rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5791/1:b..l
rcu: (detected by 0, t=10503 jiffies, g=9037, q=33 ncpus=2)
task:udevd state:R running task stack:27592 pid:5791 ppid:5160 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5380 [inline]
__schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
preempt_schedule_irq+0xb5/0x140 kernel/sched/core.c:7009
irqentry_exit+0x67/0x70 kernel/entry/common.c:438
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:lock_is_held_type+0x13e/0x190 kernel/locking/lockdep.c:5830
Code: 75 40 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 46 41 f7 c5 00 02 00 00 74 01 fb 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 08 75 3c 89 e8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0000:ffffc900044bfb38 EFLAGS: 00000206
RAX: 7b4d73177b356000 RBX: ffff88806a1abc00 RCX: 7b4d73177b356000
RDX: 0000000000000000 RSI: ffffffff8aaace60 RDI: ffffffff8afc6b00
RBP: 0000000000000000 R08: dffffc0000000000 R09: 1ffffffff21b50a0
R10: dffffc0000000000 R11: fffffbfff21b50a1 R12: 0000000000000002
R13: 0000000000000246 R14: ffffffff8cd598b8 R15: ffff88806a1ac730
lock_is_held include/linux/lockdep.h:288 [inline]
task_css include/linux/cgroup.h:436 [inline]
mem_cgroup_from_task+0x77/0x110 mm/memcontrol.c:1009
count_memcg_event_mm+0x19a/0x3b0 include/linux/memcontrol.h:1101
mm_account_fault mm/memory.c:5200 [inline]
handle_mm_fault+0x2857/0x4920 mm/memory.c:5347
do_user_addr_fault+0xad0/0x12e0 arch/x86/mm/fault.c:1324
handle_page_fault arch/x86/mm/fault.c:1465 [inline]
exc_page_fault+0x67/0x110 arch/x86/mm/fault.c:1521
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7fbce2ddedd9
RSP: 002b:00007ffe136da0e0 EFLAGS: 00010246
RAX: 00007fbce2f17b20 RBX: 0000000000001010 RCX: 0000000000000040
RDX: 0000560274865a00 RSI: 00007fbce2f18140 RDI: 00005602748649f0
RBP: 00007fbce2f17ac0 R08: 00000000000000ff R09: 0000000000000000
R10: 00007fbce2f17b50 R11: 000000000000000c R12: 0000000000001000
R13: 00005602748649f0 R14: 0000000000001050 R15: 00007fbce2f17b20
rcu: rcu_preempt kthread starved for 10533 jiffies! g9037 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:27752 pid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5380 [inline]
__schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
schedule+0xbd/0x170 kernel/sched/core.c:6773
schedule_timeout+0x160/0x280 kernel/time/timer.c:2167
rcu_gp_fqs_loop+0x302/0x1560 kernel/rcu/tree.c:1667
rcu_gp_kthread+0x99/0x380 kernel/rcu/tree.c:1866
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 5798 Comm: syz-executor326 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:lock_is_held_type+0x13e/0x190 kernel/locking/lockdep.c:5830
Code: 75 40 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 46 41 f7 c5 00 02 00 00 74 01 fb 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 08 75 3c 89 e8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc9000456fb38 EFLAGS: 00000206
RAX: 966e4a683c209e00 RBX: ffff88802ebf5a00 RCX: 966e4a683c209e00
RDX: 0000000000000000 RSI: ffffffff8aaace60 RDI: ffffffff8afc6b00
RBP: 0000000000000000 R08: ffffc9000456fe5f R09: 0000000000000000
R10: ffffc9000456fd60 R11: fffff520008adfcc R12: dffffc0000000000
R13: 0000000000000246 R14: ffffffff8cd2ff40 R15: 00000000ffffffff
FS: 00007f8f228326c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8f22831f80 CR3: 000000002e2ac000 CR4: 00000000003506f0
Call Trace:
lock_is_held include/linux/lockdep.h:288 [inline]
__might_resched+0xa7/0x610 kernel/sched/core.c:10170
__might_fault+0x71/0x120 mm/memory.c:5944
_copy_from_user+0x2a/0xe0 lib/usercopy.c:14
copy_from_user include/linux/uaccess.h:183 [inline]
restore_sigcontext arch/x86/kernel/signal_64.c:59 [inline]
__ia32_sys_rt_sigreturn+0x27a/0x7b0 arch/x86/kernel/signal_64.c:266
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f8f22844aa9
Code: 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 04 25
RSP: 002b:00007f8f22831bc0 EFLAGS: 00000202 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007f8f228fc308 RCX: 00007f8f22844aa9
RDX: 00007f8f22831bc0 RSI: 00007f8f22831cf0 RDI: 0000000000000021
RBP: 00007f8f228fc300 R08: 0000000000000000 R09: 00007f8f228326c0
R10: 00007f8f228326c0 R11: 0000000000000202 R12: 00007f8f228fc30c
R13: 0000000000000000 R14: 00007ffc9d6d9f10 R15: 00007ffc9d6d9ff8