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:229
#02 [<0xffffffffc2009acd>] in _panic at src/init.c:267
#03 [<0xffffffffc20312bb>] in kref_put at include/kref.h:68
#04 [<0xffffffffc2031978>] in cclose at src/ns/chan.c:334
#05 [<0xffffffffc2036f6a>] in devwalk at src/ns/dev.c:222
#06 [<0xffffffffc2083d6f>] in randomwalk at drivers/dev/random.c:131
#07 [<0xffffffffc2032aed>] in walk at src/ns/chan.c:809
#08 [<0xffffffffc2033559>] in __namec_from at src/ns/chan.c:1139
#09 [<0xffffffffc203413f>] in namec at src/ns/chan.c:1517
#10 [<0xffffffffc20414b6>] in sysopenat at src/ns/sysfile.c:592
#11 [<0xffffffffc205934f>] in sys_openat at src/syscall.c:1724
#12 [<0xffffffffc2059f09>] in syscall at src/syscall.c:2465
#13 [<0xffffffffc205a0d4>] in run_local_syscall at src/syscall.c:2500
#14 [<0xffffffffc205a609>] in prep_syscalls at src/syscall.c:2520
#15 [<0xffffffffc20abc0a>] 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 [<0xffffffffc200a33c>] in backtrace at src/kdebug.c:229
#02 [<0xffffffffc2009acd>] in _panic at src/init.c:267
#03 [<0xffffffffc203199a>] in cclose at src/ns/chan.c:332
#04 [<0xffffffffc2033379>] in walk_symlink at src/ns/chan.c:1703
#05 [<0xffffffffc2033364>] in walk_symlink at src/ns/chan.c:1701
#06 [<0xffffffffc2033364>] in walk_symlink at src/ns/chan.c:1701
#07 [<0xffffffffc2033364>] in walk_symlink at src/ns/chan.c:1701
#08 [<0xffffffffc2033364>] in walk_symlink at src/ns/chan.c:1701
#09 [<0xffffffffc2033364>] in walk_symlink at src/ns/chan.c:1701
#10 [<0xffffffffc2032e82>] in walk at src/ns/chan.c:872
#11 [<0xffffffffc2033559>] in __namec_from at src/ns/chan.c:1139
#12 [<0xffffffffc203413f>] in namec at src/ns/chan.c:1517
#13 [<0xffffffffc203de65>] in sysremove at src/ns/sysfile.c:841
#14 [<0xffffffffc20561e5>] in sys_rmdir at src/syscall.c:2070
#15 [<0xffffffffc2059f09>] in syscall at src/syscall.c:2465
#16 [<0xffffffffc205a0d4>] in run_local_syscall at src/syscall.c:2500
#17 [<0xffffffffc205a609>] in prep_syscalls at src/syscall.c:2520
#18 [<0xffffffffc20abc0a>] in sysenter_callwrapper at arch/x86/trap.c:854
[kernel] Unknown mbox type -2001488597!