R10: 0000000000000000 R11: 0000000000000282 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ====================================================== WARNING: possible circular locking dependency detected 6.4.0-syzkaller-12155-ga452483508d7 #0 Not tainted ------------------------------------------------------ syz-executor.1/28528 is trying to acquire lock: ffffffff8cb08b40 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:303 [inline] ffffffff8cb08b40 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slab.h:709 [inline] ffffffff8cb08b40 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:3452 [inline] ffffffff8cb08b40 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc mm/slub.c:3478 [inline] ffffffff8cb08b40 (fs_reclaim){+.+.}-{0:0}, at: __kmem_cache_alloc_lru mm/slub.c:3485 [inline] ffffffff8cb08b40 (fs_reclaim){+.+.}-{0:0}, at: kmem_cache_alloc+0x48/0x380 mm/slub.c:3494 but task is already holding lock: ffff88802995e688 (&ei->i_data_sem){++++}-{3:3}, at: ext4_da_map_blocks fs/ext4/inode.c:1698 [inline] ffff88802995e688 (&ei->i_data_sem){++++}-{3:3}, at: ext4_da_get_block_prep+0x85c/0x1170 fs/ext4/inode.c:1813 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&ei->i_data_sem){++++}-{3:3}: down_write+0x92/0x200 kernel/locking/rwsem.c:1573 ext4_truncate+0xd50/0x1340 fs/ext4/inode.c:4122 ext4_evict_inode+0x7ef/0x1a30 fs/ext4/inode.c:258 evict+0x2ed/0x6b0 fs/inode.c:665 iput_final fs/inode.c:1789 [inline] iput.part.0+0x50a/0x740 fs/inode.c:1815 iput+0x5c/0x80 fs/inode.c:1805 ext4_orphan_cleanup+0x6f2/0x1120 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5577 [inline] ext4_fill_super+0x9b04/0xb0f0 fs/ext4/super.c:5696 get_tree_bdev+0x43e/0x7d0 fs/super.c:1318 vfs_get_tree+0x8d/0x350 fs/super.c:1519 do_new_mount fs/namespace.c:3335 [inline] path_mount+0x136e/0x1e70 fs/namespace.c:3662 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount fs/namespace.c:3861 [inline] __ia32_sys_mount+0x282/0x300 fs/namespace.c:3861 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 -> #1 (sb_internal){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1494 [inline] sb_start_intwrite include/linux/fs.h:1616 [inline] ext4_evict_inode+0xe26/0x1a30 fs/ext4/inode.c:212 evict+0x2ed/0x6b0 fs/inode.c:665 iput_final fs/inode.c:1789 [inline] iput.part.0+0x50a/0x740 fs/inode.c:1815 iput+0x5c/0x80 fs/inode.c:1805 dentry_unlink_inode+0x2b1/0x460 fs/dcache.c:401 __dentry_kill+0x3c0/0x640 fs/dcache.c:607 shrink_dentry_list+0x12c/0x4f0 fs/dcache.c:1201 prune_dcache_sb+0xeb/0x150 fs/dcache.c:1282 super_cache_scan+0x33a/0x590 fs/super.c:104 do_shrink_slab+0x428/0xaa0 mm/vmscan.c:900 shrink_slab_memcg mm/vmscan.c:969 [inline] shrink_slab+0x38f/0x6c0 mm/vmscan.c:1048 shrink_one+0x4f9/0x710 mm/vmscan.c:5403 shrink_many mm/vmscan.c:5453 [inline] lru_gen_shrink_node mm/vmscan.c:5570 [inline] shrink_node+0x20ed/0x3690 mm/vmscan.c:6510 kswapd_shrink_node mm/vmscan.c:7315 [inline] balance_pgdat+0xa02/0x1ac0 mm/vmscan.c:7505 kswapd+0x677/0xd60 mm/vmscan.c:7765 kthread+0x344/0x440 kernel/kthread.c:389 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 -> #0 (fs_reclaim){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3142 [inline] check_prevs_add kernel/locking/lockdep.c:3261 [inline] validate_chain kernel/locking/lockdep.c:3876 [inline] __lock_acquire+0x2e9d/0x5e20 kernel/locking/lockdep.c:5144 lock_acquire kernel/locking/lockdep.c:5761 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5726 __fs_reclaim_acquire mm/page_alloc.c:3602 [inline] fs_reclaim_acquire+0x11d/0x160 mm/page_alloc.c:3616 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slab.h:709 [inline] slab_alloc_node mm/slub.c:3452 [inline] slab_alloc mm/slub.c:3478 [inline] __kmem_cache_alloc_lru mm/slub.c:3485 [inline] kmem_cache_alloc+0x48/0x380 mm/slub.c:3494 kmem_cache_zalloc include/linux/slab.h:693 [inline] __es_alloc_extent fs/ext4/extents_status.c:469 [inline] ext4_es_insert_delayed_block+0x3e6/0x5d0 fs/ext4/extents_status.c:2044 ext4_insert_delayed_block fs/ext4/inode.c:1664 [inline] ext4_da_map_blocks fs/ext4/inode.c:1752 [inline] ext4_da_get_block_prep+0x942/0x1170 fs/ext4/inode.c:1813 ext4_block_write_begin+0x3be/0xdd0 fs/ext4/inode.c:1043 ext4_da_write_begin+0x407/0x8c0 fs/ext4/inode.c:2892 generic_perform_write+0x26b/0x5d0 mm/filemap.c:3923 ext4_buffered_write_iter+0x123/0x3d0 fs/ext4/file.c:299 ext4_file_write_iter+0x8f2/0x1880 fs/ext4/file.c:722 call_write_iter include/linux/fs.h:1871 [inline] do_iter_readv_writev+0x211/0x3b0 fs/read_write.c:735 do_iter_write+0x182/0x810 fs/read_write.c:860 vfs_writev+0x1b0/0x670 fs/read_write.c:933 do_pwritev+0x1ad/0x260 fs/read_write.c:1030 __do_compat_sys_pwritev2 fs/read_write.c:1176 [inline] __se_compat_sys_pwritev2 fs/read_write.c:1168 [inline] __ia32_compat_sys_pwritev2+0x121/0x1b0 fs/read_write.c:1168 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 other info that might help us debug this: Chain exists of: fs_reclaim --> sb_internal --> &ei->i_data_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(&ei->i_data_sem); lock(sb_internal); lock(&ei->i_data_sem); lock(fs_reclaim); *** DEADLOCK *** 3 locks held by syz-executor.1/28528: #0: ffff88801e05e410 (sb_writers#4){.+.+}-{0:0}, at: do_pwritev+0x1ad/0x260 fs/read_write.c:1030 #1: ffff88802995e800 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:771 [inline] #1: ffff88802995e800 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb4/0x3d0 fs/ext4/file.c:294 #2: ffff88802995e688 (&ei->i_data_sem){++++}-{3:3}, at: ext4_da_map_blocks fs/ext4/inode.c:1698 [inline] #2: ffff88802995e688 (&ei->i_data_sem){++++}-{3:3}, at: ext4_da_get_block_prep+0x85c/0x1170 fs/ext4/inode.c:1813 stack backtrace: CPU: 2 PID: 28528 Comm: syz-executor.1 Not tainted 6.4.0-syzkaller-12155-ga452483508d7 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 check_noncircular+0x2df/0x3b0 kernel/locking/lockdep.c:2195 check_prev_add kernel/locking/lockdep.c:3142 [inline] check_prevs_add kernel/locking/lockdep.c:3261 [inline] validate_chain kernel/locking/lockdep.c:3876 [inline] __lock_acquire+0x2e9d/0x5e20 kernel/locking/lockdep.c:5144 lock_acquire kernel/locking/lockdep.c:5761 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5726 __fs_reclaim_acquire mm/page_alloc.c:3602 [inline] fs_reclaim_acquire+0x11d/0x160 mm/page_alloc.c:3616 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slab.h:709 [inline] slab_alloc_node mm/slub.c:3452 [inline] slab_alloc mm/slub.c:3478 [inline] __kmem_cache_alloc_lru mm/slub.c:3485 [inline] kmem_cache_alloc+0x48/0x380 mm/slub.c:3494 kmem_cache_zalloc include/linux/slab.h:693 [inline] __es_alloc_extent fs/ext4/extents_status.c:469 [inline] ext4_es_insert_delayed_block+0x3e6/0x5d0 fs/ext4/extents_status.c:2044 ext4_insert_delayed_block fs/ext4/inode.c:1664 [inline] ext4_da_map_blocks fs/ext4/inode.c:1752 [inline] ext4_da_get_block_prep+0x942/0x1170 fs/ext4/inode.c:1813 ext4_block_write_begin+0x3be/0xdd0 fs/ext4/inode.c:1043 ext4_da_write_begin+0x407/0x8c0 fs/ext4/inode.c:2892 generic_perform_write+0x26b/0x5d0 mm/filemap.c:3923 ext4_buffered_write_iter+0x123/0x3d0 fs/ext4/file.c:299 ext4_file_write_iter+0x8f2/0x1880 fs/ext4/file.c:722 call_write_iter include/linux/fs.h:1871 [inline] do_iter_readv_writev+0x211/0x3b0 fs/read_write.c:735 do_iter_write+0x182/0x810 fs/read_write.c:860 vfs_writev+0x1b0/0x670 fs/read_write.c:933 do_pwritev+0x1ad/0x260 fs/read_write.c:1030 __do_compat_sys_pwritev2 fs/read_write.c:1176 [inline] __se_compat_sys_pwritev2 fs/read_write.c:1168 [inline] __ia32_compat_sys_pwritev2+0x121/0x1b0 fs/read_write.c:1168 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 RIP: 0023:0xf7f43579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f7f3e5cc EFLAGS: 00000296 ORIG_RAX: 000000000000017b RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000020000040 RDX: 0000000000000001 RSI: 000000000000fdef RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000282 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 retq 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi