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Message-ID: <67f08cd7.050a0220.0a13.0228.GAE@google.com>
Date: Fri, 04 Apr 2025 18:52:23 -0700
From: syzbot <syzbot+be6f4b383534d88989f7@...kaller.appspotmail.com>
To: davem@...emloft.net, dsahern@...nel.org, edumazet@...gle.com,
horms@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] possible deadlock in ipv6_sock_ac_close (4)
syzbot has found a reproducer for the following issue on:
HEAD commit: e48e99b6edf4 Merge tag 'pull-fixes' of git://git.kernel.or..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=12afa7cf980000
kernel config: https://syzkaller.appspot.com/x/.config?x=f2054704dd53fb80
dashboard link: https://syzkaller.appspot.com/bug?extid=be6f4b383534d88989f7
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=140a294c580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1486994c580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b03407c4ab24/disk-e48e99b6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/03f6746c0414/vmlinux-e48e99b6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4b3909ad8728/bzImage-e48e99b6.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+be6f4b383534d88989f7@...kaller.appspotmail.com
======================================================
WARNING: possible circular locking dependency detected
6.14.0-syzkaller-13189-ge48e99b6edf4 #0 Not tainted
------------------------------------------------------
syz-executor200/5838 is trying to acquire lock:
ffffffff900fc808 (rtnl_mutex){+.+.}-{4:4}, at: ipv6_sock_ac_close+0xc9/0x130 net/ipv6/anycast.c:220
but task is already holding lock:
ffff888035260aa0 (&smc->clcsock_release_lock){+.+.}-{4:4}, at: smc_clcsock_release+0x82/0xf0 net/smc/smc_close.c:30
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&smc->clcsock_release_lock){+.+.}-{4:4}:
lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
__mutex_lock_common kernel/locking/mutex.c:601 [inline]
__mutex_lock+0x1a5/0x10c0 kernel/locking/mutex.c:746
smc_switch_to_fallback+0x35/0xda0 net/smc/af_smc.c:903
smc_setsockopt+0x765/0xd50 net/smc/af_smc.c:3104
do_sock_setsockopt+0x3b1/0x710 net/socket.c:2296
__sys_setsockopt net/socket.c:2321 [inline]
__do_sys_setsockopt net/socket.c:2327 [inline]
__se_sys_setsockopt net/socket.c:2324 [inline]
__x64_sys_setsockopt+0x1ee/0x280 net/socket.c:2324
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #1 (sk_lock-AF_INET6){+.+.}-{0:0}:
lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
lock_sock_nested+0x48/0x100 net/core/sock.c:3697
do_ipv6_setsockopt+0xccd/0x3680 net/ipv6/ipv6_sockglue.c:567
ipv6_setsockopt+0x5d/0x170 net/ipv6/ipv6_sockglue.c:993
do_sock_setsockopt+0x3b1/0x710 net/socket.c:2296
__sys_setsockopt net/socket.c:2321 [inline]
__do_sys_setsockopt net/socket.c:2327 [inline]
__se_sys_setsockopt net/socket.c:2324 [inline]
__x64_sys_setsockopt+0x1ee/0x280 net/socket.c:2324
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 (rtnl_mutex){+.+.}-{4:4}:
check_prev_add kernel/locking/lockdep.c:3166 [inline]
check_prevs_add kernel/locking/lockdep.c:3285 [inline]
validate_chain+0xa69/0x24e0 kernel/locking/lockdep.c:3909
__lock_acquire+0xad5/0xd80 kernel/locking/lockdep.c:5235
lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
__mutex_lock_common kernel/locking/mutex.c:601 [inline]
__mutex_lock+0x1a5/0x10c0 kernel/locking/mutex.c:746
ipv6_sock_ac_close+0xc9/0x130 net/ipv6/anycast.c:220
inet6_release+0x4f/0x70 net/ipv6/af_inet6.c:485
__sock_release net/socket.c:647 [inline]
sock_release+0x82/0x150 net/socket.c:675
smc_clcsock_release+0xcc/0xf0 net/smc/smc_close.c:34
__smc_release+0x683/0x800 net/smc/af_smc.c:301
smc_release+0x2dc/0x540 net/smc/af_smc.c:344
__sock_release net/socket.c:647 [inline]
sock_close+0xbc/0x240 net/socket.c:1391
__fput+0x3e9/0x9f0 fs/file_table.c:465
task_work_run+0x251/0x310 kernel/task_work.c:227
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0xa11/0x27f0 kernel/exit.c:953
do_group_exit+0x207/0x2c0 kernel/exit.c:1102
__do_sys_exit_group kernel/exit.c:1113 [inline]
__se_sys_exit_group kernel/exit.c:1111 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1111
x64_sys_call+0x26c3/0x26d0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Chain exists of:
rtnl_mutex --> sk_lock-AF_INET6 --> &smc->clcsock_release_lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&smc->clcsock_release_lock);
lock(sk_lock-AF_INET6);
lock(&smc->clcsock_release_lock);
lock(rtnl_mutex);
*** DEADLOCK ***
2 locks held by syz-executor200/5838:
#0: ffff888078efc408 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
#0: ffff888078efc408 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: __sock_release net/socket.c:646 [inline]
#0: ffff888078efc408 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: sock_close+0x90/0x240 net/socket.c:1391
#1: ffff888035260aa0 (&smc->clcsock_release_lock){+.+.}-{4:4}, at: smc_clcsock_release+0x82/0xf0 net/smc/smc_close.c:30
stack backtrace:
CPU: 0 UID: 0 PID: 5838 Comm: syz-executor200 Not tainted 6.14.0-syzkaller-13189-ge48e99b6edf4 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2079
check_noncircular+0x142/0x160 kernel/locking/lockdep.c:2211
check_prev_add kernel/locking/lockdep.c:3166 [inline]
check_prevs_add kernel/locking/lockdep.c:3285 [inline]
validate_chain+0xa69/0x24e0 kernel/locking/lockdep.c:3909
__lock_acquire+0xad5/0xd80 kernel/locking/lockdep.c:5235
lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
__mutex_lock_common kernel/locking/mutex.c:601 [inline]
__mutex_lock+0x1a5/0x10c0 kernel/locking/mutex.c:746
ipv6_sock_ac_close+0xc9/0x130 net/ipv6/anycast.c:220
inet6_release+0x4f/0x70 net/ipv6/af_inet6.c:485
__sock_release net/socket.c:647 [inline]
sock_release+0x82/0x150 net/socket.c:675
smc_clcsock_release+0xcc/0xf0 net/smc/smc_close.c:34
__smc_release+0x683/0x800 net/smc/af_smc.c:301
smc_release+0x2dc/0x540 net/smc/af_smc.c:344
__sock_release net/socket.c:647 [inline]
sock_close+0xbc/0x240 net/socket.c:1391
__fput+0x3e9/0x9f0 fs/file_table.c:465
task_work_run+0x251/0x310 kernel/task_work.c:227
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0xa11/0x27f0 kernel/exit.c:953
do_group_exit+0x207/0x2c0 kernel/exit.c:1102
__do_sys_exit_group kernel/exit.c:1113 [inline]
__se_sys_exit_group kernel/exit.c:1111 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1111
x64_sys_call+0x26c3/0x26d0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd6e1b18d39
Code: Unable to access opcode bytes at 0x7fd6e1b18d0f.
R
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
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