./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor2494430485 <...> forked to background, child pid 3187 no interfaces have a carrier [ 28.074180][ T3188] 8021q: adding VLAN 0 to HW filter on device bond0 [ 28.085305][ T3188] eql: remember to turn off Van-Jacobson compression on your slave devices Starting sshd: OK syzkaller Warning: Permanently added '10.128.0.191' (ECDSA) to the list of known hosts. execve("./syz-executor2494430485", ["./syz-executor2494430485"], 0x7ffe22e29210 /* 10 vars */) = 0 brk(NULL) = 0x5555571f8000 brk(0x5555571f8c40) = 0x5555571f8c40 arch_prctl(ARCH_SET_FS, 0x5555571f8300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor2494430485", 4096) = 28 brk(0x555557219c40) = 0x555557219c40 brk(0x55555721a000) = 0x55555721a000 mprotect(0x7f77baa65000, 16384, PROT_READ) = 0 mmap(0x1ffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffff000 mmap(0x20000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x20000000 mmap(0x21000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x21000000 socket(AF_INET6, SOCK_DGRAM, IPPROTO_IP) = 3 setsockopt(3, SOL_SOCKET, SO_REUSEPORT, [9], 4) = 0 bind(3, {sa_family=AF_INET6, sin6_port=htons(3618), sin6_flowinfo=htonl(0), inet_pton(AF_INET6, "::", &sin6_addr), sin6_scope_id=0}, 28) = 0 exit_group(0) = ? syzkaller login: [ 50.599740][ T3616] [ 50.602211][ T3616] ============================= [ 50.607044][ T3616] WARNING: suspicious RCU usage [ 50.611942][ T3616] 6.0.0-rc1-next-20220818-syzkaller #0 Not tainted [ 50.618449][ T3616] ----------------------------- [ 50.623337][ T3616] include/net/sock.h:592 suspicious rcu_dereference_check() usage! [ 50.631259][ T3616] [ 50.631259][ T3616] other info that might help us debug this: [ 50.631259][ T3616] [ 50.641521][ T3616] [ 50.641521][ T3616] rcu_scheduler_active = 2, debug_locks = 1 [ 50.649593][ T3616] 4 locks held by syz-executor249/3616: [ 50.655179][ T3616] #0: ffff8880746e0210 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: __sock_release+0x86/0x280 [ 50.665814][ T3616] #1: ffffc900014c0ce8 (&table->hash[i].lock){+...}-{2:2}, at: udp_lib_unhash+0x1d5/0x730 [ 50.675866][ T3616] #2: ffffffff8d7beb78 (reuseport_lock){+...}-{2:2}, at: reuseport_detach_sock+0x22/0x4a0 [ 50.685959][ T3616] #3: ffff88802648abb8 (clock-AF_INET6){++..}-{2:2}, at: bpf_sk_reuseport_detach+0x26/0x190 [ 50.696189][ T3616] [ 50.696189][ T3616] stack backtrace: [ 50.702107][ T3616] CPU: 1 PID: 3616 Comm: syz-executor249 Not tainted 6.0.0-rc1-next-20220818-syzkaller #0 [ 50.711988][ T3616] syz-executor249[3616] cmdline: a [ 50.717777][ T3616] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 [ 50.727820][ T3616] Call Trace: [ 50.731096][ T3616] [ 50.734020][ T3616] dump_stack_lvl+0xcd/0x134 [ 50.738615][ T3616] bpf_sk_reuseport_detach+0x156/0x190 [ 50.744074][ T3616] reuseport_detach_sock+0x8c/0x4a0 [ 50.749272][ T3616] udp_lib_unhash+0x210/0x730 [ 50.753947][ T3616] ? udpv6_pre_connect+0x180/0x180 [ 50.759050][ T3616] sk_common_release+0xba/0x390 [ 50.763894][ T3616] inet_release+0x12e/0x270 [ 50.768397][ T3616] inet6_release+0x4c/0x70 [ 50.772806][ T3616] __sock_release+0xcd/0x280 [ 50.777392][ T3616] sock_close+0x18/0x20 [ 50.781543][ T3616] __fput+0x27c/0xa90 [ 50.785529][ T3616] ? __sock_release+0x280/0x280 [ 50.790382][ T3616] task_work_run+0xdd/0x1a0 [ 50.794877][ T3616] do_exit+0xc39/0x2b60 [ 50.799026][ T3616] ? lock_downgrade+0x6e0/0x6e0 [ 50.803869][ T3616] ? do_raw_spin_lock+0x120/0x2a0 [ 50.808889][ T3616] ? mm_update_next_owner+0x7a0/0x7a0 [ 50.814259][ T3616] ? rwlock_bug.part.0+0x90/0x90 [ 50.819194][ T3616] ? _raw_spin_unlock_irq+0x1f/0x40 [ 50.824385][ T3616] ? _raw_spin_unlock_irq+0x1f/0x40 [ 50.829581][ T3616] do_group_exit+0xd0/0x2a0 [ 50.834081][ T3616] __x64_sys_exit_group+0x3a/0x50 [ 50.839099][ T3616] do_syscall_64+0x35/0xb0 [ 50.843510][ T3616] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 50.849399][ T3616] RIP: 0033:0x7f77ba9f7679 [ 50.853805][ T3616] Code: Unable to access opcode bytes at RIP 0x7f77ba9f764f. [ 50.861162][ T3616] RSP: 002b:00007ffd12e41ed8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 50.869570][ T3616] RAX: ffffffffffffffda RBX: 00007f77baa6b270 RCX: 00007f77ba9f7679 [ 50.877535][ T3616] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 [ 50.885522][ T3616] RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000000 +++ exited with 0 +++ [ 50.893486][ T3616] R10: 0000000000000004 R11: 0000000000000246 R12: 00007f77baa6b270