====================================================== WARNING: possible circular locking dependency detected 6.8.0-rc2-syzkaller-g41bccc98fb79 #0 Not tainted ------------------------------------------------------ syz-executor.1/10296 is trying to acquire lock: ffff0000da506090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x7c/0xe8 fs/reiserfs/lock.c:27 but task is already holding lock: ffff0000faef4518 (sb_pagefaults#2){.+.+}-{0:0}, at: do_page_mkwrite+0x140/0x2dc mm/memory.c:2966 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (sb_pagefaults#2){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1639 [inline] sb_start_pagefault include/linux/fs.h:1804 [inline] filemap_page_mkwrite+0x14c/0x920 mm/filemap.c:3589 do_page_mkwrite+0x140/0x2dc mm/memory.c:2966 wp_page_shared mm/memory.c:3353 [inline] do_wp_page+0x176c/0x323c mm/memory.c:3493 handle_pte_fault mm/memory.c:5160 [inline] __handle_mm_fault mm/memory.c:5285 [inline] handle_mm_fault+0x1124/0x57dc mm/memory.c:5450 do_page_fault+0x32c/0xa64 arch/arm64/mm/fault.c:601 do_mem_abort+0x74/0x200 arch/arm64/mm/fault.c:848 el0_da+0x60/0x168 arch/arm64/kernel/entry-common.c:546 el0t_64_sync_handler+0xcc/0xfc arch/arm64/kernel/entry-common.c:699 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 -> #2 (&vma->vm_lock->lock){++++}-{3:3}: down_write+0x50/0xc0 kernel/locking/rwsem.c:1579 vma_start_write include/linux/mm.h:716 [inline] vma_link+0x268/0x4bc mm/mmap.c:404 insert_vm_struct+0x2bc/0x3c0 mm/mmap.c:3349 __bprm_mm_init fs/exec.c:282 [inline] bprm_mm_init fs/exec.c:384 [inline] alloc_bprm+0x488/0x934 fs/exec.c:1580 kernel_execve+0xa4/0x7e8 fs/exec.c:2009 run_init_process+0x1bc/0x1ec init/main.c:1357 try_to_run_init_process init/main.c:1364 [inline] kernel_init+0xd8/0x29c init/main.c:1497 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 -> #1 (&mm->mmap_lock){++++}-{3:3}: __might_fault+0xc4/0x124 mm/memory.c:6060 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:598 -> #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:608 __mutex_lock kernel/locking/mutex.c:752 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804 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:1905 [inline] inode_update_time fs/inode.c:1918 [inline] __file_update_time fs/inode.c:2106 [inline] file_update_time+0x184/0x1ac fs/inode.c:2136 filemap_page_mkwrite+0x2f8/0x920 mm/filemap.c:3590 do_page_mkwrite+0x140/0x2dc mm/memory.c:2966 wp_page_shared mm/memory.c:3353 [inline] do_wp_page+0x176c/0x323c mm/memory.c:3493 handle_pte_fault mm/memory.c:5160 [inline] __handle_mm_fault mm/memory.c:5285 [inline] handle_mm_fault+0x1124/0x57dc mm/memory.c:5450 do_page_fault+0x32c/0xa64 arch/arm64/mm/fault.c:601 do_mem_abort+0x74/0x200 arch/arm64/mm/fault.c:848 el0_da+0x60/0x168 arch/arm64/kernel/entry-common.c:546 el0t_64_sync_handler+0xcc/0xfc arch/arm64/kernel/entry-common.c:699 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 other info that might help us debug this: Chain exists of: &sbi->lock --> &vma->vm_lock->lock --> sb_pagefaults#2 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(sb_pagefaults#2); lock(&vma->vm_lock->lock); lock(sb_pagefaults#2); lock(&sbi->lock); *** DEADLOCK *** 2 locks held by syz-executor.1/10296: #0: ffff0000d49e4e08 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read include/linux/mm.h:663 [inline] #0: ffff0000d49e4e08 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x284/0x62c mm/memory.c:5606 #1: ffff0000faef4518 (sb_pagefaults#2){.+.+}-{0:0}, at: do_page_mkwrite+0x140/0x2dc mm/memory.c:2966 stack backtrace: CPU: 1 PID: 10296 Comm: syz-executor.1 Not tainted 6.8.0-rc2-syzkaller-g41bccc98fb79 #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:608 __mutex_lock kernel/locking/mutex.c:752 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804 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:1905 [inline] inode_update_time fs/inode.c:1918 [inline] __file_update_time fs/inode.c:2106 [inline] file_update_time+0x184/0x1ac fs/inode.c:2136 filemap_page_mkwrite+0x2f8/0x920 mm/filemap.c:3590 do_page_mkwrite+0x140/0x2dc mm/memory.c:2966 wp_page_shared mm/memory.c:3353 [inline] do_wp_page+0x176c/0x323c mm/memory.c:3493 handle_pte_fault mm/memory.c:5160 [inline] __handle_mm_fault mm/memory.c:5285 [inline] handle_mm_fault+0x1124/0x57dc mm/memory.c:5450 do_page_fault+0x32c/0xa64 arch/arm64/mm/fault.c:601 do_mem_abort+0x74/0x200 arch/arm64/mm/fault.c:848 el0_da+0x60/0x168 arch/arm64/kernel/entry-common.c:546 el0t_64_sync_handler+0xcc/0xfc arch/arm64/kernel/entry-common.c:699 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598