rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P12260/1:b..l
rcu: (detected by 1, t=10503 jiffies, g=98629, q=130 ncpus=2)
task:syz-executor state:R running task stack:21736 pid:12260 ppid:12241 flags:0x00004002
Call Trace:
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:lock_is_held_type+0x13e/0x190 kernel/locking/lockdep.c:5830
Code: 75 40 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 46 41 f7 c5 00 02 00 00 74 01 fb 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 08 75 3c 89 e8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc90004bbf720 EFLAGS: 00000206
RAX: 82100b120b914a00 RBX: ffff888030541e00 RCX: 82100b120b914a00
RDX: ffff888030541e00 RSI: ffffffff8aaacee0 RDI: ffffffff8afc6a80
RBP: 0000000000000000 R08: ffffea0001b655b7 R09: 1ffffd400036cab6
R10: dffffc0000000000 R11: fffff9400036cab7 R12: 0000000000000002
R13: 0000000000000246 R14: ffff88805f08e8b8 R15: ffff888030542930
lock_is_held include/linux/lockdep.h:288 [inline]
xa_entry include/linux/xarray.h:1216 [inline]
xas_reload+0xf9/0x470 include/linux/xarray.h:1601
find_get_entry mm/filemap.c:2030 [inline]
find_lock_entries+0x395/0xfe0 mm/filemap.c:2114
shmem_undo_range+0x254/0x1a40 mm/shmem.c:1009
shmem_truncate_range mm/shmem.c:1136 [inline]
shmem_evict_inode+0x273/0xa70 mm/shmem.c:1265
evict+0x486/0x870 fs/inode.c:705
do_unlinkat+0x37b/0x570 fs/namei.c:4406
__do_sys_unlink fs/namei.c:4447 [inline]
__se_sys_unlink fs/namei.c:4445 [inline]
__x64_sys_unlink+0x49/0x50 fs/namei.c:4445
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: 0033:0x7fa9b718e577
RSP: 002b:00007ffe6ad79018 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa9b718e577
RDX: 00007ffe6ad79040 RSI: 00007ffe6ad790d0 RDI: 00007ffe6ad790d0
RBP: 00007ffe6ad790d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffe6ad7a160
R13: 00007fa9b7211d7d R14: 00000000000add19 R15: 00007ffe6ad7a1a0
rcu: rcu_preempt kthread starved for 10536 jiffies! g98629 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:27080 pid:17 ppid:2 flags:0x00004000
Call Trace:
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
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: 14603 Comm: syz.1.1974 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:mark_lock+0xd6/0x320 kernel/locking/lockdep.c:4656
Code: eb 24 48 c7 c0 80 f4 ea 96 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 06 02 00 00 83 3d 23 3f 83 15 00 74 36 45 31 ff 49 83 c7 60 <4c> 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 e4 33 75 00
RSP: 0018:ffffc9000c6af860 EFLAGS: 00000082
RAX: 0000000000008c90 RBX: ffff88805db55a00 RCX: ffffffff8167b524
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff90da8510
RBP: 0000000000000008 R08: ffffffff90da8517 R09: 1ffffffff21b50a2
R10: dffffc0000000000 R11: fffffbfff21b50a3 R12: 0000000000000100
R13: dffffc0000000000 R14: ffff88805db564e0 R15: ffffffff907190b0
FS: 00007f053b1f66c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f81cff8 CR3: 000000006afac000 CR4: 00000000003526f0
Call Trace:
mark_usage kernel/locking/lockdep.c:4599 [inline]
__lock_acquire+0xd49/0x7c80 kernel/locking/lockdep.c:5091
lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
_raw_spin_lock_irq+0xa3/0xe0 kernel/locking/spinlock.c:170
spin_lock_irq include/linux/spinlock.h:376 [inline]
__set_current_blocked+0xeb/0x240 kernel/signal.c:3091
set_current_blocked kernel/signal.c:3077 [inline]
signal_delivered kernel/signal.c:2938 [inline]
signal_setup_done+0x189/0x310 kernel/signal.c:2950
handle_signal arch/x86/kernel/signal.c:285 [inline]
arch_do_signal_or_restart+0x4a6/0x7b0 arch/x86/kernel/signal.c:312
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: 0033:0x7f053ce4d9b0
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 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 c3 66 66 2e 0f 1f
RSP: 002b:00007f053b1f5b38 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007f053d1e5fa8 RCX: 00007f053cf8efc9
RDX: 00007f053b1f5b40 RSI: 00007f053b1f5c70 RDI: 0000000000000011
RBP: 00007f053d1e5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f053d1e6038 R14: 00007ffff269db10 R15: 00007ffff269dbf8