rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5214/1:b..l
(detected by 0, t=10503 jiffies, g=13845, q=312)
task:syz-executor state:R running task stack:21856 pid: 5214 ppid: 5197 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11bb/0x4390 kernel/sched/core.c:6395
preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6799
irqentry_exit+0x63/0x70 kernel/entry/common.c:432
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:rcu_lock_acquire+0x0/0x30 include/linux/rcupdate.h:312
Code: 89 d3 49 89 f6 49 89 ff e8 5d 53 f3 ff 4c 89 ff 4c 89 f6 48 89 da 5b 41 5e 41 5f e9 4a fc fc ff 66 2e 0f 1f 84 00 00 00 00 00 3b 53 f3 ff e8 36 53 f3 ff 48 c7 c7 20 c7 11 8c 31 f6 31 d2 b9
RSP: 0018:ffffc9000341f2f8 EFLAGS: 00000283
RAX: 0000000000000001 RBX: 00007fecdf9e9cf7 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff8a59e7e0 RDI: 00007fecdf9e9cf7
RBP: 0000000000068c01 R08: 0000000000000004 R09: 000000000000000a
R10: fffff52000683e7d R11: 1ffff92000683e7b R12: ffff888026cb5940
R13: 1ffff92000683e9c R14: 00007fecdf9e9cf7 R15: 1ffff92000683e7a
rcu_read_lock include/linux/rcupdate.h:740 [inline]
is_bpf_text_address+0x1d/0x270 kernel/bpf/core.c:725
kernel_text_address kernel/extable.c:151 [inline]
__kernel_text_address+0x9a/0x100 kernel/extable.c:105
unwind_get_return_address+0x49/0x80 arch/x86/kernel/unwind_orc.c:323
arch_stack_walk+0xf2/0x140 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0x98/0xe0 kernel/stacktrace.c:122
save_stack+0xf3/0x1e0 mm/page_owner.c:119
__reset_page_owner+0x51/0x180 mm/page_owner.c:140
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1340 [inline]
free_pcp_prepare mm/page_alloc.c:1391 [inline]
free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317
free_unref_page_list+0x122/0x7e0 mm/page_alloc.c:3433
release_pages+0x184b/0x1bb0 mm/swap.c:963
__pagevec_release+0x6d/0xe0 mm/swap.c:983
pagevec_release include/linux/pagevec.h:81 [inline]
shmem_undo_range+0x5cb/0x1880 mm/shmem.c:964
shmem_truncate_range mm/shmem.c:1063 [inline]
shmem_evict_inode+0x20d/0xa00 mm/shmem.c:1145
evict+0x485/0x870 fs/inode.c:647
do_unlinkat+0x3d8/0x6f0 fs/namei.c:4363
__do_sys_unlink fs/namei.c:4404 [inline]
__se_sys_unlink fs/namei.c:4402 [inline]
__x64_sys_unlink+0x45/0x50 fs/namei.c:4402
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fecdf9e9cf7
RSP: 002b:00007ffc32867bc8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fecdf9e9cf7
RDX: 00007ffc32867bf0 RSI: 00007ffc32867c80 RDI: 00007ffc32867c80
RBP: 00007ffc32867c80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffc32868d10
R13: 00007fecdfa6ed7d R14: 00000000000202e6 R15: 00007ffc32868d50
rcu: rcu_preempt kthread starved for 10554 jiffies! g13845 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:28064 pid: 15 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11bb/0x4390 kernel/sched/core.c:6395
schedule+0x11b/0x1e0 kernel/sched/core.c:6478
schedule_timeout+0x15c/0x280 kernel/time/timer.c:1914
rcu_gp_fqs_loop+0x29e/0x11b0 kernel/rcu/tree.c:1972
rcu_gp_kthread+0x98/0x350 kernel/rcu/tree.c:2145
kthread+0x436/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
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: 5802 Comm: syz.1.456 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__this_cpu_preempt_check+0x0/0x10 lib/smp_processor_id.c:65
Code: 48 89 da e8 b2 76 f5 ff 48 8b 74 24 30 48 c7 c7 80 e8 59 8a e8 a1 76 f5 ff e8 6c 27 f8 ff eb a8 e8 d5 ee ff ff 0f 1f 44 00 00 <48> 89 fe 48 c7 c7 00 e8 59 8a e9 e1 fe ff ff 00 eb 1e 0f 1f 00 48
RSP: 0018:ffffc9000345fd98 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 166ca8d933e81400
RDX: 0000000000000000 RSI: ffffffff8a59e7e0 RDI: ffffffff8a0b29e0
RBP: ffffc9000345fec0 R08: dffffc0000000000 R09: fffffbfff1ad26b6
R10: fffffbfff1ad26b6 R11: 1ffffffff1ad26b5 R12: ffffffff8c11c720
R13: 1ffff9200068bfc0 R14: 0000000000000246 R15: dffffc0000000000
FS: 00007fa735a476c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9f06405f98 CR3: 0000000049fca000 CR4: 00000000003506e0
DR0: ffffffffbfffffff DR1: 00000000000001f8 DR2: 000000007a08253c
DR3: ffffffffefffff15 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lockdep_recursion_inc kernel/locking/lockdep.c:431 [inline]
lock_acquire+0x15f/0x3f0 kernel/locking/lockdep.c:5622
rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:313
rcu_read_lock include/linux/rcupdate.h:740 [inline]
__task_pid_nr_ns+0x21/0x420 kernel/pid.c:497
task_tgid_vnr include/linux/sched.h:1585 [inline]
__ia32_sys_getpid+0x19/0x20 kernel/sys.c:945
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fa7377f85e7
Code: 0b e9 68 fe ff ff 48 83 c4 18 48 8d 3d b2 62 d9 00 5b 5d 41 5c 41 5d 41 5e 41 5f e9 23 f8 fb ff 0f 1f 00 b8 27 00 00 00 0f 05 0f 1f 84 00 00 00 00 00 b8 6e 00 00 00 0f 05 c3 0f 1f 84 00 00
RSP: 002b:00007fa735a46b08 EFLAGS: 00000202 ORIG_RAX: 0000000000000027
RAX: ffffffffffffffda RBX: 00007fa735a46c70 RCX: 00007fa7377f85e7
RDX: 00007fa735a46b40 RSI: 00007fa735a46c70 RDI: 0000000000000021
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007fa737a58128 R14: 00007ffd93e96140 R15: 00007ffd93e96228