assert "tname->un_flags & UNVEIL_USERSET" failed: file "/syzkaller/managers/multicore/panic: kernel diagnostic assertion

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 13a73e99 Fix a precedence problem.
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=178c440f200000
kernel config: https://syzkaller.appspot.com/x/.config?x=fa145722143cbd64
dashboard link: https://syzkaller.appspot.com/bug?extid=421dae927cf86650841a

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+421dae...@syzkaller.appspotmail.com

panic: kernel diagnostic assertion "tname->un_flags & UNVEIL_USERSET"
failed: file "/syzkaller/managers/multicore/panic: kernel diagnostic
assertion "!_kernel_lock_held()" failed:
file "/syzkaller/managers/multicore/kernel/sys/kern/kern_fork.c", line 689
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
475573 28799 0 0x2004 0x4000000 0 syz-executor.0
*293632 87721 0 0 0x4000000 1 syz-executor.1
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(ffffffff81f7cec5,ffffffff81f6c058,2b1,ffffffff81f4ee5e) at
__assert+0x2e sys/kern/subr_prf.c:155
proc_trampoline_mp() at proc_trampoline_mp+0x13b
end trace frame: 0x0, count: 11
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports. Insufficient info makes it difficult to find and fix bugs.


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[Anton Lindqvist]

#syz dup: assert "tname->un_flags & UNVEIL_USERSET" failed in kern_unveil.c