RBP: 00007fa84d02d120 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 000000000000000b R14: 00007fa84c3abf80 R15: 00007fffd931e348 ====================================================== WARNING: possible circular locking dependency detected 6.8.0-rc4-syzkaller-00265-gdced881ead78 #0 Not tainted ------------------------------------------------------ syz-executor.3/23384 is trying to acquire lock: ffffffff8e219220 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:303 [inline] ffffffff8e219220 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slub.c:3761 [inline] ffffffff8e219220 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:3842 [inline] ffffffff8e219220 (fs_reclaim){+.+.}-{0:0}, at: kmem_cache_alloc+0x48/0x340 mm/slub.c:3867 but task is already holding lock: ffff88814d055288 (&ei->i_data_sem){++++}-{3:3}, at: ext4_da_map_blocks fs/ext4/inode.c:1776 [inline] ffff88814d055288 (&ei->i_data_sem){++++}-{3:3}, at: ext4_da_get_block_prep+0x8c4/0x1420 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}: lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754 down_write+0x3a/0x50 kernel/locking/rwsem.c:1579 ext4_truncate+0x981/0x1130 fs/ext4/inode.c:4141 ext4_setattr+0x119a/0x1bb0 fs/ext4/inode.c:5454 notify_change+0xb9d/0xe70 fs/attr.c:499 do_truncate+0x220/0x310 fs/open.c:66 do_sys_ftruncate+0x2f7/0x390 fs/open.c:194 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 -> #2 (jbd2_handle){++++}-{0:0}: lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754 start_this_handle+0x205c/0x22a0 fs/jbd2/transaction.c:463 jbd2__journal_start+0x2d9/0x5d0 fs/jbd2/transaction.c:520 __ext4_journal_start_sb+0x215/0x5b0 fs/ext4/ext4_jbd2.c:112 ext4_sample_last_mounted fs/ext4/file.c:837 [inline] ext4_file_open+0x53e/0x760 fs/ext4/file.c:866 do_dentry_open+0x907/0x15a0 fs/open.c:953 do_open fs/namei.c:3641 [inline] path_openat+0x285f/0x3240 fs/namei.c:3798 do_filp_open+0x234/0x490 fs/namei.c:3825 do_sys_openat2+0x13e/0x1d0 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+0x247/0x2a0 fs/open.c:1430 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 -> #1 (sb_internal){.+.+}-{0:0}: lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754 percpu_down_read+0x44/0x1b0 include/linux/percpu-rwsem.h:51 __sb_start_write include/linux/fs.h:1639 [inline] sb_start_intwrite include/linux/fs.h:1822 [inline] ext4_evict_inode+0x2e3/0xf30 fs/ext4/inode.c:212 evict+0x2a8/0x630 fs/inode.c:665 __dentry_kill+0x20d/0x630 fs/dcache.c:603 shrink_kill+0xa9/0x2c0 fs/dcache.c:1048 shrink_dentry_list+0x2c0/0x5b0 fs/dcache.c:1075 prune_dcache_sb+0x10f/0x180 fs/dcache.c:1156 super_cache_scan+0x34f/0x4b0 fs/super.c:221 do_shrink_slab+0x6d0/0x1140 mm/shrinker.c:435 shrink_slab_memcg mm/shrinker.c:548 [inline] shrink_slab+0x883/0x14d0 mm/shrinker.c:626 shrink_one+0x423/0x7e0 mm/vmscan.c:4767 shrink_many mm/vmscan.c:4828 [inline] lru_gen_shrink_node mm/vmscan.c:4929 [inline] shrink_node+0x375e/0x3e20 mm/vmscan.c:5888 kswapd_shrink_node mm/vmscan.c:6693 [inline] balance_pgdat mm/vmscan.c:6883 [inline] kswapd+0x17d0/0x36d0 mm/vmscan.c:7143 kthread+0x2ef/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242 -> #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+0x18ca/0x58e0 kernel/locking/lockdep.c:3869 __lock_acquire+0x1345/0x1fd0 kernel/locking/lockdep.c:5137 lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754 __fs_reclaim_acquire mm/page_alloc.c:3692 [inline] fs_reclaim_acquire+0x87/0x130 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+0x48/0x340 mm/slub.c:3867 ext4_es_insert_delayed_block+0x2d9/0xa10 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+0xa67/0x1420 fs/ext4/inode.c:1817 ext4_block_write_begin+0x53b/0x1850 fs/ext4/inode.c:1055 ext4_da_write_begin+0x5e8/0xa50 fs/ext4/inode.c:2894 generic_perform_write+0x321/0x640 mm/filemap.c:3930 ext4_buffered_write_iter+0xc6/0x350 fs/ext4/file.c:299 ext4_file_write_iter+0x1dc/0x19c0 call_write_iter include/linux/fs.h:2085 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0xa81/0xcb0 fs/read_write.c:590 ksys_write+0x1a0/0x2c0 fs/read_write.c:643 do_syscall_64+0xf9/0x240 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 *** 4 locks held by syz-executor.3/23384: #0: ffff8880a26d0d48 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x258/0x320 fs/file.c:1191 #1: ffff888030076420 (sb_writers#4){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2792 [inline] #1: ffff888030076420 (sb_writers#4){.+.+}-{0:0}, at: vfs_write+0x233/0xcb0 fs/read_write.c:586 #2: ffff88814d055400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline] #2: ffff88814d055400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0x97/0x350 fs/ext4/file.c:294 #3: ffff88814d055288 (&ei->i_data_sem){++++}-{3:3}, at: ext4_da_map_blocks fs/ext4/inode.c:1776 [inline] #3: ffff88814d055288 (&ei->i_data_sem){++++}-{3:3}, at: ext4_da_get_block_prep+0x8c4/0x1420 fs/ext4/inode.c:1817 stack backtrace: CPU: 0 PID: 23384 Comm: syz-executor.3 Not tainted 6.8.0-rc4-syzkaller-00265-gdced881ead78 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106 check_noncircular+0x36a/0x4a0 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+0x18ca/0x58e0 kernel/locking/lockdep.c:3869 __lock_acquire+0x1345/0x1fd0 kernel/locking/lockdep.c:5137 lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754 __fs_reclaim_acquire mm/page_alloc.c:3692 [inline] fs_reclaim_acquire+0x87/0x130 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+0x48/0x340 mm/slub.c:3867 ext4_es_insert_delayed_block+0x2d9/0xa10 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+0xa67/0x1420 fs/ext4/inode.c:1817 ext4_block_write_begin+0x53b/0x1850 fs/ext4/inode.c:1055 ext4_da_write_begin+0x5e8/0xa50 fs/ext4/inode.c:2894 generic_perform_write+0x321/0x640 mm/filemap.c:3930 ext4_buffered_write_iter+0xc6/0x350 fs/ext4/file.c:299 ext4_file_write_iter+0x1dc/0x19c0 call_write_iter include/linux/fs.h:2085 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0xa81/0xcb0 fs/read_write.c:590 ksys_write+0x1a0/0x2c0 fs/read_write.c:643 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7fa84c27dda9 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:00007fa84d02d0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fa84c3abf80 RCX: 00007fa84c27dda9 RDX: 0000000000040010 RSI: 0000000020000180 RDI: 0000000000000004 RBP: 00007fa84d02d120 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 000000000000000b R14: 00007fa84c3abf80 R15: 00007fffd931e348