./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor3192566297 <...> Warning: Permanently added '10.128.0.143' (ECDSA) to the list of known hosts. execve("./syz-executor3192566297", ["./syz-executor3192566297"], 0x7ffe33ca03d0 /* 10 vars */) = 0 brk(NULL) = 0x555555659000 brk(0x555555659c40) = 0x555555659c40 arch_prctl(ARCH_SET_FS, 0x555555659300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor3192566297", 4096) = 28 brk(0x55555567ac40) = 0x55555567ac40 brk(0x55555567b000) = 0x55555567b000 mprotect(0x7f468a4bc000, 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_DCCP, IPPROTO_IP) = 3 setsockopt(3, SOL_SOCKET, SO_REUSEPORT, [65537], 4) = 0 listen(3, 0) = 0 exit_group(0) = ? [ 46.602434][ T3609] [ 46.604887][ T3609] ============================= [ 46.609769][ T3609] WARNING: suspicious RCU usage [ 46.614618][ T3609] 6.0.0-rc1-next-20220818-syzkaller #0 Not tainted [ 46.621164][ T3609] ----------------------------- [ 46.626067][ T3609] include/net/sock.h:592 suspicious rcu_dereference_check() usage! [ 46.633950][ T3609] [ 46.633950][ T3609] other info that might help us debug this: [ 46.633950][ T3609] [ 46.644290][ T3609] [ 46.644290][ T3609] rcu_scheduler_active = 2, debug_locks = 1 [ 46.652504][ T3609] 5 locks held by syz-executor319/3609: [ 46.658081][ T3609] #0: ffff88806cc46810 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: __sock_release+0x86/0x280 [ 46.668694][ T3609] #1: ffff888026668bf0 (sk_lock-AF_INET6){+.+.}-{0:0}, at: dccp_close+0x7e/0xd50 [ 46.677961][ T3609] #2: ffff88802659e690 (&h->lhash2[i].lock){+.+.}-{2:2}, at: inet_unhash+0x345/0x680 [ 46.687599][ T3609] #3: ffffffff8d7beb78 (reuseport_lock){+...}-{2:2}, at: reuseport_detach_sock+0x22/0x4a0 [ 46.697658][ T3609] #4: ffff888026668e78 (clock-AF_INET6){++..}-{2:2}, at: bpf_sk_reuseport_detach+0x26/0x190 [ 46.707917][ T3609] [ 46.707917][ T3609] stack backtrace: [ 46.713793][ T3609] CPU: 0 PID: 3609 Comm: syz-executor319 Not tainted 6.0.0-rc1-next-20220818-syzkaller #0 [ 46.723669][ T3609] syz-executor319[3609] cmdline: a [ 46.729538][ T3609] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 [ 46.739596][ T3609] Call Trace: [ 46.742879][ T3609] [ 46.745803][ T3609] dump_stack_lvl+0xcd/0x134 [ 46.750398][ T3609] bpf_sk_reuseport_detach+0x156/0x190 [ 46.755869][ T3609] reuseport_detach_sock+0x8c/0x4a0 [ 46.761062][ T3609] ? rwlock_bug.part.0+0x90/0x90 [ 46.766020][ T3609] reuseport_stop_listen_sock+0x6d/0x500 [ 46.771696][ T3609] inet_unhash+0x3b1/0x680 [ 46.776119][ T3609] dccp_set_state+0x2af/0x3a0 [ 46.780798][ T3609] dccp_close+0xa23/0xd50 [ 46.785124][ T3609] ? dccp_recvmsg+0x9d0/0x9d0 [ 46.789796][ T3609] ? ip_mc_drop_socket+0x16/0x260 [ 46.794832][ T3609] inet_release+0x12e/0x270 [ 46.799361][ T3609] inet6_release+0x4c/0x70 [ 46.803773][ T3609] __sock_release+0xcd/0x280 [ 46.808371][ T3609] sock_close+0x18/0x20 [ 46.812521][ T3609] __fput+0x27c/0xa90 [ 46.816506][ T3609] ? __sock_release+0x280/0x280 [ 46.821369][ T3609] task_work_run+0xdd/0x1a0 [ 46.825876][ T3609] do_exit+0xc39/0x2b60 [ 46.830029][ T3609] ? lock_downgrade+0x6e0/0x6e0 [ 46.834881][ T3609] ? do_raw_spin_lock+0x120/0x2a0 [ 46.839905][ T3609] ? mm_update_next_owner+0x7a0/0x7a0 [ 46.845273][ T3609] ? rwlock_bug.part.0+0x90/0x90 [ 46.850209][ T3609] ? _raw_spin_unlock_irq+0x1f/0x40 [ 46.855406][ T3609] ? _raw_spin_unlock_irq+0x1f/0x40 [ 46.860603][ T3609] do_group_exit+0xd0/0x2a0 [ 46.865118][ T3609] __x64_sys_exit_group+0x3a/0x50 [ 46.870135][ T3609] do_syscall_64+0x35/0xb0 [ 46.874555][ T3609] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 46.880459][ T3609] RIP: 0033:0x7f468a44e639 [ 46.884864][ T3609] Code: Unable to access opcode bytes at RIP 0x7f468a44e60f. [ 46.892213][ T3609] RSP: 002b:00007ffcc541def8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 +++ exited with 0 +++ [ 46.900661][ T3609] RAX: fffffffff