------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.799/9580 is trying to acquire lock:
ffffffff8e4eef60 (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:1580 [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+0x285/0x600 kernel/cgroup/cgroup.c:948
       cgroup_post_fork+0x1fe/0x9b0 kernel/cgroup/cgroup.c:6910
       copy_process+0x57b0/0x7890 kernel/fork.c:2465
       kernel_clone+0xfc/0x930 kernel/fork.c:2651
       user_mode_thread+0xcc/0x110 kernel/fork.c:2727
       rest_init+0x21/0x260 init/main.c:722
       start_kernel+0x47a/0x480 init/main.c:1206
       x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
       x86_64_start_kernel+0x122/0x130 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+0xb2/0x1a60 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+0x47/0x60 drivers/tty/tty_port.c:67
       serial8250_tx_chars+0x68f/0x860 drivers/tty/serial/8250/8250_port.c:1719
       serial8250_handle_irq+0x73e/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+0x232/0x800 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+0x375/0x970 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+0xd8/0x2f0 arch/x86/kernel/irq.c:326
       common_interrupt+0xb9/0xe0 arch/x86/kernel/irq.c:319
       asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688
       stack_access_ok+0xc/0x1d0 arch/x86/kernel/unwind_orc.c:405
       deref_stack_reg arch/x86/kernel/unwind_orc.c:419 [inline]
       unwind_next_frame+0xb0b/0x1ea0 arch/x86/kernel/unwind_orc.c:600
       arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
       stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
       save_stack+0x162/0x1e0 mm/page_owner.c:165
       __set_page_owner+0x8c/0x540 mm/page_owner.c:341
       set_page_owner include/linux/page_owner.h:32 [inline]
       post_alloc_hook+0x1e1/0x250 mm/page_alloc.c:1884
       prep_new_page mm/page_alloc.c:1892 [inline]
       get_page_from_freelist+0xe3d/0x2e10 mm/page_alloc.c:3945
       __alloc_frozen_pages_noprof+0x26c/0x2410 mm/page_alloc.c:5240
       alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2486
       folio_alloc_mpol_noprof+0x36/0x340 mm/mempolicy.c:2505
       vma_alloc_folio_noprof+0xed/0x1d0 mm/mempolicy.c:2540
       folio_prealloc mm/memory.c:1193 [inline]
       wp_page_copy mm/memory.c:3722 [inline]
       do_wp_page+0x1eb4/0x4c10 mm/memory.c:4183
       handle_pte_fault mm/memory.c:6292 [inline]
       __handle_mm_fault+0x1ac0/0x2b50 mm/memory.c:6414
       handle_mm_fault+0x36d/0xa20 mm/memory.c:6583
       do_user_addr_fault+0x5a3/0x12f0 arch/x86/mm/fault.c:1334
       handle_page_fault arch/x86/mm/fault.c:1474 [inline]
       exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1527
       asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618

-> #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+0x47/0x60 drivers/tty/tty_port.c:67
       serial8250_tx_chars+0x68f/0x860 drivers/tty/serial/8250/8250_port.c:1719
       serial8250_handle_irq+0x73e/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+0x232/0x800 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+0x375/0x970 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+0xd8/0x2f0 arch/x86/kernel/irq.c:326
       common_interrupt+0xb9/0xe0 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+0x9/0x10 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+0x35b/0x4b0 kernel/sched/idle.c:332
       cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:430
       rest_init+0x251/0x260 init/main.c:757
       start_kernel+0x47a/0x480 init/main.c:1206
       x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
       x86_64_start_kernel+0x122/0x130 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+0x17e/0x1900 drivers/tty/serial/8250/8250_port.c:3301
       console_emit_next_record kernel/printk/printk.c:3129 [inline]
       console_flush_one_record+0x790/0xe50 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+0x103/0x260 kernel/printk/printk.c:3359
       vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2426
       _printk+0xcf/0x110 kernel/printk/printk.c:2451
       register_console.cold+0xc0/0x248 kernel/printk/printk.c:4170
       univ8250_console_init+0x6f/0x80 drivers/tty/serial/8250/8250_core.c:515
       console_init+0x371/0x520 kernel/printk/printk.c:4369
       start_kernel+0x300/0x480 init/main.c:1143
       x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
       x86_64_start_kernel+0x122/0x130 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+0x14b8/0x2630 kernel/locking/lockdep.c:5237
       lock_acquire kernel/locking/lockdep.c:5868 [inline]
       lock_acquire+0x17c/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+0x739/0xe50 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+0x103/0x260 kernel/printk/printk.c:3359
       vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2426
       _printk+0xcf/0x110 kernel/printk/printk.c:2451
       __report_bug.cold+0x15/0x137 lib/bug.c:243
       report_bug+0xb2/0x220 lib/bug.c:281
       handle_bug+0x166/0x2a0 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:1571 [inline]
       lockdep_assert_rq_held kernel/sched/sched.h:1569 [inline]
       update_rq_clock+0x34a/0xd30 kernel/sched/core.c:837
       pick_next_task kernel/sched/core.c:6092 [inline]
       __schedule+0x1b0d/0x5e10 kernel/sched/core.c:6809
       preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7194
       irqentry_exit+0x17b/0x670 kernel/entry/common.c:216
       asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
       bytes_is_nonzero mm/kasan/generic.c:98 [inline]
       memory_is_nonzero mm/kasan/generic.c:115 [inline]
       memory_is_poisoned_n mm/kasan/generic.c:140 [inline]
       memory_is_poisoned mm/kasan/generic.c:172 [inline]
       check_region_inline mm/kasan/generic.c:191 [inline]
       kasan_check_range+0x180/0x1e0 mm/kasan/generic.c:200
       __asan_memset+0x23/0x50 mm/kasan/shadow.c:84
       __unwind_start+0x2e/0x7f0 arch/x86/kernel/unwind_orc.c:701
       unwind_start arch/x86/include/asm/unwind.h:64 [inline]
       arch_stack_walk+0x73/0xf0 arch/x86/kernel/stacktrace.c:24
       stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
       save_stack+0x162/0x1e0 mm/page_owner.c:165
       __reset_page_owner+0x84/0x190 mm/page_owner.c:320
       reset_page_owner include/linux/page_owner.h:25 [inline]
       free_pages_prepare mm/page_alloc.c:1433 [inline]
       free_unref_folios+0xb2a/0x1760 mm/page_alloc.c:3030
       folios_put_refs+0x53c/0x840 mm/swap.c:1002
       folio_batch_release include/linux/pagevec.h:101 [inline]
       shmem_undo_range+0x5d8/0x14b0 mm/shmem.c:1137
       shmem_truncate_range mm/shmem.c:1249 [inline]
       shmem_evict_inode+0x39e/0xbd0 mm/shmem.c:1379
       evict+0x3c2/0xad0 fs/inode.c:837
       iput_final fs/inode.c:1954 [inline]
       iput.part.0+0x624/0x1150 fs/inode.c:2006
       iput+0x35/0x40 fs/inode.c:1969
       dentry_unlink_inode+0x2a1/0x490 fs/dcache.c:467
       __dentry_kill+0x1d0/0x600 fs/dcache.c:670
       finish_dput+0x76/0x480 fs/dcache.c:879
       dput.part.0+0x456/0x570 fs/dcache.c:928
       dput+0x1f/0x30 fs/dcache.c:920
       __fput+0x519/0xb40 fs/file_table.c:476
       task_work_run+0x150/0x240 kernel/task_work.c:233
       exit_task_work include/linux/task_work.h:40 [inline]
       do_exit+0x829/0x2a30 kernel/exit.c:971
       do_group_exit+0xd5/0x2a0 kernel/exit.c:1112
       get_signal+0x1ec7/0x21e0 kernel/signal.c:3034
       arch_do_signal_or_restart+0x91/0x770 arch/x86/kernel/signal.c:337
       __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
       exit_to_user_mode_loop+0x86/0x4b0 kernel/entry/common.c:75
       __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
       syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
       syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
       syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
       do_syscall_64+0x4ea/0xf80 arch/x86/entry/syscall_64.c:100
       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 ***

3 locks held by syz.0.799/9580:
 #0: ffff8880b843add8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:647 [inline]
 #0: ffff8880b843add8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x7e/0x130 kernel/sched/core.c:632
 #1: ffffffff8e5cf3a0 (console_lock){+.+.}-{0:0}, at: _printk+0xcf/0x110 kernel/printk/printk.c:2451
 #2: ffffffff8e5cf418 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:336 [inline]
 #2: ffffffff8e5cf418 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:409 [inline]
 #2: ffffffff8e5cf418 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:289 [inline]
 #2: ffffffff8e5cf418 (console_srcu){....}-{0:0}, at: console_flush_one_record+0xfd/0xe50 kernel/printk/printk.c:3192

stack backtrace:
CPU: 0 UID: 0 PID: 9580 Comm: syz.0.799 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_circular_bug.cold+0x178/0x1c7 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+0x14b8/0x2630 kernel/locking/lockdep.c:5237
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x17c/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+0x739/0xe50 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+0x103/0x260 kernel/printk/printk.c:3359
 vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2426
 _printk+0xcf/0x110 kernel/printk/printk.c:2451
 __report_bug.cold+0x15/0x137 lib/bug.c:243
 report_bug+0xb2/0x220 lib/bug.c:281
 handle_bug+0x166/0x2a0 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:1571 [inline]
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1569 [inline]
RIP: 0010:update_rq_clock+0x34a/0xd30 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 e9 c8 eb a2 09 a8 04 0f 84 9e fd ff ff 90 0f 0b 90 e9 95 fd ff ff 90 <0f> 0b 90 e9 51 fd ff ff 48 8d bb 18 0e 00 00 48 b8 00 00 00 00 00
RSP: 0018:ffffc900050b6c40 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff8880b853adc0 RCX: 0000000000000001
RDX: 0000000000000046 RSI: ffffffff8dc1b2ac RDI: ffffffff8bfa32a0
RBP: ffffc900050b6de8 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90b75dd7 R11: 0000000000000000 R12: ffffffff90b78e54
R13: ffff8880b853bbf0 R14: ffff88801dedbd00 R15: ffff8880b853adc0
 pick_next_task kernel/sched/core.c:6092 [inline]
 __schedule+0x1b0d/0x5e10 kernel/sched/core.c:6809
 preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7194
 irqentry_exit+0x17b/0x670 kernel/entry/common.c:216
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:98 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:115 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:140 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:172 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:191 [inline]
RIP: 0010:kasan_check_range+0x180/0x1e0 mm/kasan/generic.c:200
Code: ff ff ff 48 85 d2 74 98 48 01 ea eb 1a 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 83 c0 01 48 39 d0 0f 84 79 ff ff ff 80 38 00 <74> ee e9 57 ff ff ff b8 01 00 00 00 e9 7f 70 07 09 48 29 c3 48 89
RSP: 0018:ffffc900050b6ef0 EFLAGS: 00000246
RAX: fffff52000a16df0 RBX: fffff52000a16dfc RCX: ffffffff81b65eae
RDX: fffff52000a16dfc RSI: 0000000000000060 RDI: ffffc900050b6f80
RBP: fffff52000a16df0 R08: 0000000000000001 R09: fffff52000a16dfb
R10: ffffc900050b6fdf R11: 0000000000000000 R12: 0000000000000000
R13: ffffc900050b7040 R14: ffffc900050b6f80 R15: ffffc900050b6fa8
 __asan_memset+0x23/0x50 mm/kasan/shadow.c:84
 __unwind_start+0x2e/0x7f0 arch/x86/kernel/unwind_orc.c:701
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0x73/0xf0 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
 save_stack+0x162/0x1e0 mm/page_owner.c:165
 __reset_page_owner+0x84/0x190 mm/page_owner.c:320
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1433 [inline]
 free_unref_folios+0xb2a/0x1760 mm/page_alloc.c:3030
 folios_put_refs+0x53c/0x840 mm/swap.c:1002
 folio_batch_release include/linux/pagevec.h:101 [inline]
 shmem_undo_range+0x5d8/0x14b0 mm/shmem.c:1137
 shmem_truncate_range mm/shmem.c:1249 [inline]
 shmem_evict_inode+0x39e/0xbd0 mm/shmem.c:1379
 evict+0x3c2/0xad0 fs/inode.c:837
 iput_final fs/inode.c:1954 [inline]
 iput.part.0+0x624/0x1150 fs/inode.c:2006
 iput+0x35/0x40 fs/inode.c:1969
 dentry_unlink_inode+0x2a1/0x490 fs/dcache.c:467
 __dentry_kill+0x1d0/0x600 fs/dcache.c:670
 finish_dput+0x76/0x480 fs/dcache.c:879
 dput.part.0+0x456/0x570 fs/dcache.c:928
 dput+0x1f/0x30 fs/dcache.c:920
 __fput+0x519/0xb40 fs/file_table.c:476
 task_work_run+0x150/0x240 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x829/0x2a30 kernel/exit.c:971
 do_group_exit+0xd5/0x2a0 kernel/exit.c:1112
 get_signal+0x1ec7/0x21e0 kernel/signal.c:3034
 arch_do_signal_or_restart+0x91/0x770 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x86/0x4b0 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x4ea/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff5ff19acb9
Code: Unable to access opcode bytes at 0x7ff5ff19ac8f.
RSP: 002b:00007ff60001c028 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: fffffffffffffffc RBX: 00007ff5ff416090 RCX: 00007ff5ff19acb9
RDX: 0000000000000017 RSI: ffffffffffff0005 RDI: 0000000000000000
RBP: 00007ff5ff208bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff5ff416128 R14: 00007ff5ff416090 R15: 00007ffda687b578
 </TASK>
debug_locks && !(lock_is_held(&(__rq_lockp(rq))->dep_map) != 0)
WARNING: kernel/sched/sched.h:1571 at lockdep_assert_rq_held kernel/sched/sched.h:1571 [inline], CPU#0: syz.0.799/9580
WARNING: kernel/sched/sched.h:1571 at lockdep_assert_rq_held kernel/sched/sched.h:1569 [inline], CPU#0: syz.0.799/9580
WARNING: kernel/sched/sched.h:1571 at update_rq_clock+0x34a/0xd30 kernel/sched/core.c:837, CPU#0: syz.0.799/9580
Modules linked in:
CPU: 0 UID: 0 PID: 9580 Comm: syz.0.799 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1571 [inline]
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1569 [inline]
RIP: 0010:update_rq_clock+0x34a/0xd30 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 e9 c8 eb a2 09 a8 04 0f 84 9e fd ff ff 90 0f 0b 90 e9 95 fd ff ff 90 <0f> 0b 90 e9 51 fd ff ff 48 8d bb 18 0e 00 00 48 b8 00 00 00 00 00
RSP: 0018:ffffc900050b6c40 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff8880b853adc0 RCX: 0000000000000001
RDX: 0000000000000046 RSI: ffffffff8dc1b2ac RDI: ffffffff8bfa32a0
RBP: ffffc900050b6de8 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90b75dd7 R11: 0000000000000000 R12: ffffffff90b78e54
R13: ffff8880b853bbf0 R14: ffff88801dedbd00 R15: ffff8880b853adc0
FS:  0000000000000000(0000) GS:ffff8881245e5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f090f860a10 CR3: 0000000065170000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 pick_next_task kernel/sched/core.c:6092 [inline]
 __schedule+0x1b0d/0x5e10 kernel/sched/core.c:6809
 preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7194
 irqentry_exit+0x17b/0x670 kernel/entry/common.c:216
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:98 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:115 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:140 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:172 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:191 [inline]
RIP: 0010:kasan_check_range+0x180/0x1e0 mm/kasan/generic.c:200
Code: ff ff ff 48 85 d2 74 98 48 01 ea eb 1a 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 83 c0 01 48 39 d0 0f 84 79 ff ff ff 80 38 00 <74> ee e9 57 ff ff ff b8 01 00 00 00 e9 7f 70 07 09 48 29 c3 48 89
RSP: 0018:ffffc900050b6ef0 EFLAGS: 00000246
RAX: fffff52000a16df0 RBX: fffff52000a16dfc RCX: ffffffff81b65eae
RDX: fffff52000a16dfc RSI: 0000000000000060 RDI: ffffc900050b6f80
RBP: fffff52000a16df0 R08: 0000000000000001 R09: fffff52000a16dfb
R10: ffffc900050b6fdf R11: 0000000000000000 R12: 0000000000000000
R13: ffffc900050b7040 R14: ffffc900050b6f80 R15: ffffc900050b6fa8
 __asan_memset+0x23/0x50 mm/kasan/shadow.c:84
 __unwind_start+0x2e/0x7f0 arch/x86/kernel/unwind_orc.c:701
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0x73/0xf0 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
 save_stack+0x162/0x1e0 mm/page_owner.c:165
 __reset_page_owner+0x84/0x190 mm/page_owner.c:320
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1433 [inline]
 free_unref_folios+0xb2a/0x1760 mm/page_alloc.c:3030
 folios_put_refs+0x53c/0x840 mm/swap.c:1002
 folio_batch_release include/linux/pagevec.h:101 [inline]
 shmem_undo_range+0x5d8/0x14b0 mm/shmem.c:1137
 shmem_truncate_range mm/shmem.c:1249 [inline]
 shmem_evict_inode+0x39e/0xbd0 mm/shmem.c:1379
 evict+0x3c2/0xad0 fs/inode.c:837
 iput_final fs/inode.c:1954 [inline]
 iput.part.0+0x624/0x1150 fs/inode.c:2006
 iput+0x35/0x40 fs/inode.c:1969
 dentry_unlink_inode+0x2a1/0x490 fs/dcache.c:467
 __dentry_kill+0x1d0/0x600 fs/dcache.c:670
 finish_dput+0x76/0x480 fs/dcache.c:879
 dput.part.0+0x456/0x570 fs/dcache.c:928
 dput+0x1f/0x30 fs/dcache.c:920
 __fput+0x519/0xb40 fs/file_table.c:476
 task_work_run+0x150/0x240 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x829/0x2a30 kernel/exit.c:971
 do_group_exit+0xd5/0x2a0 kernel/exit.c:1112
 get_signal+0x1ec7/0x21e0 kernel/signal.c:3034
 arch_do_signal_or_restart+0x91/0x770 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x86/0x4b0 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x4ea/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff5ff19acb9
Code: Unable to access opcode bytes at 0x7ff5ff19ac8f.
RSP: 002b:00007ff60001c028 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: fffffffffffffffc RBX: 00007ff5ff416090 RCX: 00007ff5ff19acb9
RDX: 0000000000000017 RSI: ffffffffffff0005 RDI: 0000000000000000
RBP: 00007ff5ff208bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff5ff416128 R14: 00007ff5ff416090 R15: 00007ffda687b578
 </TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	ff 48 85             	decl   -0x7b(%rax)
   3:	d2 74 98 48          	shlb   %cl,0x48(%rax,%rbx,4)
   7:	01 ea                	add    %ebp,%edx
   9:	eb 1a                	jmp    0x25
   b:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
  12:	00 00 00 00
  16:	66 90                	xchg   %ax,%ax
  18:	48 83 c0 01          	add    $0x1,%rax
  1c:	48 39 d0             	cmp    %rdx,%rax
  1f:	0f 84 79 ff ff ff    	je     0xffffff9e
  25:	80 38 00             	cmpb   $0x0,(%rax)
* 28:	74 ee                	je     0x18 <-- trapping instruction
  2a:	e9 57 ff ff ff       	jmp    0xffffff86
  2f:	b8 01 00 00 00       	mov    $0x1,%eax
  34:	e9 7f 70 07 09       	jmp    0x90770b8
  39:	48 29 c3             	sub    %rax,%rbx
  3c:	48                   	rex.W
  3d:	89                   	.byte 0x89