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Message-ID: <0000000000001d8e2c05bc79e2fd@google.com>
Date: Mon, 01 Mar 2021 05:49:14 -0800
From: syzbot <syzbot+e2fa57709a385e6db10f@...kaller.appspotmail.com>
To: bfields@...ldses.org, chuck.lever@...cle.com, davem@...emloft.net,
dsahern@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org,
linux-nfs@...r.kernel.org, netdev@...r.kernel.org,
syzkaller-bugs@...glegroups.com, yoshfuji@...ux-ipv6.org
Subject: possible deadlock in ipv6_sock_mc_close
Hello,
syzbot found the following issue on:
HEAD commit: eee7ede6 Merge branch 'bnxt_en-error-recovery-bug-fixes'
git tree: net
console output: https://syzkaller.appspot.com/x/log.txt?x=123ad632d00000
kernel config: https://syzkaller.appspot.com/x/.config?x=e2d5ba72abae4f14
dashboard link: https://syzkaller.appspot.com/bug?extid=e2fa57709a385e6db10f
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=109d89b6d00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12e9e0dad00000
The issue was bisected to:
commit c8e88e3aa73889421461f878cd569ef84f231ceb
Author: Chuck Lever <chuck.lever@...cle.com>
Date: Tue Nov 3 20:06:04 2020 +0000
NFSD: Replace READ* macros in nfsd4_decode_layoutget()
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13bef9ccd00000
final oops: https://syzkaller.appspot.com/x/report.txt?x=107ef9ccd00000
console output: https://syzkaller.appspot.com/x/log.txt?x=17bef9ccd00000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e2fa57709a385e6db10f@...kaller.appspotmail.com
Fixes: c8e88e3aa738 ("NFSD: Replace READ* macros in nfsd4_decode_layoutget()")
======================================================
WARNING: possible circular locking dependency detected
5.11.0-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor905/8822 is trying to acquire lock:
ffffffff8d678fe8 (rtnl_mutex){+.+.}-{3:3}, at: ipv6_sock_mc_close+0xd7/0x110 net/ipv6/mcast.c:323
but task is already holding lock:
ffff888024390120 (sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1600 [inline]
ffff888024390120 (sk_lock-AF_INET6){+.+.}-{0:0}, at: mptcp6_release+0x57/0x130 net/mptcp/protocol.c:3507
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (sk_lock-AF_INET6){+.+.}-{0:0}:
lock_sock_nested+0xca/0x120 net/core/sock.c:3071
lock_sock include/net/sock.h:1600 [inline]
gtp_encap_enable_socket+0x277/0x4a0 drivers/net/gtp.c:824
gtp_encap_enable drivers/net/gtp.c:855 [inline]
gtp_newlink+0x2b3/0xc60 drivers/net/gtp.c:683
__rtnl_newlink+0x1059/0x1710 net/core/rtnetlink.c:3443
rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3491
rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5553
netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2502
netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338
netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927
sock_sendmsg_nosec net/socket.c:654 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:674
____sys_sendmsg+0x6e8/0x810 net/socket.c:2350
___sys_sendmsg+0xf3/0x170 net/socket.c:2404
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2437
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xae
-> #0 (rtnl_mutex){+.+.}-{3:3}:
check_prev_add kernel/locking/lockdep.c:2936 [inline]
check_prevs_add kernel/locking/lockdep.c:3059 [inline]
validate_chain kernel/locking/lockdep.c:3674 [inline]
__lock_acquire+0x2b14/0x54c0 kernel/locking/lockdep.c:4900
lock_acquire kernel/locking/lockdep.c:5510 [inline]
lock_acquire+0x1ab/0x730 kernel/locking/lockdep.c:5475
__mutex_lock_common kernel/locking/mutex.c:946 [inline]
__mutex_lock+0x139/0x1120 kernel/locking/mutex.c:1093
ipv6_sock_mc_close+0xd7/0x110 net/ipv6/mcast.c:323
mptcp6_release+0xb9/0x130 net/mptcp/protocol.c:3515
__sock_release+0xcd/0x280 net/socket.c:599
sock_close+0x18/0x20 net/socket.c:1258
__fput+0x288/0x920 fs/file_table.c:280
task_work_run+0xdd/0x1a0 kernel/task_work.c:140
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:301
entry_SYSCALL_64_after_hwframe+0x44/0xae
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(sk_lock-AF_INET6);
lock(rtnl_mutex);
lock(sk_lock-AF_INET6);
lock(rtnl_mutex);
*** DEADLOCK ***
2 locks held by syz-executor905/8822:
#0: ffff888033080750 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline]
#0: ffff888033080750 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: __sock_release+0x86/0x280 net/socket.c:598
#1: ffff888024390120 (sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1600 [inline]
#1: ffff888024390120 (sk_lock-AF_INET6){+.+.}-{0:0}, at: mptcp6_release+0x57/0x130 net/mptcp/protocol.c:3507
stack backtrace:
CPU: 1 PID: 8822 Comm: syz-executor905 Not tainted 5.11.0-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+0xfa/0x151 lib/dump_stack.c:120
check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2127
check_prev_add kernel/locking/lockdep.c:2936 [inline]
check_prevs_add kernel/locking/lockdep.c:3059 [inline]
validate_chain kernel/locking/lockdep.c:3674 [inline]
__lock_acquire+0x2b14/0x54c0 kernel/locking/lockdep.c:4900
lock_acquire kernel/locking/lockdep.c:5510 [inline]
lock_acquire+0x1ab/0x730 kernel/locking/lockdep.c:5475
__mutex_lock_common kernel/locking/mutex.c:946 [inline]
__mutex_lock+0x139/0x1120 kernel/locking/mutex.c:1093
ipv6_sock_mc_close+0xd7/0x110 net/ipv6/mcast.c:323
mptcp6_release+0xb9/0x130 net/mptcp/protocol.c:3515
__sock_release+0xcd/0x280 net/socket.c:599
sock_close+0x18/0x20 net/socket.c:1258
__fput+0x288/0x920 fs/file_table.c:280
task_work_run+0xdd/0x1a0 kernel/task_work.c:140
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:301
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x405b73
Code: c7 c2 c0 ff ff ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8
RSP: 002b:00007ffdbac4d208 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000405b73
RDX: 000000000000002a RSI: 0000000000000029 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000088 R09: 0000000000f0b5ff
R10: 00000000200001c0 R11: 0000000000000246 R12: 0000000000010bda
R13: 00007ffdbac4d230 R14: 00007ffdbac4d220 R15: 00007ffdbac4d214
---
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@...glegroups.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
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