https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258421
Bug ID: 258421
Summary: panic when smbiodX exits
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Some of the time, when an smbiod kernel thread exits due to
an unmount or an error on the server connection, the kernel
panics.
# uname -a
FreeBSD xxx 14.0-CURRENT FreeBSD 14.0-CURRENT #0 main-n248636-d20e9e02db3: Thu
Aug 12 05:47:18 UTC 2021
[email protected]:/usr/obj/usr/src/amd64.amd64/sys/GENERIC amd64
# mount_smbfs -I 10.0.0.115 -N -W XXX //guest@samba/test /mnt
# umount /mnt
panic: Assertion stp->st_flags == 0 failed at
/usr/src/sys/kern/sys_generic.c:2027
cpuid = 1
time = 1631309875
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe009bb2a9d0
vpanic() at vpanic+0x187/frame 0xfffffe009bb2aa30
panic() at panic+0x43/frame 0xfffffe009bb2aa90
seltdfini() at seltdfini+0xa0/frame 0xfffffe009bb2aab0
exit1() at exit1+0x492/frame 0xfffffe009bb2ab20
kproc_exit() at kproc_exit+0xaa/frame 0xfffffe009bb2ab50
smb_iod_thread() at smb_iod_thread+0x383/frame 0xfffffe009bb2abb0
fork_exit() at fork_exit+0x80/frame 0xfffffe009bb2abf0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe009bb2abf0
I suspect the problem is that selsocket() in kern/sys_generic.c
can return without calling seltdclear():
seltdinit(td);
for (;;) {
selfdalloc(td, NULL);
error = sopoll(so, events, NULL, td);
if (error) {
/**** need seltdclear(td) here? ****/
return (0);
}
error = seltdwait(td, asbt, precision);
if (error)
break;
}
seltdclear(td);
Another way to provoke the panic is to have the server run samba
but not support an early enough protocol, i.e. to omit the
server min protocol = LANMAN1
from smb4.conf. Then (when I try it) the panic occurs during
the execution of mount_smbfs.
--
You are receiving this mail because:
You are the assignee for the bug.
