Extracting prog: 1m23.125400084s
Minimizing prog: 10m35.532025866s
Simplifying prog options: 0s
Extracting C: 34.703502227s
Simplifying C: 8m30.682781523s


extracting reproducer from 1 programs
testing a last program of every proc
single: executing 1 programs separately with timeout 30s
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-setsockopt$inet_mreqn-socket$inet_smc-setsockopt$IP_VS_SO_SET_STARTDAEMON-socket$inet-sendto$inet
detailed listing:
executing program 0:
r0 = socket(0x840000000002, 0x3, 0xfa)
setsockopt$inet_mreqn(r0, 0x0, 0x24, 0x0, 0x0)
r1 = socket$inet_smc(0x2b, 0x1, 0x0)
setsockopt$IP_VS_SO_SET_STARTDAEMON(r1, 0x0, 0x48b, &(0x7f00000000c0)={0x2, 'dummy0\x00'}, 0x18)
r2 = socket$inet(0x2, 0x4000000000000001, 0x100)
sendto$inet(r2, 0x0, 0x0, 0x200007fd, 0x0, 0x0)

program crashed: possible deadlock in smc_switch_to_fallback
single: successfully extracted reproducer
found reproducer with 6 syscalls
minimizing guilty program
testing program (duration=1m11.610455793s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-setsockopt$inet_mreqn-socket$inet_smc-setsockopt$IP_VS_SO_SET_STARTDAEMON-socket$inet
detailed listing:
executing program 0:
r0 = socket(0x840000000002, 0x3, 0xfa)
setsockopt$inet_mreqn(r0, 0x0, 0x24, 0x0, 0x0)
r1 = socket$inet_smc(0x2b, 0x1, 0x0)
setsockopt$IP_VS_SO_SET_STARTDAEMON(r1, 0x0, 0x48b, &(0x7f00000000c0)={0x2, 'dummy0\x00'}, 0x18)
socket$inet(0x2, 0x4000000000000001, 0x100)

program did not crash
testing program (duration=1m11.610455793s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-setsockopt$inet_mreqn-socket$inet_smc-setsockopt$IP_VS_SO_SET_STARTDAEMON-sendto$inet
detailed listing:
executing program 0:
r0 = socket(0x840000000002, 0x3, 0xfa)
setsockopt$inet_mreqn(r0, 0x0, 0x24, 0x0, 0x0)
r1 = socket$inet_smc(0x2b, 0x1, 0x0)
setsockopt$IP_VS_SO_SET_STARTDAEMON(r1, 0x0, 0x48b, &(0x7f00000000c0)={0x2, 'dummy0\x00'}, 0x18)
sendto$inet(0xffffffffffffffff, 0x0, 0x0, 0x200007fd, 0x0, 0x0)

program did not crash
testing program (duration=1m11.610455793s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-setsockopt$inet_mreqn-socket$inet_smc-socket$inet-sendto$inet
detailed listing:
executing program 0:
r0 = socket(0x840000000002, 0x3, 0xfa)
setsockopt$inet_mreqn(r0, 0x0, 0x24, 0x0, 0x0)
socket$inet_smc(0x2b, 0x1, 0x0)
r1 = socket$inet(0x2, 0x4000000000000001, 0x100)
sendto$inet(r1, 0x0, 0x0, 0x200007fd, 0x0, 0x0)

program did not crash
testing program (duration=1m11.610455793s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-setsockopt$inet_mreqn-setsockopt$IP_VS_SO_SET_STARTDAEMON-socket$inet-sendto$inet
detailed listing:
executing program 0:
r0 = socket(0x840000000002, 0x3, 0xfa)
setsockopt$inet_mreqn(r0, 0x0, 0x24, 0x0, 0x0)
setsockopt$IP_VS_SO_SET_STARTDAEMON(0xffffffffffffffff, 0x0, 0x48b, &(0x7f00000000c0)={0x2, 'dummy0\x00'}, 0x18)
r1 = socket$inet(0x2, 0x4000000000000001, 0x100)
sendto$inet(r1, 0x0, 0x0, 0x200007fd, 0x0, 0x0)

program did not crash
testing program (duration=1m11.610455793s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-socket$inet_smc-setsockopt$IP_VS_SO_SET_STARTDAEMON-socket$inet-sendto$inet
detailed listing:
executing program 0:
socket(0x840000000002, 0x3, 0xfa)
r0 = socket$inet_smc(0x2b, 0x1, 0x0)
setsockopt$IP_VS_SO_SET_STARTDAEMON(r0, 0x0, 0x48b, &(0x7f00000000c0)={0x2, 'dummy0\x00'}, 0x18)
r1 = socket$inet(0x2, 0x4000000000000001, 0x100)
sendto$inet(r1, 0x0, 0x0, 0x200007fd, 0x0, 0x0)

program did not crash
testing program (duration=1m11.610455793s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): setsockopt$inet_mreqn-socket$inet_smc-setsockopt$IP_VS_SO_SET_STARTDAEMON-socket$inet-sendto$inet
detailed listing:
executing program 0:
setsockopt$inet_mreqn(0xffffffffffffffff, 0x0, 0x24, 0x0, 0x0)
r0 = socket$inet_smc(0x2b, 0x1, 0x0)
setsockopt$IP_VS_SO_SET_STARTDAEMON(r0, 0x0, 0x48b, &(0x7f00000000c0)={0x2, 'dummy0\x00'}, 0x18)
r1 = socket$inet(0x2, 0x4000000000000001, 0x100)
sendto$inet(r1, 0x0, 0x0, 0x200007fd, 0x0, 0x0)

program did not crash
testing program (duration=1m11.610455793s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-setsockopt$inet_mreqn-socket$inet_smc-setsockopt$IP_VS_SO_SET_STARTDAEMON-socket$inet-sendto$inet
detailed listing:
executing program 0:
r0 = socket(0x840000000002, 0x3, 0xfa)
setsockopt$inet_mreqn(r0, 0x0, 0x24, 0x0, 0x0)
r1 = socket$inet_smc(0x2b, 0x1, 0x0)
setsockopt$IP_VS_SO_SET_STARTDAEMON(r1, 0x0, 0x48b, 0x0, 0x0)
r2 = socket$inet(0x2, 0x4000000000000001, 0x100)
sendto$inet(r2, 0x0, 0x0, 0x200007fd, 0x0, 0x0)

program did not crash
extracting C reproducer
testing compiled C program (duration=1m11.610455793s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-setsockopt$inet_mreqn-socket$inet_smc-setsockopt$IP_VS_SO_SET_STARTDAEMON-socket$inet-sendto$inet
program crashed: possible deadlock in smc_switch_to_fallback
simplifying C reproducer
testing compiled C program (duration=1m11.610455793s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-setsockopt$inet_mreqn-socket$inet_smc-setsockopt$IP_VS_SO_SET_STARTDAEMON-socket$inet-sendto$inet
program did not crash
testing compiled C program (duration=1m11.610455793s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-setsockopt$inet_mreqn-socket$inet_smc-setsockopt$IP_VS_SO_SET_STARTDAEMON-socket$inet-sendto$inet
program crashed: possible deadlock in smc_switch_to_fallback
testing compiled C program (duration=1m11.610455793s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-setsockopt$inet_mreqn-socket$inet_smc-setsockopt$IP_VS_SO_SET_STARTDAEMON-socket$inet-sendto$inet
program crashed: possible deadlock in smc_switch_to_fallback
testing compiled C program (duration=1m11.610455793s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-setsockopt$inet_mreqn-socket$inet_smc-setsockopt$IP_VS_SO_SET_STARTDAEMON-socket$inet-sendto$inet
program crashed: possible deadlock in smc_switch_to_fallback
testing compiled C program (duration=1m11.610455793s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-setsockopt$inet_mreqn-socket$inet_smc-setsockopt$IP_VS_SO_SET_STARTDAEMON-socket$inet-sendto$inet
program crashed: possible deadlock in smc_switch_to_fallback
testing compiled C program (duration=1m11.610455793s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:false Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-setsockopt$inet_mreqn-socket$inet_smc-setsockopt$IP_VS_SO_SET_STARTDAEMON-socket$inet-sendto$inet
program crashed: possible deadlock in smc_switch_to_fallback
testing compiled C program (duration=1m11.610455793s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-setsockopt$inet_mreqn-socket$inet_smc-setsockopt$IP_VS_SO_SET_STARTDAEMON-socket$inet-sendto$inet
program crashed: possible deadlock in smc_switch_to_fallback
reproducing took 21m4.043731815s
repro crashed as (corrupted=false):
======================================================
WARNING: possible circular locking dependency detected
6.13.0-rc6-syzkaller-00133-g47e55e4b410f #0 Not tainted
------------------------------------------------------
syz-executor318/5823 is trying to acquire lock:
ffff888032790aa8 (&smc->clcsock_release_lock){+.+.}-{4:4}, at: smc_switch_to_fallback+0x35/0xd90 net/smc/af_smc.c:903

but task is already holding lock:
ffff888032790258 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1623 [inline]
ffff888032790258 (sk_lock-AF_INET){+.+.}-{0:0}, at: smc_sendmsg+0x55/0x530 net/smc/af_smc.c:2772

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (sk_lock-AF_INET){+.+.}-{0:0}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       lock_sock_nested+0x48/0x100 net/core/sock.c:3625
       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:2313
       __sys_setsockopt net/socket.c:2338 [inline]
       __do_sys_setsockopt net/socket.c:2344 [inline]
       __se_sys_setsockopt net/socket.c:2341 [inline]
       __x64_sys_setsockopt+0x1ee/0x280 net/socket.c:2341
       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 (rtnl_mutex){+.+.}-{4:4}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       __mutex_lock_common kernel/locking/mutex.c:585 [inline]
       __mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735
       start_sync_thread+0xdc/0x2dc0 net/netfilter/ipvs/ip_vs_sync.c:1761
       do_ip_vs_set_ctl+0x442/0x13d0 net/netfilter/ipvs/ip_vs_ctl.c:2732
       nf_setsockopt+0x295/0x2c0 net/netfilter/nf_sockopt.c:101
       smc_setsockopt+0x275/0xe50 net/smc/af_smc.c:3078
       do_sock_setsockopt+0x3af/0x720 net/socket.c:2313
       __sys_setsockopt net/socket.c:2338 [inline]
       __do_sys_setsockopt net/socket.c:2344 [inline]
       __se_sys_setsockopt net/socket.c:2341 [inline]
       __x64_sys_setsockopt+0x1ee/0x280 net/socket.c:2341
       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 (&smc->clcsock_release_lock){+.+.}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3161 [inline]
       check_prevs_add kernel/locking/lockdep.c:3280 [inline]
       validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
       __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       __mutex_lock_common kernel/locking/mutex.c:585 [inline]
       __mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735
       smc_switch_to_fallback+0x35/0xd90 net/smc/af_smc.c:903
       smc_sendmsg+0x11f/0x530 net/smc/af_smc.c:2778
       sock_sendmsg_nosec net/socket.c:711 [inline]
       __sock_sendmsg+0x221/0x270 net/socket.c:726
       __sys_sendto+0x363/0x4c0 net/socket.c:2197
       __do_sys_sendto net/socket.c:2204 [inline]
       __se_sys_sendto net/socket.c:2200 [inline]
       __x64_sys_sendto+0xde/0x100 net/socket.c:2200
       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:
  &smc->clcsock_release_lock --> rtnl_mutex --> sk_lock-AF_INET

 Possible unsafe locking scenario:

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

 *** DEADLOCK ***

1 lock held by syz-executor318/5823:
 #0: ffff888032790258 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1623 [inline]
 #0: ffff888032790258 (sk_lock-AF_INET){+.+.}-{0:0}, at: smc_sendmsg+0x55/0x530 net/smc/af_smc.c:2772

stack backtrace:
CPU: 1 UID: 0 PID: 5823 Comm: syz-executor318 Not tainted 6.13.0-rc6-syzkaller-00133-g47e55e4b410f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074
 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206
 check_prev_add kernel/locking/lockdep.c:3161 [inline]
 check_prevs_add kernel/locking/lockdep.c:3280 [inline]
 validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
 __mutex_lock_common kernel/locking/mutex.c:585 [inline]
 __mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735
 smc_switch_to_fallback+0x35/0xd90 net/smc/af_smc.c:903
 smc_sendmsg+0x11f/0x530 net/smc/af_smc.c:2778
 sock_sendmsg_nosec net/socket.c:711 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:726
 __sys_sendto+0x363/0x4c0 net/socket.c:2197
 __do_sys_sendto net/socket.c:2204 [inline]
 __se_sys_sendto net/socket.c:2200 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2200
 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: 0033:0x7feda03bb3e9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007feda0376208 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007feda0445328 RCX: 00007feda03bb3e9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007feda0445320 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000200007fd R11: 0000000000000246 R12: 00007feda044532c
R13: 00007feda0412074 R14: 0000840000000002 R15: 4000000000000001
 </TASK>

final repro crashed as (corrupted=false):
======================================================
WARNING: possible circular locking dependency detected
6.13.0-rc6-syzkaller-00133-g47e55e4b410f #0 Not tainted
------------------------------------------------------
syz-executor318/5823 is trying to acquire lock:
ffff888032790aa8 (&smc->clcsock_release_lock){+.+.}-{4:4}, at: smc_switch_to_fallback+0x35/0xd90 net/smc/af_smc.c:903

but task is already holding lock:
ffff888032790258 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1623 [inline]
ffff888032790258 (sk_lock-AF_INET){+.+.}-{0:0}, at: smc_sendmsg+0x55/0x530 net/smc/af_smc.c:2772

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (sk_lock-AF_INET){+.+.}-{0:0}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       lock_sock_nested+0x48/0x100 net/core/sock.c:3625
       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:2313
       __sys_setsockopt net/socket.c:2338 [inline]
       __do_sys_setsockopt net/socket.c:2344 [inline]
       __se_sys_setsockopt net/socket.c:2341 [inline]
       __x64_sys_setsockopt+0x1ee/0x280 net/socket.c:2341
       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 (rtnl_mutex){+.+.}-{4:4}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       __mutex_lock_common kernel/locking/mutex.c:585 [inline]
       __mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735
       start_sync_thread+0xdc/0x2dc0 net/netfilter/ipvs/ip_vs_sync.c:1761
       do_ip_vs_set_ctl+0x442/0x13d0 net/netfilter/ipvs/ip_vs_ctl.c:2732
       nf_setsockopt+0x295/0x2c0 net/netfilter/nf_sockopt.c:101
       smc_setsockopt+0x275/0xe50 net/smc/af_smc.c:3078
       do_sock_setsockopt+0x3af/0x720 net/socket.c:2313
       __sys_setsockopt net/socket.c:2338 [inline]
       __do_sys_setsockopt net/socket.c:2344 [inline]
       __se_sys_setsockopt net/socket.c:2341 [inline]
       __x64_sys_setsockopt+0x1ee/0x280 net/socket.c:2341
       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 (&smc->clcsock_release_lock){+.+.}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3161 [inline]
       check_prevs_add kernel/locking/lockdep.c:3280 [inline]
       validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
       __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       __mutex_lock_common kernel/locking/mutex.c:585 [inline]
       __mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735
       smc_switch_to_fallback+0x35/0xd90 net/smc/af_smc.c:903
       smc_sendmsg+0x11f/0x530 net/smc/af_smc.c:2778
       sock_sendmsg_nosec net/socket.c:711 [inline]
       __sock_sendmsg+0x221/0x270 net/socket.c:726
       __sys_sendto+0x363/0x4c0 net/socket.c:2197
       __do_sys_sendto net/socket.c:2204 [inline]
       __se_sys_sendto net/socket.c:2200 [inline]
       __x64_sys_sendto+0xde/0x100 net/socket.c:2200
       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:
  &smc->clcsock_release_lock --> rtnl_mutex --> sk_lock-AF_INET

 Possible unsafe locking scenario:

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

 *** DEADLOCK ***

1 lock held by syz-executor318/5823:
 #0: ffff888032790258 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1623 [inline]
 #0: ffff888032790258 (sk_lock-AF_INET){+.+.}-{0:0}, at: smc_sendmsg+0x55/0x530 net/smc/af_smc.c:2772

stack backtrace:
CPU: 1 UID: 0 PID: 5823 Comm: syz-executor318 Not tainted 6.13.0-rc6-syzkaller-00133-g47e55e4b410f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074
 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206
 check_prev_add kernel/locking/lockdep.c:3161 [inline]
 check_prevs_add kernel/locking/lockdep.c:3280 [inline]
 validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
 __mutex_lock_common kernel/locking/mutex.c:585 [inline]
 __mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735
 smc_switch_to_fallback+0x35/0xd90 net/smc/af_smc.c:903
 smc_sendmsg+0x11f/0x530 net/smc/af_smc.c:2778
 sock_sendmsg_nosec net/socket.c:711 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:726
 __sys_sendto+0x363/0x4c0 net/socket.c:2197
 __do_sys_sendto net/socket.c:2204 [inline]
 __se_sys_sendto net/socket.c:2200 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2200
 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: 0033:0x7feda03bb3e9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007feda0376208 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007feda0445328 RCX: 00007feda03bb3e9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007feda0445320 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000200007fd R11: 0000000000000246 R12: 00007feda044532c
R13: 00007feda0412074 R14: 0000840000000002 R15: 4000000000000001
 </TASK>