======================================================
WARNING: possible circular locking dependency detected
6.10.0-rc4-syzkaller-00164-g66cc544fd75c #0 Not tainted
------------------------------------------------------
syz-executor.1/18917 is trying to acquire lock:
ffffffff8dd3ab20 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:334 [inline]
ffffffff8dd3ab20 (fs_reclaim){+.+.}-{0:0}, at: prepare_alloc_pages.constprop.0+0x155/0x560 mm/page_alloc.c:4449
but task is already holding lock:
ffff888028d0b2a0 (&nilfs->ns_segctor_sem){++++}-{3:3}, at: nilfs_transaction_begin+0x326/0xa40 fs/nilfs2/segment.c:223
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&nilfs->ns_segctor_sem){++++}-{3:3}:
down_read+0x9a/0x330 kernel/locking/rwsem.c:1526
nilfs_transaction_begin+0x326/0xa40 fs/nilfs2/segment.c:223
nilfs_create+0xb7/0x320 fs/nilfs2/namei.c:82
lookup_open.isra.0+0x10a1/0x13c0 fs/namei.c:3505
open_last_lookups fs/namei.c:3574 [inline]
path_openat+0x92f/0x29f0 fs/namei.c:3804
do_filp_open+0x1dc/0x430 fs/namei.c:3834
do_sys_openat2+0x17a/0x1e0 fs/open.c:1405
do_sys_open fs/open.c:1420 [inline]
__do_compat_sys_open fs/open.c:1471 [inline]
__se_compat_sys_open fs/open.c:1469 [inline]
__ia32_compat_sys_open+0x147/0x1e0 fs/open.c:1469
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
-> #1 (sb_internal#5){.+.+}-{0:0}:
percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
__sb_start_write include/linux/fs.h:1655 [inline]
sb_start_intwrite include/linux/fs.h:1838 [inline]
nilfs_transaction_begin+0x21b/0xa40 fs/nilfs2/segment.c:220
nilfs_evict_inode+0x157/0x550 fs/nilfs2/inode.c:924
evict+0x2ed/0x6c0 fs/inode.c:667
iput_final fs/inode.c:1741 [inline]
iput.part.0+0x5a8/0x7f0 fs/inode.c:1767
iput+0x5c/0x80 fs/inode.c:1757
dentry_unlink_inode+0x295/0x480 fs/dcache.c:400
__dentry_kill+0x1d0/0x600 fs/dcache.c:603
shrink_kill fs/dcache.c:1048 [inline]
shrink_dentry_list+0x140/0x5d0 fs/dcache.c:1075
prune_dcache_sb+0xeb/0x150 fs/dcache.c:1156
super_cache_scan+0x32a/0x550 fs/super.c:221
do_shrink_slab+0x44f/0x11c0 mm/shrinker.c:435
shrink_slab_memcg mm/shrinker.c:548 [inline]
shrink_slab+0xa87/0x1310 mm/shrinker.c:626
shrink_one+0x493/0x7c0 mm/vmscan.c:4790
shrink_many mm/vmscan.c:4851 [inline]
lru_gen_shrink_node+0x89f/0x1750 mm/vmscan.c:4951
shrink_node mm/vmscan.c:5910 [inline]
kswapd_shrink_node mm/vmscan.c:6720 [inline]
balance_pgdat+0x1105/0x1970 mm/vmscan.c:6911
kswapd+0x5ea/0xbf0 mm/vmscan.c:7180
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
-> #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:3869 [inline]
__lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137
lock_acquire kernel/locking/lockdep.c:5754 [inline]
lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
__fs_reclaim_acquire mm/page_alloc.c:3801 [inline]
fs_reclaim_acquire+0x102/0x160 mm/page_alloc.c:3815
might_alloc include/linux/sched/mm.h:334 [inline]
prepare_alloc_pages.constprop.0+0x155/0x560 mm/page_alloc.c:4449
__alloc_pages_noprof+0x194/0x2460 mm/page_alloc.c:4667
alloc_pages_mpol_noprof+0x275/0x610 mm/mempolicy.c:2265
folio_alloc_noprof+0x1e/0xc0 mm/mempolicy.c:2343
filemap_alloc_folio_noprof+0x3ba/0x490 mm/filemap.c:1008
__filemap_get_folio+0x53d/0xae0 mm/filemap.c:1950
pagecache_get_page+0x2c/0x250 mm/folio-compat.c:87
block_write_begin+0x38/0x4a0 fs/buffer.c:2232
nilfs_write_begin+0x9f/0x1a0 fs/nilfs2/inode.c:262
page_symlink+0x356/0x450 fs/namei.c:5236
nilfs_symlink+0x23c/0x3c0 fs/nilfs2/namei.c:153
vfs_symlink fs/namei.c:4489 [inline]
vfs_symlink+0x3e8/0x660 fs/namei.c:4473
do_symlinkat+0x263/0x310 fs/namei.c:4515
__do_sys_symlinkat fs/namei.c:4531 [inline]
__se_sys_symlinkat fs/namei.c:4528 [inline]
__ia32_sys_symlinkat+0x97/0xc0 fs/namei.c:4528
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
other info that might help us debug this:
Chain exists of:
fs_reclaim --> sb_internal#5 --> &nilfs->ns_segctor_sem
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
rlock(&nilfs->ns_segctor_sem);
lock(sb_internal#5);
lock(&nilfs->ns_segctor_sem);
lock(fs_reclaim);
*** DEADLOCK ***
4 locks held by syz-executor.1/18917:
#0: ffff88801eb82420 (sb_writers#31){.+.+}-{0:0}, at: filename_create+0x10d/0x530 fs/namei.c:3893
#1: ffff8880295642b8 (&type->i_mutex_dir_key#21/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:826 [inline]
#1: ffff8880295642b8 (&type->i_mutex_dir_key#21/1){+.+.}-{3:3}, at: filename_create+0x1c2/0x530 fs/namei.c:3900
#2: ffff88801eb82610 (sb_internal#5){.+.+}-{0:0}, at: nilfs_symlink+0x114/0x3c0 fs/nilfs2/namei.c:140
#3: ffff888028d0b2a0 (&nilfs->ns_segctor_sem){++++}-{3:3}, at: nilfs_transaction_begin+0x326/0xa40 fs/nilfs2/segment.c:223
stack backtrace:
CPU: 2 PID: 18917 Comm: syz-executor.1 Not tainted 6.10.0-rc4-syzkaller-00164-g66cc544fd75c #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+0x116/0x1f0 lib/dump_stack.c:114
check_noncircular+0x31a/0x400 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:3869 [inline]
__lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137
lock_acquire kernel/locking/lockdep.c:5754 [inline]
lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
__fs_reclaim_acquire mm/page_alloc.c:3801 [inline]
fs_reclaim_acquire+0x102/0x160 mm/page_alloc.c:3815
might_alloc include/linux/sched/mm.h:334 [inline]
prepare_alloc_pages.constprop.0+0x155/0x560 mm/page_alloc.c:4449
__alloc_pages_noprof+0x194/0x2460 mm/page_alloc.c:4667
alloc_pages_mpol_noprof+0x275/0x610 mm/mempolicy.c:2265
folio_alloc_noprof+0x1e/0xc0 mm/mempolicy.c:2343
filemap_alloc_folio_noprof+0x3ba/0x490 mm/filemap.c:1008
__filemap_get_folio+0x53d/0xae0 mm/filemap.c:1950
pagecache_get_page+0x2c/0x250 mm/folio-compat.c:87
block_write_begin+0x38/0x4a0 fs/buffer.c:2232
nilfs_write_begin+0x9f/0x1a0 fs/nilfs2/inode.c:262
page_symlink+0x356/0x450 fs/namei.c:5236
nilfs_symlink+0x23c/0x3c0 fs/nilfs2/namei.c:153
vfs_symlink fs/namei.c:4489 [inline]
vfs_symlink+0x3e8/0x660 fs/namei.c:4473
do_symlinkat+0x263/0x310 fs/namei.c:4515
__do_sys_symlinkat fs/namei.c:4531 [inline]
__se_sys_symlinkat fs/namei.c:4528 [inline]
__ia32_sys_symlinkat+0x97/0xc0 fs/namei.c:4528
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7329579
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:00000000f5f1b5ac EFLAGS: 00000292 ORIG_RAX: 0000000000000130
RAX: ffffffffffffffda RBX: 00000000200001c0 RCX: 00000000ffffff9c
RDX: 0000000020000200 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 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