rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5950/1:b..l P6055/1:b..l P4533/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=7525, q=1541 ncpus=2)
task:kworker/u8:9 state:R running task stack:23768 pid:4533 tgid:4533 ppid:2 task_flags:0x24248060 flags:0x00004000
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
context_switch kernel/sched/core.c:5397 [inline]
__schedule+0x116a/0x5dd0 kernel/sched/core.c:6786
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7109
irqentry_exit+0x36/0x90 kernel/entry/common.c:307
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:page_ext_next include/linux/page_ext.h:108 [inline]
RIP: 0010:page_ext_iter_next include/linux/page_ext.h:156 [inline]
RIP: 0010:__page_table_check_zero+0x2f3/0x5d0 mm/page_table_check.c:139
Code: c6 48 89 04 24 e8 2d e1 8e ff 48 8b 04 24 48 85 c0 0f 84 9c 00 00 00 e8 ab e5 8e ff 48 8b 44 24 18 80 38 00 0f 85 96 02 00 00 <4c> 03 25 46 6a b5 18 48 83 c5 01 e8 8d e5 8e ff 4d 85 e4 0f 85 ca
RSP: 0018:ffffc9000ea16f98 EFLAGS: 00000246
RAX: fffffbfff35c4da8 RBX: 0000000000056e77 RCX: ffffffff822d02d3
RDX: ffff88803579a440 RSI: ffffffff822d02e5 RDI: 0000000000000007
RBP: 0000000000000006 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000006e77 R11: 0000000000000001 R12: ffff88801e6284e0
R13: ffff88801e62852c R14: 0000000000000003 R15: dffffc0000000000
page_table_check_free include/linux/page_table_check.h:43 [inline]
free_pages_prepare mm/page_alloc.c:1249 [inline]
__free_frozen_pages+0x7df/0x1180 mm/page_alloc.c:2706
discard_slab mm/slub.c:2717 [inline]
__put_partials+0x16d/0x1c0 mm/slub.c:3186
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x4d/0x120 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4148 [inline]
slab_alloc_node mm/slub.c:4197 [inline]
kmem_cache_alloc_noprof+0x1cb/0x3b0 mm/slub.c:4204
new_handle fs/jbd2/transaction.c:457 [inline]
jbd2__journal_start+0x249/0x6a0 fs/jbd2/transaction.c:490
__ext4_journal_start_sb+0x195/0x690 fs/ext4/ext4_jbd2.c:115
__ext4_journal_start fs/ext4/ext4_jbd2.h:242 [inline]
ext4_do_writepages+0xc5f/0x3490 fs/ext4/inode.c:2846
ext4_writepages+0x37a/0x7d0 fs/ext4/inode.c:2953
do_writepages+0x277/0x600 mm/page-writeback.c:2636
__writeback_single_inode+0x160/0xfb0 fs/fs-writeback.c:1680
writeback_sb_inodes+0x601/0xf90 fs/fs-writeback.c:1976
wb_writeback+0x419/0xb70 fs/fs-writeback.c:2156
wb_do_writeback fs/fs-writeback.c:2303 [inline]
wb_workfn+0x14d/0xbe0 fs/fs-writeback.c:2343
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3321 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
task:fido_id state:R running task stack:23384 pid:6055 tgid:6055 ppid:5834 task_flags:0x400000 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5397 [inline]
__schedule+0x116a/0x5dd0 kernel/sched/core.c:6786
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7109
irqentry_exit+0x36/0x90 kernel/entry/common.c:307
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:trace_lock_release include/trace/events/lock.h:69 [inline]
RIP: 0010:lock_release+0x201/0x2f0 kernel/locking/lockdep.c:5882
Code: 8b 78 08 4c 89 e2 48 89 de e8 1b dc fe ff 65 ff 0d 04 7b 37 12 0f 85 39 fe ff ff e8 29 e0 93 ff e9 2f fe ff ff e8 7f e4 08 00 <84> c0 0f 85 42 fe ff ff 80 3d 73 0b f9 0e 00 0f 85 35 fe ff ff c6
RSP: 0018:ffffc9000518ee48 EFLAGS: 00000286
RAX: 0000000000000001 RBX: ffffffff8e5c4e00 RCX: ffffc90005190001
RDX: 0000000000000000 RSI: ffffffff8c157460 RDI: ffffffff8df3eda8
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 00000000000a7d34 R12: ffffffff816adac4
R13: ffffc9000518ef00 R14: ffffc9000518f3a0 R15: ffffc9000518ef34
rcu_lock_release include/linux/rcupdate.h:341 [inline]
rcu_read_unlock include/linux/rcupdate.h:871 [inline]
class_rcu_destructor include/linux/rcupdate.h:1155 [inline]
unwind_next_frame+0x3f9/0x20a0 arch/x86/kernel/unwind_orc.c:479
arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
save_stack+0x160/0x1f0 mm/page_owner.c:156
__reset_page_owner+0x84/0x1a0 mm/page_owner.c:308
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1248 [inline]
__free_frozen_pages+0x7fe/0x1180 mm/page_alloc.c:2706
discard_slab mm/slub.c:2717 [inline]
__put_partials+0x16d/0x1c0 mm/slub.c:3186
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x4d/0x120 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4148 [inline]
slab_alloc_node mm/slub.c:4197 [inline]
kmem_cache_alloc_noprof+0x1cb/0x3b0 mm/slub.c:4204
mt_alloc_one lib/maple_tree.c:176 [inline]
mas_alloc_nodes+0x18b/0x8b0 lib/maple_tree.c:1249
mas_node_count_gfp+0x105/0x130 lib/maple_tree.c:1331
mas_preallocate+0x7e0/0xde0 lib/maple_tree.c:5534
vma_iter_prealloc mm/vma.h:463 [inline]
__mmap_new_vma mm/vma.c:2461 [inline]
__mmap_region+0x1104/0x25e0 mm/vma.c:2622
mmap_region+0x1ab/0x3f0 mm/vma.c:2692
do_mmap+0xa3e/0x1210 mm/mmap.c:561
vm_mmap_pgoff+0x281/0x450 mm/util.c:579
vm_mmap+0x8e/0xc0 mm/util.c:615
elf_map fs/binfmt_elf.c:384 [inline]
elf_load+0x36d/0x780 fs/binfmt_elf.c:407
load_elf_binary+0x13c8/0x4f00 fs/binfmt_elf.c:1173
search_binary_handler fs/exec.c:1670 [inline]
exec_binprm fs/exec.c:1702 [inline]
bprm_execve fs/exec.c:1754 [inline]
bprm_execve+0x8c3/0x1650 fs/exec.c:1730
do_execveat_common.isra.0+0x4a5/0x610 fs/exec.c:1860
do_execve fs/exec.c:1934 [inline]
__do_sys_execve fs/exec.c:2010 [inline]
__se_sys_execve fs/exec.c:2005 [inline]
__x64_sys_execve+0x8e/0xb0 fs/exec.c:2005
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd620c1a107
RSP: 002b:00007fff2103f318 EFLAGS: 00000206 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 000055891fff4140 RCX: 00007fd620c1a107
RDX: 0000558957b76f40 RSI: 00007fff2103f430 RDI: 00007fff2103fc30
RBP: 0000000000000008 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000206 R12: 0000558957b76f40
R13: 00007fff2103f430 R14: 000000000000000d R15: 0000000000000009
task:kworker/0:7 state:R running task stack:25240 pid:5950 tgid:5950 ppid:2 task_flags:0x4208060 flags:0x00004000
Workqueue: events_power_efficient gc_worker
Call Trace:
context_switch kernel/sched/core.c:5397 [inline]
__schedule+0x116a/0x5dd0 kernel/sched/core.c:6786
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7109
irqentry_exit+0x36/0x90 kernel/entry/common.c:307
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x62/0x350 kernel/locking/lockdep.c:5875
Code: 76 37 12 83 f8 07 0f 87 bc 02 00 00 89 c0 48 0f a3 05 12 b8 10 0f 0f 82 74 02 00 00 8b 35 fa e9 10 0f 85 f6 0f 85 8d 00 00 00 <48> 8b 44 24 30 65 48 2b 05 a9 75 37 12 0f 85 c7 02 00 00 48 83 c4
RSP: 0018:ffffc9000439fae0 EFLAGS: 00000206
RAX: 0000000000000046 RBX: ffffffff8e5c4e00 RCX: 00000000450c12e1
RDX: 0000000000000000 RSI: ffffffff8de0b1d5 RDI: ffffffff8c1574e0
RBP: 0000000000000002 R08: 2c4b88301fba7ebf R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:841 [inline]
gc_worker+0x241/0x16e0 net/netfilter/nf_conntrack_core.c:1549
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3321 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: rcu_preempt kthread starved for 9859 jiffies! g7525 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:27784 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5397 [inline]
__schedule+0x116a/0x5dd0 kernel/sched/core.c:6786
__schedule_loop kernel/sched/core.c:6864 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6879
schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1ea/0xb00 kernel/rcu/tree.c:2054
rcu_gp_kthread+0x270/0x380 kernel/rcu/tree.c:2256
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.16.0-rc7-syzkaller-00120-g5f33ebd2018c #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:82
Code: 6b 6d 02 e9 83 fb 02 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 43 79 23 00 fb f4 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffc90000197df8 EFLAGS: 000002c6
RAX: 000000000180dc69 RBX: 0000000000000001 RCX: ffffffff8b869c99
RDX: 0000000000000000 RSI: ffffffff8de30472 RDI: ffffffff8c1574e0
RBP: ffffed1003c56488 R08: 0000000000000001 R09: ffffed10170a6645
R10: ffff8880b853322b R11: 0000000000000001 R12: 0000000000000001
R13: ffff88801e2b2440 R14: ffffffff90a94250 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888124820000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558c1405c8 CR3: 0000000060c1a000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:749
default_idle_call+0x6d/0xb0 kernel/sched/idle.c:117
cpuidle_idle_call kernel/sched/idle.c:185 [inline]
do_idle+0x391/0x510 kernel/sched/idle.c:325
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:423
start_secondary+0x21d/0x2b0 arch/x86/kernel/smpboot.c:315
common_startup_64+0x13e/0x148