rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10002 jiffies, g=3001, q=49 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10003 (4294955277-4294945274), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10004 jiffies! g3001 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:14520 pid:16    tgid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0x691/0x970 kernel/sched/core.c:6688
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0xab/0x110 kernel/sched/core.c:6778
 schedule_timeout+0x117/0x190 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x17a/0x590 kernel/rcu/tree.c:1631
 rcu_gp_kthread+0x1c/0x110 kernel/rcu/tree.c:1830
 kthread+0xe9/0x100 kernel/kthread.c:388
 ret_from_fork+0x32/0x40 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 3487 Comm: syz.3.16 Not tainted 6.7.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:26 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:67 [inline]
RIP: 0010:check_preemption_disabled+0x5d/0x120 lib/smp_processor_id.c:19
Code: 28 00 00 00 48 3b 44 24 08 0f 85 cd 00 00 00 89 d8 48 83 c4 10 5b 41 5c 41 5e 41 5f c3 cc cc cc cc 48 c7 04 24 00 00 00 00 9c <8f> 04 24 f7 04 24 00 02 00 00 74 c5 49 89 f6 49 89 ff 65 4c 8b 25
RSP: 0018:ffffc9000257fbe0 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 00000000c67358b5
RDX: 6b5a99681b2b244c RSI: ffffffff831d5e1c RDI: ffffffff830c19c7
RBP: ffffffff812a6b8f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000200
R13: ffff88810ce61b00 R14: 0000000000000008 R15: ffffffff83607598
FS:  00007f112dcdb6c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33a5ffff CR3: 000000010676e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 lockdep_recursion_inc kernel/locking/lockdep.c:462 [inline]
 lock_release+0x95/0x2b0 kernel/locking/lockdep.c:5773
 might_alloc include/linux/sched/mm.h:303 [inline]
 bdev_getblk+0x2c/0x320 fs/buffer.c:1425
 __bread_gfp+0x25/0xf0 fs/buffer.c:1474
 sb_bread include/linux/buffer_head.h:324 [inline]
 __exfat_ent_get fs/exfat/fatent.c:48 [inline]
 exfat_ent_get+0x59/0x140 fs/exfat/fatent.c:97
 exfat_find_last_cluster+0x5f/0xd0 fs/exfat/fatent.c:253
 exfat_cont_expand fs/exfat/file.c:39 [inline]
 exfat_setattr+0x17b/0x490 fs/exfat/file.c:299
 notify_change+0x2e9/0x360 fs/attr.c:499
 do_truncate+0xe1/0x120 fs/open.c:66
 vfs_truncate+0xde/0x110 fs/open.c:112
 do_sys_truncate+0x75/0xf0 fs/open.c:135
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x4d/0xf0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f112cd8d169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f112dcdb038 EFLAGS: 00000246 ORIG_RAX: 000000000000004c
RAX: ffffffffffffffda RBX: 00007f112cfa5fa0 RCX: 00007f112cd8d169
RDX: 0000000000000000 RSI: 000000000000e4c8 RDI: 0000400000000140
RBP: 00007f112ce0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f112cfa5fa0 R15: 00007ffe86d9fdd8
 </TASK>