============================= WARNING: suspicious RCU usage 5.15.189-syzkaller #0 Not tainted ----------------------------- include/linux/rhashtable.h:594 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 1 lock held by syz.3.330/5043: #0: ffff80001629c1e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:72 stack backtrace: CPU: 1 PID: 5043 Comm: syz.3.330 Not tainted 5.15.189-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call trace: dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 lockdep_rcu_suspicious+0x140/0x198 kernel/locking/lockdep.c:6574 __rhashtable_lookup include/linux/rhashtable.h:594 [inline] rhltable_lookup+0x658/0x660 include/linux/rhashtable.h:688 mr_mfc_find_any_parent+0x94/0x1a0 net/ipv4/ipmr_base.c:83 ip_mr_forward+0x214/0xd5c net/ipv4/ipmr.c:1949 ipmr_cache_resolve net/ipv4/ipmr.c:1003 [inline] ipmr_mfc_add+0x1e6c/0x2824 net/ipv4/ipmr.c:1262 ip_mroute_setsockopt+0xa4c/0xcb8 net/ipv4/ipmr.c:1459 do_ip_setsockopt net/ipv4/ip_sockglue.c:947 [inline] ip_setsockopt+0x5c4/0x2978 net/ipv4/ip_sockglue.c:1430 raw_setsockopt+0xdc/0x2ac net/ipv4/raw.c:863 sock_common_setsockopt+0xb0/0xcc net/core/sock.c:3446 __sys_setsockopt+0x260/0x36c net/socket.c:2203 __do_sys_setsockopt net/socket.c:2214 [inline] __se_sys_setsockopt net/socket.c:2211 [inline] __arm64_sys_setsockopt+0xb8/0xd4 net/socket.c:2211 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 ============================= WARNING: suspicious RCU usage 5.15.189-syzkaller #0 Not tainted ----------------------------- include/linux/rhashtable.h:369 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 1 lock held by syz.3.330/5043: #0: ffff80001629c1e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:72 stack backtrace: CPU: 1 PID: 5043 Comm: syz.3.330 Not tainted 5.15.189-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call trace: dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 lockdep_rcu_suspicious+0x140/0x198 kernel/locking/lockdep.c:6574 rht_ptr_rcu include/linux/rhashtable.h:369 [inline] __rhashtable_lookup include/linux/rhashtable.h:599 [inline] rhltable_lookup+0x404/0x660 include/linux/rhashtable.h:688 mr_mfc_find_any_parent+0x94/0x1a0 net/ipv4/ipmr_base.c:83 ip_mr_forward+0x214/0xd5c net/ipv4/ipmr.c:1949 ipmr_cache_resolve net/ipv4/ipmr.c:1003 [inline] ipmr_mfc_add+0x1e6c/0x2824 net/ipv4/ipmr.c:1262 ip_mroute_setsockopt+0xa4c/0xcb8 net/ipv4/ipmr.c:1459 do_ip_setsockopt net/ipv4/ip_sockglue.c:947 [inline] ip_setsockopt+0x5c4/0x2978 net/ipv4/ip_sockglue.c:1430 raw_setsockopt+0xdc/0x2ac net/ipv4/raw.c:863 sock_common_setsockopt+0xb0/0xcc net/core/sock.c:3446 __sys_setsockopt+0x260/0x36c net/socket.c:2203 __do_sys_setsockopt net/socket.c:2214 [inline] __se_sys_setsockopt net/socket.c:2211 [inline] __arm64_sys_setsockopt+0xb8/0xd4 net/socket.c:2211 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 ============================= WARNING: suspicious RCU usage 5.15.189-syzkaller #0 Not tainted ----------------------------- include/linux/rhashtable.h:614 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 1 lock held by syz.3.330/5043: #0: ffff80001629c1e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:72 stack backtrace: CPU: 1 PID: 5043 Comm: syz.3.330 Not tainted 5.15.189-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call trace: dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 lockdep_rcu_suspicious+0x140/0x198 kernel/locking/lockdep.c:6574 __rhashtable_lookup include/linux/rhashtable.h:614 [inline] rhltable_lookup+0x500/0x660 include/linux/rhashtable.h:688 mr_mfc_find_any_parent+0x94/0x1a0 net/ipv4/ipmr_base.c:83 ip_mr_forward+0x214/0xd5c net/ipv4/ipmr.c:1949 ipmr_cache_resolve net/ipv4/ipmr.c:1003 [inline] ipmr_mfc_add+0x1e6c/0x2824 net/ipv4/ipmr.c:1262 ip_mroute_setsockopt+0xa4c/0xcb8 net/ipv4/ipmr.c:1459 do_ip_setsockopt net/ipv4/ip_sockglue.c:947 [inline] ip_setsockopt+0x5c4/0x2978 net/ipv4/ip_sockglue.c:1430 raw_setsockopt+0xdc/0x2ac net/ipv4/raw.c:863 sock_common_setsockopt+0xb0/0xcc net/core/sock.c:3446 __sys_setsockopt+0x260/0x36c net/socket.c:2203 __do_sys_setsockopt net/socket.c:2214 [inline] __se_sys_setsockopt net/socket.c:2211 [inline] __arm64_sys_setsockopt+0xb8/0xd4 net/socket.c:2211 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584