loop1: detected capacity change from 0 to 32768 ocfs2: Mounting device (7,1) on (node local, slot 0) with ordered data mode. ====================================================== WARNING: possible circular locking dependency detected 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 Not tainted ------------------------------------------------------ syz.1.167/7546 is trying to acquire lock: ffff0000de476790 (&mm->mmap_lock){++++}-{4:4}, at: __might_fault+0x9c/0x124 mm/memory.c:6957 but task is already holding lock: ffff0000f7b78660 (&oi->ip_alloc_sem){++++}-{4:4}, at: ocfs2_fiemap+0x26c/0x9c4 fs/ocfs2/extent_map.c:765 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&oi->ip_alloc_sem){++++}-{4:4}: down_write+0x50/0xc0 kernel/locking/rwsem.c:1590 ocfs2_page_mkwrite+0x340/0xbf4 fs/ocfs2/mmap.c:142 do_page_mkwrite+0x138/0x2b8 mm/memory.c:3361 wp_page_shared mm/memory.c:3762 [inline] do_wp_page+0x1d34/0x4160 mm/memory.c:3981 handle_pte_fault mm/memory.c:6068 [inline] __handle_mm_fault mm/memory.c:6195 [inline] handle_mm_fault+0x10b8/0x4d34 mm/memory.c:6364 do_page_fault+0x57c/0x13cc arch/arm64/mm/fault.c:696 do_mem_abort+0x70/0x194 arch/arm64/mm/fault.c:929 el0_da+0x64/0x164 arch/arm64/kernel/entry-common.c:697 el0t_64_sync_handler+0x90/0x12c arch/arm64/kernel/entry-common.c:901 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 -> #1 (sb_pagefaults#3){.+.+}-{0:0}: percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline] percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline] __sb_start_write include/linux/fs.h:1798 [inline] sb_start_pagefault include/linux/fs.h:1963 [inline] ocfs2_page_mkwrite+0x1b0/0xbf4 fs/ocfs2/mmap.c:122 do_page_mkwrite+0x138/0x2b8 mm/memory.c:3361 wp_page_shared mm/memory.c:3762 [inline] do_wp_page+0x1d34/0x4160 mm/memory.c:3981 handle_pte_fault mm/memory.c:6068 [inline] __handle_mm_fault mm/memory.c:6195 [inline] handle_mm_fault+0x10b8/0x4d34 mm/memory.c:6364 do_page_fault+0x57c/0x13cc arch/arm64/mm/fault.c:696 do_mem_abort+0x70/0x194 arch/arm64/mm/fault.c:929 el0_da+0x64/0x164 arch/arm64/kernel/entry-common.c:697 el0t_64_sync_handler+0x90/0x12c arch/arm64/kernel/entry-common.c:901 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 -> #0 (&mm->mmap_lock){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x1774/0x30a4 kernel/locking/lockdep.c:5237 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868 __might_fault+0xc4/0x124 mm/memory.c:6958 _inline_copy_to_user include/linux/uaccess.h:192 [inline] copy_to_user include/linux/uaccess.h:223 [inline] fiemap_fill_next_extent+0x17c/0x3f0 fs/ioctl.c:145 ocfs2_fiemap+0x648/0x9c4 fs/ocfs2/extent_map.c:806 ioctl_fiemap fs/ioctl.c:220 [inline] do_vfs_ioctl+0x1140/0x1834 fs/ioctl.c:532 __do_sys_ioctl fs/ioctl.c:596 [inline] __se_sys_ioctl fs/ioctl.c:584 [inline] __arm64_sys_ioctl+0xe4/0x1c4 fs/ioctl.c:584 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 other info that might help us debug this: Chain exists of: &mm->mmap_lock --> sb_pagefaults#3 --> &oi->ip_alloc_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(&oi->ip_alloc_sem); lock(sb_pagefaults#3); lock(&oi->ip_alloc_sem); rlock(&mm->mmap_lock); *** DEADLOCK *** 1 lock held by syz.1.167/7546: #0: ffff0000f7b78660 (&oi->ip_alloc_sem){++++}-{4:4}, at: ocfs2_fiemap+0x26c/0x9c4 fs/ocfs2/extent_map.c:765 stack backtrace: CPU: 1 UID: 0 PID: 7546 Comm: syz.1.167 Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/18/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 print_circular_bug+0x324/0x32c kernel/locking/lockdep.c:2043 check_noncircular+0x154/0x174 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x1774/0x30a4 kernel/locking/lockdep.c:5237 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868 __might_fault+0xc4/0x124 mm/memory.c:6958 _inline_copy_to_user include/linux/uaccess.h:192 [inline] copy_to_user include/linux/uaccess.h:223 [inline] fiemap_fill_next_extent+0x17c/0x3f0 fs/ioctl.c:145 ocfs2_fiemap+0x648/0x9c4 fs/ocfs2/extent_map.c:806 ioctl_fiemap fs/ioctl.c:220 [inline] do_vfs_ioctl+0x1140/0x1834 fs/ioctl.c:532 __do_sys_ioctl fs/ioctl.c:596 [inline] __se_sys_ioctl fs/ioctl.c:584 [inline] __arm64_sys_ioctl+0xe4/0x1c4 fs/ioctl.c:584 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596