WARNING in sta_info_alloc
by syzbot
Hello,
syzbot found the following issue on:
HEAD commit: 549738f1 Linux 5.9-rc8
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15b97ba3900000
kernel config: https://syzkaller.appspot.com/x/.config?x=c06bcf3cc963d91c
dashboard link: https://syzkaller.appspot.com/bug?extid=45d7c243c006f39dc55a
compiler: gcc (GCC) 10.1.0-syz 20200507
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12bae9c0500000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1099b1c0500000
The issue was bisected to:
commit 643c332d519bdfbf80d21f40d1c0aa0ccf3ec1cb
Author: Zi Shen Lim <zlim.lnx(a)gmail.com>
Date: Thu Jun 9 04:18:50 2016 +0000
arm64: bpf: optimize LD_ABS, LD_IND
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11d44477900000
final oops: https://syzkaller.appspot.com/x/report.txt?x=13d44477900000
console output: https://syzkaller.appspot.com/x/log.txt?x=15d44477900000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+45d7c243c006f39dc55a(a)syzkaller.appspotmail.com
Fixes: 643c332d519b ("arm64: bpf: optimize LD_ABS, LD_IND")
------------[ cut here ]------------
WARNING: CPU: 0 PID: 6879 at net/mac80211/ieee80211_i.h:1447 ieee80211_get_sband net/mac80211/ieee80211_i.h:1447 [inline]
WARNING: CPU: 0 PID: 6879 at net/mac80211/ieee80211_i.h:1447 sta_info_alloc+0x1900/0x1f90 net/mac80211/sta_info.c:469
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 6879 Comm: syz-executor071 Not tainted 5.9.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x198/0x1fd lib/dump_stack.c:118
panic+0x382/0x7fb kernel/panic.c:231
__warn.cold+0x20/0x4b kernel/panic.c:600
report_bug+0x1bd/0x210 lib/bug.c:198
handle_bug+0x38/0x90 arch/x86/kernel/traps.c:234
exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:254
asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536
RIP: 0010:ieee80211_get_sband net/mac80211/ieee80211_i.h:1447 [inline]
RIP: 0010:sta_info_alloc+0x1900/0x1f90 net/mac80211/sta_info.c:469
Code: 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 f0 04 00 00 49 8b 9f 60 01 00 00 e9 fc f6 ff ff e8 80 20 b6 f9 <0f> 0b e8 e9 62 66 00 31 ff 89 c3 89 c6 e8 ce 1c b6 f9 85 db 74 1d
RSP: 0018:ffffc9000539f498 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff87c01d61
RDX: ffff8880a91ec3c0 RSI: ffffffff87c01e10 RDI: 0000000000000005
RBP: ffff8880896e0c80 R08: 0000000000000001 R09: ffffffff8d0c29e7
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880896e31b0 R14: dffffc0000000000 R15: ffff888092f06000
ieee80211_add_station+0x28c/0x660 net/mac80211/cfg.c:1586
rdev_add_station net/wireless/rdev-ops.h:190 [inline]
nl80211_new_station+0xde7/0x1440 net/wireless/nl80211.c:6294
genl_family_rcv_msg_doit net/netlink/genetlink.c:669 [inline]
genl_family_rcv_msg net/netlink/genetlink.c:714 [inline]
genl_rcv_msg+0x61d/0x980 net/netlink/genetlink.c:731
netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2470
genl_rcv+0x24/0x40 net/netlink/genetlink.c:742
netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330
netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919
sock_sendmsg_nosec net/socket.c:651 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:671
____sys_sendmsg+0x6e8/0x810 net/socket.c:2353
___sys_sendmsg+0xf3/0x170 net/socket.c:2407
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2440
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x441999
Code: e8 dc 05 03 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b 0d fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd9fa54bf8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441999
RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000005
RBP: 000000306e616c77 R08: 0000000000000000 R09: 0000002000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000032
R13: 0000000000000000 R14: 000000000000000c R15: 0000000000000004
Kernel Offset: disabled
Rebooting in 86400 seconds..
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller(a)googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches
3 months
[PATCH 1/2] vxlan: Add needed_headroom for lower device
by Sven Eckelmann
It was observed that sending data via batadv over vxlan (on top of
wireguard) reduced the performance massively compared to raw ethernet or
batadv on raw ethernet. A check of perf data showed that the
vxlan_build_skb was calling all the time pskb_expand_head to allocate
enough headroom for:
min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
+ VXLAN_HLEN + iphdr_len;
But the vxlan_config_apply only requested needed headroom for:
lowerdev->hard_header_len + VXLAN6_HEADROOM or VXLAN_HEADROOM
So it completely ignored the needed_headroom of the lower device. The first
caller of net_dev_xmit could therefore never make sure that enough headroom
was allocated for the rest of the transmit path.
Cc: Annika Wickert <annika.wickert(a)exaring.de>
Signed-off-by: Sven Eckelmann <sven(a)narfation.org>
---
drivers/net/vxlan.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 236fcc55a5fd..25b5b5a2dfea 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -3799,6 +3799,7 @@ static void vxlan_config_apply(struct net_device *dev,
dev->gso_max_segs = lowerdev->gso_max_segs;
needed_headroom = lowerdev->hard_header_len;
+ needed_headroom += lowerdev->needed_headroom;
max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
VXLAN_HEADROOM);
--
2.29.2
10 months, 3 weeks
[PATCH 0/3] pull request for net: batman-adv 2020-11-27
by Simon Wunderlich
Hi David, hi Jakub,
here are some more bugfixes for batman-adv which we would like to have integrated into net.
Please pull or let me know of any problem!
Thank you,
Simon
The following changes since commit 14a2e551faea53d45bc11629a9dac88f88950ca7:
batman-adv: set .owner to THIS_MODULE (2020-11-15 11:43:56 +0100)
are available in the Git repository at:
git://git.open-mesh.org/linux-merge.git tags/batadv-net-pullrequest-20201127
for you to fetch changes up to 992b03b88e36254e26e9a4977ab948683e21bd9f:
batman-adv: Don't always reallocate the fragmentation skb head (2020-11-27 08:02:55 +0100)
----------------------------------------------------------------
Here are some batman-adv bugfixes:
- Fix head/tailroom issues for fragments, by Sven Eckelmann (3 patches)
----------------------------------------------------------------
Sven Eckelmann (3):
batman-adv: Consider fragmentation for needed_headroom
batman-adv: Reserve needed_*room for fragments
batman-adv: Don't always reallocate the fragmentation skb head
net/batman-adv/fragmentation.c | 26 ++++++++++++++++----------
net/batman-adv/hard-interface.c | 3 +++
2 files changed, 19 insertions(+), 10 deletions(-)
10 months, 3 weeks
[PATCH] batman-adv: Consider fragmentation for needed_headroom
by Sven Eckelmann
If a batman-adv packets has to be fragmented, then the original batman-adv
packet header is not stripped away. Instead, only a new header is added in
front of the packet after it was splitted.
This size must be considered to avoid cost intensive reallocations during
the transmission through the various device layers.
Reported-by: Linus Lüssing <linus.luessing(a)c0d3.blue>
Signed-off-by: Sven Eckelmann <sven(a)narfation.org>
---
net/batman-adv/hard-interface.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index f122e448..bbedb9a4 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -553,6 +553,9 @@ static void batadv_hardif_recalc_extra_skbroom(struct net_device *soft_iface)
needed_headroom = lower_headroom + (lower_header_len - ETH_HLEN);
needed_headroom += batadv_max_header_len();
+ /* fragmentation headers don't strip the unicast/... header */
+ needed_headroom += sizeof(struct batadv_frag_packet);
+
soft_iface->needed_headroom = needed_headroom;
soft_iface->needed_tailroom = lower_tailroom;
}
--
2.29.2
10 months, 3 weeks
[PATCH] batman-adv: Don't always reallocate the fragmentation skb head
by Sven Eckelmann
When a packet is fragmented by batman-adv, the original batman-adv header
is not modified. Only a new fragmentation is inserted between the original
one and the ethernet header. The code must therefore make sure that it has
a writable region of this size in the skbuff head.
But it is not useful to always reallocate the skbuff by this size even when
there would be more than enough headroom still in the skb. The reallocation
is just to costly during in this codepath.
Signed-off-by: Sven Eckelmann <sven(a)narfation.org>
---
net/batman-adv/fragmentation.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/net/batman-adv/fragmentation.c b/net/batman-adv/fragmentation.c
index 8a73804d..59ebd731 100644
--- a/net/batman-adv/fragmentation.c
+++ b/net/batman-adv/fragmentation.c
@@ -527,13 +527,14 @@ int batadv_frag_send_packet(struct sk_buff *skb,
frag_header.no++;
}
- /* Make room for the fragment header. */
- if (batadv_skb_head_push(skb, header_size) < 0 ||
- pskb_expand_head(skb, header_size + ETH_HLEN, 0, GFP_ATOMIC) < 0) {
- ret = -ENOMEM;
+ /* make sure that there is at least enough head for the fragmentation
+ * and ethernet headers
+ */
+ ret = skb_cow_head(skb, ETH_HLEN + header_size);
+ if (ret < 0)
goto put_primary_if;
- }
+ skb_push(skb, header_size);
memcpy(skb->data, &frag_header, header_size);
/* Send the last fragment */
--
2.29.2
10 months, 3 weeks
[PATCH] batman-adv: Reserve needed_*room for fragments
by Sven Eckelmann
The batadv net_device is trying to propagate the needed_headroom and
needed_tailroom from the lower devices. This is needed to avoid cost
intensive reallocations using pskb_expand_head during the transmission.
But the fragmentation code splitted the skb's without adding extra room at
the end/beginning of the various fragments. This reduced the performance of
transmissions over complex scenarios (batadv on vxlan on wireguard) because
the lower devices had to perform the reallocations at least once.
Signed-off-by: Sven Eckelmann <sven(a)narfation.org>
---
v1:
- added commit message
- added tailroom
net/batman-adv/fragmentation.c | 15 ++++++++++-----
1 file changed, 10 insertions(+), 5 deletions(-)
diff --git a/net/batman-adv/fragmentation.c b/net/batman-adv/fragmentation.c
index 97220e19..8a73804d 100644
--- a/net/batman-adv/fragmentation.c
+++ b/net/batman-adv/fragmentation.c
@@ -391,6 +391,7 @@ bool batadv_frag_skb_fwd(struct sk_buff *skb,
/**
* batadv_frag_create() - create a fragment from skb
+ * @net_dev: outgoing device for fragment
* @skb: skb to create fragment from
* @frag_head: header to use in new fragment
* @fragment_size: size of new fragment
@@ -401,22 +402,25 @@ bool batadv_frag_skb_fwd(struct sk_buff *skb,
*
* Return: the new fragment, NULL on error.
*/
-static struct sk_buff *batadv_frag_create(struct sk_buff *skb,
+static struct sk_buff *batadv_frag_create(struct net_device *net_dev,
+ struct sk_buff *skb,
struct batadv_frag_packet *frag_head,
unsigned int fragment_size)
{
+ unsigned int ll_reserved = LL_RESERVED_SPACE(net_dev);
+ unsigned int tailroom = net_dev->needed_tailroom;
struct sk_buff *skb_fragment;
unsigned int header_size = sizeof(*frag_head);
unsigned int mtu = fragment_size + header_size;
- skb_fragment = netdev_alloc_skb(NULL, mtu + ETH_HLEN);
+ skb_fragment = dev_alloc_skb(ll_reserved + mtu + tailroom);
if (!skb_fragment)
goto err;
skb_fragment->priority = skb->priority;
/* Eat the last mtu-bytes of the skb */
- skb_reserve(skb_fragment, header_size + ETH_HLEN);
+ skb_reserve(skb_fragment, ll_reserved + header_size);
skb_split(skb, skb_fragment, skb->len - fragment_size);
/* Add the header */
@@ -439,11 +443,12 @@ int batadv_frag_send_packet(struct sk_buff *skb,
struct batadv_orig_node *orig_node,
struct batadv_neigh_node *neigh_node)
{
+ struct net_device *net_dev = neigh_node->if_incoming->net_dev;
struct batadv_priv *bat_priv;
struct batadv_hard_iface *primary_if = NULL;
struct batadv_frag_packet frag_header;
struct sk_buff *skb_fragment;
- unsigned int mtu = neigh_node->if_incoming->net_dev->mtu;
+ unsigned int mtu = net_dev->mtu;
unsigned int header_size = sizeof(frag_header);
unsigned int max_fragment_size, num_fragments;
int ret;
@@ -503,7 +508,7 @@ int batadv_frag_send_packet(struct sk_buff *skb,
goto put_primary_if;
}
- skb_fragment = batadv_frag_create(skb, &frag_header,
+ skb_fragment = batadv_frag_create(net_dev, skb, &frag_header,
max_fragment_size);
if (!skb_fragment) {
ret = -ENOMEM;
--
2.29.2
10 months, 3 weeks
[RFC PATCH] batman-adv: Reserve needed_headroom for fragments
by Sven Eckelmann
TODO: write something about the extra headroom vxlan needs and why it
reduced the performance significantly when only using the minimum reserved
space.
Cc: Annika Wickert <annika.wickert(a)exaring.de>
Signed-off-by: Sven Eckelmann <sven(a)narfation.org>
---
net/batman-adv/fragmentation.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/net/batman-adv/fragmentation.c b/net/batman-adv/fragmentation.c
index 97220e19..5039b201 100644
--- a/net/batman-adv/fragmentation.c
+++ b/net/batman-adv/fragmentation.c
@@ -391,6 +391,7 @@ bool batadv_frag_skb_fwd(struct sk_buff *skb,
/**
* batadv_frag_create() - create a fragment from skb
+ * @net_dev: outgoing device for fragment
* @skb: skb to create fragment from
* @frag_head: header to use in new fragment
* @fragment_size: size of new fragment
@@ -401,22 +402,24 @@ bool batadv_frag_skb_fwd(struct sk_buff *skb,
*
* Return: the new fragment, NULL on error.
*/
-static struct sk_buff *batadv_frag_create(struct sk_buff *skb,
+static struct sk_buff *batadv_frag_create(struct net_device *net_dev,
+ struct sk_buff *skb,
struct batadv_frag_packet *frag_head,
unsigned int fragment_size)
{
struct sk_buff *skb_fragment;
unsigned int header_size = sizeof(*frag_head);
unsigned int mtu = fragment_size + header_size;
+ int ll_reserved = LL_RESERVED_SPACE(net_dev);
- skb_fragment = netdev_alloc_skb(NULL, mtu + ETH_HLEN);
+ skb_fragment = dev_alloc_skb(ll_reserved + mtu);
if (!skb_fragment)
goto err;
skb_fragment->priority = skb->priority;
/* Eat the last mtu-bytes of the skb */
- skb_reserve(skb_fragment, header_size + ETH_HLEN);
+ skb_reserve(skb_fragment, ll_reserved + header_size);
skb_split(skb, skb_fragment, skb->len - fragment_size);
/* Add the header */
@@ -439,11 +442,12 @@ int batadv_frag_send_packet(struct sk_buff *skb,
struct batadv_orig_node *orig_node,
struct batadv_neigh_node *neigh_node)
{
+ struct net_device *net_dev = neigh_node->if_incoming->net_dev;
struct batadv_priv *bat_priv;
struct batadv_hard_iface *primary_if = NULL;
struct batadv_frag_packet frag_header;
struct sk_buff *skb_fragment;
- unsigned int mtu = neigh_node->if_incoming->net_dev->mtu;
+ unsigned int mtu = net_dev->mtu;
unsigned int header_size = sizeof(frag_header);
unsigned int max_fragment_size, num_fragments;
int ret;
@@ -503,7 +507,7 @@ int batadv_frag_send_packet(struct sk_buff *skb,
goto put_primary_if;
}
- skb_fragment = batadv_frag_create(skb, &frag_header,
+ skb_fragment = batadv_frag_create(net_dev, skb, &frag_header,
max_fragment_size);
if (!skb_fragment) {
ret = -ENOMEM;
--
2.29.2
10 months, 4 weeks
[PATCH 0/1] pull request for net: batman-adv 2020-11-24
by Simon Wunderlich
Hi David, hi Jakub,
here is a bugfix for batman-adv which we would like to have integrated into net.
Please pull or let me know of any problem!
Thank you,
Simon
The following changes since commit f8394f232b1eab649ce2df5c5f15b0e528c92091:
Linux 5.10-rc3 (2020-11-08 16:10:16 -0800)
are available in the Git repository at:
git://git.open-mesh.org/linux-merge.git tags/batadv-net-pullrequest-20201124
for you to fetch changes up to 14a2e551faea53d45bc11629a9dac88f88950ca7:
batman-adv: set .owner to THIS_MODULE (2020-11-15 11:43:56 +0100)
----------------------------------------------------------------
Here is a batman-adv bugfix:
- set module owner to THIS_MODULE, by Taehee Yoo
----------------------------------------------------------------
Taehee Yoo (1):
batman-adv: set .owner to THIS_MODULE
net/batman-adv/log.c | 1 +
1 file changed, 1 insertion(+)
10 months, 4 weeks
INFO: task hung in sync_inodes_sb (4)
by syzbot
Hello,
syzbot found the following issue on:
HEAD commit: 03430750 Add linux-next specific files for 20201116
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=17027fdc500000
kernel config: https://syzkaller.appspot.com/x/.config?x=a1c4c3f27041fdb8
dashboard link: https://syzkaller.appspot.com/bug?extid=7d50f1e54a12ba3aeae2
compiler: gcc (GCC) 10.1.0-syz 20200507
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=124a8841500000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15a4fce2500000
The issue was bisected to:
commit c68df2e7be0c1238ea3c281fd744a204ef3b15a0
Author: Emmanuel Grumbach <emmanuel.grumbach(a)intel.com>
Date: Thu Sep 15 13:30:02 2016 +0000
mac80211: allow using AP_LINK_PS with mac80211-generated TIM IE
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1445e981500000
final oops: https://syzkaller.appspot.com/x/report.txt?x=1645e981500000
console output: https://syzkaller.appspot.com/x/log.txt?x=1245e981500000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7d50f1e54a12ba3aeae2(a)syzkaller.appspotmail.com
Fixes: c68df2e7be0c ("mac80211: allow using AP_LINK_PS with mac80211-generated TIM IE")
INFO: task syz-executor017:8513 blocked for more than 143 seconds.
Not tainted 5.10.0-rc3-next-20201116-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor017 state:D stack:27448 pid: 8513 ppid: 8507 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4269 [inline]
__schedule+0x890/0x2030 kernel/sched/core.c:5019
schedule+0xcf/0x270 kernel/sched/core.c:5098
wb_wait_for_completion+0x17b/0x230 fs/fs-writeback.c:209
sync_inodes_sb+0x1a6/0x9d0 fs/fs-writeback.c:2559
__sync_filesystem fs/sync.c:34 [inline]
sync_filesystem fs/sync.c:67 [inline]
sync_filesystem+0x15c/0x260 fs/sync.c:48
generic_shutdown_super+0x70/0x370 fs/super.c:448
kill_block_super+0x97/0xf0 fs/super.c:1446
deactivate_locked_super+0x94/0x160 fs/super.c:335
deactivate_super+0xad/0xd0 fs/super.c:366
cleanup_mnt+0x3a3/0x530 fs/namespace.c:1123
task_work_run+0xdd/0x190 kernel/task_work.c:140
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
exit_to_user_mode_prepare+0x1f0/0x200 kernel/entry/common.c:199
syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:274
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x44e0e7
Code: Unable to access opcode bytes at RIP 0x44e0bd.
RSP: 002b:00007fff42061288 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00000000000cee4c RCX: 000000000044e0e7
RDX: 0000000000400be0 RSI: 0000000000000002 RDI: 00007fff42061330
RBP: 0000000000002142 R08: 0000000000000000 R09: 0000000000000009
R10: 0000000000000005 R11: 0000000000000206 R12: 00007fff420623e0
R13: 0000000001f67880 R14: 0000000000000000 R15: 0000000000000000
Showing all locks held in the system:
2 locks held by kworker/u4:5/225:
#0: ffff8881413a4138 ((wq_completion)writeback){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff8881413a4138 ((wq_completion)writeback){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
#0: ffff8881413a4138 ((wq_completion)writeback){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
#0: ffff8881413a4138 ((wq_completion)writeback){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
#0: ffff8881413a4138 ((wq_completion)writeback){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
#0: ffff8881413a4138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 kernel/workqueue.c:2243
#1: ffffc9000191fda8 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 kernel/workqueue.c:2247
1 lock held by khungtaskd/1655:
#0: ffffffff8b339ce0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6252
1 lock held by in:imklog/8188:
#0: ffff888017c8f4f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:932
2 locks held by syz-executor017/8513:
#0: ffff88801a8500e0 (&type->s_umount_key#49){+.+.}-{3:3}, at: deactivate_super+0xa5/0xd0 fs/super.c:365
#1: ffff888143f5e708 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:344 [inline]
#1: ffff888143f5e708 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x18c/0x9d0 fs/fs-writeback.c:2557
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 1655 Comm: khungtaskd Not tainted 5.10.0-rc3-next-20201116-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:79 [inline]
dump_stack+0x107/0x163 lib/dump_stack.c:120
nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline]
watchdog+0xd89/0xf30 kernel/hung_task.c:338
kthread+0x3af/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt drivers/acpi/processor_idle.c:111 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_idle_do_entry+0x1c9/0x250 drivers/acpi/processor_idle.c:517
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller(a)googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches
11 months
[PATCH v3 net] batman-adv: set .owner to THIS_MODULE
by Taehee Yoo
If THIS_MODULE is not set, the module would be removed while debugfs is
being used.
It eventually makes kernel panic.
Fixes: 9e466250ede3 ("batman-adv: Prefix bat_debugfs local static functions with batadv_")
Signed-off-by: Taehee Yoo <ap420073(a)gmail.com>
---
v3:
- Separate from one big series
v2:
- Change headline
- Squash patches into per-driver/subsystem
net/batman-adv/log.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/net/batman-adv/log.c b/net/batman-adv/log.c
index a67b2b091447..c0ca5fbe5b08 100644
--- a/net/batman-adv/log.c
+++ b/net/batman-adv/log.c
@@ -180,6 +180,7 @@ static const struct file_operations batadv_log_fops = {
.read = batadv_log_read,
.poll = batadv_log_poll,
.llseek = no_llseek,
+ .owner = THIS_MODULE,
};
/**
--
2.17.1
11 months, 1 week
