rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=1d1c/1/0x4000000000000000 softirq=183844/183845 fqs=1243
rcu: 	(detected by 0, t=10502 jiffies, g=306421, q=1895 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5548 Comm: syz-executor.0 Not tainted 6.8.0-rc1-syzkaller-00005-g610347effc2e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:__rcu_read_lock+0xaa/0xf0 kernel/rcu/tree_plugin.h:404
Code: b8 00 00 00 00 00 fc ff df 89 9d 3c 04 00 00 65 48 8b 1c 25 80 c2 03 00 48 8d bb 3c 04 00 00 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 17 8b 83 3c 04 00
RSP: 0018:ffffc900001f0d78 EFLAGS: 00000017
RAX: dffffc0000000000 RBX: ffff88807b665940 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88807b665d7c
RBP: ffff88807b665940 R08: 0000000000000000 R09: ffffed100f9c7a5d
R10: ffff88807ce3d2eb R11: 0000000000000000 R12: 0000000000000002
R13: ffff88807b4ca000 R14: ffff88807ce3d340 R15: ffff88807b4ca800
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1e2c7a8000 CR3: 00000000794fd000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 rcu_read_lock include/linux/rcupdate.h:748 [inline]
 advance_sched+0x65c/0xc60 net/sched/sch_taprio.c:996
 __run_hrtimer kernel/time/hrtimer.c:1688 [inline]
 __hrtimer_run_queues+0x203/0xc20 kernel/time/hrtimer.c:1752
 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1814
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline]
 __sysvec_apic_timer_interrupt+0x105/0x400 arch/x86/kernel/apic/apic.c:1082
 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1076
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:lock_release+0x3b8/0x690 kernel/locking/lockdep.c:5762
Code: 7e 83 f8 01 0f 85 c8 01 00 00 9c 58 f6 c4 02 0f 85 b3 01 00 00 48 f7 04 24 00 02 00 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c5 48 c7 45 00 00 00 00 00 c7 45 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffffc900144afae8 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: ffffffffffffffff RCX: ffffc900144afb38
RDX: 1ffff1100f6ccc7e RSI: ffffffff8accb180 RDI: ffffffff8b2fd240
RBP: 1ffff92002895f5f R08: 0000000000000000 R09: fffffbfff1e75cf2
R10: ffffffff8f3ae797 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000001 R14: ffff88807b6663f8 R15: ffff88807b665940
 __might_fault mm/memory.c:6060 [inline]
 __might_fault+0x158/0x1a0 mm/memory.c:6053
 mm_release+0x209/0x300 kernel/fork.c:1633
 exit_mm kernel/exit.c:542 [inline]
 do_exit+0x86d/0x2ad0 kernel/exit.c:858
 do_group_exit+0xd4/0x2a0 kernel/exit.c:1020
 get_signal+0x23b5/0x2790 kernel/signal.c:2893
 arch_do_signal_or_restart+0x90/0x7f0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:105 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
 syscall_exit_to_user_mode+0x156/0x2b0 kernel/entry/common.c:212
 do_syscall_64+0xe0/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f1e2c67cda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1e2d3d6178 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f1e2c7abf88 RCX: 00007f1e2c67cda9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f1e2c7abf88
RBP: 00007f1e2c7abf80 R08: 00007f1e2d3d66c0 R09: 00007f1e2d3d66c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1e2c7abf8c
R13: 000000000000000b R14: 00007ffffb213c20 R15: 00007ffffb213d08
 </TASK>
rcu: rcu_preempt kthread starved for 8015 jiffies! g306421 f0x0 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:27984 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0xf12/0x5c00 kernel/sched/core.c:6727
 __schedule_loop kernel/sched/core.c:6802 [inline]
 schedule+0xe9/0x270 kernel/sched/core.c:6817
 schedule_timeout+0x137/0x290 kernel/time/timer.c:2183
 rcu_gp_fqs_loop+0x1ec/0xb10 kernel/rcu/tree.c:1631
 rcu_gp_kthread+0x24b/0x380 kernel/rcu/tree.c:1830
 kthread+0x2c6/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 6200 Comm: syz-executor.3 Not tainted 6.8.0-rc1-syzkaller-00005-g610347effc2e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x0/0x20 kernel/kcov.c:303
Code: e6 fe ff ff 66 0f 1f 44 00 00 f3 0f 1e fa 48 8b 0c 24 0f b7 d6 0f b7 f7 bf 03 00 00 00 e9 c8 fe ff ff 0f 1f 84 00 00 00 00 00 <f3> 0f 1e fa 48 8b 0c 24 89 f2 89 fe bf 05 00 00 00 e9 aa fe ff ff
RSP: 0018:ffffc9000d6b7888 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffff8880b9942020 RCX: ffffffff817c5d08
RDX: ffff888034cf0000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffffed1017328405
R13: 0000000000000001 R14: ffff8880b9942028 R15: ffff8880b983de80
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c00008bfc0 CR3: 0000000030788000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 csd_lock_wait kernel/smp.c:311 [inline]
 smp_call_function_many_cond+0x508/0x1550 kernel/smp.c:855
 on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1023
 invalidate_bdev+0x95/0xd0 block/bdev.c:88
 ext4_put_super+0x535/0xe20 fs/ext4/super.c:1361
 generic_shutdown_super+0x159/0x3d0 fs/super.c:646
 kill_block_super+0x3b/0x90 fs/super.c:1680
 ext4_kill_sb+0x6a/0xb0 fs/ext4/super.c:7319
 deactivate_locked_super+0xbc/0x1a0 fs/super.c:477
 deactivate_super+0xde/0x100 fs/super.c:510
 cleanup_mnt+0x222/0x450 fs/namespace.c:1267
 task_work_run+0x14d/0x240 kernel/task_work.c:180
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xa8a/0x2ad0 kernel/exit.c:871
 do_group_exit+0xd4/0x2a0 kernel/exit.c:1020
 get_signal+0x23b5/0x2790 kernel/signal.c:2893
 arch_do_signal_or_restart+0x90/0x7f0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:105 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
 syscall_exit_to_user_mode+0x156/0x2b0 kernel/entry/common.c:212
 do_syscall_64+0xe0/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fe0588a81b5
Code: Unable to access opcode bytes at 0x7fe0588a818b.
RSP: 002b:00007fe05956b010 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: fffffffffffffdfc RBX: 00007fe0589abf80 RCX: 00007fe0588a81b5
RDX: 00007fe05956b050 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fe0588c947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 000000000000000b R14: 00007fe0589abf80 R15: 00007ffe6eb61798
 </TASK>