rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=8769, q=4229 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294955699-4294945197), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g8769 f0x2 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:27704 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5282 [inline]
 __schedule+0x14ed/0x5040 kernel/sched/core.c:6894
 __schedule_loop kernel/sched/core.c:6976 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6991
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x11b0 kernel/rcu/tree.c:2095
 rcu_gp_kthread+0x9b/0x2d0 kernel/rcu/tree.c:2297
 kthread+0x389/0x480 kernel/kthread.c:467
 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
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: 5832 Comm: syz-executor229 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__lock_acquire+0x88b/0x2cf0 kernel/locking/lockdep.c:5233
Code: c1 c5 13 31 d5 01 f3 29 ee 01 eb c1 c5 04 31 f5 48 c1 e5 20 83 3d 98 ec 25 0e 00 4d 89 e5 0f 85 1f 02 00 00 48 83 7c 24 28 00 <0f> 84 b3 01 00 00 41 8b 45 f8 25 ff 1f 00 00 48 0f a3 05 4e b4 2f
RSP: 0018:ffffc9000410f450 EFLAGS: 00000046
RAX: 0000000000002966 RBX: 000000008e99e7f8 RCX: 0000000000294dbd
RDX: 000000004e4f2383 RSI: 0000000022c3d981 RDI: ffff888032838000
RBP: f3e939ec00000000 R08: ffffffff821c76c0 R09: ffffffff8e44d960
R10: dffffc0000000000 R11: fffffbfff1f87f8f R12: ffff888032838b08
R13: ffff888032838b08 R14: ffff888032838000 R15: 0000000000000000
FS:  00005555655e7380(0000) GS:ffff8881259bd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560fbc63eff8 CR3: 0000000073ed0000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 lock_acquire+0x107/0x340 kernel/locking/lockdep.c:5868
 __fs_reclaim_acquire mm/page_alloc.c:4341 [inline]
 fs_reclaim_acquire+0x72/0x100 mm/page_alloc.c:4355
 might_alloc include/linux/sched/mm.h:317 [inline]
 slab_pre_alloc_hook mm/slub.c:4920 [inline]
 slab_alloc_node mm/slub.c:5259 [inline]
 __kmalloc_cache_noprof+0x40/0x700 mm/slub.c:5791
 kmalloc_noprof include/linux/slab.h:957 [inline]
 tty_alloc_file drivers/tty/tty_io.c:186 [inline]
 tty_open+0x947/0xd10 drivers/tty/tty_io.c:2114
 chrdev_open+0x4cc/0x5e0 fs/char_dev.c:411
 do_dentry_open+0x785/0x14e0 fs/open.c:962
 vfs_open+0x3b/0x340 fs/open.c:1094
 do_open fs/namei.c:4634 [inline]
 path_openat+0x2de0/0x3840 fs/namei.c:4793
 do_filp_open+0x1fa/0x410 fs/namei.c:4820
 do_sys_openat2+0x121/0x200 fs/open.c:1391
 do_sys_open fs/open.c:1397 [inline]
 __do_sys_openat fs/open.c:1413 [inline]
 __se_sys_openat fs/open.c:1408 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1408
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f120d528be9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffce416a508 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f120d528be9
RDX: 0000000000000000 RSI: 0000200000000000 RDI: ffffffffffffff9c
RBP: 00000000000f4240 R08: 00000000000000a0 R09: 00000000000000a0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000013b8e
R13: 00007ffce416a51c R14: 00007ffce416a530 R15: 00007ffce416a520
 </TASK>