====================================================== WARNING: possible circular locking dependency detected 6.1.38-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/10574 is trying to acquire lock: ffff00011e7c20e0 (&sbi->s_lock){+.+.}-{3:3}, at: exfat_get_block+0x164/0x17ec fs/exfat/inode.c:281 but task is already holding lock: ffff000122529150 (mapping.invalidate_lock#5){.+.+}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:811 [inline] ffff000122529150 (mapping.invalidate_lock#5){.+.+}-{3:3}, at: page_cache_ra_unbounded+0xc8/0x58c mm/readahead.c:226 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (mapping.invalidate_lock#5){.+.+}-{3:3}: down_read+0x64/0x308 kernel/locking/rwsem.c:1520 filemap_invalidate_lock_shared include/linux/fs.h:811 [inline] filemap_fault+0x58c/0xf7c mm/filemap.c:3128 __do_fault+0x11c/0x3d8 mm/memory.c:4224 do_read_fault mm/memory.c:4575 [inline] do_fault mm/memory.c:4704 [inline] handle_pte_fault mm/memory.c:4976 [inline] __handle_mm_fault mm/memory.c:5118 [inline] handle_mm_fault+0x1f68/0x3e9c mm/memory.c:5239 __do_page_fault arch/arm64/mm/fault.c:499 [inline] do_page_fault+0x330/0x890 arch/arm64/mm/fault.c:583 do_translation_fault+0x94/0xc8 arch/arm64/mm/fault.c:667 do_mem_abort+0x74/0x200 arch/arm64/mm/fault.c:803 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:576 do_strncpy_from_user lib/strncpy_from_user.c:41 [inline] strncpy_from_user+0x224/0x54c lib/strncpy_from_user.c:139 getname_flags+0x104/0x480 fs/namei.c:150 getname+0x28/0x38 fs/namei.c:218 do_sys_openat2+0xd4/0x3d8 fs/open.c:1312 do_sys_open fs/open.c:1334 [inline] __do_sys_openat fs/open.c:1350 [inline] __se_sys_openat fs/open.c:1345 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1345 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 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:581 -> #1 (&mm->mmap_lock){++++}-{3:3}: __might_fault+0xc4/0x124 mm/memory.c:5794 filldir64+0x2d4/0x948 fs/readdir.c:335 dir_emit_dot include/linux/fs.h:3583 [inline] dir_emit_dots include/linux/fs.h:3594 [inline] exfat_iterate+0x23c/0x2734 fs/exfat/dir.c:231 iterate_dir+0x1f4/0x4e4 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64 fs/readdir.c:354 [inline] __arm64_sys_getdents64+0x1c4/0x4a0 fs/readdir.c:354 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 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:581 -> #0 (&sbi->s_lock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain kernel/locking/lockdep.c:3832 [inline] __lock_acquire+0x3338/0x764c kernel/locking/lockdep.c:5056 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5669 __mutex_lock_common+0x190/0x21a0 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+0x164/0x17ec fs/exfat/inode.c:281 do_mpage_readpage+0x5d8/0x1748 fs/mpage.c:208 mpage_readahead+0x360/0x644 fs/mpage.c:361 exfat_readahead+0x28/0x38 fs/exfat/inode.c:344 read_pages+0x168/0x6a0 mm/readahead.c:161 page_cache_ra_unbounded+0x46c/0x58c mm/readahead.c:270 do_page_cache_ra mm/readahead.c:300 [inline] page_cache_ra_order+0x7fc/0x994 mm/readahead.c:560 ondemand_readahead+0x5f8/0xb04 mm/readahead.c:682 page_cache_sync_ra+0x350/0x3d0 mm/readahead.c:709 page_cache_sync_readahead include/linux/pagemap.h:1213 [inline] filemap_get_pages mm/filemap.c:2582 [inline] filemap_read+0x598/0x2260 mm/filemap.c:2676 generic_file_read_iter+0xa0/0x450 mm/filemap.c:2822 call_read_iter include/linux/fs.h:2199 [inline] generic_file_splice_read+0x1e0/0x508 fs/splice.c:309 do_splice_to fs/splice.c:793 [inline] splice_direct_to_actor+0x30c/0x944 fs/splice.c:865 do_splice_direct+0x1f4/0x334 fs/splice.c:974 do_sendfile+0x4bc/0xc70 fs/read_write.c:1255 __do_sys_sendfile64 fs/read_write.c:1323 [inline] __se_sys_sendfile64 fs/read_write.c:1309 [inline] __arm64_sys_sendfile64+0x160/0x3b4 fs/read_write.c:1309 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 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:581 other info that might help us debug this: Chain exists of: &sbi->s_lock --> &mm->mmap_lock --> mapping.invalidate_lock#5 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(mapping.invalidate_lock#5); lock(&mm->mmap_lock); lock(mapping.invalidate_lock#5); lock(&sbi->s_lock); *** DEADLOCK *** 2 locks held by syz-executor.3/10574: #0: ffff00011e7c0460 (sb_writers#18){.+.+}-{0:0}, at: do_sendfile+0x4a0/0xc70 fs/read_write.c:1254 #1: ffff000122529150 (mapping.invalidate_lock#5){.+.+}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:811 [inline] #1: ffff000122529150 (mapping.invalidate_lock#5){.+.+}-{3:3}, at: page_cache_ra_unbounded+0xc8/0x58c mm/readahead.c:226 stack backtrace: CPU: 0 PID: 10574 Comm: syz-executor.3 Not tainted 6.1.38-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 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:2056 check_noncircular+0x2cc/0x378 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain kernel/locking/lockdep.c:3832 [inline] __lock_acquire+0x3338/0x764c kernel/locking/lockdep.c:5056 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5669 __mutex_lock_common+0x190/0x21a0 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+0x164/0x17ec fs/exfat/inode.c:281 do_mpage_readpage+0x5d8/0x1748 fs/mpage.c:208 mpage_readahead+0x360/0x644 fs/mpage.c:361 exfat_readahead+0x28/0x38 fs/exfat/inode.c:344 read_pages+0x168/0x6a0 mm/readahead.c:161 page_cache_ra_unbounded+0x46c/0x58c mm/readahead.c:270 do_page_cache_ra mm/readahead.c:300 [inline] page_cache_ra_order+0x7fc/0x994 mm/readahead.c:560 ondemand_readahead+0x5f8/0xb04 mm/readahead.c:682 page_cache_sync_ra+0x350/0x3d0 mm/readahead.c:709 page_cache_sync_readahead include/linux/pagemap.h:1213 [inline] filemap_get_pages mm/filemap.c:2582 [inline] filemap_read+0x598/0x2260 mm/filemap.c:2676 generic_file_read_iter+0xa0/0x450 mm/filemap.c:2822 call_read_iter include/linux/fs.h:2199 [inline] generic_file_splice_read+0x1e0/0x508 fs/splice.c:309 do_splice_to fs/splice.c:793 [inline] splice_direct_to_actor+0x30c/0x944 fs/splice.c:865 do_splice_direct+0x1f4/0x334 fs/splice.c:974 do_sendfile+0x4bc/0xc70 fs/read_write.c:1255 __do_sys_sendfile64 fs/read_write.c:1323 [inline] __se_sys_sendfile64 fs/read_write.c:1309 [inline] __arm64_sys_sendfile64+0x160/0x3b4 fs/read_write.c:1309 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 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:581