./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor1082455196 <...> Warning: Permanently added '10.128.1.7' (ED25519) to the list of known hosts. execve("./syz-executor1082455196", ["./syz-executor1082455196"], 0x7ffc8dbcc3c0 /* 10 vars */) = 0 brk(NULL) = 0x5555743b1000 brk(0x5555743b1d00) = 0x5555743b1d00 arch_prctl(ARCH_SET_FS, 0x5555743b1380) = 0 set_tid_address(0x5555743b1650) = 5230 set_robust_list(0x5555743b1660, 24) = 0 rseq(0x5555743b1ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor1082455196", 4096) = 28 getrandom("\x6b\x21\xdf\xbd\x91\x3d\x77\xca", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x5555743b1d00 brk(0x5555743d2d00) = 0x5555743d2d00 brk(0x5555743d3000) = 0x5555743d3000 mprotect(0x7f14c7da9000, 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 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5231 attached , child_tidptr=0x5555743b1650) = 5231 [pid 5231] set_robust_list(0x5555743b1660, 24) = 0 [pid 5231] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5231] setpgid(0, 0) = 0 [pid 5231] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5231] write(3, "1000", 4) = 4 [pid 5231] close(3) = 0 executing program [pid 5231] write(1, "executing program\n", 18) = 18 [pid 5231] bpf(BPF_PROG_LOAD, {prog_type=BPF_PROG_TYPE_UNSPEC, insn_cnt=12, insns=0x20000440, license=NULL, log_level=0, log_size=0, log_buf=NULL, kern_version=KERNEL_VERSION(0, 0, 0), prog_flags=0, prog_name="", prog_ifindex=0, expected_attach_type=BPF_CGROUP_INET_INGRESS, prog_btf_fd=-1, func_info_rec_size=0, func_info=NULL, func_info_cnt=0, line_info_rec_size=0, line_info=NULL, line_info_cnt=4294966948, attach_btf_id=0, attach_prog_fd=0, fd_array=NULL}, 144) = -1 EFAULT (Bad address) [pid 5231] socketpair(AF_TIPC, SOCK_DGRAM, 0, [3, 4]) = 0 [pid 5231] close(3) = 0 [pid 5231] bpf(BPF_MAP_CREATE, {map_type=BPF_MAP_TYPE_LPM_TRIE, key_size=7, value_size=65537, max_entries=8, map_flags=BPF_F_NO_PREALLOC, inner_map_fd=-1, map_name="", map_ifindex=0, btf_fd=-1, btf_key_type_id=0, btf_value_type_id=0, btf_vmlinux_value_type_id=0, map_extra=0}, 72) = 3 [pid 5231] bpf(BPF_PROG_LOAD, {prog_type=BPF_PROG_TYPE_UNSPEC, insn_cnt=12, insns=0x20000440, license=NULL, log_level=0, log_size=0, log_buf=NULL, kern_version=KERNEL_VERSION(0, 0, 0), prog_flags=0, prog_name="", prog_ifindex=0, expected_attach_type=BPF_CGROUP_INET_INGRESS, prog_btf_fd=-1, func_info_rec_size=0, func_info=NULL, func_info_cnt=0, line_info_rec_size=0, line_info=NULL, line_info_cnt=0, attach_btf_id=0, attach_prog_fd=0, fd_array=NULL}, 144) = -1 EFAULT (Bad address) [pid 5231] close(3) = 0 [pid 5231] bpf(BPF_MAP_CREATE, {map_type=BPF_MAP_TYPE_LPM_TRIE, key_size=7, value_size=3983, max_entries=9, map_flags=BPF_F_NO_PREALLOC, inner_map_fd=-1, map_name="", map_ifindex=0, btf_fd=-1, btf_key_type_id=0, btf_value_type_id=0, btf_vmlinux_value_type_id=0, map_extra=0}, 72) = 3 [pid 5231] bpf(BPF_MAP_UPDATE_ELEM, {map_fd=3, key=0x20000340, value=0x20000200, flags=BPF_ANY}, 32) = 0 [pid 5231] bpf(BPF_PROG_LOAD, {prog_type=BPF_PROG_TYPE_RAW_TRACEPOINT, insn_cnt=12, insns=0x20000440, license="GPL", log_level=0, log_size=0, log_buf=NULL, kern_version=KERNEL_VERSION(0, 0, 0), prog_flags=0, prog_name="", prog_ifindex=0, expected_attach_type=BPF_CGROUP_INET_INGRESS, prog_btf_fd=-1, func_info_rec_size=0, func_info=NULL, func_info_cnt=0, line_info_rec_size=0, line_info=NULL, line_info_cnt=0, attach_btf_id=0, attach_prog_fd=0, fd_array=NULL}, 144) = 5 [pid 5231] bpf(BPF_RAW_TRACEPOINT_OPEN, {raw_tracepoint={name="timer_start", prog_fd=5}}, 16) = 6 [ 63.210752][ T5225] [ 63.213114][ T5225] ====================================================== [ 63.220216][ T5225] WARNING: possible circular locking dependency detected [ 63.227499][ T5225] 6.11.0-rc5-syzkaller-00154-g9b0874286768 #0 Not tainted [ 63.234630][ T5225] ------------------------------------------------------ [ 63.242083][ T5225] sshd/5225 is trying to acquire lock: [ 63.247646][ T5225] ffff8880b8829430 (krc.lock){....}-{2:2}, at: kvfree_call_rcu+0x18a/0x790 [ 63.256375][ T5225] [ 63.256375][ T5225] but task is already holding lock: [ 63.263808][ T5225] ffff8880b882a718 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x112/0x240 [ 63.272933][ T5225] [ 63.272933][ T5225] which lock already depends on the new lock. [ 63.272933][ T5225] [ 63.283530][ T5225] [ 63.283530][ T5225] the existing dependency chain (in reverse order) is: [ 63.292808][ T5225] [ 63.292808][ T5225] -> #1 (&base->lock){-.-.}-{2:2}: [ 63.300195][ T5225] lock_acquire+0x1ed/0x550 [ 63.305230][ T5225] _raw_spin_lock_irqsave+0xd5/0x120 [ 63.311037][ T5225] lock_timer_base+0x112/0x240 [ 63.316309][ T5225] __mod_timer+0x1ca/0xeb0 [ 63.321330][ T5225] queue_delayed_work_on+0x1ca/0x390 [ 63.327397][ T5225] kvfree_call_rcu+0x47f/0x790 [ 63.332760][ T5225] pwq_release_workfn+0x6d1/0x860 [ 63.338464][ T5225] kthread_worker_fn+0x500/0xaf0 [ 63.344471][ T5225] kthread+0x2f0/0x390 [ 63.349070][ T5225] ret_from_fork+0x4b/0x80 [ 63.353999][ T5225] ret_from_fork_asm+0x1a/0x30 [ 63.359277][ T5225] [ 63.359277][ T5225] -> #0 (krc.lock){....}-{2:2}: [ 63.366393][ T5225] validate_chain+0x18e0/0x5900 [ 63.371962][ T5225] __lock_acquire+0x137a/0x2040 [ 63.377341][ T5225] lock_acquire+0x1ed/0x550 [ 63.382392][ T5225] _raw_spin_lock+0x2e/0x40 [ 63.387442][ T5225] kvfree_call_rcu+0x18a/0x790 [ 63.392721][ T5225] trie_delete_elem+0x546/0x6a0 [ 63.398113][ T5225] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 63.404264][ T5225] bpf_trace_run2+0x2ec/0x540 [ 63.409455][ T5225] enqueue_timer+0x3ce/0x570 [ 63.414566][ T5225] __mod_timer+0x953/0xeb0 [ 63.419510][ T5225] sk_reset_timer+0x23/0xc0 [ 63.424527][ T5225] tcp_schedule_loss_probe+0x448/0x590 [ 63.430495][ T5225] tcp_write_xmit+0x4308/0x6a10 [ 63.435884][ T5225] __tcp_push_pending_frames+0x9b/0x360 [ 63.442026][ T5225] tcp_sendmsg_locked+0x43b1/0x4e10 [ 63.447737][ T5225] tcp_sendmsg+0x30/0x50 [ 63.452591][ T5225] __sock_sendmsg+0x1a6/0x270 [ 63.458151][ T5225] sock_write_iter+0x2dd/0x400 [ 63.463460][ T5225] vfs_write+0xa72/0xc90 [ 63.468749][ T5225] ksys_write+0x1a0/0x2c0 [ 63.473595][ T5225] do_syscall_64+0xf3/0x230 [ 63.478604][ T5225] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 63.485113][ T5225] [ 63.485113][ T5225] other info that might help us debug this: [ 63.485113][ T5225] [ 63.495764][ T5225] Possible unsafe locking scenario: [ 63.495764][ T5225] [ 63.503283][ T5225] CPU0 CPU1 [ 63.508633][ T5225] ---- ---- [ 63.513981][ T5225] lock(&base->lock); [ 63.518124][ T5225] lock(krc.lock); [ 63.524436][ T5225] lock(&base->lock); [ 63.531009][ T5225] lock(krc.lock); [ 63.534808][ T5225] [ 63.534808][ T5225] *** DEADLOCK *** [ 63.534808][ T5225] [ 63.542938][ T5225] 3 locks held by sshd/5225: [ 63.547516][ T5225] #0: ffff88807e132718 (sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_sendmsg+0x22/0x50 [ 63.556647][ T5225] #1: ffff8880b882a718 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x112/0x240 [ 63.565966][ T5225] #2: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x1fc/0x540 [ 63.575374][ T5225] [ 63.575374][ T5225] stack backtrace: [ 63.581279][ T5225] CPU: 0 UID: 0 PID: 5225 Comm: sshd Not tainted 6.11.0-rc5-syzkaller-00154-g9b0874286768 #0 [ 63.591454][ T5225] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 [ 63.601510][ T5225] Call Trace: [ 63.604792][ T5225] [ 63.607713][ T5225] dump_stack_lvl+0x241/0x360 [ 63.612392][ T5225] ? __pfx_dump_stack_lvl+0x10/0x10 [ 63.617584][ T5225] ? print_circular_bug+0x130/0x1a0 [ 63.622776][ T5225] check_noncircular+0x36a/0x4a0 [ 63.627703][ T5225] ? __pfx_check_noncircular+0x10/0x10 [ 63.633147][ T5225] ? lockdep_lock+0x123/0x2b0 [ 63.637812][ T5225] ? mark_lock+0x9a/0x350 [ 63.642136][ T5225] validate_chain+0x18e0/0x5900 [ 63.646981][ T5225] ? __pfx_validate_chain+0x10/0x10 [ 63.652162][ T5225] ? stack_depot_save_flags+0x6e4/0x830 [ 63.657724][ T5225] ? do_raw_spin_lock+0x14f/0x370 [ 63.662739][ T5225] ? __pfx_lock_release+0x10/0x10 [ 63.667754][ T5225] ? do_raw_spin_unlock+0x13c/0x8b0 [ 63.672942][ T5225] ? _raw_spin_unlock_irqrestore+0xdd/0x140 [ 63.678825][ T5225] ? __pfx__raw_spin_unlock_irqrestore+0x10/0x10 [ 63.685144][ T5225] ? stack_trace_save+0x118/0x1d0 [ 63.690249][ T5225] ? mark_lock+0x9a/0x350 [ 63.694577][ T5225] __lock_acquire+0x137a/0x2040 [ 63.699428][ T5225] lock_acquire+0x1ed/0x550 [ 63.703946][ T5225] ? kvfree_call_rcu+0x18a/0x790 [ 63.708918][ T5225] ? __pfx_lock_acquire+0x10/0x10 [ 63.714044][ T5225] ? __phys_addr+0xba/0x170 [ 63.718592][ T5225] _raw_spin_lock+0x2e/0x40 [ 63.723094][ T5225] ? kvfree_call_rcu+0x18a/0x790 [ 63.728023][ T5225] kvfree_call_rcu+0x18a/0x790 [ 63.732778][ T5225] ? _raw_spin_unlock_irqrestore+0xdd/0x140 [ 63.738691][ T5225] ? __pfx_kvfree_call_rcu+0x10/0x10 [ 63.743968][ T5225] ? longest_prefix_match+0x49f/0x650 [ 63.749337][ T5225] trie_delete_elem+0x546/0x6a0 [ 63.754188][ T5225] ? bpf_trace_run2+0x1fc/0x540 [ 63.759030][ T5225] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 63.764476][ T5225] bpf_trace_run2+0x2ec/0x540 [ 63.769145][ T5225] ? __pfx_bpf_trace_run2+0x10/0x10 [ 63.774333][ T5225] ? __pfx_debug_object_activate+0x10/0x10 [ 63.780141][ T5225] enqueue_timer+0x3ce/0x570 [ 63.784725][ T5225] __mod_timer+0x953/0xeb0 [ 63.789134][ T5225] ? __pfx___mod_timer+0x10/0x10 [ 63.794059][ T5225] ? ktime_get+0x3c/0xb0 [ 63.798294][ T5225] ? __asan_memset+0x23/0x50 [ 63.802963][ T5225] sk_reset_timer+0x23/0xc0 [ 63.807551][ T5225] tcp_schedule_loss_probe+0x448/0x590 [ 63.813095][ T5225] tcp_write_xmit+0x4308/0x6a10 [ 63.817965][ T5225] ? __virt_addr_valid+0x183/0x530 [ 63.823103][ T5225] ? __alloc_skb+0x2d5/0x440 [ 63.827987][ T5225] __tcp_push_pending_frames+0x9b/0x360 [ 63.833544][ T5225] tcp_sendmsg_locked+0x43b1/0x4e10 [ 63.838754][ T5225] ? __pfx_tcp_sendmsg_locked+0x10/0x10 [ 63.844288][ T5225] ? __local_bh_enable_ip+0x168/0x200 [ 63.849653][ T5225] ? do_raw_spin_unlock+0x13c/0x8b0 [ 63.854843][ T5225] tcp_sendmsg+0x30/0x50 [ 63.859073][ T5225] __sock_sendmsg+0x1a6/0x270 [ 63.863747][ T5225] sock_write_iter+0x2dd/0x400 [ 63.868502][ T5225] ? __pfx_sock_write_iter+0x10/0x10 [ 63.873808][ T5225] ? bpf_lsm_file_permission+0x9/0x10 [ 63.879217][ T5225] ? security_file_permission+0x7f/0xa0 [ 63.884776][ T5225] vfs_write+0xa72/0xc90 [ 63.889033][ T5225] ? __pfx_sock_write_iter+0x10/0x10 [ 63.894311][ T5225] ? __pfx_vfs_write+0x10/0x10 [ 63.899060][ T5225] ? __set_current_blocked+0x310/0x380 [ 63.904542][ T5225] ? __might_fault+0xc6/0x120 [ 63.909258][ T5225] ksys_write+0x1a0/0x2c0 [ 63.913594][ T5225] ? __pfx_ksys_write+0x10/0x10 [ 63.918441][ T5225] ? do_syscall_64+0x100/0x230 [ 63.923201][ T5225] ? do_syscall_64+0xb6/0x230 [ 63.927952][ T5225] do_syscall_64+0xf3/0x230 [ 63.932568][ T5225] ? clear_bhb_loop+0x35/0x90 [ 63.937371][ T5225] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 63.943669][ T5225] RIP: 0033:0x7f0b26316bf2 [ 63.948107][ T5225] Code: 89 c7 48 89 44 24 08 e8 7b 34 fa ff 48 8b 44 24 08 48 83 c4 28 c3 c3 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 6f 48 8b 15 07 a2 0d 00 f7 d8 64 89 02 48 83 [ 63.967728][ T5225] RSP: 002b:00007ffd37923b68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 63.976422][ T5225] RAX: ffffffffffffffda RBX: 000000000000002c RCX: 00007f0b26316bf2 [ 63.985186][ T5225] RDX: 000000000000002c RSI: 000055b0691f5960 RDI: 0000000000000004 [ 63.993349][ T5225] RBP: 000055b0691fede0 R08: 0000000000000000 R09: 0000000000000000 [ 64.001485][ T5225] R10: 0000000000000000 R11: 0000000000000246 R12: 000055b02f2c5aa4 [ 64.009467][ T5225] R13: 000000000000003f R14: 000055b02f2c63e8 R15: 00007ffd37923bd8 [ 64.017442][ T5225]