rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4267/1:b..l
(detected by 1, t=10502 jiffies, g=18769, q=505 ncpus=2)
task:syz-executor state:R running task stack:22080 pid:4267 ppid:4263 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6873
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:folio_contains+0xe/0x580 include/linux/pagemap.h:734
Code: 94 c0 40 08 e8 74 0a e8 d0 7d d6 ff e9 e1 fe ff ff e8 c6 7d d6 ff e9 30 ff ff ff 90 55 41 57 41 56 41 55 41 54 53 50 49 89 f6 <48> 89 fb 49 bc 00 00 00 00 00 fc ff df e8 a0 7d d6 ff 48 89 df e8
RSP: 0018:ffffc90004147660 EFLAGS: 00000246
RAX: 0000000000008000 RBX: 0000000000000000 RCX: ffff88802fd25940
RDX: 0000000000000000 RSI: 0000000000000f49 RDI: ffffea00011c9740
RBP: ffffc900041477d0 R08: dffffc0000000000 R09: fffff940002392e9
R10: fffff940002392e9 R11: 1ffffd40002392e8 R12: 1ffffd40002392ee
R13: ffffea00011c9774 R14: 0000000000000f49 R15: ffffea00011c9740
find_lock_entries+0x5db/0xb90 mm/filemap.c:2134
shmem_undo_range+0x227/0x2050 mm/shmem.c:925
shmem_truncate_range mm/shmem.c:1062 [inline]
shmem_evict_inode+0x248/0xa40 mm/shmem.c:1171
evict+0x485/0x870 fs/inode.c:705
__dentry_kill+0x431/0x650 fs/dcache.c:611
dentry_kill+0xb8/0x290 fs/dcache.c:-1
dput+0xfa/0x1d0 fs/dcache.c:918
__fput+0x5e0/0x920 fs/file_table.c:328
task_work_run+0x1ca/0x250 kernel/task_work.c:203
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
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:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f9cbb590a77
RSP: 002b:00007ffd9afcffd8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f9cbb613d7d RCX: 00007f9cbb590a77
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd9afd0090
RBP: 00007ffd9afd0090 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffd9afd1120
R13: 00007f9cbb613d7d R14: 0000000000027758 R15: 00007ffd9afd1160
rcu: rcu_preempt kthread starved for 10536 jiffies! g18769 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:27840 pid:16 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
schedule+0xb9/0x180 kernel/sched/core.c:6637
schedule_timeout+0x15c/0x280 kernel/time/timer.c:2168
rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706
rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
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: 5400 Comm: syz.2.190 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:memset_erms+0xb/0x10 arch/x86/lib/memset_64.S:65
Code: 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 f3 aa <4c> 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01 01 01
RSP: 0018:ffffc9000341fa98 EFLAGS: 00000202
RAX: ffffc9000341fb00 RBX: ffff8880792fd940 RCX: 0000000000000000
RDX: 0000000000000020 RSI: 0000000000000000 RDI: ffffc9000341fb90
RBP: ffffc9000341fc90 R08: dffffc0000000000 R09: ffffc9000341fb70
R10: fffff52000683f72 R11: 1ffff92000683f6e R12: dffffc0000000000
R13: ffff8880792ff250 R14: 00007fff148047c0 R15: 00007fff148047c0
FS: 00005555629c4500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9f1e5b1d58 CR3: 0000000056203000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
save_xstate_epilog arch/x86/kernel/fpu/signal.c:121 [inline]
copy_fpstate_to_sigframe+0x935/0xcb0 arch/x86/kernel/fpu/signal.c:245
get_sigframe arch/x86/kernel/signal.c:297 [inline]
__setup_rt_frame arch/x86/kernel/signal.c:472 [inline]
setup_rt_frame arch/x86/kernel/signal.c:784 [inline]
handle_signal arch/x86/kernel/signal.c:828 [inline]
arch_do_signal_or_restart+0x622/0x1240 arch/x86/kernel/signal.c:873
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:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f9f1d66f090
Code: 38 44 89 68 fc 8b 43 28 48 83 c4 38 5b 5d 41 5c 41 5d 41 5e 41 5f c3 0f 1f 00 c6 44 24 1e 01 48 89 ee 44 89 e7 4c 89 44 24 10 <4c> 89 54 24 08 e8 66 e6 fd ff 4c 8b 54 24 08 4c 8b 44 24 10 84 c0
RSP: 002b:00007fff14804ba0 EFLAGS: 00000246
RAX: 00000000000057c5 RBX: 00007f9f1e515720 RCX: 0000000000005d41
RDX: ffffffff8a035f0b RSI: ffffffff8a035115 RDI: 0000000000000012
RBP: ffffffff8a035115 R08: 00007f9f1d9e6038 R09: 00007f9f1d9d2000
R10: 00007f9f1d1ff008 R11: 0000000000000012 R12: 0000000000000012
R13: 0000000000000000 R14: ffffffff8a035f0b R15: 0000000000005d41