======================================================
WARNING: possible circular locking dependency detected
6.15.0-rc2-syzkaller-00048-gc62f4b82d571 #0 Not tainted
------------------------------------------------------
syz.1.336/6914 is trying to acquire lock:
ffff88806956db98 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1651 [inline]
ffff88806956db98 (sk_lock-AF_INET){+.+.}-{0:0}, at: sockopt_lock_sock net/core/sock.c:1148 [inline]
ffff88806956db98 (sk_lock-AF_INET){+.+.}-{0:0}, at: sockopt_lock_sock+0x54/0x70 net/core/sock.c:1139
but task is already holding lock:
ffffffff9012e6e8 (rtnl_mutex){+.+.}-{4:4}, at: do_ip_setsockopt+0xf6/0x3240 net/ipv4/ip_sockglue.c:1077
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (rtnl_mutex){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:601 [inline]
__mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746
start_sync_thread+0x120/0x28b0 net/netfilter/ipvs/ip_vs_sync.c:1761
do_ip_vs_set_ctl+0x451/0x11d0 net/netfilter/ipvs/ip_vs_ctl.c:2732
nf_setsockopt+0x8a/0xf0 net/netfilter/nf_sockopt.c:101
ip_setsockopt+0xcb/0xf0 net/ipv4/ip_sockglue.c:1424
tcp_setsockopt+0xa4/0x100 net/ipv4/tcp.c:4077
smc_setsockopt+0x1b3/0xa00 net/smc/af_smc.c:3081
do_sock_setsockopt+0x221/0x470 net/socket.c:2296
__sys_setsockopt+0x1a0/0x230 net/socket.c:2321
__do_sys_setsockopt net/socket.c:2327 [inline]
__se_sys_setsockopt net/socket.c:2324 [inline]
__ia32_sys_setsockopt+0xbc/0x160 net/socket.c:2324
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
-> #1 (&smc->clcsock_release_lock){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:601 [inline]
__mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746
smc_switch_to_fallback+0x2d/0x9f0 net/smc/af_smc.c:903
smc_sendmsg+0x13d/0x520 net/smc/af_smc.c:2781
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
__sys_sendto+0x495/0x510 net/socket.c:2180
__do_sys_sendto net/socket.c:2187 [inline]
__se_sys_sendto net/socket.c:2183 [inline]
__ia32_sys_sendto+0xdd/0x1b0 net/socket.c:2183
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
-> #0 (sk_lock-AF_INET){+.+.}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3166 [inline]
check_prevs_add kernel/locking/lockdep.c:3285 [inline]
validate_chain kernel/locking/lockdep.c:3909 [inline]
__lock_acquire+0x1173/0x1ba0 kernel/locking/lockdep.c:5235
lock_acquire kernel/locking/lockdep.c:5866 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823
lock_sock_nested+0x41/0xf0 net/core/sock.c:3702
lock_sock include/net/sock.h:1651 [inline]
sockopt_lock_sock net/core/sock.c:1148 [inline]
sockopt_lock_sock+0x54/0x70 net/core/sock.c:1139
do_ip_setsockopt+0xfe/0x3240 net/ipv4/ip_sockglue.c:1078
ip_setsockopt+0x59/0xf0 net/ipv4/ip_sockglue.c:1417
tcp_setsockopt+0xa4/0x100 net/ipv4/tcp.c:4077
do_sock_setsockopt+0x221/0x470 net/socket.c:2296
__sys_setsockopt+0x1a0/0x230 net/socket.c:2321
__do_sys_setsockopt net/socket.c:2327 [inline]
__se_sys_setsockopt net/socket.c:2324 [inline]
__ia32_sys_setsockopt+0xbc/0x160 net/socket.c:2324
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
other info that might help us debug this:
Chain exists of:
sk_lock-AF_INET --> &smc->clcsock_release_lock --> rtnl_mutex
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(rtnl_mutex);
lock(&smc->clcsock_release_lock);
lock(rtnl_mutex);
lock(sk_lock-AF_INET);
*** DEADLOCK ***
1 lock held by syz.1.336/6914:
#0: ffffffff9012e6e8 (rtnl_mutex){+.+.}-{4:4}, at: do_ip_setsockopt+0xf6/0x3240 net/ipv4/ip_sockglue.c:1077
stack backtrace:
CPU: 2 UID: 0 PID: 6914 Comm: syz.1.336 Not tainted 6.15.0-rc2-syzkaller-00048-gc62f4b82d571 #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2079
check_noncircular+0x14c/0x170 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 kernel/locking/lockdep.c:3909 [inline]
__lock_acquire+0x1173/0x1ba0 kernel/locking/lockdep.c:5235
lock_acquire kernel/locking/lockdep.c:5866 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823
lock_sock_nested+0x41/0xf0 net/core/sock.c:3702
lock_sock include/net/sock.h:1651 [inline]
sockopt_lock_sock net/core/sock.c:1148 [inline]
sockopt_lock_sock+0x54/0x70 net/core/sock.c:1139
do_ip_setsockopt+0xfe/0x3240 net/ipv4/ip_sockglue.c:1078
ip_setsockopt+0x59/0xf0 net/ipv4/ip_sockglue.c:1417
tcp_setsockopt+0xa4/0x100 net/ipv4/tcp.c:4077
do_sock_setsockopt+0x221/0x470 net/socket.c:2296
__sys_setsockopt+0x1a0/0x230 net/socket.c:2321
__do_sys_setsockopt net/socket.c:2327 [inline]
__se_sys_setsockopt net/socket.c:2324 [inline]
__ia32_sys_setsockopt+0xbc/0x160 net/socket.c:2324
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf70ee579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f50de55c EFLAGS: 00000296 ORIG_RAX: 000000000000016e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000000
RDX: 0000000000000027 RSI: 0000000080000000 RDI: 000000000000000c
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 10 06 adc %al,(%rsi)
2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi
6: 10 07 adc %al,(%rdi)
8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi
c: 10 08 adc %cl,(%rax)
e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi
1e: 00 51 52 add %dl,0x52(%rcx)
21: 55 push %rbp
22: 89 e5 mov %esp,%ebp
24: 0f 34 sysenter
26: cd 80 int $0x80
* 28: 5d pop %rbp <-- trapping instruction
29: 5a pop %rdx
2a: 59 pop %rcx
2b: c3 ret
2c: 90 nop
2d: 90 nop
2e: 90 nop
2f: 90 nop
30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi