rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 GPs behind) idle=6a2c/1/0x4000000000000000 softirq=68762/68763 fqs=15 rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P16345/1:b..l P5814/1:b..l rcu: (detected by 1, t=10502 jiffies, g=65025, q=77 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 16336 Comm: syz.6.2659 Not tainted 6.13.0-rc2-syzkaller-00031-gf92f4749861b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:debug_spin_unlock kernel/locking/spinlock_debug.c:102 [inline] RIP: 0010:do_raw_spin_unlock+0xa0/0x230 kernel/locking/spinlock_debug.c:141 Code: d2 0f 85 6c 01 00 00 8b 03 85 c0 0f 84 f5 00 00 00 4c 8d 63 10 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 00 <0f> 85 67 01 00 00 65 48 8b 05 c2 af 8c 7e 48 39 43 10 0f 85 d8 00 RSP: 0018:ffffc90000007d08 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: ffffffff9aacdde8 RCX: ffffffff817728e3 RDX: 1ffffffff3559bbf RSI: 0000000000000004 RDI: ffffffff9aacdde8 RBP: 0000000000000002 R08: 0000000000000000 R09: fffffbfff3559bbd R10: ffffffff9aacddeb R11: 0000000000000006 R12: ffffffff9aacddf8 R13: dffffc0000000000 R14: ffff88805b88c340 R15: 1ffff92000000faa FS: 00007f415779d6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2f41eff8 CR3: 0000000027c4a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:150 [inline] _raw_spin_unlock_irqrestore+0x22/0x80 kernel/locking/spinlock.c:194 debug_object_deactivate+0x1ef/0x370 lib/debugobjects.c:888 debug_hrtimer_deactivate kernel/time/hrtimer.c:433 [inline] debug_deactivate kernel/time/hrtimer.c:475 [inline] __run_hrtimer kernel/time/hrtimer.c:1707 [inline] __hrtimer_run_queues+0x47c/0xae0 kernel/time/hrtimer.c:1803 hrtimer_interrupt+0x392/0x8e0 kernel/time/hrtimer.c:1865 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x10f/0x400 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:preempt_schedule_irq+0x4c/0x90 kernel/sched/core.c:7078 Code: df 55 65 48 8b 2d f4 d0 d9 74 53 48 89 eb 48 c1 eb 03 48 01 c3 bf 01 00 00 00 e8 8f 66 3e f6 e8 fa ac 77 f6 fb bf 01 00 00 00 0f 9d ff ff 9c 58 fa f6 c4 02 75 1e bf 01 00 00 00 e8 ed 15 3e RSP: 0018:ffffc9000d2ff458 EFLAGS: 00000202 RAX: 0000000000002115 RBX: ffffed100d5b9000 RCX: 1ffffffff2dc9b22 RDX: 0000000000000000 RSI: ffffffff8b6cd860 RDI: 0000000000000001 RBP: ffff88806adc8000 R08: 0000000000000001 R09: fffffbfff2dc9998 R10: ffffffff96e4ccc7 R11: 0000000000000006 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 irqentry_exit+0x36/0x90 kernel/entry/common.c:354 asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:709 RIP: 0010:queue_work_on+0x98/0x140 kernel/workqueue.c:2395 Code: e8 0d e5 36 00 48 85 ed 75 44 e8 93 e2 36 00 9c 5b 81 e3 00 02 00 00 31 ff 48 89 de e8 f1 e4 36 00 48 85 db 0f 85 8d 00 00 00 73 e2 36 00 44 89 e0 5b 5d 41 5c 41 5d 41 5e c3 cc cc cc cc e8 RSP: 0018:ffffc9000d2ff528 EFLAGS: 00000246 RAX: 0000000000080000 RBX: 0000000000000000 RCX: ffffc900123b4000 RDX: 0000000000080000 RSI: ffffffff81632152 RDI: 0000000000000007 RBP: 0000000000000200 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000009 R12: 0000000000000001 R13: 0000000000000008 R14: ffff88801b078800 R15: 0000000000000000 drm_fb_helper_damage drivers/gpu/drm/drm_fb_helper.c:694 [inline] drm_fb_helper_damage_area+0xaa/0xd0 drivers/gpu/drm/drm_fb_helper.c:696 bit_putcs_unaligned drivers/video/fbdev/core/bitblit.c:139 [inline] bit_putcs+0x90e/0xdf0 drivers/video/fbdev/core/bitblit.c:188 fbcon_putcs+0x364/0x480 drivers/video/fbdev/core/fbcon.c:1308 fbcon_redraw+0x473/0x500 drivers/video/fbdev/core/fbcon.c:1675 fbcon_scroll+0x43e/0x670 drivers/video/fbdev/core/fbcon.c:1848 con_scroll+0x45e/0x690 drivers/tty/vt/vt.c:579 lf+0x270/0x2c0 drivers/tty/vt/vt.c:1443 vc_con_write_normal drivers/tty/vt/vt.c:2999 [inline] do_con_write+0xc28/0x7bb0 drivers/tty/vt/vt.c:3096 con_write+0x23/0xb0 drivers/tty/vt/vt.c:3434 process_output_block drivers/tty/n_tty.c:574 [inline] n_tty_write+0x419/0x1140 drivers/tty/n_tty.c:2389 iterate_tty_write drivers/tty/tty_io.c:1015 [inline] file_tty_write.constprop.0+0x506/0x9a0 drivers/tty/tty_io.c:1090 new_sync_write fs/read_write.c:586 [inline] vfs_write+0x5ae/0x1150 fs/read_write.c:679 ksys_write+0x12b/0x250 fs/read_write.c:731 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f415697ff19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f415779d058 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f4156b45fa0 RCX: 00007f415697ff19 RDX: 0000000000001006 RSI: 0000000020000000 RDI: 0000000000000004 RBP: 00007f41569f3cc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f4156b45fa0 R15: 00007fffcabf7e98 task:syz-executor state:R running task stack:23424 pid:5814 tgid:5814 ppid:5809 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0xe58/0x5ad0 kernel/sched/core.c:6756 preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6935 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186 spin_unlock include/linux/spinlock.h:391 [inline] copy_pte_range mm/memory.c:1200 [inline] copy_pmd_range mm/memory.c:1261 [inline] copy_pud_range mm/memory.c:1298 [inline] copy_p4d_range mm/memory.c:1322 [inline] copy_page_range+0x1e15/0x57d0 mm/memory.c:1420 dup_mmap kernel/fork.c:751 [inline] dup_mm kernel/fork.c:1695 [inline] copy_mm kernel/fork.c:1744 [inline] copy_process+0x7e77/0x8df0 kernel/fork.c:2395 kernel_clone+0xfd/0x960 kernel/fork.c:2807 __do_sys_clone+0xba/0x100 kernel/fork.c:2950 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f898a376793 RSP: 002b:00007ffe777e41f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f898a376793 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 00005555777027d0 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000010ffd3 R14: 000000000010ff12 R15: 00007ffe777e4380 task:syz.4.2660 state:R running task stack:28608 pid:16345 tgid:16339 ppid:5812 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0xe58/0x5ad0 kernel/sched/core.c:6756 preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6935 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0x61/0x80 kernel/locking/spinlock.c:194 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] timerfd_clock_was_set+0x164/0x310 fs/timerfd.c:111 clock_was_set+0x67c/0x850 kernel/time/hrtimer.c:969 timekeeping_inject_offset+0x402/0x520 kernel/time/timekeeping.c:1481 do_adjtimex+0x369/0xaa0 kernel/time/timekeeping.c:2581 do_clock_adjtime kernel/time/posix-timers.c:1165 [inline] __do_sys_clock_adjtime+0x173/0x290 kernel/time/posix-timers.c:1177 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f331977ff19 RSP: 002b:00007f331a597058 EFLAGS: 00000246 ORIG_RAX: 0000000000000131 RAX: ffffffffffffffda RBX: 00007f3319946080 RCX: 00007f331977ff19 RDX: 0000000000000000 RSI: 0000000020000480 RDI: 0000000000000000 RBP: 00007f33197f3cc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f3319946080 R15: 00007fff6bc1a1a8 rcu: rcu_preempt kthread starved for 10472 jiffies! g65025 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:28424 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0xe58/0x5ad0 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6848 schedule_timeout+0x124/0x280 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2045 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2247 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 rcu: Stack dump where RCU GP kthread last ran: CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.13.0-rc2-syzkaller-00031-gf92f4749861b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline] RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:92 [inline] RIP: 0010:acpi_safe_halt+0x1a/0x20 drivers/acpi/processor_idle.c:112 Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 65 48 8b 05 b8 d5 da 74 48 8b 00 a8 08 75 0c 66 90 0f 00 2d 48 67 b4 00 fb f4 c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc900001a7d58 EFLAGS: 00000246 RAX: 0000000000004000 RBX: 0000000000000001 RCX: ffffffff8b28e679 RDX: 0000000000000001 RSI: ffff888143a8b000 RDI: ffff888143a8b064 RBP: ffff888143a8b064 R08: 0000000000000001 R09: ffffed10170e6fed R10: ffff8880b8737f6b R11: 0000000000000000 R12: ffff888140f54000 R13: ffffffff8ee14e20 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f331a596fb8 CR3: 00000000288d8000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: acpi_idle_enter+0xc5/0x160 drivers/acpi/processor_idle.c:699 cpuidle_enter_state+0xaa/0x4f0 drivers/cpuidle/cpuidle.c:268 cpuidle_enter+0x4e/0xa0 drivers/cpuidle/cpuidle.c:389 cpuidle_idle_call kernel/sched/idle.c:230 [inline] do_idle+0x310/0x3f0 kernel/sched/idle.c:325 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:423 start_secondary+0x222/0x2b0 arch/x86/kernel/smpboot.c:314 common_startup_64+0x13e/0x148 NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 16336 Comm: syz.6.2659 Not tainted 6.13.0-rc2-syzkaller-00031-gf92f4749861b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:check_wait_context kernel/locking/lockdep.c:4864 [inline] RIP: 0010:__lock_acquire+0x4ed/0x3c40 kernel/locking/lockdep.c:5176 Code: 00 48 8b 74 24 30 84 c0 48 ba 00 00 00 00 00 fc ff df 0f 44 c5 48 c1 ee 03 0f b6 14 16 84 d2 74 09 80 fa 03 0f 8e 04 10 00 00 <45> 8b 85 d8 0a 00 00 44 89 c3 83 eb 01 0f 88 7c 1b 00 00 48 bd 00 RSP: 0018:ffffc90000007be8 EFLAGS: 00000046 RAX: 0000000000000002 RBX: 0000000000080000 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 1ffff1100d5b915b RDI: ffff88806adc8bc9 RBP: 0000000000000002 R08: 0000000000000000 R09: fffffbfff2dc9999 R10: ffffffff96e4cccf R11: 0000000000000005 R12: 0000000000000002 R13: ffff88806adc8000 R14: 0000000000000040 R15: ffff88806adc8ba8 FS: 00007f415779d6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2f41eff8 CR3: 0000000027c4a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline] _raw_spin_lock_irq+0x36/0x50 kernel/locking/spinlock.c:170 __run_hrtimer kernel/time/hrtimer.c:1743 [inline] __hrtimer_run_queues+0x2be/0xae0 kernel/time/hrtimer.c:1803 hrtimer_interrupt+0x392/0x8e0 kernel/time/hrtimer.c:1865 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x10f/0x400 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:preempt_schedule_irq+0x4c/0x90 kernel/sched/core.c:7078 Code: df 55 65 48 8b 2d f4 d0 d9 74 53 48 89 eb 48 c1 eb 03 48 01 c3 bf 01 00 00 00 e8 8f 66 3e f6 e8 fa ac 77 f6 fb bf 01 00 00 00 0f 9d ff ff 9c 58 fa f6 c4 02 75 1e bf 01 00 00 00 e8 ed 15 3e RSP: 0018:ffffc9000d2ff458 EFLAGS: 00000202 RAX: 0000000000002115 RBX: ffffed100d5b9000 RCX: 1ffffffff2dc9b22 RDX: 0000000000000000 RSI: ffffffff8b6cd860 RDI: 0000000000000001 RBP: ffff88806adc8000 R08: 0000000000000001 R09: fffffbfff2dc9998 R10: ffffffff96e4ccc7 R11: 0000000000000006 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 irqentry_exit+0x36/0x90 kernel/entry/common.c:354 asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:709 RIP: 0010:queue_work_on+0x98/0x140 kernel/workqueue.c:2395 Code: e8 0d e5 36 00 48 85 ed 75 44 e8 93 e2 36 00 9c 5b 81 e3 00 02 00 00 31 ff 48 89 de e8 f1 e4 36 00 48 85 db 0f 85 8d 00 00 00 73 e2 36 00 44 89 e0 5b 5d 41 5c 41 5d 41 5e c3 cc cc cc cc e8 RSP: 0018:ffffc9000d2ff528 EFLAGS: 00000246 RAX: 0000000000080000 RBX: 0000000000000000 RCX: ffffc900123b4000 RDX: 0000000000080000 RSI: ffffffff81632152 RDI: 0000000000000007 RBP: 0000000000000200 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000009 R12: 0000000000000001 R13: 0000000000000008 R14: ffff88801b078800 R15: 0000000000000000 drm_fb_helper_damage drivers/gpu/drm/drm_fb_helper.c:694 [inline] drm_fb_helper_damage_area+0xaa/0xd0 drivers/gpu/drm/drm_fb_helper.c:696 bit_putcs_unaligned drivers/video/fbdev/core/bitblit.c:139 [inline] bit_putcs+0x90e/0xdf0 drivers/video/fbdev/core/bitblit.c:188 fbcon_putcs+0x364/0x480 drivers/video/fbdev/core/fbcon.c:1308 fbcon_redraw+0x473/0x500 drivers/video/fbdev/core/fbcon.c:1675 fbcon_scroll+0x43e/0x670 drivers/video/fbdev/core/fbcon.c:1848 con_scroll+0x45e/0x690 drivers/tty/vt/vt.c:579 lf+0x270/0x2c0 drivers/tty/vt/vt.c:1443 vc_con_write_normal drivers/tty/vt/vt.c:2999 [inline] do_con_write+0xc28/0x7bb0 drivers/tty/vt/vt.c:3096 con_write+0x23/0xb0 drivers/tty/vt/vt.c:3434 process_output_block drivers/tty/n_tty.c:574 [inline] n_tty_write+0x419/0x1140 drivers/tty/n_tty.c:2389 iterate_tty_write drivers/tty/tty_io.c:1015 [inline] file_tty_write.constprop.0+0x506/0x9a0 drivers/tty/tty_io.c:1090 new_sync_write fs/read_write.c:586 [inline] vfs_write+0x5ae/0x1150 fs/read_write.c:679 ksys_write+0x12b/0x250 fs/read_write.c:731 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f415697ff19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f415779d058 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f4156b45fa0 RCX: 00007f415697ff19 RDX: 0000000000001006 RSI: 0000000020000000 RDI: 0000000000000004 RBP: 00007f41569f3cc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f4156b45fa0 R15: 00007fffcabf7e98