======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.45/4560 is trying to acquire lock:
ffff88805a01d488 (&osb->system_file_mutex){+.+.}-{3:3}, at: ocfs2_get_system_file_inode+0x1b5/0x760 fs/ocfs2/sysfile.c:101
but task is already holding lock:
ffff88805e8a3120 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_write_begin+0x18a/0x300 fs/ocfs2/aops.c:1903
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}:
down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498
ocfs2_read_virt_blocks+0x23f/0x8a0 fs/ocfs2/extent_map.c:976
ocfs2_read_dir_block fs/ocfs2/dir.c:508 [inline]
ocfs2_find_entry_el fs/ocfs2/dir.c:715 [inline]
ocfs2_find_entry+0x3d1/0x1f90 fs/ocfs2/dir.c:1091
ocfs2_find_files_on_disk+0xdb/0x2f0 fs/ocfs2/dir.c:1995
ocfs2_lookup_ino_from_name+0x4f/0xf0 fs/ocfs2/dir.c:2017
_ocfs2_get_system_file_inode fs/ocfs2/sysfile.c:136 [inline]
ocfs2_get_system_file_inode+0x319/0x760 fs/ocfs2/sysfile.c:112
ocfs2_init_global_system_inodes+0x316/0x650 fs/ocfs2/super.c:458
ocfs2_initialize_super fs/ocfs2/super.c:2279 [inline]
ocfs2_fill_super+0x3dbf/0x4d80 fs/ocfs2/super.c:995
mount_bdev+0x287/0x3c0 fs/super.c:1400
legacy_get_tree+0xe6/0x180 fs/fs_context.c:611
vfs_get_tree+0x88/0x270 fs/super.c:1530
do_new_mount+0x24a/0xa40 fs/namespace.c:3025
do_mount fs/namespace.c:3368 [inline]
__do_sys_mount fs/namespace.c:3576 [inline]
__se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3553
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
-> #0 (
&osb->system_file_mutex){+.+.}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3053 [inline]
check_prevs_add kernel/locking/lockdep.c:3172 [inline]
validate_chain kernel/locking/lockdep.c:3788 [inline]
__lock_acquire+0x2c33/0x7c60 kernel/locking/lockdep.c:5012
lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623
__mutex_lock_common+0x1eb/0x2390 kernel/locking/mutex.c:596
__mutex_lock kernel/locking/mutex.c:729 [inline]
mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
ocfs2_get_system_file_inode+0x1b5/0x760 fs/ocfs2/sysfile.c:101
ocfs2_reserve_suballoc_bits+0x139/0x4350 fs/ocfs2/suballoc.c:776
ocfs2_reserve_cluster_bitmap_bits fs/ocfs2/suballoc.c:1128 [inline]
ocfs2_reserve_clusters_with_limit+0x2f8/0xba0 fs/ocfs2/suballoc.c:1173
ocfs2_reserve_clusters fs/ocfs2/suballoc.c:1223 [inline]
ocfs2_lock_allocators+0x2f7/0x5b0 fs/ocfs2/suballoc.c:2669
ocfs2_write_begin_nolock+0x2216/0x4180 fs/ocfs2/aops.c:1741
ocfs2_write_begin+0x1ab/0x300 fs/ocfs2/aops.c:1905
generic_perform_write+0x2aa/0x530 mm/filemap.c:3785
__generic_file_write_iter+0x25f/0x4e0 mm/filemap.c:3912
ocfs2_file_write_iter+0x1578/0x1cf0 fs/ocfs2/file.c:2472
call_write_iter include/linux/fs.h:2172 [inline]
new_sync_write fs/read_write.c:507 [inline]
vfs_write+0x712/0xd00 fs/read_write.c:594
ksys_write+0x14d/0x250 fs/read_write.c:647
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&ocfs2_file_ip_alloc_sem_key);
lock(&osb->system_file_mutex);
lock(&ocfs2_file_ip_alloc_sem_key);
lock(&osb->system_file_mutex);
*** DEADLOCK ***
4 locks held by syz.0.45/4560:
#0: ffff88807f6165f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2bf/0x370 fs/file.c:1056
#1: ffff888064ec2460 (sb_writers#15){.+.+}-{0:0}, at: vfs_write+0x28a/0xd00 fs/read_write.c:590
#2: ffff88805e8a3488 (&sb->s_type->i_mutex_key#22){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#2: ffff88805e8a3488 (&sb->s_type->i_mutex_key#22){+.+.}-{3:3}, at: ocfs2_file_write_iter+0x401/0x1cf0 fs/ocfs2/file.c:2402
#3: ffff88805e8a3120 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_write_begin+0x18a/0x300 fs/ocfs2/aops.c:1903
stack backtrace:
CPU: 1 PID: 4560 Comm: syz.0.45 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
check_noncircular+0x274/0x310 kernel/locking/lockdep.c:2133
check_prev_add kernel/locking/lockdep.c:3053 [inline]
check_prevs_add kernel/locking/lockdep.c:3172 [inline]
validate_chain kernel/locking/lockdep.c:3788 [inline]
__lock_acquire+0x2c33/0x7c60 kernel/locking/lockdep.c:5012
lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623
__mutex_lock_common+0x1eb/0x2390 kernel/locking/mutex.c:596
__mutex_lock kernel/locking/mutex.c:729 [inline]
mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
ocfs2_get_system_file_inode+0x1b5/0x760 fs/ocfs2/sysfile.c:101
ocfs2_reserve_suballoc_bits+0x139/0x4350 fs/ocfs2/suballoc.c:776
ocfs2_reserve_cluster_bitmap_bits fs/ocfs2/suballoc.c:1128 [inline]
ocfs2_reserve_clusters_with_limit+0x2f8/0xba0 fs/ocfs2/suballoc.c:1173
ocfs2_reserve_clusters fs/ocfs2/suballoc.c:1223 [inline]
ocfs2_lock_allocators+0x2f7/0x5b0 fs/ocfs2/suballoc.c:2669
ocfs2_write_begin_nolock+0x2216/0x4180 fs/ocfs2/aops.c:1741
ocfs2_write_begin+0x1ab/0x300 fs/ocfs2/aops.c:1905
generic_perform_write+0x2aa/0x530 mm/filemap.c:3785
__generic_file_write_iter+0x25f/0x4e0 mm/filemap.c:3912
ocfs2_file_write_iter+0x1578/0x1cf0 fs/ocfs2/file.c:2472
call_write_iter include/linux/fs.h:2172 [inline]
new_sync_write fs/read_write.c:507 [inline]
vfs_write+0x712/0xd00 fs/read_write.c:594
ksys_write+0x14d/0x250 fs/read_write.c:647
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f0fafb80ba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0fadde8038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f0fafdc7fa0 RCX: 00007f0fafb80ba9
RDX: 000000000208e24b RSI: 0000200000000040 RDI: 0000000000000005
RBP: 00007f0fafc03e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0fafdc8038 R14: 00007f0fafdc7fa0 R15: 00007ffce964d258
------------[ cut here ]------------
kernel BUG at fs/ocfs2/aops.c:1181!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 4560 Comm: syz.0.45 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:ocfs2_write_cluster fs/ocfs2/aops.c:1181 [inline]
RIP: 0010:ocfs2_write_cluster_by_desc+0x1cda/0x1d00 fs/ocfs2/aops.c:1242
Code: 4c 8b 03 48 8d bc 24 10 02 00 00 48 c7 c6 8b c0 a3 8b ba 80 04 00 00 48 c7 c1 40 79 47 8a e8 ed 77 19 00 0f 0b e8 d6 a4 63 fe <0f> 0b e8 cf a4 63 fe 0f 0b e8 c8 a4 63 fe 0f 0b e8 c1 a4 63 fe 0f
RSP: 0018:ffffc900038f6e60 EFLAGS: 00010246
RAX: ffffffff8314264a RBX: ffff888066b66014 RCX: 0000000000080000
RDX: ffffc90003b43000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc900038f7190 R08: dffffc0000000000 R09: ffffed100bd1463d
R10: ffffed100bd1463d R11: 1ffff1100bd1463c R12: ffff88805a01c000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888066b66014
FS: 00007f0fadde86c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055e55fc4d078 CR3: 0000000061d5b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
ocfs2_write_begin_nolock+0x3057/0x4180 fs/ocfs2/aops.c:1818
ocfs2_write_begin+0x1ab/0x300 fs/ocfs2/aops.c:1905
generic_perform_write+0x2aa/0x530 mm/filemap.c:3785
__generic_file_write_iter+0x25f/0x4e0 mm/filemap.c:3912
ocfs2_file_write_iter+0x1578/0x1cf0 fs/ocfs2/file.c:2472
call_write_iter include/linux/fs.h:2172 [inline]
new_sync_write fs/read_write.c:507 [inline]
vfs_write+0x712/0xd00 fs/read_write.c:594
ksys_write+0x14d/0x250 fs/read_write.c:647
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f0fafb80ba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0fadde8038 EFLAGS: 00000246
ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f0fafdc7fa0 RCX: 00007f0fafb80ba9
RDX: 000000000208e24b RSI: 0000200000000040 RDI: 0000000000000005
RBP: 00007f0fafc03e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0fafdc8038 R14: 00007f0fafdc7fa0 R15: 00007ffce964d258
Modules linked in:
---[ end trace f8ac5324c75b6aae ]---
RIP: 0010:ocfs2_write_cluster fs/ocfs2/aops.c:1181 [inline]
RIP: 0010:ocfs2_write_cluster_by_desc+0x1cda/0x1d00 fs/ocfs2/aops.c:1242
Code: 4c 8b 03 48 8d bc 24 10 02 00 00 48 c7 c6 8b c0 a3 8b ba 80 04 00 00 48 c7 c1 40 79 47 8a e8 ed 77 19 00 0f 0b e8 d6 a4 63 fe <0f> 0b e8 cf a4 63 fe 0f 0b e8 c8 a4 63 fe 0f 0b e8 c1 a4 63 fe 0f
RSP: 0018:ffffc900038f6e60 EFLAGS: 00010246
RAX: ffffffff8314264a RBX: ffff888066b66014 RCX: 0000000000080000
RDX: ffffc90003b43000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc900038f7190 R08: dffffc0000000000 R09: ffffed100bd1463d
R10: ffffed100bd1463d R11: 1ffff1100bd1463c R12: ffff88805a01c000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888066b66014
FS: 00007f0fadde86c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc5ac06f7d0 CR3: 0000000061d5b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400