Extracting prog: 1m10.67278503s Minimizing prog: 6m21.716508766s Simplifying prog options: 0s Extracting C: 57.423762577s Simplifying C: 3m31.790078895s 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:4 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=38.613648867s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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=38.613648867s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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=38.613648867s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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=38.613648867s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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=38.613648867s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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=38.613648867s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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=38.613648867s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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=38.613648867s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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$inet program crashed: possible deadlock in smc_switch_to_fallback simplifying C reproducer testing compiled C program (duration=38.613648867s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-setsockopt$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=38.613648867s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false 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$inet program crashed: possible deadlock in smc_switch_to_fallback testing compiled C program (duration=38.613648867s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-setsockopt$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=38.613648867s, {Threaded:false Repeat:false 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$inet program crashed: possible deadlock in smc_switch_to_fallback testing compiled C program (duration=38.613648867s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-setsockopt$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=38.613648867s, {Threaded:false Repeat:false 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$inet program crashed: possible deadlock in smc_switch_to_fallback testing compiled C program (duration=38.613648867s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-setsockopt$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 12m1.603155406s repro crashed as (corrupted=false): ====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc1-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor188/5942 is trying to acquire lock: ffff88802b258aa0 (&smc->clcsock_release_lock){+.+.}-{4:4}, at: smc_switch_to_fallback+0x2d/0x9f0 net/smc/af_smc.c:903 but task is already holding lock: ffff88802b258258 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1615 [inline] ffff88802b258258 (sk_lock-AF_INET){+.+.}-{0:0}, at: smc_sendmsg+0x47/0x520 net/smc/af_smc.c:2775 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (sk_lock-AF_INET){+.+.}-{0:0}: lock_sock_nested+0x41/0xf0 net/core/sock.c:3697 lock_sock include/net/sock.h:1615 [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 raw_setsockopt+0xb7/0x2a0 net/ipv4/raw.c:845 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] __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2324 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (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] __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2324 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&smc->clcsock_release_lock){+.+.}-{4:4}: 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 __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] __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2183 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 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: &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-executor188/5942: #0: ffff88802b258258 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1615 [inline] #0: ffff88802b258258 (sk_lock-AF_INET){+.+.}-{0:0}, at: smc_sendmsg+0x47/0x520 net/smc/af_smc.c:2775 stack backtrace: CPU: 1 UID: 0 PID: 5942 Comm: syz-executor188 Not tainted 6.15.0-rc1-syzkaller #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: __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 __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] __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2183 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f3fc0f5b369 Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe8141e928 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007ffe8141eb08 RCX: 00007f3fc0f5b369 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 00007f3fc0fce610 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000200007fd R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffe8141eaf8 R14: 0000000000000001 R15: 0000000000000001 final repro crashed as (corrupted=false): ====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc1-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor188/5942 is trying to acquire lock: ffff88802b258aa0 (&smc->clcsock_release_lock){+.+.}-{4:4}, at: smc_switch_to_fallback+0x2d/0x9f0 net/smc/af_smc.c:903 but task is already holding lock: ffff88802b258258 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1615 [inline] ffff88802b258258 (sk_lock-AF_INET){+.+.}-{0:0}, at: smc_sendmsg+0x47/0x520 net/smc/af_smc.c:2775 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (sk_lock-AF_INET){+.+.}-{0:0}: lock_sock_nested+0x41/0xf0 net/core/sock.c:3697 lock_sock include/net/sock.h:1615 [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 raw_setsockopt+0xb7/0x2a0 net/ipv4/raw.c:845 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] __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2324 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (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] __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2324 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&smc->clcsock_release_lock){+.+.}-{4:4}: 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 __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] __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2183 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 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: &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-executor188/5942: #0: ffff88802b258258 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1615 [inline] #0: ffff88802b258258 (sk_lock-AF_INET){+.+.}-{0:0}, at: smc_sendmsg+0x47/0x520 net/smc/af_smc.c:2775 stack backtrace: CPU: 1 UID: 0 PID: 5942 Comm: syz-executor188 Not tainted 6.15.0-rc1-syzkaller #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: __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 __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] __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2183 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f3fc0f5b369 Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe8141e928 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007ffe8141eb08 RCX: 00007f3fc0f5b369 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 00007f3fc0fce610 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000200007fd R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffe8141eaf8 R14: 0000000000000001 R15: 0000000000000001