====================================================== WARNING: possible circular locking dependency detected 6.16.0-rc4-next-20250702-syzkaller #0 Not tainted ------------------------------------------------------ syz.3.5606/22352 is trying to acquire lock: ffff8880321d6b98 ( &sbi->s_writepages_rwsem){++++}-{0:0}, at: percpu_down_read include/linux/percpu-rwsem.h:77 [inline] &sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1804 [inline] &sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1cc/0x350 fs/ext4/inode.c:2952 but task is already holding lock: ffff888042fa8f10 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_invalidate_lock include/linux/fs.h:924 [inline] ffff888042fa8f10 (mapping.invalidate_lock#2){++++}-{4:4}, at: swap_inode_boot_loader+0x384/0x1080 fs/ext4/ioctl.c:408 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (mapping.invalidate_lock#2){++++}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 down_read+0x46/0x2e0 kernel/locking/rwsem.c:1524 filemap_invalidate_lock_shared include/linux/fs.h:934 [inline] page_cache_ra_unbounded+0x129/0x7b0 mm/readahead.c:228 do_async_mmap_readahead mm/filemap.c:3332 [inline] filemap_fault+0x5a0/0x1200 mm/filemap.c:3431 __do_fault+0x138/0x390 mm/memory.c:5165 do_read_fault mm/memory.c:5586 [inline] do_fault mm/memory.c:5720 [inline] do_pte_missing mm/memory.c:4247 [inline] handle_pte_fault mm/memory.c:6065 [inline] __handle_mm_fault+0x3611/0x5440 mm/memory.c:6208 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6377 faultin_page mm/gup.c:1144 [inline] __get_user_pages+0x1699/0x2ce0 mm/gup.c:1446 __get_user_pages_locked mm/gup.c:1712 [inline] get_dump_page+0x1ac/0x3f0 mm/gup.c:2212 dump_user_range+0x1de/0xc90 fs/coredump.c:1363 elf_core_dump+0x32ed/0x3900 fs/binfmt_elf.c:2075 coredump_write+0x1169/0x1900 fs/coredump.c:1048 vfs_coredump+0x1a4b/0x2ab0 fs/coredump.c:1167 get_signal+0x1109/0x1340 kernel/signal.c:3019 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:40 [inline] exit_to_user_mode_prepare include/linux/irq-entry-common.h:208 [inline] irqentry_exit_to_user_mode+0x81/0x120 kernel/entry/common.c:73 exc_page_fault+0x9f/0xf0 arch/x86/mm/fault.c:1535 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 -> #3 (&mm->mmap_lock){++++}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 __might_fault+0xcc/0x130 mm/memory.c:6967 _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+0x1c0/0x390 fs/ioctl.c:145 ocfs2_fiemap+0x888/0xc90 fs/ocfs2/extent_map.c:806 ioctl_fiemap fs/ioctl.c:220 [inline] do_vfs_ioctl+0x1173/0x1430 fs/ioctl.c:532 __do_sys_ioctl fs/ioctl.c:596 [inline] __se_sys_ioctl+0x82/0x170 fs/ioctl.c:584 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #2 (&ocfs2_quota_ip_alloc_sem_key){++++}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577 ocfs2_create_local_dquot+0x19d/0x1a40 fs/ocfs2/quota_local.c:1227 ocfs2_acquire_dquot+0x80f/0xb30 fs/ocfs2/quota_global.c:883 dqget+0x7b1/0xf10 fs/quota/dquot.c:977 dquot_set_dqblk+0x2b/0xfa0 fs/quota/dquot.c:2820 quota_setquota+0x4b4/0x540 fs/quota/quota.c:310 __do_sys_quotactl fs/quota/quota.c:961 [inline] __se_sys_quotactl+0x279/0x950 fs/quota/quota.c:917 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&dquot->dq_lock){+.+.}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 __mutex_lock_common kernel/locking/mutex.c:602 [inline] __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:747 wait_on_dquot fs/quota/dquot.c:354 [inline] dqget+0x72a/0xf10 fs/quota/dquot.c:972 __dquot_initialize+0x3b3/0xcb0 fs/quota/dquot.c:1505 __ext4_new_inode+0x7db/0x3c50 fs/ext4/ialloc.c:994 ext4_ext_migrate+0x69f/0x1010 fs/ext4/migrate.c:456 ext4_ioctl_setflags fs/ext4/ioctl.c:702 [inline] ext4_fileattr_set+0xeaf/0x1630 fs/ext4/ioctl.c:1021 vfs_fileattr_set+0x932/0xb90 fs/file_attr.c:298 ioctl_setflags+0x17b/0x200 fs/file_attr.c:336 do_vfs_ioctl+0x8ed/0x1430 fs/ioctl.c:561 __do_sys_ioctl fs/ioctl.c:596 [inline] __se_sys_ioctl+0x82/0x170 fs/ioctl.c:584 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&sbi->s_writepages_rwsem){++++}-{0:0}: check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3911 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5240 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 percpu_down_read_internal+0x48/0x1c0 include/linux/percpu-rwsem.h:53 percpu_down_read include/linux/percpu-rwsem.h:77 [inline] ext4_writepages_down_read fs/ext4/ext4.h:1804 [inline] ext4_writepages+0x1cc/0x350 fs/ext4/inode.c:2952 do_writepages+0x32e/0x550 mm/page-writeback.c:2636 filemap_fdatawrite_wbc mm/filemap.c:386 [inline] __filemap_fdatawrite_range mm/filemap.c:419 [inline] filemap_write_and_wait_range+0x21f/0x320 mm/filemap.c:691 filemap_write_and_wait include/linux/pagemap.h:68 [inline] swap_inode_boot_loader+0x3b1/0x1080 fs/ext4/ioctl.c:409 __ext4_ioctl fs/ext4/ioctl.c:1430 [inline] ext4_ioctl+0x1b47/0x3510 fs/ext4/ioctl.c:1626 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:584 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 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#2 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(mapping.invalidate_lock#2); lock(&mm->mmap_lock); lock(mapping.invalidate_lock#2); rlock(&sbi->s_writepages_rwsem); *** DEADLOCK *** 4 locks held by syz.3.5606/22352: #0: ffff8880321d4428 (sb_writers#4){++++}-{0:0}, at: mnt_want_write_file+0x60/0x200 fs/namespace.c:601 #1: ffff888042fa8d70 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #1: ffff888042fa8d70 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: lock_two_nondirectories+0xe7/0x180 fs/inode.c:1232 #2: ffff888042fa9700 (&sb->s_type->i_mutex_key#9/4){+.+.}-{4:4}, at: swap_inode_boot_loader+0x70/0x1080 fs/ext4/ioctl.c:391 #3: ffff888042fa8f10 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_invalidate_lock include/linux/fs.h:924 [inline] #3: ffff888042fa8f10 (mapping.invalidate_lock#2){++++}-{4:4}, at: swap_inode_boot_loader+0x384/0x1080 fs/ext4/ioctl.c:408 stack backtrace: CPU: 0 UID: 0 PID: 22352 Comm: syz.3.5606 Not tainted 6.16.0-rc4-next-20250702-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2046 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3911 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5240 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 percpu_down_read_internal+0x48/0x1c0 include/linux/percpu-rwsem.h:53 percpu_down_read include/linux/percpu-rwsem.h:77 [inline] ext4_writepages_down_read fs/ext4/ext4.h:1804 [inline] ext4_writepages+0x1cc/0x350 fs/ext4/inode.c:2952 do_writepages+0x32e/0x550 mm/page-writeback.c:2636 filemap_fdatawrite_wbc mm/filemap.c:386 [inline] __filemap_fdatawrite_range mm/filemap.c:419 [inline] filemap_write_and_wait_range+0x21f/0x320 mm/filemap.c:691 filemap_write_and_wait include/linux/pagemap.h:68 [inline] swap_inode_boot_loader+0x3b1/0x1080 fs/ext4/ioctl.c:409 __ext4_ioctl fs/ext4/ioctl.c:1430 [inline] ext4_ioctl+0x1b47/0x3510 fs/ext4/ioctl.c:1626 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:584 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc9cf58e929 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:00007fc9d0470038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fc9cf7b6080 RCX: 00007fc9cf58e929 RDX: 0000000000000000 RSI: 0000000000006611 RDI: 0000000000000004 RBP: 00007fc9cf610b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007fc9cf7b6080 R15: 00007ffcf7a79328 EXT4-fs (loop3): Delayed block allocation failed for inode 15 at logical offset 0 with max blocks 1 with error 28