rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=6bd4/1/0x4000000000000000 softirq=46022/46023 fqs=45
rcu: 	(detected by 1, t=10506 jiffies, g=57405, q=340 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 12224 Comm: syz.1.1859 Not tainted 6.11.0-rc2-syzkaller-00042-gcf6d429eb656 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
RIP: 0010:check_kcov_mode kernel/kcov.c:182 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:245 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp1+0x18/0x90 kernel/kcov.c:299
Code: 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 4c 8b 04 24 65 48 8b 14 25 00 d7 03 00 65 8b 05 a0 5d 70 7e <25> 00 01 ff 00 74 10 3d 00 01 00 00 75 5b 83 ba 1c 16 00 00 00 74
RSP: 0018:ffffc90000007d58 EFLAGS: 00000046
RAX: 0000000000010002 RBX: 0000000000000001 RCX: ffff88806d39da00
RDX: ffff88806d39da00 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000007ea8 R08: ffffffff8180be12 R09: 1ffffffff1fed33d
R10: dffffc0000000000 R11: fffffbfff1fed33e R12: 1ffff1101724593b
R13: dffffc0000000000 R14: ffff888068091340 R15: ffff8880b922c880
FS:  000055559214f500(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020003c80 CR3: 000000006edf0000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 __remove_hrtimer kernel/time/hrtimer.c:1115 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1669 [inline]
 __hrtimer_run_queues+0x3b2/0xd50 kernel/time/hrtimer.c:1753
 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1815
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
 __sysvec_apic_timer_interrupt+0x110/0x3f0 arch/x86/kernel/apic/apic.c:1049
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:raw_spin_rq_unlock_irq+0x19/0x90 kernel/sched/sched.h:1428
Code: 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 57 41 56 53 48 89 fb eb 18 48 89 df e8 ce 35 52 0a e8 c9 c0 35 00 fb 5b <41> 5e 41 5f c3 cc cc cc cc f3 0f 1e fa 49 bf 00 00 00 00 00 fc ff
RSP: 0018:ffffc900033df6a8 EFLAGS: 00000286
RAX: 742b9f8c9ba7fd00 RBX: ffff8880b923e9c0 RCX: ffffffff94ce6903
RDX: dffffc0000000000 RSI: ffffffff8bead560 RDI: ffffffff8c3f8b40
RBP: ffffc900033df8b0 R08: ffffffff8ff699ef R09: 1ffffffff1fed33d
R10: dffffc0000000000 R11: fffffbfff1fed33e R12: 0000000000000002
R13: 0000000000000000 R14: ffff8880b923f758 R15: dffffc0000000000
 __schedule+0x19e8/0x4a10 kernel/sched/core.c:6533
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6851
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:709
RIP: 0010:futex_wait_queue+0x166/0x1d0 kernel/futex/waitwake.c:372
Code: 89 eb 74 6c e8 3b 9e 0c 00 48 8b 2c 24 e8 e2 d5 2e 0a 42 80 7c 3d 00 00 74 08 48 89 df e8 22 b7 70 00 4c 89 33 48 8b 54 24 08 <48> 89 d0 48 c1 e8 03 42 0f b6 04 38 84 c0 75 3d c7 02 00 00 00 00
RSP: 0018:ffffc900033dfa38 EFLAGS: 00000246
RAX: 0000000000400040 RBX: ffff88806d39f160 RCX: 0000000000000001
RDX: ffff88806d39da18 RSI: ffffffff8bead560 RDI: 0000000000000001
RBP: 1ffff1100da73e2c R08: ffffffff8ff699ef R09: 1ffffffff1fed33d
R10: dffffc0000000000 R11: fffffbfff1fed33e R12: ffffc900033dfc80
R13: ffffc900033dfaf8 R14: ffffffff8186d6f7 R15: dffffc0000000000
 __futex_wait+0x17f/0x320 kernel/futex/waitwake.c:669
 futex_wait+0x101/0x360 kernel/futex/waitwake.c:697
 do_futex+0x33b/0x560 kernel/futex/syscalls.c:102
 __do_sys_futex kernel/futex/syscalls.c:179 [inline]
 __se_sys_futex+0x3f9/0x480 kernel/futex/syscalls.c:160
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdea89779f9
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:00007ffe457d7c98 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 000000000007bf27 RCX: 00007fdea89779f9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fdea8b06064
RBP: 00007fdea8b06064 R08: 00007fdea8b05f80 R09: 00007ffe457d7f7f
R10: 00007ffe457d7d90 R11: 0000000000000246 R12: 0000000000000032
R13: 00007ffe457d7d90 R14: 00007ffe457d7db0 R15: 000000000007bef5
 </TASK>
rcu: rcu_preempt kthread starved for 10280 jiffies! g57405 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:25816 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x17ae/0x4a10 kernel/sched/core.c:6529
 __schedule_loop kernel/sched/core.c:6606 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6621
 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2034
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2236
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 1126 Comm: kworker/u8:7 Not tainted 6.11.0-rc2-syzkaller-00042-gcf6d429eb656 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Workqueue: writeback wb_workfn (flush-8:0)
RIP: 0010:smp_call_function_many_cond+0x1878/0x29d0 kernel/smp.c:856
Code: 00 00 00 00 fc ff df 75 07 e8 24 10 0c 00 eb 38 f3 90 42 0f b6 04 23 84 c0 75 11 41 f7 45 00 01 00 00 00 74 1e e8 08 10 0c 00 <eb> e4 44 89 e9 80 e1 07 80 c1 03 38 c1 7c e2 4c 89 ef e8 d1 27 70
RSP: 0018:ffffc900042f5ec0 EFLAGS: 00000293
RAX: ffffffff81876648 RBX: 1ffff11017248c61 RCX: ffff888022829e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900042f60a0 R08: ffffffff81876617 R09: 1ffff9200085ebc8
R10: dffffc0000000000 R11: ffffffff8142d5e0 R12: dffffc0000000000
R13: ffff8880b9246308 R14: ffff8880b933fb40 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff2eb1020c0 CR3: 000000001c6fc000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1023
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:941 [inline]
 flush_tlb_mm_range+0x329/0x5c0 arch/x86/mm/tlb.c:1027
 flush_tlb_page arch/x86/include/asm/tlbflush.h:254 [inline]
 ptep_clear_flush+0x11a/0x170 mm/pgtable-generic.c:101
 page_vma_mkclean_one+0x58a/0x9a0 mm/rmap.c:1029
 page_mkclean_one+0x280/0x420 mm/rmap.c:1070
 rmap_walk_file+0x52f/0x9f0 mm/rmap.c:2687
 rmap_walk mm/rmap.c:2705 [inline]
 folio_mkclean+0x262/0x440 mm/rmap.c:1102
 folio_clear_dirty_for_io+0x22b/0xcf0 mm/page-writeback.c:3024
 mpage_submit_folio+0x88/0x230 fs/ext4/inode.c:1924
 mpage_process_page_bufs+0x6c9/0x8d0 fs/ext4/inode.c:2056
 mpage_prepare_extent_to_map+0xec7/0x1c80 fs/ext4/inode.c:2564
 ext4_do_writepages+0xc52/0x3d40 fs/ext4/inode.c:2706
 ext4_writepages+0x213/0x3c0 fs/ext4/inode.c:2842
 do_writepages+0x35d/0x870 mm/page-writeback.c:2683
 __writeback_single_inode+0x165/0x10b0 fs/fs-writeback.c:1651
 writeback_sb_inodes+0x99c/0x1380 fs/fs-writeback.c:1947
 __writeback_inodes_wb+0x11b/0x260 fs/fs-writeback.c:2018
 wb_writeback+0x495/0xd40 fs/fs-writeback.c:2129
 wb_check_old_data_flush fs/fs-writeback.c:2233 [inline]
 wb_do_writeback fs/fs-writeback.c:2286 [inline]
 wb_workfn+0xba1/0x1090 fs/fs-writeback.c:2314
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
 worker_thread+0x86d/0xd40 kernel/workqueue.c:3390
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>