rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P969/1:b..l P5830/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=31665, q=215 ncpus=2)
task:syz-executor state:R running task stack:23136 pid:5830 tgid:5830 ppid:5815 task_flags:0x400140 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0xf43/0x5890 kernel/sched/core.c:6765
preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6944
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
copy_pte_range mm/memory.c:1201 [inline]
copy_pmd_range mm/memory.c:1262 [inline]
copy_pud_range mm/memory.c:1299 [inline]
copy_p4d_range mm/memory.c:1323 [inline]
copy_page_range+0x1e7f/0x5690 mm/memory.c:1421
dup_mmap kernel/fork.c:748 [inline]
dup_mm kernel/fork.c:1700 [inline]
copy_mm kernel/fork.c:1752 [inline]
copy_process+0x7ccb/0x8c50 kernel/fork.c:2403
kernel_clone+0xfd/0x960 kernel/fork.c:2815
__do_sys_clone+0xcf/0x120 kernel/fork.c:2958
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f80263839d3
RSP: 002b:00007ffef7d20a38 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f80263839d3
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 0000555581bd47d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 000000000004d536 R15: 00007ffef7d20bd0
task:kworker/0:2 state:R running task stack:21120 pid:969 tgid:969 ppid:2 task_flags:0x4208060 flags:0x00004000
Workqueue: events_power_efficient gc_worker
Call Trace:
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0xf43/0x5890 kernel/sched/core.c:6765
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7087
irqentry_exit+0x36/0x90 kernel/entry/common.c:354
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire.part.0+0x155/0x380 kernel/locking/lockdep.c:5816
Code: b8 ff ff ff ff 65 0f c1 05 e0 da 6b 7e 83 f8 01 0f 85 d0 01 00 00 9c 58 f6 c4 02 0f 85 e5 01 00 00 48 85 ed 0f 85 b6 01 00 00 <48> b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 00 00 00 00 48 c7
RSP: 0018:ffffc90003b77a70 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 1ffff9200076ef4f RCX: 0000000066f07bde
RDX: 0000000000000001 RSI: ffffffff8b6cef80 RDI: ffffffff8bd35640
RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff2dd8598
R10: ffffffff96ec2cc7 R11: 0000000000000002 R12: 0000000000000000
R13: ffffffff8e1bcc80 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
rcu_read_lock include/linux/rcupdate.h:849 [inline]
gc_worker+0x242/0x16a0 net/netfilter/nf_conntrack_core.c:1532
process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3236
process_scheduled_works kernel/workqueue.c:3317 [inline]
worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398
kthread+0x3af/0x750 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
rcu: rcu_preempt kthread timer wakeup didn't happen for 10547 jiffies! g31665 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=20079
rcu: rcu_preempt kthread starved for 10553 jiffies! g31665 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
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:27552 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0xf43/0x5890 kernel/sched/core.c:6765
__schedule_loop kernel/sched/core.c:6842 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6857
schedule_timeout+0x124/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2024
rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2226
kthread+0x3af/0x750 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 1289 Comm: aoe_tx0 Not tainted 6.14.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__lock_acquire+0xc8c/0x3c40 kernel/locking/lockdep.c:5223
Code: 8d 3c c3 e8 56 c9 c0 09 85 c0 74 c7 4c 8b 6c 24 78 48 c7 c2 30 89 62 90 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 14 02 <48> c7 c0 30 89 62 90 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 b0
RSP: 0018:ffffc9000476f748 EFLAGS: 00000802
RAX: dffffc0000000000 RBX: ced034ad5846f22c RCX: ffffffff81966e42
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 00000000ed034adc
RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff2dd8599
R10: ffffffff96ec2ccf R11: 0000000000000002 R12: ffffed100502b15d
R13: ffff888028158000 R14: 0000000000000003 R15: ffff888028158b40
FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000400000404030 CR3: 0000000063f56000 CR4: 00000000003526f0
Call Trace:
lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
uart_port_lock_irqsave include/linux/serial_core.h:715 [inline]
uart_write+0x13b/0xb30 drivers/tty/serial/serial_core.c:626
handle_tx+0x203/0x630 drivers/net/caif/caif_serial.c:236
__netdev_start_xmit include/linux/netdevice.h:5151 [inline]
netdev_start_xmit include/linux/netdevice.h:5160 [inline]
xmit_one net/core/dev.c:3806 [inline]
dev_hard_start_xmit+0x9a/0x7b0 net/core/dev.c:3822
__dev_queue_xmit+0x7f0/0x43e0 net/core/dev.c:4655
dev_queue_xmit include/linux/netdevice.h:3313 [inline]
tx+0xcc/0x190 drivers/block/aoe/aoenet.c:62
kthread+0x1e7/0x3c0 drivers/block/aoe/aoecmd.c:1237
kthread+0x3af/0x750 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244