rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5952/1:b..l
rcu: (detected by 1, t=10503 jiffies, g=14957, q=680 ncpus=2)
task:syz-executor.4 state:R running task stack:25808 pid:5952 tgid:5950 ppid:5134 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0x17e8/0x4a50 kernel/sched/core.c:6745
preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7067
irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5758
Code: 2b 00 74 08 4c 89 f7 e8 0a 92 89 00 f6 44 24 61 02 0f 85 85 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc90016437680 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff92002c86edc RCX: 0000000000000001
RDX: dffffc0000000000 RSI: ffffffff8bcaca00 RDI: ffffffff8c1fe1a0
RBP: ffffc900164377c8 R08: ffffffff92fb1587 R09: 1ffffffff25f62b0
R10: dffffc0000000000 R11: fffffbfff25f62b1 R12: 1ffff92002c86ed8
R13: dffffc0000000000 R14: ffffc900164376e0 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
rcu_read_lock include/linux/rcupdate.h:781 [inline]
filemap_get_entry+0x144/0x4e0 mm/filemap.c:1837
shmem_get_folio_gfp+0x2a8/0x1f50 mm/shmem.c:1982
shmem_get_folio mm/shmem.c:2160 [inline]
shmem_write_begin+0x170/0x4d0 mm/shmem.c:2743
generic_perform_write+0x324/0x640 mm/filemap.c:4015
shmem_file_write_iter+0xfc/0x120 mm/shmem.c:2919
call_write_iter include/linux/fs.h:2114 [inline]
new_sync_write fs/read_write.c:497 [inline]
vfs_write+0xa74/0xc90 fs/read_write.c:590
ksys_write+0x1a0/0x2c0 fs/read_write.c:643
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fef9607bc2f
RSP: 002b:00007fef96d07e80 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000001000000 RCX: 00007fef9607bc2f
RDX: 0000000001000000 RSI: 00007fef8be00000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000006197
R10: 00000000200012c2 R11: 0000000000000293 R12: 0000000000000003
R13: 00007fef96d07f80 R14: 00007fef96d07f40 R15: 00007fef8be00000
rcu: rcu_preempt kthread starved for 5630 jiffies! g14957 f0x0 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:26320 pid:17 tgid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0x17e8/0x4a50 kernel/sched/core.c:6745
__schedule_loop kernel/sched/core.c:6822 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6837
schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581
rcu_gp_fqs_loop+0x2df/0x1370 kernel/rcu/tree.c:2000
rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2202
kthread+0x2f2/0x390 kernel/kthread.c:389
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 PID: 5973 Comm: syz-executor.0 Not tainted 6.9.0-syzkaller-10323-g8f6a15f095a6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0033:0x7f976dea4670
Code: 83 c0 16 83 e0 f7 74 12 50 48 8d 3d 3a 9b 04 00 e8 25 78 fa ff 0f 1f 44 00 00 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 <83> ff 21 74 0b c3 66 2e 0f 1f 84 00 00 00 00 00 55 53 48 89 f3 48
RSP: 002b:00007f976ec6cbb8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007f976dfac058 RCX: 00007f976de7cee9
RDX: 00007f976ec6cbc0 RSI: 00007f976ec6ccf0 RDI: 0000000000000021
RBP: 00007f976dfac050 R08: 00007f976ec6d6c0 R09: 00007f976ec6d6c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f976dfac05c
R13: 000000000000006e R14: 00007ffd4e46d900 R15: 00007ffd4e46d9e8
FS: 00007f976ec6d6c0 GS: 0000000000000000