syzbot has found a reproducer for the following issue on: HEAD commit: a5541c0811a0 Merge branch 'for-next/core' into for-kernelci git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=176e216b880000 kernel config: https://syzkaller.appspot.com/x/.config?x=cbd4e584773e9397 dashboard link: https://syzkaller.appspot.com/bug?extid=7736960b837908f3a81d compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17289a2f880000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15215fc3880000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/4b7702208fb9/disk-a5541c08.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9ec0153ec051/vmlinux-a5541c08.xz kernel image: https://storage.googleapis.com/syzbot-assets/6f8725ad290a/Image-a5541c08.gz.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/e6f9575381c5/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+7736960b837908f3a81d@xxxxxxxxxxxxxxxxxxxxxxxxx exfat: Deprecated parameter 'utf8' exFAT-fs (loop0): failed to load upcase table (idx : 0x00010000, chksum : 0x207d53fc, utbl_chksum : 0xe619d30d) ====================================================== WARNING: possible circular locking dependency detected 6.1.0-rc8-syzkaller-33330-ga5541c0811a0 #0 Not tainted ------------------------------------------------------ syz-executor581/3072 is trying to acquire lock: ffff0000caee1060 (mapping.invalidate_lock#3){.+.+}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:811 [inline] ffff0000caee1060 (mapping.invalidate_lock#3){.+.+}-{3:3}, at: filemap_fault+0x104/0x7fc mm/filemap.c:3127 but task is already holding lock: ffff0000c02520c8 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline] ffff0000c02520c8 (&mm->mmap_lock){++++}-{3:3}, at: do_page_fault+0x1ec/0x79c arch/arm64/mm/fault.c:589 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&mm->mmap_lock){++++}-{3:3}: __might_fault+0x7c/0xb4 mm/memory.c:5645 filldir64+0x1e8/0x574 fs/readdir.c:335 dir_emit_dot include/linux/fs.h:3569 [inline] dir_emit_dots include/linux/fs.h:3580 [inline] exfat_iterate+0xd4/0xcb4 fs/exfat/dir.c:231 iterate_dir+0x114/0x28c __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64 fs/readdir.c:354 [inline] __arm64_sys_getdents64+0x80/0x204 fs/readdir.c:354 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x140 arch/arm64/kernel/syscall.c:197 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584 -> #1 (&sbi->s_lock){+.+.}-{3:3}: __mutex_lock_common+0xd4/0xca8 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 exfat_get_block+0x6c/0x9ec fs/exfat/inode.c:282 do_mpage_readpage+0x474/0xd38 fs/mpage.c:208 mpage_readahead+0xf0/0x1b8 fs/mpage.c:361 exfat_readahead+0x28/0x38 fs/exfat/inode.c:345 read_pages+0x8c/0x4f0 mm/readahead.c:161 page_cache_ra_unbounded+0x374/0x400 mm/readahead.c:270 do_page_cache_ra mm/readahead.c:300 [inline] page_cache_ra_order+0x348/0x380 mm/readahead.c:560 ondemand_readahead+0x340/0x720 mm/readahead.c:682 page_cache_sync_ra+0xc4/0xdc mm/readahead.c:709 page_cache_sync_readahead include/linux/pagemap.h:1213 [inline] filemap_get_pages+0x118/0x598 mm/filemap.c:2581 filemap_read+0x14c/0x6f4 mm/filemap.c:2675 generic_file_read_iter+0x6c/0x25c mm/filemap.c:2821 call_read_iter include/linux/fs.h:2193 [inline] aio_read+0x170/0x254 fs/aio.c:1560 __io_submit_one+0x218/0x5e4 io_submit_one+0x2c4/0x4bc fs/aio.c:2019 __do_sys_io_submit+0x16c/0x2ac fs/aio.c:2078 __se_sys_io_submit fs/aio.c:2048 [inline] __arm64_sys_io_submit+0x24/0x34 fs/aio.c:2048 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x140 arch/arm64/kernel/syscall.c:197 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584 -> #0 (mapping.invalidate_lock#3){.+.+}-{3:3}: check_prev_add kernel/locking/lockdep.c:3097 [inline] check_prevs_add kernel/locking/lockdep.c:3216 [inline] validate_chain kernel/locking/lockdep.c:3831 [inline] __lock_acquire+0x1530/0x3084 kernel/locking/lockdep.c:5055 lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5668 down_read+0x5c/0x78 kernel/locking/rwsem.c:1509 filemap_invalidate_lock_shared include/linux/fs.h:811 [inline] filemap_fault+0x104/0x7fc mm/filemap.c:3127 __do_fault+0x60/0x358 mm/memory.c:4202 do_read_fault mm/memory.c:4553 [inline] do_fault+0x338/0x550 mm/memory.c:4682 handle_pte_fault mm/memory.c:4954 [inline] __handle_mm_fault mm/memory.c:5096 [inline] handle_mm_fault+0x78c/0xa48 mm/memory.c:5217 __do_page_fault arch/arm64/mm/fault.c:508 [inline] do_page_fault+0x428/0x79c arch/arm64/mm/fault.c:608 do_translation_fault+0x78/0x194 arch/arm64/mm/fault.c:691 do_mem_abort+0x54/0x130 arch/arm64/mm/fault.c:827 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:367 el1h_64_sync_handler+0x60/0xac arch/arm64/kernel/entry-common.c:427 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:579 do_strncpy_from_user lib/strncpy_from_user.c:41 [inline] strncpy_from_user+0x1a8/0x3d8 lib/strncpy_from_user.c:139 getname_flags+0x84/0x278 fs/namei.c:150 getname+0x28/0x38 fs/namei.c:218 do_sys_openat2+0x78/0x22c fs/open.c:1304 do_sys_open fs/open.c:1326 [inline] __do_sys_openat fs/open.c:1342 [inline] __se_sys_openat fs/open.c:1337 [inline] __arm64_sys_openat+0xb0/0xe0 fs/open.c:1337 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x140 arch/arm64/kernel/syscall.c:197 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584 other info that might help us debug this: Chain exists of: mapping.invalidate_lock#3 --> &sbi->s_lock --> &mm->mmap_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&mm->mmap_lock); lock(&sbi->s_lock); lock(&mm->mmap_lock); lock(mapping.invalidate_lock#3); *** DEADLOCK *** 1 lock held by syz-executor581/3072: #0: ffff0000c02520c8 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline] #0: ffff0000c02520c8 (&mm->mmap_lock){++++}-{3:3}, at: do_page_fault+0x1ec/0x79c arch/arm64/mm/fault.c:589 stack backtrace: CPU: 0 PID: 3072 Comm: syz-executor581 Not tainted 6.1.0-rc8-syzkaller-33330-ga5541c0811a0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022 Call trace: dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:156 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:163 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x104/0x16c lib/dump_stack.c:106 dump_stack+0x1c/0x58 lib/dump_stack.c:113 print_circular_bug+0x2c4/0x2c8 kernel/locking/lockdep.c:2055 check_noncircular+0x14c/0x154 kernel/locking/lockdep.c:2177 check_prev_add kernel/locking/lockdep.c:3097 [inline] check_prevs_add kernel/locking/lockdep.c:3216 [inline] validate_chain kernel/locking/lockdep.c:3831 [inline] __lock_acquire+0x1530/0x3084 kernel/locking/lockdep.c:5055 lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5668 down_read+0x5c/0x78 kernel/locking/rwsem.c:1509 filemap_invalidate_lock_shared include/linux/fs.h:811 [inline] filemap_fault+0x104/0x7fc mm/filemap.c:3127 __do_fault+0x60/0x358 mm/memory.c:4202 do_read_fault mm/memory.c:4553 [inline] do_fault+0x338/0x550 mm/memory.c:4682 handle_pte_fault mm/memory.c:4954 [inline] __handle_mm_fault mm/memory.c:5096 [inline] handle_mm_fault+0x78c/0xa48 mm/memory.c:5217 __do_page_fault arch/arm64/mm/fault.c:508 [inline] do_page_fault+0x428/0x79c arch/arm64/mm/fault.c:608 do_translation_fault+0x78/0x194 arch/arm64/mm/fault.c:691 do_mem_abort+0x54/0x130 arch/arm64/mm/fault.c:827 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:367 el1h_64_sync_handler+0x60/0xac arch/arm64/kernel/entry-common.c:427 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:579 do_strncpy_from_user lib/strncpy_from_user.c:41 [inline] strncpy_from_user+0x1a8/0x3d8 lib/strncpy_from_user.c:139 getname_flags+0x84/0x278 fs/namei.c:150 getname+0x28/0x38 fs/namei.c:218 do_sys_openat2+0x78/0x22c fs/open.c:1304 do_sys_open fs/open.c:1326 [inline] __do_sys_openat fs/open.c:1342 [inline] __se_sys_openat fs/open.c:1337 [inline] __arm64_sys_openat+0xb0/0xe0 fs/open.c:1337 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x140 arch/arm64/kernel/syscall.c:197 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584
