./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor654200669 <...> forked to background, child pid 3184[ 26.110804][ T3185] 8021q: adding VLAN 0 to HW filter on device bond0 no interfaces have a carrier [ 26.129056][ T3185] eql: remember to turn off Van-Jacobson compression on your slave devices Starting sshd: OK syzkaller Warning: Permanently added '10.128.0.247' (ECDSA) to the list of known hosts. execve("./syz-executor654200669", ["./syz-executor654200669"], 0x7ffe8cedc820 /* 10 vars */) = 0 brk(NULL) = 0x555555fef000 brk(0x555555fefc40) = 0x555555fefc40 arch_prctl(ARCH_SET_FS, 0x555555fef300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor654200669", 4096) = 27 brk(0x555556010c40) = 0x555556010c40 brk(0x555556011000) = 0x555556011000 mprotect(0x7f3182a42000, 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, [11], 4) = 0 bind(3, {sa_family=AF_INET6, sin6_port=htons(20000), sin6_flowinfo=htonl(0), inet_pton(AF_INET6, "::", &sin6_addr), sin6_scope_id=0}, 28) = 0 exit_group(0) = ? syzkaller login: [ 48.968108][ T3613] [ 48.970549][ T3613] ============================= [ 48.975421][ T3613] WARNING: suspicious RCU usage [ 48.980278][ T3613] 5.19.0-syzkaller-11980-ge34cfee65ec8 #0 Not tainted [ 48.987057][ T3613] ----------------------------- [ 48.991899][ T3613] include/net/sock.h:592 suspicious rcu_dereference_check() usage! [ 48.999817][ T3613] [ 48.999817][ T3613] other info that might help us debug this: [ 48.999817][ T3613] [ 49.010067][ T3613] [ 49.010067][ T3613] rcu_scheduler_active = 2, debug_locks = 1 [ 49.018154][ T3613] 4 locks held by syz-executor654/3613: [ 49.023715][ T3613] #0: ffff888073b0a610 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: __sock_release+0x86/0x280 [ 49.034287][ T3613] #1: ffffc900014f7ab8 (&table->hash[i].lock){+...}-{2:2}, at: udp_lib_unhash+0x1d5/0x730 [ 49.044380][ T3613] #2: ffffffff8d7bb7b8 (reuseport_lock){+...}-{2:2}, at: reuseport_detach_sock+0x22/0x4a0 [ 49.054445][ T3613] #3: ffff88814b7d2bb8 (clock-AF_INET6){++..}-{2:2}, at: bpf_sk_reuseport_detach+0x26/0x190 [ 49.064701][ T3613] [ 49.064701][ T3613] stack backtrace: [ 49.070591][ T3613] CPU: 1 PID: 3613 Comm: syz-executor654 Not tainted 5.19.0-syzkaller-11980-ge34cfee65ec8 #0 [ 49.080738][ T3613] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 [ 49.090778][ T3613] Call Trace: [ 49.094044][ T3613] [ 49.096973][ T3613] dump_stack_lvl+0xcd/0x134 [ 49.101567][ T3613] bpf_sk_reuseport_detach+0x156/0x190 [ 49.107019][ T3613] reuseport_detach_sock+0x8c/0x4a0 [ 49.112233][ T3613] udp_lib_unhash+0x210/0x730 [ 49.116936][ T3613] ? udpv6_pre_connect+0x180/0x180 [ 49.122037][ T3613] sk_common_release+0xba/0x390 [ 49.126897][ T3613] inet_release+0x12e/0x270 [ 49.131393][ T3613] inet6_release+0x4c/0x70 [ 49.135833][ T3613] __sock_release+0xcd/0x280 [ 49.140424][ T3613] sock_close+0x18/0x20 [ 49.144569][ T3613] __fput+0x277/0x9d0 [ 49.148547][ T3613] ? __sock_release+0x280/0x280 [ 49.153392][ T3613] task_work_run+0xdd/0x1a0 [ 49.157985][ T3613] do_exit+0xad5/0x29b0 [ 49.162142][ T3613] ? mm_update_next_owner+0x7a0/0x7a0 [ 49.167503][ T3613] ? _raw_spin_unlock_irq+0x1f/0x40 [ 49.172700][ T3613] ? _raw_spin_unlock_irq+0x1f/0x40 [ 49.177926][ T3613] do_group_exit+0xd2/0x2f0 [ 49.182458][ T3613] __x64_sys_exit_group+0x3a/0x50 [ 49.187488][ T3613] do_syscall_64+0x35/0xb0 [ 49.191907][ T3613] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 49.197805][ T3613] RIP: 0033:0x7f31829d4679 [ 49.202221][ T3613] Code: Unable to access opcode bytes at RIP 0x7f31829d464f. [ 49.209580][ T3613] RSP: 002b:00007ffc90486a78 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 +++ exited with 0 +++ [ 49.217992][