From: Taehee Yoo ap420073@gmail.com
[ Upstream commit 84bb59d773853bc2dda2ac1ef8474c40eb33a3c6 ]
When hsr module is being removed, debugfs_remove() is called to remove both debugfs directory and file.
When module is being removed, module state is changed to MODULE_STATE_GOING then exit() is called. At this moment, module couldn't be held so try_module_get() will be failed.
debugfs's open() callback tries to hold the module if .owner is existing. If it fails, warning message is printed.
CPU0 CPU1 delete_module() try_stop_module() hsr_exit() open() <-- WARNING debugfs_remove()
In order to avoid the warning message, this patch makes hsr module does not set .owner. Unsetting .owner is safe because these are protected by inode_lock().
Test commands: #SHELL1 ip link add dummy0 type dummy ip link add dummy1 type dummy while : do ip link add hsr0 type hsr slave1 dummy0 slave2 dummy1 modprobe -rv hsr done
#SHELL2 while : do cat /sys/kernel/debug/hsr0/node_table done
Splat looks like: [ 101.223783][ T1271] ------------[ cut here ]------------ [ 101.230309][ T1271] debugfs file owner did not clean up at exit: node_table [ 101.230380][ T1271] WARNING: CPU: 3 PID: 1271 at fs/debugfs/file.c:309 full_proxy_open+0x10f/0x650 [ 101.233153][ T1271] Modules linked in: hsr(-) dummy veth openvswitch nsh nf_conncount nf_nat nf_conntrack nf_d] [ 101.237112][ T1271] CPU: 3 PID: 1271 Comm: cat Tainted: G W 5.5.0-rc1+ #204 [ 101.238270][ T1271] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006 [ 101.240379][ T1271] RIP: 0010:full_proxy_open+0x10f/0x650 [ 101.241166][ T1271] Code: 48 c1 ea 03 80 3c 02 00 0f 85 c1 04 00 00 49 8b 3c 24 e8 04 86 7e ff 84 c0 75 2d 4c 8 [ 101.251985][ T1271] RSP: 0018:ffff8880ca22fa38 EFLAGS: 00010286 [ 101.273355][ T1271] RAX: dffffc0000000008 RBX: ffff8880cc6e6200 RCX: 0000000000000000 [ 101.274466][ T1271] RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffff8880c4dd5c14 [ 101.275581][ T1271] RBP: 0000000000000000 R08: fffffbfff2922f5d R09: 0000000000000000 [ 101.276733][ T1271] R10: 0000000000000001 R11: 0000000000000000 R12: ffffffffc0551bc0 [ 101.277853][ T1271] R13: ffff8880c4059a48 R14: ffff8880be50a5e0 R15: ffffffff941adaa0 [ 101.278956][ T1271] FS: 00007f8871cda540(0000) GS:ffff8880da800000(0000) knlGS:0000000000000000 [ 101.280216][ T1271] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 101.282832][ T1271] CR2: 00007f88717cfd10 CR3: 00000000b9440005 CR4: 00000000000606e0 [ 101.283974][ T1271] Call Trace: [ 101.285328][ T1271] do_dentry_open+0x63c/0xf50 [ 101.286077][ T1271] ? open_proxy_open+0x270/0x270 [ 101.288271][ T1271] ? __x64_sys_fchdir+0x180/0x180 [ 101.288987][ T1271] ? inode_permission+0x65/0x390 [ 101.289682][ T1271] path_openat+0x701/0x2810 [ 101.290294][ T1271] ? path_lookupat+0x880/0x880 [ 101.290957][ T1271] ? check_chain_key+0x236/0x5d0 [ 101.291676][ T1271] ? __lock_acquire+0xdfe/0x3de0 [ 101.292358][ T1271] ? sched_clock+0x5/0x10 [ 101.292962][ T1271] ? sched_clock_cpu+0x18/0x170 [ 101.293644][ T1271] ? find_held_lock+0x39/0x1d0 [ 101.305616][ T1271] do_filp_open+0x17a/0x270 [ 101.306061][ T1271] ? may_open_dev+0xc0/0xc0 [ ... ]
Fixes: fc4ecaeebd26 ("net: hsr: add debugfs support for display node list") Signed-off-by: Taehee Yoo ap420073@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- net/hsr/hsr_debugfs.c | 1 - 1 file changed, 1 deletion(-)
diff --git a/net/hsr/hsr_debugfs.c b/net/hsr/hsr_debugfs.c index 94447974a3c0..6135706f03d5 100644 --- a/net/hsr/hsr_debugfs.c +++ b/net/hsr/hsr_debugfs.c @@ -64,7 +64,6 @@ hsr_node_table_open(struct inode *inode, struct file *filp) }
static const struct file_operations hsr_fops = { - .owner = THIS_MODULE, .open = hsr_node_table_open, .read = seq_read, .llseek = seq_lseek,