rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=a5cc/1/0x4000000000000000 softirq=43342/43342 fqs=0
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P3483/1:b..l
rcu: 	(detected by 1, t=10506 jiffies, g=35241, q=352 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 9623 Comm: syz.2.1546 Not tainted 6.16.0-rc5-syzkaller-00193-g40f92e79b0aa #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:lock_acquire+0x4/0x360 kernel/locking/lockdep.c:5831
Code: 10 a9 00 ff ff 00 0f 95 c0 c3 cc cc cc cc cc 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <55> 41 57 41 56 41 55 41 54 53 48 83 ec 60 4d 89 ce 45 89 c7 41 89
RSP: 0018:ffffc90000007c50 EFLAGS: 00000046
RAX: 0000000000010002 RBX: ffff8880281d12e8 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880281d1300
RBP: 0000000000000002 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffffff89879e40 R12: ffff8880281d1340
R13: ffff8880281d1000 R14: dffffc0000000000 R15: ffff888054c1e4d8
FS:  00007f955bba66c0(0000) GS:ffff888125c4f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000157000 CR3: 000000007aa58000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 advance_sched+0xc4/0xc90 net/sched/sch_taprio.c:924
 __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
 __hrtimer_run_queues+0x52c/0xc60 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
 __sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1056
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202
Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 5a a8 33 f6 48 89 df e8 b2 3f 34 f6 e8 8d 1b 5d f6 fb bf 01 00 00 00 <e8> 72 3c 26 f6 65 8b 05 3b 6a 32 07 85 c0 74 07 5b c3 cc cc cc cc
RSP: 0018:ffffc90003187730 EFLAGS: 00000286
RAX: 67ba123b68bb1900 RBX: ffff888054fcbe70 RCX: 67ba123b68bb1900
RDX: 0000000000000006 RSI: ffffffff8d985128 RDI: 0000000000000001
RBP: ffffc90003187870 R08: ffffffff8fa0c9f7 R09: 1ffffffff1f4193e
R10: dffffc0000000000 R11: fffffbfff1f4193f R12: ffffc900031877c0
R13: 0000000000000cc0 R14: 0000000000000cc0 R15: 00000003fffffffc
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 shmem_add_to_page_cache+0x863/0xb10 mm/shmem.c:916
 shmem_alloc_and_add_folio+0x846/0xf60 mm/shmem.c:1916
 shmem_get_folio_gfp+0x59d/0x1660 mm/shmem.c:2536
 shmem_get_folio mm/shmem.c:2642 [inline]
 shmem_write_begin+0xf7/0x2b0 mm/shmem.c:3292
 generic_perform_write+0x2c4/0x910 mm/filemap.c:4112
 shmem_file_write_iter+0xf8/0x120 mm/shmem.c:3467
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x548/0xa90 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f955ad8e929
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:00007f955bba6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f955afb5fa0 RCX: 00007f955ad8e929
RDX: 00000000002a979d RSI: 0000200000000000 RDI: 0000000000000005
RBP: 00007f955ae10b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f955afb5fa0 R15: 00007ffe6ebbf0b8
 </TASK>
task:kworker/u8:7    state:R  running task     stack:24216 pid:3483  tgid:3483  ppid:2      task_flags:0x4208160 flags:0x00004000
Workqueue: iou_exit io_ring_exit_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5401 [inline]
 __schedule+0x16a2/0x4cb0 kernel/sched/core.c:6790
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7113
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:307
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__asan_memset+0x31/0x50 mm/kasan/shadow.c:87
Code: 53 48 89 d3 89 f5 49 89 fe 48 8b 4c 24 18 48 89 d6 ba 01 00 00 00 e8 7e e4 ff ff 84 c0 74 11 4c 89 f7 89 ee 48 89 da 5b 41 5e <5d> e9 c9 ac 46 09 31 c0 5b 41 5e 5d e9 0e 62 49 09 cc 66 66 66 66
RSP: 0018:ffffc9000bf27368 EFLAGS: 00000202
RAX: 1ffff920017e4e01 RBX: ffffc9000bf27480 RCX: ffffffff8172b6d8
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffc9000bf27498
RBP: 0000000000000000 R08: ffffc9000bf274a7 R09: 1ffff920017e4e94
R10: dffffc0000000000 R11: fffff520017e4e95 R12: ffffc9000bf27580
R13: ffffc9000bf27498 R14: ffffc9000bf27448 R15: ffffc9000bf27490
 unwind_next_frame+0xc98/0x2390 arch/x86/kernel/unwind_orc.c:592
 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4359
 kmalloc_noprof include/linux/slab.h:905 [inline]
 slab_free_hook mm/slub.c:2333 [inline]
 slab_free mm/slub.c:4643 [inline]
 kmem_cache_free+0x166/0x400 mm/slub.c:4745
 __io_req_caches_free+0x8f/0x140 io_uring/io_uring.c:2709
 io_req_caches_free+0x21/0x30 io_uring/io_uring.c:2721
 io_ring_exit_work+0x415/0x930 io_uring/io_uring.c:2919
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
 kthread+0x711/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10505 jiffies! g35241 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=14298
rcu: rcu_preempt kthread starved for 10506 jiffies! g35241 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27320 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5401 [inline]
 __schedule+0x16a2/0x4cb0 kernel/sched/core.c:6790
 __schedule_loop kernel/sched/core.c:6868 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6883
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2054
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2256
 kthread+0x711/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>