====================================================== WARNING: possible circular locking dependency detected 5.14.0-rc1-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.5/12202 is trying to acquire lock: ffffffff8ba9afc0 (fs_reclaim){+.+.}-{0:0}, at: fs_reclaim_acquire+0xf7/0x160 mm/page_alloc.c:4574 but task is already holding lock: ffff8880b9c4d580 (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+0xe5/0x110 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 submit_bh fs/buffer.c:3056 [inline] __sync_dirty_buffer+0x16d/0x3f0 fs/buffer.c:3151 ext4_write_inode+0x574/0x630 fs/ext4/inode.c:5236 write_inode fs/fs-writeback.c:1463 [inline] __writeback_single_inode+0xa97/0xff0 fs/fs-writeback.c:1668 writeback_single_inode+0x2c7/0x4d0 fs/fs-writeback.c:1723 sync_inode fs/fs-writeback.c:2742 [inline] sync_inode_metadata+0x93/0xd0 fs/fs-writeback.c:2762 ext4_fsync_nojournal fs/ext4/fsync.c:92 [inline] ext4_sync_file+0xa59/0xfd0 fs/ext4/fsync.c:170 vfs_fsync_range+0x13a/0x220 fs/sync.c:200 generic_write_sync include/linux/fs.h:2987 [inline] ext4_buffered_write_iter+0x36a/0x4d0 fs/ext4/file.c:277 ext4_file_write_iter+0x423/0x14e0 fs/ext4/file.c:680 call_write_iter include/linux/fs.h:2114 [inline] new_sync_write+0x426/0x650 fs/read_write.c:518 vfs_write+0x75a/0xa40 fs/read_write.c:605 ksys_write+0x12d/0x250 fs/read_write.c:658 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_irq+0x4e/0x90 kernel/sched/core.c:6328 irqentry_exit+0x31/0x80 kernel/entry/common.c:427 asm_sysvec_reschedule_ipi+0x12/0x20 arch/x86/include/asm/idtentry.h:643 native_save_fl arch/x86/include/asm/irqflags.h:29 [inline] arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline] arch_local_irq_save arch/x86/include/asm/irqflags.h:106 [inline] lock_acquire kernel/locking/lockdep.c:5621 [inline] lock_acquire+0x15f/0x510 kernel/locking/lockdep.c:5590 fs_reclaim_acquire mm/page_alloc.c:4569 [inline] fs_reclaim_acquire+0xd2/0x160 mm/page_alloc.c:4560 might_alloc include/linux/sched/mm.h:198 [inline] slab_pre_alloc_hook mm/slab.h:485 [inline] slab_alloc_node mm/slub.c:2902 [inline] slab_alloc mm/slub.c:2989 [inline] kmem_cache_alloc+0x3e/0x3a0 mm/slub.c:2994 kmem_cache_zalloc include/linux/slab.h:711 [inline] __kernfs_new_node+0xd4/0x8b0 fs/kernfs/dir.c:583 kernfs_new_node+0x93/0x120 fs/kernfs/dir.c:645 __kernfs_create_file+0x51/0x350 fs/kernfs/file.c:985 sysfs_add_file_mode_ns+0x226/0x540 fs/sysfs/file.c:317 create_files fs/sysfs/group.c:64 [inline] internal_create_group+0x328/0xb20 fs/sysfs/group.c:149 kernel_add_sysfs_param kernel/params.c:796 [inline] param_sysfs_builtin kernel/params.c:833 [inline] param_sysfs_init+0x39a/0x498 kernel/params.c:952 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_alloc+0xfa1/0x1350 mm/percpu.c:1838 bpf_map_alloc_percpu+0x84/0x1a0 kernel/bpf/syscall.c:440 bpf_array_alloc_percpu kernel/bpf/arraymap.c:37 [inline] array_map_alloc+0x52e/0x710 kernel/bpf/arraymap.c:150 find_and_alloc_map kernel/bpf/syscall.c:127 [inline] map_create kernel/bpf/syscall.c:844 [inline] __sys_bpf+0xbc3/0x5410 kernel/bpf/syscall.c:4484 __do_sys_bpf kernel/bpf/syscall.c:4606 [inline] __se_sys_bpf kernel/bpf/syscall.c:4604 [inline] __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:4604 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 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 *** 2 locks held by syz-executor.5/12202: #0: ffffffff8ba7ba08 (pcpu_alloc_mutex){+.+.}-{3:3}, at: pcpu_alloc+0xb12/0x1350 mm/percpu.c:1778 #1: ffff8880b9c4d580 (lock#2){-.-.}-{2:2}, at: __alloc_pages_bulk+0x4ad/0x1870 mm/page_alloc.c:5279 stack backtrace: CPU: 0 PID: 12202 Comm: syz-executor.5 Not tainted 5.14.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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_alloc+0xfa1/0x1350 mm/percpu.c:1838 bpf_map_alloc_percpu+0x84/0x1a0 kernel/bpf/syscall.c:440 bpf_array_alloc_percpu kernel/bpf/arraymap.c:37 [inline] array_map_alloc+0x52e/0x710 kernel/bpf/arraymap.c:150 find_and_alloc_map kernel/bpf/syscall.c:127 [inline] map_create kernel/bpf/syscall.c:844 [inline] __sys_bpf+0xbc3/0x5410 kernel/bpf/syscall.c:4484 __do_sys_bpf kernel/bpf/syscall.c:4606 [inline] __se_sys_bpf kernel/bpf/syscall.c:4604 [inline] __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:4604 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 RIP: 0033:0x4665e9 Code: ff ff c3 66 2e 0f 1f 84 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 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1dbb1a1188 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000000000040 RSI: 0000000020000000 RDI: 0d00000000000000 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007fff395a661f R14: 00007f1dbb1a1300 R15: 0000000000022000 BUG: sleeping function called from invalid context at mm/page_alloc.c:5167 in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 12202, name: syz-executor.5 INFO: lockdep is turned off. irq event stamp: 17782 hardirqs last enabled at (17781): [] asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 hardirqs last disabled at (17782): [] __alloc_pages_bulk+0x1017/0x1870 mm/page_alloc.c:5279 softirqs last enabled at (17650): [] invoke_softirq kernel/softirq.c:432 [inline] softirqs last enabled at (17650): [] __irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636 softirqs last disabled at (17565): [] invoke_softirq kernel/softirq.c:432 [inline] softirqs last disabled at (17565): [] __irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636 CPU: 0 PID: 12202 Comm: syz-executor.5 Not tainted 5.14.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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_alloc+0xfa1/0x1350 mm/percpu.c:1838 bpf_map_alloc_percpu+0x84/0x1a0 kernel/bpf/syscall.c:440 bpf_array_alloc_percpu kernel/bpf/arraymap.c:37 [inline] array_map_alloc+0x52e/0x710 kernel/bpf/arraymap.c:150 find_and_alloc_map kernel/bpf/syscall.c:127 [inline] map_create kernel/bpf/syscall.c:844 [inline] __sys_bpf+0xbc3/0x5410 kernel/bpf/syscall.c:4484 __do_sys_bpf kernel/bpf/syscall.c:4606 [inline] __se_sys_bpf kernel/bpf/syscall.c:4604 [inline] __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:4604 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 RIP: 0033:0x4665e9 Code: ff ff c3 66 2e 0f 1f 84 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 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1dbb1a1188 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000000000040 RSI: 0000000020000000 RDI: 0d00000000000000 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007fff395a661f R14: 00007f1dbb1a1300 R15: 0000000000022000