IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready ====================================================== WARNING: possible circular locking dependency detected 5.14.0-rc1-syzkaller #0 Not tainted ------------------------------------------------------ kworker/0:9/9776 is trying to acquire lock: ffffffff8ba97aa0 (fs_reclaim){+.+.}-{0:0}, at: fs_reclaim_acquire+0xf7/0x160 mm/page_alloc.c:4574 but task is already holding lock: ffff8880b9c4d660 (lock#2){-.-.}-{2:2}, at: __alloc_pages_bulk+0x4ad/0x1870 mm/page_alloc.c:5279 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (lock#2){-.-.}-{2:2}: local_lock_acquire include/linux/local_lock_internal.h:42 [inline] rmqueue_pcplist mm/page_alloc.c:3663 [inline] rmqueue mm/page_alloc.c:3701 [inline] get_page_from_freelist+0x4aa/0x2f80 mm/page_alloc.c:4163 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5374 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2244 stack_depot_save+0x39d/0x4e0 lib/stackdepot.c:303 kasan_save_stack+0x32/0x40 mm/kasan/common.c:40 kasan_record_aux_stack+0xa4/0xd0 mm/kasan/generic.c:348 insert_work+0x48/0x370 kernel/workqueue.c:1332 __queue_work+0x5c1/0xed0 kernel/workqueue.c:1498 __queue_delayed_work+0x1c8/0x270 kernel/workqueue.c:1645 mod_delayed_work_on+0xdd/0x220 kernel/workqueue.c:1719 kblockd_mod_delayed_work_on+0x26/0x30 block/blk-core.c:1633 __blk_mq_delay_run_hw_queue+0x38d/0x640 block/blk-mq.c:1585 blk_mq_run_hw_queue+0x16c/0x2f0 block/blk-mq.c:1630 blk_mq_sched_insert_request+0x368/0x450 block/blk-mq-sched.c:479 blk_mq_submit_bio+0xe5f/0x1860 block/blk-mq.c:2296 __submit_bio_noacct_mq block/blk-core.c:1011 [inline] submit_bio_noacct block/blk-core.c:1044 [inline] submit_bio_noacct+0xad2/0xf20 block/blk-core.c:1027 submit_bio+0x1ea/0x470 block/blk-core.c:1106 submit_bh_wbc+0x5eb/0x7f0 fs/buffer.c:3050 __ext4_read_bh fs/ext4/super.c:158 [inline] ext4_read_bh+0x152/0x300 fs/ext4/super.c:182 ext4_read_bh_lock+0x82/0x180 fs/ext4/super.c:194 ext4_bread+0x109/0x1c0 fs/ext4/inode.c:906 __ext4_read_dirblock+0x34/0xe00 fs/ext4/namei.c:115 ext4_dx_find_entry+0x310/0x580 fs/ext4/namei.c:1724 __ext4_find_entry+0xcdd/0x1050 fs/ext4/namei.c:1564 ext4_lookup_entry fs/ext4/namei.c:1700 [inline] ext4_lookup fs/ext4/namei.c:1768 [inline] ext4_lookup+0x4fc/0x730 fs/ext4/namei.c:1759 __lookup_slow+0x24c/0x480 fs/namei.c:1646 lookup_slow fs/namei.c:1663 [inline] walk_component+0x40f/0x6a0 fs/namei.c:1959 lookup_last fs/namei.c:2414 [inline] path_lookupat+0x1bb/0x860 fs/namei.c:2438 filename_lookup+0x1c6/0x5b0 fs/namei.c:2467 user_path_at include/linux/namei.h:57 [inline] vfs_statx+0x142/0x390 fs/stat.c:203 vfs_fstatat fs/stat.c:225 [inline] vfs_stat include/linux/fs.h:3382 [inline] __do_sys_newstat+0x91/0x110 fs/stat.c:367 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae -> #1 (&pool->lock){-.-.}-{2:2}: __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 __queue_work+0x366/0xed0 kernel/workqueue.c:1455 queue_work_on+0xee/0x110 kernel/workqueue.c:1525 queue_work include/linux/workqueue.h:507 [inline] schedule_work include/linux/workqueue.h:568 [inline] __vfree_deferred mm/vmalloc.c:2609 [inline] vfree_atomic+0xac/0xe0 mm/vmalloc.c:2627 free_thread_stack kernel/fork.c:292 [inline] release_task_stack kernel/fork.c:432 [inline] put_task_stack+0x2e0/0x4e0 kernel/fork.c:443 finish_task_switch.isra.0+0x77f/0xa50 kernel/sched/core.c:4595 context_switch kernel/sched/core.c:4686 [inline] __schedule+0x942/0x26f0 kernel/sched/core.c:5940 preempt_schedule_notrace+0x5b/0xd0 kernel/sched/core.c:6179 preempt_schedule_notrace_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:36 rcu_read_unlock_sched_notrace include/linux/rcupdate.h:809 [inline] trace_lock_release include/trace/events/lock.h:58 [inline] lock_release+0x538/0x720 kernel/locking/lockdep.c:5636 might_alloc include/linux/sched/mm.h:199 [inline] slab_pre_alloc_hook mm/slab.h:485 [inline] slab_alloc mm/slab.c:3306 [inline] __do_kmalloc mm/slab.c:3700 [inline] __kmalloc+0x62/0x4d0 mm/slab.c:3711 kmalloc include/linux/slab.h:596 [inline] kzalloc include/linux/slab.h:721 [inline] kobject_get_path+0xbe/0x230 lib/kobject.c:179 kobject_uevent_env+0x265/0x1650 lib/kobject_uevent.c:529 version_sysfs_builtin kernel/params.c:860 [inline] param_sysfs_init+0x146/0x498 kernel/params.c:951 do_one_initcall+0x103/0x650 init/main.c:1282 do_initcall_level init/main.c:1355 [inline] do_initcalls init/main.c:1371 [inline] do_basic_setup init/main.c:1391 [inline] kernel_init_freeable+0x6b8/0x741 init/main.c:1593 kernel_init+0x1a/0x1d0 init/main.c:1485 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 -> #0 (fs_reclaim){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3051 [inline] check_prevs_add kernel/locking/lockdep.c:3174 [inline] validate_chain kernel/locking/lockdep.c:3789 [inline] __lock_acquire+0x2a07/0x54a0 kernel/locking/lockdep.c:5015 lock_acquire kernel/locking/lockdep.c:5625 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590 __fs_reclaim_acquire mm/page_alloc.c:4552 [inline] fs_reclaim_acquire+0x117/0x160 mm/page_alloc.c:4566 prepare_alloc_pages+0x15c/0x580 mm/page_alloc.c:5164 __alloc_pages+0x12f/0x500 mm/page_alloc.c:5363 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2244 stack_depot_save+0x39d/0x4e0 lib/stackdepot.c:303 save_stack+0x15e/0x1e0 mm/page_owner.c:120 __set_page_owner+0x50/0x290 mm/page_owner.c:181 prep_new_page mm/page_alloc.c:2433 [inline] __alloc_pages_bulk+0x8b9/0x1870 mm/page_alloc.c:5301 alloc_pages_bulk_array_node include/linux/gfp.h:557 [inline] vm_area_alloc_pages mm/vmalloc.c:2793 [inline] __vmalloc_area_node mm/vmalloc.c:2863 [inline] __vmalloc_node_range+0x39d/0x960 mm/vmalloc.c:2966 __vmalloc_node mm/vmalloc.c:3015 [inline] __vmalloc+0x69/0x80 mm/vmalloc.c:3029 pcpu_mem_zalloc mm/percpu.c:517 [inline] pcpu_mem_zalloc+0x51/0xa0 mm/percpu.c:509 pcpu_alloc_chunk mm/percpu.c:1473 [inline] pcpu_create_chunk+0x215/0x720 mm/percpu-vm.c:338 pcpu_balance_populated mm/percpu.c:2114 [inline] pcpu_balance_workfn+0xab4/0xe10 mm/percpu.c:2252 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 other info that might help us debug this: Chain exists of: fs_reclaim --> &pool->lock --> lock#2 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(lock#2); lock(&pool->lock); lock(lock#2); lock(fs_reclaim); *** DEADLOCK *** 4 locks held by kworker/0:9/9776: #0: ffff888010867d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888010867d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:620 [inline] #0: ffff888010867d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888010867d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:617 [inline] #0: ffff888010867d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: ffff888010867d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x871/0x1630 kernel/workqueue.c:2247 #1: ffffc90001dc7db0 (pcpu_balance_work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1630 kernel/workqueue.c:2251 #2: ffffffff8ba784e8 (pcpu_alloc_mutex){+.+.}-{3:3}, at: pcpu_balance_workfn+0x21/0xe10 mm/percpu.c:2247 #3: ffff8880b9c4d660 (lock#2){-.-.}-{2:2}, at: __alloc_pages_bulk+0x4ad/0x1870 mm/page_alloc.c:5279 stack backtrace: CPU: 0 PID: 9776 Comm: kworker/0:9 Not tainted 5.14.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events pcpu_balance_workfn Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2131 check_prev_add kernel/locking/lockdep.c:3051 [inline] check_prevs_add kernel/locking/lockdep.c:3174 [inline] validate_chain kernel/locking/lockdep.c:3789 [inline] __lock_acquire+0x2a07/0x54a0 kernel/locking/lockdep.c:5015 lock_acquire kernel/locking/lockdep.c:5625 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590 __fs_reclaim_acquire mm/page_alloc.c:4552 [inline] fs_reclaim_acquire+0x117/0x160 mm/page_alloc.c:4566 prepare_alloc_pages+0x15c/0x580 mm/page_alloc.c:5164 __alloc_pages+0x12f/0x500 mm/page_alloc.c:5363 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2244 stack_depot_save+0x39d/0x4e0 lib/stackdepot.c:303 save_stack+0x15e/0x1e0 mm/page_owner.c:120 __set_page_owner+0x50/0x290 mm/page_owner.c:181 prep_new_page mm/page_alloc.c:2433 [inline] __alloc_pages_bulk+0x8b9/0x1870 mm/page_alloc.c:5301 alloc_pages_bulk_array_node include/linux/gfp.h:557 [inline] vm_area_alloc_pages mm/vmalloc.c:2793 [inline] __vmalloc_area_node mm/vmalloc.c:2863 [inline] __vmalloc_node_range+0x39d/0x960 mm/vmalloc.c:2966 __vmalloc_node mm/vmalloc.c:3015 [inline] __vmalloc+0x69/0x80 mm/vmalloc.c:3029 pcpu_mem_zalloc mm/percpu.c:517 [inline] pcpu_mem_zalloc+0x51/0xa0 mm/percpu.c:509 pcpu_alloc_chunk mm/percpu.c:1473 [inline] pcpu_create_chunk+0x215/0x720 mm/percpu-vm.c:338 pcpu_balance_populated mm/percpu.c:2114 [inline] pcpu_balance_workfn+0xab4/0xe10 mm/percpu.c:2252 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 BUG: sleeping function called from invalid context at mm/page_alloc.c:5167 in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 9776, name: kworker/0:9 INFO: lockdep is turned off. irq event stamp: 7496 hardirqs last enabled at (7495): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (7495): [] _raw_spin_unlock_irqrestore+0x50/0x70 kernel/locking/spinlock.c:191 hardirqs last disabled at (7496): [] __alloc_pages_bulk+0x1017/0x1870 mm/page_alloc.c:5279 softirqs last enabled at (7124): [] do_softirq.part.0+0xde/0x130 kernel/softirq.c:459 softirqs last disabled at (7077): [] do_softirq.part.0+0xde/0x130 kernel/softirq.c:459 CPU: 0 PID: 9776 Comm: kworker/0:9 Not tainted 5.14.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events pcpu_balance_workfn Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 ___might_sleep.cold+0x1f1/0x237 kernel/sched/core.c:9154 prepare_alloc_pages+0x3da/0x580 mm/page_alloc.c:5167 __alloc_pages+0x12f/0x500 mm/page_alloc.c:5363 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2244 stack_depot_save+0x39d/0x4e0 lib/stackdepot.c:303 save_stack+0x15e/0x1e0 mm/page_owner.c:120 __set_page_owner+0x50/0x290 mm/page_owner.c:181 prep_new_page mm/page_alloc.c:2433 [inline] __alloc_pages_bulk+0x8b9/0x1870 mm/page_alloc.c:5301 alloc_pages_bulk_array_node include/linux/gfp.h:557 [inline] vm_area_alloc_pages mm/vmalloc.c:2793 [inline] __vmalloc_area_node mm/vmalloc.c:2863 [inline] __vmalloc_node_range+0x39d/0x960 mm/vmalloc.c:2966 __vmalloc_node mm/vmalloc.c:3015 [inline] __vmalloc+0x69/0x80 mm/vmalloc.c:3029 pcpu_mem_zalloc mm/percpu.c:517 [inline] pcpu_mem_zalloc+0x51/0xa0 mm/percpu.c:509 pcpu_alloc_chunk mm/percpu.c:1473 [inline] pcpu_create_chunk+0x215/0x720 mm/percpu-vm.c:338 pcpu_balance_populated mm/percpu.c:2114 [inline] pcpu_balance_workfn+0xab4/0xe10 mm/percpu.c:2252 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 usb 4-1: new high-speed USB device number 2 using dummy_hcd usb 4-1: New USB device found, idVendor=0cf3, idProduct=9271, bcdDevice= 1.08 usb 4-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 4-1: Product: syz usb 4-1: Manufacturer: syz usb 4-1: SerialNumber: syz usb 4-1: ath9k_htc: Firmware ath9k_htc/htc_9271-1.4.0.fw requested usb 4-1: ath9k_htc: Transferred FW: ath9k_htc/htc_9271-1.4.0.fw, size: 51008 usb 4-1: Service connection timeout for: 256 ath9k_htc 4-1:1.0: ath9k_htc: Unable to initialize HTC services ath9k_htc: Failed to initialize the device usb 3-1: USB disconnect, device number 4 usb 3-1: ath9k_htc: USB layer deinitialized usb 3-1: new high-speed USB device number 5 using dummy_hcd usb 3-1: New USB device found, idVendor=0cf3, idProduct=9271, bcdDevice= 1.08 usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 3-1: Product: syz usb 3-1: Manufacturer: syz usb 3-1: SerialNumber: syz usb 3-1: ath9k_htc: Firmware ath9k_htc/htc_9271-1.4.0.fw requested usb 3-1: ath9k_htc: Transferred FW: ath9k_htc/htc_9271-1.4.0.fw, size: 51008