ocfs2: Mounting device (7,6) on (node local, slot 0) with writeback data mode. ====================================================== WARNING: possible circular locking dependency detected 6.6.96-syzkaller #0 Not tainted ------------------------------------------------------ syz.6.1684/13983 is trying to acquire lock: ffff8880771edbe0 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_page_mkwrite+0x2d0/0xd10 fs/ocfs2/mmap.c:142 but task is already holding lock: ffff88804f506510 (sb_pagefaults#6){.+.+}-{0:0}, at: do_page_mkwrite+0x153/0x3e0 mm/memory.c:2950 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (sb_pagefaults#6){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1633 [inline] sb_start_pagefault include/linux/fs.h:1737 [inline] ocfs2_page_mkwrite+0x18b/0xd10 fs/ocfs2/mmap.c:122 do_page_mkwrite+0x153/0x3e0 mm/memory.c:2950 do_shared_fault mm/memory.c:4695 [inline] do_fault mm/memory.c:4757 [inline] do_pte_missing mm/memory.c:3688 [inline] handle_pte_fault mm/memory.c:5025 [inline] __handle_mm_fault mm/memory.c:5166 [inline] handle_mm_fault+0x19b8/0x4920 mm/memory.c:5331 faultin_page mm/gup.c:868 [inline] __get_user_pages+0x5ea/0x1470 mm/gup.c:1167 __get_user_pages_locked mm/gup.c:1495 [inline] __gup_longterm_locked+0x22bb/0x2920 mm/gup.c:2113 internal_get_user_pages_fast+0x217f/0x2730 mm/gup.c:3213 iov_iter_extract_user_pages lib/iov_iter.c:1785 [inline] iov_iter_extract_pages+0x393/0x790 lib/iov_iter.c:1848 dio_refill_pages fs/direct-io.c:173 [inline] dio_get_page fs/direct-io.c:214 [inline] do_direct_IO fs/direct-io.c:914 [inline] __blockdev_direct_IO+0x10d6/0x3420 fs/direct-io.c:1248 ocfs2_direct_IO+0x240/0x2b0 fs/ocfs2/aops.c:2468 generic_file_read_iter+0x317/0x4f0 mm/filemap.c:2855 ocfs2_file_read_iter+0x476/0xa30 fs/ocfs2/file.c:2588 call_read_iter include/linux/fs.h:2012 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x431/0x920 fs/read_write.c:470 ksys_read+0x147/0x250 fs/read_write.c:613 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #1 (&mm->mmap_lock){++++}-{3:3}: __might_fault+0xc6/0x120 mm/memory.c:5946 _copy_to_user+0x2a/0xa0 lib/usercopy.c:36 copy_to_user include/linux/uaccess.h:191 [inline] fiemap_fill_next_extent+0x1c1/0x390 fs/ioctl.c:145 ocfs2_fiemap+0x882/0xc80 fs/ocfs2/extent_map.c:796 ioctl_fiemap fs/ioctl.c:220 [inline] do_vfs_ioctl+0x140c/0x1bb0 fs/ioctl.c:811 __do_sys_ioctl fs/ioctl.c:869 [inline] __se_sys_ioctl+0x83/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&ocfs2_file_ip_alloc_sem_key){++++}-{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+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 down_write+0x97/0x1f0 kernel/locking/rwsem.c:1573 ocfs2_page_mkwrite+0x2d0/0xd10 fs/ocfs2/mmap.c:142 do_page_mkwrite+0x153/0x3e0 mm/memory.c:2950 do_shared_fault mm/memory.c:4695 [inline] do_fault mm/memory.c:4757 [inline] do_pte_missing mm/memory.c:3688 [inline] handle_pte_fault mm/memory.c:5025 [inline] __handle_mm_fault mm/memory.c:5166 [inline] handle_mm_fault+0x19b8/0x4920 mm/memory.c:5331 faultin_page mm/gup.c:868 [inline] __get_user_pages+0x5ea/0x1470 mm/gup.c:1167 __get_user_pages_locked mm/gup.c:1495 [inline] __gup_longterm_locked+0x22bb/0x2920 mm/gup.c:2113 internal_get_user_pages_fast+0x217f/0x2730 mm/gup.c:3213 iov_iter_extract_user_pages lib/iov_iter.c:1785 [inline] iov_iter_extract_pages+0x393/0x790 lib/iov_iter.c:1848 dio_refill_pages fs/direct-io.c:173 [inline] dio_get_page fs/direct-io.c:214 [inline] do_direct_IO fs/direct-io.c:914 [inline] __blockdev_direct_IO+0x10d6/0x3420 fs/direct-io.c:1248 ocfs2_direct_IO+0x240/0x2b0 fs/ocfs2/aops.c:2468 generic_file_read_iter+0x317/0x4f0 mm/filemap.c:2855 ocfs2_file_read_iter+0x476/0xa30 fs/ocfs2/file.c:2588 call_read_iter include/linux/fs.h:2012 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x431/0x920 fs/read_write.c:470 ksys_read+0x147/0x250 fs/read_write.c:613 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 other info that might help us debug this: Chain exists of: &ocfs2_file_ip_alloc_sem_key --> &mm->mmap_lock --> sb_pagefaults#6 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(sb_pagefaults#6); lock(&mm->mmap_lock); lock(sb_pagefaults#6); lock(&ocfs2_file_ip_alloc_sem_key); *** DEADLOCK *** 3 locks held by syz.6.1684/13983: #0: ffff88807ab294c8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2a3/0x330 fs/file.c:1042 #1: ffff888077f81e20 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock_killable include/linux/mmap_lock.h:155 [inline] #1: ffff888077f81e20 (&mm->mmap_lock){++++}-{3:3}, at: __get_user_pages_locked mm/gup.c:1486 [inline] #1: ffff888077f81e20 (&mm->mmap_lock){++++}-{3:3}, at: __gup_longterm_locked+0x225d/0x2920 mm/gup.c:2113 #2: ffff88804f506510 (sb_pagefaults#6){.+.+}-{0:0}, at: do_page_mkwrite+0x153/0x3e0 mm/memory.c:2950 stack backtrace: CPU: 1 PID: 13983 Comm: syz.6.1684 Not tainted 6.6.96-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 check_noncircular+0x2bd/0x3c0 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+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 down_write+0x97/0x1f0 kernel/locking/rwsem.c:1573 ocfs2_page_mkwrite+0x2d0/0xd10 fs/ocfs2/mmap.c:142 do_page_mkwrite+0x153/0x3e0 mm/memory.c:2950 do_shared_fault mm/memory.c:4695 [inline] do_fault mm/memory.c:4757 [inline] do_pte_missing mm/memory.c:3688 [inline] handle_pte_fault mm/memory.c:5025 [inline] __handle_mm_fault mm/memory.c:5166 [inline] handle_mm_fault+0x19b8/0x4920 mm/memory.c:5331 faultin_page mm/gup.c:868 [inline] __get_user_pages+0x5ea/0x1470 mm/gup.c:1167 __get_user_pages_locked mm/gup.c:1495 [inline] __gup_longterm_locked+0x22bb/0x2920 mm/gup.c:2113 internal_get_user_pages_fast+0x217f/0x2730 mm/gup.c:3213 iov_iter_extract_user_pages lib/iov_iter.c:1785 [inline] iov_iter_extract_pages+0x393/0x790 lib/iov_iter.c:1848 dio_refill_pages fs/direct-io.c:173 [inline] dio_get_page fs/direct-io.c:214 [inline] do_direct_IO fs/direct-io.c:914 [inline] __blockdev_direct_IO+0x10d6/0x3420 fs/direct-io.c:1248 ocfs2_direct_IO+0x240/0x2b0 fs/ocfs2/aops.c:2468 generic_file_read_iter+0x317/0x4f0 mm/filemap.c:2855 ocfs2_file_read_iter+0x476/0xa30 fs/ocfs2/file.c:2588 call_read_iter include/linux/fs.h:2012 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x431/0x920 fs/read_write.c:470 ksys_read+0x147/0x250 fs/read_write.c:613 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fa489f8e929 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa48ad20038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007fa48a1b5fa0 RCX: 00007fa489f8e929 RDX: 0000000000001000 RSI: 0000200000001400 RDI: 0000000000000004 RBP: 00007fa48a010b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fa48a1b5fa0 R15: 00007ffdbbbe37f8 (syz.6.1684,13983,0):ocfs2_dio_end_io:2428 ERROR: Direct IO failed, bytes = -4