./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor153104271 <...> DUID 00:04:60:0b:d9:94:f1:4e:15:d4:cc:23:27:00:18:99:58:ba forked to background, child pid 3185 [ 26.473577][ T3186] 8021q: adding VLAN 0 to HW filter on device bond0 [ 26.485956][ T3186] 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-executor153104271", ["./syz-executor153104271"], 0x7ffe1ad7a4e0 /* 10 vars */) = 0 brk(NULL) = 0x555555e5a000 brk(0x555555e5ac40) = 0x555555e5ac40 arch_prctl(ARCH_SET_FS, 0x555555e5a300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor153104271", 4096) = 27 brk(0x555555e7bc40) = 0x555555e7bc40 brk(0x555555e7c000) = 0x555555e7c000 mprotect(0x7f2ea58a5000, 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, [6], 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: [ 44.218395][ T3606] [ 44.220877][ T3606] ============================= [ 44.225845][ T3606] WARNING: suspicious RCU usage [ 44.230700][ T3606] 5.19.0-syzkaller-11980-ge34cfee65ec8 #0 Not tainted [ 44.237570][ T3606] ----------------------------- [ 44.242439][ T3606] include/net/sock.h:592 suspicious rcu_dereference_check() usage! [ 44.250319][ T3606] [ 44.250319][ T3606] other info that might help us debug this: [ 44.250319][ T3606] [ 44.260592][ T3606] [ 44.260592][ T3606] rcu_scheduler_active = 2, debug_locks = 1 [ 44.268698][ T3606] 4 locks held by syz-executor153/3606: [ 44.274277][ T3606] #0: ffff88801e74e810 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: __sock_release+0x86/0x280 [ 44.284892][ T3606] #1: ffffc900014d77b8 (&table->hash[i].lock){+...}-{2:2}, at: udp_lib_unhash+0x1d5/0x730 [ 44.294937][ T3606] #2: ffffffff8d7bb7b8 (reuseport_lock){+...}-{2:2}, at: reuseport_detach_sock+0x22/0x4a0 [ 44.304995][ T3606] #3: ffff888075f91bb8 (clock-AF_INET6){++..}-{2:2}, at: bpf_sk_reuseport_detach+0x26/0x190 [ 44.315234][ T3606] [ 44.315234][ T3606] stack backtrace: [ 44.321159][ T3606] CPU: 1 PID: 3606 Comm: syz-executor153 Not tainted 5.19.0-syzkaller-11980-ge34cfee65ec8 #0 [ 44.331298][ T3606] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 [ 44.341340][ T3606] Call Trace: [ 44.344622][ T3606] [ 44.347557][ T3606] dump_stack_lvl+0xcd/0x134 [ 44.352163][ T3606] bpf_sk_reuseport_detach+0x156/0x190 [ 44.357719][ T3606] reuseport_detach_sock+0x8c/0x4a0 [ 44.362917][ T3606] udp_lib_unhash+0x210/0x730 [ 44.367605][ T3606] ? udpv6_pre_connect+0x180/0x180 [ 44.372708][ T3606] sk_common_release+0xba/0x390 [ 44.377583][ T3606] inet_release+0x12e/0x270 [ 44.382096][ T3606] inet6_release+0x4c/0x70 [ 44.386519][ T3606] __sock_release+0xcd/0x280 [ 44.391100][ T3606] sock_close+0x18/0x20 [ 44.395248][ T3606] __fput+0x277/0x9d0 [ 44.399222][ T3606] ? __sock_release+0x280/0x280 [ 44.404073][ T3606] task_work_run+0xdd/0x1a0 [ 44.408578][ T3606] do_exit+0xad5/0x29b0 [ 44.412728][ T3606] ? mm_update_next_owner+0x7a0/0x7a0 [ 44.418104][ T3606] ? _raw_spin_unlock_irq+0x1f/0x40 [ 44.423310][ T3606] ? _raw_spin_unlock_irq+0x1f/0x40 [ 44.428502][ T3606] do_group_exit+0xd2/0x2f0 [ 44.433028][ T3606] __x64_sys_exit_group+0x3a/0x50 [ 44.438041][ T3606] do_syscall_64+0x35/0xb0 [ 44.442461][ T3606] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 44.448360][ T3606] RIP: 0033:0x7f2ea5837679 [ 44.452761][ T3606] Code: Unable to access opcode bytes at RIP 0x7f2ea583764f. [ 44.460124][ T3606] RSP: 002b:00007fff16ef3478 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 +++ exited with 0 +++ [ 44.468525]