./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor794408565 <...> Warning: Permanently added '10.128.0.143' (ECDSA) to the list of known hosts. execve("./syz-executor794408565", ["./syz-executor794408565"], 0x7ffec1c98b50 /* 10 vars */) = 0 brk(NULL) = 0x555556b17000 brk(0x555556b17c40) = 0x555556b17c40 arch_prctl(ARCH_SET_FS, 0x555556b17300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor794408565", 4096) = 27 brk(0x555556b38c40) = 0x555556b38c40 brk(0x555556b39000) = 0x555556b39000 mprotect(0x7f8e4556a000, 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_INET, SOCK_STREAM, IPPROTO_IP) = 3 setsockopt(3, SOL_SOCKET, SO_REUSEPORT, [-121], 4) = 0 listen(3, 0) = 0 exit_group(0) = ? syzkaller login: [ 48.638013][ T3614] [ 48.640458][ T3614] ============================= [ 48.645334][ T3614] WARNING: suspicious RCU usage [ 48.650185][ T3614] 6.0.0-rc1-next-20220818-syzkaller #0 Not tainted [ 48.656715][ T3614] ----------------------------- [ 48.661560][ T3614] include/net/sock.h:592 suspicious rcu_dereference_check() usage! [ 48.669499][ T3614] [ 48.669499][ T3614] other info that might help us debug this: [ 48.669499][ T3614] [ 48.679755][ T3614] [ 48.679755][ T3614] rcu_scheduler_active = 2, debug_locks = 1 [ 48.687841][ T3614] 5 locks held by syz-executor794/3614: [ 48.693406][ T3614] #0: ffff888076f79a10 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: __sock_release+0x86/0x280 [ 48.703985][ T3614] #1: ffff8880200c8130 (sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_close+0x1e/0xc0 [ 48.713013][ T3614] #2: ffffc9000133de48 (&h->lhash2[i].lock){+.+.}-{2:2}, at: inet_unhash+0x345/0x680 [ 48.722619][ T3614] #3: ffffffff8d7beb78 (reuseport_lock){+...}-{2:2}, at: reuseport_detach_sock+0x22/0x4a0 [ 48.732712][ T3614] #4: ffff8880200c83b8 (clock-AF_INET){++..}-{2:2}, at: bpf_sk_reuseport_detach+0x26/0x190 [ 48.742841][ T3614] [ 48.742841][ T3614] stack backtrace: [ 48.748730][ T3614] CPU: 0 PID: 3614 Comm: syz-executor794 Not tainted 6.0.0-rc1-next-20220818-syzkaller #0 [ 48.758604][ T3614] syz-executor794[3614] cmdline: a [ 48.764390][ T3614] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 [ 48.774428][ T3614] Call Trace: [ 48.777706][ T3614] [ 48.780643][ T3614] dump_stack_lvl+0xcd/0x134 [ 48.785232][ T3614] bpf_sk_reuseport_detach+0x156/0x190 [ 48.790707][ T3614] reuseport_detach_sock+0x8c/0x4a0 [ 48.795905][ T3614] reuseport_stop_listen_sock+0x6d/0x500 [ 48.801536][ T3614] inet_unhash+0x3b1/0x680 [ 48.805958][ T3614] tcp_set_state+0x198/0x7e0 [ 48.810545][ T3614] ? tcp_wmem_schedule+0x210/0x210 [ 48.815650][ T3614] ? find_held_lock+0x2d/0x110 [ 48.820404][ T3614] ? tcp_close+0x1e/0xc0 [ 48.824645][ T3614] __tcp_close+0xbfd/0xf50 [ 48.829067][ T3614] tcp_close+0x29/0xc0 [ 48.833135][ T3614] inet_release+0x12e/0x270 [ 48.837645][ T3614] __sock_release+0xcd/0x280 [ 48.842235][ T3614] sock_close+0x18/0x20 [ 48.846381][ T3614] __fput+0x27c/0xa90 [ 48.850356][ T3614] ? __sock_release+0x280/0x280 [ 48.855203][ T3614] task_work_run+0xdd/0x1a0 [ 48.859705][ T3614] do_exit+0xc39/0x2b60 [ 48.863860][ T3614] ? lock_downgrade+0x6e0/0x6e0 [ 48.868709][ T3614] ? do_raw_spin_lock+0x120/0x2a0 [ 48.873726][ T3614] ? mm_update_next_owner+0x7a0/0x7a0 [ 48.879085][ T3614] ? rwlock_bug.part.0+0x90/0x90 [ 48.884015][ T3614] ? _raw_spin_unlock_irq+0x1f/0x40 [ 48.889288][ T3614] ? _raw_spin_unlock_irq+0x1f/0x40 [ 48.894478][ T3614] do_group_exit+0xd0/0x2a0 [ 48.898984][ T3614] __x64_sys_exit_group+0x3a/0x50 [ 48.903997][ T3614] do_syscall_64+0x35/0xb0 [ 48.908407][ T3614] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 48.914288][ T3614] RIP: 0033:0x7f8e454fc639 [ 48.918699][ T3614] Code: Unable to access opcode bytes at RIP 0x7f8e454fc60f. [ 48.926046][ T3614] RSP: 002b:00007ffef7491418 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 +++ exited with 0 +++ [ 48.934449][ T3614] RAX: ffffffffffffffda RBX: 00007f8e