[syzbot] net test error: possible deadlock in fs_reclaim_acquire

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Hello,

syzbot found the following issue on:

HEAD commit:    ccd27f05 ipv6: fix 'disable_policy' for fwd packets
git tree:       net
console output: https://syzkaller.appspot.com/x/log.txt?x=1785e6b0300000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4dab7ebc24619f37
dashboard link: https://syzkaller.appspot.com/bug?extid=c453e1328dbf23580e9e

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c453e1328dbf23580e9e@xxxxxxxxxxxxxxxxxxxxxxxxx

======================================================
WARNING: possible circular locking dependency detected
5.13.0-syzkaller #0 Not tainted
------------------------------------------------------
syz-fuzzer/8439 is trying to acquire lock:
ffffffff8ba9c1c0 (fs_reclaim){+.+.}-{0:0}, at: fs_reclaim_acquire+0xf7/0x160 mm/page_alloc.c:4586

but task is already holding lock:
ffff8880b9d4d620 (lock#2){-.-.}-{2:2}, at: __alloc_pages_bulk+0x4ad/0x1870 mm/page_alloc.c:5291

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (lock#2){-.-.}-{2:2}:
       local_lock_acquire include/linux/local_lock_internal.h:42 [inline]
       free_unref_page+0x1bf/0x690 mm/page_alloc.c:3439
       mm_free_pgd kernel/fork.c:636 [inline]
       __mmdrop+0xcb/0x3f0 kernel/fork.c:687
       mmdrop include/linux/sched/mm.h:49 [inline]
       finish_task_switch.isra.0+0x6da/0xa50 kernel/sched/core.c:4582
       context_switch kernel/sched/core.c:4686 [inline]
       __schedule+0x93c/0x2710 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_acquire include/trace/events/lock.h:13 [inline]
       lock_acquire+0x461/0x510 kernel/locking/lockdep.c:5596
       fs_reclaim_acquire mm/page_alloc.c:4581 [inline]
       fs_reclaim_acquire+0xd2/0x160 mm/page_alloc.c:4572
       might_alloc include/linux/sched/mm.h:198 [inline]
       slab_pre_alloc_hook mm/slab.h:485 [inline]
       slab_alloc_node mm/slub.c:2891 [inline]
       slab_alloc mm/slub.c:2978 [inline]
       kmem_cache_alloc+0x3e/0x4a0 mm/slub.c:2983
       getname_flags.part.0+0x50/0x4f0 fs/namei.c:138
       getname_flags fs/namei.c:2734 [inline]
       user_path_at_empty+0xa1/0x100 fs/namei.c:2734
       user_path_at include/linux/namei.h:60 [inline]
       do_faccessat+0x127/0x850 fs/open.c:425
       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

-> #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:4564 [inline]
       fs_reclaim_acquire+0x117/0x160 mm/page_alloc.c:4578
       prepare_alloc_pages+0x15c/0x580 mm/page_alloc.c:5176
       __alloc_pages+0x12f/0x500 mm/page_alloc.c:5375
       alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2272
       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:2445 [inline]
       __alloc_pages_bulk+0x8b9/0x1870 mm/page_alloc.c:5313
       alloc_pages_bulk_array_node include/linux/gfp.h:557 [inline]
       vm_area_alloc_pages mm/vmalloc.c:2775 [inline]
       __vmalloc_area_node mm/vmalloc.c:2845 [inline]
       __vmalloc_node_range+0x39d/0x960 mm/vmalloc.c:2947
       vmalloc_user+0x67/0x80 mm/vmalloc.c:3082
       kcov_mmap+0x2b/0x140 kernel/kcov.c:465
       call_mmap include/linux/fs.h:2119 [inline]
       mmap_region+0xcde/0x1760 mm/mmap.c:1809
       do_mmap+0x86e/0x11d0 mm/mmap.c:1585
       vm_mmap_pgoff+0x1b7/0x290 mm/util.c:519
       ksys_mmap_pgoff+0x4a8/0x620 mm/mmap.c:1636
       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:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(lock#2);
                               lock(fs_reclaim);
                               lock(lock#2);
  lock(fs_reclaim);

 *** DEADLOCK ***

2 locks held by syz-fuzzer/8439:
 #0: ffff888030c74028 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline]
 #0: ffff888030c74028 (&mm->mmap_lock#2){++++}-{3:3}, at: vm_mmap_pgoff+0x15c/0x290 mm/util.c:517
 #1: ffff8880b9d4d620 (lock#2){-.-.}-{2:2}, at: __alloc_pages_bulk+0x4ad/0x1870 mm/page_alloc.c:5291

stack backtrace:
CPU: 1 PID: 8439 Comm: syz-fuzzer Not tainted 5.13.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:96
 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:4564 [inline]
 fs_reclaim_acquire+0x117/0x160 mm/page_alloc.c:4578
 prepare_alloc_pages+0x15c/0x580 mm/page_alloc.c:5176
 __alloc_pages+0x12f/0x500 mm/page_alloc.c:5375
 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2272
 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:2445 [inline]
 __alloc_pages_bulk+0x8b9/0x1870 mm/page_alloc.c:5313
 alloc_pages_bulk_array_node include/linux/gfp.h:557 [inline]
 vm_area_alloc_pages mm/vmalloc.c:2775 [inline]
 __vmalloc_area_node mm/vmalloc.c:2845 [inline]
 __vmalloc_node_range+0x39d/0x960 mm/vmalloc.c:2947
 vmalloc_user+0x67/0x80 mm/vmalloc.c:3082
 kcov_mmap+0x2b/0x140 kernel/kcov.c:465
 call_mmap include/linux/fs.h:2119 [inline]
 mmap_region+0xcde/0x1760 mm/mmap.c:1809
 do_mmap+0x86e/0x11d0 mm/mmap.c:1585
 vm_mmap_pgoff+0x1b7/0x290 mm/util.c:519
 ksys_mmap_pgoff+0x4a8/0x620 mm/mmap.c:1636
 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: 0033:0x4af20a
Code: e8 3b 82 fb ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 4c 8b 54 24 28 4c 8b 44 24 30 4c 8b 4c 24 38 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 40 ff ff ff ff 48 c7 44 24 48
RSP: 002b:000000c0002ef5d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 000000c00001e800 RCX: 00000000004af20a
RDX: 0000000000000003 RSI: 0000000000080000 RDI: 0000000000000000
RBP: 000000c0002ef638 R08: 0000000000000006 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000212 R12: 00000000007798c5
R13: 00000000000000d4 R14: 00000000000000d3 R15: 0000000000000100
BUG: sleeping function called from invalid context at mm/page_alloc.c:5179
in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 8439, name: syz-fuzzer
INFO: lockdep is turned off.
irq event stamp: 30266
hardirqs last  enabled at (30265): [<ffffffff892271f0>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
hardirqs last  enabled at (30265): [<ffffffff892271f0>] _raw_spin_unlock_irqrestore+0x50/0x70 kernel/locking/spinlock.c:191
hardirqs last disabled at (30266): [<ffffffff81b21da7>] __alloc_pages_bulk+0x1017/0x1870 mm/page_alloc.c:5291
softirqs last  enabled at (29546): [<ffffffff8146345e>] invoke_softirq kernel/softirq.c:432 [inline]
softirqs last  enabled at (29546): [<ffffffff8146345e>] __irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636
softirqs last disabled at (29535): [<ffffffff8146345e>] invoke_softirq kernel/softirq.c:432 [inline]
softirqs last disabled at (29535): [<ffffffff8146345e>] __irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636
CPU: 1 PID: 8439 Comm: syz-fuzzer Not tainted 5.13.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:96
 ___might_sleep.cold+0x1f1/0x237 kernel/sched/core.c:9153
 prepare_alloc_pages+0x3da/0x580 mm/page_alloc.c:5179
 __alloc_pages+0x12f/0x500 mm/page_alloc.c:5375
 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2272
 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:2445 [inline]
 __alloc_pages_bulk+0x8b9/0x1870 mm/page_alloc.c:5313
 alloc_pages_bulk_array_node include/linux/gfp.h:557 [inline]
 vm_area_alloc_pages mm/vmalloc.c:2775 [inline]
 __vmalloc_area_node mm/vmalloc.c:2845 [inline]
 __vmalloc_node_range+0x39d/0x960 mm/vmalloc.c:2947
 vmalloc_user+0x67/0x80 mm/vmalloc.c:3082
 kcov_mmap+0x2b/0x140 kernel/kcov.c:465
 call_mmap include/linux/fs.h:2119 [inline]
 mmap_region+0xcde/0x1760 mm/mmap.c:1809
 do_mmap+0x86e/0x11d0 mm/mmap.c:1585
 vm_mmap_pgoff+0x1b7/0x290 mm/util.c:519
 ksys_mmap_pgoff+0x4a8/0x620 mm/mmap.c:1636
 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: 0033:0x4af20a
Code: e8 3b 82 fb ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 4c 8b 54 24 28 4c 8b 44 24 30 4c 8b 4c 24 38 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 40 ff ff ff ff 48 c7 44 24 48
RSP: 002b:000000c0002ef5d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 000000c00001e800 RCX: 00000000004af20a
RDX: 0000000000000003 RSI: 0000000000080000 RDI: 0000000000000000
RBP: 000000c0002ef638 R08: 0000000000000006 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000212 R12: 00000000007798c5
R13: 00000000000000d4 R14: 00000000000000d3 R15: 0000000000000100


---
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