[syzbot] [net?] possible deadlock in ipv6_sock_mc_close (2)

syzbot
2024-09-03T13:13:28Z

Hello,

syzbot found the following issue on:

HEAD commit: 43d0035b2c6a Merge branch 'unmask-dscp-bits'
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=10c73b33980000
kernel config: https://syzkaller.appspot.com/x/.config?x=996585887acdadb3
dashboard link: https://syzkaller.appspot.com/bug?extid=34658a0f0144bec77d8d
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d9ee2f9a24bd/disk-43d0035b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/45ba9b6d0285/vmlinux-43d0035b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/23448fef5f65/bzImage-43d0035b.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+34658a0f0144bec77d8d@syzkaller.appspotmail.com

IPVS: stopping backup sync thread 11551 ...
======================================================
WARNING: possible circular locking dependency detected
6.11.0-rc5-syzkaller-00764-g43d0035b2c6a #0 Not tainted
------------------------------------------------------
syz.2.1876/12083 is trying to acquire lock:
ffffffff8fc8c048 (rtnl_mutex){+.+.}-{3:3}, at: ipv6_sock_mc_close+0xc9/0x140 net/ipv6/mcast.c:354

but task is already holding lock:
ffff88805f5ef850 (&smc->clcsock_release_lock){+.+.}-{3:3}, at: smc_setsockopt+0x1c3/0xe50 net/smc/af_smc.c:3056

which lock already depends on the new lock.

the existing dependency chain (in reverse order) is:

-> #2 (&smc->clcsock_release_lock){+.+.}-{3:3}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
smc_switch_to_fallback+0x35/0xdb0 net/smc/af_smc.c:902
smc_sendmsg+0x11f/0x530 net/smc/af_smc.c:2771
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:745
__sys_sendto+0x3a4/0x4f0 net/socket.c:2204
__do_sys_sendto net/socket.c:2216 [inline]
__se_sys_sendto net/socket.c:2212 [inline]
__x64_sys_sendto+0xde/0x100 net/socket.c:2212
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (sk_lock-AF_INET){+.+.}-{0:0}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
lock_sock_nested+0x48/0x100 net/core/sock.c:3543
do_ip_setsockopt+0x1a2d/0x3cd0 net/ipv4/ip_sockglue.c:1078
ip_setsockopt+0x63/0x100 net/ipv4/ip_sockglue.c:1417
do_sock_setsockopt+0x3af/0x720 net/socket.c:2324
__sys_setsockopt+0x1ae/0x250 net/socket.c:2347
__do_sys_setsockopt net/socket.c:2356 [inline]
__se_sys_setsockopt net/socket.c:2353 [inline]
__x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2353
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (rtnl_mutex){+.+.}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3133 [inline]
check_prevs_add kernel/locking/lockdep.c:3252 [inline]
validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3868
__lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5142
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
ipv6_sock_mc_close+0xc9/0x140 net/ipv6/mcast.c:354
inet6_release+0x47/0x70 net/ipv6/af_inet6.c:484
__sock_release net/socket.c:659 [inline]
sock_release+0x82/0x150 net/socket.c:687
stop_sync_thread+0x4e6/0x5e0 net/netfilter/ipvs/ip_vs_sync.c:2004
do_ip_vs_set_ctl+0x47b/0x13d0 net/netfilter/ipvs/ip_vs_ctl.c:2734
nf_setsockopt+0x295/0x2c0 net/netfilter/nf_sockopt.c:101
smc_setsockopt+0x275/0xe50 net/smc/af_smc.c:3064
do_sock_setsockopt+0x3af/0x720 net/socket.c:2324
__sys_setsockopt+0x1ae/0x250 net/socket.c:2347
__do_sys_setsockopt net/socket.c:2356 [inline]
__se_sys_setsockopt net/socket.c:2353 [inline]
__x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2353
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
rtnl_mutex --> sk_lock-AF_INET --> &smc->clcsock_release_lock

Possible unsafe locking scenario:

CPU0 CPU1
---- ----
lock(&smc->clcsock_release_lock);
lock(sk_lock-AF_INET);
lock(&smc->clcsock_release_lock);
lock(rtnl_mutex);

*** DEADLOCK ***

1 lock held by syz.2.1876/12083:
#0: ffff88805f5ef850 (&smc->clcsock_release_lock){+.+.}-{3:3}, at: smc_setsockopt+0x1c3/0xe50 net/smc/af_smc.c:3056

stack backtrace:
CPU: 0 UID: 0 PID: 12083 Comm: syz.2.1876 Not tainted 6.11.0-rc5-syzkaller-00764-g43d0035b2c6a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2186
check_prev_add kernel/locking/lockdep.c:3133 [inline]
check_prevs_add kernel/locking/lockdep.c:3252 [inline]
validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3868
__lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5142
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
ipv6_sock_mc_close+0xc9/0x140 net/ipv6/mcast.c:354
inet6_release+0x47/0x70 net/ipv6/af_inet6.c:484
__sock_release net/socket.c:659 [inline]
sock_release+0x82/0x150 net/socket.c:687
stop_sync_thread+0x4e6/0x5e0 net/netfilter/ipvs/ip_vs_sync.c:2004
do_ip_vs_set_ctl+0x47b/0x13d0 net/netfilter/ipvs/ip_vs_ctl.c:2734
nf_setsockopt+0x295/0x2c0 net/netfilter/nf_sockopt.c:101
smc_setsockopt+0x275/0xe50 net/smc/af_smc.c:3064
do_sock_setsockopt+0x3af/0x720 net/socket.c:2324
__sys_setsockopt+0x1ae/0x250 net/socket.c:2347
__do_sys_setsockopt net/socket.c:2356 [inline]
__se_sys_setsockopt net/socket.c:2353 [inline]
__x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2353
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc693f79eb9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc6939ff038 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007fc694116058 RCX: 00007fc693f79eb9
RDX: 000000000000048c RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007fc693fe793e R08: 0000000000000018 R09: 0000000000000000
R10: 00000000200002c0 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fc694116058 R15: 00007ffcf1815ee8
</TASK>

---
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