./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor3047595499 <...> Warning: Permanently added '10.128.1.43' (ED25519) to the list of known hosts. execve("./syz-executor3047595499", ["./syz-executor3047595499"], 0x7fff756cdcf0 /* 10 vars */) = 0 brk(NULL) = 0x55558803c000 brk(0x55558803cd00) = 0x55558803cd00 arch_prctl(ARCH_SET_FS, 0x55558803c380) = 0 set_tid_address(0x55558803c650) = 5831 set_robust_list(0x55558803c660, 24) = 0 rseq(0x55558803cca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor3047595499", 4096) = 28 getrandom("\x54\xe4\x53\x0b\x44\xc6\x55\x10", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55558803cd00 brk(0x55558805dd00) = 0x55558805dd00 brk(0x55558805e000) = 0x55558805e000 mprotect(0x7f1dae08d000, 16384, PROT_READ) = 0 mmap(0x3ffffffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x3ffffffff000 mmap(0x400000000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x400000000000 mmap(0x400001000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x400001000000 executing program write(1, "executing program\n", 18) = 18 socket(AF_INET, SOCK_DGRAM, IPPROTO_IP) = 3 setsockopt(3, SOL_IP, IP_ADD_MEMBERSHIP, NULL, 0) = -1 EINVAL (Invalid argument) socket(AF_INET, SOCK_STREAM, 256) = 4 setsockopt(4, SOL_IP, MCAST_MSFILTER, NULL, 0) = -1 EINVAL (Invalid argument) [ 61.735167][ T5831] [ 61.737520][ T5831] ====================================================== [ 61.744548][ T5831] WARNING: possible circular locking dependency detected [ 61.751861][ T5831] 6.14.0-rc1-syzkaller-00197-gacdefab0dcbc #0 Not tainted [ 61.758951][ T5831] ------------------------------------------------------ [ 61.765969][ T5831] syz-executor304/5831 is trying to acquire lock: [ 61.772362][ T5831] ffff888035068aa8 (&smc->clcsock_release_lock){+.+.}-{4:4}, at: smc_switch_to_fallback+0x35/0xd90 [ 61.783283][ T5831] [ 61.783283][ T5831] but task is already holding lock: [ 61.790659][ T5831] ffff888035068258 (sk_lock-AF_INET){+.+.}-{0:0}, at: smc_sendmsg+0x55/0x530 [ 61.799515][ T5831] [ 61.799515][ T5831] which lock already depends on the new lock. [ 61.799515][ T5831] [ 61.809899][ T5831] [ 61.809899][ T5831] the existing dependency chain (in reverse order) is: [ 61.818891][ T5831] [ 61.818891][ T5831] -> #2 (sk_lock-AF_INET){+.+.}-{0:0}: [ 61.826524][ T5831] lock_acquire+0x1ed/0x550 [ 61.831541][ T5831] lock_sock_nested+0x48/0x100 [ 61.836821][ T5831] do_ip_setsockopt+0x1a2d/0x3cd0 [ 61.842356][ T5831] ip_setsockopt+0x63/0x100 [ 61.847368][ T5831] do_sock_setsockopt+0x3af/0x720 [ 61.852903][ T5831] __x64_sys_setsockopt+0x1ee/0x280 [ 61.858678][ T5831] do_syscall_64+0xf3/0x230 [ 61.863729][ T5831] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 61.870220][ T5831] [ 61.870220][ T5831] -> #1 (rtnl_mutex){+.+.}-{4:4}: [ 61.877413][ T5831] lock_acquire+0x1ed/0x550 [ 61.882428][ T5831] __mutex_lock+0x19c/0x1010 [ 61.887593][ T5831] do_ip_setsockopt+0x127d/0x3cd0 [ 61.893131][ T5831] ip_setsockopt+0x63/0x100 [ 61.898164][ T5831] smc_setsockopt+0x275/0xe50 [ 61.903372][ T5831] do_sock_setsockopt+0x3af/0x720 [ 61.909103][ T5831] __x64_sys_setsockopt+0x1ee/0x280 [ 61.914912][ T5831] do_syscall_64+0xf3/0x230 [ 61.919928][ T5831] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 61.926340][ T5831] [ 61.926340][ T5831] -> #0 (&smc->clcsock_release_lock){+.+.}-{4:4}: [ 61.935025][ T5831] validate_chain+0x18ef/0x5920 [ 61.940399][ T5831] __lock_acquire+0x1397/0x2100 [ 61.945770][ T5831] lock_acquire+0x1ed/0x550 [ 61.950811][ T5831] __mutex_lock+0x19c/0x1010 [ 61.955952][ T5831] smc_switch_to_fallback+0x35/0xd90 [ 61.961784][ T5831] smc_sendmsg+0x11f/0x530 [ 61.966718][ T5831] __sock_sendmsg+0x221/0x270 [ 61.971954][ T5831] ____sys_sendmsg+0x52a/0x7e0 [ 61.977238][ T5831] __sys_sendmsg+0x269/0x350 [ 61.982344][ T5831] do_syscall_64+0xf3/0x230 [ 61.987365][ T5831] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 61.993925][ T5831] [ 61.993925][ T5831] other info that might help us debug this: [ 61.993925][ T5831] [ 62.004166][ T5831] Chain exists of: [ 62.004166][ T5831] &smc->clcsock_release_lock --> rtnl_mutex --> sk_lock-AF_INET [ 62.004166][ T5831] [ 62.017744][ T5831] Possible unsafe locking scenario: [ 62.017744][ T5831] [ 62.025222][ T5831] CPU0 CPU1 [ 62.030600][ T5831] ---- ---- [ 62.036005][ T5831] lock(sk_lock-AF_INET); [ 62.040524][ T5831] lock(rtnl_mutex); [ 62.047046][ T5831] lock(sk_lock-AF_INET); [ 62.053992][ T5831] lock(&smc->clcsock_release_lock); [ 62.059385][ T5831] [ 62.059385][ T5831] *** DEADLOCK *** [ 62.059385][ T5831] [ 62.067535][ T5831] 1 lock held by syz-executor304/5831: [ 62.072996][ T5831] #0: ffff888035068258 (sk_lock-AF_INET){+.+.}-{0:0}, at: smc_sendmsg+0x55/0x530 [ 62.082214][ T5831] [ 62.082214][ T5831] stack backtrace: [ 62.088360][ T5831] CPU: 1 UID: 0 PID: 5831 Comm: syz-executor304 Not tainted 6.14.0-rc1-syzkaller-00197-gacdefab0dcbc #0 [ 62.088372][ T5831] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 [ 62.088381][ T5831] Call Trace: [ 62.088388][ T5831] [ 62.088393][ T5831] dump_stack_lvl+0x241/0x360 [ 62.088407][ T5831] ? __pfx_dump_stack_lvl+0x10/0x10 [ 62.088416][ T5831] ? __pfx__printk+0x10/0x10 [ 62.088431][ T5831] print_circular_bug+0x13a/0x1b0 [ 62.088441][ T5831] check_noncircular+0x36a/0x4a0 [ 62.088451][ T5831] ? __pfx_check_noncircular+0x10/0x10 [ 62.088460][ T5831] ? lockdep_lock+0x123/0x2b0 [ 62.088473][ T5831] validate_chain+0x18ef/0x5920 [ 62.088483][ T5831] ? validate_chain+0x11e/0x5920 [ 62.088493][ T5831] ? __pfx_validate_chain+0x10/0x10 [ 62.088501][ T5831] ? __lock_acquire+0x1397/0x2100 [ 62.088512][ T5831] ? validate_chain+0x11e/0x5920 [ 62.088520][ T5831] ? mark_lock+0x9a/0x360 [ 62.088532][ T5831] ? validate_chain+0x11e/0x5920 [ 62.088539][ T5831] ? validate_chain+0x11e/0x5920 [ 62.088548][ T5831] ? validate_chain+0x11e/0x5920 [ 62.088557][ T5831] ? mark_lock+0x9a/0x360 [ 62.088568][ T5831] ? __pfx_validate_chain+0x10/0x10 [ 62.088576][ T5831] __lock_acquire+0x1397/0x2100 [ 62.088590][ T5831] lock_acquire+0x1ed/0x550 [ 62.088601][ T5831] ? smc_switch_to_fallback+0x35/0xd90 [ 62.088615][ T5831] ? __pfx_lock_acquire+0x10/0x10 [ 62.088626][ T5831] ? __pfx___might_resched+0x10/0x10 [ 62.088637][ T5831] ? __lock_acquire+0x1397/0x2100 [ 62.088649][ T5831] __mutex_lock+0x19c/0x1010 [ 62.088661][ T5831] ? smc_switch_to_fallback+0x35/0xd90 [ 62.088673][ T5831] ? mark_lock+0x9a/0x360 [ 62.088685][ T5831] ? smc_switch_to_fallback+0x35/0xd90 [ 62.088695][ T5831] ? lockdep_hardirqs_on_prepare+0x43d/0x780 [ 62.088706][ T5831] ? __pfx___mutex_lock+0x10/0x10 [ 62.088717][ T5831] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 62.088730][ T5831] ? __local_bh_enable_ip+0x168/0x200 [ 62.088739][ T5831] ? lockdep_hardirqs_on+0x99/0x150 [ 62.088750][ T5831] ? __local_bh_enable_ip+0x168/0x200 [ 62.088759][ T5831] smc_switch_to_fallback+0x35/0xd90 [ 62.088770][ T5831] ? do_raw_spin_unlock+0x13c/0x8b0 [ 62.088785][ T5831] smc_sendmsg+0x11f/0x530 [ 62.088797][ T5831] ? __pfx_smc_sendmsg+0x10/0x10 [ 62.088807][ T5831] __sock_sendmsg+0x221/0x270 [ 62.088819][ T5831] ____sys_sendmsg+0x52a/0x7e0 [ 62.088829][ T5831] ? __pfx_____sys_sendmsg+0x10/0x10 [ 62.088839][ T5831] ? do_raw_spin_lock+0x14f/0x370 [ 62.088849][ T5831] __sys_sendmsg+0x269/0x350 [ 62.088858][ T5831] ? __pfx___sys_sendmsg+0x10/0x10 [ 62.088868][ T5831] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 62.088882][ T5831] ? _raw_spin_unlock_irq+0x2e/0x50 [ 62.088891][ T5831] ? ptrace_notify+0x279/0x380 [ 62.088901][ T5831] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 62.088913][ T5831] ? exc_page_fault+0x590/0x8b0 [ 62.088924][ T5831] do_syscall_64+0xf3/0x230 [ 62.088936][ T5831] ? clear_bhb_loop+0x35/0x90 [ 62.088949][ T5831] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 62.088961][ T5831] RIP: 0033:0x7f1dae01a369 [ 62.088973][ T5831] 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 [ 62.088980][ T5831] RSP: 002b:00007ffd2c2dabd8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 62.088990][ T5831] RAX: ffffffffffffffda RBX: 00007ffd2c2dada8 RCX: 00007f1dae01a369 [ 62.088996][ T5831] RDX: 0000000020001090 RSI: 00004000000003c0 RDI: 0000000000000004 sendmsg(4, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base=NULL, iov_len=0}], msg_iovlen=1, msg_controllen=0, msg_flags=MSG_ZEROCOPY}, MSG_PROBE|MSG_EOR|MSG_RST|MSG_FASTOPEN) = -1 EINVAL (Invalid argument) exit_group(0) = ? +++ exited with 0 +++ [ 62.089002][ T5831] RBP: 00007f1dae08d610 R08: 00007ffd2c2dada8 R09: 00007ffd2c2dada8