======================================================
WARNING: possible circular locking dependency detected
6.2.0-rc6-syzkaller-00050-g9f266ccaa2f5 #0 Not tainted
------------------------------------------------------
kthreadd/2 is trying to acquire lock:
ffff8880253fd090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x79/0x100 fs/reiserfs/lock.c:27
but task is already holding lock:
ffffffff8c8cef00 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4747 [inline]
ffffffff8c8cef00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4772 [inline]
ffffffff8c8cef00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x808/0x23d0 mm/page_alloc.c:5178
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (fs_reclaim){+.+.}-{0:0}:
__fs_reclaim_acquire mm/page_alloc.c:4674 [inline]
fs_reclaim_acquire+0x11d/0x160 mm/page_alloc.c:4688
might_alloc include/linux/sched/mm.h:271 [inline]
slab_pre_alloc_hook mm/slab.h:720 [inline]
slab_alloc_node mm/slab.c:3247 [inline]
slab_alloc mm/slab.c:3272 [inline]
__kmem_cache_alloc_lru mm/slab.c:3449 [inline]
kmem_cache_alloc_lru+0x3e/0x7b0 mm/slab.c:3465
__d_alloc+0x32/0x980 fs/dcache.c:1769
d_alloc_anon fs/dcache.c:1868 [inline]
d_make_root+0x49/0x110 fs/dcache.c:2069
reiserfs_fill_super+0x12eb/0x2e90 fs/reiserfs/super.c:2083
mount_bdev+0x351/0x410 fs/super.c:1359
legacy_get_tree+0x109/0x220 fs/fs_context.c:610
vfs_get_tree+0x8d/0x2f0 fs/super.c:1489
do_new_mount fs/namespace.c:3145 [inline]
path_mount+0x132a/0x1e20 fs/namespace.c:3475
do_mount fs/namespace.c:3488 [inline]
__do_sys_mount fs/namespace.c:3697 [inline]
__se_sys_mount fs/namespace.c:3674 [inline]
__x64_sys_mount+0x283/0x300 fs/namespace.c:3674
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
-> #0 (&sbi->lock){+.+.}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3097 [inline]
check_prevs_add kernel/locking/lockdep.c:3216 [inline]
validate_chain kernel/locking/lockdep.c:3831 [inline]
__lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5055
lock_acquire kernel/locking/lockdep.c:5668 [inline]
lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633
__mutex_lock_common kernel/locking/mutex.c:603 [inline]
__mutex_lock+0x12f/0x1360 kernel/locking/mutex.c:747
reiserfs_write_lock+0x79/0x100 fs/reiserfs/lock.c:27
reiserfs_evict_inode+0x30b/0x540 fs/reiserfs/inode.c:55
evict+0x2ed/0x6b0 fs/inode.c:664
iput_final fs/inode.c:1747 [inline]
iput.part.0+0x59b/0x880 fs/inode.c:1773
iput+0x5c/0x80 fs/inode.c:1763
dentry_unlink_inode+0x2b1/0x460 fs/dcache.c:401
__dentry_kill+0x3c0/0x640 fs/dcache.c:607
shrink_dentry_list+0x240/0x800 fs/dcache.c:1201
prune_dcache_sb+0xeb/0x150 fs/dcache.c:1282
super_cache_scan+0x33a/0x590 fs/super.c:104
do_shrink_slab+0x464/0xce0 mm/vmscan.c:843
shrink_slab_memcg mm/vmscan.c:912 [inline]
shrink_slab+0x388/0x660 mm/vmscan.c:991
shrink_node_memcgs mm/vmscan.c:6140 [inline]
shrink_node+0x95d/0x1f40 mm/vmscan.c:6169
shrink_zones mm/vmscan.c:6407 [inline]
do_try_to_free_pages+0x3b4/0x17a0 mm/vmscan.c:6469
try_to_free_pages+0x2e5/0x960 mm/vmscan.c:6704
__perform_reclaim mm/page_alloc.c:4750 [inline]
__alloc_pages_direct_reclaim mm/page_alloc.c:4772 [inline]
__alloc_pages_slowpath.constprop.0+0x8b6/0x23d0 mm/page_alloc.c:5178
__alloc_pages+0x4aa/0x5b0 mm/page_alloc.c:5562
__alloc_pages_node include/linux/gfp.h:237 [inline]
kmem_getpages mm/slab.c:1363 [inline]
cache_grow_begin+0x94/0x390 mm/slab.c:2576
fallback_alloc+0x1e2/0x2d0 mm/slab.c:3119
__do_cache_alloc mm/slab.c:3223 [inline]
slab_alloc_node mm/slab.c:3256 [inline]
kmem_cache_alloc_node+0x181/0x590 mm/slab.c:3534
alloc_task_struct_node kernel/fork.c:171 [inline]
dup_task_struct kernel/fork.c:979 [inline]
copy_process+0x3aa/0x7520 kernel/fork.c:2097
kernel_clone+0xeb/0x990 kernel/fork.c:2681
kernel_thread+0xb9/0xf0 kernel/fork.c:2741
create_kthread kernel/kthread.c:399 [inline]
kthreadd+0x4f2/0x750 kernel/kthread.c:746
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(fs_reclaim);
lock(&sbi->lock);
lock(fs_reclaim);
lock(&sbi->lock);
*** DEADLOCK ***
3 locks held by kthreadd/2:
#0: ffffffff8c8cef00 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4747 [inline]
#0: ffffffff8c8cef00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4772 [inline]
#0: ffffffff8c8cef00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x808/0x23d0 mm/page_alloc.c:5178
#1: ffffffff8c88caf0 (shrinker_rwsem){++++}-{3:3}, at: shrink_slab_memcg mm/vmscan.c:885 [inline]
#1: ffffffff8c88caf0 (shrinker_rwsem){++++}-{3:3}, at: shrink_slab+0x2a0/0x660 mm/vmscan.c:991
#2: ffff88801ade80e0 (&type->s_umount_key#68){.+.+}-{3:3}, at: trylock_super fs/super.c:415 [inline]
#2: ffff88801ade80e0 (&type->s_umount_key#68){.+.+}-{3:3}, at: super_cache_scan+0x70/0x590 fs/super.c:79
stack backtrace:
CPU: 1 PID: 2 Comm: kthreadd Not tainted 6.2.0-rc6-syzkaller-00050-g9f266ccaa2f5 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2177
check_prev_add kernel/locking/lockdep.c:3097 [inline]
check_prevs_add kernel/locking/lockdep.c:3216 [inline]
validate_chain kernel/locking/lockdep.c:3831 [inline]
__lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5055
lock_acquire kernel/locking/lockdep.c:5668 [inline]
lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633
__mutex_lock_common kernel/locking/mutex.c:603 [inline]
__mutex_lock+0x12f/0x1360 kernel/locking/mutex.c:747
reiserfs_write_lock+0x79/0x100 fs/reiserfs/lock.c:27
reiserfs_evict_inode+0x30b/0x540 fs/reiserfs/inode.c:55
evict+0x2ed/0x6b0 fs/inode.c:664
iput_final fs/inode.c:1747 [inline]
iput.part.0+0x59b/0x880 fs/inode.c:1773
iput+0x5c/0x80 fs/inode.c:1763
dentry_unlink_inode+0x2b1/0x460 fs/dcache.c:401
__dentry_kill+0x3c0/0x640 fs/dcache.c:607
shrink_dentry_list+0x240/0x800 fs/dcache.c:1201
prune_dcache_sb+0xeb/0x150 fs/dcache.c:1282
super_cache_scan+0x33a/0x590 fs/super.c:104
do_shrink_slab+0x464/0xce0 mm/vmscan.c:843
shrink_slab_memcg mm/vmscan.c:912 [inline]
shrink_slab+0x388/0x660 mm/vmscan.c:991
shrink_node_memcgs mm/vmscan.c:6140 [inline]
shrink_node+0x95d/0x1f40 mm/vmscan.c:6169
shrink_zones mm/vmscan.c:6407 [inline]
do_try_to_free_pages+0x3b4/0x17a0 mm/vmscan.c:6469
try_to_free_pages+0x2e5/0x960 mm/vmscan.c:6704
__perform_reclaim mm/page_alloc.c:4750 [inline]
__alloc_pages_direct_reclaim mm/page_alloc.c:4772 [inline]
__alloc_pages_slowpath.constprop.0+0x8b6/0x23d0 mm/page_alloc.c:5178
__alloc_pages+0x4aa/0x5b0 mm/page_alloc.c:5562
__alloc_pages_node include/linux/gfp.h:237 [inline]
kmem_getpages mm/slab.c:1363 [inline]
cache_grow_begin+0x94/0x390 mm/slab.c:2576
fallback_alloc+0x1e2/0x2d0 mm/slab.c:3119
__do_cache_alloc mm/slab.c:3223 [inline]
slab_alloc_node mm/slab.c:3256 [inline]
kmem_cache_alloc_node+0x181/0x590 mm/slab.c:3534
alloc_task_struct_node kernel/fork.c:171 [inline]
dup_task_struct kernel/fork.c:979 [inline]
copy_process+0x3aa/0x7520 kernel/fork.c:2097
kernel_clone+0xeb/0x990 kernel/fork.c:2681
kernel_thread+0xb9/0xf0 kernel/fork.c:2741
create_kthread kernel/kthread.c:399 [inline]
kthreadd+0x4f2/0x750 kernel/kthread.c:746
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
</TASK>