Hello, syzbot found the following issue on: HEAD commit: 78124b0c1d10 Merge branch 'for-next/core' into for-kernelci git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=16a27383680000 kernel config: https://syzkaller.appspot.com/x/.config?x=9c7a3e91cde52da dashboard link: https://syzkaller.appspot.com/bug?extid=eb3e11a15d6b5e663c64 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm64 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/3ee1b279e6c2/disk-78124b0c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/0f927e3a1d2b/vmlinux-78124b0c.xz kernel image: https://storage.googleapis.com/syzbot-assets/9b7abda45082/Image-78124b0c.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+eb3e11a15d6b5e663c64@xxxxxxxxxxxxxxxxxxxxxxxxx EEVDF scheduling fail, picking leftmost ====================================================== WARNING: possible circular locking dependency detected 6.6.0-rc6-syzkaller-g78124b0c1d10 #0 Not tainted ------------------------------------------------------ ksoftirqd/0/16 is trying to acquire lock: ffff80008e509100 (console_owner){....}-{0:0}, at: console_lock_spinning_enable+0x38/0x78 kernel/printk/printk.c:1855 but task is already holding lock: ffff0001b4189d58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:558 [inline] ffff0001b4189d58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1372 [inline] ffff0001b4189d58 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1681 [inline] ffff0001b4189d58 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x2d8/0x23b4 kernel/sched/core.c:6612 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+0x50/0x6c kernel/locking/spinlock.c:378 raw_spin_rq_lock_nested+0x2c/0x44 kernel/sched/core.c:558 raw_spin_rq_lock kernel/sched/sched.h:1372 [inline] rq_lock kernel/sched/sched.h:1681 [inline] task_fork_fair+0x74/0x128 kernel/sched/fair.c:12416 sched_cgroup_fork+0x38c/0x464 kernel/sched/core.c:4816 copy_process+0x24bc/0x34b8 kernel/fork.c:2609 kernel_clone+0x1d8/0x80c kernel/fork.c:2909 user_mode_thread+0x110/0x178 kernel/fork.c:2987 rest_init+0x2c/0x2f4 init/main.c:691 start_kernel+0x0/0x4e8 init/main.c:823 start_kernel+0x3e8/0x4e8 init/main.c:1068 __primary_switched+0xb8/0xc0 arch/arm64/kernel/head.S:523 -> #4 (&p->pi_lock){-.-.}-{2:2}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:162 class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:518 [inline] try_to_wake_up+0xb0/0xe80 kernel/sched/core.c:4230 wake_up_process+0x18/0x24 kernel/sched/core.c:4478 kick_pool+0x29c/0x36c kernel/workqueue.c:1142 create_worker+0x518/0x6ec kernel/workqueue.c:2217 workqueue_init+0x338/0x63c kernel/workqueue.c:6694 kernel_init_freeable+0x2f8/0x474 init/main.c:1532 kernel_init+0x24/0x29c init/main.c:1437 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:857 -> #3 (&pool->lock){-.-.}-{2:2}: __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x48/0x60 kernel/locking/spinlock.c:154 __queue_work+0x878/0x1338 queue_work_on+0x9c/0x128 kernel/workqueue.c:1834 queue_work include/linux/workqueue.h:554 [inline] rpm_suspend+0xea8/0x1aac drivers/base/power/runtime.c:660 rpm_idle+0x1f8/0xd90 drivers/base/power/runtime.c:534 __pm_runtime_idle+0x1a4/0x498 drivers/base/power/runtime.c:1102 pm_runtime_put include/linux/pm_runtime.h:460 [inline] __device_attach+0x34c/0x434 drivers/base/dd.c:1048 device_initial_probe+0x24/0x34 drivers/base/dd.c:1079 bus_probe_device+0x178/0x240 drivers/base/bus.c:532 device_add+0x768/0xaac drivers/base/core.c:3624 serial_base_port_add+0x25c/0x370 drivers/tty/serial/serial_base_bus.c:178 serial_core_port_device_add drivers/tty/serial/serial_core.c:3315 [inline] serial_core_register_port+0x308/0x1a5c drivers/tty/serial/serial_core.c:3356 serial_ctrl_register_port+0x28/0x38 drivers/tty/serial/serial_ctrl.c:41 uart_add_one_port+0x28/0x38 drivers/tty/serial/serial_port.c:75 pl011_register_port+0x1a0/0x434 drivers/tty/serial/amba-pl011.c:2780 sbsa_uart_probe+0x474/0x5dc drivers/tty/serial/amba-pl011.c:2939 platform_probe+0x148/0x1c0 drivers/base/platform.c:1404 really_probe+0x394/0xa7c drivers/base/dd.c:658 __driver_probe_device+0x194/0x3b4 drivers/base/dd.c:800 driver_probe_device+0x78/0x330 drivers/base/dd.c:830 __device_attach_driver+0x2a8/0x4f4 drivers/base/dd.c:958 bus_for_each_drv+0x228/0x2bc drivers/base/bus.c:457 __device_attach+0x2b4/0x434 drivers/base/dd.c:1030 device_initial_probe+0x24/0x34 drivers/base/dd.c:1079 bus_probe_device+0x178/0x240 drivers/base/bus.c:532 device_add+0x768/0xaac drivers/base/core.c:3624 platform_device_add+0x3f8/0x708 drivers/base/platform.c:717 platform_device_register_full+0x4e4/0x5fc drivers/base/platform.c:844 acpi_create_platform_device+0x5bc/0x744 drivers/acpi/acpi_platform.c:177 acpi_default_enumeration+0x6c/0xdc drivers/acpi/scan.c:2116 acpi_bus_attach+0x8bc/0xaac drivers/acpi/scan.c:2225 acpi_dev_for_one_check+0xa0/0xb4 drivers/acpi/bus.c:1100 device_for_each_child+0xec/0x174 drivers/base/core.c:3953 acpi_dev_for_each_child+0xc4/0x108 drivers/acpi/bus.c:1112 acpi_bus_attach+0x358/0xaac drivers/acpi/scan.c:2230 acpi_dev_for_one_check+0xa0/0xb4 drivers/acpi/bus.c:1100 device_for_each_child+0xec/0x174 drivers/base/core.c:3953 acpi_dev_for_each_child+0xc4/0x108 drivers/acpi/bus.c:1112 acpi_bus_attach+0x358/0xaac drivers/acpi/scan.c:2230 acpi_bus_scan+0xfc/0x4cc drivers/acpi/scan.c:2496 acpi_scan_init+0x218/0x6b4 drivers/acpi/scan.c:2655 acpi_init+0x190/0x254 drivers/acpi/bus.c:1417 do_one_initcall+0x23c/0x98c init/main.c:1232 do_initcall_level+0x154/0x214 init/main.c:1294 do_initcalls+0x58/0xac init/main.c:1310 do_basic_setup+0x8c/0xa0 init/main.c:1329 kernel_init_freeable+0x320/0x474 init/main.c:1547 kernel_init+0x24/0x29c init/main.c:1437 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:857 -> #2 (&dev->power.lock){-...}-{2:2}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:162 __pm_runtime_resume+0xf0/0x180 drivers/base/power/runtime.c:1169 pm_runtime_get include/linux/pm_runtime.h:408 [inline] __uart_start+0x158/0x380 drivers/tty/serial/serial_core.c:148 uart_write+0x3a8/0x594 drivers/tty/serial/serial_core.c:618 process_output_block drivers/tty/n_tty.c:579 [inline] n_tty_write+0xaec/0xed0 drivers/tty/n_tty.c:2384 iterate_tty_write drivers/tty/tty_io.c:1017 [inline] file_tty_write+0x40c/0x77c drivers/tty/tty_io.c:1088 tty_write drivers/tty/tty_io.c:1109 [inline] redirected_tty_write+0xc0/0xfc drivers/tty/tty_io.c:1132 call_write_iter include/linux/fs.h:1956 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x628/0x93c fs/read_write.c:584 ksys_write+0x15c/0x26c fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:646 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 -> #1 (&port_lock_key){....}-{2:2}: __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x48/0x60 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] pl011_console_write+0x180/0x708 drivers/tty/serial/amba-pl011.c:2341 console_emit_next_record kernel/printk/printk.c:2910 [inline] console_flush_all+0x5d0/0xb78 kernel/printk/printk.c:2966 console_unlock+0xec/0x3d4 kernel/printk/printk.c:3035 vprintk_emit+0x150/0x2e8 kernel/printk/printk.c:2307 vprintk_default+0xa0/0xe4 kernel/printk/printk.c:2322 vprintk+0x200/0x2d4 kernel/printk/printk_safe.c:45 _printk+0xdc/0x128 kernel/printk/printk.c:2332 register_console+0x938/0xcf8 kernel/printk/printk.c:3524 uart_configure_port drivers/tty/serial/serial_core.c:2605 [inline] serial_core_add_one_port drivers/tty/serial/serial_core.c:3132 [inline] serial_core_register_port+0x1330/0x1a5c drivers/tty/serial/serial_core.c:3360 serial_ctrl_register_port+0x28/0x38 drivers/tty/serial/serial_ctrl.c:41 uart_add_one_port+0x28/0x38 drivers/tty/serial/serial_port.c:75 pl011_register_port+0x1a0/0x434 drivers/tty/serial/amba-pl011.c:2780 sbsa_uart_probe+0x474/0x5dc drivers/tty/serial/amba-pl011.c:2939 platform_probe+0x148/0x1c0 drivers/base/platform.c:1404 really_probe+0x394/0xa7c drivers/base/dd.c:658 __driver_probe_device+0x194/0x3b4 drivers/base/dd.c:800 driver_probe_device+0x78/0x330 drivers/base/dd.c:830 __device_attach_driver+0x2a8/0x4f4 drivers/base/dd.c:958 bus_for_each_drv+0x228/0x2bc drivers/base/bus.c:457 __device_attach+0x2b4/0x434 drivers/base/dd.c:1030 device_initial_probe+0x24/0x34 drivers/base/dd.c:1079 bus_probe_device+0x178/0x240 drivers/base/bus.c:532 device_add+0x768/0xaac drivers/base/core.c:3624 platform_device_add+0x3f8/0x708 drivers/base/platform.c:717 platform_device_register_full+0x4e4/0x5fc drivers/base/platform.c:844 acpi_create_platform_device+0x5bc/0x744 drivers/acpi/acpi_platform.c:177 acpi_default_enumeration+0x6c/0xdc drivers/acpi/scan.c:2116 acpi_bus_attach+0x8bc/0xaac drivers/acpi/scan.c:2225 acpi_dev_for_one_check+0xa0/0xb4 drivers/acpi/bus.c:1100 device_for_each_child+0xec/0x174 drivers/base/core.c:3953 acpi_dev_for_each_child+0xc4/0x108 drivers/acpi/bus.c:1112 acpi_bus_attach+0x358/0xaac drivers/acpi/scan.c:2230 acpi_dev_for_one_check+0xa0/0xb4 drivers/acpi/bus.c:1100 device_for_each_child+0xec/0x174 drivers/base/core.c:3953 acpi_dev_for_each_child+0xc4/0x108 drivers/acpi/bus.c:1112 acpi_bus_attach+0x358/0xaac drivers/acpi/scan.c:2230 acpi_bus_scan+0xfc/0x4cc drivers/acpi/scan.c:2496 acpi_scan_init+0x218/0x6b4 drivers/acpi/scan.c:2655 acpi_init+0x190/0x254 drivers/acpi/bus.c:1417 do_one_initcall+0x23c/0x98c init/main.c:1232 do_initcall_level+0x154/0x214 init/main.c:1294 do_initcalls+0x58/0xac init/main.c:1310 do_basic_setup+0x8c/0xa0 init/main.c:1329 kernel_init_freeable+0x320/0x474 init/main.c:1547 kernel_init+0x24/0x29c init/main.c:1437 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:857 -> #0 (console_owner){....}-{0:0}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3868 [inline] __lock_acquire+0x3370/0x75e8 kernel/locking/lockdep.c:5136 lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5753 console_lock_spinning_enable+0x68/0x78 kernel/printk/printk.c:1858 console_emit_next_record kernel/printk/printk.c:2904 [inline] console_flush_all+0x590/0xb78 kernel/printk/printk.c:2966 console_unlock+0xec/0x3d4 kernel/printk/printk.c:3035 vprintk_emit+0x150/0x2e8 kernel/printk/printk.c:2307 vprintk_default+0xa0/0xe4 kernel/printk/printk.c:2322 vprintk+0x200/0x2d4 kernel/printk/printk_safe.c:45 _printk+0xdc/0x128 kernel/printk/printk.c:2332 pick_eevdf+0x610/0x618 kernel/sched/fair.c:976 pick_next_entity kernel/sched/fair.c:5278 [inline] pick_next_task_fair+0x104/0x930 kernel/sched/fair.c:8222 __pick_next_task kernel/sched/core.c:6004 [inline] pick_next_task kernel/sched/core.c:6514 [inline] __schedule+0x638/0x23b4 kernel/sched/core.c:6659 schedule+0xc4/0x170 kernel/sched/core.c:6771 smpboot_thread_fn+0x51c/0x90c kernel/smpboot.c:160 kthread+0x288/0x310 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:857 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 ksoftirqd/0/16: #0: ffff0001b4189d58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:558 [inline] #0: ffff0001b4189d58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1372 [inline] #0: ffff0001b4189d58 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1681 [inline] #0: ffff0001b4189d58 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x2d8/0x23b4 kernel/sched/core.c:6612 #1: ffff80008e3f0a20 (console_lock){+.+.}-{0:0}, at: vprintk_emit+0x134/0x2e8 kernel/printk/printk.c:2306 #2: ffff80008e3f0650 (console_srcu){....}-{0:0}, at: rcu_lock_acquire+0x18/0x54 include/linux/rcupdate.h:302 stack backtrace: CPU: 0 PID: 16 Comm: ksoftirqd/0 Not tainted 6.6.0-rc6-syzkaller-g78124b0c1d10 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 dump_stack+0x1c/0x28 lib/dump_stack.c:113 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2060 check_noncircular+0x310/0x404 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3868 [inline] __lock_acquire+0x3370/0x75e8 kernel/locking/lockdep.c:5136 lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5753 console_lock_spinning_enable+0x68/0x78 kernel/printk/printk.c:1858 console_emit_next_record kernel/printk/printk.c:2904 [inline] console_flush_all+0x590/0xb78 kernel/printk/printk.c:2966 console_unlock+0xec/0x3d4 kernel/printk/printk.c:3035 vprintk_emit+0x150/0x2e8 kernel/printk/printk.c:2307 vprintk_default+0xa0/0xe4 kernel/printk/printk.c:2322 vprintk+0x200/0x2d4 kernel/printk/printk_safe.c:45 _printk+0xdc/0x128 kernel/printk/printk.c:2332 pick_eevdf+0x610/0x618 kernel/sched/fair.c:976 pick_next_entity kernel/sched/fair.c:5278 [inline] pick_next_task_fair+0x104/0x930 kernel/sched/fair.c:8222 __pick_next_task kernel/sched/core.c:6004 [inline] pick_next_task kernel/sched/core.c:6514 [inline] __schedule+0x638/0x23b4 kernel/sched/core.c:6659 schedule+0xc4/0x170 kernel/sched/core.c:6771 smpboot_thread_fn+0x51c/0x90c kernel/smpboot.c:160 kthread+0x288/0x310 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:857 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
