./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor2811170474 <...> Warning: Permanently added '10.128.0.253' (ED25519) to the list of known hosts. execve("./syz-executor2811170474", ["./syz-executor2811170474"], 0x7ffe165a38f0 /* 10 vars */) = 0 brk(NULL) = 0x555565f0d000 brk(0x555565f0dd00) = 0x555565f0dd00 arch_prctl(ARCH_SET_FS, 0x555565f0d380) = 0 set_tid_address(0x555565f0d650) = 5066 set_robust_list(0x555565f0d660, 24) = 0 rseq(0x555565f0dca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor2811170474", 4096) = 28 getrandom("\xca\xe2\x5a\x0c\xb8\x5a\xdd\x17", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555565f0dd00 brk(0x555565f2ed00) = 0x555565f2ed00 brk(0x555565f2f000) = 0x555565f2f000 mprotect(0x7f1ff2aa5000, 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, child_tidptr=0x555565f0d650) = 5067 ./strace-static-x86_64: Process 5067 attached [pid 5067] set_robust_list(0x555565f0d660, 24) = 0 [pid 5067] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5067] setpgid(0, 0) = 0 [pid 5067] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5067] write(3, "1000", 4) = 4 [pid 5067] close(3) = 0 [pid 5067] 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 5067] 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 5067] bpf(BPF_RAW_TRACEPOINT_OPEN, {raw_tracepoint={name="timer_start", prog_fd=4}}, 16) = 5 [ 72.252007][ T5061] [ 72.254369][ T5061] ====================================================== [ 72.261387][ T5061] WARNING: possible circular locking dependency detected [ 72.268397][ T5061] 6.8.0-syzkaller-05236-g443574b03387 #0 Not tainted [ 72.275065][ T5061] ------------------------------------------------------ [ 72.282076][ T5061] sshd/5061 is trying to acquire lock: [ 72.287614][ T5061] ffff8880b9529470 (krc.lock){....}-{2:2}, at: kvfree_call_rcu+0x18a/0x790 [ 72.296257][ T5061] [ 72.296257][ T5061] but task is already holding lock: [ 72.303617][ T5061] ffff88802a6111f8 (&trie->lock){....}-{2:2}, at: trie_delete_elem+0x96/0x6a0 [ 72.312499][ T5061] [ 72.312499][ T5061] which lock already depends on the new lock. [ 72.312499][ T5061] [ 72.322918][ T5061] [ 72.322918][ T5061] the existing dependency chain (in reverse order) is: [ 72.331923][ T5061] [ 72.331923][ T5061] -> #2 (&trie->lock){....}-{2:2}: [ 72.339218][ T5061] lock_acquire+0x1e4/0x530 [ 72.344238][ T5061] _raw_spin_lock_irqsave+0xd5/0x120 [ 72.350051][ T5061] trie_delete_elem+0x96/0x6a0 [ 72.355340][ T5061] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 72.361318][ T5061] bpf_trace_run2+0x204/0x420 [ 72.366515][ T5061] enqueue_timer+0x396/0x550 [ 72.371621][ T5061] __mod_timer+0x953/0xeb0 [ 72.376559][ T5061] sk_reset_timer+0x23/0xc0 [ 72.381599][ T5061] tcp_event_new_data_sent+0x203/0x360 [ 72.387600][ T5061] tcp_write_xmit+0x1468/0x6100 [ 72.392978][ T5061] __tcp_push_pending_frames+0x9b/0x360 [ 72.399047][ T5061] tcp_sendmsg_locked+0x42cc/0x4d00 [ 72.404853][ T5061] tcp_sendmsg+0x30/0x50 [ 72.409613][ T5061] __sock_sendmsg+0x1a6/0x270 [ 72.414814][ T5061] sock_write_iter+0x2dd/0x400 [ 72.420130][ T5061] vfs_write+0xa84/0xcb0 [ 72.424896][ T5061] ksys_write+0x1a0/0x2c0 [ 72.429761][ T5061] do_syscall_64+0xfb/0x240 [ 72.434931][ T5061] entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 72.441385][ T5061] [ 72.441385][ T5061] -> #1 (&base->lock){-.-.}-{2:2}: [ 72.448709][ T5061] lock_acquire+0x1e4/0x530 [ 72.453754][ T5061] _raw_spin_lock_irqsave+0xd5/0x120 [ 72.459566][ T5061] lock_timer_base+0x112/0x240 [ 72.464863][ T5061] __mod_timer+0x1ca/0xeb0 [ 72.469819][ T5061] queue_delayed_work_on+0x15a/0x260 [ 72.475658][ T5061] kvfree_call_rcu+0x47f/0x790 [ 72.480946][ T5061] rtnl_register_internal+0x482/0x590 [ 72.486844][ T5061] rtnl_register+0x36/0x80 [ 72.491781][ T5061] ip_rt_init+0x2f5/0x3a0 [ 72.496637][ T5061] ip_init+0xe/0x20 [ 72.500967][ T5061] inet_init+0x3d8/0x580 [ 72.505755][ T5061] do_one_initcall+0x238/0x830 [ 72.511048][ T5061] do_initcall_level+0x157/0x210 [ 72.516511][ T5061] do_initcalls+0x3f/0x80 [ 72.521356][ T5061] kernel_init_freeable+0x435/0x5d0 [ 72.527083][ T5061] kernel_init+0x1d/0x2a0 [ 72.531940][ T5061] ret_from_fork+0x4b/0x80 [ 72.536879][ T5061] ret_from_fork_asm+0x1a/0x30 [ 72.542167][ T5061] [ 72.542167][ T5061] -> #0 (krc.lock){....}-{2:2}: [ 72.549208][ T5061] validate_chain+0x18cb/0x58e0 [ 72.554580][ T5061] __lock_acquire+0x1346/0x1fd0 [ 72.559944][ T5061] lock_acquire+0x1e4/0x530 [ 72.564973][ T5061] _raw_spin_lock+0x2e/0x40 [ 72.570000][ T5061] kvfree_call_rcu+0x18a/0x790 [ 72.575309][ T5061] trie_delete_elem+0x52c/0x6a0 [ 72.580685][ T5061] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 72.586667][ T5061] bpf_trace_run2+0x204/0x420 [ 72.591865][ T5061] enqueue_timer+0x396/0x550 [ 72.596997][ T5061] __mod_timer+0x953/0xeb0 [ 72.601942][ T5061] sk_reset_timer+0x23/0xc0 [ 72.606965][ T5061] tcp_schedule_loss_probe+0x419/0x560 [ 72.612947][ T5061] tcp_write_xmit+0x3682/0x6100 [ 72.618321][ T5061] __tcp_push_pending_frames+0x9b/0x360 [ 72.624389][ T5061] tcp_sendmsg_locked+0x42cc/0x4d00 [ 72.630108][ T5061] tcp_sendmsg+0x30/0x50 [ 72.634870][ T5061] __sock_sendmsg+0x1a6/0x270 [ 72.640089][ T5061] sock_write_iter+0x2dd/0x400 [ 72.645379][ T5061] vfs_write+0xa84/0xcb0 [ 72.650142][ T5061] ksys_write+0x1a0/0x2c0 [ 72.654992][ T5061] do_syscall_64+0xfb/0x240 [ 72.660037][ T5061] entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 72.666466][ T5061] [ 72.666466][ T5061] other info that might help us debug this: [ 72.666466][ T5061] [ 72.676691][ T5061] Chain exists of: [ 72.676691][ T5061] krc.lock --> &base->lock --> &trie->lock [ 72.676691][ T5061] [ 72.688426][ T5061] Possible unsafe locking scenario: [ 72.688426][ T5061] [ 72.695864][ T5061] CPU0 CPU1 [ 72.701230][ T5061] ---- ---- [ 72.706595][ T5061] lock(&trie->lock); [ 72.710668][ T5061] lock(&base->lock); [ 72.717257][ T5061] lock(&trie->lock); [ 72.723849][ T5061] lock(krc.lock); [ 72.727658][ T5061] [ 72.727658][ T5061] *** DEADLOCK *** [ 72.727658][ T5061] [ 72.735796][ T5061] 4 locks held by sshd/5061: [ 72.740377][ T5061] #0: ffff88801f1ab358 (sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_sendmsg+0x22/0x50 [ 72.749523][ T5061] #1: ffff8880b952a758 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x112/0x240 [ 72.758851][ T5061] #2: ffffffff8e131920 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x114/0x420 [ 72.768263][ T5061] #3: ffff88802a6111f8 (&trie->lock){....}-{2:2}, at: trie_delete_elem+0x96/0x6a0 [ 72.777585][ T5061] [ 72.777585][ T5061] stack backtrace: [ 72.783459][ T5061] CPU: 1 PID: 5061 Comm: sshd Not tainted 6.8.0-syzkaller-05236-g443574b03387 #0 [ 72.792559][ T5061] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 [ 72.802609][ T5061] Call Trace: [ 72.805890][ T5061] [ 72.808821][ T5061] dump_stack_lvl+0x1e7/0x2e0 [ 72.813509][ T5061] ? __pfx_dump_stack_lvl+0x10/0x10 [ 72.818713][ T5061] ? print_circular_bug+0x130/0x1a0 [ 72.823922][ T5061] check_noncircular+0x36a/0x4a0 [ 72.828869][ T5061] ? __pfx_check_noncircular+0x10/0x10 [ 72.834336][ T5061] ? lockdep_lock+0x123/0x2b0 [ 72.839022][ T5061] ? __virt_addr_valid+0x183/0x520 [ 72.844141][ T5061] ? __pfx_validate_chain+0x10/0x10 [ 72.849341][ T5061] ? _find_first_zero_bit+0xd4/0x100 [ 72.854640][ T5061] validate_chain+0x18cb/0x58e0 [ 72.859499][ T5061] ? __pfx_validate_chain+0x10/0x10 [ 72.864697][ T5061] ? __pfx_validate_chain+0x10/0x10 [ 72.869891][ T5061] ? mark_lock+0x9a/0x350 [ 72.874240][ T5061] ? __lock_acquire+0x1346/0x1fd0 [ 72.879268][ T5061] ? mark_lock+0x9a/0x350 [ 72.883617][ T5061] ? mark_lock+0x9a/0x350 [ 72.887947][ T5061] __lock_acquire+0x1346/0x1fd0 [ 72.892803][ T5061] lock_acquire+0x1e4/0x530 [ 72.897306][ T5061] ? kvfree_call_rcu+0x18a/0x790 [ 72.902248][ T5061] ? __pfx_lock_acquire+0x10/0x10 [ 72.907273][ T5061] ? debug_object_active_state+0x239/0x360 [ 72.913079][ T5061] ? __pfx_debug_object_active_state+0x10/0x10 [ 72.919235][ T5061] ? __virt_addr_valid+0x183/0x520 [ 72.924360][ T5061] ? __virt_addr_valid+0x183/0x520 [ 72.929496][ T5061] ? __virt_addr_valid+0x44e/0x520 [ 72.934619][ T5061] ? __phys_addr+0xba/0x170 [ 72.939155][ T5061] _raw_spin_lock+0x2e/0x40 [ 72.944099][ T5061] ? kvfree_call_rcu+0x18a/0x790 [ 72.949048][ T5061] kvfree_call_rcu+0x18a/0x790 [ 72.953819][ T5061] ? _raw_spin_lock_irqsave+0xe1/0x120 [ 72.959279][ T5061] ? __pfx_kvfree_call_rcu+0x10/0x10 [ 72.964563][ T5061] ? longest_prefix_match+0x33d/0x670 [ 72.969938][ T5061] trie_delete_elem+0x52c/0x6a0 [ 72.974816][ T5061] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 72.980274][ T5061] bpf_trace_run2+0x204/0x420 [ 72.984956][ T5061] ? bpf_trace_run2+0x114/0x420 [ 72.989803][ T5061] ? __pfx_bpf_trace_run2+0x10/0x10 [ 72.995003][ T5061] ? __pfx_debug_object_activate+0x10/0x10 [ 73.000821][ T5061] enqueue_timer+0x396/0x550 [ 73.005438][ T5061] __mod_timer+0x953/0xeb0 [ 73.009870][ T5061] ? __pfx___mod_timer+0x10/0x10 [ 73.014816][ T5061] ? __asan_memset+0x23/0x50 [ 73.019409][ T5061] sk_reset_timer+0x23/0xc0 [ 73.023908][ T5061] tcp_schedule_loss_probe+0x419/0x560 [ 73.029371][ T5061] tcp_write_xmit+0x3682/0x6100 [ 73.034243][ T5061] __tcp_push_pending_frames+0x9b/0x360 [ 73.039796][ T5061] tcp_sendmsg_locked+0x42cc/0x4d00 [ 73.045013][ T5061] ? __pfx_tcp_sendmsg_locked+0x10/0x10 [ 73.050561][ T5061] ? __local_bh_enable_ip+0x168/0x200 [ 73.055949][ T5061] ? do_raw_spin_unlock+0x13c/0x8b0 [ 73.061172][ T5061] tcp_sendmsg+0x30/0x50 [ 73.065411][ T5061] __sock_sendmsg+0x1a6/0x270 [ 73.070086][ T5061] sock_write_iter+0x2dd/0x400 [ 73.074877][ T5061] ? __pfx_sock_write_iter+0x10/0x10 [ 73.080192][ T5061] ? bpf_lsm_file_permission+0x9/0x10 [ 73.085571][ T5061] ? security_file_permission+0x7f/0xa0 [ 73.091120][ T5061] vfs_write+0xa84/0xcb0 [ 73.095386][ T5061] ? __pfx_vfs_write+0x10/0x10 [ 73.100171][ T5061] ? __set_current_blocked+0x310/0x380 [ 73.105641][ T5061] ? __might_fault+0xc6/0x120 [ 73.110322][ T5061] ? __fdget_pos+0x1a2/0x320 [ 73.114921][ T5061] ksys_write+0x1a0/0x2c0 [ 73.119255][ T5061] ? __pfx_ksys_write+0x10/0x10 [ 73.124106][ T5061] ? do_syscall_64+0x10a/0x240 [ 73.128875][ T5061] ? do_syscall_64+0xb6/0x240 [ 73.133561][ T5061] do_syscall_64+0xfb/0x240 [ 73.138066][ T5061] entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 73.143980][ T5061] RIP: 0033:0x7fe05cd16bf2 [ 73.148391][ T5061] 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 [ 73.167995][ T5061] RSP: 002b:00007ffdced044e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 73.176413][ T5061] RAX: ffffffffffffffda RBX: 000000000000008c RCX: 00007fe05cd16bf2 [ 73.184380][ T5061] RDX: 000000000000008c RSI: 000055feaf7d5960 RDI: 0000000000000004 [ 73.192352][ T5061] RBP: 000055feaf7de3f0 R08: 0000000000000000 R09: 0000000000000000 [ 73.200331][ T5061] R10: 0000000000000000 R11: 0000000000000246 R12: 000055fe7aa98aa4 [ 73.208304][ T5061] R13: 0000000000000048 R14: 000055fe7aa993e8 R15: 00007ffdced04558 [ 73.216279][ T5061]