======================================================
WARNING: possible circular locking dependency detected
6.1.0-rc6-syzkaller-00012-g4312098baf37 #0 Not tainted
------------------------------------------------------
syz-executor.3/7399 is trying to acquire lock:
ffff88804d410650 (sb_internal#2){.+.+}-{0:0}, at: btrfs_dirty_inode+0xcc/0x1c0 fs/btrfs/inode.c:6085
but task is already holding lock:
ffff88804d410558 (sb_pagefaults#3){.+.+}-{0:0}, at: do_page_mkwrite+0x19e/0x5e0 mm/memory.c:2978
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #5 (sb_pagefaults#3){.+.+}-{0:0}:
lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668
percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
__sb_start_write include/linux/fs.h:1826 [inline]
sb_start_pagefault include/linux/fs.h:1930 [inline]
btrfs_page_mkwrite+0x1ea/0xc80 fs/btrfs/inode.c:8415
do_page_mkwrite+0x19e/0x5e0 mm/memory.c:2978
do_shared_fault mm/memory.c:4619 [inline]
do_fault mm/memory.c:4687 [inline]
handle_pte_fault mm/memory.c:4955 [inline]
__handle_mm_fault mm/memory.c:5097 [inline]
handle_mm_fault+0x1c63/0x3630 mm/memory.c:5218
do_user_addr_fault+0x69b/0xcb0 arch/x86/mm/fault.c:1428
handle_page_fault arch/x86/mm/fault.c:1519 [inline]
exc_page_fault+0x7a/0x110 arch/x86/mm/fault.c:1575
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570
-> #4 (&mm->mmap_lock#2){++++}-{3:3}:
lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668
__might_fault+0xb2/0x110 mm/memory.c:5646
_copy_to_user+0x26/0x130 lib/usercopy.c:29
copy_to_user include/linux/uaccess.h:169 [inline]
btrfs_ioctl_get_subvol_rootref+0x8cf/0xa90 fs/btrfs/ioctl.c:3203
btrfs_ioctl+0xb7c/0xc10 fs/btrfs/ioctl.c:5556
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
-> #3 (btrfs-root-00){++++}-{3:3}:
lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668
down_read_nested+0x3c/0x50 kernel/locking/rwsem.c:1634
__btrfs_tree_read_lock fs/btrfs/locking.c:134 [inline]
btrfs_tree_read_lock fs/btrfs/locking.c:140 [inline]
btrfs_read_lock_root_node+0x2b4/0x400 fs/btrfs/locking.c:279
btrfs_search_slot_get_root fs/btrfs/ctree.c:1665 [inline]
btrfs_search_slot+0x495/0x2fe0 fs/btrfs/ctree.c:1985
btrfs_del_root+0x83/0x120 fs/btrfs/root-tree.c:317
btrfs_clear_free_space_tree+0x5a7/0xbd0 fs/btrfs/free-space-tree.c:1273
btrfs_start_pre_rw_mount+0x2a7/0x660 fs/btrfs/disk-io.c:3210
open_ctree+0x27e6/0x2d6d fs/btrfs/disk-io.c:3792
btrfs_fill_super+0x1c6/0x2d0 fs/btrfs/super.c:1461
btrfs_mount_root+0x885/0x9a0 fs/btrfs/super.c:1829
legacy_get_tree+0xea/0x180 fs/fs_context.c:610
vfs_get_tree+0x88/0x270 fs/super.c:1531
fc_mount fs/namespace.c:1043 [inline]
vfs_kern_mount+0xc9/0x160 fs/namespace.c:1073
btrfs_mount+0x3d3/0xbb0 fs/btrfs/super.c:1889
legacy_get_tree+0xea/0x180 fs/fs_context.c:610
vfs_get_tree+0x88/0x270 fs/super.c:1531
do_new_mount+0x289/0xad0 fs/namespace.c:3040
do_mount fs/namespace.c:3383 [inline]
__do_sys_mount fs/namespace.c:3591 [inline]
__se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
-> #2 (btrfs_trans_num_extwriters){++++}-{0:0}:
lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668
join_transaction+0x19f/0xe60 fs/btrfs/transaction.c:299
start_transaction+0x6fb/0x1180 fs/btrfs/transaction.c:658
btrfs_create_common+0x2c6/0x420 fs/btrfs/inode.c:6633
lookup_open fs/namei.c:3413 [inline]
open_last_lookups fs/namei.c:3481 [inline]
path_openat+0x12d0/0x2df0 fs/namei.c:3710
do_filp_open+0x264/0x4f0 fs/namei.c:3740
do_sys_openat2+0x124/0x4e0 fs/open.c:1310
do_sys_open fs/open.c:1326 [inline]
__do_sys_open fs/open.c:1334 [inline]
__se_sys_open fs/open.c:1330 [inline]
__x64_sys_open+0x221/0x270 fs/open.c:1330
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
-> #1 (btrfs_trans_num_writers){++++}-{0:0}:
lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668
join_transaction+0x17a/0xe60 fs/btrfs/transaction.c:298
start_transaction+0x6fb/0x1180 fs/btrfs/transaction.c:658
btrfs_create_common+0x2c6/0x420 fs/btrfs/inode.c:6633
lookup_open fs/namei.c:3413 [inline]
open_last_lookups fs/namei.c:3481 [inline]
path_openat+0x12d0/0x2df0 fs/namei.c:3710
do_filp_open+0x264/0x4f0 fs/namei.c:3740
do_sys_openat2+0x124/0x4e0 fs/open.c:1310
do_sys_open fs/open.c:1326 [inline]
__do_sys_open fs/open.c:1334 [inline]
__se_sys_open fs/open.c:1330 [inline]
__x64_sys_open+0x221/0x270 fs/open.c:1330
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
-> #0 (sb_internal#2){.+.+}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3097 [inline]
check_prevs_add kernel/locking/lockdep.c:3216 [inline]
validate_chain+0x1898/0x6ae0 kernel/locking/lockdep.c:3831
__lock_acquire+0x1292/0x1f60 kernel/locking/lockdep.c:5055
lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668
percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
__sb_start_write include/linux/fs.h:1826 [inline]
sb_start_intwrite include/linux/fs.h:1948 [inline]
start_transaction+0x5cb/0x1180 fs/btrfs/transaction.c:652
btrfs_dirty_inode+0xcc/0x1c0 fs/btrfs/inode.c:6085
inode_update_time fs/inode.c:1871 [inline]
__file_update_time fs/inode.c:2088 [inline]
file_update_time+0x3df/0x5d0 fs/inode.c:2119
btrfs_page_mkwrite+0x3a8/0xc80 fs/btrfs/inode.c:8431
do_page_mkwrite+0x19e/0x5e0 mm/memory.c:2978
do_shared_fault mm/memory.c:4619 [inline]
do_fault mm/memory.c:4687 [inline]
handle_pte_fault mm/memory.c:4955 [inline]
__handle_mm_fault mm/memory.c:5097 [inline]
handle_mm_fault+0x1c63/0x3630 mm/memory.c:5218
do_user_addr_fault+0x69b/0xcb0 arch/x86/mm/fault.c:1428
handle_page_fault arch/x86/mm/fault.c:1519 [inline]
exc_page_fault+0x7a/0x110 arch/x86/mm/fault.c:1575
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570
other info that might help us debug this:
Chain exists of:
sb_internal#2 --> &mm->mmap_lock#2 --> sb_pagefaults#3
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(sb_pagefaults#3);
lock(&mm->mmap_lock#2);
lock(sb_pagefaults#3);
lock(sb_internal#2);
*** DEADLOCK ***
2 locks held by syz-executor.3/7399:
#0: ffff88807e244298 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_read_lock+0x17/0x50 include/linux/mmap_lock.h:117
#1: ffff88804d410558 (sb_pagefaults#3){.+.+}-{0:0}, at: do_page_mkwrite+0x19e/0x5e0 mm/memory.c:2978
stack backtrace:
CPU: 1 PID: 7399 Comm: syz-executor.3 Not tainted 6.1.0-rc6-syzkaller-00012-g4312098baf37 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106
check_noncircular+0x2cc/0x390 kernel/locking/lockdep.c:2177
check_prev_add kernel/locking/lockdep.c:3097 [inline]
check_prevs_add kernel/locking/lockdep.c:3216 [inline]
validate_chain+0x1898/0x6ae0 kernel/locking/lockdep.c:3831
__lock_acquire+0x1292/0x1f60 kernel/locking/lockdep.c:5055
lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668
percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
__sb_start_write include/linux/fs.h:1826 [inline]
sb_start_intwrite include/linux/fs.h:1948 [inline]
start_transaction+0x5cb/0x1180 fs/btrfs/transaction.c:652
btrfs_dirty_inode+0xcc/0x1c0 fs/btrfs/inode.c:6085
inode_update_time fs/inode.c:1871 [inline]
__file_update_time fs/inode.c:2088 [inline]
file_update_time+0x3df/0x5d0 fs/inode.c:2119
btrfs_page_mkwrite+0x3a8/0xc80 fs/btrfs/inode.c:8431
do_page_mkwrite+0x19e/0x5e0 mm/memory.c:2978
do_shared_fault mm/memory.c:4619 [inline]
do_fault mm/memory.c:4687 [inline]
handle_pte_fault mm/memory.c:4955 [inline]
__handle_mm_fault mm/memory.c:5097 [inline]
handle_mm_fault+0x1c63/0x3630 mm/memory.c:5218
do_user_addr_fault+0x69b/0xcb0 arch/x86/mm/fault.c:1428
handle_page_fault arch/x86/mm/fault.c:1519 [inline]
exc_page_fault+0x7a/0x110 arch/x86/mm/fault.c:1575
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0033:0x7ffacd22bd79
Code: 48 8b 04 24 48 85 c0 74 17 48 8b 54 24 18 48 0f ca 48 89 54 24 18 48 83 f8 01 0f 85 9b 02 00 00 48 8b 44 24 10 48 8b 54 24 18 <48> 89 10 e9 c2 fd ff ff 48 8b 44 24 10 0f b7 10 48 8b 04 24 48 85
RSP: 002b:00007ffc0e7eacc0 EFLAGS: 00010246
RAX: 0000000020000100 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000020000000 RSI: 0000000000000000 RDI: 00005555563172e8
RBP: 00007ffc0e7eadb8 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffacce05bd0 R11: 0000000000000246 R12: 0000000000071914
R13: 00007ffc0e7eade0 R14: 00007ffacd3abf80 R15: 0000000000000032
</TASK>