rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10002 jiffies, g=2873, q=102 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10003 (4294954482-4294944479), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10004 jiffies! g2873 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:14392 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:
CPU: 0 PID: 3905 Comm: syz.4.17 Not tainted 6.7.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:trace_block_touch_buffer include/trace/events/block.h:46 [inline]
RIP: 0010:touch_buffer fs/buffer.c:64 [inline]
RIP: 0010:__find_get_block+0x10b/0x4e0 fs/buffer.c:1405
Code: 89 03 48 83 c3 f8 48 ff c5 75 d6 48 c7 c7 68 7a 16 83 e8 88 d5 27 01 65 4c 89 35 58 64 ca 7e f0 41 ff 46 60 fb 0f 1f 44 00 00 <65> 8b 05 ca 99 ca 7e 89 c0 48 0f a3 05 9c c4 4d 02 73 05 e8 2d 90
RSP: 0018:ffffc90001e9fc30 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 0000000000029848 RCX: 0000000000108c48
RDX: 0000000000000200 RSI: ffffffff831986bc RDI: ffffffff830c19c7
RBP: 0000000000000000 R08: 000000000000000d R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000200
R13: ffff888110503700 R14: ffff88817980e1f8 R15: 0000000000000080
FS:  00007ffaf71d66c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2db5ffff CR3: 0000000105b0c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 bdev_getblk+0x22/0x320 fs/buffer.c:1423
 __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: 0033:0x7ffaf638d169
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:00007ffaf71d6038 EFLAGS: 00000246 ORIG_RAX: 000000000000004c
RAX: ffffffffffffffda RBX: 00007ffaf65a5fa0 RCX: 00007ffaf638d169
RDX: 0000000000000000 RSI: 000000000000f000 RDI: 0000400000000080
RBP: 00007ffaf640e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ffaf65a5fa0 R15: 00007ffc20e74558
 </TASK>