====================================================== WARNING: possible circular locking dependency detected 5.14.0-rc1-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/8444 is trying to acquire lock: ffffffff8c7d6b20 (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 stack_depot_save+0x361/0x490 lib/stackdepot.c:303 kasan_save_stack+0x3e/0x50 mm/kasan/common.c:40 kasan_record_aux_stack+0xee/0x120 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3029 [inline] call_rcu+0x1a0/0xa20 kernel/rcu/tree.c:3109 context_switch kernel/sched/core.c:4686 [inline] __schedule+0xc0f/0x11f0 kernel/sched/core.c:5940 preempt_schedule_notrace+0x12c/0x170 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+0xa1/0x150 include/trace/events/lock.h:58 lock_release+0x81/0x7b0 kernel/locking/lockdep.c:5636 fs_reclaim_release mm/page_alloc.c:4583 [inline] prepare_alloc_pages+0x1a4/0x5a0 mm/page_alloc.c:5165 __alloc_pages+0x14d/0x5f0 mm/page_alloc.c:5363 __get_free_pages+0x8/0x30 mm/page_alloc.c:5411 _pgd_alloc arch/x86/mm/pgtable.c:414 [inline] pgd_alloc+0x1e/0x1c0 arch/x86/mm/pgtable.c:430 mm_alloc_pgd kernel/fork.c:628 [inline] mm_init+0x502/0x840 kernel/fork.c:1062 bprm_mm_init fs/exec.c:366 [inline] alloc_bprm+0x1ef/0x3b0 fs/exec.c:1521 kernel_execve+0x49/0x9a0 fs/exec.c:1941 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_user+0x70/0x80 mm/vmalloc.c:3101 kcov_mmap+0x28/0x130 kernel/kcov.c:465 call_mmap include/linux/fs.h:2119 [inline] mmap_region+0x1410/0x1df0 mm/mmap.c:1808 do_mmap+0x89e/0x10c0 mm/mmap.c:1584 vm_mmap_pgoff+0x19e/0x2b0 mm/util.c:519 ksys_mmap_pgoff+0x504/0x7b0 mm/mmap.c:1635 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.0/8444: #0: ffff88803174a428 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline] #0: ffff88803174a428 (&mm->mmap_lock#2){++++}-{3:3}, at: vm_mmap_pgoff+0x14d/0x2b0 mm/util.c:517 #1: ffff8880b9d4d0c8 (lock#2){-.-.}-{2:2}, at: local_lock_acquire+0x7/0x130 include/linux/local_lock_internal.h:41 stack backtrace: CPU: 1 PID: 8444 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+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_user+0x70/0x80 mm/vmalloc.c:3101 kcov_mmap+0x28/0x130 kernel/kcov.c:465 call_mmap include/linux/fs.h:2119 [inline] mmap_region+0x1410/0x1df0 mm/mmap.c:1808 do_mmap+0x89e/0x10c0 mm/mmap.c:1584 vm_mmap_pgoff+0x19e/0x2b0 mm/util.c:519 ksys_mmap_pgoff+0x504/0x7b0 mm/mmap.c:1635 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: 0033:0x466622 Code: 00 00 00 00 00 0f 1f 00 41 f7 c1 ff 0f 00 00 75 27 55 48 89 fd 53 89 cb 48 85 ff 74 3b 41 89 da 48 89 ef b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 66 5b 5d c3 0f 1f 00 48 c7 c0 bc ff ff ff 64 RSP: 002b:00007ffd98269f48 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000466622 RDX: 0000000000000003 RSI: 0000000000200000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 00000000000000e8 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000246 R12: 000000000056c0c0 R13: 000000000056cb88 R14: 0000000000000000 R15: 00000000000000e9 BUG: sleeping function called from invalid context at mm/page_alloc.c:5167 in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 8444, name: syz-executor.0 INFO: lockdep is turned off. irq event stamp: 3228 hardirqs last enabled at (3227): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (3227): [] _raw_spin_unlock_irqrestore+0x8b/0x120 kernel/locking/spinlock.c:191 hardirqs last disabled at (3228): [] __alloc_pages_bulk+0x801/0x1090 mm/page_alloc.c:5279 softirqs last enabled at (2498): [] invoke_softirq kernel/softirq.c:432 [inline] softirqs last enabled at (2498): [] __irq_exit_rcu+0x21b/0x260 kernel/softirq.c:636 softirqs last disabled at (2493): [] invoke_softirq kernel/softirq.c:432 [inline] softirqs last disabled at (2493): [] __irq_exit_rcu+0x21b/0x260 kernel/softirq.c:636 CPU: 1 PID: 8444 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+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_user+0x70/0x80 mm/vmalloc.c:3101 kcov_mmap+0x28/0x130 kernel/kcov.c:465 call_mmap include/linux/fs.h:2119 [inline] mmap_region+0x1410/0x1df0 mm/mmap.c:1808 do_mmap+0x89e/0x10c0 mm/mmap.c:1584 vm_mmap_pgoff+0x19e/0x2b0 mm/util.c:519 ksys_mmap_pgoff+0x504/0x7b0 mm/mmap.c:1635 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: 0033:0x466622 Code: 00 00 00 00 00 0f 1f 00 41 f7 c1 ff 0f 00 00 75 27 55 48 89 fd 53 89 cb 48 85 ff 74 3b 41 89 da 48 89 ef b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 66 5b 5d c3 0f 1f 00 48 c7 c0 bc ff ff ff 64 RSP: 002b:00007ffd98269f48 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000466622 RDX: 0000000000000003 RSI: 0000000000200000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 00000000000000e8 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000246 R12: 000000000056c0c0 R13: 000000000056cb88 R14: 0000000000000000 R15: 00000000000000e9