======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.1.342/9164 is trying to acquire lock:
ffff8880379551b0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:601
but task is already holding lock:
ffff88801a07d238 (&root->kernfs_rwsem){++++}-{4:4}, at: kernfs_fop_readdir+0x269/0x950 fs/kernfs/dir.c:1983
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (&root->kernfs_rwsem){++++}-{4:4}:
down_write+0x3a/0x50 kernel/locking/rwsem.c:1625
kernfs_add_one+0x41/0x5c0 fs/kernfs/dir.c:826
kernfs_create_dir_ns+0xde/0x130 fs/kernfs/dir.c:1131
sysfs_create_dir_ns+0x12f/0x2a0 fs/sysfs/dir.c:59
create_dir lib/kobject.c:73 [inline]
kobject_add_internal+0x631/0xd10 lib/kobject.c:240
kobject_add_varg lib/kobject.c:374 [inline]
kobject_init_and_add+0x12b/0x1a0 lib/kobject.c:457
btrfs_sysfs_add_qgroups+0x116/0x2e0 fs/btrfs/sysfs.c:2604
btrfs_quota_enable+0x269/0x29e0 fs/btrfs/qgroup.c:1034
btrfs_ioctl_quota_ctl+0x186/0x1c0 fs/btrfs/ioctl.c:3541
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xff/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #3 (&fs_info->qgroup_ioctl_lock){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/rtmutex_api.c:534 [inline]
mutex_lock_nested+0x5a/0x1d0 kernel/locking/rtmutex_api.c:553
btrfs_quota_enable+0x29e/0x29e0 fs/btrfs/qgroup.c:1063
btrfs_ioctl_quota_ctl+0x186/0x1c0 fs/btrfs/ioctl.c:3541
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xff/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #2 (btrfs_trans_num_extwriters){++++}-{0:0}:
join_transaction+0x192/0xd50 fs/btrfs/transaction.c:324
start_transaction+0xbe9/0x1820 fs/btrfs/transaction.c:719
btrfs_create_common+0x15c/0x310 fs/btrfs/inode.c:6981
btrfs_mkdir+0xc7/0xf0 fs/btrfs/inode.c:7126
vfs_mkdir+0x40b/0x630 fs/namei.c:5261
filename_mkdirat+0x289/0x520 fs/namei.c:5294
__do_sys_mkdirat fs/namei.c:5315 [inline]
__se_sys_mkdirat+0x35/0x150 fs/namei.c:5312
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #1 (btrfs_trans_num_writers){++++}-{0:0}:
__lock_release kernel/locking/lockdep.c:5574 [inline]
lock_release+0x199/0x3c0 kernel/locking/lockdep.c:5889
percpu_up_read include/linux/percpu-rwsem.h:112 [inline]
__sb_end_write include/linux/fs/super.h:14 [inline]
sb_end_intwrite+0x26/0x1c0 include/linux/fs/super.h:101
__btrfs_end_transaction+0x248/0x650 fs/btrfs/transaction.c:1096
btrfs_dirty_inode+0x14c/0x190 fs/btrfs/inode.c:6457
touch_atime+0x2f8/0x6b0 fs/inode.c:2271
file_accessed include/linux/fs.h:2264 [inline]
btrfs_file_mmap_prepare+0x189/0x200 fs/btrfs/file.c:2056
vfs_mmap_prepare include/linux/fs.h:2076 [inline]
call_mmap_prepare mm/vma.c:2672 [inline]
__mmap_region mm/vma.c:2755 [inline]
mmap_region+0xeb9/0x2280 mm/vma.c:2857
do_mmap+0xc2f/0x10c0 mm/mmap.c:560
vm_mmap_pgoff+0x2cc/0x4f0 mm/util.c:581
ksys_mmap_pgoff+0x4e8/0x720 mm/mmap.c:606
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 (&mm->mmap_lock){++++}-{4:4}:
check_prev_add kernel/locking/lockdep.c:3165 [inline]
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237
lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
down_read_killable+0xa4/0x220 kernel/locking/rwsem.c:1593
mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:601
get_mmap_lock_carefully mm/mmap_lock.c:450 [inline]
lock_mm_and_find_vma+0x2d7/0x340 mm/mmap_lock.c:501
do_user_addr_fault+0x330/0x1340 arch/x86/mm/fault.c:1357
handle_page_fault arch/x86/mm/fault.c:1474 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
filldir+0x2b3/0x650 fs/readdir.c:289
dir_emit include/linux/fs.h:3578 [inline]
kernfs_fop_readdir+0x578/0x950 fs/kernfs/dir.c:2000
iterate_dir+0x3a5/0x580 fs/readdir.c:110
__do_sys_getdents fs/readdir.c:319 [inline]
__se_sys_getdents+0xf1/0x270 fs/readdir.c:304
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Chain exists of:
&mm->mmap_lock --> &fs_info->qgroup_ioctl_lock --> &root->kernfs_rwsem
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
rlock(&root->kernfs_rwsem);
lock(&fs_info->qgroup_ioctl_lock);
lock(&root->kernfs_rwsem);
rlock(&mm->mmap_lock);
*** DEADLOCK ***
3 locks held by syz.1.342/9164:
#0: ffff888025722128 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x252/0x320 fs/file.c:1261
#1: ffff88803d933220 (&type->i_mutex_dir_key#6){++++}-{4:4}, at: iterate_dir+0x29e/0x580 fs/readdir.c:103
#2: ffff88801a07d238 (&root->kernfs_rwsem){++++}-{4:4}, at: kernfs_fop_readdir+0x269/0x950 fs/kernfs/dir.c:1983
stack backtrace:
CPU: 1 UID: 0 PID: 9164 Comm: syz.1.342 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2043
check_noncircular+0x12e/0x150 kernel/locking/lockdep.c:2175
check_prev_add kernel/locking/lockdep.c:3165 [inline]
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237
lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
down_read_killable+0xa4/0x220 kernel/locking/rwsem.c:1593
mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:601
get_mmap_lock_carefully mm/mmap_lock.c:450 [inline]
lock_mm_and_find_vma+0x2d7/0x340 mm/mmap_lock.c:501
do_user_addr_fault+0x330/0x1340 arch/x86/mm/fault.c:1357
handle_page_fault arch/x86/mm/fault.c:1474 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0010:filldir+0x2b3/0x650 fs/readdir.c:290
Code: 00 48 39 c8 48 0f 47 c1 0f 01 cb 48 8b 4c 24 30 48 89 48 08 48 bd 00 00 00 00 00 fc ff df 48 8b 44 24 28 48 89 02 8b 44 24 04 <66> 89 42 10 41 80 e7 0f 89 c0 44 88 7c 02 ff 48 89 44 24 28 42 c6
RSP: 0018:ffffc9000394fc38 EFLAGS: 00050283
RAX: 0000000000000028 RBX: ffffc9000394fe38 RCX: 000000001d8c43de
RDX: 0000200000001ff0 RSI: 000000000000046c RDI: 000000000000046d
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1006220b89 R12: ffff888030c94c80
R13: 000000000000000f R14: 000000000000000f R15: 0000000000000008
dir_emit include/linux/fs.h:3578 [inline]
kernfs_fop_readdir+0x578/0x950 fs/kernfs/dir.c:2000
iterate_dir+0x3a5/0x580 fs/readdir.c:110
__do_sys_getdents fs/readdir.c:319 [inline]
__se_sys_getdents+0xf1/0x270 fs/readdir.c:304
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb84e12ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb84c386028 EFLAGS: 00000246 ORIG_RAX: 000000000000004e
RAX: ffffffffffffffda RBX: 00007fb84e3a5fa0 RCX: 00007fb84e12ce59
RDX: 0000000000000ff9 RSI: 0000200000001ec0 RDI: 0000000000000004
RBP: 00007fb84e1c2d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb84e3a6038 R14: 00007fb84e3a5fa0 R15: 00007ffc96bdb6d8
loop1: detected capacity change from 0 to 40427
F2FS-fs (loop1): invalid crc value
F2FS-fs (loop1): access invalid blkaddr:0
CPU: 1 UID: 0 PID: 9164 Comm: syz.1.342 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
__f2fs_is_valid_blkaddr+0xe52/0x14f0 fs/f2fs/checkpoint.c:410
sanity_check_extent_cache+0x1a3/0x620 fs/f2fs/extent_cache.c:34
do_read_inode fs/f2fs/inode.c:541 [inline]
f2fs_iget+0x3cbd/0x5a50 fs/f2fs/inode.c:596
f2fs_fill_super+0x4fca/0x7850 fs/f2fs/super.c:5216
get_tree_bdev_flags+0x431/0x4f0 fs/super.c:1694
vfs_get_tree+0x92/0x2a0 fs/super.c:1754
fc_mount fs/namespace.c:1193 [inline]
do_new_mount_fc fs/namespace.c:3758 [inline]
do_new_mount+0x341/0xd30 fs/namespace.c:3834
do_mount fs/namespace.c:4167 [inline]
__do_sys_mount fs/namespace.c:4383 [inline]
__se_sys_mount+0x31d/0x420 fs/namespace.c:4360
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb84e12e0ca
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb84c385e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fb84c385ee0 RCX: 00007fb84e12e0ca
RDX: 0000200000000100 RSI: 0000200000000300 RDI: 00007fb84c385ea0
RBP: 0000200000000100 R08: 00007fb84c385ee0 R09: 0000000002800002
R10: 0000000002800002 R11: 0000000000000246 R12: 0000200000000300
R13: 00007fb84c385ea0 R14: 0000000000005530 R15: 00002000000001c0
F2FS-fs (loop1): sanity_check_extent_cache: inode (ino=3) extent info [0, 0, 24244] is incorrect, run fsck to fix
F2FS-fs (loop1): Failed to read root inode
----------------
Code disassembly (best guess):
0: 00 48 39 add %cl,0x39(%rax)
3: c8 48 0f 47 enter $0xf48,$0x47
7: c1 0f 01 rorl $0x1,(%rdi)
a: cb lret
b: 48 8b 4c 24 30 mov 0x30(%rsp),%rcx
10: 48 89 48 08 mov %rcx,0x8(%rax)
14: 48 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%rbp
1b: fc ff df
1e: 48 8b 44 24 28 mov 0x28(%rsp),%rax
23: 48 89 02 mov %rax,(%rdx)
26: 8b 44 24 04 mov 0x4(%rsp),%eax
* 2a: 66 89 42 10 mov %ax,0x10(%rdx) <-- trapping instruction
2e: 41 80 e7 0f and $0xf,%r15b
32: 89 c0 mov %eax,%eax
34: 44 88 7c 02 ff mov %r15b,-0x1(%rdx,%rax,1)
39: 48 89 44 24 28 mov %rax,0x28(%rsp)
3e: 42 rex.X
3f: c6 .byte 0xc6