rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6173/1:b..l
	(detected by 1, t=10503 jiffies, g=30465, q=301 ncpus=2)
task:udevd           state:R  running task     stack:24432 pid:6173  ppid:3638   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6874
 irqentry_exit+0x63/0x70 kernel/entry/common.c:439
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:85 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x84/0x290 mm/kasan/generic.c:189
Code: 49 c1 e9 03 4b 8d 1c 21 49 89 df 4d 29 df 49 83 ff 10 7f 29 4d 85 ff 0f 84 38 01 00 00 4c 89 cb 48 f7 d3 4c 01 f3 41 80 3b 00 <0f> 85 86 01 00 00 49 ff c3 48 ff c3 75 ee e9 18 01 00 00 44 89 dd
RSP: 0018:ffffc90004ef7710 EFLAGS: 00000202
RAX: ffffffff8a184601 RBX: ffffffffffffffff RCX: ffffffff8a1846b8
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff9704c800
RBP: ffffc90004ef78f0 R08: ffffffff9704c803 R09: 1ffffffff2e09900
R10: dffffc0000000000 R11: fffffbfff2e09900 R12: dffffc0000000001
R13: ffff88807bcb5a80 R14: 1ffffffff2e09900 R15: 0000000000000001
 instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
 atomic_inc include/linux/atomic/atomic-instrumented.h:190 [inline]
 mt_validate_nulls lib/maple_tree.c:7198 [inline]
 mt_validate+0x4428/0x4cb0 lib/maple_tree.c:7249
 validate_mm_mt+0xe2/0x440 mm/mmap.c:295
 validate_mm+0xe1/0x2e0 mm/mmap.c:332
 do_mas_align_munmap+0x1015/0x12b0 mm/mmap.c:2599
 do_mas_munmap+0x240/0x2b0 mm/mmap.c:2650
 __vm_munmap+0x1ac/0x2d0 mm/mmap.c:2936
 __do_sys_munmap mm/mmap.c:2961 [inline]
 __se_sys_munmap mm/mmap.c:2958 [inline]
 __x64_sys_munmap+0x5c/0x70 mm/mmap.c:2958
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3cc671e097
RSP: 002b:00007ffe678aaff8 EFLAGS: 00000246 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffda RBX: 0000559742ea9f40 RCX: 00007f3cc671e097
RDX: 0000559742eb4aa8 RSI: 0000000000000200 RDI: 00007f3cc6d8f000
RBP: 0000000000000001 R08: 0000559742eb0ec0 R09: 0000559742eacfa0
R10: 0000000000000010 R11: 0000000000000246 R12: 0000559742ea60b0
R13: 00007f3cc6e5539c R14: 0000000000000200 R15: 0000000000000009
 </TASK>
rcu: rcu_preempt kthread starved for 10491 jiffies! g30465 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:27736 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:6731
 preempt_schedule+0xbc/0xd0 kernel/sched/core.c:6755
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock_irqrestore+0x10d/0x120 kernel/locking/spinlock.c:194
 __try_to_del_timer_sync+0x193/0x1f0 kernel/time/timer.c:1422
 __timer_delete_sync+0x21f/0x2e0 kernel/time/timer.c:1574
 timer_delete_sync kernel/time/timer.c:1629 [inline]
 del_timer_sync include/linux/timer.h:200 [inline]
 schedule_timeout+0x18e/0x2d0 kernel/time/timer.c:2169
 rcu_gp_fqs_loop+0x303/0x1340 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x99/0x3b0 kernel/rcu/tree.c:1905
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </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: 7716 Comm: syz.6.762 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__lock_acquire+0x101f/0x7d10 kernel/locking/lockdep.c:-1
Code: ee 20 89 f0 c1 c0 04 41 29 f4 44 31 e0 44 01 ee 41 29 c5 89 c1 c1 c1 06 44 31 e9 01 f0 89 ca c1 c2 08 29 ce 31 f2 01 c1 29 d0 <41> 89 d6 41 c1 c6 10 41 31 c6 01 ca 44 89 f3 c1 c3 13 44 29 f1 31
RSP: 0018:ffffc9000511f620 EFLAGS: 00000017
RAX: 000000005744a30f RBX: 00000000000208c2 RCX: 00000000922ae3f6
RDX: 00000000d4fbf1b7 RSI: 000000003eb4c1d2 RDI: ffffffff90ad8248
RBP: ffffc9000511f870 R08: dffffc0000000000 R09: 1ffffffff215b049
R10: dffffc0000000000 R11: fffffbfff215b04a R12: 00000000708d711c
R13: 000000008d8abe11 R14: ffff88802be86420 R15: ffff88802be86468
FS:  00007f03b8c2c6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fba0f3456b8 CR3: 000000007ac7a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662
 seqcount_lockdep_reader_access+0xcd/0x1d0 include/linux/seqlock.h:102
 ktime_get_with_offset+0x90/0x320 kernel/time/timekeeping.c:889
 common_hrtimer_rearm+0x5d/0x110 kernel/time/posix-timers.c:303
 posixtimer_rearm+0x131/0x340 kernel/time/posix-timers.c:329
 dequeue_signal+0x1b6/0x4b0 kernel/signal.c:704
 get_signal+0x547/0x1350 kernel/signal.c:2751
 arch_do_signal_or_restart+0xc4/0x1350 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f03b7d9acb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f03b8c2c0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f03b8016188 RCX: 00007f03b7d9acb9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f03b8016188
RBP: 00007f03b8016180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f03b8016218 R14: 00007ffe52ff34e0 R15: 00007ffe52ff35c8
 </TASK>