./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor2455376685 <...> Warning: Permanently added '10.128.1.131' (ED25519) to the list of known hosts. execve("./syz-executor2455376685", ["./syz-executor2455376685"], 0x7ffc575240f0 /* 10 vars */) = 0 brk(NULL) = 0x555569127000 brk(0x555569127d00) = 0x555569127d00 arch_prctl(ARCH_SET_FS, 0x555569127380) = 0 set_tid_address(0x555569127650) = 5836 set_robust_list(0x555569127660, 24) = 0 rseq(0x555569127ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor2455376685", 4096) = 28 getrandom("\x70\xbb\xfa\x7c\x11\xd1\x7c\x1c", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555569127d00 brk(0x555569148d00) = 0x555569148d00 brk(0x555569149000) = 0x555569149000 mprotect(0x7f09dfa04000, 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_NETLINK, SOCK_DGRAM, NETLINK_ROUTE) = 3 [ 78.055125][ T5836] netlink: 'syz-executor245': attribute type 11 has an invalid length. [ 78.063621][ T5836] [ 78.065953][ T5836] ===================================== [ 78.071489][ T5836] WARNING: bad unlock balance detected! [ 78.077045][ T5836] 6.14.0-rc4-syzkaller-00873-g3424291dd242 #0 Not tainted [ 78.084150][ T5836] ------------------------------------- [ 78.089683][ T5836] syz-executor245/5836 is trying to release lock (rtnl_mutex) at: [ 78.097496][ T5836] [] __rtnl_unlock+0x6c/0xf0 [ 78.103678][ T5836] but there are no more locks to release! [ 78.109404][ T5836] [ 78.109404][ T5836] other info that might help us debug this: [ 78.117464][ T5836] no locks held by syz-executor245/5836. [ 78.123119][ T5836] [ 78.123119][ T5836] stack backtrace: [ 78.129036][ T5836] CPU: 0 UID: 0 PID: 5836 Comm: syz-executor245 Not tainted 6.14.0-rc4-syzkaller-00873-g3424291dd242 #0 [ 78.129055][ T5836] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 [ 78.129067][ T5836] Call Trace: [ 78.129077][ T5836] [ 78.129084][ T5836] dump_stack_lvl+0x241/0x360 [ 78.129104][ T5836] ? __pfx_dump_stack_lvl+0x10/0x10 [ 78.129119][ T5836] ? __pfx__printk+0x10/0x10 [ 78.129136][ T5836] ? __rtnl_unlock+0x6c/0xf0 [ 78.129156][ T5836] print_unlock_imbalance_bug+0x25b/0x2d0 [ 78.129174][ T5836] ? __pfx_print_unlock_imbalance_bug+0x10/0x10 [ 78.129213][ T5836] ? _printk+0xd5/0x120 [ 78.129228][ T5836] lock_release+0x47e/0xa30 [ 78.129250][ T5836] ? __lock_acquire+0x1397/0x2100 [ 78.129271][ T5836] ? __rtnl_unlock+0x6c/0xf0 [ 78.129291][ T5836] ? __pfx_lock_release+0x10/0x10 [ 78.129315][ T5836] ? __rtnl_unlock+0x6c/0xf0 [ 78.129335][ T5836] __mutex_unlock_slowpath+0xec/0x800 [ 78.129361][ T5836] ? __pfx___mutex_unlock_slowpath+0x10/0x10 [ 78.129383][ T5836] ? __pfx_lock_release+0x10/0x10 [ 78.129403][ T5836] ? validate_chain+0x11e/0x5920 [ 78.129421][ T5836] ? lwtunnel_valid_encap_type+0x8a/0x5f0 [ 78.129442][ T5836] __rtnl_unlock+0x6c/0xf0 [ 78.129463][ T5836] lwtunnel_valid_encap_type+0x38a/0x5f0 [ 78.129484][ T5836] ? lwtunnel_valid_encap_type+0x8a/0x5f0 [ 78.129506][ T5836] lwtunnel_valid_encap_type_attr+0x113/0x270 [ 78.129529][ T5836] rtm_to_fib_config+0x949/0x14e0 [ 78.129558][ T5836] inet_rtm_newroute+0xf6/0x2a0 [ 78.129580][ T5836] ? __pfx_inet_rtm_newroute+0x10/0x10 [ 78.129607][ T5836] ? __pfx_inet_rtm_newroute+0x10/0x10 [ 78.129628][ T5836] rtnetlink_rcv_msg+0x791/0xcf0 [ 78.129644][ T5836] ? rtnetlink_rcv_msg+0x1a7/0xcf0 [ 78.129661][ T5836] ? __lock_acquire+0x1397/0x2100 [ 78.129682][ T5836] ? __pfx_rtnetlink_rcv_msg+0x10/0x10 [ 78.129703][ T5836] netlink_rcv_skb+0x206/0x480 [ 78.129720][ T5836] ? __pfx_rtnetlink_rcv_msg+0x10/0x10 [ 78.129737][ T5836] ? __pfx_netlink_rcv_skb+0x10/0x10 [ 78.129760][ T5836] ? netlink_deliver_tap+0x2e/0x1b0 [ 78.129777][ T5836] netlink_unicast+0x7f6/0x990 [ 78.129793][ T5836] ? __pfx_netlink_unicast+0x10/0x10 [ 78.129807][ T5836] ? __virt_addr_valid+0x45f/0x530 [ 78.129820][ T5836] ? __phys_addr_symbol+0x2f/0x70 [ 78.129842][ T5836] ? __check_object_size+0x47a/0x730 [ 78.129862][ T5836] netlink_sendmsg+0x8de/0xcb0 [ 78.129883][ T5836] ? __pfx_netlink_sendmsg+0x10/0x10 [ 78.129900][ T5836] ? __lock_acquire+0x1397/0x2100 [ 78.129920][ T5836] ? aa_sock_msg_perm+0x91/0x160 [ 78.129948][ T5836] ? __pfx_netlink_sendmsg+0x10/0x10 [ 78.129964][ T5836] __sock_sendmsg+0x221/0x270 [ 78.129982][ T5836] ____sys_sendmsg+0x53a/0x860 [ 78.130006][ T5836] ? __pfx_____sys_sendmsg+0x10/0x10 [ 78.130029][ T5836] ? do_raw_spin_lock+0x14f/0x370 [ 78.130050][ T5836] __sys_sendmsg+0x269/0x350 [ 78.130073][ T5836] ? __pfx___sys_sendmsg+0x10/0x10 [ 78.130108][ T5836] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 78.130130][ T5836] ? exc_page_fault+0x590/0x8b0 [ 78.130152][ T5836] do_syscall_64+0xf3/0x230 [ 78.130173][ T5836] ? clear_bhb_loop+0x35/0x90 [ 78.130200][ T5836] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 78.130220][ T5836] RIP: 0033:0x7f09df9913e9 [ 78.130236][ T5836] 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 [ 78.130248][ T5836] RSP: 002b:00007ffd5288a738 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 78.130264][ T5836] RAX: ffffffffffffffda RBX: 00007ffd5288a908 RCX: 00007f09df9913e9 [ 78.130275][ T5836] RDX: 0000000000000000 RSI: 0000400000000000 RDI: 0000000000000003 [ 78.130284][ T5836] RBP: 00007f09dfa04610 R08: 0000000000000000 R09: 00007ffd5288a908 [ 78.130294][ T5836] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 78.130302][ T5836] R13: 00007ffd5288a8f8 R14: 0000000000000001 R15: 0000000000000001 sendmsg(3, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\xd8\x00\x00\x00\x18\x00\x81\x06\x4e\x81\xf7\x82\xdb\x4c\xb9\x04\x02\x1d\x08\x00\xfd\x00\x7c\x05\xe8\xfe\x55\xa1\x0a\x00\x0b\x00\x01\x40\x02\x02\x03\x60\x0e\x41\xb0\x00\x09\x00\xac\x00\x06\x03\x11\x00\x00\x00\x16\x00\x15\x00\x09\x00\x02\x00\x00\x00\x03\x5c\x3b\x61\xc1\xd6\x7f\x6f\x94\x00\x71\x34\xcf\x6e\xfb\x80\x00\xa0\x07\xa2\x90\x45\x7f\x01\xa7\xce\xe4\x09\x00\x00\x00\x1f\xb7\x91\x64\x3a\x5e\xe4"..., iov_len=216}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 216 exit_group(0) = ? +++ exited with 0 +++ [ 78.130316][