EXT4-fs (loop6): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none. ====================================================== WARNING: possible circular locking dependency detected 6.14.0-rc6-syzkaller-00263-gd1275e99d1c4 #0 Not tainted ------------------------------------------------------ syz.6.1434/17731 is trying to acquire lock: ffff88806b2f2b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1773 [inline] ffff88806b2f2b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bf/0x3c0 fs/ext4/inode.c:2823 but task is already holding lock: ffff8880331a4108 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock include/linux/fs.h:922 [inline] ffff8880331a4108 (mapping.invalidate_lock){++++}-{4:4}, at: ext4_insert_range fs/ext4/extents.c:5528 [inline] ffff8880331a4108 (mapping.invalidate_lock){++++}-{4:4}, at: ext4_fallocate+0xdae/0x1ea0 fs/ext4/extents.c:4782 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (mapping.invalidate_lock){++++}-{4:4}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 down_read+0xb1/0xa40 kernel/locking/rwsem.c:1524 filemap_invalidate_lock_shared include/linux/fs.h:932 [inline] page_cache_ra_unbounded+0x156/0x820 mm/readahead.c:228 do_async_mmap_readahead mm/filemap.c:3278 [inline] filemap_fault+0x818/0x1490 mm/filemap.c:3377 __do_fault+0x135/0x390 mm/memory.c:4989 do_read_fault mm/memory.c:5409 [inline] do_fault mm/memory.c:5543 [inline] do_pte_missing mm/memory.c:4059 [inline] handle_pte_fault mm/memory.c:5888 [inline] __handle_mm_fault+0x40c6/0x6ef0 mm/memory.c:6031 handle_mm_fault+0x2c1/0x7e0 mm/memory.c:6200 faultin_page mm/gup.c:1196 [inline] __get_user_pages+0x1a92/0x4140 mm/gup.c:1491 __get_user_pages_locked mm/gup.c:1757 [inline] get_dump_page+0x155/0x2f0 mm/gup.c:2275 dump_user_range+0x14d/0x970 fs/coredump.c:944 elf_core_dump+0x4054/0x4a80 fs/binfmt_elf.c:2129 do_coredump+0x22e7/0x3290 fs/coredump.c:759 get_signal+0x13e5/0x1720 kernel/signal.c:3021 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] irqentry_exit_to_user_mode+0x7e/0x250 kernel/entry/common.c:231 exc_page_fault+0x590/0x8b0 arch/x86/mm/fault.c:1541 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 -> #3 (&mm->mmap_lock){++++}-{4:4}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 __might_fault+0xc6/0x120 mm/memory.c:6839 _inline_copy_to_user include/linux/uaccess.h:192 [inline] _copy_to_user+0x2c/0xb0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:225 [inline] fiemap_fill_next_extent+0x235/0x420 fs/ioctl.c:145 ocfs2_fiemap+0xa03/0x1010 fs/ocfs2/extent_map.c:806 ioctl_fiemap fs/ioctl.c:220 [inline] do_vfs_ioctl+0x1981/0x2770 fs/ioctl.c:840 __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl+0x80/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #2 (&ocfs2_quota_ip_alloc_sem_key){++++}-{4:4}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 down_write+0x99/0x220 kernel/locking/rwsem.c:1577 ocfs2_create_local_dquot+0x1de/0x1d70 fs/ocfs2/quota_local.c:1232 ocfs2_acquire_dquot+0x833/0xb70 fs/ocfs2/quota_global.c:883 dqget+0x770/0xeb0 fs/quota/dquot.c:977 dquot_set_dqblk+0x2b/0xf30 fs/quota/dquot.c:2820 quota_setquota+0x6dc/0x850 fs/quota/quota.c:310 __do_sys_quotactl fs/quota/quota.c:961 [inline] __se_sys_quotactl+0x2c4/0xa30 fs/quota/quota.c:917 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&dquot->dq_lock){+.+.}-{4:4}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19c/0x1010 kernel/locking/mutex.c:730 wait_on_dquot fs/quota/dquot.c:354 [inline] dqget+0x6e6/0xeb0 fs/quota/dquot.c:972 __dquot_initialize+0x2e3/0xec0 fs/quota/dquot.c:1505 __ext4_new_inode+0x852/0x4630 fs/ext4/ialloc.c:992 ext4_ext_migrate+0x700/0x1440 fs/ext4/migrate.c:456 ext4_ioctl_setflags fs/ext4/ioctl.c:702 [inline] ext4_fileattr_set+0xecf/0x16e0 fs/ext4/ioctl.c:1021 vfs_fileattr_set+0x8ff/0xd50 fs/ioctl.c:696 ioctl_setflags fs/ioctl.c:728 [inline] do_vfs_ioctl+0x1816/0x2770 fs/ioctl.c:869 __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl+0x80/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&sbi->s_writepages_rwsem){++++}-{0:0}: check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 percpu_down_read+0x44/0x1b0 include/linux/percpu-rwsem.h:51 ext4_writepages_down_read fs/ext4/ext4.h:1773 [inline] ext4_writepages+0x1bf/0x3c0 fs/ext4/inode.c:2823 do_writepages+0x35f/0x880 mm/page-writeback.c:2687 filemap_fdatawrite_wbc mm/filemap.c:388 [inline] __filemap_fdatawrite_range mm/filemap.c:421 [inline] filemap_write_and_wait_range+0x283/0x3a0 mm/filemap.c:693 ext4_insert_range fs/ext4/extents.c:5540 [inline] ext4_fallocate+0xe48/0x1ea0 fs/ext4/extents.c:4782 vfs_fallocate+0x623/0x7a0 fs/open.c:338 ksys_fallocate fs/open.c:362 [inline] __do_sys_fallocate fs/open.c:367 [inline] __se_sys_fallocate fs/open.c:365 [inline] __x64_sys_fallocate+0xbc/0x110 fs/open.c:365 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: &sbi->s_writepages_rwsem --> &mm->mmap_lock --> mapping.invalidate_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(mapping.invalidate_lock); lock(&mm->mmap_lock); lock(mapping.invalidate_lock); rlock(&sbi->s_writepages_rwsem); *** DEADLOCK *** 3 locks held by syz.6.1434/17731: #0: ffff888052ed0420 (sb_writers#4){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3035 [inline] #0: ffff888052ed0420 (sb_writers#4){.+.+}-{0:0}, at: vfs_fallocate+0x59d/0x7a0 fs/open.c:337 #1: ffff8880331a3f68 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:877 [inline] #1: ffff8880331a3f68 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: ext4_insert_range fs/ext4/extents.c:5498 [inline] #1: ffff8880331a3f68 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: ext4_fallocate+0xab9/0x1ea0 fs/ext4/extents.c:4782 #2: ffff8880331a4108 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock include/linux/fs.h:922 [inline] #2: ffff8880331a4108 (mapping.invalidate_lock){++++}-{4:4}, at: ext4_insert_range fs/ext4/extents.c:5528 [inline] #2: ffff8880331a4108 (mapping.invalidate_lock){++++}-{4:4}, at: ext4_fallocate+0xdae/0x1ea0 fs/ext4/extents.c:4782 stack backtrace: CPU: 1 UID: 0 PID: 17731 Comm: syz.6.1434 Not tainted 6.14.0-rc6-syzkaller-00263-gd1275e99d1c4 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2076 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2208 check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 percpu_down_read+0x44/0x1b0 include/linux/percpu-rwsem.h:51 ext4_writepages_down_read fs/ext4/ext4.h:1773 [inline] ext4_writepages+0x1bf/0x3c0 fs/ext4/inode.c:2823 do_writepages+0x35f/0x880 mm/page-writeback.c:2687 filemap_fdatawrite_wbc mm/filemap.c:388 [inline] __filemap_fdatawrite_range mm/filemap.c:421 [inline] filemap_write_and_wait_range+0x283/0x3a0 mm/filemap.c:693 ext4_insert_range fs/ext4/extents.c:5540 [inline] ext4_fallocate+0xe48/0x1ea0 fs/ext4/extents.c:4782 vfs_fallocate+0x623/0x7a0 fs/open.c:338 ksys_fallocate fs/open.c:362 [inline] __do_sys_fallocate fs/open.c:367 [inline] __se_sys_fallocate fs/open.c:365 [inline] __x64_sys_fallocate+0xbc/0x110 fs/open.c:365 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc8af98d169 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:00007fc8b07c9038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007fc8afba5fa0 RCX: 00007fc8af98d169 RDX: 0000000000000000 RSI: 0000000000000020 RDI: 0000000000000005 RBP: 00007fc8afa0e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000008000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fc8afba5fa0 R15: 00007ffc312866b8