rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P10383/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=232373, q=525 ncpus=2)
task:syz.4.10030     state:R  running task     stack:27264 pid:10383 tgid:10383 ppid:7625   task_flags:0x40004c flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x14ef/0x4fb0 kernel/sched/core.c:6863
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7190
 irqentry_exit+0x597/0x620 kernel/entry/common.c:216
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:rcu_lock_release include/linux/rcupdate.h:341 [inline]
RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:897 [inline]
RIP: 0010:is_bpf_text_address+0x288/0x2b0 kernel/bpf/core.c:746
Code: c2 a0 d0 93 8b e8 78 94 cd ff 48 85 db 0f 95 c0 48 81 fb 20 02 00 00 40 0f 95 c5 40 20 c5 48 c7 c7 20 a3 35 8e 48 8b 74 24 08 <e8> 03 7b cd ff e8 9e 22 d7 ff 89 e8 48 83 c4 10 5b 41 5c 41 5d 41
RSP: 0018:ffffc900000f7850 EFLAGS: 00000246
RAX: ffffffff81d1cf00 RBX: 0000000000000000 RCX: ffff888061455b80
RDX: 0000000000000000 RSI: ffffffff81d1cd26 RDI: ffffffff8e35a320
RBP: 0000000000000000 R08: ffffffff81d1cd26 R09: ffffffff8e35a320
R10: ffffc900000f7938 R11: ffffffff81ae4560 R12: 00000000000028da
R13: dffffc0000000000 R14: 00007faa0279acb9 R15: 0000000000000000
 kernel_text_address+0xa5/0xe0 kernel/extable.c:125
 __kernel_text_address+0xd/0x30 kernel/extable.c:79
 unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:385
 arch_stack_walk+0xfb/0x150 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2540 [inline]
 slab_free mm/slub.c:6670 [inline]
 kfree+0x1be/0x650 mm/slub.c:6878
 __free_fdtable fs/file.c:106 [inline]
 put_files_struct+0x2dc/0x350 fs/file.c:513
 do_exit+0x655/0x2310 kernel/exit.c:966
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1112
 __do_sys_exit_group kernel/exit.c:1123 [inline]
 __se_sys_exit_group kernel/exit.c:1121 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1121
 x64_sys_call+0x2210/0x2210 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7faa0279acb9
RSP: 002b:00007ffc06213328 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007faa0279acb9
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffc0621338c R08: 0000000000000000 R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000093
R13: 00000000000927c0 R14: 0000000000142da5 R15: 00007ffc062133e0
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10496 jiffies! g232373 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=101493
rcu: rcu_preempt kthread starved for 10497 jiffies! g232373 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27504 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x14ef/0x4fb0 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:6960
 schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x312/0x1560 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x9d/0x3b0 kernel/rcu/tree.c:2285
 kthread+0x726/0x8b0 kernel/kthread.c:463
 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5198 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:num_possible_cpus include/linux/cpumask.h:1222 [inline]
RIP: 0010:mm_get_cid+0xab/0x130 kernel/sched/sched.h:3759
Code: 41 5c 41 5d 41 5e 41 5f 5d e9 01 eb e7 09 cc 49 c7 c5 c8 14 d8 8d 49 c1 ed 03 bd 00 00 00 80 eb 07 44 89 f0 f7 d8 71 d4 f3 90 <43> 0f b6 44 25 00 84 c0 75 41 44 8b 3d bc 9e 44 0c 48 89 df 4c 89
RSP: 0018:ffffc90002ff7a68 EFLAGS: 00000887
RAX: 0000000080000000 RBX: ffff88802607bc90 RCX: dffffc0000000000
RDX: 0000000000000002 RSI: 0000000000000002 RDI: ffff88802607bc90
RBP: 0000000080000000 R08: ffff88802607bb13 R09: 1ffff11004c0f762
R10: dffffc0000000000 R11: ffffed1004c0f763 R12: dffffc0000000000
R13: 1ffffffff1bb0299 R14: 0000000080000000 R15: 0000000000000002
FS:  00007fd09b00b880(0000) GS:ffff888125a29000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000061030 CR3: 0000000053c5a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 mm_cid_from_cpu kernel/sched/sched.h:3820 [inline]
 mm_cid_schedin kernel/sched/sched.h:3870 [inline]
 mm_cid_switch_to kernel/sched/sched.h:3886 [inline]
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x21ae/0x4fb0 kernel/sched/core.c:6863
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7190
 irqentry_exit+0x597/0x620 kernel/entry/common.c:216
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x221/0x330 kernel/locking/lockdep.c:5872
Code: ff ff ff e8 51 63 d9 09 f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 3b 54 30 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 88 ff 32
RSP: 0018:ffffc90002ff7dd8 EFLAGS: 00000286
RAX: fee769a431f46c00 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 0000000007f52300 RSI: ffffffff8dd3d23d RDI: ffffffff8be73880
RBP: ffffffff821b805c R08: ffffffff821b805c R09: ffffffff8e490ba0
R10: dffffc0000000000 R11: fffffbfff1f9daef R12: 0000000000000000
R13: ffffffff8e490ba0 R14: 0000000000000001 R15: 0000000000000246
 fs_reclaim_acquire+0x98/0x100 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]
 kmem_cache_alloc_noprof+0x45/0x6e0 mm/slub.c:5270
 getname_flags+0xb7/0x540 fs/namei.c:146
 getname include/linux/fs.h:2498 [inline]
 __do_sys_unlink fs/namei.c:5483 [inline]
 __se_sys_unlink fs/namei.c:5481 [inline]
 __x64_sys_unlink+0x3a/0x50 fs/namei.c:5481
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd09a915937
Code: Unable to access opcode bytes at 0x7fd09a91590d.
RSP: 002b:00007ffcca97b2b8 EFLAGS: 00000202 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000bb8 RCX: 00007fd09a915937
RDX: 0000000000000000 RSI: 000000004ecc1e80 RDI: 0000562d1eb2402e
RBP: 0000000000000000 R08: 000000004ed5463d R09: 3fffffffffffffff
R10: 4000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000562d1eb3f100 R14: 0000000000000001 R15: 0000000000000000
 </TASK>