R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
======================================================
WARNING: possible circular locking dependency detected
6.6.0-syzkaller-15477-g34f763262743 #0 Not tainted
------------------------------------------------------
syz-executor.2/18847 is trying to acquire lock:
ffffffff8d11d1a0 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:303 [inline]
ffffffff8d11d1a0 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slab.h:710 [inline]
ffffffff8d11d1a0 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:3460 [inline]
ffffffff8d11d1a0 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc mm/slub.c:3486 [inline]
ffffffff8d11d1a0 (fs_reclaim){+.+.}-{0:0}, at: __kmem_cache_alloc_lru mm/slub.c:3493 [inline]
ffffffff8d11d1a0 (fs_reclaim){+.+.}-{0:0}, at: kmem_cache_alloc+0x4f/0x380 mm/slub.c:3502
but task is already holding lock:
ffff888026ed0288 (&ei->i_data_sem){++++}-{3:3}, at: ext4_da_map_blocks fs/ext4/inode.c:1745 [inline]
ffff888026ed0288 (&ei->i_data_sem){++++}-{3:3}, at: ext4_da_get_block_prep+0x6c9/0x1340 fs/ext4/inode.c:1823
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&ei->i_data_sem){++++}-{3:3}:
down_write+0x93/0x200 kernel/locking/rwsem.c:1579
ext4_truncate+0xd13/0x1300 fs/ext4/inode.c:4164
ext4_evict_inode+0x7a1/0x1a30 fs/ext4/inode.c:258
evict+0x2ed/0x6b0 fs/inode.c:664
iput_final fs/inode.c:1775 [inline]
iput.part.0+0x55e/0x7a0 fs/inode.c:1801
iput+0x5c/0x80 fs/inode.c:1791
ext4_orphan_cleanup+0x70f/0x11d0 fs/ext4/orphan.c:474
__ext4_fill_super fs/ext4/super.c:5591 [inline]
ext4_fill_super+0x93af/0xaf20 fs/ext4/super.c:5712
get_tree_bdev+0x3b5/0x650 fs/super.c:1598
vfs_get_tree+0x8c/0x370 fs/super.c:1771
do_new_mount fs/namespace.c:3337 [inline]
path_mount+0x1492/0x1ed0 fs/namespace.c:3664
do_mount fs/namespace.c:3677 [inline]
__do_sys_mount fs/namespace.c:3886 [inline]
__se_sys_mount fs/namespace.c:3863 [inline]
__ia32_sys_mount+0x291/0x310 fs/namespace.c:3863
do_syscall_32_irqs_on arch/x86/entry/common.c:164 [inline]
__do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:230
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:255
entry_SYSENTER_compat_after_hwframe+0x70/0x7a
-> #1 (sb_internal){.+.+}-{0:0}:
percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
__sb_start_write include/linux/fs.h:1635 [inline]
sb_start_intwrite include/linux/fs.h:1757 [inline]
ext4_evict_inode+0xe55/0x1a30 fs/ext4/inode.c:212
evict+0x2ed/0x6b0 fs/inode.c:664
iput_final fs/inode.c:1775 [inline]
iput.part.0+0x55e/0x7a0 fs/inode.c:1801
iput+0x5c/0x80 fs/inode.c:1791
dentry_unlink_inode+0x292/0x430 fs/dcache.c:401
__dentry_kill+0x3b8/0x640 fs/dcache.c:607
shrink_dentry_list+0x22b/0x7d0 fs/dcache.c:1201
prune_dcache_sb+0xeb/0x150 fs/dcache.c:1282
super_cache_scan+0x327/0x540 fs/super.c:228
do_shrink_slab+0x428/0x1120 mm/shrinker.c:435
shrink_slab_memcg mm/shrinker.c:548 [inline]
shrink_slab+0xa83/0x1310 mm/shrinker.c:626
shrink_one+0x4f7/0x700 mm/vmscan.c:4724
shrink_many mm/vmscan.c:4776 [inline]
lru_gen_shrink_node mm/vmscan.c:4893 [inline]
shrink_node+0x20cd/0x3790 mm/vmscan.c:5833
kswapd_shrink_node mm/vmscan.c:6638 [inline]
balance_pgdat+0xa32/0x1b80 mm/vmscan.c:6828
kswapd+0x5be/0xbf0 mm/vmscan.c:7088
kthread+0x33c/0x440 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
-> #0 (fs_reclaim){+.+.}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3868 [inline]
__lock_acquire+0x2e3d/0x5de0 kernel/locking/lockdep.c:5136
lock_acquire kernel/locking/lockdep.c:5753 [inline]
lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5718
__fs_reclaim_acquire mm/page_alloc.c:3693 [inline]
fs_reclaim_acquire+0x100/0x150 mm/page_alloc.c:3707
might_alloc include/linux/sched/mm.h:303 [inline]
slab_pre_alloc_hook mm/slab.h:710 [inline]
slab_alloc_node mm/slub.c:3460 [inline]
slab_alloc mm/slub.c:3486 [inline]
__kmem_cache_alloc_lru mm/slub.c:3493 [inline]
kmem_cache_alloc+0x4f/0x380 mm/slub.c:3502
kmem_cache_zalloc include/linux/slab.h:711 [inline]
__es_alloc_extent fs/ext4/extents_status.c:483 [inline]
ext4_es_insert_delayed_block+0x542/0x750 fs/ext4/extents_status.c:2090
ext4_insert_delayed_block fs/ext4/inode.c:1674 [inline]
ext4_da_map_blocks fs/ext4/inode.c:1762 [inline]
ext4_da_get_block_prep+0x850/0x1340 fs/ext4/inode.c:1823
ext4_block_write_begin+0x3da/0xee0 fs/ext4/inode.c:1053
ext4_da_write_begin+0x40a/0x8c0 fs/ext4/inode.c:2900
generic_perform_write+0x278/0x600 mm/filemap.c:3918
ext4_buffered_write_iter+0x11f/0x3c0 fs/ext4/file.c:299
ext4_file_write_iter+0x819/0x1950 fs/ext4/file.c:696
call_write_iter include/linux/fs.h:2020 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x64f/0xdf0 fs/read_write.c:584
ksys_write+0x12f/0x250 fs/read_write.c:637
do_syscall_32_irqs_on arch/x86/entry/common.c:164 [inline]
__do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:230
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:255
entry_SYSENTER_compat_after_hwframe+0x70/0x7a
other info that might help us debug this:
Chain exists of:
fs_reclaim --> sb_internal --> &ei->i_data_sem
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
rlock(&ei->i_data_sem);
lock(sb_internal);
lock(&ei->i_data_sem);
lock(fs_reclaim);
*** DEADLOCK ***
4 locks held by syz-executor.2/18847:
#0: ffff888025257048 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe7/0x170 fs/file.c:1177
#1: ffff88801e25c418 (sb_writers#4){.+.+}-{0:0}, at: ksys_write+0x12f/0x250 fs/read_write.c:637
#2: ffff888026ed0400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline]
#2: ffff888026ed0400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x3c0 fs/ext4/file.c:294
#3: ffff888026ed0288 (&ei->i_data_sem){++++}-{3:3}, at: ext4_da_map_blocks fs/ext4/inode.c:1745 [inline]
#3: ffff888026ed0288 (&ei->i_data_sem){++++}-{3:3}, at: ext4_da_get_block_prep+0x6c9/0x1340 fs/ext4/inode.c:1823
stack backtrace:
CPU: 2 PID: 18847 Comm: syz-executor.2 Not tainted 6.6.0-syzkaller-15477-g34f763262743 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
check_noncircular+0x311/0x3f0 kernel/locking/lockdep.c:2187
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3868 [inline]
__lock_acquire+0x2e3d/0x5de0 kernel/locking/lockdep.c:5136
lock_acquire kernel/locking/lockdep.c:5753 [inline]
lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5718
__fs_reclaim_acquire mm/page_alloc.c:3693 [inline]
fs_reclaim_acquire+0x100/0x150 mm/page_alloc.c:3707
might_alloc include/linux/sched/mm.h:303 [inline]
slab_pre_alloc_hook mm/slab.h:710 [inline]
slab_alloc_node mm/slub.c:3460 [inline]
slab_alloc mm/slub.c:3486 [inline]
__kmem_cache_alloc_lru mm/slub.c:3493 [inline]
kmem_cache_alloc+0x4f/0x380 mm/slub.c:3502
kmem_cache_zalloc include/linux/slab.h:711 [inline]
__es_alloc_extent fs/ext4/extents_status.c:483 [inline]
ext4_es_insert_delayed_block+0x542/0x750 fs/ext4/extents_status.c:2090
ext4_insert_delayed_block fs/ext4/inode.c:1674 [inline]
ext4_da_map_blocks fs/ext4/inode.c:1762 [inline]
ext4_da_get_block_prep+0x850/0x1340 fs/ext4/inode.c:1823
ext4_block_write_begin+0x3da/0xee0 fs/ext4/inode.c:1053
ext4_da_write_begin+0x40a/0x8c0 fs/ext4/inode.c:2900
generic_perform_write+0x278/0x600 mm/filemap.c:3918
ext4_buffered_write_iter+0x11f/0x3c0 fs/ext4/file.c:299
ext4_file_write_iter+0x819/0x1950 fs/ext4/file.c:696
call_write_iter include/linux/fs.h:2020 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x64f/0xdf0 fs/read_write.c:584
ksys_write+0x12f/0x250 fs/read_write.c:637
do_syscall_32_irqs_on arch/x86/entry/common.c:164 [inline]
__do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:230
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:255
entry_SYSENTER_compat_after_hwframe+0x70/0x7a
RIP: 0023:0xf7f49579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f7f235ac EFLAGS: 00000292 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000540
RDX: 00000000fffffdd8 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 10 06 adc %al,(%rsi)
2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi
6: 10 07 adc %al,(%rdi)
8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi
c: 10 08 adc %cl,(%rax)
e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi
1e: 00 51 52 add %dl,0x52(%rcx)
21: 55 push %rbp
22: 89 e5 mov %esp,%ebp
24: 0f 34 sysenter
26: cd 80 int $0x80
* 28: 5d pop %rbp <-- trapping instruction
29: 5a pop %rdx
2a: 59 pop %rcx
2b: c3 ret
2c: 90 nop
2d: 90 nop
2e: 90 nop
2f: 90 nop
30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi