====================================================== WARNING: possible circular locking dependency detected 6.7.0-rc8-syzkaller-g0802e17d9aca #0 Not tainted ------------------------------------------------------ syz-executor.3/15046 is trying to acquire lock: ffff0000d9609090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x7c/0xe8 fs/reiserfs/lock.c:27 but task is already holding lock: ffff0000ce84b990 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:124 [inline] ffff0000ce84b990 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x154/0x3d4 mm/util.c:554 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&mm->mmap_lock){++++}-{3:3}: __might_fault+0xc4/0x124 mm/memory.c:5956 reiserfs_ioctl+0x110/0x42c fs/reiserfs/ioctl.c:96 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl fs/ioctl.c:857 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:857 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 -> #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 kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x3384/0x763c kernel/locking/lockdep.c:5137 lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5754 __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799 reiserfs_write_lock+0x7c/0xe8 fs/reiserfs/lock.c:27 reiserfs_dirty_inode+0xe4/0x204 fs/reiserfs/super.c:704 __mark_inode_dirty+0x2b0/0x10f4 fs/fs-writeback.c:2452 generic_update_time fs/inode.c:1943 [inline] inode_update_time fs/inode.c:1956 [inline] touch_atime+0x620/0xae4 fs/inode.c:2028 file_accessed include/linux/fs.h:2360 [inline] generic_file_mmap+0xb0/0x11c mm/filemap.c:3620 call_mmap include/linux/fs.h:2025 [inline] mmap_region+0xc20/0x19cc mm/mmap.c:2851 do_mmap+0x9dc/0xfd8 mm/mmap.c:1379 vm_mmap_pgoff+0x1a0/0x3d4 mm/util.c:556 ksys_mmap_pgoff+0x3c8/0x5b0 mm/mmap.c:1425 __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline] __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline] __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&mm->mmap_lock); lock(&sbi->lock); lock(&mm->mmap_lock); lock(&sbi->lock); *** DEADLOCK *** 2 locks held by syz-executor.3/15046: #0: ffff0000ce84b990 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:124 [inline] #0: ffff0000ce84b990 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x154/0x3d4 mm/util.c:554 #1: ffff0000d9760418 (sb_writers#18){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2360 [inline] #1: ffff0000d9760418 (sb_writers#18){.+.+}-{0:0}, at: generic_file_mmap+0xb0/0x11c mm/filemap.c:3620 stack backtrace: CPU: 1 PID: 15046 Comm: syz-executor.3 Not tainted 6.7.0-rc8-syzkaller-g0802e17d9aca #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:291 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:298 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 dump_stack+0x1c/0x28 lib/dump_stack.c:113 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2060 check_noncircular+0x310/0x404 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 kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x3384/0x763c kernel/locking/lockdep.c:5137 lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5754 __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799 reiserfs_write_lock+0x7c/0xe8 fs/reiserfs/lock.c:27 reiserfs_dirty_inode+0xe4/0x204 fs/reiserfs/super.c:704 __mark_inode_dirty+0x2b0/0x10f4 fs/fs-writeback.c:2452 generic_update_time fs/inode.c:1943 [inline] inode_update_time fs/inode.c:1956 [inline] touch_atime+0x620/0xae4 fs/inode.c:2028 file_accessed include/linux/fs.h:2360 [inline] generic_file_mmap+0xb0/0x11c mm/filemap.c:3620 call_mmap include/linux/fs.h:2025 [inline] mmap_region+0xc20/0x19cc mm/mmap.c:2851 do_mmap+0x9dc/0xfd8 mm/mmap.c:1379 vm_mmap_pgoff+0x1a0/0x3d4 mm/util.c:556 ksys_mmap_pgoff+0x3c8/0x5b0 mm/mmap.c:1425 __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline] __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline] __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595