R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 000000000000000b R14: 00007f28e45abf80 R15: 00007fffea5134a8 ====================================================== WARNING: possible circular locking dependency detected 6.8.0-rc7-syzkaller-00238-g005f6f34bd47 #0 Not tainted ------------------------------------------------------ syz-executor.0/10916 is trying to acquire lock: ffffffff8d91e080 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:303 [inline] ffffffff8d91e080 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slub.c:3761 [inline] ffffffff8d91e080 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:3842 [inline] ffffffff8d91e080 (fs_reclaim){+.+.}-{0:0}, at: kmem_cache_alloc+0x4f/0x320 mm/slub.c:3867 but task is already holding lock: ffff888031ffe688 (&ei->i_data_sem){++++}-{3:3}, at: ext4_da_map_blocks fs/ext4/inode.c:1776 [inline] ffff888031ffe688 (&ei->i_data_sem){++++}-{3:3}, at: ext4_da_get_block_prep+0x770/0x1320 fs/ext4/inode.c:1817 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&ei->i_data_sem){++++}-{3:3}: down_write+0x3a/0x50 kernel/locking/rwsem.c:1579 ext4_map_blocks+0x5ab/0x17d0 fs/ext4/inode.c:616 mpage_map_one_extent fs/ext4/inode.c:2163 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2216 [inline] ext4_do_writepages+0x1852/0x3360 fs/ext4/inode.c:2679 ext4_writepages+0x30c/0x780 fs/ext4/inode.c:2768 do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 __writeback_single_inode+0x158/0xe90 fs/fs-writeback.c:1625 writeback_sb_inodes+0x59d/0x1080 fs/fs-writeback.c:1916 __writeback_inodes_wb+0xff/0x2e0 fs/fs-writeback.c:1987 wb_writeback+0x7f8/0xaa0 fs/fs-writeback.c:2094 wb_check_background_flush fs/fs-writeback.c:2164 [inline] wb_do_writeback fs/fs-writeback.c:2252 [inline] wb_workfn+0x880/0xfe0 fs/fs-writeback.c:2279 process_one_work+0x889/0x15e0 kernel/workqueue.c:2633 process_scheduled_works kernel/workqueue.c:2706 [inline] worker_thread+0x8b9/0x12a0 kernel/workqueue.c:2787 kthread+0x2c6/0x3b0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243 -> #2 (jbd2_handle){++++}-{0:0}: start_this_handle+0x1103/0x15e0 fs/jbd2/transaction.c:463 jbd2__journal_start+0x395/0x850 fs/jbd2/transaction.c:520 __ext4_journal_start_sb+0x347/0x5e0 fs/ext4/ext4_jbd2.c:112 ext4_sample_last_mounted fs/ext4/file.c:837 [inline] ext4_file_open+0x636/0xc80 fs/ext4/file.c:866 do_dentry_open+0x8da/0x18c0 fs/open.c:953 do_open fs/namei.c:3645 [inline] path_openat+0x1e00/0x29a0 fs/namei.c:3802 do_filp_open+0x1de/0x440 fs/namei.c:3829 do_sys_openat2+0x17a/0x1e0 fs/open.c:1404 do_sys_open fs/open.c:1419 [inline] __do_sys_openat fs/open.c:1435 [inline] __se_sys_openat fs/open.c:1430 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1430 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6f/0x77 -> #1 (sb_internal){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1641 [inline] sb_start_intwrite include/linux/fs.h:1824 [inline] ext4_evict_inode+0xe5f/0x1a40 fs/ext4/inode.c:212 evict+0x2ed/0x6c0 fs/inode.c:665 iput_final fs/inode.c:1739 [inline] iput.part.0+0x563/0x7b0 fs/inode.c:1765 iput+0x5c/0x80 fs/inode.c:1755 dentry_unlink_inode+0x295/0x440 fs/dcache.c:400 __dentry_kill+0x1d0/0x600 fs/dcache.c:603 shrink_kill fs/dcache.c:1048 [inline] shrink_dentry_list+0x140/0x5d0 fs/dcache.c:1075 prune_dcache_sb+0xeb/0x150 fs/dcache.c:1156 super_cache_scan+0x32a/0x550 fs/super.c:221 do_shrink_slab+0x426/0x1120 mm/shrinker.c:435 shrink_slab_memcg mm/shrinker.c:548 [inline] shrink_slab+0xa87/0x1310 mm/shrinker.c:626 shrink_one+0x493/0x7b0 mm/vmscan.c:4767 shrink_many mm/vmscan.c:4828 [inline] lru_gen_shrink_node mm/vmscan.c:4929 [inline] shrink_node+0x2158/0x3780 mm/vmscan.c:5888 kswapd_shrink_node mm/vmscan.c:6696 [inline] balance_pgdat+0x9d2/0x1a90 mm/vmscan.c:6886 kswapd+0x5be/0xc00 mm/vmscan.c:7146 kthread+0x2c6/0x3b0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243 -> #0 (fs_reclaim){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x244f/0x3b40 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719 __fs_reclaim_acquire mm/page_alloc.c:3692 [inline] fs_reclaim_acquire+0x104/0x150 mm/page_alloc.c:3706 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slub.c:3761 [inline] slab_alloc_node mm/slub.c:3842 [inline] kmem_cache_alloc+0x4f/0x320 mm/slub.c:3867 kmem_cache_zalloc include/linux/slab.h:701 [inline] __es_alloc_extent fs/ext4/extents_status.c:483 [inline] ext4_es_insert_delayed_block+0x546/0x760 fs/ext4/extents_status.c:2090 ext4_insert_delayed_block fs/ext4/inode.c:1676 [inline] ext4_da_map_blocks fs/ext4/inode.c:1777 [inline] ext4_da_get_block_prep+0x850/0x1320 fs/ext4/inode.c:1817 ext4_block_write_begin+0x3da/0xef0 fs/ext4/inode.c:1055 ext4_da_write_begin+0x40e/0x8c0 fs/ext4/inode.c:2894 generic_perform_write+0x273/0x620 mm/filemap.c:3930 ext4_buffered_write_iter+0x11f/0x3d0 fs/ext4/file.c:299 ext4_file_write_iter+0x819/0x1960 fs/ext4/file.c:698 call_write_iter include/linux/fs.h:2087 [inline] aio_write+0x3bc/0x8d0 fs/aio.c:1639 __io_submit_one fs/aio.c:2011 [inline] io_submit_one+0x11b6/0x1df0 fs/aio.c:2058 __do_sys_io_submit fs/aio.c:2117 [inline] __se_sys_io_submit fs/aio.c:2087 [inline] __x64_sys_io_submit+0x1c3/0x360 fs/aio.c:2087 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6f/0x77 other info that might help us debug this: Chain exists of: fs_reclaim --> jbd2_handle --> &ei->i_data_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ei->i_data_sem); lock(jbd2_handle); lock(&ei->i_data_sem); lock(fs_reclaim); *** DEADLOCK *** 2 locks held by syz-executor.0/10916: #0: ffff888031ffe800 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline] #0: ffff888031ffe800 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x3d0 fs/ext4/file.c:294 #1: ffff888031ffe688 (&ei->i_data_sem){++++}-{3:3}, at: ext4_da_map_blocks fs/ext4/inode.c:1776 [inline] #1: ffff888031ffe688 (&ei->i_data_sem){++++}-{3:3}, at: ext4_da_get_block_prep+0x770/0x1320 fs/ext4/inode.c:1817 stack backtrace: CPU: 0 PID: 10916 Comm: syz-executor.0 Not tainted 6.8.0-rc7-syzkaller-00238-g005f6f34bd47 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 check_noncircular+0x31b/0x400 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x244f/0x3b40 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719 __fs_reclaim_acquire mm/page_alloc.c:3692 [inline] fs_reclaim_acquire+0x104/0x150 mm/page_alloc.c:3706 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slub.c:3761 [inline] slab_alloc_node mm/slub.c:3842 [inline] kmem_cache_alloc+0x4f/0x320 mm/slub.c:3867 kmem_cache_zalloc include/linux/slab.h:701 [inline] __es_alloc_extent fs/ext4/extents_status.c:483 [inline] ext4_es_insert_delayed_block+0x546/0x760 fs/ext4/extents_status.c:2090 ext4_insert_delayed_block fs/ext4/inode.c:1676 [inline] ext4_da_map_blocks fs/ext4/inode.c:1777 [inline] ext4_da_get_block_prep+0x850/0x1320 fs/ext4/inode.c:1817 ext4_block_write_begin+0x3da/0xef0 fs/ext4/inode.c:1055 ext4_da_write_begin+0x40e/0x8c0 fs/ext4/inode.c:2894 generic_perform_write+0x273/0x620 mm/filemap.c:3930 ext4_buffered_write_iter+0x11f/0x3d0 fs/ext4/file.c:299 ext4_file_write_iter+0x819/0x1960 fs/ext4/file.c:698 call_write_iter include/linux/fs.h:2087 [inline] aio_write+0x3bc/0x8d0 fs/aio.c:1639 __io_submit_one fs/aio.c:2011 [inline] io_submit_one+0x11b6/0x1df0 fs/aio.c:2058 __do_sys_io_submit fs/aio.c:2117 [inline] __se_sys_io_submit fs/aio.c:2087 [inline] __x64_sys_io_submit+0x1c3/0x360 fs/aio.c:2087 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f28e447dda9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f28e514f0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1 RAX: ffffffffffffffda RBX: 00007f28e45abf80 RCX: 00007f28e447dda9 RDX: 0000000020000540 RSI: 0000000000001801 RDI: 00007f28e5126000 RBP: 00007f28e514f120 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 000000000000000b R14: 00007f28e45abf80 R15: 00007fffea5134a8