./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor295082136 <...> Warning: Permanently added '10.128.1.133' (ED25519) to the list of known hosts. execve("./syz-executor295082136", ["./syz-executor295082136"], 0x7ffc7a34f640 /* 10 vars */) = 0 brk(NULL) = 0x5555951e7000 brk(0x5555951e7d00) = 0x5555951e7d00 arch_prctl(ARCH_SET_FS, 0x5555951e7380) = 0 set_tid_address(0x5555951e7650) = 5071 set_robust_list(0x5555951e7660, 24) = 0 rseq(0x5555951e7ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor295082136", 4096) = 27 getrandom("\x9f\x5e\x20\x81\x67\xe5\x01\xbc", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x5555951e7d00 brk(0x555595208d00) = 0x555595208d00 brk(0x555595209000) = 0x555595209000 mprotect(0x7f8ccfa00000, 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 5072 attached , child_tidptr=0x5555951e7650) = 5072 [pid 5072] set_robust_list(0x5555951e7660, 24) = 0 [pid 5072] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5072] setpgid(0, 0) = 0 [pid 5072] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5072] write(3, "1000", 4) = 4 [pid 5072] close(3) = 0 [pid 5072] bpf(BPF_MAP_CREATE, {map_type=BPF_MAP_TYPE_LPM_TRIE, key_size=8, value_size=65537, 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 5072] bpf(BPF_PROG_LOAD, {prog_type=BPF_PROG_TYPE_RAW_TRACEPOINT, insn_cnt=12, insns=0x20000740, 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) = 4 [pid 5072] bpf(BPF_RAW_TRACEPOINT_OPEN, {raw_tracepoint={name="timer_start", prog_fd=4}}, 16) = 5 [ 73.841651][ T5066] [ 73.844079][ T5066] ====================================================== [ 73.851094][ T5066] WARNING: possible circular locking dependency detected [ 73.858118][ T5066] 6.8.0-syzkaller-05243-g14bb1e8c8d4a #0 Not tainted [ 73.864793][ T5066] ------------------------------------------------------ [ 73.871807][ T5066] sshd/5066 is trying to acquire lock: [ 73.877260][ T5066] ffff8880b9529470 (krc.lock){....}-{2:2}, at: kvfree_call_rcu+0x18a/0x790 [ 73.885924][ T5066] [ 73.885924][ T5066] but task is already holding lock: [ 73.893310][ T5066] ffff88802ee929f8 (&trie->lock){..-.}-{2:2}, at: trie_delete_elem+0x96/0x6a0 [ 73.902233][ T5066] [ 73.902233][ T5066] which lock already depends on the new lock. [ 73.902233][ T5066] [ 73.912655][ T5066] [ 73.912655][ T5066] the existing dependency chain (in reverse order) is: [ 73.921675][ T5066] [ 73.921675][ T5066] -> #2 (&trie->lock){..-.}-{2:2}: [ 73.928987][ T5066] lock_acquire+0x1e4/0x530 [ 73.934032][ T5066] _raw_spin_lock_irqsave+0xd5/0x120 [ 73.939957][ T5066] trie_delete_elem+0x96/0x6a0 [ 73.945264][ T5066] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 73.951268][ T5066] bpf_trace_run2+0x2ec/0x530 [ 73.956481][ T5066] enqueue_timer+0x396/0x550 [ 73.961597][ T5066] __mod_timer+0xa0e/0xeb0 [ 73.966547][ T5066] schedule_timeout+0x1b9/0x310 [ 73.971930][ T5066] rcu_gp_fqs_loop+0x2df/0x1370 [ 73.977313][ T5066] rcu_gp_kthread+0xa7/0x3b0 [ 73.982442][ T5066] kthread+0x2f0/0x390 [ 73.987042][ T5066] ret_from_fork+0x4b/0x80 [ 73.992094][ T5066] ret_from_fork_asm+0x1a/0x30 [ 73.997391][ T5066] [ 73.997391][ T5066] -> #1 (&base->lock){-.-.}-{2:2}: [ 74.004713][ T5066] lock_acquire+0x1e4/0x530 [ 74.009768][ T5066] _raw_spin_lock_irqsave+0xd5/0x120 [ 74.015580][ T5066] lock_timer_base+0x112/0x240 [ 74.020878][ T5066] __mod_timer+0x1ca/0xeb0 [ 74.025822][ T5066] queue_delayed_work_on+0x15a/0x260 [ 74.031654][ T5066] kvfree_call_rcu+0x47f/0x790 [ 74.036942][ T5066] rtnl_register_internal+0x482/0x590 [ 74.042853][ T5066] rtnl_register+0x36/0x80 [ 74.047792][ T5066] ip_rt_init+0x2f5/0x3a0 [ 74.052664][ T5066] ip_init+0xe/0x20 [ 74.056997][ T5066] inet_init+0x3d8/0x580 [ 74.061767][ T5066] do_one_initcall+0x238/0x830 [ 74.067077][ T5066] do_initcall_level+0x157/0x210 [ 74.072537][ T5066] do_initcalls+0x3f/0x80 [ 74.077388][ T5066] kernel_init_freeable+0x435/0x5d0 [ 74.083107][ T5066] kernel_init+0x1d/0x2a0 [ 74.087966][ T5066] ret_from_fork+0x4b/0x80 [ 74.092910][ T5066] ret_from_fork_asm+0x1a/0x30 [ 74.098204][ T5066] [ 74.098204][ T5066] -> #0 (krc.lock){....}-{2:2}: [ 74.105258][ T5066] validate_chain+0x18cb/0x58e0 [ 74.110638][ T5066] __lock_acquire+0x1346/0x1fd0 [ 74.116009][ T5066] lock_acquire+0x1e4/0x530 [ 74.121035][ T5066] _raw_spin_lock+0x2e/0x40 [ 74.126068][ T5066] kvfree_call_rcu+0x18a/0x790 [ 74.131359][ T5066] trie_delete_elem+0x52c/0x6a0 [ 74.136755][ T5066] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 74.142748][ T5066] bpf_trace_run2+0x2ec/0x530 [ 74.147970][ T5066] enqueue_timer+0x396/0x550 [ 74.153083][ T5066] __mod_timer+0x953/0xeb0 [ 74.158028][ T5066] sk_reset_timer+0x23/0xc0 [ 74.163062][ T5066] tcp_schedule_loss_probe+0x419/0x560 [ 74.169047][ T5066] tcp_write_xmit+0x3682/0x6100 [ 74.174426][ T5066] __tcp_push_pending_frames+0x9b/0x360 [ 74.180502][ T5066] tcp_sendmsg_locked+0x42cc/0x4d00 [ 74.186224][ T5066] tcp_sendmsg+0x30/0x50 [ 74.190994][ T5066] __sock_sendmsg+0x1a6/0x270 [ 74.196191][ T5066] sock_write_iter+0x2dd/0x400 [ 74.201489][ T5066] vfs_write+0xa84/0xcb0 [ 74.206258][ T5066] ksys_write+0x1a0/0x2c0 [ 74.211128][ T5066] do_syscall_64+0xfb/0x240 [ 74.216158][ T5066] entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 74.222580][ T5066] [ 74.222580][ T5066] other info that might help us debug this: [ 74.222580][ T5066] [ 74.232804][ T5066] Chain exists of: [ 74.232804][ T5066] krc.lock --> &base->lock --> &trie->lock [ 74.232804][ T5066] [ 74.244544][ T5066] Possible unsafe locking scenario: [ 74.244544][ T5066] [ 74.251991][ T5066] CPU0 CPU1 [ 74.257391][ T5066] ---- ---- [ 74.262760][ T5066] lock(&trie->lock); [ 74.266852][ T5066] lock(&base->lock); [ 74.273531][ T5066] lock(&trie->lock); [ 74.280154][ T5066] lock(krc.lock); [ 74.283964][ T5066] [ 74.283964][ T5066] *** DEADLOCK *** [ 74.283964][ T5066] [ 74.292122][ T5066] 4 locks held by sshd/5066: [ 74.296710][ T5066] #0: ffff88802c4ea718 (sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_sendmsg+0x22/0x50 [ 74.305860][ T5066] #1: ffff8880b952a758 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x112/0x240 [ 74.315191][ T5066] #2: ffffffff8e131920 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x1fc/0x530 [ 74.324625][ T5066] #3: ffff88802ee929f8 (&trie->lock){..-.}-{2:2}, at: trie_delete_elem+0x96/0x6a0 [ 74.333949][ T5066] [ 74.333949][ T5066] stack backtrace: [ 74.339853][ T5066] CPU: 1 PID: 5066 Comm: sshd Not tainted 6.8.0-syzkaller-05243-g14bb1e8c8d4a #0 [ 74.348963][ T5066] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 [ 74.359019][ T5066] Call Trace: [ 74.362301][ T5066] [ 74.365248][ T5066] dump_stack_lvl+0x1e7/0x2e0 [ 74.369940][ T5066] ? __pfx_dump_stack_lvl+0x10/0x10 [ 74.375173][ T5066] ? print_circular_bug+0x130/0x1a0 [ 74.380404][ T5066] check_noncircular+0x36a/0x4a0 [ 74.385352][ T5066] ? __pfx_check_noncircular+0x10/0x10 [ 74.390863][ T5066] ? lockdep_lock+0x123/0x2b0 [ 74.395552][ T5066] ? __pfx_validate_chain+0x10/0x10 [ 74.400763][ T5066] ? _find_first_zero_bit+0xd4/0x100 [ 74.406082][ T5066] validate_chain+0x18cb/0x58e0 [ 74.410951][ T5066] ? __pfx_validate_chain+0x10/0x10 [ 74.416162][ T5066] ? __pfx_validate_chain+0x10/0x10 [ 74.421366][ T5066] ? mark_lock+0x9a/0x350 [ 74.425724][ T5066] ? __lock_acquire+0x1346/0x1fd0 [ 74.430795][ T5066] ? mark_lock+0x9a/0x350 [ 74.435134][ T5066] ? mark_lock+0x9a/0x350 [ 74.439471][ T5066] __lock_acquire+0x1346/0x1fd0 [ 74.444332][ T5066] lock_acquire+0x1e4/0x530 [ 74.448839][ T5066] ? kvfree_call_rcu+0x18a/0x790 [ 74.453789][ T5066] ? __pfx_lock_acquire+0x10/0x10 [ 74.458815][ T5066] ? debug_object_active_state+0x239/0x360 [ 74.464626][ T5066] ? __pfx_debug_object_active_state+0x10/0x10 [ 74.470786][ T5066] ? __virt_addr_valid+0x183/0x520 [ 74.475929][ T5066] ? __virt_addr_valid+0x183/0x520 [ 74.481059][ T5066] ? __virt_addr_valid+0x44e/0x520 [ 74.486182][ T5066] ? __phys_addr+0xba/0x170 [ 74.490722][ T5066] _raw_spin_lock+0x2e/0x40 [ 74.495234][ T5066] ? kvfree_call_rcu+0x18a/0x790 [ 74.500179][ T5066] kvfree_call_rcu+0x18a/0x790 [ 74.504953][ T5066] ? _raw_spin_lock_irqsave+0xe1/0x120 [ 74.510506][ T5066] ? __pfx_kvfree_call_rcu+0x10/0x10 [ 74.515886][ T5066] ? longest_prefix_match+0x33d/0x670 [ 74.521270][ T5066] trie_delete_elem+0x52c/0x6a0 [ 74.526132][ T5066] ? bpf_trace_run2+0x1fc/0x530 [ 74.531009][ T5066] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 74.536475][ T5066] bpf_trace_run2+0x2ec/0x530 [ 74.541161][ T5066] ? __pfx_bpf_trace_run2+0x10/0x10 [ 74.546372][ T5066] ? __pfx_debug_object_activate+0x10/0x10 [ 74.552192][ T5066] enqueue_timer+0x396/0x550 [ 74.556794][ T5066] __mod_timer+0x953/0xeb0 [ 74.561247][ T5066] ? __pfx___mod_timer+0x10/0x10 [ 74.566240][ T5066] ? __asan_memset+0x23/0x50 [ 74.570842][ T5066] sk_reset_timer+0x23/0xc0 [ 74.575383][ T5066] tcp_schedule_loss_probe+0x419/0x560 [ 74.580875][ T5066] tcp_write_xmit+0x3682/0x6100 [ 74.585762][ T5066] __tcp_push_pending_frames+0x9b/0x360 [ 74.591343][ T5066] tcp_sendmsg_locked+0x42cc/0x4d00 [ 74.596579][ T5066] ? __pfx_tcp_sendmsg_locked+0x10/0x10 [ 74.602136][ T5066] ? __local_bh_enable_ip+0x168/0x200 [ 74.607536][ T5066] ? do_raw_spin_unlock+0x13c/0x8b0 [ 74.612767][ T5066] tcp_sendmsg+0x30/0x50 [ 74.617027][ T5066] __sock_sendmsg+0x1a6/0x270 [ 74.621720][ T5066] sock_write_iter+0x2dd/0x400 [ 74.626504][ T5066] ? __pfx_sock_write_iter+0x10/0x10 [ 74.631809][ T5066] ? bpf_lsm_file_permission+0x9/0x10 [ 74.637196][ T5066] ? security_file_permission+0x7f/0xa0 [ 74.642769][ T5066] vfs_write+0xa84/0xcb0 [ 74.647039][ T5066] ? __pfx_vfs_write+0x10/0x10 [ 74.651810][ T5066] ? __set_current_blocked+0x310/0x380 [ 74.657283][ T5066] ? __might_fault+0xc6/0x120 [ 74.661971][ T5066] ? __fdget_pos+0x1a2/0x320 [ 74.666600][ T5066] ksys_write+0x1a0/0x2c0 [ 74.670942][ T5066] ? __pfx_ksys_write+0x10/0x10 [ 74.675801][ T5066] ? do_syscall_64+0x10a/0x240 [ 74.680606][ T5066] ? do_syscall_64+0xb6/0x240 [ 74.685297][ T5066] do_syscall_64+0xfb/0x240 [ 74.689815][ T5066] entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 74.695758][ T5066] RIP: 0033:0x7f7051116bf2 [ 74.700191][ T5066] 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 [ 74.719824][ T5066] RSP: 002b:00007ffd2a6ca868 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 74.728262][ T5066] RAX: ffffffffffffffda RBX: 000000000000008c RCX: 00007f7051116bf2 [ 74.736240][ T5066] RDX: 000000000000008c RSI: 000055d9b81ae960 RDI: 0000000000000004 [ 74.744240][ T5066] RBP: 000055d9b81bc220 R08: 0000000000000000 R09: 0000000000000000 [ 74.752234][ T5066] R10: 0000000000000000 R11: 0000000000000246 R12: 000055d988436aa4 [ 74.760222][ T5066] R13: 0000000000000049 R14: 000055d9884373e8 R15: 00007ffd2a6ca8d8 [ 74.768216][ T5066]