./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor3339959980 <...> Warning: Permanently added '10.128.1.200' (ED25519) to the list of known hosts. execve("./syz-executor3339959980", ["./syz-executor3339959980"], 0x7ffc4dc06080 /* 10 vars */) = 0 brk(NULL) = 0x555594dfb000 brk(0x555594dfbd00) = 0x555594dfbd00 arch_prctl(ARCH_SET_FS, 0x555594dfb380) = 0 set_tid_address(0x555594dfb650) = 5841 set_robust_list(0x555594dfb660, 24) = 0 rseq(0x555594dfbca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor3339959980", 4096) = 28 getrandom("\x55\xbf\xe6\xc6\xe2\x11\x10\x34", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555594dfbd00 brk(0x555594e1cd00) = 0x555594e1cd00 brk(0x555594e1d000) = 0x555594e1d000 mprotect(0x7f467e7cf000, 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 5842 attached [pid 5842] set_robust_list(0x555594dfb660, 24 [pid 5841] <... clone resumed>, child_tidptr=0x555594dfb650) = 5842 [pid 5842] <... set_robust_list resumed>) = 0 [pid 5842] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5842] setpgid(0, 0) = 0 [pid 5842] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5842] write(3, "1000", 4) = 4 [pid 5842] close(3) = 0 executing program [pid 5842] write(1, "executing program\n", 18) = 18 [pid 5842] 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 5842] socketpair(AF_TIPC, SOCK_DGRAM, 0, [3, 4]) = 0 [pid 5842] close(3) = 0 [pid 5842] 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 5842] 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 5842] close(3) = 0 [pid 5842] 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 5842] bpf(BPF_MAP_UPDATE_ELEM, {map_fd=3, key=0x20000340, value=0x20000200, flags=BPF_ANY}, 32) = 0 [pid 5842] 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 5842] bpf(BPF_RAW_TRACEPOINT_OPEN, {raw_tracepoint={name="timer_start", prog_fd=5}}, 16) = 6 [ 58.959745][ T5836] [ 58.962125][ T5836] ====================================================== [ 58.969130][ T5836] WARNING: possible circular locking dependency detected [ 58.976136][ T5836] 6.12.0-rc6-syzkaller-01236-gcf6d9fe09185 #0 Not tainted [ 58.983218][ T5836] ------------------------------------------------------ [ 58.990211][ T5836] sshd/5836 is trying to acquire lock: [ 58.995648][ T5836] ffff8880b8629430 (krc.lock){....}-{2:2}, at: kvfree_call_rcu+0x18a/0x790 [ 59.004263][ T5836] [ 59.004263][ T5836] but task is already holding lock: [ 59.011599][ T5836] ffff8880b862a718 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x744/0xeb0 [ 59.020097][ T5836] [ 59.020097][ T5836] which lock already depends on the new lock. [ 59.020097][ T5836] [ 59.030485][ T5836] [ 59.030485][ T5836] the existing dependency chain (in reverse order) is: [ 59.039491][ T5836] [ 59.039491][ T5836] -> #1 (&base->lock){-.-.}-{2:2}: [ 59.046778][ T5836] lock_acquire+0x1ed/0x550 [ 59.051799][ T5836] _raw_spin_lock_irqsave+0xd5/0x120 [ 59.057597][ T5836] lock_timer_base+0x112/0x240 [ 59.062880][ T5836] __mod_timer+0x1ca/0xeb0 [ 59.068231][ T5836] queue_delayed_work_on+0x1ca/0x390 [ 59.074018][ T5836] kvfree_call_rcu+0x47f/0x790 [ 59.079280][ T5836] pwq_release_workfn+0x664/0x800 [ 59.084806][ T5836] kthread_worker_fn+0x500/0xb70 [ 59.090245][ T5836] kthread+0x2f0/0x390 [ 59.094809][ T5836] ret_from_fork+0x4b/0x80 [ 59.099724][ T5836] ret_from_fork_asm+0x1a/0x30 [ 59.104987][ T5836] [ 59.104987][ T5836] -> #0 (krc.lock){....}-{2:2}: [ 59.112011][ T5836] validate_chain+0x18ef/0x5920 [ 59.117361][ T5836] __lock_acquire+0x1384/0x2050 [ 59.122712][ T5836] lock_acquire+0x1ed/0x550 [ 59.127717][ T5836] _raw_spin_lock+0x2e/0x40 [ 59.132725][ T5836] kvfree_call_rcu+0x18a/0x790 [ 59.137984][ T5836] trie_delete_elem+0x546/0x6a0 [ 59.143338][ T5836] bpf_prog_2c29ac5cdc6b1842+0x43/0x47 [ 59.149304][ T5836] bpf_trace_run2+0x2ec/0x540 [ 59.154481][ T5836] enqueue_timer+0x3ce/0x570 [ 59.159572][ T5836] __mod_timer+0x953/0xeb0 [ 59.164500][ T5836] sk_reset_timer+0x23/0xc0 [ 59.169504][ T5836] tcp_event_new_data_sent+0x203/0x360 [ 59.175471][ T5836] tcp_write_xmit+0x17d8/0x6bf0 [ 59.180816][ T5836] __tcp_push_pending_frames+0x9b/0x360 [ 59.186944][ T5836] tcp_sendmsg_locked+0x44d6/0x4f30 [ 59.192640][ T5836] tcp_sendmsg+0x30/0x50 [ 59.197384][ T5836] __sock_sendmsg+0x1a6/0x270 [ 59.202557][ T5836] sock_write_iter+0x2d7/0x3f0 [ 59.207816][ T5836] vfs_write+0xaeb/0xd30 [ 59.212553][ T5836] ksys_write+0x183/0x2b0 [ 59.217378][ T5836] do_syscall_64+0xf3/0x230 [ 59.222380][ T5836] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 59.228789][ T5836] [ 59.228789][ T5836] other info that might help us debug this: [ 59.228789][ T5836] [ 59.239009][ T5836] Possible unsafe locking scenario: [ 59.239009][ T5836] [ 59.246535][ T5836] CPU0 CPU1 [ 59.251881][ T5836] ---- ---- [ 59.257237][ T5836] lock(&base->lock); [ 59.261289][ T5836] lock(krc.lock); [ 59.267594][ T5836] lock(&base->lock); [ 59.274163][ T5836] lock(krc.lock); [ 59.277948][ T5836] [ 59.277948][ T5836] *** DEADLOCK *** [ 59.277948][ T5836] [ 59.286159][ T5836] 3 locks held by sshd/5836: [ 59.290737][ T5836] #0: ffff888025139bd8 (sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_sendmsg+0x22/0x50 [ 59.299857][ T5836] #1: ffff8880b862a718 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x744/0xeb0 [ 59.308795][ T5836] #2: ffffffff8e937da0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x1fc/0x540 [ 59.318167][ T5836] [ 59.318167][ T5836] stack backtrace: [ 59.324050][ T5836] CPU: 0 UID: 0 PID: 5836 Comm: sshd Not tainted 6.12.0-rc6-syzkaller-01236-gcf6d9fe09185 #0 [ 59.334203][ T5836] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 [ 59.344242][ T5836] Call Trace: [ 59.347504][ T5836] [ 59.350433][ T5836] dump_stack_lvl+0x241/0x360 [ 59.355094][ T5836] ? __pfx_dump_stack_lvl+0x10/0x10 [ 59.360270][ T5836] ? __pfx__printk+0x10/0x10 [ 59.364844][ T5836] print_circular_bug+0x13a/0x1b0 [ 59.369848][ T5836] check_noncircular+0x36a/0x4a0 [ 59.374762][ T5836] ? __pfx_check_noncircular+0x10/0x10 [ 59.380217][ T5836] ? lockdep_lock+0x123/0x2b0 [ 59.384876][ T5836] ? mark_lock+0x9a/0x360 [ 59.389184][ T5836] validate_chain+0x18ef/0x5920 [ 59.394023][ T5836] ? __pfx_validate_chain+0x10/0x10 [ 59.399202][ T5836] ? stack_depot_save_flags+0x6e4/0x830 [ 59.404748][ T5836] ? do_raw_spin_lock+0x14f/0x370 [ 59.409766][ T5836] ? __pfx_lock_release+0x10/0x10 [ 59.414811][ T5836] ? do_raw_spin_unlock+0x13c/0x8b0 [ 59.420002][ T5836] ? _raw_spin_unlock_irqrestore+0xdd/0x140 [ 59.425885][ T5836] ? __pfx__raw_spin_unlock_irqrestore+0x10/0x10 [ 59.432196][ T5836] ? stack_trace_save+0x118/0x1d0 [ 59.437206][ T5836] ? mark_lock+0x9a/0x360 [ 59.441517][ T5836] __lock_acquire+0x1384/0x2050 [ 59.446366][ T5836] lock_acquire+0x1ed/0x550 [ 59.450866][ T5836] ? kvfree_call_rcu+0x18a/0x790 [ 59.455793][ T5836] ? __pfx_lock_acquire+0x10/0x10 [ 59.460822][ T5836] ? __phys_addr+0xba/0x170 [ 59.465350][ T5836] _raw_spin_lock+0x2e/0x40 [ 59.469847][ T5836] ? kvfree_call_rcu+0x18a/0x790 [ 59.474771][ T5836] kvfree_call_rcu+0x18a/0x790 [ 59.479517][ T5836] ? _raw_spin_unlock_irqrestore+0xdd/0x140 [ 59.485396][ T5836] ? __pfx_kvfree_call_rcu+0x10/0x10 [ 59.490662][ T5836] ? longest_prefix_match+0x49f/0x650 [ 59.496037][ T5836] trie_delete_elem+0x546/0x6a0 [ 59.500874][ T5836] ? bpf_trace_run2+0x1fc/0x540 [ 59.505709][ T5836] bpf_prog_2c29ac5cdc6b1842+0x43/0x47 [ 59.511162][ T5836] bpf_trace_run2+0x2ec/0x540 [ 59.515831][ T5836] ? __pfx_bpf_trace_run2+0x10/0x10 [ 59.521065][ T5836] ? __pfx_debug_object_activate+0x10/0x10 [ 59.526858][ T5836] ? __pfx_do_raw_spin_lock+0x10/0x10 [ 59.532223][ T5836] enqueue_timer+0x3ce/0x570 [ 59.536805][ T5836] __mod_timer+0x953/0xeb0 [ 59.541206][ T5836] ? __pfx___mod_timer+0x10/0x10 [ 59.546132][ T5836] ? ktime_get+0x3c/0xb0 [ 59.550362][ T5836] ? __asan_memset+0x23/0x50 [ 59.554939][ T5836] sk_reset_timer+0x23/0xc0 [ 59.559424][ T5836] tcp_event_new_data_sent+0x203/0x360 [ 59.564867][ T5836] tcp_write_xmit+0x17d8/0x6bf0 [ 59.569701][ T5836] ? __alloc_skb+0x2d5/0x440 [ 59.574273][ T5836] ? __virt_addr_valid+0x183/0x530 [ 59.579379][ T5836] __tcp_push_pending_frames+0x9b/0x360 [ 59.584905][ T5836] tcp_sendmsg_locked+0x44d6/0x4f30 [ 59.590085][ T5836] ? mark_lock+0x9a/0x360 [ 59.594400][ T5836] ? __pfx_tcp_sendmsg_locked+0x10/0x10 [ 59.599927][ T5836] ? tcp_sendmsg+0x22/0x50 [ 59.604327][ T5836] ? do_raw_spin_unlock+0x13c/0x8b0 [ 59.609509][ T5836] tcp_sendmsg+0x30/0x50 [ 59.613731][ T5836] __sock_sendmsg+0x1a6/0x270 [ 59.618387][ T5836] sock_write_iter+0x2d7/0x3f0 [ 59.623137][ T5836] ? __pfx_sock_write_iter+0x10/0x10 [ 59.628405][ T5836] ? bpf_lsm_file_permission+0x9/0x10 [ 59.633756][ T5836] ? security_file_permission+0x74/0x280 [ 59.639393][ T5836] vfs_write+0xaeb/0xd30 [ 59.643616][ T5836] ? __pfx_sock_write_iter+0x10/0x10 [ 59.648877][ T5836] ? __pfx_vfs_write+0x10/0x10 [ 59.653634][ T5836] ? __might_fault+0xaa/0x120 [ 59.658316][ T5836] ? _copy_to_user+0x8b/0xb0 [ 59.662888][ T5836] ? fdget_pos+0x19a/0x320 [ 59.667287][ T5836] ksys_write+0x183/0x2b0 [ 59.671592][ T5836] ? __pfx_ksys_write+0x10/0x10 [ 59.676422][ T5836] ? do_syscall_64+0x100/0x230 [ 59.681164][ T5836] ? do_syscall_64+0xb6/0x230 [ 59.685819][ T5836] do_syscall_64+0xf3/0x230 [ 59.690316][ T5836] ? clear_bhb_loop+0x35/0x90 [ 59.694991][ T5836] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 59.700898][ T5836] RIP: 0033:0x7f7cd8316bf2 [ 59.705307][ T5836] 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 [ 59.724911][ T5836] RSP: 002b:00007ffc4d3150d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 59.733311][ T5836] RAX: ffffffffffffffda RBX: 000000000000002c RCX: 00007f7cd8316bf2 [ 59.741266][ T5836] RDX: 000000000000002c RSI: 0000557f5db08990 RDI: 0000000000000004 [ 59.749220][ T5836] RBP: 0000557f5db112b0 R08: 0000000000000000 R09: 0000000000000000 [ 59.757188][ T5836] R10: 0000000000000000 R11: 0000000000000246 R12: 0000557f2f11eaa4 [ 59.765160][ T5836] R13: 000000000000003a R14: 0000557f2f11f3e8 R15: 00007ffc4d315148 [ 59.773141][ T5836]