BTRFS info (device loop1): using sha256 checksum algorithm
BTRFS info (device loop1): enabling ssd optimizations
BTRFS info (device loop1): turning on async discard
BTRFS info (device loop1): enabling free space tree
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.1.1216/13867 is trying to acquire lock:
ffff88803120e5f8 (sb_pagefaults#10){.+.+}-{0:0}, at: do_page_mkwrite+0x150/0x310 mm/memory.c:3531
but task is already holding lock:
ffff888019e87238 (&root->kernfs_rwsem){++++}-{4:4}, at: kernfs_fop_readdir+0x275/0x8d0 fs/kernfs/dir.c:1898
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&root->kernfs_rwsem){++++}-{4:4}:
down_write+0x3a/0x50 kernel/locking/rwsem.c:1590
kernfs_add_one+0x41/0x5c0 fs/kernfs/dir.c:796
kernfs_create_dir_ns+0xde/0x130 fs/kernfs/dir.c:1098
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_add+0x163/0x240 lib/kobject.c:426
btrfs_sysfs_add_block_group_type+0x243/0x6c0 fs/btrfs/sysfs.c:1866
btrfs_create_pending_block_groups+0xd3d/0x1a00 fs/btrfs/block-group.c:2877
__btrfs_end_transaction+0x140/0x640 fs/btrfs/transaction.c:1080
btrfs_inc_block_group_ro+0x63e/0x6f0 fs/btrfs/block-group.c:3151
btrfs_relocate_block_group+0x26d/0x980 fs/btrfs/relocation.c:5350
btrfs_relocate_chunk+0x10f/0x820 fs/btrfs/volumes.c:3590
__btrfs_balance+0x1aec/0x26e0 fs/btrfs/volumes.c:4486
btrfs_balance+0xafa/0x11f0 fs/btrfs/volumes.c:4873
btrfs_ioctl_balance+0x3d6/0x610 fs/btrfs/ioctl.c:3446
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+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #2 (btrfs_trans_num_extwriters){++++}-{0:0}:
join_transaction+0x1a4/0xc90 fs/btrfs/transaction.c:323
start_transaction+0x6b9/0x15f0 fs/btrfs/transaction.c:708
btrfs_rebuild_free_space_tree+0xbb/0x6e0 fs/btrfs/free-space-tree.c:1328
btrfs_start_pre_rw_mount+0x1529/0x1f20 fs/btrfs/disk-io.c:3061
open_ctree+0x2e04/0x4220 fs/btrfs/disk-io.c:3653
btrfs_fill_super fs/btrfs/super.c:981 [inline]
btrfs_get_tree_super fs/btrfs/super.c:1944 [inline]
btrfs_get_tree_subvol fs/btrfs/super.c:2087 [inline]
btrfs_get_tree+0x1061/0x1930 fs/btrfs/super.c:2121
vfs_get_tree+0x92/0x2a0 fs/super.c:1754
fc_mount fs/namespace.c:1193 [inline]
do_new_mount_fc fs/namespace.c:3760 [inline]
do_new_mount+0x341/0xd30 fs/namespace.c:3836
do_mount fs/namespace.c:4159 [inline]
__do_sys_mount fs/namespace.c:4348 [inline]
__se_sys_mount+0x31d/0x420 fs/namespace.c:4325
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 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+0x199/0x3a0 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+0x248/0x640 fs/btrfs/transaction.c:1085
btrfs_dirty_inode+0x14c/0x190 fs/btrfs/inode.c:6423
file_update_time_flags+0x2d5/0x4b0 fs/inode.c:2417
btrfs_page_mkwrite+0x5df/0x1b10 fs/btrfs/file.c:1914
do_page_mkwrite+0x150/0x310 mm/memory.c:3531
do_shared_fault mm/memory.c:5834 [inline]
do_fault mm/memory.c:5896 [inline]
do_pte_missing+0x763/0x2e60 mm/memory.c:4404
handle_pte_fault mm/memory.c:6276 [inline]
__handle_mm_fault mm/memory.c:6414 [inline]
handle_mm_fault+0xd0a/0x13c0 mm/memory.c:6583
do_user_addr_fault+0x75b/0x1360 arch/x86/mm/fault.c:1385
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
-> #0 (sb_pagefaults#10){.+.+}-{0:0}:
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+0x106/0x330 kernel/locking/lockdep.c:5868
percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline]
percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
__sb_start_write include/linux/fs/super.h:19 [inline]
sb_start_pagefault include/linux/fs/super.h:159 [inline]
btrfs_page_mkwrite+0x329/0x1b10 fs/btrfs/file.c:1873
do_page_mkwrite+0x150/0x310 mm/memory.c:3531
do_shared_fault mm/memory.c:5834 [inline]
do_fault mm/memory.c:5896 [inline]
do_pte_missing+0x763/0x2e60 mm/memory.c:4404
handle_pte_fault mm/memory.c:6276 [inline]
__handle_mm_fault mm/memory.c:6414 [inline]
handle_mm_fault+0xd0a/0x13c0 mm/memory.c:6583
do_user_addr_fault+0x75b/0x1360 arch/x86/mm/fault.c:1385
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
user_access_begin arch/x86/include/asm/uaccess.h:-1 [inline]
filldir64+0x29c/0x670 fs/readdir.c:374
dir_emit include/linux/fs.h:3557 [inline]
kernfs_fop_readdir+0x57e/0x8d0 fs/kernfs/dir.c:1915
iterate_dir+0x3a5/0x580 fs/readdir.c:108
__do_sys_getdents64 fs/readdir.c:412 [inline]
__se_sys_getdents64+0xf1/0x280 fs/readdir.c:397
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 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:
sb_pagefaults#10 --> btrfs_trans_num_extwriters --> &root->kernfs_rwsem
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
rlock(&root->kernfs_rwsem);
lock(btrfs_trans_num_extwriters);
lock(&root->kernfs_rwsem);
rlock(sb_pagefaults#10);
*** DEADLOCK ***
4 locks held by syz.1.1216/13867:
#0: ffff8880340b0728 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x252/0x320 fs/file.c:1255
#1: ffff888060d648f8 (&type->i_mutex_dir_key#4){++++}-{4:4}, at: iterate_dir+0x29e/0x580 fs/readdir.c:101
#2: ffff888019e87238 (&root->kernfs_rwsem){++++}-{4:4}, at: kernfs_fop_readdir+0x275/0x8d0 fs/kernfs/dir.c:1898
#3: ffff88813fe5c370 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_trylock include/linux/mmap_lock.h:410 [inline]
#3: ffff88813fe5c370 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/mmap_lock.c:390 [inline]
#3: ffff88813fe5c370 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x36/0x340 mm/mmap_lock.c:450
stack backtrace:
CPU: 0 UID: 0 PID: 13867 Comm: syz.1.1216 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
<TASK>
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+0x106/0x330 kernel/locking/lockdep.c:5868
percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline]
percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
__sb_start_write include/linux/fs/super.h:19 [inline]
sb_start_pagefault include/linux/fs/super.h:159 [inline]
btrfs_page_mkwrite+0x329/0x1b10 fs/btrfs/file.c:1873
do_page_mkwrite+0x150/0x310 mm/memory.c:3531
do_shared_fault mm/memory.c:5834 [inline]
do_fault mm/memory.c:5896 [inline]
do_pte_missing+0x763/0x2e60 mm/memory.c:4404
handle_pte_fault mm/memory.c:6276 [inline]
__handle_mm_fault mm/memory.c:6414 [inline]
handle_mm_fault+0xd0a/0x13c0 mm/memory.c:6583
do_user_addr_fault+0x75b/0x1360 arch/x86/mm/fault.c:1385
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:filldir64+0x29c/0x670 fs/readdir.c:378
Code: 87 ff 4c 89 ff 4c 89 e6 e8 c1 c8 87 ff 4d 39 e7 0f 82 5b 02 00 00 49 39 ef 0f 87 52 02 00 00 0f 01 cb 0f ae e8 48 8b 44 24 50 <49> 89 44 24 08 48 8b 4c 24 08 48 8b 44 24 58 48 89 01 48 8b 04 24
RSP: 0018:ffffc90004547c40 EFLAGS: 00050283
RAX: 000000002208a51e RBX: ffffc90004547e38 RCX: ffff88802dcdda00
RDX: 0000000000000002 RSI: 0000200000002fc0 RDI: 0000200000002fe0
RBP: 00007ffffffff000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffffff823b4ce0 R12: 0000200000002fc0
R13: ffffffff8b2bfca0 R14: 0000000000000006 R15: 0000200000002fe0
dir_emit include/linux/fs.h:3557 [inline]
kernfs_fop_readdir+0x57e/0x8d0 fs/kernfs/dir.c:1915
iterate_dir+0x3a5/0x580 fs/readdir.c:108
__do_sys_getdents64 fs/readdir.c:412 [inline]
__se_sys_getdents64+0xf1/0x280 fs/readdir.c:397
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f03c9dcc629
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:00007f03c8026028 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007f03ca045fa0 RCX: 00007f03c9dcc629
RDX: 000000000000100c RSI: 0000200000002fc0 RDI: 0000000000000009
RBP: 00007f03c9e62b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f03ca046038 R14: 00007f03ca045fa0 R15: 00007ffcd6e4f9f8
</TASK>
----------------
Code disassembly (best guess):
0: 87 ff xchg %edi,%edi
2: 4c 89 ff mov %r15,%rdi
5: 4c 89 e6 mov %r12,%rsi
8: e8 c1 c8 87 ff call 0xff87c8ce
d: 4d 39 e7 cmp %r12,%r15
10: 0f 82 5b 02 00 00 jb 0x271
16: 49 39 ef cmp %rbp,%r15
19: 0f 87 52 02 00 00 ja 0x271
1f: 0f 01 cb stac
22: 0f ae e8 lfence
25: 48 8b 44 24 50 mov 0x50(%rsp),%rax
* 2a: 49 89 44 24 08 mov %rax,0x8(%r12) <-- trapping instruction
2f: 48 8b 4c 24 08 mov 0x8(%rsp),%rcx
34: 48 8b 44 24 58 mov 0x58(%rsp),%rax
39: 48 89 01 mov %rax,(%rcx)
3c: 48 8b 04 24 mov (%rsp),%rax