rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (6 ticks this GP) idle=a17c/1/0x4000000000000000 softirq=36227/36227 fqs=4
rcu: (detected by 0, t=10503 jiffies, g=34409, q=109 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5844 Comm: syz-executor Not tainted 6.14.0-next-20250404-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:taprio_set_budgets+0x116/0x380 net/sched/sch_taprio.c:666
Code: 44 24 10 4c 89 74 24 18 4d 89 f5 45 31 ff 48 89 5c 24 08 bf 10 00 00 00 4c 89 fe e8 94 cc 9b f7 49 83 ff 0f 0f 87 7e 01 00 00 <4c> 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74
RSP: 0018:ffffc90000a08c10 EFLAGS: 00000093
RAX: 0000000000010000 RBX: ffff88807be47130 RCX: ffff888062451e00
RDX: 0000000000010000 RSI: 0000000000000001 RDI: 0000000000000010
RBP: 0000000000000000 R08: ffffffff8a27957c R09: 1ffff1100ab3d010
R10: dffffc0000000000 R11: ffffed100ab3d011 R12: 0000000000000004
R13: ffff8880559e8008 R14: ffff8880559e8000 R15: 0000000000000001
FS: 0000555562e12500(0000) GS:ffff88812508f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fea1ff0ce50 CR3: 0000000061442000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
advance_sched+0x98d/0xca0 net/sched/sch_taprio.c:977
__run_hrtimer kernel/time/hrtimer.c:1791 [inline]
__hrtimer_run_queues+0x5a6/0xd40 kernel/time/hrtimer.c:1855
hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1917
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
__sysvec_apic_timer_interrupt+0x110/0x420 arch/x86/kernel/apic/apic.c:1055
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:console_flush_all+0x998/0xec0 arch/x86/include/asm/irqflags.h:-1
Code: 48 21 c3 0f 85 16 02 00 00 e8 14 ee 20 00 4c 8b 7c 24 10 4d 85 f6 75 07 e8 05 ee 20 00 eb 06 e8 fe ed 20 00 fb 48 8b 5c 24 18 <48> 8b 44 24 30 42 80 3c 28 00 74 08 48 89 df e8 34 10 8b 00 4c 8b
RSP: 0018:ffffc9000419e740 EFLAGS: 00000293
RAX: ffffffff81a26f32 RBX: ffffffff8f5a3d98 RCX: ffff888062451e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000419e8f0 R08: ffffffff81a26f09 R09: 1ffffffff20bffa6
R10: dffffc0000000000 R11: fffffbfff20bffa7 R12: ffffffff8f5a3d40
R13: dffffc0000000000 R14: 0000000000000200 R15: ffffc9000419e940
__console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
console_unlock+0x151/0x3b0 kernel/printk/printk.c:3325
vprintk_emit+0x761/0xa40 kernel/printk/printk.c:2450
_printk+0xd5/0x120 kernel/printk/printk.c:2475
f2fs_printk+0x3ec/0x470 fs/f2fs/super.c:-1
f2fs_write_end_io+0x563/0x790 fs/f2fs/data.c:353
__submit_merged_bio+0x2a9/0x710 fs/f2fs/data.c:543
__f2fs_submit_merged_write fs/f2fs/data.c:639 [inline]
__submit_merged_write_cond fs/f2fs/data.c:661 [inline]
f2fs_submit_merged_write_cond+0x29f/0x380 fs/f2fs/data.c:678
f2fs_write_cache_pages fs/f2fs/data.c:3215 [inline]
__f2fs_write_data_pages fs/f2fs/data.c:3296 [inline]
f2fs_write_data_pages+0x2f99/0x38d0 fs/f2fs/data.c:3323
do_writepages+0x364/0x890 mm/page-writeback.c:2656
filemap_fdatawrite_wbc mm/filemap.c:386 [inline]
__filemap_fdatawrite_range mm/filemap.c:419 [inline]
__filemap_fdatawrite mm/filemap.c:425 [inline]
filemap_fdatawrite+0x1f2/0x2a0 mm/filemap.c:430
f2fs_sync_dirty_inodes+0x34f/0x860 fs/f2fs/checkpoint.c:1117
block_operations fs/f2fs/checkpoint.c:1257 [inline]
f2fs_write_checkpoint+0x857/0x1da0 fs/f2fs/checkpoint.c:1652
kill_f2fs_super+0x2b8/0x6d0 fs/f2fs/super.c:5026
deactivate_locked_super+0xc4/0x130 fs/super.c:473
cleanup_mnt+0x422/0x4c0 fs/namespace.c:1435
task_work_run+0x251/0x310 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efebcb8e497
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffc9735d498 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007efebcc0e08c RCX: 00007efebcb8e497
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc9735d550
RBP: 00007ffc9735d550 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc9735e5e0
R13: 00007efebcc0e08c R14: 000000000003d02f R15: 00007ffc9735e620
rcu: rcu_preempt kthread starved for 10490 jiffies! g34409 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:26688 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1b88/0x5240 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0x163/0x360 kernel/sched/core.c:6860
schedule_timeout+0x15b/0x2b0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x2e1/0x1340 kernel/rcu/tree.c:2046
rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2248
kthread+0x7b7/0x940 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
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: 6498 Comm: kworker/u8:9 Not tainted 6.14.0-next-20250404-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0x1bac/0x2d40 kernel/smp.c:885
Code: 03 84 c0 75 7e 45 8b 65 00 44 89 e6 83 e6 01 31 ff e8 18 e3 0b 00 41 83 e4 01 4c 8b 64 24 68 75 07 e8 c8 de 0b 00 eb 41 f3 90 <48> b8 00 00 00 00 00 fc ff df 0f b6 04 03 84 c0 75 11 41 f7 45 00
RSP: 0018:ffffc9000400f640 EFLAGS: 00000293
RAX: ffffffff81b77e8d RBX: 1ffff110170e7e91 RCX: ffff88805de35a00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000400f840 R08: ffffffff81b77e58 R09: 1ffffffff20bffa6
R10: dffffc0000000000 R11: fffffbfff20bffa7 R12: ffff8880b863ad08
R13: ffff8880b873f488 R14: ffff8880b863ad00 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff888124f8f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c37cf70 CR3: 000000000eb38000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052
on_each_cpu include/linux/smp.h:71 [inline]
text_poke_sync arch/x86/kernel/alternative.c:2455 [inline]
text_poke_bp_batch+0x44b/0xd40 arch/x86/kernel/alternative.c:2667
text_poke_flush arch/x86/kernel/alternative.c:2869 [inline]
text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2876
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
static_key_enable_cpuslocked+0x136/0x260 kernel/jump_label.c:210
static_key_enable+0x1a/0x20 kernel/jump_label.c:223
toggle_allocation_gate+0xc0/0x250 mm/kfence/core.c:850
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319
worker_thread+0x870/0xd50 kernel/workqueue.c:3400
kthread+0x7b7/0x940 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
watchdog: BUG: soft lockup - CPU#0 stuck for 246s! [kworker/u8:9:6498]
Modules linked in:
irq event stamp: 4176210
hardirqs last enabled at (4176209): [] irqentry_exit+0x63/0x90 kernel/entry/common.c:357
hardirqs last disabled at (4176210): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1049
softirqs last enabled at (4176208): [] __do_softirq kernel/softirq.c:613 [inline]
softirqs last enabled at (4176208): [] invoke_softirq kernel/softirq.c:453 [inline]
softirqs last enabled at (4176208): [] __irq_exit_rcu+0xfb/0x220 kernel/softirq.c:680
softirqs last disabled at (4176117): [] __do_softirq kernel/softirq.c:613 [inline]
softirqs last disabled at (4176117): [] invoke_softirq kernel/softirq.c:453 [inline]
softirqs last disabled at (4176117): [] __irq_exit_rcu+0xfb/0x220 kernel/softirq.c:680
CPU: 0 UID: 0 PID: 6498 Comm: kworker/u8:9 Not tainted 6.14.0-next-20250404-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0x1bac/0x2d40 kernel/smp.c:885
Code: 03 84 c0 75 7e 45 8b 65 00 44 89 e6 83 e6 01 31 ff e8 18 e3 0b 00 41 83 e4 01 4c 8b 64 24 68 75 07 e8 c8 de 0b 00 eb 41 f3 90 <48> b8 00 00 00 00 00 fc ff df 0f b6 04 03 84 c0 75 11 41 f7 45 00
RSP: 0018:ffffc9000400f640 EFLAGS: 00000293
RAX: ffffffff81b77e8d RBX: 1ffff110170e7e91 RCX: ffff88805de35a00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000400f840 R08: ffffffff81b77e58 R09: 1ffffffff20bffa6
R10: dffffc0000000000 R11: fffffbfff20bffa7 R12: ffff8880b863ad08
R13: ffff8880b873f488 R14: ffff8880b863ad00 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff888124f8f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c37cf70 CR3: 000000000eb38000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052
on_each_cpu include/linux/smp.h:71 [inline]
text_poke_sync arch/x86/kernel/alternative.c:2455 [inline]
text_poke_bp_batch+0x44b/0xd40 arch/x86/kernel/alternative.c:2667
text_poke_flush arch/x86/kernel/alternative.c:2869 [inline]
text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2876
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
static_key_enable_cpuslocked+0x136/0x260 kernel/jump_label.c:210
static_key_enable+0x1a/0x20 kernel/jump_label.c:223
toggle_allocation_gate+0xc0/0x250 mm/kfence/core.c:850
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319
worker_thread+0x870/0xd50 kernel/workqueue.c:3400
kthread+0x7b7/0x940 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5844 Comm: syz-executor Not tainted 6.14.0-next-20250404-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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+0x5a/0xb0 kernel/rcu/tree.c:736
Code: f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 5c c2 84 00 48 c7 c3 58 3b 6a 93 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 <84> c0 75 22 8b 03 65 ff 0d e9 52 c0 11 74 10 83 e0 04 c1 e8 02 5b
RSP: 0018:ffffc90000a08bc0 EFLAGS: 00000802
RAX: 0000000000000000 RBX: ffff8880b8732b58 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8ca1e040 RDI: ffffffff8ca1e000
RBP: ffffffff93691020 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffffff8a2787c0 R12: 0000000000000001
R13: 0000000000000000 R14: ffffffff8e7a0c68 R15: dffffc0000000000
FS: 0000555562e12500(0000) GS:ffff88812508f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fea1ff0ce50 CR3: 0000000061442000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
trace_lock_acquire include/trace/events/lock.h:24 [inline]
lock_acquire+0x5e/0x2f0 kernel/locking/lockdep.c:5829
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
advance_sched+0xab/0xca0 net/sched/sch_taprio.c:924
__run_hrtimer kernel/time/hrtimer.c:1791 [inline]
__hrtimer_run_queues+0x5a6/0xd40 kernel/time/hrtimer.c:1855
hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1917
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
__sysvec_apic_timer_interrupt+0x110/0x420 arch/x86/kernel/apic/apic.c:1055
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:console_flush_all+0x998/0xec0 arch/x86/include/asm/irqflags.h:-1
Code: 48 21 c3 0f 85 16 02 00 00 e8 14 ee 20 00 4c 8b 7c 24 10 4d 85 f6 75 07 e8 05 ee 20 00 eb 06 e8 fe ed 20 00 fb 48 8b 5c 24 18 <48> 8b 44 24 30 42 80 3c 28 00 74 08 48 89 df e8 34 10 8b 00 4c 8b
RSP: 0018:ffffc9000419e740 EFLAGS: 00000293
RAX: ffffffff81a26f32 RBX: ffffffff8f5a3d98 RCX: ffff888062451e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000419e8f0 R08: ffffffff81a26f09 R09: 1ffffffff20bffa6
R10: dffffc0000000000 R11: fffffbfff20bffa7 R12: ffffffff8f5a3d40
R13: dffffc0000000000 R14: 0000000000000200 R15: ffffc9000419e940
__console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
console_unlock+0x151/0x3b0 kernel/printk/printk.c:3325
vprintk_emit+0x761/0xa40 kernel/printk/printk.c:2450
_printk+0xd5/0x120 kernel/printk/printk.c:2475
f2fs_printk+0x3ec/0x470 fs/f2fs/super.c:-1
f2fs_write_end_io+0x563/0x790 fs/f2fs/data.c:353
__submit_merged_bio+0x2a9/0x710 fs/f2fs/data.c:543
__f2fs_submit_merged_write fs/f2fs/data.c:639 [inline]
__submit_merged_write_cond fs/f2fs/data.c:661 [inline]
f2fs_submit_merged_write_cond+0x29f/0x380 fs/f2fs/data.c:678
f2fs_write_cache_pages fs/f2fs/data.c:3215 [inline]
__f2fs_write_data_pages fs/f2fs/data.c:3296 [inline]
f2fs_write_data_pages+0x2f99/0x38d0 fs/f2fs/data.c:3323
do_writepages+0x364/0x890 mm/page-writeback.c:2656
filemap_fdatawrite_wbc mm/filemap.c:386 [inline]
__filemap_fdatawrite_range mm/filemap.c:419 [inline]
__filemap_fdatawrite mm/filemap.c:425 [inline]
filemap_fdatawrite+0x1f2/0x2a0 mm/filemap.c:430
f2fs_sync_dirty_inodes+0x34f/0x860 fs/f2fs/checkpoint.c:1117
block_operations fs/f2fs/checkpoint.c:1257 [inline]
f2fs_write_checkpoint+0x857/0x1da0 fs/f2fs/checkpoint.c:1652
kill_f2fs_super+0x2b8/0x6d0 fs/f2fs/super.c:5026
deactivate_locked_super+0xc4/0x130 fs/super.c:473
cleanup_mnt+0x422/0x4c0 fs/namespace.c:1435
task_work_run+0x251/0x310 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efebcb8e497
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffc9735d498 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007efebcc0e08c RCX: 00007efebcb8e497
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc9735d550
RBP: 00007ffc9735d550 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc9735e5e0
R13: 00007efebcc0e08c R14: 000000000003d02f R15: 00007ffc9735e620