------------[ cut here ]------------ ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.2.14/6025 is trying to acquire lock: ffffffff8e2d6a40 (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: -> #5 (&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+0x288/0x5f0 kernel/cgroup/cgroup.c:948 cgroup_post_fork+0x201/0x9e0 kernel/cgroup/cgroup.c:6910 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 -> #4 (&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 create_worker+0x339/0x7e0 kernel/workqueue.c:2828 workqueue_init+0x4e5/0xbe0 kernel/workqueue.c:7958 kernel_init_freeable+0x332/0x920 init/main.c:1673 kernel_init+0x1c/0x2b0 init/main.c:1578 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 -> #3 (&pool->lock){-.-.}-{2:2}: __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 __queue_work+0x26b/0x10e0 kernel/workqueue.c:2295 queue_work_on+0x15f/0x1f0 kernel/workqueue.c:2386 queue_work include/linux/workqueue.h:669 [inline] rpm_suspend+0xe8f/0x11b0 drivers/base/power/runtime.c:688 rpm_idle+0x5dc/0x760 drivers/base/power/runtime.c:562 __pm_runtime_idle+0xba/0x1a0 drivers/base/power/runtime.c:1129 pm_runtime_put include/linux/pm_runtime.h:563 [inline] __device_attach+0x37e/0x4e0 drivers/base/dd.c:1049 device_initial_probe+0xaa/0xc0 drivers/base/dd.c:1086 bus_probe_device+0x64/0x150 drivers/base/bus.c:574 device_add+0x116e/0x1980 drivers/base/core.c:3689 serial_base_port_add+0x227/0x2b0 drivers/tty/serial/serial_base_bus.c:186 serial_core_port_device_add drivers/tty/serial/serial_core.c:3252 [inline] serial_core_register_port+0x13c/0x25d0 drivers/tty/serial/serial_core.c:3291 serial8250_register_8250_port+0x155a/0x2380 drivers/tty/serial/8250/8250_core.c:822 serial_pnp_probe+0x431/0x930 drivers/tty/serial/8250/8250_pnp.c:480 pnp_device_probe+0x2a8/0x4d0 drivers/pnp/driver.c:111 call_driver_probe drivers/base/dd.c:581 [inline] really_probe+0x241/0xb20 drivers/base/dd.c:659 __driver_probe_device+0x1de/0x470 drivers/base/dd.c:801 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831 __driver_attach+0x283/0x5e0 drivers/base/dd.c:1225 bus_for_each_dev+0x13e/0x1d0 drivers/base/bus.c:383 bus_add_driver+0x30f/0x6c0 drivers/base/bus.c:715 driver_register+0x15c/0x4b0 drivers/base/driver.c:249 serial8250_init+0xca/0x1e0 drivers/tty/serial/8250/8250_platform.c:317 do_one_initcall+0x123/0x680 init/main.c:1378 do_initcall_level init/main.c:1440 [inline] do_initcalls init/main.c:1456 [inline] do_basic_setup init/main.c:1475 [inline] kernel_init_freeable+0x5c8/0x920 init/main.c:1688 kernel_init+0x1c/0x2b0 init/main.c:1578 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 -> #2 (&dev->power.lock){-.-.}-{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 __pm_runtime_resume+0xa9/0x170 drivers/base/power/runtime.c:1196 pm_runtime_get include/linux/pm_runtime.h:494 [inline] __uart_start+0x1b0/0x500 drivers/tty/serial/serial_core.c:149 uart_write+0x218/0xb30 drivers/tty/serial/serial_core.c:633 process_output_block drivers/tty/n_tty.c:557 [inline] n_tty_write+0x434/0x1280 drivers/tty/n_tty.c:2366 iterate_tty_write drivers/tty/tty_io.c:1006 [inline] file_tty_write.constprop.0+0x503/0x9b0 drivers/tty/tty_io.c:1081 tty_write drivers/tty/tty_io.c:1102 [inline] redirected_tty_write drivers/tty/tty_io.c:1125 [inline] redirected_tty_write+0xd4/0x120 drivers/tty/tty_io.c:1105 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x7d3/0x11d0 fs/read_write.c:686 ksys_write+0x12a/0x250 fs/read_write.c:738 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 -> #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:1571 [inline] lockdep_assert_rq_held kernel/sched/sched.h:1569 [inline] update_rq_clock+0x34a/0xc70 kernel/sched/core.c:837 pick_next_task kernel/sched/core.c:6092 [inline] __schedule+0x20fd/0x5ee0 kernel/sched/core.c:6809 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7194 irqentry_exit+0x1d8/0x8c0 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 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 save_stack+0x160/0x1f0 mm/page_owner.c:165 __set_page_owner+0x91/0x560 mm/page_owner.c:341 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1af/0x220 mm/page_alloc.c:1884 prep_new_page mm/page_alloc.c:1892 [inline] get_page_from_freelist+0xd0b/0x31a0 mm/page_alloc.c:3945 __alloc_frozen_pages_noprof+0x25f/0x2430 mm/page_alloc.c:5240 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2486 folio_alloc_mpol_noprof+0x36/0x2f0 mm/mempolicy.c:2505 shmem_alloc_folio+0x135/0x160 mm/shmem.c:1890 shmem_alloc_and_add_folio+0x494/0xc20 mm/shmem.c:1932 shmem_get_folio_gfp+0x67f/0x1610 mm/shmem.c:2556 shmem_get_folio mm/shmem.c:2662 [inline] shmem_write_begin+0x1a4/0x3b0 mm/shmem.c:3315 generic_perform_write+0x3c4/0x900 mm/filemap.c:4314 shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3490 __kernel_write_iter+0x31a/0xb10 fs/read_write.c:619 dump_emit_page fs/coredump.c:1298 [inline] dump_user_range+0x413/0xb70 fs/coredump.c:1372 elf_core_dump+0x29c3/0x3c10 fs/binfmt_elf.c:2111 coredump_write fs/coredump.c:1049 [inline] do_coredump fs/coredump.c:1126 [inline] vfs_coredump+0x2b85/0x55e0 fs/coredump.c:1200 get_signal+0x22e1/0x26d0 kernel/signal.c:3019 arch_do_signal_or_restart+0x8f/0x7a0 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline] exit_to_user_mode_loop kernel/entry/common.c:75 [inline] __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline] irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline] irqentry_exit+0x38a/0x8c0 kernel/entry/common.c:196 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 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 *** 6 locks held by syz.2.14/6025: #0: ffff888030d06420 (sb_writers#5){.+.+}-{0:0}, at: get_signal+0x22e1/0x26d0 kernel/signal.c:3019 #1: ffff8880307ec9f0 (&sb->s_type->i_mutex_key#15){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1027 [inline] #1: ffff8880307ec9f0 (&sb->s_type->i_mutex_key#15){+.+.}-{4:4}, at: shmem_file_write_iter+0x86/0x140 mm/shmem.c:3480 #2: ffffffff8e3c94a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #2: ffffffff8e3c94a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline] #2: ffffffff8e3c94a0 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1195 [inline] #2: ffffffff8e3c94a0 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xbd/0x20b0 arch/x86/kernel/unwind_orc.c:495 #3: ffff8880b843add8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:647 [inline] #3: ffff8880b843add8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x7e/0x130 kernel/sched/core.c:632 #4: ffffffff8e3b6e80 (console_lock){+.+.}-{0:0}, at: _printk+0xc7/0x100 kernel/printk/printk.c:2451 #5: ffffffff8e3b6ef8 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:336 [inline] #5: ffffffff8e3b6ef8 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:409 [inline] #5: ffffffff8e3b6ef8 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:289 [inline] #5: ffffffff8e3b6ef8 (console_srcu){....}-{0:0}, at: console_flush_one_record+0x103/0xc60 kernel/printk/printk.c:3192 stack backtrace: CPU: 0 UID: 0 PID: 6025 Comm: syz.2.14 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026 Call Trace: __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:1571 [inline] RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1569 [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 e9 18 6c ee 09 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:ffffc900058ee0a8 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff8880b853adc0 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8daa5ea0 RDI: ffffffff8bf2b600 RBP: 0000000000000001 R08: ffff8880b843b8c8 R09: fffffbfff211205a R10: ffffffff908902d7 R11: 0000000000000001 R12: ffffffff90893354 R13: ffffffff8dd66a60 R14: ffff8880252bdb80 R15: ffff8880b853adc0 pick_next_task kernel/sched/core.c:6092 [inline] __schedule+0x20fd/0x5ee0 kernel/sched/core.c:6809 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7194 irqentry_exit+0x1d8/0x8c0 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 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:114 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:128 [inline] RIP: 0010:lock_release+0x8f/0x2d0 kernel/locking/lockdep.c:5885 Code: 01 00 00 65 4c 8b 35 48 0d 19 12 41 8b b6 2c 0b 00 00 85 f6 0f 85 ff 00 00 00 48 81 3b 00 76 b9 93 0f 84 f2 00 00 00 9c 41 5d 48 c7 c7 57 c4 bb 8d e8 74 bc dc 09 65 ff 05 45 54 19 12 8b 0d RSP: 0018:ffffc900058ee360 EFLAGS: 00000206 RAX: 0000000000000000 RBX: ffffffff8e3c94a0 RCX: ffffc900058f0001 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000001 R08: 0000000000000001 R09: 000000003bdb8de7 R10: 0000000000000002 R11: 0000000000015b83 R12: ffffffff816c8a34 R13: 0000000000000206 R14: ffff88802e69bd00 R15: ffffc900058ee44c 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 save_stack+0x160/0x1f0 mm/page_owner.c:165 __set_page_owner+0x91/0x560 mm/page_owner.c:341 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1af/0x220 mm/page_alloc.c:1884 prep_new_page mm/page_alloc.c:1892 [inline] get_page_from_freelist+0xd0b/0x31a0 mm/page_alloc.c:3945 __alloc_frozen_pages_noprof+0x25f/0x2430 mm/page_alloc.c:5240 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2486 folio_alloc_mpol_noprof+0x36/0x2f0 mm/mempolicy.c:2505 shmem_alloc_folio+0x135/0x160 mm/shmem.c:1890 shmem_alloc_and_add_folio+0x494/0xc20 mm/shmem.c:1932 shmem_get_folio_gfp+0x67f/0x1610 mm/shmem.c:2556 shmem_get_folio mm/shmem.c:2662 [inline] shmem_write_begin+0x1a4/0x3b0 mm/shmem.c:3315 generic_perform_write+0x3c4/0x900 mm/filemap.c:4314 shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3490 __kernel_write_iter+0x31a/0xb10 fs/read_write.c:619 dump_emit_page fs/coredump.c:1298 [inline] dump_user_range+0x413/0xb70 fs/coredump.c:1372 elf_core_dump+0x29c3/0x3c10 fs/binfmt_elf.c:2111 coredump_write fs/coredump.c:1049 [inline] do_coredump fs/coredump.c:1126 [inline] vfs_coredump+0x2b85/0x55e0 fs/coredump.c:1200 get_signal+0x22e1/0x26d0 kernel/signal.c:3019 arch_do_signal_or_restart+0x8f/0x7a0 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline] exit_to_user_mode_loop kernel/entry/common.c:75 [inline] __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline] irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline] irqentry_exit+0x38a/0x8c0 kernel/entry/common.c:196 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0033:0x7f3c2098f7d1 Code: 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 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f RSP: 002b:fffffffffffffffa EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f3c20be6270 RCX: 00007f3c2098f7c9 RDX: ffffffffffffffff RSI: fffffffffffffffa RDI: 0000000000008ffe RBP: 00007f3c20a13f91 R08: 0000000000000008 R09: 0000000000000000 R10: ffffffffff600000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3c20be6308 R14: 00007f3c20be6270 R15: 00007ffc401ad1a8 WARNING: kernel/sched/sched.h:1571 at lockdep_assert_rq_held kernel/sched/sched.h:1571 [inline], CPU#0: syz.2.14/6025 WARNING: kernel/sched/sched.h:1571 at lockdep_assert_rq_held kernel/sched/sched.h:1569 [inline], CPU#0: syz.2.14/6025 WARNING: kernel/sched/sched.h:1571 at update_rq_clock+0x34a/0xc70 kernel/sched/core.c:837, CPU#0: syz.2.14/6025 Modules linked in: CPU: 0 UID: 0 PID: 6025 Comm: syz.2.14 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/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 e9 18 6c ee 09 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:ffffc900058ee0a8 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff8880b853adc0 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8daa5ea0 RDI: ffffffff8bf2b600 RBP: 0000000000000001 R08: ffff8880b843b8c8 R09: fffffbfff211205a R10: ffffffff908902d7 R11: 0000000000000001 R12: ffffffff90893354 R13: ffffffff8dd66a60 R14: ffff8880252bdb80 R15: ffff8880b853adc0 FS: 00007f3c218326c0(0000) GS:ffff8881248f6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000008 CR3: 00000000787fc000 CR4: 00000000003526f0 Call Trace: pick_next_task kernel/sched/core.c:6092 [inline] __schedule+0x20fd/0x5ee0 kernel/sched/core.c:6809 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7194 irqentry_exit+0x1d8/0x8c0 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 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:114 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:128 [inline] RIP: 0010:lock_release+0x8f/0x2d0 kernel/locking/lockdep.c:5885 Code: 01 00 00 65 4c 8b 35 48 0d 19 12 41 8b b6 2c 0b 00 00 85 f6 0f 85 ff 00 00 00 48 81 3b 00 76 b9 93 0f 84 f2 00 00 00 9c 41 5d 48 c7 c7 57 c4 bb 8d e8 74 bc dc 09 65 ff 05 45 54 19 12 8b 0d RSP: 0018:ffffc900058ee360 EFLAGS: 00000206 RAX: 0000000000000000 RBX: ffffffff8e3c94a0 RCX: ffffc900058f0001 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000001 R08: 0000000000000001 R09: 000000003bdb8de7 R10: 0000000000000002 R11: 0000000000015b83 R12: ffffffff816c8a34 R13: 0000000000000206 R14: ffff88802e69bd00 R15: ffffc900058ee44c 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 save_stack+0x160/0x1f0 mm/page_owner.c:165 __set_page_owner+0x91/0x560 mm/page_owner.c:341 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1af/0x220 mm/page_alloc.c:1884 prep_new_page mm/page_alloc.c:1892 [inline] get_page_from_freelist+0xd0b/0x31a0 mm/page_alloc.c:3945 __alloc_frozen_pages_noprof+0x25f/0x2430 mm/page_alloc.c:5240 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2486 folio_alloc_mpol_noprof+0x36/0x2f0 mm/mempolicy.c:2505 shmem_alloc_folio+0x135/0x160 mm/shmem.c:1890 shmem_alloc_and_add_folio+0x494/0xc20 mm/shmem.c:1932 shmem_get_folio_gfp+0x67f/0x1610 mm/shmem.c:2556 shmem_get_folio mm/shmem.c:2662 [inline] shmem_write_begin+0x1a4/0x3b0 mm/shmem.c:3315 generic_perform_write+0x3c4/0x900 mm/filemap.c:4314 shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3490 __kernel_write_iter+0x31a/0xb10 fs/read_write.c:619 dump_emit_page fs/coredump.c:1298 [inline] dump_user_range+0x413/0xb70 fs/coredump.c:1372 elf_core_dump+0x29c3/0x3c10 fs/binfmt_elf.c:2111 coredump_write fs/coredump.c:1049 [inline] do_coredump fs/coredump.c:1126 [inline] vfs_coredump+0x2b85/0x55e0 fs/coredump.c:1200 get_signal+0x22e1/0x26d0 kernel/signal.c:3019 arch_do_signal_or_restart+0x8f/0x7a0 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline] exit_to_user_mode_loop kernel/entry/common.c:75 [inline] __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline] irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline] irqentry_exit+0x38a/0x8c0 kernel/entry/common.c:196 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0033:0x7f3c2098f7d1 Code: 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 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f RSP: 002b:fffffffffffffffa EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f3c20be6270 RCX: 00007f3c2098f7c9 RDX: ffffffffffffffff RSI: fffffffffffffffa RDI: 0000000000008ffe RBP: 00007f3c20a13f91 R08: 0000000000000008 R09: 0000000000000000 R10: ffffffffff600000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3c20be6308 R14: 00007f3c20be6270 R15: 00007ffc401ad1a8 ---------------- Code disassembly (best guess): 0: 01 00 add %eax,(%rax) 2: 00 65 4c add %ah,0x4c(%rbp) 5: 8b 35 48 0d 19 12 mov 0x12190d48(%rip),%esi # 0x12190d53 b: 41 8b b6 2c 0b 00 00 mov 0xb2c(%r14),%esi 12: 85 f6 test %esi,%esi 14: 0f 85 ff 00 00 00 jne 0x119 1a: 48 81 3b 00 76 b9 93 cmpq $0xffffffff93b97600,(%rbx) 21: 0f 84 f2 00 00 00 je 0x119 27: 9c pushf 28: 41 5d pop %r13 * 2a: fa cli <-- trapping instruction 2b: 48 c7 c7 57 c4 bb 8d mov $0xffffffff8dbbc457,%rdi 32: e8 74 bc dc 09 call 0x9dcbcab 37: 65 ff 05 45 54 19 12 incl %gs:0x12195445(%rip) # 0x12195483 3e: 8b .byte 0x8b 3f: 0d .byte 0xd