rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=2a9c/1/0x4000000000000000 softirq=64368/64371 fqs=1
rcu: 	(detected by 1, t=10506 jiffies, g=57113, q=266 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 14416 Comm: syz.1.2696 Not tainted 6.15.0-rc2-syzkaller-00404-g8560697b23dc #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:advance_sched+0x997/0xca0 net/sched/sch_taprio.c:980
Code: fd e8 ad 15 07 f8 48 89 ef 48 8b 44 24 10 48 89 07 48 89 df 48 8b 34 24 4c 89 f2 e8 23 03 00 00 48 8b 44 24 78 42 80 3c 20 00 <74> 0a 48 8b 7c 24 70 e8 7d 15 07 f8 4d 89 77 e8 48 8b bc 24 80 00
RSP: 0018:ffffc90000007c70 EFLAGS: 00000046
RAX: 1ffff1100b09aa65 RBX: ffff8880584d52c0 RCX: ffff888029173c00
RDX: 0000000000010000 RSI: 0000000000000004 RDI: ffff888029850484
RBP: ffff8880298504c8 R08: ffff888029850487 R09: 1ffff1100530a090
R10: dffffc0000000000 R11: ffffed100530a091 R12: dffffc0000000000
R13: ffff888029850408 R14: ffff888029850400 R15: ffff8880584d5340
FS:  000055558fdd3500(0000) GS:ffff888124f9a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f61b9eed680 CR3: 0000000024ebc000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
 __hrtimer_run_queues+0x5a8/0xd40 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x112/0x420 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:ima_file_mprotect+0x4/0x560 security/integrity/ima/ima_main.c:495
Code: 5d 41 5e 41 5f 5d e9 d6 29 4e fc e8 06 89 6d 07 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <55> 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec 40 02
RSP: 0018:ffffc90003a97c70 EFLAGS: 00000293
RAX: ffffffff84b27561 RBX: ffff88805ff18c80 RCX: ffff888029173c00
RDX: 0000000000000003 RSI: 0000000000000003 RDI: ffff88805ff18c80
RBP: 0000000000000000 R08: ffffffff84b273e1 R09: 1ffff1100fd8e23f
R10: dffffc0000000000 R11: ffffed100fd8e240 R12: 0000000000000003
R13: dffffc0000000000 R14: 0000000000000003 R15: 0000000000000003
 security_file_mprotect+0xf2/0x2a0 security/security.c:3012
 do_mprotect_pkey+0x88c/0xde0 mm/mprotect.c:818
 __do_sys_mprotect mm/mprotect.c:853 [inline]
 __se_sys_mprotect mm/mprotect.c:850 [inline]
 __x64_sys_mprotect+0x80/0x90 mm/mprotect.c:850
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f61b918e227
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 0a 00 00 00 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:00007ffffe8feb08 EFLAGS: 00000206 ORIG_RAX: 000000000000000a
RAX: ffffffffffffffda RBX: 00007f61b9f436c0 RCX: 00007f61b918e227
RDX: 0000000000000003 RSI: 0000000000020000 RDI: 00007f61b9f24000
RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000021000 R11: 0000000000000206 R12: 00007ffffe8fec60
R13: ffffffffffffffc0 R14: 0000000000001000 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10500 jiffies! g57113 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:26952 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x1b88/0x5240 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0x163/0x360 kernel/sched/core.c:6860
 schedule_timeout+0x15b/0x2b0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x2e1/0x1340 kernel/rcu/tree.c:2046
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2248
 kthread+0x7b9/0x940 kernel/kthread.c:464
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 14427 Comm: syz.7.2699 Not tainted 6.15.0-rc2-syzkaller-00404-g8560697b23dc #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:rep_nop arch/x86/include/asm/vdso/processor.h:13 [inline]
RIP: 0010:cpu_relax arch/x86/include/asm/vdso/processor.h:18 [inline]
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0x1baa/0x2d40 kernel/smp.c:885
Code: b6 04 03 84 c0 75 7e 45 8b 65 00 44 89 e6 83 e6 01 31 ff e8 68 dc 0b 00 41 83 e4 01 4c 8b 64 24 68 75 07 e8 18 d8 0b 00 eb 41 <f3> 90 48 b8 00 00 00 00 00 fc ff df 0f b6 04 03 84 c0 75 11 41 f7
RSP: 0018:ffffc9000c4ff760 EFLAGS: 00000246
RAX: ffffffff81b6e40d RBX: 1ffff110170c823d RCX: 0000000000080000
RDX: ffffc9000f6a4000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000c4ff948 R08: ffffffff81b6e3d8 R09: 1ffffffff20bfc8e
R10: dffffc0000000000 R11: fffffbfff20bfc8f R12: ffff8880b873ad08
R13: ffff8880b86411e8 R14: ffff8880b873ad00 R15: 0000000000000000
FS:  00007facb136b6c0(0000) GS:ffff88812509a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007facb0570c40 CR3: 0000000030e64000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052
 kill_bdev block/bdev.c:90 [inline]
 set_blocksize+0x39b/0x410 block/bdev.c:175
 sb_set_blocksize+0xb5/0x180 block/bdev.c:186
 ext4_load_super fs/ext4/super.c:5112 [inline]
 __ext4_fill_super fs/ext4/super.c:5264 [inline]
 ext4_fill_super+0x21e7/0x67c0 fs/ext4/super.c:5726
 get_tree_bdev_flags+0x492/0x5c0 fs/super.c:1636
 vfs_get_tree+0x92/0x2b0 fs/super.c:1759
 do_new_mount+0x2cf/0xb70 fs/namespace.c:3881
 do_mount fs/namespace.c:4221 [inline]
 __do_sys_mount fs/namespace.c:4432 [inline]
 __se_sys_mount+0x38c/0x400 fs/namespace.c:4409
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7facb058f90a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007facb136ae68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007facb136aef0 RCX: 00007facb058f90a
RDX: 0000200000000040 RSI: 0000200000000080 RDI: 00007facb136aeb0
RBP: 0000200000000040 R08: 00007facb136aef0 R09: 0000000000808080
R10: 0000000000808080 R11: 0000000000000246 R12: 0000200000000080
R13: 00007facb136aeb0 R14: 0000000000000516 R15: 0000200000000000
 </TASK>