rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5804/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=13181, q=608 ncpus=2)
task:udevd           state:R  running task     stack:26920 pid:5804  ppid:5139   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x1553/0x45a0 kernel/sched/core.c:6700
 preempt_schedule_irq+0xbf/0x150 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:xas_start+0x192/0x770 lib/xarray.c:190
Code: 8a 0e f7 85 ed 0f 84 67 02 00 00 e8 88 86 0e f7 e9 7a 02 00 00 4c 89 f0 48 c1 e8 03 48 bd 00 00 00 00 00 fc ff df 80 3c 28 00 <74> 08 4c 89 f7 e8 94 bd 66 f7 4d 8b 26 49 8d 5c 24 48 48 89 d8 48
RSP: 0018:ffffc9000466f570 EFLAGS: 00000246
RAX: 1ffff920008cded4 RBX: 0000000000000003 RCX: ffff88802ba10000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffff88802ba10000 R09: 0000000000000002
R10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000003
R13: ffffc9000466f6b8 R14: ffffc9000466f6a0 R15: 1ffff920008cded7
 xas_load lib/xarray.c:237 [inline]
 xas_find+0x158/0xab0 lib/xarray.c:1250
 find_get_entry mm/filemap.c:2013 [inline]
 find_lock_entries+0x1e9/0xfe0 mm/filemap.c:2114
 shmem_undo_range+0x2b3/0x1b20 mm/shmem.c:1008
 shmem_truncate_range mm/shmem.c:1135 [inline]
 shmem_evict_inode+0x245/0x9e0 mm/shmem.c:1264
 evict+0x4ca/0x8d0 fs/inode.c:705
 __dentry_kill+0x431/0x650 fs/dcache.c:611
 dentry_kill+0xb8/0x290 fs/dcache.c:-1
 dput+0xfe/0x1e0 fs/dcache.c:918
 do_renameat2+0x8f9/0xce0 fs/namei.c:5035
 __do_sys_rename fs/namei.c:5079 [inline]
 __se_sys_rename fs/namei.c:5077 [inline]
 __x64_sys_rename+0x86/0x90 fs/namei.c:5077
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f6056e7acc7
RSP: 002b:00007fff5374d508 EFLAGS: 00000206 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 000055d6bf5a6230 RCX: 00007f6056e7acc7
RDX: 000055d6bf586010 RSI: 00007fff5374d520 RDI: 00007fff5374d920
RBP: 000055d6bf602d30 R08: 00000000000001e0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 00007fff5374d520
R13: 00007fff5374d920 R14: 0000000000000000 R15: 000055d69a4bd9dd
 </TASK>
rcu: rcu_preempt kthread starved for 10543 jiffies! g13181 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:27656 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x1553/0x45a0 kernel/sched/core.c:6700
 schedule+0xbd/0x170 kernel/sched/core.c:6774
 schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x313/0x1590 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x9d/0x3b0 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: 5990 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:check_preemption_disabled+0x60/0x110 lib/smp_processor_id.c:19
Code: 00 48 3b 4c 24 08 0f 85 c4 00 00 00 48 83 c4 10 5b 41 5e 41 5f 5d c3 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 <74> cc 65 4c 8b 3d 66 35 7d 75 41 f6 47 2f 04 74 0a 41 83 bf 10 04
RSP: 0018:ffffc900020bfe08 EFLAGS: 00000046
RAX: 0000000000000001 RBX: ffff88802bdaa8d8 RCX: 0000000080000000
RDX: dffffc0000000000 RSI: ffffffff8acadb60 RDI: ffffffff8b1c8fa0
RBP: ffffc900020bff00 R08: ffffffff8e8b19af R09: 1ffffffff1d16335
R10: dffffc0000000000 R11: fffffbfff1d16336 R12: 0000000000000000
R13: 0000000000000000 R14: 1ffff110057b551b R15: ffff88802bdaa8c0
FS:  000055555c6fe500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2db63fff CR3: 0000000076699000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 lockdep_recursion_finish kernel/locking/lockdep.c:467 [inline]
 lockdep_hardirqs_on_prepare+0x40d/0x770 kernel/locking/lockdep.c:4360
 __exit_to_user_mode kernel/entry/common.c:137 [inline]
 syscall_exit_to_user_mode+0x24/0x50 kernel/entry/common.c:304
 do_syscall_64+0x61/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fbeeec50780
Code: 44 24 20 0f 29 44 24 30 0f 29 44 24 40 48 8b 44 24 08 ff d0 48 83 c4 50 31 c0 5b 5d 41 5c 41 5d 41 5e c3 0f 1f 80 00 00 00 00 <c3> 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 c3 66 66 2e 0f 1f
RSP: 002b:00007ffdb7191cb8 EFLAGS: 00000217
RAX: 0000000000000000 RBX: 00007fbeef015fa0 RCX: 00007fbeeed9cdd9
RDX: 00007ffdb7191cc0 RSI: 00007ffdb7191df0 RDI: 0000000000000011
RBP: 00007fbeeee32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbeef015fac R14: 00007fbeef015fa0 R15: 00007fbeef015fa0
 </TASK>