", line 63 ddb{0}> trace db_enter() at db_enter+0xa sys/arch/amd64/amd64/db_interface.c:399 panic() at panic+0x147 sys/kern/subr_prf.c:208 __assert(ffffffff810e4b54,ffff80002119f580,ffff8000210a2270,ffff80000002f180) at __assert+0x24 sys/kern/subr_prf.c:155 _kernel_lock(ffff8000210a2270,ffff80002119a000) at _kernel_lock+0x125 sys/kern/kern_lock.c:63 pageflttrap() at pageflttrap+0x6c sys/arch/amd64/amd64/trap.c:163 kerntrap(9) at kerntrap+0x8d sys/arch/amd64/amd64/trap.c:294 alltraps_kern(6,0,ffffffffffffffff,0,9,ffff8000210a2270) at alltraps_kern+0x7b ptsignal(d25,ffff8000210a2270,ffff8000210b6668) at ptsignal+0x115 sys/kern/kern_sig.c:944 mi_switch() at mi_switch+0x1fb sys/kern/sched_bsd.c:392 sleep_finish(1,ffff80002119f810) at sleep_finish+0xd3 sys/kern/kern_synch.c:312 sleep_finish_all(ffff80002119f810,32) at sleep_finish_all+0x22 sleep_finish_timeout sys/kern/kern_synch.c:336 [inline] sleep_finish_all(ffff80002119f810,32) at sleep_finish_all+0x22 sys/kern/kern_synch.c:157 tsleep(ffff8000210b6668,ffff8000210a2270,ffffffff81511f74,ffff8000210b6688) at tsleep+0x142 exit1(ffff8000210a2270,0,ffffffff81511f74) at exit1+0x17b sys/kern/kern_exit.c:166 single_thread_check(80000,ffff8000210a2270) at single_thread_check+0xd6 sys/kern/kern_sig.c:1937 userret(0) at userret+0x180 sys/kern/kern_sig.c:1906 intr_user_exit(0,0,0,0,6f7782581b8,1fda9) at intr_user_exit+0x3c end of kernel end trace frame: 0x7f7ffffe3b00, count: -16 ddb{0}> show registers rdi 0xffffffff81e1a970 kprintf_mutex rsi 0x5 rbp 0xffff80002119f4e0 rbx 0xffff80002119f580 rdx 0x3fd rcx 0 rax 0 r8 0xffff80002119f4b0 r9 0x8080808080808080 r10 0x7cc7359a78ce1d93 r11 0xffffffff811340d0 x86_bus_space_io_read_1 r12 0x3000000008 r13 0xffff80002119f4f0 r14 0x100 r15 0xffffffff81bf1b93 cmd0646_9_tim_udma+0x1a347 rip 0xffffffff81796cba db_enter+0xa cs 0x8 rflags 0x246 rsp 0xffff80002119f4e0 ss 0x10 db_enter+0xa: popq %rbp ddb{0}> show proc PROC (syz-executor0) pid=301854 stat=sleep flags process=1010 proc=82000 pri=50, usrpri=86, nice=20 forw=0x0, list=0xffff8000210a3080,0xffff8000210a2028 process=0xffff8000210b6668 user=0xffff80002119a000, vmspace=0xffffff00657d8b60 estcpu=36, cpticks=11, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 6307 238645 64685 65534 2 0x10 syz-executor1 6307 335054 64685 65534 3 0x4000090 ttyout syz-executor1 6307 462737 64685 65534 2 0x4000010 syz-executor1 47662 507150 20627 65534 2 0x4081010 syz-executor0 47662 218801 20627 65534 3 0x4003010 suspend syz-executor0 20627 331736 14658 65534 3 0x90 nanosleep syz-executor0 14658 418439 88157 0 3 0x82 wait syz-executor0 64685 201854 53628 65534 3 0x90 nanosleep syz-executor1 53628 177101 88157 0 3 0x82 wait syz-executor1 52299 324915 0 0 3 0x14200 bored sosplice 88157 520305 95492 0 3 0x82 kqread syz-fuzzer 88157 382630 95492 0 3 0x4000082 thrsleep syz-fuzzer 88157 243142 95492 0 3 0x4000082 thrsleep syz-fuzzer 88157 274871 95492 0 3 0x4000082 thrsleep syz-fuzzer 88157 174080 95492 0 3 0x4000082 thrsleep syz-fuzzer 88157 344743 95492 0 3 0x4000082 thrsleep syz-fuzzer 88157 517978 95492 0 3 0x4000082 thrsleep syz-fuzzer 88157 465720 95492 0 3 0x4000082 thrsleep syz-fuzzer 88157 95815 95492 0 3 0x4000082 thrsleep syz-fuzzer 88157 187982 95492 0 3 0x4000082 thrsleep syz-fuzzer 95492 435325 91183 0 3 0x10008a pause ksh 91183 231103 2859 0 3 0x92 select sshd 58674 39699 1 0 3 0x100083 ttyin getty 2859 116846 1 0 3 0x80 select sshd 24983 430306 44139 73 3 0x100090 kqread syslogd 44139 434570 1 0 3 0x100082 netio syslogd 33301 428176 1 77 3 0x100090 poll dhclient 84777 107608 1 0 3 0x80 poll dhclient 68267 457786 0 0 2 0x14200 zerothread 95689 500154 0 0 3 0x14200 aiodoned aiodoned 98837 302758 0 0 3 0x14200 syncer update 19716 400277 0 0 3 0x14200 cleaner cleaner 59430 35804 0 0 3 0x14200 reaper reaper 7718 90252 0 0 3 0x14200 pgdaemon pagedaemon 31144 390643 0 0 3 0x14200 bored crynlk 87432 156306 0 0 3 0x14200 bored crypto 84692 66623 0 0 3 0x40014200 acpi0 acpi0 97283 159069 0 0 3 0x40014200 idle1 64935 218923 0 0 3 0x14200 bored softnet 11215 120544 0 0 3 0x14200 bored systqmp 52595 156857 0 0 3 0x14200 bored systq 23015 235946 0 0 3 0x40014200 bored softclock 66255 350355 0 0 3 0x40014200 idle0 1 132751 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper