====================================================== WARNING: possible circular locking dependency detected 5.14.0-rc1-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.2/8839 is trying to acquire lock: ffffffff8ac86c80 (fs_reclaim){+.+.}-{0:0}, at: fs_reclaim_acquire+0xf7/0x160 mm/page_alloc.c:4574 but task is already holding lock: ffff8880b9e4d540 (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] free_unref_page+0x1bf/0x690 mm/page_alloc.c:3427 mm_free_pgd kernel/fork.c:636 [inline] __mmdrop+0xb9/0x350 kernel/fork.c:687 mmdrop include/linux/sched/mm.h:49 [inline] finish_task_switch.isra.0+0x69f/0xa10 kernel/sched/core.c:4582 context_switch kernel/sched/core.c:4686 [inline] __schedule+0x90f/0x26b0 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:198 [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+0x5a/0x4d0 mm/slab.c:3711 lsm_cred_alloc security/security.c:536 [inline] security_prepare_creds+0xb9/0x130 security/security.c:1690 prepare_creds+0x3d0/0x610 kernel/cred.c:289 access_override_creds fs/open.c:355 [inline] do_faccessat+0x273/0x660 fs/open.c:419 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 (mmu_notifier_invalidate_range_start){+.+.}-{0:0}: 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 mm/slab.c:3306 [inline] kmem_cache_alloc_trace+0x39/0x480 mm/slab.c:3573 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] alloc_workqueue_attrs+0x33/0x70 kernel/workqueue.c:3365 wq_numa_init kernel/workqueue.c:5899 [inline] workqueue_init+0x67/0x7d6 kernel/workqueue.c:6031 kernel_init_freeable+0x337/0x60c init/main.c:1577 kernel_init+0x14/0x120 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+0x2985/0x5410 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 stack_depot_save+0x39d/0x4e0 lib/stackdepot.c:303 save_stack+0x131/0x1a0 mm/page_owner.c:120 __set_page_owner+0x2e/0x250 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+0x2f6/0x7e0 mm/vmalloc.c:2966 __vmalloc_node mm/vmalloc.c:3015 [inline] __vmalloc+0x63/0x90 mm/vmalloc.c:3029 pcpu_alloc_chunk mm/percpu.c:1455 [inline] pcpu_create_chunk+0xc6/0x6b0 mm/percpu-vm.c:338 pcpu_alloc+0xb75/0xe30 mm/percpu.c:1838 xt_percpu_counter_alloc+0xee/0x170 net/netfilter/x_tables.c:1869 find_check_entry.constprop.0+0xa3/0x920 net/ipv4/netfilter/ip_tables.c:527 translate_table+0xba8/0x1700 net/ipv4/netfilter/ip_tables.c:717 ipt_register_table+0x10b/0x320 net/ipv4/netfilter/ip_tables.c:1736 iptable_nat_table_init+0x3d/0x360 net/ipv4/netfilter/iptable_nat.c:125 xt_find_table_lock+0x34e/0x7f0 net/netfilter/x_tables.c:1244 xt_request_find_table_lock+0x17/0xa0 net/netfilter/x_tables.c:1275 get_info+0x128/0x5f0 net/ipv6/netfilter/ip6_tables.c:980 do_ipt_get_ctl+0x122/0x7c0 net/ipv4/netfilter/ip_tables.c:1653 nf_getsockopt+0x57/0xb0 net/netfilter/nf_sockopt.c:116 ip_getsockopt net/ipv4/ip_sockglue.c:1777 [inline] ip_getsockopt+0xec/0x130 net/ipv4/ip_sockglue.c:1756 __sys_getsockopt+0x1a8/0x550 net/socket.c:2203 __do_sys_getsockopt net/socket.c:2218 [inline] __se_sys_getsockopt net/socket.c:2215 [inline] __x64_sys_getsockopt+0xb5/0x150 net/socket.c:2215 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 --> mmu_notifier_invalidate_range_start --> lock#2 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(lock#2); lock(mmu_notifier_invalidate_range_start); lock(lock#2); lock(fs_reclaim); *** DEADLOCK *** 2 locks held by syz-executor.2/8839: #0: ffffffff8ac67808 (pcpu_alloc_mutex){+.+.}-{3:3}, at: pcpu_alloc+0x7f7/0xe30 mm/percpu.c:1778 #1: ffff8880b9e4d540 (lock#2){-.-.}-{2:2}, at: __alloc_pages_bulk+0x4ad/0x1870 mm/page_alloc.c:5279 stack backtrace: CPU: 0 PID: 8839 Comm: syz-executor.2 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+0x57/0x7d 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+0x2985/0x5410 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 stack_depot_save+0x39d/0x4e0 lib/stackdepot.c:303 save_stack+0x131/0x1a0 mm/page_owner.c:120 __set_page_owner+0x2e/0x250 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+0x2f6/0x7e0 mm/vmalloc.c:2966 __vmalloc_node mm/vmalloc.c:3015 [inline] __vmalloc+0x63/0x90 mm/vmalloc.c:3029 pcpu_alloc_chunk mm/percpu.c:1455 [inline] pcpu_create_chunk+0xc6/0x6b0 mm/percpu-vm.c:338 pcpu_alloc+0xb75/0xe30 mm/percpu.c:1838 xt_percpu_counter_alloc+0xee/0x170 net/netfilter/x_tables.c:1869 find_check_entry.constprop.0+0xa3/0x920 net/ipv4/netfilter/ip_tables.c:527 translate_table+0xba8/0x1700 net/ipv4/netfilter/ip_tables.c:717 ipt_register_table+0x10b/0x320 net/ipv4/netfilter/ip_tables.c:1736 iptable_nat_table_init+0x3d/0x360 net/ipv4/netfilter/iptable_nat.c:125 xt_find_table_lock+0x34e/0x7f0 net/netfilter/x_tables.c:1244 xt_request_find_table_lock+0x17/0xa0 net/netfilter/x_tables.c:1275 get_info+0x128/0x5f0 net/ipv6/netfilter/ip6_tables.c:980 do_ipt_get_ctl+0x122/0x7c0 net/ipv4/netfilter/ip_tables.c:1653 nf_getsockopt+0x57/0xb0 net/netfilter/nf_sockopt.c:116 ip_getsockopt net/ipv4/ip_sockglue.c:1777 [inline] ip_getsockopt+0xec/0x130 net/ipv4/ip_sockglue.c:1756 __sys_getsockopt+0x1a8/0x550 net/socket.c:2203 __do_sys_getsockopt net/socket.c:2218 [inline] __se_sys_getsockopt net/socket.c:2215 [inline] __x64_sys_getsockopt+0xb5/0x150 net/socket.c:2215 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: 0033:0x467c0a Code: 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 37 00 00 00 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:00007ffec46c3758 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000467c0a RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000000003 R08: 00007ffec46c378c R09: 0000000000000278 R10: 00000000005443c8 R11: 0000000000000246 R12: 00007ffec46c378c R13: 00000000004c8cf7 R14: 00000000005443c8 R15: 00000000005443c0 BUG: sleeping function called from invalid context at mm/page_alloc.c:5167 in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 8839, name: syz-executor.2 INFO: lockdep is turned off. irq event stamp: 175760 hardirqs last enabled at (175759): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (175759): [] _raw_spin_unlock_irqrestore+0x50/0x70 kernel/locking/spinlock.c:191 hardirqs last disabled at (175760): [] __alloc_pages_bulk+0x1017/0x1870 mm/page_alloc.c:5279 softirqs last enabled at (175722): [] do_ip_getsockopt+0x39e/0x1420 net/ipv4/ip_sockglue.c:1728 softirqs last disabled at (175720): [] spin_lock_bh include/linux/spinlock.h:359 [inline] softirqs last disabled at (175720): [] release_sock+0x16/0x170 net/core/sock.c:3177 CPU: 0 PID: 8839 Comm: syz-executor.2 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+0x57/0x7d 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 stack_depot_save+0x39d/0x4e0 lib/stackdepot.c:303 save_stack+0x131/0x1a0 mm/page_owner.c:120 __set_page_owner+0x2e/0x250 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+0x2f6/0x7e0 mm/vmalloc.c:2966 __vmalloc_node mm/vmalloc.c:3015 [inline] __vmalloc+0x63/0x90 mm/vmalloc.c:3029 pcpu_alloc_chunk mm/percpu.c:1455 [inline] pcpu_create_chunk+0xc6/0x6b0 mm/percpu-vm.c:338 pcpu_alloc+0xb75/0xe30 mm/percpu.c:1838 xt_percpu_counter_alloc+0xee/0x170 net/netfilter/x_tables.c:1869 find_check_entry.constprop.0+0xa3/0x920 net/ipv4/netfilter/ip_tables.c:527 translate_table+0xba8/0x1700 net/ipv4/netfilter/ip_tables.c:717 ipt_register_table+0x10b/0x320 net/ipv4/netfilter/ip_tables.c:1736 iptable_nat_table_init+0x3d/0x360 net/ipv4/netfilter/iptable_nat.c:125 xt_find_table_lock+0x34e/0x7f0 net/netfilter/x_tables.c:1244 xt_request_find_table_lock+0x17/0xa0 net/netfilter/x_tables.c:1275 get_info+0x128/0x5f0 net/ipv6/netfilter/ip6_tables.c:980 do_ipt_get_ctl+0x122/0x7c0 net/ipv4/netfilter/ip_tables.c:1653 nf_getsockopt+0x57/0xb0 net/netfilter/nf_sockopt.c:116 ip_getsockopt net/ipv4/ip_sockglue.c:1777 [inline] ip_getsockopt+0xec/0x130 net/ipv4/ip_sockglue.c:1756 __sys_getsockopt+0x1a8/0x550 net/socket.c:2203 __do_sys_getsockopt net/socket.c:2218 [inline] __se_sys_getsockopt net/socket.c:2215 [inline] __x64_sys_getsockopt+0xb5/0x150 net/socket.c:2215 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: 0033:0x467c0a Code: 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 37 00 00 00 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:00007ffec46c3758 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000467c0a RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000000003 R08: 00007ffec46c378c R09: 0000000000000278 R10: 00000000005443c8 R11: 0000000000000246 R12: 00007ffec46c378c R13: 00000000004c8cf7 R14: 00000000005443c8 R15: 00000000005443c0