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Subject[syzbot] possible deadlock in fs_reclaim_acquire (3)
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Hello,

syzbot found the following issue on:

HEAD commit: 3dbdb38e Merge branch 'for-5.14' of git://git.kernel.org/p..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1156c149d00000
kernel config: https://syzkaller.appspot.com/x/.config?x=90b227e3653ac0d7
dashboard link: https://syzkaller.appspot.com/bug?extid=e4297c8090dc600ba884
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10613b94300000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e4297c8090dc600ba884@syzkaller.appspotmail.com

======================================================
WARNING: possible circular locking dependency detected
5.13.0-syzkaller #0 Not tainted
------------------------------------------------------
syz-execprog/8452 is trying to acquire lock:
ffffffff8c297880 (fs_reclaim){+.+.}-{0:0}, at: fs_reclaim_acquire+0xf7/0x160 mm/page_alloc.c:4586

but task is already holding lock:
ffff8880b9d31620 (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:

-> #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: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_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:4581 [inline]
fs_reclaim_acquire+0xd2/0x160 mm/page_alloc.c:4572
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
__page_cache_alloc mm/filemap.c:1005 [inline]
__page_cache_alloc+0x303/0x3a0 mm/filemap.c:990
page_cache_ra_unbounded+0x348/0x930 mm/readahead.c:215
do_page_cache_ra mm/readahead.c:267 [inline]
ondemand_readahead+0x65c/0x1190 mm/readahead.c:550
page_cache_async_ra mm/readahead.c:607 [inline]
page_cache_async_ra+0x2e1/0x3f0 mm/readahead.c:582
page_cache_async_readahead include/linux/pagemap.h:907 [inline]
filemap_readahead mm/filemap.c:2442 [inline]
filemap_get_pages+0x61a/0x1950 mm/filemap.c:2483
filemap_read+0x2ca/0xe40 mm/filemap.c:2550
generic_file_read_iter+0x397/0x4f0 mm/filemap.c:2701
ext4_file_read_iter+0x1d4/0x5d0 fs/ext4/file.c:130
__kernel_read+0x58d/0xa90 fs/read_write.c:454
integrity_kernel_read+0x7b/0xb0 security/integrity/iint.c:199
ima_calc_file_hash_tfm+0x2aa/0x3b0 security/integrity/ima/ima_crypto.c:484
ima_calc_file_shash security/integrity/ima/ima_crypto.c:515 [inline]
ima_calc_file_hash+0x19d/0x4b0 security/integrity/ima/ima_crypto.c:572
ima_collect_measurement+0x4ca/0x570 security/integrity/ima/ima_api.c:252
process_measurement+0xd1c/0x17e0 security/integrity/ima/ima_main.c:330
ima_file_check+0xb9/0x100 security/integrity/ima/ima_main.c:499
do_open fs/namei.c:3363 [inline]
path_openat+0x15b5/0x27e0 fs/namei.c:3494
do_filp_open+0x190/0x3d0 fs/namei.c:3521
do_sys_openat2+0x16d/0x420 fs/open.c:1195
do_sys_open fs/open.c:1211 [inline]
__do_sys_open fs/open.c:1219 [inline]
__se_sys_open fs/open.c:1215 [inline]
__x64_sys_open+0x119/0x1c0 fs/open.c:1215
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: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 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+0x38/0x80 kernel/workqueue.c:3365
wq_numa_init kernel/workqueue.c:5899 [inline]
workqueue_init+0x94/0x979 kernel/workqueue.c:6031
kernel_init_freeable+0x3fb/0x741 init/main.c:1541
kernel_init+0x1a/0x1d0 init/main.c:1449
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: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_node mm/vmalloc.c:2996 [inline]
__vmalloc_area_node mm/vmalloc.c:2828 [inline]
__vmalloc_node_range+0x313/0x960 mm/vmalloc.c:2947
vmalloc_user+0x67/0x80 mm/vmalloc.c:3082
security_read_policy+0x126/0x2c0 security/selinux/ss/services.c:4032
sel_open_policy+0x2dc/0x660 security/selinux/selinuxfs.c:421
do_dentry_open+0x4c8/0x11c0 fs/open.c:826
do_open fs/namei.c:3361 [inline]
path_openat+0x1c0e/0x27e0 fs/namei.c:3494
do_filp_open+0x190/0x3d0 fs/namei.c:3521
do_sys_openat2+0x16d/0x420 fs/open.c:1195
do_sys_open fs/open.c:1211 [inline]
__do_sys_openat fs/open.c:1227 [inline]
__se_sys_openat fs/open.c:1222 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1222
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-execprog/8452:
#0: ffffffff90b710c0 (&selinux_state.policy_mutex){+.+.}-{3:3}, at: sel_open_policy+0xe3/0x660 security/selinux/selinuxfs.c:404
#1: ffff8880b9d31620 (lock#2){-.-.}-{2:2}, at: __alloc_pages_bulk+0x4ad/0x1870 mm/page_alloc.c:5291

stack backtrace:
CPU: 1 PID: 8452 Comm: syz-execprog 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_node mm/vmalloc.c:2996 [inline]
__vmalloc_area_node mm/vmalloc.c:2828 [inline]
__vmalloc_node_range+0x313/0x960 mm/vmalloc.c:2947
vmalloc_user+0x67/0x80 mm/vmalloc.c:3082
security_read_policy+0x126/0x2c0 security/selinux/ss/services.c:4032
sel_open_policy+0x2dc/0x660 security/selinux/selinuxfs.c:421
do_dentry_open+0x4c8/0x11c0 fs/open.c:826
do_open fs/namei.c:3361 [inline]
path_openat+0x1c0e/0x27e0 fs/namei.c:3494
do_filp_open+0x190/0x3d0 fs/namei.c:3521
do_sys_openat2+0x16d/0x420 fs/open.c:1195
do_sys_open fs/open.c:1211 [inline]
__do_sys_openat fs/open.c:1227 [inline]
__se_sys_openat fs/open.c:1222 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1222
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: 0033:0x4b132a
Code: e8 db 57 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:000000c00009db20 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000000c000020800 RCX: 00000000004b132a
RDX: 0000000000080000 RSI: 000000c000682160 RDI: ffffffffffffff9c
RBP: 000000c00009db98 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: ffffffffffffffff
R13: 000000000000000c R14: 000000000000000b 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: 8452, name: syz-execprog
INFO: lockdep is turned off.
irq event stamp: 7542
hardirqs last enabled at (7541): [<ffffffff89244350>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
hardirqs last enabled at (7541): [<ffffffff89244350>] _raw_spin_unlock_irqrestore+0x50/0x70 kernel/locking/spinlock.c:191
hardirqs last disabled at (7542): [<ffffffff81b146e7>] __alloc_pages_bulk+0x1017/0x1870 mm/page_alloc.c:5291
softirqs last enabled at (7438): [<ffffffff814568be>] invoke_softirq kernel/softirq.c:432 [inline]
softirqs last enabled at (7438): [<ffffffff814568be>] __irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636
softirqs last disabled at (7433): [<ffffffff814568be>] invoke_softirq kernel/softirq.c:432 [inline]
softirqs last disabled at (7433): [<ffffffff814568be>] __irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636
CPU: 1 PID: 8452 Comm: syz-execprog 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_node mm/vmalloc.c:2996 [inline]
__vmalloc_area_node mm/vmalloc.c:2828 [inline]
__vmalloc_node_range+0x313/0x960 mm/vmalloc.c:2947
vmalloc_user+0x67/0x80 mm/vmalloc.c:3082
security_read_policy+0x126/0x2c0 security/selinux/ss/services.c:4032
sel_open_policy+0x2dc/0x660 security/selinux/selinuxfs.c:421
do_dentry_open+0x4c8/0x11c0 fs/open.c:826
do_open fs/namei.c:3361 [inline]
path_openat+0x1c0e/0x27e0 fs/namei.c:3494
do_filp_open+0x190/0x3d0 fs/namei.c:3521
do_sys_openat2+0x16d/0x420 fs/open.c:1195
do_sys_open fs/open.c:1211 [inline]
__do_sys_openat fs/open.c:1227 [inline]
__se_sys_openat fs/open.c:1222 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1222
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: 0033:0x4b132a
Code: e8 db 57 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:000000c00009db20 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000000c000020800 RCX: 00000000004b132a
RDX: 0000000000080000 RSI: 000000c000682160 RDI: ffffffffffffff9c
RBP: 000000c00009db98 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: ffffffffffffffff
R13: 000000000000000c R14: 000000000000000b R15: 0000000000000100


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches

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