rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4951/1:b..l P9586/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=91225, q=200 ncpus=2)
task:syz-executor state:R running task stack:20744 pid:9586 ppid:9560 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6701
preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7011
irqentry_exit+0x67/0x70 kernel/entry/common.c:441
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__page_table_check_zero+0x148/0x4b0 mm/page_table_check.c:-1
Code: e8 3d 7f 9c ff 48 81 e3 00 08 00 00 0f 85 d8 01 00 00 4c 89 f7 e8 28 f9 ff ff 48 85 c0 0f 84 66 01 00 00 49 89 c6 8b 74 24 04 <41> 89 f7 bf 40 00 00 00 e8 7b 7e 9c ff 31 db 49 c7 c5 40 ca 35 97
RSP: 0018:ffffc900032af6d0 EFLAGS: 00000286
RAX: ffff88801a52b328 RBX: 0000000000000000 RCX: ffff88802d618000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: dffffc0000000000 R09: 1ffffffff223d6a0
R10: dffffc0000000000 R11: fffffbfff223d6a1 R12: 00fff00000000000
R13: 0000000000000000 R14: ffff88801a52b328 R15: ffffea0001309f40
page_table_check_free include/linux/page_table_check.h:41 [inline]
free_pages_prepare mm/page_alloc.c:1183 [inline]
free_unref_page_prepare+0x7e6/0x8f0 mm/page_alloc.c:2366
free_unref_page_list+0xbe/0x860 mm/page_alloc.c:2505
release_pages+0x208a/0x2300 mm/swap.c:1022
__folio_batch_release+0x71/0xe0 mm/swap.c:1042
folio_batch_release include/linux/pagevec.h:83 [inline]
shmem_undo_range+0x5ff/0x1a80 mm/shmem.c:1026
shmem_truncate_range mm/shmem.c:1135 [inline]
shmem_evict_inode+0x285/0xa70 mm/shmem.c:1264
evict+0x4b7/0x8a0 fs/inode.c:705
do_unlinkat+0x38c/0x590 fs/namei.c:4453
__do_sys_unlink fs/namei.c:4494 [inline]
__se_sys_unlink fs/namei.c:4492 [inline]
__x64_sys_unlink+0x49/0x50 fs/namei.c:4492
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd7ac59d247
RSP: 002b:00007fffdf049ae8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd7ac59d247
RDX: 00007fffdf049b10 RSI: 00007fffdf049ba0 RDI: 00007fffdf049ba0
RBP: 00007fffdf049ba0 R08: 00007fffdf04aba0 R09: 00000000ffffffff
R10: 0000000000000100 R11: 0000000000000206 R12: 00007fffdf04ac30
R13: 00007fd7ac6344bb R14: 000000000012624b R15: 00007fffdf04ac70
task:kworker/u4:9 state:R running task stack:22664 pid:4951 ppid:2 flags:0x00004000
Workqueue: events_unbound async_run_entry_fn
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6701
preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7011
irqentry_exit+0x67/0x70 kernel/entry/common.c:441
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:lock_acquire+0x208/0x420 kernel/locking/lockdep.c:5760
Code: f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3c 04 f8 0f 85 f0 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 3c 00 00 00 00 43 c7 44 3c 08 00 00 00 00 65 48 8b 04 25
RSP: 0018:ffffc9000f67f560 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: dc6583eefac52f00
RDX: 0000000000000000 RSI: ffffffff8acade60 RDI: ffffffff8b1d3ba0
RBP: ffffc9000f67f670 R08: dffffc0000000000 R09: 1ffffffff223d6a0
R10: dffffc0000000000 R11: fffffbfff223d6a1 R12: 1ffff92001ecfeb8
R13: ffffffff8d1320e0 R14: 0000000000000246 R15: dffffc0000000000
rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
rcu_read_lock include/linux/rcupdate.h:786 [inline]
page_ext_get+0x3e/0x2b0 mm/page_ext.c:508
__page_table_check_zero+0x138/0x4b0 mm/page_table_check.c:148
page_table_check_free include/linux/page_table_check.h:41 [inline]
free_pages_prepare mm/page_alloc.c:1183 [inline]
free_unref_page_prepare+0x7e6/0x8f0 mm/page_alloc.c:2366
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2459
__slab_free+0x35a/0x400 mm/slub.c:3736
qlink_free mm/kasan/quarantine.c:166 [inline]
qlist_free_all+0x75/0xd0 mm/kasan/quarantine.c:185
kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:306
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:770
slab_alloc_node mm/slub.c:3495 [inline]
__kmem_cache_alloc_node+0x194/0x250 mm/slub.c:3534
kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1098
kmalloc include/linux/slab.h:600 [inline]
kzalloc include/linux/slab.h:721 [inline]
_request_firmware_prepare drivers/base/firmware_loader/main.c:745 [inline]
_request_firmware+0x2c3/0x1520 drivers/base/firmware_loader/main.c:894
request_firmware drivers/base/firmware_loader/main.c:987 [inline]
cache_firmware drivers/base/firmware_loader/main.c:1289 [inline]
__async_dev_cache_fw_image+0x7f/0x240 drivers/base/firmware_loader/main.c:1403
async_run_entry_fn+0x97/0x3f0 kernel/async.c:127
process_one_work kernel/workqueue.c:2657 [inline]
process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2734
worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2815
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: rcu_preempt kthread starved for 9687 jiffies! g91225 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:27848 pid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6701
schedule+0xbd/0x170 kernel/sched/core.c:6775
schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
rcu_gp_fqs_loop+0x30d/0x1590 kernel/rcu/tree.c:1667
rcu_gp_kthread+0x9d/0x3b0 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/08/2026
RIP: 0010:pv_native_safe_halt+0xf/0x10 arch/x86/kernel/paravirt.c:148
Code: 89 18 02 c3 cc cc cc cc cc cc cc f3 0f 1e fa 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 66 90 0f 00 2d 03 f6 36 00 fb f4 66 0f 1f 00 55 41 57 41 56 41 54 53 50 8b 2f eb 2c 89 cb 80 f9
RSP: 0018:ffffc90000187de0 EFLAGS: 000002c6
RAX: ba98070ff2c35200 RBX: ffffffff81631d11 RCX: ba98070ff2c35200
RDX: 0000000000000001 RSI: ffffffff8acacce0 RDI: ffffffff8b1d3ba0
RBP: ffffc90000187f20 R08: ffff8880b8f36b6b R09: 1ffff110171e6d6d
R10: dffffc0000000000 R11: ffffed10171e6d6e R12: 1ffff92000030fc8
R13: dffffc0000000000 R14: 1ffff11003848780 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31c15ff8 CR3: 0000000050e61000 CR4: 00000000003506e0
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:108 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:753
default_idle_call+0x6c/0xa0 kernel/sched/idle.c:97
cpuidle_idle_call kernel/sched/idle.c:178 [inline]
do_idle+0x221/0x5c0 kernel/sched/idle.c:302
cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:401
start_secondary+0xee/0xf0 arch/x86/kernel/smpboot.c:323
secondary_startup_64_no_verify+0x179/0x17b