rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P11646/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=75185, q=245 ncpus=2)
task:syz-executor.2  state:R  running task     stack:23800 pid:11646 tgid:11645 ppid:8609   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5192 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6529
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6851
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:rcu_is_watching+0x67/0xb0 kernel/rcu/tree.c:719
Code: 89 f7 e8 1c e8 7f 00 48 c7 c3 08 7d 03 00 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 84 c0 75 22 8b 03 65 ff 0d 41 67 8a 7e <74> 10 83 e0 04 c1 e8 02 5b 41 5e 41 5f c3 cc cc cc cc e8 22 48 87
RSP: 0018:ffffc9000a4977e0 EFLAGS: 00000286
RAX: 00000000001cb7bc RBX: ffff8880b9437d08 RCX: ffff88802534da00
RDX: ffff88802534da00 RSI: ffffffff8c200740 RDI: ffffffff8c200700
RBP: ffffc9000a497910 R08: ffffffff81de9b32 R09: 1ffff11005ca1630
R10: dffffc0000000000 R11: ffffed1005ca1631 R12: ffff8880684f71f0
R13: dffffc0000000000 R14: ffffffff8ddc9a20 R15: dffffc0000000000
 rcu_read_unlock include/linux/rcupdate.h:867 [inline]
 pte_unmap include/linux/pgtable.h:115 [inline]
 follow_page_pte+0x2af/0x1d90 mm/gup.c:1055
 follow_pmd_mask mm/gup.c:1089 [inline]
 follow_pud_mask mm/gup.c:1144 [inline]
 follow_p4d_mask mm/gup.c:1165 [inline]
 follow_page_mask+0x766/0x2e00 mm/gup.c:1211
 __get_user_pages+0x67e/0x1590 mm/gup.c:1636
 populate_vma_page_range+0x264/0x330 mm/gup.c:2078
 __mm_populate+0x27a/0x460 mm/gup.c:2181
 mm_populate include/linux/mm.h:3442 [inline]
 vm_mmap_pgoff+0x2c3/0x3d0 mm/util.c:578
 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: 0033:0x7f2f4c67cea9
RSP: 002b:00007f2f4d47e0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f2f4c7b3f80 RCX: 00007f2f4c67cea9
RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000000020000000
RBP: 00007f2f4c6ebff4 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f2f4c7b3f80 R15: 00007ffeb413c758
 </TASK>
rcu: rcu_preempt kthread starved for 10532 jiffies! g75185 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:26448 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5192 [inline]
 __schedule+0x17e8/0x4a20 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:2029
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2231
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </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 PID: 11634 Comm: syz-executor.4 Not tainted 6.10.0-rc3-next-20240611-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:55 [inline]
RIP: 0010:__unwind_start+0x598/0x7c0 arch/x86/kernel/unwind_orc.c:758
Code: 4c 89 f8 48 c1 e8 03 48 89 04 24 4c 89 e8 48 c1 e8 03 48 89 44 24 08 4c 89 64 24 28 48 b8 00 00 00 00 00 fc ff df 48 8b 0c 24 <80> 3c 01 00 74 08 4c 89 ff e8 6a 41 b8 00 49 8b 1f 48 b8 00 00 00
RSP: 0018:ffffc9000b0e7678 EFLAGS: 00000093
RAX: dffffc0000000000 RBX: ffffc9000b0e76e0 RCX: 1ffff9200161cedd
RDX: 0000000000000000 RSI: 0000000080000001 RDI: 0000000000000000
RBP: 1ffff9200161cedc R08: ffffffff8140fe65 R09: ffffffff8140f95f
R10: 0000000000000003 R11: ffff888023173c00 R12: ffffc9000b0e7778
R13: ffffc9000b0e76f0 R14: ffffc9000b0e76e0 R15: ffffc9000b0e76e8
FS:  0000555585117480(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30c21000 CR3: 0000000022c00000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0x103/0x1b0 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240
 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2214 [inline]
 slab_free mm/slub.c:4455 [inline]
 kmem_cache_free+0x145/0x350 mm/slub.c:4530
 __sigqueue_free kernel/signal.c:451 [inline]
 collect_signal kernel/signal.c:594 [inline]
 __dequeue_signal+0x4ac/0x5c0 kernel/signal.c:616
 dequeue_signal+0x169/0x5a0 kernel/signal.c:639
 get_signal+0x602/0x1740 kernel/signal.c:2788
 arch_do_signal_or_restart+0x96/0x830 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f27b4a7cea9
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:00007ffc67f608e8 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 00000000000000d0 RCX: 00007f27b4a7cea9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f27b4bb4058
RBP: 0000000000000bdf R08: 0000000000000003 R09: 0000000800000000
R10: 00007f27b4a00000 R11: 0000000000000246 R12: 00007f27b4bb4050
R13: 00007f27b4bb405c R14: 0000000000000001 R15: 00007f27b4bb3f80
 </TASK>