rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P3638/1:b..l
	(detected by 0, t=10502 jiffies, g=14845, q=196 ncpus=2)
task:udevd           state:R  running task     stack:22512 pid:3638  ppid:1      flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:6731
 preempt_schedule+0xbc/0xd0 kernel/sched/core.c:6755
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock_irqrestore+0x10d/0x120 kernel/locking/spinlock.c:194
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 __wake_up_common_lock kernel/sched/wait.c:140 [inline]
 __wake_up_sync_key+0x128/0x190 kernel/sched/wait.c:208
 sock_def_readable+0x15b/0x280 net/core/sock.c:3316
 __netlink_sendskb net/netlink/af_netlink.c:1264 [inline]
 netlink_sendskb+0x97/0x130 net/netlink/af_netlink.c:1270
 netlink_sendmsg+0x8ad/0xbd0 net/netlink/af_netlink.c:1872
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x5be/0x970 net/socket.c:2518
 ___sys_sendmsg+0x2a2/0x360 net/socket.c:2572
 __sys_sendmsg net/socket.c:2601 [inline]
 __do_sys_sendmsg net/socket.c:2610 [inline]
 __se_sys_sendmsg+0x1bb/0x2a0 net/socket.c:2608
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7efd936a7407
RSP: 002b:00007ffcea46a180 EFLAGS: 00000202 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007efd93df0880 RCX: 00007efd936a7407
RDX: 0000000000000000 RSI: 00007ffcea46a1e0 RDI: 0000000000000004
RBP: 000056198e9c66a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00000000000000b4
R13: 000056198e99c9e0 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10525 jiffies! g14845 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:28016 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
 schedule+0xb9/0x180 kernel/sched/core.c:6638
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x303/0x1340 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x99/0x3b0 kernel/rcu/tree.c:1905
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 5711 Comm: syz.1.284 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:check_kcov_mode kernel/kcov.c:182 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:245 [inline]
RIP: 0010:__sanitizer_cov_trace_switch+0x64/0xe0 kernel/kcov.c:349
Code: 26 90 8a 48 8b 54 24 20 65 4c 8b 05 26 f8 7f 7e 45 31 c9 eb 08 49 ff c1 4c 39 c8 74 77 4e 8b 54 ce 10 65 44 8b 1d 14 f8 7f 7e <41> 81 e3 00 01 ff 00 74 13 41 81 fb 00 01 00 00 75 d9 41 83 b8 1c
RSP: 0018:ffffc9000cbbf8a8 EFLAGS: 00000206
RAX: 0000000000000012 RBX: ffff0a00ffffff00 RCX: 0000000000000001
RDX: ffffffff8a1d25de RSI: ffffffff8e08db60 RDI: 0000000000000000
RBP: ffffffff8ad8570e R08: ffff888055625940 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000080000000 R12: 0000000000000000
R13: 0000000000000013 R14: 0000000000000001 R15: ffffffff8ad8570d
FS:  00007f3208e216c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ea1cff8 CR3: 0000000057bdf000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 vsnprintf+0x10e/0x1c20 lib/vsprintf.c:2761
 tomoyo_supervisor+0x15c/0x11a0 security/tomoyo/common.c:2060
 tomoyo_audit_net_log security/tomoyo/network.c:367 [inline]
 tomoyo_audit_unix_log security/tomoyo/network.c:406 [inline]
 tomoyo_unix_entry security/tomoyo/network.c:574 [inline]
 tomoyo_check_unix_address+0x52f/0x7c0 security/tomoyo/network.c:605
 tomoyo_socket_connect_permission+0x186/0x270 security/tomoyo/network.c:709
 security_socket_connect+0x6c/0xa0 security/security.c:2260
 __sys_connect_file net/socket.c:2006 [inline]
 __sys_connect+0x30f/0x450 net/socket.c:2027
 __do_sys_connect net/socket.c:2037 [inline]
 __se_sys_connect net/socket.c:2034 [inline]
 __x64_sys_connect+0x76/0x80 net/socket.c:2034
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3207f9aeb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3208e21028 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007f3208215fa0 RCX: 00007f3207f9aeb9
RDX: 000000000000006e RSI: 0000200000000000 RDI: 0000000000000005
RBP: 00007f3208008c1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3208216038 R14: 00007f3208215fa0 R15: 00007fffa19b1bd8
 </TASK>