./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor2491425696 <...> Warning: Permanently added '10.128.1.63' (ECDSA) to the list of known hosts. execve("./syz-executor2491425696", ["./syz-executor2491425696"], 0x7ffdf2f59040 /* 10 vars */) = 0 brk(NULL) = 0x5555566d9000 brk(0x5555566d9c40) = 0x5555566d9c40 arch_prctl(ARCH_SET_FS, 0x5555566d9300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor2491425696", 4096) = 28 brk(0x5555566fac40) = 0x5555566fac40 brk(0x5555566fb000) = 0x5555566fb000 mprotect(0x7f62b5438000, 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|SOCK_CLOEXEC, IPPROTO_IP) = 3 setsockopt(3, SOL_SOCKET, SO_REUSEPORT, [-2147483644], 4) = 0 bind(3, {sa_family=AF_INET6, sin6_port=htons(0), sin6_flowinfo=htonl(0), inet_pton(AF_INET6, "ff01::1", &sin6_addr), sin6_scope_id=8}, 28) = 0 exit_group(0) = ? syzkaller login: [ 49.254977][ T3606] [ 49.257455][ T3606] ============================= [ 49.262326][ T3606] WARNING: suspicious RCU usage [ 49.267159][ T3606] 5.19.0-syzkaller-11980-ge34cfee65ec8 #0 Not tainted [ 49.273927][ T3606] ----------------------------- [ 49.278760][ T3606] include/net/sock.h:592 suspicious rcu_dereference_check() usage! [ 49.286679][ T3606] [ 49.286679][ T3606] other info that might help us debug this: [ 49.286679][ T3606] [ 49.296933][ T3606] [ 49.296933][ T3606] rcu_scheduler_active = 2, debug_locks = 1 [ 49.305024][ T3606] 4 locks held by syz-executor249/3606: [ 49.310600][ T3606] #0: ffff888073d4ca10 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: __sock_release+0x86/0x280 [ 49.321180][ T3606] #1: ffffc900014e0638 (&table->hash[i].lock){+...}-{2:2}, at: udp_lib_unhash+0x1d5/0x730 [ 49.331273][ T3606] #2: ffffffff8d7bb7b8 (reuseport_lock){+...}-{2:2}, at: reuseport_detach_sock+0x22/0x4a0 [ 49.341359][ T3606] #3: ffff88807e2c3bb8 (clock-AF_INET6){++..}-{2:2}, at: bpf_sk_reuseport_detach+0x26/0x190 [ 49.351618][ T3606] [ 49.351618][ T3606] stack backtrace: [ 49.357509][ T3606] CPU: 0 PID: 3606 Comm: syz-executor249 Not tainted 5.19.0-syzkaller-11980-ge34cfee65ec8 #0 [ 49.367664][ T3606] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 [ 49.377716][ T3606] Call Trace: [ 49.380990][ T3606] [ 49.383914][ T3606] dump_stack_lvl+0xcd/0x134 [ 49.388500][ T3606] bpf_sk_reuseport_detach+0x156/0x190 [ 49.393972][ T3606] reuseport_detach_sock+0x8c/0x4a0 [ 49.399170][ T3606] udp_lib_unhash+0x210/0x730 [ 49.403869][ T3606] ? udpv6_pre_connect+0x180/0x180 [ 49.408983][ T3606] sk_common_release+0xba/0x390 [ 49.413830][ T3606] inet_release+0x12e/0x270 [ 49.418333][ T3606] inet6_release+0x4c/0x70 [ 49.422743][ T3606] __sock_release+0xcd/0x280 [ 49.427331][ T3606] sock_close+0x18/0x20 [ 49.431496][ T3606] __fput+0x277/0x9d0 [ 49.435470][ T3606] ? __sock_release+0x280/0x280 [ 49.440313][ T3606] task_work_run+0xdd/0x1a0 [ 49.444810][ T3606] do_exit+0xad5/0x29b0 [ 49.448975][ T3606] ? mm_update_next_owner+0x7a0/0x7a0 [ 49.454337][ T3606] ? _raw_spin_unlock_irq+0x1f/0x40 [ 49.459525][ T3606] ? _raw_spin_unlock_irq+0x1f/0x40 [ 49.464726][ T3606] do_group_exit+0xd2/0x2f0 [ 49.469238][ T3606] __x64_sys_exit_group+0x3a/0x50 [ 49.474269][ T3606] do_syscall_64+0x35/0xb0 [ 49.478693][ T3606] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 49.484608][ T3606] RIP: 0033:0x7f62b53ca6a9 [ 49.489025][ T3606] Code: Unable to access opcode bytes at RIP 0x7f62b53ca67f. [ 49.496384][ T3606] RSP: 002b:00007ffc77c12df8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 +++ exited with 0 +++ [ 49.504798][