====================================================== WARNING: possible circular locking dependency detected 5.14.0-rc1-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/8698 is trying to acquire lock: ffffffff8ba9c460 (fs_reclaim){+.+.}-{0:0}, at: fs_reclaim_acquire+0xf7/0x160 mm/page_alloc.c:4574 but task is already holding lock: ffff8880b9d4d660 (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_page_interleave+0x1e/0x200 mm/mempolicy.c:2119 alloc_pages+0x238/0x2a0 mm/mempolicy.c:2242 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 __ext4_read_bh fs/ext4/super.c:158 [inline] ext4_read_bh_nowait+0x155/0x220 fs/ext4/super.c:170 ext4_read_bh_lock+0x5e/0x180 fs/ext4/super.c:195 ext4_bread_batch+0x396/0x550 fs/ext4/inode.c:932 __ext4_find_entry+0x482/0x1050 fs/ext4/namei.c:1599 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 init_mount+0x7e/0xf4 fs/init.c:22 devtmpfs_mount+0x54/0x97 drivers/base/devtmpfs.c:366 prepare_namespace+0x209/0x234 init/do_mounts.c:609 kernel_init_freeable+0x729/0x741 init/main.c:1606 kernel_init+0x1a/0x1d0 init/main.c:1485 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 -> #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_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 lock_acquire+0x1ef/0x510 kernel/locking/lockdep.c:5593 __fs_reclaim_acquire mm/page_alloc.c:4552 [inline] fs_reclaim_acquire+0x117/0x160 mm/page_alloc.c:4566 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] copy_signal kernel/fork.c:1570 [inline] copy_process+0x2427/0x74d0 kernel/fork.c:2116 kernel_clone+0xe7/0xac0 kernel/fork.c:2509 kernel_thread+0xb5/0xf0 kernel/fork.c:2561 call_usermodehelper_exec_work kernel/umh.c:174 [inline] call_usermodehelper_exec_work+0xcc/0x180 kernel/umh.c:160 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 -> #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+0x67/0x80 mm/vmalloc.c:3048 netlink_alloc_large_skb net/netlink/af_netlink.c:1191 [inline] netlink_sendmsg+0x5f0/0xdb0 net/netlink/af_netlink.c:1904 sock_sendmsg_nosec net/socket.c:702 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:722 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2385 ___sys_sendmsg+0xf3/0x170 net/socket.c:2439 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2468 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 *** 1 lock held by syz-executor.0/8698: #0: ffff8880b9d4d660 (lock#2){-.-.}-{2:2}, at: __alloc_pages_bulk+0x4ad/0x1870 mm/page_alloc.c:5279 stack backtrace: CPU: 1 PID: 8698 Comm: syz-executor.0 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+0x67/0x80 mm/vmalloc.c:3048 netlink_alloc_large_skb net/netlink/af_netlink.c:1191 [inline] netlink_sendmsg+0x5f0/0xdb0 net/netlink/af_netlink.c:1904 sock_sendmsg_nosec net/socket.c:702 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:722 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2385 ___sys_sendmsg+0xf3/0x170 net/socket.c:2439 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2468 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: 0033:0x4665d9 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:00007fb18e91c188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000005 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 0000000000a9fb1f R14: 00007fb18e91c300 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: 8698, name: syz-executor.0 INFO: lockdep is turned off. irq event stamp: 712 hardirqs last enabled at (711): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (711): [] _raw_spin_unlock_irqrestore+0x50/0x70 kernel/locking/spinlock.c:191 hardirqs last disabled at (712): [] __alloc_pages_bulk+0x1017/0x1870 mm/page_alloc.c:5279 softirqs last enabled at (656): [] netlink_insert+0x187/0x1690 net/netlink/af_netlink.c:600 softirqs last disabled at (654): [] spin_lock_bh include/linux/spinlock.h:359 [inline] softirqs last disabled at (654): [] release_sock+0x1b/0x1b0 net/core/sock.c:3116 CPU: 1 PID: 8698 Comm: syz-executor.0 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+0x67/0x80 mm/vmalloc.c:3048 netlink_alloc_large_skb net/netlink/af_netlink.c:1191 [inline] netlink_sendmsg+0x5f0/0xdb0 net/netlink/af_netlink.c:1904 sock_sendmsg_nosec net/socket.c:702 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:722 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2385 ___sys_sendmsg+0xf3/0x170 net/socket.c:2439 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2468 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: 0033:0x4665d9 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:00007fb18e91c188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000005 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 0000000000a9fb1f R14: 00007fb18e91c300 R15: 0000000000022000 netlink: 'syz-executor.0': attribute type 11 has an invalid length. netlink: 209848 bytes leftover after parsing attributes in process `syz-executor.0'. ieee80211 phy5: Selected rate control algorithm 'minstrel_ht'