rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P7444/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=213317, q=558 ncpus=2)
task:kworker/u8:33 state:R running task stack:24056 pid:7444 tgid:7444 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: krds_cp_wq#15/1 rds_connect_worker
Call Trace:
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x10e9/0x6820 kernel/sched/core.c:7188
preempt_schedule_notrace+0x5f/0xd0 kernel/sched/core.c:7462
preempt_schedule_notrace_thunk+0x16/0x30 arch/x86/entry/thunk.S:13
rcu_is_watching+0x8e/0xc0 kernel/rcu/tree.c:753
rcu_read_lock include/linux/rcupdate.h:839 [inline]
__inet6_bind+0x12c1/0x1b40 net/ipv6/af_inet6.c:336
inet6_bind_sk net/ipv6/af_inet6.c:449 [inline]
inet6_bind_sk net/ipv6/af_inet6.c:426 [inline]
inet6_bind+0xdb/0x120 net/ipv6/af_inet6.c:455
kernel_bind+0xff/0x160 net/socket.c:3660
rds_tcp_conn_path_connect+0x554/0xaa0 net/rds/tcp_connect.c:175
rds_connect_worker+0x1b4/0x2d0 net/rds/threads.c:176
process_one_work+0xa0e/0x1980 kernel/workqueue.c:3302
process_scheduled_works kernel/workqueue.c:3385 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3466
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: rcu_preempt kthread timer wakeup didn't happen for 10497 jiffies! g213317 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=110629
rcu: rcu_preempt kthread starved for 10498 jiffies! g213317 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27992 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x10e9/0x6820 kernel/sched/core.c:7188
__schedule_loop kernel/sched/core.c:7267 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:7282
schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2297
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 26874 Comm: syz.2.5902 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:lock_is_held_type+0xe2/0x140 kernel/locking/lockdep.c:5942
Code: b6 c0 48 c7 c7 91 a9 ef 8d 89 44 24 04 e8 56 17 00 00 ba ff ff ff ff 65 0f c1 15 f1 e5 80 08 83 fa 01 8b 44 24 04 75 2d 9c 5a <80> e6 02 75 47 41 f7 c5 00 02 00 00 74 01 fb 48 83 c4 08 5b 5d 41
RSP: 0018:ffffc90000007d98 EFLAGS: 00000046
RAX: 0000000000000001 RBX: ffff88804b93d2c0 RCX: 0000000000000001
RDX: 0000000000000046 RSI: ffffffff8defa991 RDI: ffffffff8c1c3600
RBP: ffff8880392ca500 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 00000000ffffffff
R13: 0000000000000046 R14: ffff8880392cb0b8 R15: 0000000000000001
FS: 00007f29fddd16c0(0000) GS:ffff888124376000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8b7fdec4b8 CR3: 000000008c8ff000 CR4: 00000000003526f0
Call Trace:
lock_is_held include/linux/lockdep.h:249 [inline]
advance_sched+0x8c6/0xd20 net/sched/sch_taprio.c:931
__run_hrtimer kernel/time/hrtimer.c:1930 [inline]
__hrtimer_run_queues+0x470/0xa00 kernel/time/hrtimer.c:1994
hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2113
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
__sysvec_apic_timer_interrupt+0x10b/0x460 arch/x86/kernel/apic/apic.c:1067
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1061
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:198
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 e6 84 57 f6 48 89 df e8 be d4 57 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 05 a8 47 f6 65 8b 05 fe ae 7d 08 85 c0 74 16 5b
RSP: 0018:ffffc9000807f838 EFLAGS: 00000246
RAX: 0000000000000006 RBX: ffff8880361d7e00 RCX: 0000000000000040
RDX: 0000000000000000 RSI: ffffffff8df1fea8 RDI: ffffffff8c1c3600
RBP: 0000000000000286 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffff8880361d7c90
R13: ffff8880361d7e40 R14: ffff8880361d77e8 R15: ffff88805979c640
__unix_dgram_recvmsg+0x31a/0xc30 net/unix/af_unix.c:2612
unix_dgram_recvmsg+0xcd/0x100 net/unix/af_unix.c:2686
sock_recvmsg_nosec net/socket.c:1137 [inline]
____sys_recvmsg+0x5b3/0x640 net/socket.c:2916
___sys_recvmsg+0x16a/0x1a0 net/socket.c:2960
do_recvmmsg+0x301/0x760 net/socket.c:3055
__sys_recvmmsg net/socket.c:3129 [inline]
__do_sys_recvmmsg net/socket.c:3152 [inline]
__se_sys_recvmmsg net/socket.c:3145 [inline]
__x64_sys_recvmmsg+0x22a/0x280 net/socket.c:3145
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f29fcf9cdd9
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:00007f29fddd1028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f29fd216090 RCX: 00007f29fcf9cdd9
RDX: 00000000080002c1 RSI: 0000200000000040 RDI: 0000000000000007
RBP: 00007f29fd032d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f29fd216128 R14: 00007f29fd216090 R15: 00007ffd8fbc6cc8