syzbot

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (3 ticks this GP) idle=bf44/1/0x4000000000000000 softirq=16213/16213 fqs=0
rcu: 	(detected by 1, t=10502 jiffies, g=13025, q=669 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5950 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:cpumask_test_cpu include/linux/cpumask.h:649 [inline]
RIP: 0010:cpu_online include/linux/cpumask.h:1231 [inline]
RIP: 0010:trace_hrtimer_cancel include/trace/events/timer.h:317 [inline]
RIP: 0010:debug_deactivate+0x44/0x1e0 kernel/time/hrtimer.c:484
Code: 3e e9 02 0f 1f 44 00 00 e8 b9 59 12 00 65 8b 1d 26 72 d1 10 bf 07 00 00 00 89 de e8 e6 5d 12 00 83 fb 07 77 5d e8 9c 59 12 00 <41> 89 de c1 eb 06 48 8d 3c dd 70 2a 82 8f be 08 00 00 00 e8 24 7c
RSP: 0018:ffffc90000007d18 EFLAGS: 00000006
RAX: ffffffff81ae9e24 RBX: 0000000000000000 RCX: ffff888025599e80
RDX: 0000000000010000 RSI: 0000000000000000 RDI: 0000000000000007
RBP: ffffc90000007e90 R08: ffffffff99b899fb R09: 1ffffffff337133f
R10: dffffc0000000000 R11: fffffbfff3371340 R12: ffff88803207f300
R13: dffffc0000000000 R14: 0000002712c90400 R15: ffff8880b86283c0
FS:  000055556c4a0500(0000) GS:ffff888125e1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d1879aaa38 CR3: 0000000072e60000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:1745 [inline]
 __hrtimer_run_queues+0x2b0/0xc30 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x3e0 arch/x86/kernel/apic/apic.c:1062
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:kasan_check_byte include/linux/kasan.h:402 [inline]
RIP: 0010:lock_acquire+0x74/0x340 kernel/locking/lockdep.c:5842
Code: 84 01 00 00 89 c0 48 0f a3 05 18 3c e4 0d 73 0d e8 71 0e 09 00 84 c0 0f 84 cb 01 00 00 83 3d 32 6c e4 0d 00 0f 84 d4 00 00 00 <48> 8b b4 24 90 00 00 00 4c 89 ef e8 5c fe 88 00 83 3d 15 6c e4 0d
RSP: 0018:ffffc9000401fa40 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8bc08340 RDI: ffffffff8bc08300
RBP: ffffffff821933fd R08: 0000000000000001 R09: 0000000000000000
R10: ffffc9000401fca0 R11: fffff52000803f9e R12: 0000000000000000
R13: ffffffff8e062420 R14: 0000000000000000 R15: 0000000000000001
 fs_reclaim_acquire+0x99/0x100 mm/page_alloc.c:4318
 might_alloc include/linux/sched/mm.h:317 [inline]
 slab_pre_alloc_hook mm/slub.c:4904 [inline]
 slab_alloc_node mm/slub.c:5239 [inline]
 __do_kmalloc_node mm/slub.c:5656 [inline]
 __kmalloc_noprof+0x9c/0x800 mm/slub.c:5669
 kmalloc_noprof include/linux/slab.h:961 [inline]
 tomoyo_realpath_from_path+0xe3/0x5d0 security/tomoyo/realpath.c:251
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_number_perm+0x1e8/0x5a0 security/tomoyo/file.c:723
 security_file_ioctl+0xcb/0x2d0 security/security.c:2435
 __do_sys_ioctl fs/ioctl.c:591 [inline]
 __se_sys_ioctl+0x47/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5b8ad8f34b
Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00
RSP: 002b:00007ffeeac52910 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007f5b8ad8f34b
RDX: 00007ffeeac52970 RSI: 0000000000008933 RDI: 0000000000000005
RBP: 00007ffeeac52970 R08: 0000000000000008 R09: 00007ffeeac529a2
R10: 00007ffeeac52da6 R11: 0000000000000246 R12: 00007ffeeac529f0
R13: 00007f5b8ae15189 R14: 00007f5b8bb14620 R15: 00007f5b8ae15189
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g13025 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=6636
rcu: rcu_preempt kthread starved for 10502 jiffies! g13025 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:27480 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x149b/0x4fd0 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6960
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>