======================================================
WARNING: possible circular locking dependency detected
6.7.0-rc4-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor940/5125 is trying to acquire lock:
ffff888140681090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x7a/0xd0 fs/reiserfs/lock.c:27

but task is already holding lock:
ffff88807afca510 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x197/0x470 mm/memory.c:2943

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (sb_pagefaults){.+.+}-{0:0}:
       lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754
       percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
       __sb_start_write include/linux/fs.h:1635 [inline]
       sb_start_pagefault include/linux/fs.h:1739 [inline]
       filemap_page_mkwrite+0x16f/0x640 mm/filemap.c:3577
       do_page_mkwrite+0x197/0x470 mm/memory.c:2943
       wp_page_shared mm/memory.c:3338 [inline]
       do_wp_page+0x1d07/0x4d40 mm/memory.c:3478
       handle_pte_fault mm/memory.c:5054 [inline]
       __handle_mm_fault mm/memory.c:5179 [inline]
       handle_mm_fault+0x1b1c/0x6680 mm/memory.c:5344
       do_user_addr_fault arch/x86/mm/fault.c:1364 [inline]
       handle_page_fault arch/x86/mm/fault.c:1505 [inline]
       exc_page_fault+0x456/0x870 arch/x86/mm/fault.c:1561
       asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570

-> #2 (&vma->vm_lock->lock){++++}-{3:3}:
       lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754
       down_write+0x3a/0x50 kernel/locking/rwsem.c:1579
       vma_start_write include/linux/mm.h:716 [inline]
       vma_link+0x2c9/0x540 mm/mmap.c:404
       insert_vm_struct+0x19f/0x260 mm/mmap.c:3378
       __bprm_mm_init fs/exec.c:281 [inline]
       bprm_mm_init fs/exec.c:383 [inline]
       alloc_bprm+0x4d5/0x900 fs/exec.c:1532
       kernel_execve+0x96/0xa20 fs/exec.c:1987
       call_usermodehelper_exec_async+0x233/0x370 kernel/umh.c:110
       ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
       ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

-> #1 (&mm->mmap_lock){++++}-{3:3}:
       lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754
       __might_fault+0xc1/0x120 mm/memory.c:5955
       reiserfs_ioctl+0x125/0x2f0 fs/reiserfs/ioctl.c:96
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:871 [inline]
       __se_sys_ioctl+0xf8/0x170 fs/ioctl.c:857
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x45/0x110 arch/x86/entry/common.c:82
       entry_SYSCALL_64_after_hwframe+0x63/0x6b

-> #0 (&sbi->lock){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain+0x1909/0x5ab0 kernel/locking/lockdep.c:3869
       __lock_acquire+0x1345/0x1fd0 kernel/locking/lockdep.c:5137
       lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754
       __mutex_lock_common kernel/locking/mutex.c:603 [inline]
       __mutex_lock+0x136/0xd60 kernel/locking/mutex.c:747
       reiserfs_write_lock+0x7a/0xd0 fs/reiserfs/lock.c:27
       reiserfs_dirty_inode+0xf2/0x240 fs/reiserfs/super.c:704
       __mark_inode_dirty+0x305/0xda0 fs/fs-writeback.c:2452
       generic_update_time fs/inode.c:1943 [inline]
       inode_update_time fs/inode.c:1956 [inline]
       __file_update_time fs/inode.c:2144 [inline]
       file_update_time+0x39b/0x3e0 fs/inode.c:2174
       filemap_page_mkwrite+0x27b/0x640 mm/filemap.c:3578
       do_page_mkwrite+0x197/0x470 mm/memory.c:2943
       wp_page_shared mm/memory.c:3338 [inline]
       do_wp_page+0x1d07/0x4d40 mm/memory.c:3478
       handle_pte_fault mm/memory.c:5054 [inline]
       __handle_mm_fault mm/memory.c:5179 [inline]
       handle_mm_fault+0x1b1c/0x6680 mm/memory.c:5344
       do_user_addr_fault arch/x86/mm/fault.c:1364 [inline]
       handle_page_fault arch/x86/mm/fault.c:1505 [inline]
       exc_page_fault+0x456/0x870 arch/x86/mm/fault.c:1561
       asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570

other info that might help us debug this:

Chain exists of:
  &sbi->lock --> &vma->vm_lock->lock --> sb_pagefaults

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  rlock(sb_pagefaults);
                               lock(&vma->vm_lock->lock);
                               lock(sb_pagefaults);
  lock(&sbi->lock);

 *** DEADLOCK ***

2 locks held by syz-executor940/5125:
 #0: ffff88807a51aec8 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read include/linux/mm.h:663 [inline]
 #0: ffff88807a51aec8 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x2f6/0x6f0 mm/memory.c:5500
 #1: ffff88807afca510 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x197/0x470 mm/memory.c:2943

stack backtrace:
CPU: 0 PID: 5125 Comm: syz-executor940 Not tainted 6.7.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 check_noncircular+0x366/0x490 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+0x1909/0x5ab0 kernel/locking/lockdep.c:3869
 __lock_acquire+0x1345/0x1fd0 kernel/locking/lockdep.c:5137
 lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754
 __mutex_lock_common kernel/locking/mutex.c:603 [inline]
 __mutex_lock+0x136/0xd60 kernel/locking/mutex.c:747
 reiserfs_write_lock+0x7a/0xd0 fs/reiserfs/lock.c:27
 reiserfs_dirty_inode+0xf2/0x240 fs/reiserfs/super.c:704
 __mark_inode_dirty+0x305/0xda0 fs/fs-writeback.c:2452
 generic_update_time fs/inode.c:1943 [inline]
 inode_update_time fs/inode.c:1956 [inline]
 __file_update_time fs/inode.c:2144 [inline]
 file_update_time+0x39b/0x3e0 fs/inode.c:2174
 filemap_page_mkwrite+0x27b/0x640 mm/filemap.c:3578
 do_page_mkwrite+0x197/0x470 mm/memory.c:2943
 wp_page_shared mm/memory.c:3338 [inline]
 do_wp_page+0x1d07/0x4d40 mm/memory.c:3478
 handle_pte_fault mm/memory.c:5054 [inline]
 __handle_mm_fault mm/memory.c:5179 [inline]
 handle_mm_fault+0x1b1c/0x6680 mm/memory.c:5344
 do_user_addr_fault arch/x86/mm/fault.c:1364 [inline]
 handle_page_fault arch/x86/mm/fault.c:1505 [inline]
 exc_page_fault+0x456/0x870 arch/x86/mm/fault.c:1561
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0033:0x7f97996f8e64
Code: 8b 0d d0 d2 0a 00 50 be 00 00 00 20 bf 09 00 00 00 31 c0 48 b9 92 c1 2b 12 ad e3 88 80 6a 00 e8 b2 43 03 00 31 d2 31 c9 31 f6 <89> 14 25 04 01 00 20 bf a9 01 00 00 31 c0 89 14 25 08 01 00 20 89
RSP: 002b:00007ffdadc34f70 EFLAGS: 00010246
RAX: 0000000020000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000000
RBP: 0000000000000000 R08: 0000000000000006 R09: 0000000000000000
R10: 0000000004002011 R11: 0000000000000246 R12: 00007ffdadc34f9c
R13: 0000000000000022 R14: 431bde82d7b634db R15: 00007ffdadc34fd0
 </TASK>