syzbot

======================================================
WARNING: possible circular locking dependency detected
6.1.118-syzkaller #0 Not tainted
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syz.4.369/6162 is trying to acquire lock:
ffff0000f23d0660 (&oi->ip_alloc_sem){++++}-{3:3}, at: ocfs2_page_mkwrite+0x388/0xdd4 fs/ocfs2/mmap.c:142

but task is already holding lock:
ffff0000db94c558 (sb_pagefaults#4){.+.+}-{0:0}, at: do_page_mkwrite+0x144/0x37c mm/memory.c:3009

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (sb_pagefaults#4){.+.+}-{0:0}:
       percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
       __sb_start_write include/linux/fs.h:1891 [inline]
       sb_start_pagefault include/linux/fs.h:1995 [inline]
       ocfs2_page_mkwrite+0x1d4/0xdd4 fs/ocfs2/mmap.c:122
       do_page_mkwrite+0x144/0x37c mm/memory.c:3009
       do_shared_fault mm/memory.c:4694 [inline]
       do_fault mm/memory.c:4762 [inline]
       handle_pte_fault mm/memory.c:5029 [inline]
       __handle_mm_fault mm/memory.c:5171 [inline]
       handle_mm_fault+0x1824/0x3d38 mm/memory.c:5292
       faultin_page mm/gup.c:1009 [inline]
       __get_user_pages+0x3b0/0x968 mm/gup.c:1233
       faultin_vma_page_range+0x1d8/0x274 mm/gup.c:1653
       madvise_populate mm/madvise.c:919 [inline]
       madvise_vma_behavior mm/madvise.c:1028 [inline]
       madvise_walk_vmas mm/madvise.c:1250 [inline]
       do_madvise+0x1204/0x2fa8 mm/madvise.c:1429
       __do_sys_madvise mm/madvise.c:1442 [inline]
       __se_sys_madvise mm/madvise.c:1440 [inline]
       __arm64_sys_madvise+0xa4/0xc0 mm/madvise.c:1440
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
       do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
       el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
       el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
       el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

-> #1 (&mm->mmap_lock){++++}-{3:3}:
       __might_fault+0xc4/0x124 mm/memory.c:5851
       _copy_to_user include/linux/uaccess.h:143 [inline]
       copy_to_user include/linux/uaccess.h:169 [inline]
       fiemap_fill_next_extent+0x1b4/0x424 fs/ioctl.c:144
       ocfs2_fiemap+0x7b8/0xc78 fs/ocfs2/extent_map.c:796
       ioctl_fiemap fs/ioctl.c:219 [inline]
       do_vfs_ioctl+0x194c/0x26f8 fs/ioctl.c:810
       __do_sys_ioctl fs/ioctl.c:868 [inline]
       __se_sys_ioctl fs/ioctl.c:856 [inline]
       __arm64_sys_ioctl+0xe4/0x1c8 fs/ioctl.c:856
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
       do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
       el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
       el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
       el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

-> #0 (&oi->ip_alloc_sem){++++}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3090 [inline]
       check_prevs_add kernel/locking/lockdep.c:3209 [inline]
       validate_chain kernel/locking/lockdep.c:3825 [inline]
       __lock_acquire+0x3338/0x7680 kernel/locking/lockdep.c:5049
       lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662
       down_write+0x5c/0x88 kernel/locking/rwsem.c:1573
       ocfs2_page_mkwrite+0x388/0xdd4 fs/ocfs2/mmap.c:142
       do_page_mkwrite+0x144/0x37c mm/memory.c:3009
       do_shared_fault mm/memory.c:4694 [inline]
       do_fault mm/memory.c:4762 [inline]
       handle_pte_fault mm/memory.c:5029 [inline]
       __handle_mm_fault mm/memory.c:5171 [inline]
       handle_mm_fault+0x1824/0x3d38 mm/memory.c:5292
       faultin_page mm/gup.c:1009 [inline]
       __get_user_pages+0x3b0/0x968 mm/gup.c:1233
       faultin_vma_page_range+0x1d8/0x274 mm/gup.c:1653
       madvise_populate mm/madvise.c:919 [inline]
       madvise_vma_behavior mm/madvise.c:1028 [inline]
       madvise_walk_vmas mm/madvise.c:1250 [inline]
       do_madvise+0x1204/0x2fa8 mm/madvise.c:1429
       __do_sys_madvise mm/madvise.c:1442 [inline]
       __se_sys_madvise mm/madvise.c:1440 [inline]
       __arm64_sys_madvise+0xa4/0xc0 mm/madvise.c:1440
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
       do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
       el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
       el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
       el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

other info that might help us debug this:

Chain exists of:
  &oi->ip_alloc_sem --> &mm->mmap_lock --> sb_pagefaults#4

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(sb_pagefaults#4);
                               lock(&mm->mmap_lock);
                               lock(sb_pagefaults#4);
  lock(&oi->ip_alloc_sem);

 *** DEADLOCK ***

2 locks held by syz.4.369/6162:
 #0: ffff0000c4a21948 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock+0x28/0x74 include/linux/mmap_lock.h:117
 #1: ffff0000db94c558 (sb_pagefaults#4){.+.+}-{0:0}, at: do_page_mkwrite+0x144/0x37c mm/memory.c:3009

stack backtrace:
CPU: 1 PID: 6162 Comm: syz.4.369 Not tainted 6.1.118-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2048
 check_noncircular+0x2cc/0x378 kernel/locking/lockdep.c:2170
 check_prev_add kernel/locking/lockdep.c:3090 [inline]
 check_prevs_add kernel/locking/lockdep.c:3209 [inline]
 validate_chain kernel/locking/lockdep.c:3825 [inline]
 __lock_acquire+0x3338/0x7680 kernel/locking/lockdep.c:5049
 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662
 down_write+0x5c/0x88 kernel/locking/rwsem.c:1573
 ocfs2_page_mkwrite+0x388/0xdd4 fs/ocfs2/mmap.c:142
 do_page_mkwrite+0x144/0x37c mm/memory.c:3009
 do_shared_fault mm/memory.c:4694 [inline]
 do_fault mm/memory.c:4762 [inline]
 handle_pte_fault mm/memory.c:5029 [inline]
 __handle_mm_fault mm/memory.c:5171 [inline]
 handle_mm_fault+0x1824/0x3d38 mm/memory.c:5292
 faultin_page mm/gup.c:1009 [inline]
 __get_user_pages+0x3b0/0x968 mm/gup.c:1233
 faultin_vma_page_range+0x1d8/0x274 mm/gup.c:1653
 madvise_populate mm/madvise.c:919 [inline]
 madvise_vma_behavior mm/madvise.c:1028 [inline]
 madvise_walk_vmas mm/madvise.c:1250 [inline]
 do_madvise+0x1204/0x2fa8 mm/madvise.c:1429
 __do_sys_madvise mm/madvise.c:1442 [inline]
 __se_sys_madvise mm/madvise.c:1440 [inline]
 __arm64_sys_madvise+0xa4/0xc0 mm/madvise.c:1440
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585