rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P13324/1:b..l.. P13361/1:b..l..
rcu: (detected by 0, t=10502 jiffies, g=119249, q=1305 ncpus=1)
task:syz.8.1782 state:R running task stack:24072 pid:13361 tgid:13359 ppid:8704 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5830 kernel/sched/core.c:7382
preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7662
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:543 [inline]
irqentry_exit+0x14f/0x9b0 kernel/entry/common.c:154
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__rcu_read_lock+0x2f/0x60 kernel/rcu/tree_plugin.h:414
Code: 65 48 8b 1d 9b c0 34 13 48 81 c3 c4 04 00 00 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 75 18 ff 03 <8b> 03 3d 00 00 00 40 7d 07 5b e9 42 4a 60 0a cc 90 0f 0b 90 eb f3
RSP: 0018:ffffc90005d37110 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff88807d74e284 RCX: dffffc0000000000
RDX: dffffc0000000000 RSI: ffffffff81000130 RDI: ffffc90005d37200
RBP: 1ffff92000ba6e40 R08: ffffc90005d37290 R09: 000000000000000b
R10: ffffc90005d37218 R11: ffffffff81b3c670 R12: dffffc0000000000
R13: ffffc90005d37f48 R14: ffffc90005d371c8 R15: 1ffff92000ba6e39
rcu_read_lock include/linux/rcupdate.h:847 [inline]
class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
unwind_next_frame+0x88/0x2550 arch/x86/kernel/unwind_orc.c:495
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
save_stack+0x122/0x230 mm/page_owner.c:183
__reset_page_owner+0x73/0x2a0 mm/page_owner.c:338
reset_page_owner include/linux/page_owner.h:26 [inline]
__free_pages_prepare mm/page_alloc.c:1416 [inline]
free_unref_folios+0xdcc/0x15d0 mm/page_alloc.c:3032
folios_put_refs+0x5b6/0x6d0 mm/folio.c:1100
folio_batch_release include/linux/folio_batch.h:101 [inline]
shmem_undo_range+0x55a/0x1730 mm/shmem.c:1377
shmem_truncate_range mm/shmem.c:1513 [inline]
shmem_evict_inode+0x240/0xb00 mm/shmem.c:1657
evict+0x624/0xb50 fs/inode.c:822
dentry_kill+0x1b9/0x910 fs/dcache.c:856
finish_dput+0x1a/0x260 fs/dcache.c:1031
__fput+0x65b/0xa40 fs/file_table.c:521
fput_close_sync+0x11f/0x240 fs/file_table.c:619
filp_close_sync fs/open.c:1898 [inline]
__do_sys_close fs/open.c:2154 [inline]
__se_sys_close+0xa2/0x160 fs/open.c:2141
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x16a/0x530 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x00007ff8e1d6034e
RSP: 002b:00007ff8e2d34da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 00007ff8e2d356c0 RCX: 00007ff8e1d6034e
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007ff8e2d34ee0 R14: 00007ff8e2d34ea0 R15: 00007ff8d7a00000
task:syz.2.1760 state:R running task stack:26792 pid:13324 tgid:13323 ppid:10582 task_flags:0x40044c flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5830 kernel/sched/core.c:7382
preempt_schedule_common+0x7f/0xd0 kernel/sched/core.c:7561
preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:201 [inline]
_raw_spin_unlock+0x41/0x50 kernel/locking/spinlock.c:213
spin_unlock include/linux/spinlock.h:401 [inline]
zap_pte_range mm/memory.c:2059 [inline]
zap_pmd_range mm/memory.c:2117 [inline]
zap_pud_range mm/memory.c:2145 [inline]
zap_p4d_range mm/memory.c:2166 [inline]
__zap_vma_range+0x3d52/0x4b80 mm/memory.c:2206
unmap_vmas+0x38b/0x550 mm/memory.c:2275
exit_mmap+0x290/0xa40 mm/mmap.c:1315
__mmput+0x118/0x420 kernel/fork.c:1194
exit_mm+0x18e/0x240 kernel/exit.c:586
do_exit+0x6a8/0x2360 kernel/exit.c:967
do_group_exit+0x22d/0x2f0 kernel/exit.c:1123
get_signal+0x136a/0x1430 kernel/signal.c:3113
arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
exit_to_user_mode_loop+0x10e/0x770 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
do_syscall_64+0x32c/0x530 arch/x86/entry/syscall_64.c:107
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x00007ff1a759fb19
RSP: 002b:00007ff1a83bb0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007ff1a7825fa8 RCX: 00007ff1a759fb19
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007ff1a7825fa8
RBP: 00007ff1a7825fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff1a7826038 R14: 00007ffc1eab22f0 R15: 00007ffc1eab23d8
rcu: rcu_preempt kthread starved for 2468 jiffies! g119249 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:28104 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5830 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7474
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x1230 kernel/rcu/tree.c:2122
rcu_gp_kthread+0x9c/0x340 kernel/rcu/tree.c:2330
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 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:
CPU: 0 UID: 0 PID: 3231 Comm: kworker/R-bat_e Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
Workqueue: bat_events batadv_tt_purge
RIP: 0010:lock_acquire+0x232/0x350 kernel/locking/lockdep.c:5947
Code: ff ff ff e8 90 36 67 0a f7 44 24 10 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 32 c0 3e 13 48 3b 44 24 50 75 33 fb 48 83 c4 58 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 cf 49 6a 0a cc 48 8d 3d 27 4f 1d
RSP: 0018:ffffc90000007528 EFLAGS: 00000286
RAX: 13df9cebb7160500 RBX: 0000000000000000 RCX: 8000000000000101
RDX: 00000000105209fd RSI: ffffffff8e93c1df RDI: ffffffff8c8eba80
RBP: ffff888033d03e80 R08: ffffffff817889df R09: 0000000000000000
R10: ffffc90000007668 R11: fffff52000000ed9 R12: ffffffff9015a560
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000246
FS: 0000000000000000(0000) GS:ffff8881233f0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055c213c27d18 CR3: 000000005bb6a000 CR4: 00000000003526f0
Call Trace:
rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
rcu_read_lock include/linux/rcupdate.h:849 [inline]
class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
unwind_next_frame+0xac/0x2550 arch/x86/kernel/unwind_orc.c:495
__unwind_start+0x514/0x660 arch/x86/kernel/unwind_orc.c:787
unwind_start arch/x86/include/asm/unwind.h:64 [inline]
arch_stack_walk+0xe3/0x150 arch/x86/kernel/stacktrace.c:24
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3f/0x90 mm/kasan/common.c:79
unpoison_slab_object mm/kasan/common.c:354 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:380
kasan_slab_alloc include/linux/kasan.h:257 [inline]
slab_post_alloc_hook mm/slub.c:4716 [inline]
slab_alloc_node mm/slub.c:5029 [inline]
kmem_cache_alloc_noprof+0x2b4/0x600 mm/slub.c:5043
skb_clone+0x212/0x3a0 net/core/skbuff.c:2110
can_send+0x727/0xdb0 net/can/af_can.c:263
bcm_can_tx+0x5f3/0xba0 net/can/bcm.c:366
bcm_tx_timeout_handler+0x28b/0x550 net/can/bcm.c:545
__run_hrtimer kernel/time/hrtimer.c:2079 [inline]
__hrtimer_run_queues+0x3bc/0xa10 kernel/time/hrtimer.c:2136
hrtimer_run_softirq+0x1e3/0x2e0 kernel/time/hrtimer.c:2153
handle_softirqs+0x265/0x8d0 kernel/softirq.c:669
do_softirq+0x77/0xd0 kernel/softirq.c:569
__local_bh_enable_ip+0x100/0x140 kernel/softirq.c:473
spin_unlock_bh include/linux/spinlock.h:407 [inline]
batadv_tt_global_purge net/batman-adv/translation-table.c:2930 [inline]
batadv_tt_purge+0x4ee/0xa40 net/batman-adv/translation-table.c:4333
process_one_work kernel/workqueue.c:3505 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3588
rescuer_thread+0x84a/0x12a0 kernel/workqueue.c:3813
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245