rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P10931/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=67661, q=363 ncpus=2)
task:syz-executor.3 state:R running task stack:28704 pid:10931 tgid:10928 ppid:9912 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0xf15/0x5d00 kernel/sched/core.c:6745
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7067
irqentry_exit+0x36/0x90 kernel/entry/common.c:354
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:200
Code: be b0 01 00 00 e8 a0 ff ff ff 31 c0 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 65 48 8b 15 e4 ec 75 7e 65 8b 05 e5 ec 75 7e a9 00 01
RSP: 0018:ffffc900033ff908 EFLAGS: 00000282
RAX: 00000000000392be RBX: 0000000000000001 RCX: ffffc9000c1b5000
RDX: 0000000000040000 RSI: ffffffff81c02c6e RDI: ffffc900033ff988
RBP: ffffc900033ff988 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000002 R12: 0000000000000000
R13: 1ffff9200067ff2d R14: ffffc900033ff988 R15: 000000000000004e
xas_load+0x1a/0x5b0 lib/xarray.c:238
filemap_get_entry+0x10f/0x470 mm/filemap.c:1840
shmem_get_folio_gfp+0x369/0x13d0 mm/shmem.c:1982
shmem_get_folio mm/shmem.c:2160 [inline]
shmem_write_begin+0x15a/0x360 mm/shmem.c:2743
generic_perform_write+0x272/0x620 mm/filemap.c:4015
shmem_file_write_iter+0x114/0x140 mm/shmem.c:2919
call_write_iter include/linux/fs.h:2114 [inline]
new_sync_write fs/read_write.c:497 [inline]
vfs_write+0x6b6/0x1140 fs/read_write.c:590
ksys_write+0x12f/0x260 fs/read_write.c:643
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe3bc67bc2f
RSP: 002b:00007fe3bd48fe80 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000080000 RCX: 00007fe3bc67bc2f
RDX: 0000000000080000 RSI: 00007fe3b2400000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000068e
R10: 00000000000007d4 R11: 0000000000000293 R12: 0000000000000003
R13: 00007fe3bd48ff80 R14: 00007fe3bd48ff40 R15: 00007fe3b2400000
rcu: rcu_preempt kthread starved for 10537 jiffies! g67661 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:28752 pid:17 tgid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0xf15/0x5d00 kernel/sched/core.c:6745
preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6924
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
_raw_spin_unlock_irqrestore+0x61/0x80 kernel/locking/spinlock.c:194
__debug_object_init+0x34a/0x480 lib/debugobjects.c:645
init_timer_on_stack_key kernel/time/timer.c:859 [inline]
schedule_timeout+0x102/0x2a0 kernel/time/timer.c:2579
rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2000
rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2202
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 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: 26 Comm: kworker/1:0H Not tainted 6.9.0-syzkaller-10323-g8f6a15f095a6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Workqueue: 0x0 (kblockd)
RIP: 0010:finish_task_switch.isra.0+0x220/0xcc0 kernel/sched/core.c:5282
Code: a9 0a 00 00 44 8b 0d 17 25 86 0e 45 85 c9 0f 85 c0 01 00 00 48 89 df e8 ae f8 ff ff e8 d9 e9 36 00 fb 65 48 8b 1d a0 85 a5 7e <48> 8d bb f8 15 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
RSP: 0018:ffffc90000a0fb30 EFLAGS: 00000206
RAX: 000000000055a36f RBX: ffff888017ee3c00 RCX: 1ffffffff1fc8069
RDX: 0000000000000000 RSI: ffffffff8b2cab60 RDI: ffffffff8b8feec0
RBP: ffffc90000a0fb78 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8fe445d7 R11: 0000000000000000 R12: ffff8880b933f978
R13: ffff88804e17da00 R14: 0000000000000000 R15: ffff8880b933ec00
FS: 0000000000000000(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd1a14a3f80 CR3: 0000000058680000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
context_switch kernel/sched/core.c:5411 [inline]
__schedule+0xf1d/0x5d00 kernel/sched/core.c:6745
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7067
irqentry_exit+0x36/0x90 kernel/entry/common.c:354
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:preempt_count_sub+0x63/0x160 kernel/sched/core.c:5909
Code: 57 13 85 c9 75 1b 65 8b 05 32 4c a6 7e 89 c2 81 e2 ff ff ff 7f 39 d3 7f 17 81 fb fe 00 00 00 76 71 f7 db 65 01 1d 15 4c a6 7e <5b> c3 cc cc cc cc 90 e8 b1 23 23 03 85 c0 74 51 48 c7 c0 94 78 e4
RSP: 0018:ffffc90000a0fdf0 EFLAGS: 00000257
RAX: 0000000000000001 RBX: 00000000ffffffff RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff8b2cab60 RDI: 0000000000000001
RBP: ffffed1002fdc780 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff8fe445d7 R11: 0000000000000000 R12: ffff888017ee3c2c
R13: ffff888017ee3c00 R14: ffffed1002e5c948 R15: fffffbfff1b01e40
__schedule_loop kernel/sched/core.c:6823 [inline]
schedule+0xf1/0x350 kernel/sched/core.c:6837
worker_thread+0x2de/0xf70 kernel/workqueue.c:3408
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244