syzbot

smpboot: Booting Node 0 Processor 1 APIC 0x1
------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.27/6024 is trying to acquire lock:
ffffffff8e2d6ac0 (console_owner){....}-{0:0}, at: console_lock_spinning_enable+0x61/0x80 kernel/printk/printk.c:1900

but task is already holding lock:
ffff8880b843add8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:647 [inline]
ffff8880b843add8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x7e/0x130 kernel/sched/core.c:632

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #4 (&rq->__lock){-.-.}-{2:2}:
       _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
       raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:639
       raw_spin_rq_lock kernel/sched/sched.h:1558 [inline]
       task_rq_lock+0xcf/0x490 kernel/sched/core.c:739
       cgroup_move_task+0x81/0x2a0 kernel/sched/psi.c:1170
       css_set_move_task+0x288/0x5f0 kernel/cgroup/cgroup.c:951
       cgroup_post_fork+0x201/0x9e0 kernel/cgroup/cgroup.c:6913
       copy_process+0x56b6/0x7430 kernel/fork.c:2465
       kernel_clone+0xfc/0x910 kernel/fork.c:2651
       user_mode_thread+0xc8/0x110 kernel/fork.c:2727
       rest_init+0x23/0x2b0 init/main.c:722
       start_kernel+0x3ef/0x4d0 init/main.c:1206
       x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:310
       x86_64_start_kernel+0x130/0x190 arch/x86/kernel/head64.c:291
       common_startup_64+0x13e/0x148

-> #3 (&p->pi_lock){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
       class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:557 [inline]
       try_to_wake_up+0xb7/0x1860 kernel/sched/core.c:4106
       __wake_up_common+0x135/0x1f0 kernel/sched/wait.c:108
       __wake_up_common_lock kernel/sched/wait.c:125 [inline]
       __wake_up+0x31/0x60 kernel/sched/wait.c:146
       tty_port_default_wakeup+0x4d/0x60 drivers/tty/tty_port.c:67
       serial8250_tx_chars+0x68e/0x860 drivers/tty/serial/8250/8250_port.c:1719
       serial8250_handle_irq+0x761/0xcb0 drivers/tty/serial/8250/8250_port.c:1827
       serial8250_default_handle_irq+0x9e/0x270 drivers/tty/serial/8250/8250_port.c:1846
       serial8250_interrupt+0xf8/0x1d0 drivers/tty/serial/8250/8250_core.c:86
       __handle_irq_event_percpu+0x236/0x890 kernel/irq/handle.c:211
       handle_irq_event_percpu kernel/irq/handle.c:248 [inline]
       handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:265
       handle_edge_irq+0x3ca/0x9e0 kernel/irq/chip.c:855
       generic_handle_irq_desc include/linux/irqdesc.h:172 [inline]
       handle_irq arch/x86/kernel/irq.c:255 [inline]
       call_irq_handler arch/x86/kernel/irq.c:311 [inline]
       __common_interrupt+0xd0/0x2f0 arch/x86/kernel/irq.c:326
       common_interrupt+0xba/0xe0 arch/x86/kernel/irq.c:319
       asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688
       native_save_fl arch/x86/include/asm/irqflags.h:26 [inline]
       arch_local_save_flags arch/x86/include/asm/irqflags.h:109 [inline]
       arch_local_irq_save arch/x86/include/asm/irqflags.h:127 [inline]
       lock_release+0x8f/0x2d0 kernel/locking/lockdep.c:5885
       rcu_lock_release include/linux/rcupdate.h:341 [inline]
       rcu_read_unlock include/linux/rcupdate.h:897 [inline]
       class_rcu_destructor include/linux/rcupdate.h:1195 [inline]
       unwind_next_frame+0x3f9/0x20b0 arch/x86/kernel/unwind_orc.c:495
       arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25
       stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
       kasan_save_stack+0x33/0x60 mm/kasan/common.c:57
       kasan_save_track+0x14/0x30 mm/kasan/common.c:78
       kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:584
       poison_slab_object mm/kasan/common.c:253 [inline]
       __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
       kasan_slab_free include/linux/kasan.h:235 [inline]
       slab_free_hook mm/slub.c:2540 [inline]
       slab_free mm/slub.c:6670 [inline]
       kfree+0x2f8/0x6e0 mm/slub.c:6878
       skb_kfree_head net/core/skbuff.c:1068 [inline]
       skb_free_head+0x114/0x210 net/core/skbuff.c:1080
       skb_release_data+0x795/0x9e0 net/core/skbuff.c:1107
       skb_release_all net/core/skbuff.c:1182 [inline]
       __kfree_skb net/core/skbuff.c:1196 [inline]
       consume_skb net/core/skbuff.c:1428 [inline]
       consume_skb+0xbf/0x100 net/core/skbuff.c:1422
       __unix_dgram_recvmsg+0x779/0xc30 net/unix/af_unix.c:2658
       unix_dgram_recvmsg+0xd0/0x110 net/unix/af_unix.c:2675
       sock_recvmsg_nosec net/socket.c:1078 [inline]
       sock_recvmsg+0x1f9/0x250 net/socket.c:1100
       sock_read_iter+0x2b9/0x3b0 net/socket.c:1170
       new_sync_read fs/read_write.c:491 [inline]
       vfs_read+0xa98/0xcf0 fs/read_write.c:572
       ksys_read+0x1f8/0x250 fs/read_write.c:715
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (&tty->write_wait){-.-.}-{3:3}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
       __wake_up_common_lock kernel/sched/wait.c:124 [inline]
       __wake_up+0x1c/0x60 kernel/sched/wait.c:146
       tty_port_default_wakeup+0x4d/0x60 drivers/tty/tty_port.c:67
       serial8250_tx_chars+0x68e/0x860 drivers/tty/serial/8250/8250_port.c:1719
       serial8250_handle_irq+0x761/0xcb0 drivers/tty/serial/8250/8250_port.c:1827
       serial8250_default_handle_irq+0x9e/0x270 drivers/tty/serial/8250/8250_port.c:1846
       serial8250_interrupt+0xf8/0x1d0 drivers/tty/serial/8250/8250_core.c:86
       __handle_irq_event_percpu+0x236/0x890 kernel/irq/handle.c:211
       handle_irq_event_percpu kernel/irq/handle.c:248 [inline]
       handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:265
       handle_edge_irq+0x3ca/0x9e0 kernel/irq/chip.c:855
       generic_handle_irq_desc include/linux/irqdesc.h:172 [inline]
       handle_irq arch/x86/kernel/irq.c:255 [inline]
       call_irq_handler arch/x86/kernel/irq.c:311 [inline]
       __common_interrupt+0xd0/0x2f0 arch/x86/kernel/irq.c:326
       common_interrupt+0xba/0xe0 arch/x86/kernel/irq.c:319
       asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688
       native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
       pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:81
       arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
       default_idle+0x13/0x20 arch/x86/kernel/process.c:767
       default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122
       cpuidle_idle_call kernel/sched/idle.c:191 [inline]
       do_idle+0x38d/0x510 kernel/sched/idle.c:332
       cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:430
       rest_init+0x16b/0x2b0 init/main.c:757
       start_kernel+0x3ef/0x4d0 init/main.c:1206
       x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:310
       x86_64_start_kernel+0x130/0x190 arch/x86/kernel/head64.c:291
       common_startup_64+0x13e/0x148

-> #1 (&port_lock_key){-.-.}-{3:3}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
       uart_port_lock_irqsave include/linux/serial_core.h:717 [inline]
       serial8250_console_write+0x181/0x1890 drivers/tty/serial/8250/8250_port.c:3301
       console_emit_next_record kernel/printk/printk.c:3129 [inline]
       console_flush_one_record+0x796/0xc60 kernel/printk/printk.c:3215
       console_flush_all kernel/printk/printk.c:3289 [inline]
       __console_flush_and_unlock kernel/printk/printk.c:3319 [inline]
       console_unlock+0xef/0x240 kernel/printk/printk.c:3359
       vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2426
       _printk+0xc7/0x100 kernel/printk/printk.c:2451
       register_console+0x823/0x1210 kernel/printk/printk.c:4170
       univ8250_console_init+0x5f/0x90 drivers/tty/serial/8250/8250_core.c:515
       console_init+0x152/0x600 kernel/printk/printk.c:4369
       start_kernel+0x298/0x4d0 init/main.c:1143
       x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:310
       x86_64_start_kernel+0x130/0x190 arch/x86/kernel/head64.c:291
       common_startup_64+0x13e/0x148

-> #0 (console_owner){....}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3165 [inline]
       check_prevs_add kernel/locking/lockdep.c:3284 [inline]
       validate_chain kernel/locking/lockdep.c:3908 [inline]
       __lock_acquire+0x1669/0x2890 kernel/locking/lockdep.c:5237
       lock_acquire kernel/locking/lockdep.c:5868 [inline]
       lock_acquire+0x179/0x330 kernel/locking/lockdep.c:5825
       console_lock_spinning_enable+0x72/0x80 kernel/printk/printk.c:1900
       console_emit_next_record kernel/printk/printk.c:3123 [inline]
       console_flush_one_record+0x73f/0xc60 kernel/printk/printk.c:3215
       console_flush_all kernel/printk/printk.c:3289 [inline]
       __console_flush_and_unlock kernel/printk/printk.c:3319 [inline]
       console_unlock+0xef/0x240 kernel/printk/printk.c:3359
       vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2426
       _printk+0xc7/0x100 kernel/printk/printk.c:2451
       __report_bug+0x3a6/0x520 lib/bug.c:243
       report_bug+0xb2/0x220 lib/bug.c:281
       handle_bug+0x127/0x260 arch/x86/kernel/traps.c:435
       exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:489
       asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:616
       lockdep_assert_rq_held kernel/sched/sched.h:1549 [inline]
       lockdep_assert_rq_held kernel/sched/sched.h:1547 [inline]
       update_rq_clock+0x34a/0xc70 kernel/sched/core.c:837
       pick_next_task kernel/sched/core.c:6088 [inline]
       __schedule+0x212d/0x6150 kernel/sched/core.c:6805
       __schedule_loop kernel/sched/core.c:6945 [inline]
       schedule+0xe7/0x3a0 kernel/sched/core.c:6960
       schedule_timeout+0x257/0x290 kernel/time/sleep_timeout.c:75
       do_wait_for_common kernel/sched/completion.c:100 [inline]
       __wait_for_common+0x2fc/0x4e0 kernel/sched/completion.c:121
       wait_for_ap_thread kernel/cpu.c:273 [inline]
       bringup_wait_for_ap_online kernel/cpu.c:799 [inline]
       cpuhp_bringup_ap+0xcb/0x1100 kernel/cpu.c:843
       cpuhp_invoke_callback+0x3d5/0xa10 kernel/cpu.c:195
       __cpuhp_invoke_callback_range+0x101/0x210 kernel/cpu.c:968
       cpuhp_invoke_callback_range kernel/cpu.c:992 [inline]
       cpuhp_up_callbacks kernel/cpu.c:1023 [inline]
       _cpu_up+0x3f5/0x960 kernel/cpu.c:1685
       cpu_up+0x1bf/0x240 kernel/cpu.c:1717
       cpu_subsys_online+0x84/0x190 drivers/base/cpu.c:61
       device_online+0x114/0x1c0 drivers/base/core.c:4225
       online_store+0x145/0x180 drivers/base/core.c:2809
       dev_attr_store+0x58/0x80 drivers/base/core.c:2437
       sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:142
       kernfs_fop_write_iter+0x3af/0x570 fs/kernfs/file.c:352
       do_iter_readv_writev+0x662/0x9e0 fs/read_write.c:827
       vfs_writev+0x35f/0xde0 fs/read_write.c:1057
       do_writev+0x132/0x340 fs/read_write.c:1103
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  console_owner --> &p->pi_lock --> &rq->__lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&rq->__lock);
                               lock(&p->pi_lock);
                               lock(&rq->__lock);
  lock(console_owner);

 *** DEADLOCK ***

12 locks held by syz.0.27/6024:
 #0: ffff88801fbb9b38 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x2a2/0x370 fs/file.c:1255
 #1: ffff88803529e420 (sb_writers#7){.+.+}-{0:0}, at: do_writev+0x132/0x340 fs/read_write.c:1103
 #2: ffff8880305a3c88 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x28f/0x570 fs/kernfs/file.c:343
 #3: ffff88801e2df698 (kn->active#60){.+.+}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:80 [inline]
 #3: ffff88801e2df698 (kn->active#60){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x2ff/0x570 fs/kernfs/file.c:344
 #4: ffffffff8f2ba148 (device_hotplug_lock){+.+.}-{4:4}, at: lock_device_hotplug_sysfs drivers/base/core.c:2355 [inline]
 #4: ffffffff8f2ba148 (device_hotplug_lock){+.+.}-{4:4}, at: online_store+0x9a/0x180 drivers/base/core.c:2805
 #5: ffff8880b8537490 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:895 [inline]
 #5: ffff8880b8537490 (&dev->mutex){....}-{4:4}, at: device_online+0x27/0x1c0 drivers/base/core.c:4222
 #6: ffffffff8e269f48 (cpu_add_remove_lock){+.+.}-{4:4}, at: cpu_maps_update_begin kernel/cpu.c:469 [inline]
 #6: ffffffff8e269f48 (cpu_add_remove_lock){+.+.}-{4:4}, at: cpu_up+0xbc/0x240 kernel/cpu.c:1706
 #7: ffffffff8e269e90 (cpu_hotplug_lock){++++}-{0:0}, at: cpus_write_lock kernel/cpu.c:509 [inline]
 #7: ffffffff8e269e90 (cpu_hotplug_lock){++++}-{0:0}, at: _cpu_up+0x68/0x960 kernel/cpu.c:1633
 #8: ffffffff8e3bd868 (sparse_irq_lock){+.+.}-{4:4}, at: cpuhp_bringup_ap+0x63/0x1100 kernel/cpu.c:837
 #9: ffff8880b843add8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:647 [inline]
 #9: ffff8880b843add8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x7e/0x130 kernel/sched/core.c:632
 #10: ffffffff8e3b6f00 (console_lock){+.+.}-{0:0}, at: _printk+0xc7/0x100 kernel/printk/printk.c:2451
 #11: ffffffff8e3b6f78 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:336 [inline]
 #11: ffffffff8e3b6f78 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:409 [inline]
 #11: ffffffff8e3b6f78 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:289 [inline]
 #11: ffffffff8e3b6f78 (console_srcu){....}-{0:0}, at: console_flush_one_record+0x103/0xc60 kernel/printk/printk.c:3192

stack backtrace:
CPU: 0 UID: 0 PID: 6024 Comm: syz.0.27 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_circular_bug+0x275/0x340 kernel/locking/lockdep.c:2043
 check_noncircular+0x146/0x160 kernel/locking/lockdep.c:2175
 check_prev_add kernel/locking/lockdep.c:3165 [inline]
 check_prevs_add kernel/locking/lockdep.c:3284 [inline]
 validate_chain kernel/locking/lockdep.c:3908 [inline]
 __lock_acquire+0x1669/0x2890 kernel/locking/lockdep.c:5237
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x179/0x330 kernel/locking/lockdep.c:5825
 console_lock_spinning_enable+0x72/0x80 kernel/printk/printk.c:1900
 console_emit_next_record kernel/printk/printk.c:3123 [inline]
 console_flush_one_record+0x73f/0xc60 kernel/printk/printk.c:3215
 console_flush_all kernel/printk/printk.c:3289 [inline]
 __console_flush_and_unlock kernel/printk/printk.c:3319 [inline]
 console_unlock+0xef/0x240 kernel/printk/printk.c:3359
 vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2426
 _printk+0xc7/0x100 kernel/printk/printk.c:2451
 __report_bug+0x3a6/0x520 lib/bug.c:243
 report_bug+0xb2/0x220 lib/bug.c:281
 handle_bug+0x127/0x260 arch/x86/kernel/traps.c:435
 exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:489
 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:616
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1549 [inline]
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1547 [inline]
RIP: 0010:update_rq_clock+0x34a/0xc70 kernel/sched/core.c:837
Code: ab 48 0b 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc a8 04 0f 84 9c fd ff ff 90 0f 0b 90 e9 93 fd ff ff 90 <0f> 0b 90 e9 4f fd ff ff 48 8d bb 18 0e 00 00 48 b8 00 00 00 00 00
RSP: 0018:ffffc900034a73c0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff8880b853adc0 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8daa4b08 RDI: ffffffff8bf2b600
RBP: 0000000000000001 R08: ffff8880b843b8c8 R09: fffffbfff2111dba
R10: ffffffff9088edd7 R11: 0000000000000001 R12: ffffffff90891e54
R13: ffffffff8dd654e0 R14: ffff88801dac1e80 R15: ffff8880b853adc0
 pick_next_task kernel/sched/core.c:6088 [inline]
 __schedule+0x212d/0x6150 kernel/sched/core.c:6805
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6960
 schedule_timeout+0x257/0x290 kernel/time/sleep_timeout.c:75
 do_wait_for_common kernel/sched/completion.c:100 [inline]
 __wait_for_common+0x2fc/0x4e0 kernel/sched/completion.c:121
 wait_for_ap_thread kernel/cpu.c:273 [inline]
 bringup_wait_for_ap_online kernel/cpu.c:799 [inline]
 cpuhp_bringup_ap+0xcb/0x1100 kernel/cpu.c:843
 cpuhp_invoke_callback+0x3d5/0xa10 kernel/cpu.c:195
 __cpuhp_invoke_callback_range+0x101/0x210 kernel/cpu.c:968
 cpuhp_invoke_callback_range kernel/cpu.c:992 [inline]
 cpuhp_up_callbacks kernel/cpu.c:1023 [inline]
 _cpu_up+0x3f5/0x960 kernel/cpu.c:1685
 cpu_up+0x1bf/0x240 kernel/cpu.c:1717
 cpu_subsys_online+0x84/0x190 drivers/base/cpu.c:61
 device_online+0x114/0x1c0 drivers/base/core.c:4225
 online_store+0x145/0x180 drivers/base/core.c:2809
 dev_attr_store+0x58/0x80 drivers/base/core.c:2437
 sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:142
 kernfs_fop_write_iter+0x3af/0x570 fs/kernfs/file.c:352
 do_iter_readv_writev+0x662/0x9e0 fs/read_write.c:827
 vfs_writev+0x35f/0xde0 fs/read_write.c:1057
 do_writev+0x132/0x340 fs/read_write.c:1103
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa8f778f7c9
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:00007fa8f6df6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007fa8f79e5fa0 RCX: 00007fa8f778f7c9
RDX: 0000000000000008 RSI: 0000200000000100 RDI: 0000000000000003
RBP: 00007fa8f7813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa8f79e6038 R14: 00007fa8f79e5fa0 R15: 00007ffd1ab524a8
 </TASK>
WARNING: kernel/sched/sched.h:1549 at lockdep_assert_rq_held kernel/sched/sched.h:1549 [inline], CPU#0: syz.0.27/6024
WARNING: kernel/sched/sched.h:1549 at lockdep_assert_rq_held kernel/sched/sched.h:1547 [inline], CPU#0: syz.0.27/6024
WARNING: kernel/sched/sched.h:1549 at update_rq_clock+0x34a/0xc70 kernel/sched/core.c:837, CPU#0: syz.0.27/6024
Modules linked in:
CPU: 0 UID: 0 PID: 6024 Comm: syz.0.27 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1549 [inline]
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1547 [inline]
RIP: 0010:update_rq_clock+0x34a/0xc70 kernel/sched/core.c:837
Code: ab 48 0b 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc a8 04 0f 84 9c fd ff ff 90 0f 0b 90 e9 93 fd ff ff 90 <0f> 0b 90 e9 4f fd ff ff 48 8d bb 18 0e 00 00 48 b8 00 00 00 00 00
RSP: 0018:ffffc900034a73c0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff8880b853adc0 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8daa4b08 RDI: ffffffff8bf2b600
RBP: 0000000000000001 R08: ffff8880b843b8c8 R09: fffffbfff2111dba
R10: ffffffff9088edd7 R11: 0000000000000001 R12: ffffffff90891e54
R13: ffffffff8dd654e0 R14: ffff88801dac1e80 R15: ffff8880b853adc0
FS:  00007fa8f6df66c0(0000) GS:ffff8881248fc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000729ae000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 pick_next_task kernel/sched/core.c:6088 [inline]
 __schedule+0x212d/0x6150 kernel/sched/core.c:6805
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6960
 schedule_timeout+0x257/0x290 kernel/time/sleep_timeout.c:75
 do_wait_for_common kernel/sched/completion.c:100 [inline]
 __wait_for_common+0x2fc/0x4e0 kernel/sched/completion.c:121
 wait_for_ap_thread kernel/cpu.c:273 [inline]
 bringup_wait_for_ap_online kernel/cpu.c:799 [inline]
 cpuhp_bringup_ap+0xcb/0x1100 kernel/cpu.c:843
 cpuhp_invoke_callback+0x3d5/0xa10 kernel/cpu.c:195
 __cpuhp_invoke_callback_range+0x101/0x210 kernel/cpu.c:968
 cpuhp_invoke_callback_range kernel/cpu.c:992 [inline]
 cpuhp_up_callbacks kernel/cpu.c:1023 [inline]
 _cpu_up+0x3f5/0x960 kernel/cpu.c:1685
 cpu_up+0x1bf/0x240 kernel/cpu.c:1717
 cpu_subsys_online+0x84/0x190 drivers/base/cpu.c:61
 device_online+0x114/0x1c0 drivers/base/core.c:4225
 online_store+0x145/0x180 drivers/base/core.c:2809
 dev_attr_store+0x58/0x80 drivers/base/core.c:2437
 sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:142
 kernfs_fop_write_iter+0x3af/0x570 fs/kernfs/file.c:352
 do_iter_readv_writev+0x662/0x9e0 fs/read_write.c:827
 vfs_writev+0x35f/0xde0 fs/read_write.c:1057
 do_writev+0x132/0x340 fs/read_write.c:1103
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa8f778f7c9
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:00007fa8f6df6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007fa8f79e5fa0 RCX: 00007fa8f778f7c9
RDX: 0000000000000008 RSI: 0000200000000100 RDI: 0000000000000003
RBP: 00007fa8f7813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa8f79e6038 R14: 00007fa8f79e5fa0 R15: 00007ffd1ab524a8
 </TASK>