rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6437/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=15049, q=489 ncpus=2)
task:sed             state:R  running task     stack:24232 pid:6437  ppid:6436   flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5380 [inline]
 __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
 preempt_schedule_irq+0xb5/0x140 kernel/sched/core.c:7009
 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_nulls lib/maple_tree.c:7173 [inline]
RIP: 0010:mt_validate+0x3d9f/0x4530 lib/maple_tree.c:7235
Code: 84 24 e8 00 00 00 ff ff ff ff 48 8d 7b 30 ba 10 00 00 00 31 f6 e8 51 52 80 f7 48 89 df e8 b9 d7 fe ff 48 8b 9c 24 d8 00 00 00 <48> 89 df 48 c7 c6 d0 7f 32 8e e8 a2 f9 28 f7 48 83 fb 09 74 10 48
RSP: 0018:ffffc900033c77c0 EFLAGS: 00000286
RAX: 0000000000000000 RBX: ffff88807736c41c RCX: ffff8880239a8000
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000002
RBP: ffffc900033c7990 R08: ffffc900033c78bf R09: 0000000000000000
R10: ffffc900033c78b0 R11: fffff52000678f18 R12: 0000000000000000
R13: ffffc900033c78e0 R14: ffff88807736c400 R15: dffffc0000000000
 validate_mm+0xb1/0x420 mm/mmap.c:288
 mmap_region+0xeaa/0x2020 mm/mmap.c:2947
 do_mmap+0x92f/0x10a0 mm/mmap.c:1385
 vm_mmap_pgoff+0x1c0/0x400 mm/util.c:556
 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: 0033:0x7f925e3fb242
RSP: 002b:00007ffee83155b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f925e0d9000 RCX: 00007f925e3fb242
RDX: 0000000000000003 RSI: 0000000000000088 RDI: 00007f925e0d9000
RBP: 0000000000000032 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000000032 R11: 0000000000000206 R12: 00007ffee8315678
R13: 00007f925e0da0c0 R14: 00007ffee83159f0 R15: 00007f925e0d9000
 </TASK>
rcu: rcu_preempt kthread starved for 10533 jiffies! g15049 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:27752 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5380 [inline]
 __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
 schedule+0xbd/0x170 kernel/sched/core.c:6773
 schedule_timeout+0x160/0x280 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x302/0x1560 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x99/0x380 kernel/rcu/tree.c:1866
 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 6439 Comm: syz.1.124 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:posixtimer_rearm+0x18f/0x340 kernel/time/posix-timers.c:271
Code: 74 08 4c 89 e7 e8 41 94 65 00 49 8b 6e 78 4d 8d ae 80 00 00 00 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 08 4c 89 ef e8 b7 94 65 00 49 89 6d 00 49 c7 04 24 ff ff ff ff
RSP: 0018:ffffc90004b6fbe0 EFLAGS: 00000046
RAX: 1ffff1100f92fdb7 RBX: ffffc90004b6fe00 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88807c97eda8
RBP: 0000000000000001 R08: ffff8880b8f2b703 R09: 1ffff110171e56e0
R10: dffffc0000000000 R11: ffffed10171e56e1 R12: ffff88807c97edb0
R13: ffff88807c97edb8 R14: ffff88807c97ed38 R15: 1ffff1100f92fdb8
FS:  00007fded2dae6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 000000002b49f000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 dequeue_signal+0x1ba/0x4b0 kernel/signal.c:706
 get_signal+0x551/0x1400 kernel/signal.c:2782
 arch_do_signal_or_restart+0x9c/0x7b0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xf6/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fded1f8f6c7
Code: ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89
RSP: 002b:00007fded2dae0e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007fded21e5fa8 RCX: 00007fded1f8f6c9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fded21e5fa8
RBP: 00007fded21e5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fded21e6038 R14: 00007ffc53d4f120 R15: 00007ffc53d4f208
 </TASK>