------------[ cut here ]------------ ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ swapper/2/0 is trying to acquire lock: ffffffff8e6f3840 (console_owner){-...}-{0:0}, at: console_lock_spinning_enable+0x61/0x80 kernel/printk/printk.c:1902 but task is already holding lock: ffff88806a63b1a0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:655 [inline] ffff88806a63b1a0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x88/0x140 kernel/sched/core.c:639 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+0x2c/0x140 kernel/sched/core.c:647 raw_spin_rq_lock kernel/sched/sched.h:1615 [inline] _task_rq_lock+0xcf/0x490 kernel/sched/core.c:747 cgroup_move_task+0x81/0x2b0 kernel/sched/psi.c:1170 css_set_move_task+0x285/0x600 kernel/cgroup/cgroup.c:948 cgroup_post_fork+0x202/0x9b0 kernel/cgroup/cgroup.c:6917 copy_process+0x5717/0x7a40 kernel/fork.c:2467 kernel_clone+0xfc/0x9a0 kernel/fork.c:2653 user_mode_thread+0xcc/0x110 kernel/fork.c:2729 rest_init+0x21/0x260 init/main.c:725 start_kernel+0x47f/0x480 init/main.c:1210 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310 x86_64_start_kernel+0x12b/0x130 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:132 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:570 [inline] try_to_wake_up+0xb2/0x1a80 kernel/sched/core.c:4130 create_worker+0x346/0x750 kernel/workqueue.c:2847 workqueue_init+0x768/0x930 kernel/workqueue.c:8043 kernel_init_freeable+0x3d4/0x7a0 init/main.c:1677 kernel_init+0x1f/0x1e0 init/main.c:1582 ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #3 (&pool->lock){-.-.}-{2:2}: __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 __queue_work+0x270/0x1150 kernel/workqueue.c:2314 queue_work_on+0x1a9/0x1e0 kernel/workqueue.c:2405 queue_work include/linux/workqueue.h:669 [inline] rpm_suspend+0xee1/0x11c0 drivers/base/power/runtime.c:688 rpm_idle+0x637/0x7c0 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:551 [inline] __device_attach+0x37e/0x4d0 drivers/base/dd.c:1051 device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1088 bus_probe_device+0x64/0x160 drivers/base/bus.c:574 device_add+0x11d9/0x1950 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:3257 [inline] serial_core_register_port+0x13c/0x17a0 drivers/tty/serial/serial_core.c:3296 serial8250_register_8250_port+0x155a/0x2260 drivers/tty/serial/8250/8250_core.c:822 serial_pnp_probe+0x436/0x930 drivers/tty/serial/8250/8250_pnp.c:480 pnp_device_probe+0x2b3/0x4a0 drivers/pnp/driver.c:111 call_driver_probe drivers/base/dd.c:583 [inline] really_probe+0x241/0xa60 drivers/base/dd.c:661 __driver_probe_device+0x1de/0x400 drivers/base/dd.c:803 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:833 __driver_attach+0x217/0x5c0 drivers/base/dd.c:1227 bus_for_each_dev+0x13e/0x1d0 drivers/base/bus.c:383 bus_add_driver+0x305/0x5b0 drivers/base/bus.c:715 driver_register+0x1e2/0x360 drivers/base/driver.c:249 serial8250_init+0xcc/0x1b0 drivers/tty/serial/8250/8250_platform.c:317 do_one_initcall+0x11d/0x760 init/main.c:1382 do_initcall_level init/main.c:1444 [inline] do_initcalls init/main.c:1460 [inline] do_basic_setup init/main.c:1479 [inline] kernel_init_freeable+0x6e5/0x7a0 init/main.c:1692 kernel_init+0x1f/0x1e0 init/main.c:1582 ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #2 (&dev->power.lock){-.-.}-{3:3}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [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+0x1b0/0x510 drivers/tty/serial/serial_core.c:149 uart_write+0x211/0xb20 drivers/tty/serial/serial_core.c:633 process_output_block drivers/tty/n_tty.c:557 [inline] n_tty_write+0x44f/0x12d0 drivers/tty/n_tty.c:2366 iterate_tty_write drivers/tty/tty_io.c:1006 [inline] file_tty_write.isra.0+0x4d2/0x890 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:595 [inline] vfs_write+0x6ac/0x1070 fs/read_write.c:688 ksys_write+0x12a/0x250 fs/read_write.c:740 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x106/0xf80 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:132 [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:3183 [inline] console_flush_one_record+0x790/0xe50 kernel/printk/printk.c:3269 console_flush_all kernel/printk/printk.c:3343 [inline] __console_flush_and_unlock kernel/printk/printk.c:3373 [inline] console_unlock+0x103/0x260 kernel/printk/printk.c:3413 vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479 _printk+0xcf/0x110 kernel/printk/printk.c:2504 register_console.cold+0xc0/0x248 kernel/printk/printk.c:4208 univ8250_console_init+0x6f/0x80 drivers/tty/serial/8250/8250_core.c:515 console_init+0x423/0x620 kernel/printk/printk.c:4407 start_kernel+0x305/0x480 init/main.c:1147 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310 x86_64_start_kernel+0x12b/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+0x1cf/0x380 kernel/locking/lockdep.c:5825 console_lock_spinning_enable+0x72/0x80 kernel/printk/printk.c:1902 console_emit_next_record kernel/printk/printk.c:3177 [inline] console_flush_one_record+0x739/0xe50 kernel/printk/printk.c:3269 console_flush_all kernel/printk/printk.c:3343 [inline] __console_flush_and_unlock kernel/printk/printk.c:3373 [inline] console_unlock+0x103/0x260 kernel/printk/printk.c:3413 vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479 _printk+0xcf/0x110 kernel/printk/printk.c:2504 __report_bug.cold+0x15/0x137 lib/bug.c:243 report_bug+0xb2/0x220 lib/bug.c:281 handle_bug+0x16a/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 psi_enqueue kernel/sched/stats.h:147 [inline] enqueue_task+0x467/0x4f0 kernel/sched/core.c:2109 activate_task kernel/sched/core.c:2147 [inline] ttwu_do_activate+0x176/0x7c0 kernel/sched/core.c:3667 sched_ttwu_pending+0x2b3/0x660 kernel/sched/core.c:3754 csd_do_func kernel/smp.c:136 [inline] __flush_smp_call_function_queue+0x4d3/0x960 kernel/smp.c:593 __sysvec_call_function_single+0x81/0x470 arch/x86/kernel/smp.c:271 instr_sysvec_call_function_single arch/x86/kernel/smp.c:266 [inline] sysvec_call_function_single+0x9e/0xc0 arch/x86/kernel/smp.c:266 asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:704 native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline] pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:62 arch_safe_halt arch/x86/include/asm/paravirt.h:73 [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+0x43a/0x550 kernel/sched/idle.c:341 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:439 start_secondary+0x21d/0x2d0 arch/x86/kernel/smpboot.c:312 common_startup_64+0x13e/0x148 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 swapper/2/0: #0: ffff88806a63b1a0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:655 [inline] #0: ffff88806a63b1a0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x88/0x140 kernel/sched/core.c:639 #1: ffffffff8e7d3c80 (console_lock){+.+.}-{0:0}, at: _printk+0xcf/0x110 kernel/printk/printk.c:2504 #2: ffffffff8e7d3cf8 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:317 [inline] #2: ffffffff8e7d3cf8 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:428 [inline] #2: ffffffff8e7d3cf8 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:291 [inline] #2: ffffffff8e7d3cf8 (console_srcu){....}-{0:0}, at: console_flush_one_record+0xfd/0xe50 kernel/printk/printk.c:3246 stack backtrace: CPU: 2 UID: 0 PID: 0 Comm: swapper/2 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: __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+0x1cf/0x380 kernel/locking/lockdep.c:5825 console_lock_spinning_enable+0x72/0x80 kernel/printk/printk.c:1902 console_emit_next_record kernel/printk/printk.c:3177 [inline] console_flush_one_record+0x739/0xe50 kernel/printk/printk.c:3269 console_flush_all kernel/printk/printk.c:3343 [inline] __console_flush_and_unlock kernel/printk/printk.c:3373 [inline] console_unlock+0x103/0x260 kernel/printk/printk.c:3413 vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479 _printk+0xcf/0x110 kernel/printk/printk.c:2504 __report_bug.cold+0x15/0x137 lib/bug.c:243 report_bug+0xb2/0x220 lib/bug.c:281 handle_bug+0x16a/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:psi_enqueue kernel/sched/stats.h:147 [inline] RIP: 0010:enqueue_task+0x467/0x4f0 kernel/sched/core.c:2109 Code: fa 48 c1 ea 03 80 3c 02 00 0f 85 95 00 00 00 49 8b 84 24 28 0e 00 00 48 8d 78 48 e9 20 fe ff ff 90 0f 0b 90 e9 65 fe ff ff 90 <0f> 0b 90 e9 22 fd ff ff 4c 89 ef e8 39 be 9e 00 e9 e7 fb ff ff e8 RSP: 0018:ffffc90000648e30 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff88802e4f4980 RCX: ffff88806a63b140 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88802e4f4f71 RBP: 0000000000000000 R08: 1ffff1100d4c764a R09: ffff88806a63b140 R10: ffff88802e4f4a48 R11: 0000000000000001 R12: ffff88806a63b140 R13: 0000000000000001 R14: ffff88806a63b140 R15: ffff88806a63b140 activate_task kernel/sched/core.c:2147 [inline] ttwu_do_activate+0x176/0x7c0 kernel/sched/core.c:3667 sched_ttwu_pending+0x2b3/0x660 kernel/sched/core.c:3754 csd_do_func kernel/smp.c:136 [inline] __flush_smp_call_function_queue+0x4d3/0x960 kernel/smp.c:593 __sysvec_call_function_single+0x81/0x470 arch/x86/kernel/smp.c:271 instr_sysvec_call_function_single arch/x86/kernel/smp.c:266 [inline] sysvec_call_function_single+0x9e/0xc0 arch/x86/kernel/smp.c:266 asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:704 RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63 Code: 78 82 02 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d a3 61 1b 00 fb f4 fc 35 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 RSP: 0018:ffffc90000187df0 EFLAGS: 00000202 RAX: 0000000000081c0d RBX: ffff88801eafc980 RCX: ffffffff8b902c75 RDX: 0000000000000000 RSI: ffffffff8de77164 RDI: ffffffff8c1b0b20 RBP: 0000000000000002 R08: 0000000000000001 R09: ffffed100d4c6795 R10: ffff88806a633cab R11: 0000000000000000 R12: ffffed1003d5f930 R13: 0000000000000002 R14: ffffffff90d99410 R15: 0000000000000000 arch_safe_halt arch/x86/include/asm/paravirt.h:73 [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+0x43a/0x550 kernel/sched/idle.c:341 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:439 start_secondary+0x21d/0x2d0 arch/x86/kernel/smpboot.c:312 common_startup_64+0x13e/0x148 !(flags & ENQUEUE_MIGRATED) WARNING: kernel/sched/stats.h:147 at psi_enqueue kernel/sched/stats.h:147 [inline], CPU#2: swapper/2/0 WARNING: kernel/sched/stats.h:147 at enqueue_task+0x467/0x4f0 kernel/sched/core.c:2109, CPU#2: swapper/2/0 Modules linked in: CPU: 2 UID: 0 PID: 0 Comm: swapper/2 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:psi_enqueue kernel/sched/stats.h:147 [inline] RIP: 0010:enqueue_task+0x467/0x4f0 kernel/sched/core.c:2109 Code: fa 48 c1 ea 03 80 3c 02 00 0f 85 95 00 00 00 49 8b 84 24 28 0e 00 00 48 8d 78 48 e9 20 fe ff ff 90 0f 0b 90 e9 65 fe ff ff 90 <0f> 0b 90 e9 22 fd ff ff 4c 89 ef e8 39 be 9e 00 e9 e7 fb ff ff e8 RSP: 0018:ffffc90000648e30 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff88802e4f4980 RCX: ffff88806a63b140 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88802e4f4f71 RBP: 0000000000000000 R08: 1ffff1100d4c764a R09: ffff88806a63b140 R10: ffff88802e4f4a48 R11: 0000000000000001 R12: ffff88806a63b140 R13: 0000000000000001 R14: ffff88806a63b140 R15: ffff88806a63b140 FS: 0000000000000000(0000) GS:ffff8880d6542000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020ba0000 CR3: 000000002f0b8000 CR4: 0000000000352ef0 Call Trace: activate_task kernel/sched/core.c:2147 [inline] ttwu_do_activate+0x176/0x7c0 kernel/sched/core.c:3667 sched_ttwu_pending+0x2b3/0x660 kernel/sched/core.c:3754 csd_do_func kernel/smp.c:136 [inline] __flush_smp_call_function_queue+0x4d3/0x960 kernel/smp.c:593 __sysvec_call_function_single+0x81/0x470 arch/x86/kernel/smp.c:271 instr_sysvec_call_function_single arch/x86/kernel/smp.c:266 [inline] sysvec_call_function_single+0x9e/0xc0 arch/x86/kernel/smp.c:266 asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:704 RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63 Code: 78 82 02 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d a3 61 1b 00 fb f4 fc 35 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 RSP: 0018:ffffc90000187df0 EFLAGS: 00000202 RAX: 0000000000081c0d RBX: ffff88801eafc980 RCX: ffffffff8b902c75 RDX: 0000000000000000 RSI: ffffffff8de77164 RDI: ffffffff8c1b0b20 RBP: 0000000000000002 R08: 0000000000000001 R09: ffffed100d4c6795 R10: ffff88806a633cab R11: 0000000000000000 R12: ffffed1003d5f930 R13: 0000000000000002 R14: ffffffff90d99410 R15: 0000000000000000 arch_safe_halt arch/x86/include/asm/paravirt.h:73 [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+0x43a/0x550 kernel/sched/idle.c:341 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:439 start_secondary+0x21d/0x2d0 arch/x86/kernel/smpboot.c:312 common_startup_64+0x13e/0x148 ---------------- Code disassembly (best guess): 0: 78 82 js 0xffffff84 2: 02 c3 add %bl,%al 4: cc int3 5: cc int3 6: cc int3 7: cc int3 8: 0f 1f 00 nopl (%rax) b: 90 nop c: 90 nop d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: f3 0f 1e fa endbr64 1f: eb 07 jmp 0x28 21: 0f 00 2d a3 61 1b 00 verw 0x1b61a3(%rip) # 0x1b61cb 28: fb sti 29: f4 hlt * 2a: e9 fc 35 03 00 jmp 0x3362b <-- trapping instruction 2f: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) 36: 00 00 00 39: 66 90 xchg %ax,%ax 3b: 90 nop 3c: 90 nop 3d: 90 nop 3e: 90 nop 3f: 90 nop