rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P18434/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=94121, q=148 ncpus=2)
task:syz.5.3079 state:R running task stack:25592 pid:18434 tgid:18408 ppid:11188 task_flags:0x40044c flags:0x00080001
Call Trace:
context_switch kernel/sched/core.c:5360 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6964
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7291
irqentry_exit+0x6f/0x90 kernel/entry/common.c:211
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:873 [inline]
RIP: 0010:class_rcu_destructor include/linux/rcupdate.h:1169 [inline]
RIP: 0010:unwind_next_frame+0x19a9/0x2390 arch/x86/kernel/unwind_orc.c:680
Code: 39 0e 01 48 c7 c7 a0 60 a8 8b be 66 03 00 00 48 c7 c2 40 61 a8 8b e8 86 cd 29 00 48 c7 c7 60 d2 33 8e 4c 89 fe e8 67 b3 29 00 e2 56 33 00 89 d8 48 81 c4 98 00 00 00 5b 41 5c 41 5d 41 5e 41
RSP: 0018:ffffc9000e62ed18 EFLAGS: 00000282
RAX: 0543af85df563d00 RBX: ffffffff9053e201 RCX: 0543af85df563d00
RDX: 0000000000000000 RSI: ffffffff8dd9240a RDI: ffffffff8c03aa60
RBP: dffffc0000000000 R08: ffffc9000e62ee38 R09: 0000000000000000
R10: ffffc9000e62ee98 R11: fffff52001cc5dd5 R12: ffffc9000e62ee48
R13: ffffc9000e628000 R14: ffffc9000e62ee48 R15: ffffffff8173bd25
__unwind_start+0x5b9/0x760 arch/x86/kernel/unwind_orc.c:758
unwind_start arch/x86/include/asm/unwind.h:64 [inline]
arch_stack_walk+0xe4/0x150 arch/x86/kernel/stacktrace.c:24
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
save_stack+0xf5/0x1f0 mm/page_owner.c:156
__reset_page_owner+0x71/0x1f0 mm/page_owner.c:308
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1394 [inline]
free_unref_folios+0xdb3/0x14f0 mm/page_alloc.c:2963
folios_put_refs+0x584/0x670 mm/swap.c:1002
folio_batch_release include/linux/pagevec.h:101 [inline]
shmem_undo_range+0x49e/0x14b0 mm/shmem.c:1120
shmem_truncate_range mm/shmem.c:1232 [inline]
shmem_evict_inode+0x272/0xa70 mm/shmem.c:1360
evict+0x504/0x9c0 fs/inode.c:810
__dentry_kill+0x209/0x660 fs/dcache.c:669
dput+0x19f/0x2b0 fs/dcache.c:911
__fput+0x68e/0xa70 fs/file_table.c:476
task_work_run+0x1d4/0x260 kernel/task_work.c:227
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0x6b5/0x2300 kernel/exit.c:966
do_group_exit+0x21c/0x2d0 kernel/exit.c:1107
get_signal+0x1285/0x1340 kernel/signal.c:3034
arch_do_signal_or_restart+0xa0/0x790 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop+0x72/0x130 kernel/entry/common.c:40
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7b1118ec29
RSP: 002b:00007f7b11f95038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: 0000000000010106 RBX: 00007f7b113d6090 RCX: 00007f7b1118ec29
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000007
RBP: 00007f7b11211e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7b113d6128 R14: 00007f7b113d6090 R15: 00007ffc1b9bc948
rcu: rcu_preempt kthread starved for 10493 jiffies! g94121 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:26464 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5360 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6964
__schedule_loop kernel/sched/core.c:7046 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7061
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+0x4bc/0x870 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 18452 Comm: syz.0.3084 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:146 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:172 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:191 [inline]
RIP: 0010:kasan_check_range+0x297/0x2c0 mm/kasan/generic.c:200
Code: 49 83 c3 04 eb 10 4d 01 f3 49 83 c3 05 eb 07 4d 01 f3 49 83 c3 06 4d 89 dc 4d 85 db 0f 84 44 ff ff ff 4d 01 d1 4d 39 cc 75 11 <41> 83 e0 07 45 0f be 09 45 39 c8 0f 8c 2b ff ff ff 0f b6 d2 e8 d0
RSP: 0000:ffffc90000007b08 EFLAGS: 00000046
RAX: 00000000ffffff01 RBX: ffffffffffffffff RCX: ffffffff819e1de1
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90000007b80
RBP: ffffc90000007bf0 R08: ffffc90000007b83 R09: fffff52000000f70
R10: dffffc0000000000 R11: fffff52000000f70 R12: fffff52000000f70
R13: ffffffff99ebd208 R14: fffff52000000f71 R15: 1ffff92000000f70
FS: 00007fbba8d336c0(0000) GS:ffff8881259e7000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbba8d32f98 CR3: 000000005bd74000 CR4: 00000000003526f0
DR0: 0000000000000008 DR1: 0000000000000002 DR2: 0000000000000081
DR3: ffffffffefffff14 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1301 [inline]
queued_spin_lock include/asm-generic/qspinlock.h:111 [inline]
do_raw_spin_lock+0x121/0x290 kernel/locking/spinlock_debug.c:116
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
_raw_spin_lock_irqsave+0xb3/0xf0 kernel/locking/spinlock.c:162
debug_object_deactivate+0x9a/0x250 lib/debugobjects.c:873
debug_hrtimer_deactivate kernel/time/hrtimer.c:443 [inline]
debug_deactivate+0x1d/0x200 kernel/time/hrtimer.c:483
__run_hrtimer kernel/time/hrtimer.c:1745 [inline]
__hrtimer_run_queues+0x2b0/0xc60 kernel/time/hrtimer.c:1841
hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
__sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1058
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1052
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:update_node lib/xarray.c:-1 [inline]
RIP: 0010:xas_store+0xacb/0x1880 lib/xarray.c:852
Code: 1b a9 a1 f6 4c 8b 7c 24 08 48 8b 5d 00 48 85 db 74 1f e8 d8 0c 3d f6 4c 89 ff 49 89 db 2e e8 68 90 7f 14 eb 11 e8 c5 0c 3d f6 <48> 8b 5c 24 10 eb 1e e8 b9 0c 3d f6 48 8b 5c 24 10 31 ff 44 89 e6
RSP: 0000:ffffc9000cad7730 EFLAGS: 00000246
RAX: ffffffff8b82cbab RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9000cf1e000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: 0000000000000000 R08: ffffc9000cad781f R09: 0000000000000000
R10: ffffc9000cad7808 R11: fffff5200195af04 R12: ffffc9000cad77e8
R13: 0000000000000000 R14: dffffc0000000000 R15: ffffc9000cad7800
__xa_erase lib/xarray.c:1649 [inline]
xa_erase+0x6a/0xf0 lib/xarray.c:1670
zswap_invalidate+0xc3/0x120 mm/zswap.c:1670
swap_range_free mm/swapfile.c:1276 [inline]
swap_entries_free+0x304/0x820 mm/swapfile.c:1712
swap_entries_put_cache+0x1f2/0x3b0 mm/swapfile.c:1606
swap_cache_del_folio+0x16b/0x2d0 mm/swap_state.c:234
folio_free_swap+0x273/0x370 mm/swapfile.c:1917
do_swap_page+0x1fd6/0x5920 mm/memory.c:4961
handle_pte_fault mm/memory.c:6229 [inline]
__handle_mm_fault+0xe55/0x5400 mm/memory.c:6367
handle_mm_fault+0x40a/0x8e0 mm/memory.c:6536
do_user_addr_fault+0xa7c/0x1380 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7fbba7e4e24e
Code: f6 31 c0 e8 94 f2 13 00 48 81 c4 90 00 00 00 48 98 5b c3 66 0f 1f 84 00 00 00 00 00 41 54 55 53 48 89 fb 48 81 ec d0 00 00 00 <48> 89 74 24 28 48 89 54 24 30 48 89 4c 24 38 4c 89 44 24 40 4c 89
RSP: 002b:00007fbba8d32f70 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 00007fbba80131a6 RCX: 00007fbba8024770
RDX: 00000000000f3556 RSI: 0000000000000001 RDI: 00007fbba80131a6
RBP: 00007fbba8024770 R08: ffffffffffffffff R09: 7fffffffffffffff
R10: 3fffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbba81d6128 R14: 00007fbba81d6090 R15: 00007ffed71dff48