====================================================== WARNING: possible circular locking dependency detected 6.2.0-rc4-syzkaller-00031-g6e50979a9c87 #0 Not tainted ------------------------------------------------------ syz-executor.0/11390 is trying to acquire lock: ffff88804ed0b090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x77/0xd0 fs/reiserfs/lock.c:27 but task is already holding lock: ffff88801d666558 (sb_pagefaults#6){.+.+}-{0:0}, at: do_page_mkwrite+0x19e/0x5e0 mm/memory.c:2947 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (sb_pagefaults#6){.+.+}-{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:1814 [inline] sb_start_pagefault include/linux/fs.h:1918 [inline] filemap_page_mkwrite+0x15c/0x7a0 mm/filemap.c:3439 do_page_mkwrite+0x19e/0x5e0 mm/memory.c:2947 wp_page_shared+0x15e/0x380 mm/memory.c:3295 handle_pte_fault mm/memory.c:4949 [inline] __handle_mm_fault mm/memory.c:5073 [inline] handle_mm_fault+0x1b79/0x26b0 mm/memory.c:5219 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 -> #1 (&mm->mmap_lock){++++}-{3:3}: lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668 __might_fault+0xb2/0x110 mm/memory.c:5647 reiserfs_ioctl+0x11c/0x340 fs/reiserfs/ioctl.c:96 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 -> #0 (&sbi->lock){+.+.}-{3:3}: 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 __mutex_lock_common+0x1bd/0x26e0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799 reiserfs_write_lock+0x77/0xd0 fs/reiserfs/lock.c:27 reiserfs_dirty_inode+0xdf/0x230 fs/reiserfs/super.c:704 __mark_inode_dirty+0x1e7/0x600 fs/fs-writeback.c:2419 generic_update_time fs/inode.c:1859 [inline] inode_update_time fs/inode.c:1872 [inline] __file_update_time fs/inode.c:2057 [inline] file_update_time+0x551/0x5d0 fs/inode.c:2088 filemap_page_mkwrite+0x248/0x7a0 mm/filemap.c:3440 do_page_mkwrite+0x19e/0x5e0 mm/memory.c:2947 wp_page_shared+0x15e/0x380 mm/memory.c:3295 handle_pte_fault mm/memory.c:4949 [inline] __handle_mm_fault mm/memory.c:5073 [inline] handle_mm_fault+0x1b79/0x26b0 mm/memory.c:5219 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: &sbi->lock --> &mm->mmap_lock --> sb_pagefaults#6 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sb_pagefaults#6); lock(&mm->mmap_lock); lock(sb_pagefaults#6); lock(&sbi->lock); *** DEADLOCK *** 2 locks held by syz-executor.0/11390: #0: ffff88807c278a18 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline] #0: ffff88807c278a18 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault+0x2e2/0xcb0 arch/x86/mm/fault.c:1369 #1: ffff88801d666558 (sb_pagefaults#6){.+.+}-{0:0}, at: do_page_mkwrite+0x19e/0x5e0 mm/memory.c:2947 stack backtrace: CPU: 1 PID: 11390 Comm: syz-executor.0 Not tainted 6.2.0-rc4-syzkaller-00031-g6e50979a9c87 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x290 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 __mutex_lock_common+0x1bd/0x26e0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799 reiserfs_write_lock+0x77/0xd0 fs/reiserfs/lock.c:27 reiserfs_dirty_inode+0xdf/0x230 fs/reiserfs/super.c:704 __mark_inode_dirty+0x1e7/0x600 fs/fs-writeback.c:2419 generic_update_time fs/inode.c:1859 [inline] inode_update_time fs/inode.c:1872 [inline] __file_update_time fs/inode.c:2057 [inline] file_update_time+0x551/0x5d0 fs/inode.c:2088 filemap_page_mkwrite+0x248/0x7a0 mm/filemap.c:3440 do_page_mkwrite+0x19e/0x5e0 mm/memory.c:2947 wp_page_shared+0x15e/0x380 mm/memory.c:3295 handle_pte_fault mm/memory.c:4949 [inline] __handle_mm_fault mm/memory.c:5073 [inline] handle_mm_fault+0x1b79/0x26b0 mm/memory.c:5219 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: 0033:0x7f612e486c25 Code: 12 80 fa 04 73 1e 80 fa 01 77 26 72 05 0f b6 0e 88 0f c3 48 8b 4c 16 f8 48 8b 36 48 89 4c 17 f8 48 89 37 c3 8b 4c 16 fc 8b 36 <89> 4c 17 fc 89 37 c3 0f b7 4c 16 fe 0f b7 36 66 89 4c 17 fe 66 89 RSP: 002b:00007fffde6d42c8 EFLAGS: 00010202 RAX: 0000000020002000 RBX: 0000000000000000 RCX: 0000000000737562 RDX: 0000000000000006 RSI: 0000000075622f2e RDI: 0000000020002000 RBP: 00007fffde6d4388 R08: 00007f612e400000 R09: 00007f612e000000 R10: 00007f612e001418 R11: 0000000000000246 R12: 000000000005ebe9 R13: 00007fffde6d43b0 R14: 00007f612e5ac050 R15: 0000000000000032