kernel panic at /syzkaller/managers/main/kernel/kern/include/kref.h:68, from core 3: assertion failed: kref_refcnt(kref) > 0
Stack Backtrace on Core 3:
#01 [<0xffffffffc200a33c>] in backtrace at src/kdebug.c:220
#02 [<0xffffffffc2009b3d>] in _panic at src/init.c:268
#03 [<     [inline]     >] in kref_put at include/kref.h:68
#03 [<0xffffffffc200abab>] in kfree at src/kmalloc.c:236
#04 [<0xffffffffc20313b4>] in kstrdup at src/ns/chan.c:122
#05 [<0xffffffffc201774c>] in Fsprotoclone at src/net/devip.c:1776
#06 [<0xffffffffc2017b48>] in ipopen at src/net/devip.c:499
#07 [<0xffffffffc2033910>] in __namec_from at src/ns/chan.c:1232
#08 [<0xffffffffc20340ef>] in namec at src/ns/chan.c:1516
#09 [<0xffffffffc2041446>] in sysopenat at src/ns/sysfile.c:590
#10 [<0xffffffffc20589af>] in sys_openat at src/syscall.c:1724
#11 [<0xffffffffc2059569>] in syscall at src/syscall.c:2455
#12 [<0xffffffffc2059734>] in run_local_syscall at src/syscall.c:2490
#13 [<0xffffffffc2059c69>] in prep_syscalls at src/syscall.c:2510
#14 [<0xffffffffc20ab5fa>] in sysenter_callwrapper at arch/x86/trap.c:854