====================================================== WARNING: possible circular locking dependency detected 5.14.0-rc1-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/17389 is trying to acquire lock: ffffffff8c7d6aa0 (fs_reclaim){+.+.}-{0:0}, at: __fs_reclaim_acquire+0x0/0x30 mm/page_alloc.c:4210 but task is already holding lock: ffff8880b9d4d0c8 (lock#2){..-.}-{2:2}, at: local_lock_acquire+0x7/0x130 include/linux/local_lock_internal.h:41 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (lock#2){..-.}-{2:2}: lock_acquire+0x182/0x4a0 kernel/locking/lockdep.c:5625 local_lock_acquire+0x23/0x130 include/linux/local_lock_internal.h:42 rmqueue_pcplist+0x10c/0x4d0 mm/page_alloc.c:3663 rmqueue+0x1eb4/0x22e0 mm/page_alloc.c:3701 get_page_from_freelist+0x4b3/0xa30 mm/page_alloc.c:4163 __alloc_pages+0x26c/0x5f0 mm/page_alloc.c:5374 alloc_slab_page mm/slub.c:1713 [inline] allocate_slab+0xf1/0x540 mm/slub.c:1853 new_slab mm/slub.c:1916 [inline] new_slab_objects mm/slub.c:2662 [inline] ___slab_alloc+0x1cf/0x350 mm/slub.c:2825 __slab_alloc mm/slub.c:2865 [inline] slab_alloc_node mm/slub.c:2947 [inline] slab_alloc mm/slub.c:2989 [inline] kmem_cache_alloc+0x299/0x340 mm/slub.c:2994 kmem_cache_zalloc include/linux/slab.h:711 [inline] fill_pool lib/debugobjects.c:171 [inline] __debug_object_init+0x1520/0x1880 lib/debugobjects.c:560 debug_object_init lib/debugobjects.c:615 [inline] debug_object_activate+0x188/0x6a0 lib/debugobjects.c:701 debug_rcu_head_queue kernel/rcu/rcu.h:176 [inline] __call_rcu kernel/rcu/tree.c:3013 [inline] call_rcu+0x93/0xa20 kernel/rcu/tree.c:3109 context_switch kernel/sched/core.c:4686 [inline] __schedule+0xc0f/0x11f0 kernel/sched/core.c:5940 preempt_schedule_irq+0xe3/0x190 kernel/sched/core.c:6328 irqentry_exit+0x56/0x90 kernel/entry/common.c:427 asm_sysvec_reschedule_ipi+0x12/0x20 arch/x86/include/asm/idtentry.h:643 lock_acquire+0x1e7/0x4a0 kernel/locking/lockdep.c:5629 __fs_reclaim_acquire+0x20/0x30 mm/page_alloc.c:4552 fs_reclaim_acquire+0x59/0xf0 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+0x3a/0x340 mm/slub.c:2994 prepare_creds+0x3d/0x640 kernel/cred.c:262 prepare_exec_creds+0x14/0x260 kernel/cred.c:313 prepare_bprm_creds fs/exec.c:1467 [inline] bprm_execve+0xf9/0x1470 fs/exec.c:1799 kernel_execve+0x8ce/0x9a0 fs/exec.c:1974 call_usermodehelper_exec_async+0x262/0x3b0 kernel/umh.c:112 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+0x4f9/0x5b30 kernel/locking/lockdep.c:3174 validate_chain kernel/locking/lockdep.c:3789 [inline] __lock_acquire+0x4476/0x6100 kernel/locking/lockdep.c:5015 lock_acquire+0x182/0x4a0 kernel/locking/lockdep.c:5625 __fs_reclaim_acquire+0x20/0x30 mm/page_alloc.c:4552 fs_reclaim_acquire+0x59/0xf0 mm/page_alloc.c:4566 prepare_alloc_pages+0x151/0x5a0 mm/page_alloc.c:5164 __alloc_pages+0x14d/0x5f0 mm/page_alloc.c:5363 stack_depot_save+0x361/0x490 lib/stackdepot.c:303 save_stack+0xf9/0x1f0 mm/page_owner.c:120 __set_page_owner+0x42/0x2f0 mm/page_owner.c:181 prep_new_page mm/page_alloc.c:2433 [inline] __alloc_pages_bulk+0x9f2/0x1090 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+0x3ad/0x7f0 mm/vmalloc.c:2966 __vmalloc_node mm/vmalloc.c:3015 [inline] __vmalloc_area_node mm/vmalloc.c:2846 [inline] __vmalloc_node_range+0x274/0x7f0 mm/vmalloc.c:2966 __vmalloc_node mm/vmalloc.c:3015 [inline] vmalloc+0x75/0x80 mm/vmalloc.c:3048 htable_create net/netfilter/xt_hashlimit.c:298 [inline] hashlimit_mt_check_common+0x897/0x1300 net/netfilter/xt_hashlimit.c:898 hashlimit_mt_check_v2+0x2f8/0x4c0 net/netfilter/xt_hashlimit.c:942 xt_check_match+0x336/0xcf0 net/netfilter/x_tables.c:509 check_match net/ipv6/netfilter/ip6_tables.c:489 [inline] find_check_match net/ipv6/netfilter/ip6_tables.c:506 [inline] find_check_entry net/ipv6/netfilter/ip6_tables.c:557 [inline] translate_table+0x16cd/0x2410 net/ipv6/netfilter/ip6_tables.c:734 do_replace net/ipv6/netfilter/ip6_tables.c:1152 [inline] do_ip6t_set_ctl+0x2c31/0x3d90 net/ipv6/netfilter/ip6_tables.c:1638 nf_setsockopt+0x29f/0x2d0 net/netfilter/nf_sockopt.c:101 ipv6_setsockopt+0x4685/0x5770 net/ipv6/ipv6_sockglue.c:1008 rawv6_setsockopt+0x2b9/0x6e0 net/ipv6/raw.c:1081 __sys_setsockopt+0x552/0x980 net/socket.c:2159 __do_sys_setsockopt net/socket.c:2170 [inline] __se_sys_setsockopt net/socket.c:2167 [inline] __x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2167 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(lock#2); lock(fs_reclaim); lock(lock#2); lock(fs_reclaim); *** DEADLOCK *** 2 locks held by syz-executor.3/17389: #0: ffffffff8d7da6c8 (hashlimit_mutex){+.+.}-{3:3}, at: hashlimit_mt_check_common+0x656/0x1300 net/netfilter/xt_hashlimit.c:895 #1: ffff8880b9d4d0c8 (lock#2){..-.}-{2:2}, at: local_lock_acquire+0x7/0x130 include/linux/local_lock_internal.h:41 stack backtrace: CPU: 1 PID: 17389 Comm: syz-executor.3 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+0x1ae/0x29f lib/dump_stack.c:105 print_circular_bug+0xb17/0xdc0 kernel/locking/lockdep.c:2009 check_noncircular+0x2cc/0x390 kernel/locking/lockdep.c:2131 check_prev_add kernel/locking/lockdep.c:3051 [inline] check_prevs_add+0x4f9/0x5b30 kernel/locking/lockdep.c:3174 validate_chain kernel/locking/lockdep.c:3789 [inline] __lock_acquire+0x4476/0x6100 kernel/locking/lockdep.c:5015 lock_acquire+0x182/0x4a0 kernel/locking/lockdep.c:5625 __fs_reclaim_acquire+0x20/0x30 mm/page_alloc.c:4552 fs_reclaim_acquire+0x59/0xf0 mm/page_alloc.c:4566 prepare_alloc_pages+0x151/0x5a0 mm/page_alloc.c:5164 __alloc_pages+0x14d/0x5f0 mm/page_alloc.c:5363 stack_depot_save+0x361/0x490 lib/stackdepot.c:303 save_stack+0xf9/0x1f0 mm/page_owner.c:120 __set_page_owner+0x42/0x2f0 mm/page_owner.c:181 prep_new_page mm/page_alloc.c:2433 [inline] __alloc_pages_bulk+0x9f2/0x1090 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+0x3ad/0x7f0 mm/vmalloc.c:2966 __vmalloc_node mm/vmalloc.c:3015 [inline] __vmalloc_area_node mm/vmalloc.c:2846 [inline] __vmalloc_node_range+0x274/0x7f0 mm/vmalloc.c:2966 __vmalloc_node mm/vmalloc.c:3015 [inline] vmalloc+0x75/0x80 mm/vmalloc.c:3048 htable_create net/netfilter/xt_hashlimit.c:298 [inline] hashlimit_mt_check_common+0x897/0x1300 net/netfilter/xt_hashlimit.c:898 hashlimit_mt_check_v2+0x2f8/0x4c0 net/netfilter/xt_hashlimit.c:942 xt_check_match+0x336/0xcf0 net/netfilter/x_tables.c:509 check_match net/ipv6/netfilter/ip6_tables.c:489 [inline] find_check_match net/ipv6/netfilter/ip6_tables.c:506 [inline] find_check_entry net/ipv6/netfilter/ip6_tables.c:557 [inline] translate_table+0x16cd/0x2410 net/ipv6/netfilter/ip6_tables.c:734 do_replace net/ipv6/netfilter/ip6_tables.c:1152 [inline] do_ip6t_set_ctl+0x2c31/0x3d90 net/ipv6/netfilter/ip6_tables.c:1638 nf_setsockopt+0x29f/0x2d0 net/netfilter/nf_sockopt.c:101 ipv6_setsockopt+0x4685/0x5770 net/ipv6/ipv6_sockglue.c:1008 rawv6_setsockopt+0x2b9/0x6e0 net/ipv6/raw.c:1081 __sys_setsockopt+0x552/0x980 net/socket.c:2159 __do_sys_setsockopt net/socket.c:2170 [inline] __se_sys_setsockopt net/socket.c:2167 [inline] __x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2167 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/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:00007f4115ca3188 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000008 RBP: 00000000004bfcb9 R08: 0000000000000001 R09: 0000000000000000 R10: 00000000200009c0 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007fffc8abd56f R14: 00007f4115ca3300 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: 17389, name: syz-executor.3 INFO: lockdep is turned off. irq event stamp: 716 hardirqs last enabled at (715): [] asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 hardirqs last disabled at (716): [] __alloc_pages_bulk+0x801/0x1090 mm/page_alloc.c:5279 softirqs last enabled at (416): [] do_ipv6_setsockopt net/ipv6/ipv6_sockglue.c:979 [inline] softirqs last enabled at (416): [] ipv6_setsockopt+0x4602/0x5770 net/ipv6/ipv6_sockglue.c:1003 softirqs last disabled at (414): [] spin_lock_bh include/linux/spinlock.h:359 [inline] softirqs last disabled at (414): [] release_sock+0x2c/0x1c0 net/core/sock.c:3177 CPU: 1 PID: 17389 Comm: syz-executor.3 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+0x1ae/0x29f lib/dump_stack.c:105 ___might_sleep+0x4e5/0x6b0 kernel/sched/core.c:9154 prepare_alloc_pages+0x1c0/0x5a0 mm/page_alloc.c:5167 __alloc_pages+0x14d/0x5f0 mm/page_alloc.c:5363 stack_depot_save+0x361/0x490 lib/stackdepot.c:303 save_stack+0xf9/0x1f0 mm/page_owner.c:120 __set_page_owner+0x42/0x2f0 mm/page_owner.c:181 prep_new_page mm/page_alloc.c:2433 [inline] __alloc_pages_bulk+0x9f2/0x1090 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+0x3ad/0x7f0 mm/vmalloc.c:2966 __vmalloc_node mm/vmalloc.c:3015 [inline] __vmalloc_area_node mm/vmalloc.c:2846 [inline] __vmalloc_node_range+0x274/0x7f0 mm/vmalloc.c:2966 __vmalloc_node mm/vmalloc.c:3015 [inline] vmalloc+0x75/0x80 mm/vmalloc.c:3048 htable_create net/netfilter/xt_hashlimit.c:298 [inline] hashlimit_mt_check_common+0x897/0x1300 net/netfilter/xt_hashlimit.c:898 hashlimit_mt_check_v2+0x2f8/0x4c0 net/netfilter/xt_hashlimit.c:942 xt_check_match+0x336/0xcf0 net/netfilter/x_tables.c:509 check_match net/ipv6/netfilter/ip6_tables.c:489 [inline] find_check_match net/ipv6/netfilter/ip6_tables.c:506 [inline] find_check_entry net/ipv6/netfilter/ip6_tables.c:557 [inline] translate_table+0x16cd/0x2410 net/ipv6/netfilter/ip6_tables.c:734 do_replace net/ipv6/netfilter/ip6_tables.c:1152 [inline] do_ip6t_set_ctl+0x2c31/0x3d90 net/ipv6/netfilter/ip6_tables.c:1638 nf_setsockopt+0x29f/0x2d0 net/netfilter/nf_sockopt.c:101 ipv6_setsockopt+0x4685/0x5770 net/ipv6/ipv6_sockglue.c:1008 rawv6_setsockopt+0x2b9/0x6e0 net/ipv6/raw.c:1081 __sys_setsockopt+0x552/0x980 net/socket.c:2159 __do_sys_setsockopt net/socket.c:2170 [inline] __se_sys_setsockopt net/socket.c:2167 [inline] __x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2167 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/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:00007f4115ca3188 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000008 RBP: 00000000004bfcb9 R08: 0000000000000001 R09: 0000000000000000 R10: 00000000200009c0 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007fffc8abd56f R14: 00007f4115ca3300 R15: 0000000000022000 x_tables: ip6_tables: CLASSIFY target: used from hooks PREROUTING, but only usable from FORWARD/OUTPUT/POSTROUTING syz-executor.3 (17389) used greatest stack depth: 17400 bytes left