./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor1818898863 <...> Warning: Permanently added '10.128.1.106' (ED25519) to the list of known hosts. execve("./syz-executor1818898863", ["./syz-executor1818898863"], 0x7ffc42501330 /* 10 vars */) = 0 brk(NULL) = 0x55558422f000 brk(0x55558422fd00) = 0x55558422fd00 arch_prctl(ARCH_SET_FS, 0x55558422f380) = 0 set_tid_address(0x55558422f650) = 5236 set_robust_list(0x55558422f660, 24) = 0 rseq(0x55558422fca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor1818898863", 4096) = 28 getrandom("\x68\xac\xc9\x55\x7f\xcd\x6c\xe3", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55558422fd00 brk(0x555584250d00) = 0x555584250d00 brk(0x555584251000) = 0x555584251000 mprotect(0x7f52190ac000, 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 5237 attached [pid 5237] set_robust_list(0x55558422f660, 24 [pid 5236] <... clone resumed>, child_tidptr=0x55558422f650) = 5237 [pid 5237] <... set_robust_list resumed>) = 0 [pid 5237] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5237] setpgid(0, 0) = 0 [pid 5237] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5237] write(3, "1000", 4) = 4 [pid 5237] close(3) = 0 [pid 5237] write(1, "executing program\n", 18executing program ) = 18 [pid 5237] 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 5237] socketpair(AF_TIPC, SOCK_DGRAM, 0, [3, 4]) = 0 [pid 5237] close(3) = 0 [pid 5237] 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 5237] 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 5237] close(3) = 0 [pid 5237] 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 5237] bpf(BPF_MAP_UPDATE_ELEM, {map_fd=3, key=0x20000340, value=0x20000200, flags=BPF_ANY}, 32) = 0 [pid 5237] 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 5237] bpf(BPF_RAW_TRACEPOINT_OPEN, {raw_tracepoint={name="timer_start", prog_fd=5}}, 16) = 6 [ 81.252279][ T5231] [ 81.254671][ T5231] ====================================================== [ 81.261697][ T5231] WARNING: possible circular locking dependency detected [ 81.268904][ T5231] 6.11.0-rc5-syzkaller-00155-ga3c1e45156ad #0 Not tainted [ 81.276058][ T5231] ------------------------------------------------------ [ 81.283099][ T5231] sshd/5231 is trying to acquire lock: [ 81.288670][ T5231] ffff8880b8829430 (krc.lock){....}-{2:2}, at: kvfree_call_rcu+0x18a/0x790 [ 81.297534][ T5231] [ 81.297534][ T5231] but task is already holding lock: [ 81.305008][ T5231] ffff8880b882a718 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x744/0xeb0 [ 81.313663][ T5231] [ 81.313663][ T5231] which lock already depends on the new lock. [ 81.313663][ T5231] [ 81.324336][ T5231] [ 81.324336][ T5231] the existing dependency chain (in reverse order) is: [ 81.333632][ T5231] [ 81.333632][ T5231] -> #1 (&base->lock){-.-.}-{2:2}: [ 81.341869][ T5231] lock_acquire+0x1ed/0x550 [ 81.347139][ T5231] _raw_spin_lock_irqsave+0xd5/0x120 [ 81.353020][ T5231] lock_timer_base+0x112/0x240 [ 81.358365][ T5231] __mod_timer+0x1ca/0xeb0 [ 81.363437][ T5231] queue_delayed_work_on+0x1ca/0x390 [ 81.369266][ T5231] kvfree_call_rcu+0x47f/0x790 [ 81.374567][ T5231] pwq_release_workfn+0x6d1/0x860 [ 81.380129][ T5231] kthread_worker_fn+0x500/0xaf0 [ 81.385670][ T5231] kthread+0x2f0/0x390 [ 81.390322][ T5231] ret_from_fork+0x4b/0x80 [ 81.395311][ T5231] ret_from_fork_asm+0x1a/0x30 [ 81.400613][ T5231] [ 81.400613][ T5231] -> #0 (krc.lock){....}-{2:2}: [ 81.407656][ T5231] validate_chain+0x18e0/0x5900 [ 81.413036][ T5231] __lock_acquire+0x137a/0x2040 [ 81.418447][ T5231] lock_acquire+0x1ed/0x550 [ 81.423597][ T5231] _raw_spin_lock+0x2e/0x40 [ 81.428654][ T5231] kvfree_call_rcu+0x18a/0x790 [ 81.433970][ T5231] trie_delete_elem+0x546/0x6a0 [ 81.439351][ T5231] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 81.445404][ T5231] bpf_trace_run2+0x2ec/0x540 [ 81.450628][ T5231] enqueue_timer+0x3ce/0x570 [ 81.455752][ T5231] __mod_timer+0xa0e/0xeb0 [ 81.460694][ T5231] sk_reset_timer+0x23/0xc0 [ 81.465904][ T5231] tcp_event_new_data_sent+0x203/0x360 [ 81.471981][ T5231] tcp_write_xmit+0x18dc/0x6a10 [ 81.477397][ T5231] __tcp_push_pending_frames+0x9b/0x360 [ 81.483541][ T5231] tcp_sendmsg_locked+0x43b1/0x4e10 [ 81.489285][ T5231] tcp_sendmsg+0x30/0x50 [ 81.494139][ T5231] __sock_sendmsg+0x1a6/0x270 [ 81.499350][ T5231] sock_write_iter+0x2dd/0x400 [ 81.504659][ T5231] vfs_write+0xa72/0xc90 [ 81.509426][ T5231] ksys_write+0x1a0/0x2c0 [ 81.514316][ T5231] do_syscall_64+0xf3/0x230 [ 81.519341][ T5231] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 81.525776][ T5231] [ 81.525776][ T5231] other info that might help us debug this: [ 81.525776][ T5231] [ 81.536109][ T5231] Possible unsafe locking scenario: [ 81.536109][ T5231] [ 81.543607][ T5231] CPU0 CPU1 [ 81.548971][ T5231] ---- ---- [ 81.554365][ T5231] lock(&base->lock); [ 81.558626][ T5231] lock(krc.lock); [ 81.565017][ T5231] lock(&base->lock); [ 81.571841][ T5231] lock(krc.lock); [ 81.575659][ T5231] [ 81.575659][ T5231] *** DEADLOCK *** [ 81.575659][ T5231] [ 81.583887][ T5231] 3 locks held by sshd/5231: [ 81.589182][ T5231] #0: ffff88807eb7b358 (sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_sendmsg+0x22/0x50 [ 81.598443][ T5231] #1: ffff8880b882a718 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x744/0xeb0 [ 81.607608][ T5231] #2: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x1fc/0x540 [ 81.617292][ T5231] [ 81.617292][ T5231] stack backtrace: [ 81.623186][ T5231] CPU: 0 UID: 0 PID: 5231 Comm: sshd Not tainted 6.11.0-rc5-syzkaller-00155-ga3c1e45156ad #0 [ 81.633514][ T5231] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 [ 81.643711][ T5231] Call Trace: [ 81.647011][ T5231] [ 81.650048][ T5231] dump_stack_lvl+0x241/0x360 [ 81.654836][ T5231] ? __pfx_dump_stack_lvl+0x10/0x10 [ 81.660154][ T5231] ? print_circular_bug+0x130/0x1a0 [ 81.665368][ T5231] check_noncircular+0x36a/0x4a0 [ 81.670439][ T5231] ? __pfx_check_noncircular+0x10/0x10 [ 81.676117][ T5231] ? lockdep_lock+0x123/0x2b0 [ 81.680907][ T5231] ? mark_lock+0x9a/0x350 [ 81.685279][ T5231] validate_chain+0x18e0/0x5900 [ 81.690171][ T5231] ? __pfx_validate_chain+0x10/0x10 [ 81.695488][ T5231] ? stack_depot_save_flags+0x6e4/0x830 [ 81.701064][ T5231] ? do_raw_spin_lock+0x14f/0x370 [ 81.706211][ T5231] ? __pfx_lock_release+0x10/0x10 [ 81.711353][ T5231] ? do_raw_spin_unlock+0x13c/0x8b0 [ 81.717165][ T5231] ? _raw_spin_unlock_irqrestore+0xdd/0x140 [ 81.723373][ T5231] ? __pfx__raw_spin_unlock_irqrestore+0x10/0x10 [ 81.729901][ T5231] ? stack_trace_save+0x118/0x1d0 [ 81.734957][ T5231] ? mark_lock+0x9a/0x350 [ 81.739336][ T5231] __lock_acquire+0x137a/0x2040 [ 81.744221][ T5231] lock_acquire+0x1ed/0x550 [ 81.748751][ T5231] ? kvfree_call_rcu+0x18a/0x790 [ 81.753817][ T5231] ? __pfx_lock_acquire+0x10/0x10 [ 81.758883][ T5231] ? __phys_addr+0xba/0x170 [ 81.763532][ T5231] _raw_spin_lock+0x2e/0x40 [ 81.768223][ T5231] ? kvfree_call_rcu+0x18a/0x790 [ 81.773166][ T5231] kvfree_call_rcu+0x18a/0x790 [ 81.777942][ T5231] ? _raw_spin_unlock_irqrestore+0xdd/0x140 [ 81.784129][ T5231] ? __pfx_kvfree_call_rcu+0x10/0x10 [ 81.789430][ T5231] ? longest_prefix_match+0x49f/0x650 [ 81.794823][ T5231] trie_delete_elem+0x546/0x6a0 [ 81.799696][ T5231] ? bpf_trace_run2+0x1fc/0x540 [ 81.804579][ T5231] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 81.810317][ T5231] bpf_trace_run2+0x2ec/0x540 [ 81.815104][ T5231] ? __pfx_bpf_trace_run2+0x10/0x10 [ 81.820342][ T5231] ? __pfx_debug_object_activate+0x10/0x10 [ 81.826276][ T5231] ? __pfx_do_raw_spin_lock+0x10/0x10 [ 81.831760][ T5231] enqueue_timer+0x3ce/0x570 [ 81.836409][ T5231] __mod_timer+0xa0e/0xeb0 [ 81.840849][ T5231] ? __pfx___mod_timer+0x10/0x10 [ 81.845797][ T5231] ? __pfx_seqcount_lockdep_reader_access+0x10/0x10 [ 81.852389][ T5231] ? ktime_get+0x3c/0xb0 [ 81.856653][ T5231] ? __asan_memset+0x23/0x50 [ 81.861275][ T5231] sk_reset_timer+0x23/0xc0 [ 81.865897][ T5231] tcp_event_new_data_sent+0x203/0x360 [ 81.871416][ T5231] tcp_write_xmit+0x18dc/0x6a10 [ 81.876288][ T5231] ? __virt_addr_valid+0x183/0x530 [ 81.881409][ T5231] ? __alloc_skb+0x2d5/0x440 [ 81.886018][ T5231] __tcp_push_pending_frames+0x9b/0x360 [ 81.891685][ T5231] tcp_sendmsg_locked+0x43b1/0x4e10 [ 81.897015][ T5231] ? __pfx_tcp_sendmsg_locked+0x10/0x10 [ 81.902673][ T5231] ? __local_bh_enable_ip+0x168/0x200 [ 81.908058][ T5231] ? do_raw_spin_unlock+0x13c/0x8b0 [ 81.913370][ T5231] tcp_sendmsg+0x30/0x50 [ 81.917622][ T5231] __sock_sendmsg+0x1a6/0x270 [ 81.922320][ T5231] sock_write_iter+0x2dd/0x400 [ 81.927113][ T5231] ? __pfx_sock_write_iter+0x10/0x10 [ 81.932436][ T5231] ? bpf_lsm_file_permission+0x9/0x10 [ 81.937842][ T5231] ? security_file_permission+0x7f/0xa0 [ 81.943416][ T5231] vfs_write+0xa72/0xc90 [ 81.947690][ T5231] ? __pfx_sock_write_iter+0x10/0x10 [ 81.953055][ T5231] ? __pfx_vfs_write+0x10/0x10 [ 81.957831][ T5231] ? __set_current_blocked+0x310/0x380 [ 81.963313][ T5231] ? __might_fault+0xc6/0x120 [ 81.968008][ T5231] ksys_write+0x1a0/0x2c0 [ 81.972368][ T5231] ? __pfx_ksys_write+0x10/0x10 [ 81.977346][ T5231] ? do_syscall_64+0x100/0x230 [ 81.982362][ T5231] ? do_syscall_64+0xb6/0x230 [ 81.987071][ T5231] do_syscall_64+0xf3/0x230 [ 81.991626][ T5231] ? clear_bhb_loop+0x35/0x90 [ 81.996319][ T5231] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 82.002302][ T5231] RIP: 0033:0x7fedbe516bf2 [ 82.006737][ T5231] 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 [ 82.026390][ T5231] RSP: 002b:00007ffe72813eb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 82.034906][ T5231] RAX: ffffffffffffffda RBX: 000000000000002c RCX: 00007fedbe516bf2 [ 82.042881][ T5231] RDX: 000000000000002c RSI: 00005597af666960 RDI: 0000000000000004 [ 82.050855][ T5231] RBP: 00005597af674c20 R08: 0000000000000000 R09: 0000000000000000 [ 82.058915][ T5231] R10: 0000000000000000 R11: 0000000000000246 R12: 0000559786cfeaa4 [ 82.066887][ T5231] R13: 0000000000000051 R14: 0000559786cff3e8 R15: 00007ffe72813f28 [ 82.074905][ T5231]