kernel panic at /syzkaller/managers/main/kernel/kern/include/kref.h:68, from core 1: assertion failed: kref_refcnt(kref) > 0
Stack Backtrace on Core 1:
#01 [<0xffffffffc200a38c>] in backtrace at src/kdebug.c:229
#02 [<0xffffffffc2009b25>] in _panic at src/init.c:267
#03 [<0xffffffffc203115b>] in kref_put at include/kref.h:68
#04 [<0xffffffffc2031828>] in cclose at src/ns/chan.c:334
#05 [<0xffffffffc20321ba>] in cunique.part.9 at src/ns/chan.c:353
#06 [<     [inline]     >] in cunique at src/ns/chan.c:351
#06 [<0xffffffffc2032dd6>] in walk at src/ns/chan.c:909
#07 [<0xffffffffc2033429>] in __namec_from at src/ns/chan.c:1139
#08 [<0xffffffffc2034013>] in namec at src/ns/chan.c:1517
#09 [<0xffffffffc20413e6>] in sysopenat at src/ns/sysfile.c:592
#10 [<0xffffffffc205940f>] in sys_openat at src/syscall.c:1724
#11 [<0xffffffffc205a019>] in syscall at src/syscall.c:2465
#12 [<0xffffffffc205a1f8>] in run_local_syscall at src/syscall.c:2500
#13 [<0xffffffffc205a739>] in prep_syscalls at src/syscall.c:2520
#14 [<0xffffffffc20abee2>] in sysenter_callwrapper at arch/x86/trap.c:854
kernel panic at kern/src/ns/chan.c:332, from core 2: cclose 0x0000000000000000
Stack Backtrace on Core 2:
#01 [<0xffffffffc200a38c>] in backtrace at src/kdebug.c:229
#02 [<0xffffffffc2009b25>] in _panic at src/init.c:267
#03 [<0xffffffffc203184a>] in cclose at src/ns/chan.c:332
#04 [<0xffffffffc2033251>] in walk_symlink at src/ns/chan.c:1703
#05 [<0xffffffffc203323c>] in walk_symlink at src/ns/chan.c:1701
#06 [<0xffffffffc203323c>] in walk_symlink at src/ns/chan.c:1701
#07 [<0xffffffffc203323c>] in walk_symlink at src/ns/chan.c:1701
#08 [<0xffffffffc203323c>] in walk_symlink at src/ns/chan.c:1701
#09 [<0xffffffffc203323c>] in walk_symlink at src/ns/chan.c:1701
#10 [<0xffffffffc2032d52>] in walk at src/ns/chan.c:872
#11 [<0xffffffffc2033429>] in __namec_from at src/ns/chan.c:1139
#12 [<0xffffffffc2034013>] in namec at src/ns/chan.c:1517
#13 [<0xffffffffc203d92d>] in sysunmount at src/ns/sysfile.c:561
#14 [<0xffffffffc20565dd>] in sys_nunmount at src/syscall.c:2226
#15 [<0xffffffffc205a019>] in syscall at src/syscall.c:2465
#16 [<0xffffffffc205a1f8>] in run_local_syscall at src/syscall.c:2500
#17 [<0xffffffffc205a739>] in prep_syscalls at src/syscall.c:2520
#18 [<0xffffffffc20abee2>] in sysenter_callwrapper at arch/x86/trap.c:854