rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (0 ticks this GP) idle=50ac/1/0x4000000000000000 softirq=168620/168620 fqs=0
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P17218/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=96669, q=503 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 19615 Comm: syz.4.2608 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline]
RIP: 0010:raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline]
RIP: 0010:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline]
RIP: 0010:rcu_is_watching+0x5e/0xb0 kernel/rcu/tree.c:751
Code: 03 42 80 3c 38 00 74 08 4c 89 f7 e8 7c f2 7c 00 48 c7 c3 98 3f c3 92 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 84 c0 75 34 <8b> 03 65 ff 0d e9 c9 1a 11 74 11 83 e0 04 c1 e8 02 5b 41 5e 41 5f
RSP: 0018:ffffc90000007ce8 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff8880b8632f98 RCX: 484b688cb4d72500
RDX: ffff88801ebc3c00 RSI: ffffffff8c035860 RDI: ffffffff8c035820
RBP: 0000000000000001 R08: ffffffff8fc40337 R09: 1ffffffff1f88066
R10: dffffc0000000000 R11: fffffbfff1f88067 R12: dffffc0000000000
R13: 0000000000000000 R14: ffffffff8dde4dd0 R15: dffffc0000000000
FS: 00007f0afcb656c0(0000) GS:ffff8881259ff000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000b000 CR3: 0000000065758000 CR4: 00000000003526f0
Call Trace:
trace_hrtimer_start include/trace/events/timer.h:222 [inline]
debug_activate kernel/time/hrtimer.c:485 [inline]
enqueue_hrtimer+0x9d/0x3a0 kernel/time/hrtimer.c:1088
__run_hrtimer kernel/time/hrtimer.c:1778 [inline]
__hrtimer_run_queues+0x656/0xc60 kernel/time/hrtimer.c:1825
hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
__sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1056
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:security_vm_enough_memory_mm+0x2f4/0x4f0 security/security.c:1268
Code: 44 fd eb 0f e8 2d 22 44 fd e9 f6 01 00 00 e8 23 22 44 fd 48 8b 3d ac 03 62 09 e8 b7 7f 79 fd 89 c5 31 ff 89 c6 e8 4c 26 44 fd <85> ed 7e 58 4c 8b 3d 89 03 62 09 49 83 c7 08 4c 89 f8 48 c1 e8 03
RSP: 0018:ffffc9001221f810 EFLAGS: 00000297
RAX: ffffffff847c6cc4 RBX: 0000000000000001 RCX: 0000000000000002
RDX: ffff88801ebc3c00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff99e7d0a3 R09: 1ffffffff33cfa14
R10: dffffc0000000000 R11: fffffbfff33cfa15 R12: dffffc0000000000
R13: ffff88801ebc4158 R14: ffff8880299d6b80 R15: 0000000000000000
shmem_acct_blocks mm/shmem.c:212 [inline]
shmem_inode_acct_blocks+0xd9/0x470 mm/shmem.c:228
shmem_alloc_and_add_folio+0x8bc/0xf60 mm/shmem.c:1977
shmem_get_folio_gfp+0x59d/0x1660 mm/shmem.c:2597
shmem_get_folio mm/shmem.c:2703 [inline]
shmem_write_begin+0xf7/0x2b0 mm/shmem.c:3353
generic_perform_write+0x2c2/0x900 mm/filemap.c:4188
shmem_file_write_iter+0xf8/0x120 mm/shmem.c:3528
new_sync_write fs/read_write.c:593 [inline]
vfs_write+0x5c9/0xb30 fs/read_write.c:686
ksys_write+0x145/0x250 fs/read_write.c:738
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0afbd8d69f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007f0afcb64df0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000001000000 RCX: 00007f0afbd8d69f
RDX: 0000000001000000 RSI: 00007f0af1a00000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000005593
R10: 0000000000000002 R11: 0000000000000293 R12: 0000000000000003
R13: 00007f0afcb64ef0 R14: 00007f0afcb64eb0 R15: 00007f0af1a00000
task:syz-executor state:R running task stack:22176 pid:17218 tgid:17218 ppid:17182 task_flags:0x400140 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:7145
preempt_schedule+0xae/0xc0 kernel/sched/core.c:7169
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
copy_pte_range mm/memory.c:1329 [inline]
copy_pmd_range+0x7630/0x7f00 mm/memory.c:1389
copy_pud_range mm/memory.c:1426 [inline]
copy_p4d_range mm/memory.c:1450 [inline]
copy_page_range+0xc14/0x1270 mm/memory.c:1538
dup_mmap+0xf57/0x1ac0 mm/mmap.c:1834
dup_mm kernel/fork.c:1488 [inline]
copy_mm+0x13c/0x4b0 kernel/fork.c:1540
copy_process+0x1706/0x3c00 kernel/fork.c:2178
kernel_clone+0x21e/0x840 kernel/fork.c:2608
__do_sys_clone kernel/fork.c:2751 [inline]
__se_sys_clone kernel/fork.c:2735 [inline]
__x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2735
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2a10d85453
RSP: 002b:00007ffd36cc8e38 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2a10d85453
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 00005555717277d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 0000000000097520 R15: 00007ffd36cc8fd0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g96669 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=41477
rcu: rcu_preempt kthread starved for 10502 jiffies! g96669 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27424 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x47c/0x820 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245