./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor3355527575 <...> Warning: Permanently added '10.128.0.123' (ED25519) to the list of known hosts. execve("./syz-executor3355527575", ["./syz-executor3355527575"], 0x7ffe53dc6490 /* 10 vars */) = 0 brk(NULL) = 0x555570f3f000 brk(0x555570f3fd00) = 0x555570f3fd00 arch_prctl(ARCH_SET_FS, 0x555570f3f380) = 0 set_tid_address(0x555570f3f650) = 5095 set_robust_list(0x555570f3f660, 24) = 0 rseq(0x555570f3fca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor3355527575", 4096) = 28 getrandom("\xe2\xf7\xd7\xfb\xc1\x58\xb4\x05", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555570f3fd00 brk(0x555570f60d00) = 0x555570f60d00 brk(0x555570f61000) = 0x555570f61000 mprotect(0x7f5cc2c7a000, 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=0x555570f3f650) = 5096 ./strace-static-x86_64: Process 5096 attached [pid 5096] set_robust_list(0x555570f3f660, 24) = 0 [pid 5096] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5096] setpgid(0, 0) = 0 [pid 5096] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5096] write(3, "1000", 4) = 4 [pid 5096] close(3) = 0 [pid 5096] write(1, "executing program\n", 18executing program ) = 18 [pid 5096] 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 5096] socketpair(AF_TIPC, SOCK_DGRAM, 0, [3, 4]) = 0 [pid 5096] close(3) = 0 [pid 5096] 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 5096] 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 5096] close(3) = 0 [pid 5096] 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 5096] bpf(BPF_MAP_UPDATE_ELEM, {map_fd=3, key=0x20000340, value=0x20000200, flags=BPF_ANY}, 32) = 0 [pid 5096] 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 5096] bpf(BPF_RAW_TRACEPOINT_OPEN, {raw_tracepoint={name="timer_start", prog_fd=5}}, 16) = 6 [ 70.953781][ T5090] [ 70.953794][ T5090] ====================================================== [ 70.953799][ T5090] WARNING: possible circular locking dependency detected [ 70.953814][ T5090] 6.10.0-rc2-next-20240606-syzkaller #0 Tainted: G W [ 70.953824][ T5090] ------------------------------------------------------ [ 70.953829][ T5090] sshd/5090 is trying to acquire lock: [ 70.953837][ T5090] ffff8880b9429430 (krc.lock){....}-{2:2}, at: kvfree_call_rcu+0x18a/0x790 [ 70.953899][ T5090] [ 70.953899][ T5090] but task is already holding lock: [ 70.953904][ T5090] ffff8880b942a718 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x112/0x240 [ 70.953938][ T5090] [ 70.953938][ T5090] which lock already depends on the new lock. [ 70.953938][ T5090] [ 70.953943][ T5090] [ 70.953943][ T5090] the existing dependency chain (in reverse order) is: [ 70.953948][ T5090] [ 70.953948][ T5090] -> #1 (&base->lock){-.-.}-{2:2}: [ 70.953967][ T5090] lock_acquire+0x1ed/0x550 [ 70.953983][ T5090] _raw_spin_lock_irqsave+0xd5/0x120 [ 70.954002][ T5090] lock_timer_base+0x112/0x240 [ 70.954018][ T5090] __mod_timer+0x1ca/0xeb0 [ 70.954033][ T5090] queue_delayed_work_on+0x1ca/0x390 [ 70.954049][ T5090] kvfree_call_rcu+0x47f/0x790 [ 70.954067][ T5090] rtnl_register_internal+0x482/0x590 [ 70.954082][ T5090] rtnl_register+0x36/0x80 [ 70.954094][ T5090] ip_rt_init+0x2f6/0x3a0 [ 70.954108][ T5090] ip_init+0xe/0x20 [ 70.954119][ T5090] inet_init+0x3d8/0x580 [ 70.954134][ T5090] do_one_initcall+0x248/0x880 [ 70.954153][ T5090] do_initcall_level+0x157/0x210 [ 70.954172][ T5090] do_initcalls+0x3f/0x80 [ 70.954187][ T5090] kernel_init_freeable+0x435/0x5d0 [ 70.954203][ T5090] kernel_init+0x1d/0x2b0 [ 70.954217][ T5090] ret_from_fork+0x4b/0x80 [ 70.954237][ T5090] ret_from_fork_asm+0x1a/0x30 [ 70.954257][ T5090] [ 70.954257][ T5090] -> #0 (krc.lock){....}-{2:2}: [ 70.954276][ T5090] validate_chain+0x18ef/0x5920 [ 70.954295][ T5090] __lock_acquire+0x1359/0x2000 [ 70.954310][ T5090] lock_acquire+0x1ed/0x550 [ 70.954330][ T5090] _raw_spin_lock+0x2e/0x40 [ 70.954344][ T5090] kvfree_call_rcu+0x18a/0x790 [ 70.954362][ T5090] trie_delete_elem+0x546/0x6a0 [ 70.954381][ T5090] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 70.954396][ T5090] bpf_trace_run2+0x2ec/0x540 [ 70.954410][ T5090] enqueue_timer+0x3ce/0x570 [ 70.954429][ T5090] __mod_timer+0x953/0xeb0 [ 70.954443][ T5090] sk_reset_timer+0x23/0xc0 [ 70.954463][ T5090] tcp_event_new_data_sent+0x203/0x360 [ 70.954485][ T5090] tcp_write_xmit+0x18dc/0x6a10 [ 70.954504][ T5090] __tcp_push_pending_frames+0x9b/0x360 [ 70.954524][ T5090] tcp_sendmsg_locked+0x43b1/0x4e10 [ 70.954539][ T5090] tcp_sendmsg+0x30/0x50 [ 70.954553][ T5090] __sock_sendmsg+0x1a6/0x270 [ 70.954574][ T5090] sock_write_iter+0x2dd/0x400 [ 70.954592][ T5090] vfs_write+0xa72/0xc90 [ 70.954613][ T5090] ksys_write+0x1a0/0x2c0 [ 70.954633][ T5090] do_syscall_64+0xf3/0x230 [ 70.954654][ T5090] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 70.954669][ T5090] [ 70.954669][ T5090] other info that might help us debug this: [ 70.954669][ T5090] [ 70.954674][ T5090] Possible unsafe locking scenario: [ 70.954674][ T5090] [ 70.954678][ T5090] CPU0 CPU1 [ 70.954683][ T5090] ---- ---- [ 70.954687][ T5090] lock(&base->lock); [ 70.954697][ T5090] lock(krc.lock); [ 70.954707][ T5090] lock(&base->lock); [ 70.954717][ T5090] lock(krc.lock); [ 70.954726][ T5090] [ 70.954726][ T5090] *** DEADLOCK *** [ 70.954726][ T5090] [ 70.954729][ T5090] 3 locks held by sshd/5090: [ 70.954737][ T5090] #0: ffff88802d653358 (sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_sendmsg+0x22/0x50 [ 70.954773][ T5090] #1: ffff8880b942a718 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x112/0x240 [ 70.954809][ T5090] #2: ffffffff8e334520 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x1fc/0x540 [ 70.954843][ T5090] [ 70.954843][ T5090] stack backtrace: [ 70.954853][ T5090] CPU: 0 PID: 5090 Comm: sshd Tainted: G W 6.10.0-rc2-next-20240606-syzkaller #0 [ 70.954871][ T5090] Tainted: [W]=WARN [ 70.954876][ T5090] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 [ 70.954887][ T5090] Call Trace: [ 70.954894][ T5090] [ 70.954905][ T5090] dump_stack_lvl+0x241/0x360 [ 70.954932][ T5090] ? __pfx_dump_stack_lvl+0x10/0x10 [ 70.954956][ T5090] ? __pfx__printk+0x10/0x10 [ 70.954982][ T5090] print_circular_bug+0x13a/0x1b0 [ 70.955005][ T5090] check_noncircular+0x36a/0x4a0 [ 70.955028][ T5090] ? __pfx_check_noncircular+0x10/0x10 [ 70.955049][ T5090] ? lockdep_lock+0x123/0x2b0 [ 70.955066][ T5090] ? mark_lock+0x9a/0x360 [ 70.955087][ T5090] validate_chain+0x18ef/0x5920 [ 70.955117][ T5090] ? __pfx_validate_chain+0x10/0x10 [ 70.955137][ T5090] ? stack_depot_save_flags+0x6e4/0x830 [ 70.955155][ T5090] ? do_raw_spin_lock+0x14f/0x370 [ 70.955178][ T5090] ? __pfx_lock_release+0x10/0x10 [ 70.955197][ T5090] ? do_raw_spin_unlock+0x13c/0x8b0 [ 70.955223][ T5090] ? _raw_spin_unlock_irqrestore+0xdd/0x140 [ 70.955240][ T5090] ? __pfx__raw_spin_unlock_irqrestore+0x10/0x10 [ 70.955257][ T5090] ? stack_trace_save+0x118/0x1d0 [ 70.955278][ T5090] ? mark_lock+0x9a/0x360 [ 70.955297][ T5090] __lock_acquire+0x1359/0x2000 [ 70.955321][ T5090] lock_acquire+0x1ed/0x550 [ 70.955341][ T5090] ? kvfree_call_rcu+0x18a/0x790 [ 70.955365][ T5090] ? __pfx_lock_acquire+0x10/0x10 [ 70.955389][ T5090] ? __phys_addr+0xba/0x170 [ 70.955411][ T5090] _raw_spin_lock+0x2e/0x40 [ 70.955426][ T5090] ? kvfree_call_rcu+0x18a/0x790 [ 70.955445][ T5090] kvfree_call_rcu+0x18a/0x790 [ 70.955467][ T5090] ? _raw_spin_unlock_irqrestore+0xdd/0x140 [ 70.955484][ T5090] ? __pfx_kvfree_call_rcu+0x10/0x10 [ 70.955506][ T5090] ? longest_prefix_match+0x49f/0x650 [ 70.955529][ T5090] trie_delete_elem+0x546/0x6a0 [ 70.955553][ T5090] ? bpf_trace_run2+0x1fc/0x540 [ 70.955567][ T5090] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 70.955580][ T5090] bpf_trace_run2+0x2ec/0x540 [ 70.955597][ T5090] ? __pfx_bpf_trace_run2+0x10/0x10 [ 70.955614][ T5090] ? __pfx_debug_object_activate+0x10/0x10 [ 70.955628][ T5090] ? __tcp_transmit_skb+0x21e8/0x3b30 [ 70.955655][ T5090] enqueue_timer+0x3ce/0x570 [ 70.955678][ T5090] __mod_timer+0x953/0xeb0 [ 70.955699][ T5090] ? __pfx___mod_timer+0x10/0x10 [ 70.955716][ T5090] ? __pfx_seqcount_lockdep_reader_access+0x10/0x10 [ 70.955734][ T5090] ? ktime_get+0x3c/0xb0 [ 70.955752][ T5090] ? __asan_memset+0x23/0x50 [ 70.955773][ T5090] sk_reset_timer+0x23/0xc0 [ 70.955795][ T5090] tcp_event_new_data_sent+0x203/0x360 [ 70.955820][ T5090] tcp_write_xmit+0x18dc/0x6a10 [ 70.955850][ T5090] ? __virt_addr_valid+0x183/0x520 [ 70.955873][ T5090] ? __alloc_skb+0x2d5/0x440 [ 70.955895][ T5090] __tcp_push_pending_frames+0x9b/0x360 [ 70.955918][ T5090] tcp_sendmsg_locked+0x43b1/0x4e10 [ 70.955956][ T5090] ? __pfx_tcp_sendmsg_locked+0x10/0x10 [ 70.955972][ T5090] ? __local_bh_enable_ip+0x168/0x200 [ 70.955989][ T5090] ? do_raw_spin_unlock+0x13c/0x8b0 [ 70.956016][ T5090] tcp_sendmsg+0x30/0x50 [ 70.956033][ T5090] __sock_sendmsg+0x1a6/0x270 [ 70.956056][ T5090] sock_write_iter+0x2dd/0x400 [ 70.956077][ T5090] ? __pfx_sock_write_iter+0x10/0x10 [ 70.956102][ T5090] ? bpf_lsm_file_permission+0x9/0x10 [ 70.956122][ T5090] ? security_file_permission+0x7f/0xa0 [ 70.956149][ T5090] vfs_write+0xa72/0xc90 [ 70.956172][ T5090] ? __pfx_sock_write_iter+0x10/0x10 [ 70.956193][ T5090] ? __pfx_vfs_write+0x10/0x10 [ 70.956214][ T5090] ? __set_current_blocked+0x310/0x380 [ 70.956233][ T5090] ? __might_fault+0xc6/0x120 [ 70.956255][ T5090] ksys_write+0x1a0/0x2c0 [ 70.956279][ T5090] ? __pfx_ksys_write+0x10/0x10 [ 70.956302][ T5090] ? do_syscall_64+0x100/0x230 [ 70.956330][ T5090] ? do_syscall_64+0xb6/0x230 [ 70.956354][ T5090] do_syscall_64+0xf3/0x230 [ 70.956376][ T5090] ? clear_bhb_loop+0x35/0x90 [ 70.956394][ T5090] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 70.956409][ T5090] RIP: 0033:0x7fc1e8b16bf2 [ 70.956421][ T5090] 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 [ 70.956433][ T5090] RSP: 002b:00007ffe5bd48cd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 70.956448][ T5090] RAX: ffffffffffffffda RBX: 000000000000002c RCX: 00007fc1e8b16bf2 [ 70.956458][ T5090] RDX: 000000000000002c RSI: 0000563611ace960 RDI: 0000000000000004 [ 70.956468][ T5090] RBP: 0000563611ad73f0 R08: 0000000000000000 R09: 0000000000000000 [ 70.956477][ T5090] R10: 0000000000000000 R11: 0000000000000246 R12: 00005635e7499aa4 [ 70.956486][ T5090] R13: 0000000000000046 R14: 00005635e749a3e8 R15: 00007ffe5bd48d48 [ 70.956504][ T5090]