syzbot

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P8622/1:b..l
rcu: 	(detected by 1, t=10503 jiffies, g=35373, q=520 ncpus=2)
task:sed             state:R  running task     stack:24232 pid:8622  ppid:8621   flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x14e2/0x4580 kernel/sched/core.c:6700
 preempt_schedule_irq+0xb5/0x140 kernel/sched/core.c:7010
 irqentry_exit+0x67/0x70 kernel/entry/common.c:438
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:mt_validate+0x4d1/0x4530 lib/maple_tree.c:7219
Code: e9 31 f7 48 c7 c7 c0 c6 29 97 be 04 00 00 00 e8 15 8c 8a f7 f0 ff 05 1e 15 d6 0c 49 83 fe ff 0f 85 34 2e 00 00 e8 2f e5 31 f7 <eb> 1d e8 28 e5 31 f7 48 c7 c7 c0 c6 29 97 be 04 00 00 00 e8 e7 8b
RSP: 0018:ffffc900041d74a0 EFLAGS: 00000293
RAX: ffffffff8a53b1b1 RBX: 0000000000000002 RCX: ffff88802abf0000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff9729c6c0
RBP: ffffc900041d7670 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff2e538d8 R12: ffff800020a39000
R13: 0000000000000002 R14: ffffffffffffffff R15: dffffc0000000000
 validate_mm+0xb1/0x420 mm/mmap.c:287
 do_vmi_align_munmap+0x148a/0x1660 mm/mmap.c:2587
 do_vmi_munmap+0x252/0x2d0 mm/mmap.c:2650
 __mmap_region mm/mmap.c:2700 [inline]
 mmap_region+0x720/0x1f80 mm/mmap.c:2931
 do_mmap+0x8d1/0xfd0 mm/mmap.c:1381
 vm_mmap_pgoff+0x1c0/0x400 mm/util.c:556
 ksys_mmap_pgoff+0x520/0x700 mm/mmap.c:1427
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc100bb2242
RSP: 002b:00007fffdf58f748 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fc1008bf000 RCX: 00007fc100bb2242
RDX: 0000000000000003 RSI: 0000000000002000 RDI: 00007fc1008bf000
RBP: 0000000000000812 R08: 0000000000000003 R09: 000000000002c000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007fffdf58f808
R13: 00007fc100b8fab0 R14: 00007fffdf58fbc0 R15: 00000ffffbeb1eec
 </TASK>
rcu: rcu_preempt kthread starved for 10539 jiffies! g35373 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:27368 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x14e2/0x4580 kernel/sched/core.c:6700
 schedule+0xbd/0x170 kernel/sched/core.c:6774
 schedule_timeout+0x160/0x280 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x302/0x1560 kernel/rcu/tree.c:1663
 rcu_gp_kthread+0x99/0x380 kernel/rcu/tree.c:1862
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 8612 Comm: syz.6.579 Not tainted 6.6.93-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:check_preemption_disabled+0x37/0x110 lib/smp_processor_id.c:55
Code: 04 25 28 00 00 00 48 89 44 24 08 65 8b 05 6d 8d 9d 75 65 8b 0d 62 8d 9d 75 f7 c1 ff ff ff 7f 74 1f 65 48 8b 0c 25 28 00 00 00 <48> 3b 4c 24 08 0f 85 c4 00 00 00 48 83 c4 10 5b 41 5e 41 5f 5d c3
RSP: 0018:ffffc90000007748 EFLAGS: 00000006
RAX: 0000000000000000 RBX: a32a44b7d318da53 RCX: 96d8800e96015b00
RDX: 0000000000000002 RSI: ffffffff8aaac440 RDI: ffffffff8afc6780
RBP: ffffc90000007898 R08: ffffffff8e49a76f R09: 1ffffffff1c934ed
R10: dffffc0000000000 R11: fffffbfff1c934ee R12: ffff888023c2a930
R13: dffffc0000000000 R14: ffff888023c2a8d0 R15: 1ffff92000000efc
FS:  00007f5fb43486c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffcc305f80 CR3: 0000000064577000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lockdep_recursion_finish kernel/locking/lockdep.c:467 [inline]
 lock_release+0x538/0x8b0 kernel/locking/lockdep.c:5776
 rcu_lock_release include/linux/rcupdate.h:344 [inline]
 rcu_read_unlock include/linux/rcupdate.h:819 [inline]
 is_bpf_text_address+0x28f/0x2a0 kernel/bpf/core.c:743
 kernel_text_address+0xa0/0xd0 kernel/extable.c:125
 __kernel_text_address+0xd/0x30 kernel/extable.c:79
 unwind_get_return_address+0x5d/0xc0 arch/x86/kernel/unwind_orc.c:369
 arch_stack_walk+0x11d/0x190 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:328
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767
 slab_alloc_node mm/slub.c:3485 [inline]
 slab_alloc mm/slub.c:3493 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3500 [inline]
 kmem_cache_alloc+0x11e/0x2e0 mm/slub.c:3509
 __sigqueue_alloc+0x40c/0x520 kernel/signal.c:438
 __send_signal_locked+0x22f/0xe00 kernel/signal.c:1130
 do_send_sig_info kernel/signal.c:1312 [inline]
 group_send_sig_info+0x1fa/0x260 kernel/signal.c:1462
 do_bpf_send_signal+0x7f/0x190 kernel/trace/bpf_trace.c:836
 irq_work_single+0xd5/0x230 kernel/irq_work.c:221
 irq_work_run_list kernel/irq_work.c:252 [inline]
 irq_work_run+0x156/0x2e0 kernel/irq_work.c:261
 __sysvec_irq_work+0x98/0x380 arch/x86/kernel/irq_work.c:22
 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
 sysvec_irq_work+0x9c/0xc0 arch/x86/kernel/irq_work.c:17
 </IRQ>
 <TASK>
 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:723
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:27 [inline]
RIP: 0010:static_key_false include/linux/jump_label.h:207 [inline]
RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:147 [inline]
RIP: 0010:wrmsr arch/x86/include/asm/msr.h:254 [inline]
RIP: 0010:native_apic_msr_write+0x39/0x50 arch/x86/include/asm/apic.h:196
Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 c3 f3 0f 1e fa 89 f6 31 d2 e9 f7 68 19 03 0f 1f 80 00 00 00
RSP: 0018:ffffc90004337cd8 EFLAGS: 00000246
RAX: 00000000000000f6 RBX: 0000000000000200 RCX: 000000000000083f
RDX: 0000000000000000 RSI: 00000000000000f6 RDI: 000000000000083f
RBP: 0000000000000000 R08: ffffc90004337c47 R09: 1ffff92000866f88
R10: dffffc0000000000 R11: fffff52000866f89 R12: ffff8880b8e35201
R13: dffffc0000000000 R14: ffff8880b8e35290 R15: 0000000000000020
 __apic_send_IPI_self arch/x86/include/asm/apic.h:454 [inline]
 arch_irq_work_raise+0x68/0x70 arch/x86/kernel/irq_work.c:31
 irq_work_queue+0x99/0x140 kernel/irq_work.c:124
 bpf_send_signal_common+0x2b6/0x420 kernel/trace/bpf_trace.c:875
 ____bpf_send_signal kernel/trace/bpf_trace.c:884 [inline]
 bpf_send_signal+0x19/0x20 kernel/trace/bpf_trace.c:882
 bpf_prog_7ba5217f62dcd359+0x40/0x44
 bpf_dispatcher_nop_func include/linux/bpf.h:1213 [inline]
 __bpf_prog_run include/linux/filter.h:612 [inline]
 bpf_prog_run include/linux/filter.h:619 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2322 [inline]
 bpf_trace_run2+0x1d1/0x3c0 kernel/trace/bpf_trace.c:2361
 trace_sys_enter+0x69/0x80 include/trace/events/syscalls.h:18
 syscall_trace_enter+0xf0/0x150 kernel/entry/common.c:81
 do_syscall_64+0x28/0xb0 arch/x86/entry/common.c:77
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f5fb352ab19
Code: 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 04 25
RSP: 002b:00007f5fb4347b40 EFLAGS: 00000246 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007f5fb37b6088 RCX: 00007f5fb352ab19
RDX: 00007f5fb4347b40 RSI: 00007f5fb4347c70 RDI: 0000000000000011
RBP: 00007f5fb37b6080 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5fb37b608c
R13: 0000000000000000 R14: 00007fffcc306410 R15: 00007fffcc3064f8
 </TASK>