====================================================== WARNING: possible circular locking dependency detected 5.15.176-syzkaller #0 Not tainted ------------------------------------------------------ syz.0.550/5976 is trying to acquire lock: ffff0000d3782f18 (&mm->mmap_lock){++++}-{3:3}, at: __might_fault+0xa0/0x128 mm/memory.c:5354 but task is already holding lock: ffff0000ef0e3f60 (&oi->ip_alloc_sem){++++}-{3:3}, at: ocfs2_fiemap+0x2a8/0xc78 fs/ocfs2/extent_map.c:755 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&oi->ip_alloc_sem){++++}-{3:3}: down_write+0xbc/0x12c kernel/locking/rwsem.c:1551 ocfs2_page_mkwrite+0x400/0xf0c fs/ocfs2/mmap.c:142 do_page_mkwrite+0x144/0x37c mm/memory.c:2920 do_shared_fault mm/memory.c:4326 [inline] do_fault mm/memory.c:4394 [inline] handle_pte_fault mm/memory.c:4648 [inline] __handle_mm_fault mm/memory.c:4783 [inline] handle_mm_fault+0x1a10/0x33a8 mm/memory.c:4881 __do_page_fault arch/arm64/mm/fault.c:505 [inline] do_page_fault+0x700/0xb60 arch/arm64/mm/fault.c:605 do_translation_fault+0xe8/0x138 arch/arm64/mm/fault.c:686 do_mem_abort+0x70/0x1d8 arch/arm64/mm/fault.c:819 el0_da+0x94/0x20c arch/arm64/kernel/entry-common.c:494 el0t_64_sync_handler+0xc0/0xe4 arch/arm64/kernel/entry-common.c:629 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 -> #1 (sb_pagefaults#4){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1813 [inline] sb_start_pagefault include/linux/fs.h:1912 [inline] ocfs2_page_mkwrite+0x250/0xf0c fs/ocfs2/mmap.c:122 do_page_mkwrite+0x144/0x37c mm/memory.c:2920 do_shared_fault mm/memory.c:4326 [inline] do_fault mm/memory.c:4394 [inline] handle_pte_fault mm/memory.c:4648 [inline] __handle_mm_fault mm/memory.c:4783 [inline] handle_mm_fault+0x1a10/0x33a8 mm/memory.c:4881 __do_page_fault arch/arm64/mm/fault.c:505 [inline] do_page_fault+0x700/0xb60 arch/arm64/mm/fault.c:605 do_translation_fault+0xe8/0x138 arch/arm64/mm/fault.c:686 do_mem_abort+0x70/0x1d8 arch/arm64/mm/fault.c:819 el0_da+0x94/0x20c arch/arm64/kernel/entry-common.c:494 el0t_64_sync_handler+0xc0/0xe4 arch/arm64/kernel/entry-common.c:629 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 -> #0 (&mm->mmap_lock){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x32d4/0x7638 kernel/locking/lockdep.c:5012 lock_acquire+0x240/0x77c kernel/locking/lockdep.c:5623 __might_fault+0xc8/0x128 mm/memory.c:5355 _copy_to_user include/linux/uaccess.h:174 [inline] copy_to_user include/linux/uaccess.h:200 [inline] fiemap_fill_next_extent+0x1b4/0x44c fs/ioctl.c:144 ocfs2_fiemap+0x7b8/0xc78 fs/ocfs2/extent_map.c:796 ioctl_fiemap fs/ioctl.c:219 [inline] do_vfs_ioctl+0x1bcc/0x2a38 fs/ioctl.c:814 __do_sys_ioctl fs/ioctl.c:872 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __arm64_sys_ioctl+0xe4/0x1c8 fs/ioctl.c:860 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 other info that might help us debug this: Chain exists of: &mm->mmap_lock --> sb_pagefaults#4 --> &oi->ip_alloc_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&oi->ip_alloc_sem); lock(sb_pagefaults#4); lock(&oi->ip_alloc_sem); lock(&mm->mmap_lock); *** DEADLOCK *** 1 lock held by syz.0.550/5976: #0: ffff0000ef0e3f60 (&oi->ip_alloc_sem){++++}-{3:3}, at: ocfs2_fiemap+0x2a8/0xc78 fs/ocfs2/extent_map.c:755 stack backtrace: CPU: 1 PID: 5976 Comm: syz.0.550 Not tainted 5.15.176-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call trace: dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 dump_stack+0x1c/0x58 lib/dump_stack.c:113 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2011 check_noncircular+0x2cc/0x378 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x32d4/0x7638 kernel/locking/lockdep.c:5012 lock_acquire+0x240/0x77c kernel/locking/lockdep.c:5623 __might_fault+0xc8/0x128 mm/memory.c:5355 _copy_to_user include/linux/uaccess.h:174 [inline] copy_to_user include/linux/uaccess.h:200 [inline] fiemap_fill_next_extent+0x1b4/0x44c fs/ioctl.c:144 ocfs2_fiemap+0x7b8/0xc78 fs/ocfs2/extent_map.c:796 ioctl_fiemap fs/ioctl.c:219 [inline] do_vfs_ioctl+0x1bcc/0x2a38 fs/ioctl.c:814 __do_sys_ioctl fs/ioctl.c:872 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __arm64_sys_ioctl+0xe4/0x1c8 fs/ioctl.c:860 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 ocfs2: Unmounting device (7,0) on (node local)