Hello, syzbot found the following issue on: HEAD commit: 2f87d0916ce0 Merge tag 'trace-ringbuffer-v6.12-rc3' of git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10279f67980000 kernel config: https://syzkaller.appspot.com/x/.config?x=164d2822debd8b0d dashboard link: https://syzkaller.appspot.com/bug?extid=eb5b4ef634a018917f3c compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/f487443bc3bb/disk-2f87d091.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c5cebceae528/vmlinux-2f87d091.xz kernel image: https://storage.googleapis.com/syzbot-assets/e9c1ca67e7e7/bzImage-2f87d091.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+eb5b4ef634a018917f3c@xxxxxxxxxxxxxxxxxxxxxxxxx EXT4-fs (loop4): Free/Dirty block details EXT4-fs (loop4): free_blocks=2415919104 EXT4-fs (loop4): dirty_blocks=16 EXT4-fs (loop4): Block reservation details EXT4-fs (loop4): i_reserved_data_blocks=1 ====================================================== WARNING: possible circular locking dependency detected 6.12.0-rc3-syzkaller-00044-g2f87d0916ce0 #0 Not tainted ------------------------------------------------------ syz.4.962/11197 is trying to acquire lock: ffff8880256c6b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1772 [inline] ffff8880256c6b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bf/0x3c0 fs/ext4/inode.c:2812 but task is already holding lock: ffff888060670f80 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:860 [inline] ffff888060670f80 (mapping.invalidate_lock){++++}-{3:3}, at: swap_inode_boot_loader fs/ext4/ioctl.c:408 [inline] ffff888060670f80 (mapping.invalidate_lock){++++}-{3:3}, at: __ext4_ioctl fs/ext4/ioctl.c:1436 [inline] ffff888060670f80 (mapping.invalidate_lock){++++}-{3:3}, at: ext4_ioctl+0x3c1e/0x5590 fs/ext4/ioctl.c:1626 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (mapping.invalidate_lock){++++}-{3:3}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 down_read+0xb1/0xa40 kernel/locking/rwsem.c:1524 filemap_invalidate_lock_shared include/linux/fs.h:870 [inline] ext4_page_mkwrite+0x217/0xdf0 fs/ext4/inode.c:6104 do_page_mkwrite+0x198/0x480 mm/memory.c:3162 wp_page_shared mm/memory.c:3563 [inline] do_wp_page+0x23d3/0x52d0 mm/memory.c:3713 handle_pte_fault+0x10e3/0x6800 mm/memory.c:5767 __handle_mm_fault mm/memory.c:5894 [inline] handle_mm_fault+0x1053/0x1ad0 mm/memory.c:6062 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x459/0x8c0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 -> #4 (sb_pagefaults){++++}-{0:0}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 percpu_down_read+0x44/0x1b0 include/linux/percpu-rwsem.h:51 __sb_start_write include/linux/fs.h:1716 [inline] sb_start_pagefault include/linux/fs.h:1881 [inline] ext4_page_mkwrite+0x1ef/0xdf0 fs/ext4/inode.c:6101 do_page_mkwrite+0x198/0x480 mm/memory.c:3162 do_shared_fault mm/memory.c:5358 [inline] do_fault mm/memory.c:5420 [inline] do_pte_missing mm/memory.c:3965 [inline] handle_pte_fault+0x11fa/0x6800 mm/memory.c:5751 __handle_mm_fault mm/memory.c:5894 [inline] handle_mm_fault+0x1053/0x1ad0 mm/memory.c:6062 do_user_addr_fault arch/x86/mm/fault.c:1389 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x2b9/0x8c0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 -> #3 (&mm->mmap_lock){++++}-{3:3}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 __might_fault+0xc6/0x120 mm/memory.c:6700 _inline_copy_to_user include/linux/uaccess.h:183 [inline] _copy_to_user+0x2a/0xb0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:216 [inline] fiemap_fill_next_extent+0x235/0x410 fs/ioctl.c:145 ocfs2_fiemap+0x9f1/0xf80 fs/ocfs2/extent_map.c:796 ioctl_fiemap fs/ioctl.c:220 [inline] do_vfs_ioctl+0x1bf8/0x2e40 fs/ioctl.c:841 __do_sys_ioctl fs/ioctl.c:905 [inline] __se_sys_ioctl+0x81/0x170 fs/ioctl.c:893 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){++++}-{3:3}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 down_write+0x99/0x220 kernel/locking/rwsem.c:1577 ocfs2_create_local_dquot+0x1de/0x1d70 fs/ocfs2/quota_local.c:1231 ocfs2_acquire_dquot+0x833/0xb80 fs/ocfs2/quota_global.c:878 dqget+0x770/0xeb0 fs/quota/dquot.c:976 ocfs2_setattr+0xe70/0x1f50 fs/ocfs2/file.c:1230 notify_change+0xbca/0xe90 fs/attr.c:503 chown_common+0x501/0x850 fs/open.c:793 do_fchownat+0x16a/0x240 fs/open.c:824 __do_sys_lchown fs/open.c:849 [inline] __se_sys_lchown fs/open.c:847 [inline] __x64_sys_lchown+0x85/0xa0 fs/open.c:847 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){+.+.}-{3:3}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752 wait_on_dquot fs/quota/dquot.c:355 [inline] dqget+0x6e6/0xeb0 fs/quota/dquot.c:971 __dquot_initialize+0x2e3/0xec0 fs/quota/dquot.c:1504 __ext4_new_inode+0x852/0x4380 fs/ext4/ialloc.c:991 ext4_ext_migrate+0x6c1/0x13e0 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:697 ioctl_setflags fs/ioctl.c:729 [inline] do_vfs_ioctl+0x207a/0x2e40 fs/ioctl.c:870 __do_sys_ioctl fs/ioctl.c:905 [inline] __se_sys_ioctl+0x81/0x170 fs/ioctl.c:893 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:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904 __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 percpu_down_read+0x44/0x1b0 include/linux/percpu-rwsem.h:51 ext4_writepages_down_read fs/ext4/ext4.h:1772 [inline] ext4_writepages+0x1bf/0x3c0 fs/ext4/inode.c:2812 do_writepages+0x35d/0x870 mm/page-writeback.c:2683 filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:398 __filemap_fdatawrite_range mm/filemap.c:431 [inline] filemap_write_and_wait_range+0x192/0x280 mm/filemap.c:685 filemap_write_and_wait include/linux/pagemap.h:68 [inline] swap_inode_boot_loader fs/ext4/ioctl.c:409 [inline] __ext4_ioctl fs/ext4/ioctl.c:1436 [inline] ext4_ioctl+0x3c55/0x5590 fs/ext4/ioctl.c:1626 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893 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 --> sb_pagefaults --> mapping.invalidate_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(mapping.invalidate_lock); lock(sb_pagefaults); lock(mapping.invalidate_lock); rlock(&sbi->s_writepages_rwsem); *** DEADLOCK *** 4 locks held by syz.4.962/11197: #0: ffff888026aee420 (sb_writers#4){++++}-{0:0}, at: mnt_want_write_file+0x5e/0x200 fs/namespace.c:559 #1: ffff888060670de0 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline] #1: ffff888060670de0 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: lock_two_nondirectories+0xe1/0x170 fs/inode.c:1211 #2: ffff888060675338 (&sb->s_type->i_mutex_key#7/4){+.+.}-{3:3}, at: swap_inode_boot_loader fs/ext4/ioctl.c:391 [inline] #2: ffff888060675338 (&sb->s_type->i_mutex_key#7/4){+.+.}-{3:3}, at: __ext4_ioctl fs/ext4/ioctl.c:1436 [inline] #2: ffff888060675338 (&sb->s_type->i_mutex_key#7/4){+.+.}-{3:3}, at: ext4_ioctl+0x24a1/0x5590 fs/ext4/ioctl.c:1626 #3: ffff888060670f80 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:860 [inline] #3: ffff888060670f80 (mapping.invalidate_lock){++++}-{3:3}, at: swap_inode_boot_loader fs/ext4/ioctl.c:408 [inline] #3: ffff888060670f80 (mapping.invalidate_lock){++++}-{3:3}, at: __ext4_ioctl fs/ext4/ioctl.c:1436 [inline] #3: ffff888060670f80 (mapping.invalidate_lock){++++}-{3:3}, at: ext4_ioctl+0x3c1e/0x5590 fs/ext4/ioctl.c:1626 stack backtrace: CPU: 0 UID: 0 PID: 11197 Comm: syz.4.962 Not tainted 6.12.0-rc3-syzkaller-00044-g2f87d0916ce0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: <TASK> __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:2074 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206 check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904 __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 percpu_down_read+0x44/0x1b0 include/linux/percpu-rwsem.h:51 ext4_writepages_down_read fs/ext4/ext4.h:1772 [inline] ext4_writepages+0x1bf/0x3c0 fs/ext4/inode.c:2812 do_writepages+0x35d/0x870 mm/page-writeback.c:2683 filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:398 __filemap_fdatawrite_range mm/filemap.c:431 [inline] filemap_write_and_wait_range+0x192/0x280 mm/filemap.c:685 filemap_write_and_wait include/linux/pagemap.h:68 [inline] swap_inode_boot_loader fs/ext4/ioctl.c:409 [inline] __ext4_ioctl fs/ext4/ioctl.c:1436 [inline] ext4_ioctl+0x3c55/0x5590 fs/ext4/ioctl.c:1626 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893 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: 0033:0x7f44b937dff9 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:00007f44ba10a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f44b9535f80 RCX: 00007f44b937dff9 RDX: 0000000000000000 RSI: 0000000000006611 RDI: 0000000000000004 RBP: 00007f44b93f0296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f44b9535f80 R15: 00007fffc7835df8 </TASK> --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
