rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5988/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=18801, q=805 ncpus=2)
task:syz-executor state:R running task stack:21032 pid:5988 tgid:5988 ppid:5978 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x1539/0x5110 kernel/sched/core.c:6907
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7234
irqentry_exit+0x599/0x620 kernel/entry/common.c:239
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216
Code: 8b 3d 44 93 54 0c 48 89 de 5b e9 03 1f 5e 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0d 68 43 55 11 65 8b 15 89 43 55 11 81 e2 00 01 ff 00 74
RSP: 0018:ffffc90003f8f5c0 EFLAGS: 00000246
RAX: ffffffff82004561 RBX: ffffea0001a9e300 RCX: ffff888027245a00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: dffffc0000000000 R08: ffffea0001a9e337 R09: 1ffffd4000353c66
R10: dffffc0000000000 R11: fffff94000353c67 R12: 0000000000000000
R13: 1ffff920007f1ed4 R14: ffffc90003f8f6a0 R15: ffff888149427180
xas_reload+0x281/0x460 include/linux/xarray.h:1632
find_get_entry mm/filemap.c:2079 [inline]
find_lock_entries+0x278/0xa90 mm/filemap.c:2166
shmem_undo_range+0x2d6/0x1660 mm/shmem.c:1132
shmem_truncate_range mm/shmem.c:1278 [inline]
shmem_evict_inode+0x240/0x9e0 mm/shmem.c:1408
evict+0x61e/0xb10 fs/inode.c:846
filename_unlinkat+0x43f/0x610 fs/namei.c:5544
__do_sys_unlink fs/namei.c:5575 [inline]
__se_sys_unlink+0x2e/0x140 fs/namei.c:5572
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc508199fa7
RSP: 002b:00007ffe50fe5118 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc508199fa7
RDX: 00007ffe50fe5140 RSI: 00007ffe50fe51d0 RDI: 00007ffe50fe51d0
RBP: 00007ffe50fe51d0 R08: 00007ffe50fe61d0 R09: 00000000ffffffff
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffe50fe6260
R13: 00007fc50820471f R14: 000000000002958d R15: 00007ffe50fe62a0
rcu: rcu_preempt kthread starved for 10436 jiffies! g18801 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:27664 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x1539/0x5110 kernel/sched/core.c:6907
__schedule_loop kernel/sched/core.c:6989 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7004
schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 7109 Comm: syz.0.243 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:rcu_read_lock_held_common kernel/rcu/update.c:105 [inline]
RIP: 0010:rcu_read_lock_sched_held+0x5/0x70 kernel/rcu/update.c:124
Code: cc cc e8 2e f4 02 0a 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 53 a6 fa 02 0a 85 c0 74 29 31 db e8 bb ea 00 00 84 c0 74 23 e8 02
RSP: 0018:ffffc9000c3276f0 EFLAGS: 00000002
RAX: 0000000000000001 RBX: 1ffffffff1c344f3 RCX: ffff888029433c80
RDX: 0000000000000000 RSI: ffffffff8e15a2f5 RDI: ffffffff8c276e00
RBP: dffffc0000000000 R08: ffffffff90110bb7 R09: 1ffffffff2022176
R10: dffffc0000000000 R11: fffffbfff2022177 R12: ffff888029433c80
R13: ffff888079176000 R14: 0000000000000001 R15: ffffffff8e1a2798
FS: 00007f810d5f46c0(0000) GS:ffff888125572000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 0000000069b80000 CR4: 00000000003526f0
Call Trace:
task_css include/linux/cgroup.h:460 [inline]
task_ca kernel/sched/cpuacct.c:41 [inline]
cpuacct_charge+0x117/0x320 kernel/sched/cpuacct.c:343
cgroup_account_cputime include/linux/cgroup.h:742 [inline]
update_se+0x2b5/0x620 kernel/sched/fair.c:1199
update_curr_rt kernel/sched/rt.c:982 [inline]
dequeue_task_rt+0x79/0x9d0 kernel/sched/rt.c:1454
block_task kernel/sched/core.c:2170 [inline]
try_to_block_task kernel/sched/core.c:6530 [inline]
__schedule+0x676/0x5110 kernel/sched/core.c:6842
__schedule_loop kernel/sched/core.c:6989 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7004
futex_do_wait kernel/futex/waitwake.c:358 [inline]
__futex_wait+0x1ee/0x420 kernel/futex/waitwake.c:687
futex_wait+0x119/0x380 kernel/futex/waitwake.c:715
do_futex+0x333/0x420 kernel/futex/syscalls.c:130
__do_sys_futex kernel/futex/syscalls.c:207 [inline]
__se_sys_futex+0x3a8/0x450 kernel/futex/syscalls.c:188
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f810c79aeb9
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:00007f810d5f40e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f810ca15fa8 RCX: 00007f810c79aeb9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f810ca15fa8
RBP: 00007f810ca15fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f810ca16038 R14: 00007ffcdcdd7ec0 R15: 00007ffcdcdd7fa8