====================================================== WARNING: possible circular locking dependency detected 6.7.0-rc1-syzkaller-00125-g7475e51b8796 #0 Not tainted ------------------------------------------------------ syz-executor.0/17816 is trying to acquire lock: ffff88803406a090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x7a/0xd0 fs/reiserfs/lock.c:27 but task is already holding lock: ffff88807fadc510 (sb_pagefaults#4){.+.+}-{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: -> #2 (sb_pagefaults#4){.+.+}-{0:0}: lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5753 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 do_shared_fault mm/memory.c:4704 [inline] do_fault mm/memory.c:4766 [inline] do_pte_missing mm/memory.c:3730 [inline] handle_pte_fault mm/memory.c:5038 [inline] __handle_mm_fault mm/memory.c:5179 [inline] handle_mm_fault+0x22e6/0x6680 mm/memory.c:5344 do_user_addr_fault arch/x86/mm/fault.c:1413 [inline] handle_page_fault arch/x86/mm/fault.c:1505 [inline] exc_page_fault+0x2ad/0x870 arch/x86/mm/fault.c:1561 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 -> #1 (&mm->mmap_lock){++++}-{3:3}: lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5753 __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+0x18e4/0x59f0 kernel/locking/lockdep.c:3868 __lock_acquire+0x1345/0x1fd0 kernel/locking/lockdep.c:5136 lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5753 __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:1941 [inline] inode_update_time fs/inode.c:1954 [inline] __file_update_time fs/inode.c:2142 [inline] file_update_time+0x39b/0x3e0 fs/inode.c:2172 filemap_page_mkwrite+0x27b/0x640 mm/filemap.c:3578 do_page_mkwrite+0x197/0x470 mm/memory.c:2943 do_shared_fault mm/memory.c:4704 [inline] do_fault mm/memory.c:4766 [inline] do_pte_missing mm/memory.c:3730 [inline] handle_pte_fault mm/memory.c:5038 [inline] __handle_mm_fault mm/memory.c:5179 [inline] handle_mm_fault+0x22e6/0x6680 mm/memory.c:5344 do_user_addr_fault arch/x86/mm/fault.c:1413 [inline] handle_page_fault arch/x86/mm/fault.c:1505 [inline] exc_page_fault+0x2ad/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 --> &mm->mmap_lock --> sb_pagefaults#4 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(sb_pagefaults#4); lock(&mm->mmap_lock); lock(sb_pagefaults#4); lock(&sbi->lock); *** DEADLOCK *** 2 locks held by syz-executor.0/17816: #0: ffff888029cab120 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline] #0: ffff888029cab120 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5371 [inline] #0: ffff888029cab120 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2d0 mm/memory.c:5431 #1: ffff88807fadc510 (sb_pagefaults#4){.+.+}-{0:0}, at: do_page_mkwrite+0x197/0x470 mm/memory.c:2943 stack backtrace: CPU: 0 PID: 17816 Comm: syz-executor.0 Not tainted 6.7.0-rc1-syzkaller-00125-g7475e51b8796 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Call Trace: __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+0x18e4/0x59f0 kernel/locking/lockdep.c:3868 __lock_acquire+0x1345/0x1fd0 kernel/locking/lockdep.c:5136 lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5753 __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:1941 [inline] inode_update_time fs/inode.c:1954 [inline] __file_update_time fs/inode.c:2142 [inline] file_update_time+0x39b/0x3e0 fs/inode.c:2172 filemap_page_mkwrite+0x27b/0x640 mm/filemap.c:3578 do_page_mkwrite+0x197/0x470 mm/memory.c:2943 do_shared_fault mm/memory.c:4704 [inline] do_fault mm/memory.c:4766 [inline] do_pte_missing mm/memory.c:3730 [inline] handle_pte_fault mm/memory.c:5038 [inline] __handle_mm_fault mm/memory.c:5179 [inline] handle_mm_fault+0x22e6/0x6680 mm/memory.c:5344 do_user_addr_fault arch/x86/mm/fault.c:1413 [inline] handle_page_fault arch/x86/mm/fault.c:1505 [inline] exc_page_fault+0x2ad/0x870 arch/x86/mm/fault.c:1561 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0033:0x7fa28105db6b Code: fa 10 73 2d 83 fa 08 73 46 83 fa 04 73 16 83 fa 01 7c 10 8a 0e 74 0a 0f b7 74 16 fe 66 89 74 17 fe 88 0f c3 8b 4c 16 fc 8b 36 <89> 4c 17 fc 89 37 c3 c5 fa 6f 06 c5 fa 6f 4c 16 f0 c5 fa 7f 07 c5 RSP: 002b:00007ffedbcf69e8 EFLAGS: 00010202 RAX: 0000000020007f80 RBX: 00007ffedbcf6af8 RCX: 0000000000737562 RDX: 0000000000000006 RSI: 0000000075622f2e RDI: 0000000020007f80 RBP: 0000000000000032 R08: 00007fa281000000 R09: 00007ffedbd400b0 R10: 00007ffedbd40080 R11: 0000000000028300 R12: 00007fa280c01660 R13: fffffffffffffffe R14: 00007fa280c00000 R15: 00007fa280c01668