R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ====================================================== WARNING: possible circular locking dependency detected 6.7.0-rc5-syzkaller-00134-g3f7168591ebf #0 Not tainted ------------------------------------------------------ syz-executor.0/20476 is trying to acquire lock: ffffffff8d11ca60 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:303 [inline] ffffffff8d11ca60 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slab.h:710 [inline] ffffffff8d11ca60 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:3460 [inline] ffffffff8d11ca60 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc mm/slub.c:3486 [inline] ffffffff8d11ca60 (fs_reclaim){+.+.}-{0:0}, at: __kmem_cache_alloc_lru mm/slub.c:3493 [inline] ffffffff8d11ca60 (fs_reclaim){+.+.}-{0:0}, at: kmem_cache_alloc+0x4f/0x2f0 mm/slub.c:3502 but task is already holding lock: ffff888026637088 (&ei->i_data_sem){++++}-{3:3}, at: ext4_da_map_blocks fs/ext4/inode.c:1708 [inline] ffff888026637088 (&ei->i_data_sem){++++}-{3:3}, at: ext4_da_get_block_prep+0xc75/0x1340 fs/ext4/inode.c:1823 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_truncate+0xd1d/0x1310 fs/ext4/inode.c:4164 ext4_setattr+0x1a2e/0x29d0 fs/ext4/inode.c:5477 notify_change+0x742/0x11c0 fs/attr.c:499 do_truncate+0x15c/0x220 fs/open.c:66 do_sys_ftruncate+0x6a2/0x790 fs/open.c:194 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b -> #2 (jbd2_handle){++++}-{0:0}: start_this_handle+0x10ff/0x15e0 fs/jbd2/transaction.c:463 jbd2__journal_start+0x391/0x840 fs/jbd2/transaction.c:520 __ext4_journal_start_sb+0x343/0x5d0 fs/ext4/ext4_jbd2.c:112 ext4_sample_last_mounted fs/ext4/file.c:837 [inline] ext4_file_open+0x632/0xc80 fs/ext4/file.c:866 do_dentry_open+0x8d6/0x18c0 fs/open.c:948 do_open fs/namei.c:3622 [inline] path_openat+0x1e5a/0x2c50 fs/namei.c:3779 do_filp_open+0x1de/0x430 fs/namei.c:3809 do_sys_openat2+0x176/0x1e0 fs/open.c:1440 do_sys_open fs/open.c:1455 [inline] __do_sys_openat fs/open.c:1471 [inline] __se_sys_openat fs/open.c:1466 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1466 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b -> #1 (sb_internal){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1635 [inline] sb_start_intwrite include/linux/fs.h:1757 [inline] ext4_evict_inode+0xe5b/0x1a40 fs/ext4/inode.c:212 evict+0x2ed/0x6b0 fs/inode.c:666 iput_final fs/inode.c:1777 [inline] iput.part.0+0x560/0x7b0 fs/inode.c:1803 iput+0x5c/0x80 fs/inode.c:1793 dentry_unlink_inode+0x292/0x430 fs/dcache.c:401 __dentry_kill+0x3b8/0x640 fs/dcache.c:607 shrink_dentry_list+0x11e/0x4a0 fs/dcache.c:1201 prune_dcache_sb+0xeb/0x150 fs/dcache.c:1282 super_cache_scan+0x327/0x540 fs/super.c:228 do_shrink_slab+0x428/0x1120 mm/shrinker.c:435 shrink_slab_memcg mm/shrinker.c:548 [inline] shrink_slab+0xa83/0x1310 mm/shrinker.c:626 shrink_one+0x4f7/0x700 mm/vmscan.c:4724 shrink_many mm/vmscan.c:4776 [inline] lru_gen_shrink_node mm/vmscan.c:4893 [inline] shrink_node+0x20cd/0x3790 mm/vmscan.c:5833 kswapd_shrink_node mm/vmscan.c:6638 [inline] balance_pgdat+0x9d2/0x1a90 mm/vmscan.c:6828 kswapd+0x5be/0xbf0 mm/vmscan.c:7088 kthread+0x2c6/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 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 kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2433/0x3b20 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:3693 [inline] fs_reclaim_acquire+0x100/0x150 mm/page_alloc.c:3707 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slab.h:710 [inline] slab_alloc_node mm/slub.c:3460 [inline] slab_alloc mm/slub.c:3486 [inline] __kmem_cache_alloc_lru mm/slub.c:3493 [inline] kmem_cache_alloc+0x4f/0x2f0 mm/slub.c:3502 kmem_cache_zalloc include/linux/slab.h:711 [inline] __es_alloc_extent fs/ext4/extents_status.c:483 [inline] ext4_es_insert_delayed_block+0x542/0x760 fs/ext4/extents_status.c:2090 ext4_insert_delayed_block fs/ext4/inode.c:1674 [inline] ext4_da_map_blocks fs/ext4/inode.c:1762 [inline] ext4_da_get_block_prep+0x850/0x1340 fs/ext4/inode.c:1823 ext4_block_write_begin+0x3da/0xee0 fs/ext4/inode.c:1053 ext4_da_write_begin+0x40a/0x8c0 fs/ext4/inode.c:2900 generic_perform_write+0x278/0x600 mm/filemap.c:3918 ext4_buffered_write_iter+0x11f/0x3c0 fs/ext4/file.c:299 ext4_file_write_iter+0x819/0x1950 fs/ext4/file.c:698 call_write_iter include/linux/fs.h:2020 [inline] do_iter_readv_writev+0x21e/0x3c0 fs/read_write.c:735 do_iter_write+0x17f/0x7f0 fs/read_write.c:860 vfs_iter_write+0x7a/0xb0 fs/read_write.c:901 iter_file_splice_write+0x698/0xc00 fs/splice.c:736 do_splice_from fs/splice.c:933 [inline] direct_splice_actor+0x118/0x180 fs/splice.c:1142 splice_direct_to_actor+0x347/0xa30 fs/splice.c:1088 do_splice_direct+0x1af/0x280 fs/splice.c:1194 do_sendfile+0xb3e/0x1310 fs/read_write.c:1254 __do_compat_sys_sendfile fs/read_write.c:1343 [inline] __se_compat_sys_sendfile fs/read_write.c:1326 [inline] __ia32_compat_sys_sendfile+0x1e3/0x220 fs/read_write.c:1326 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x62/0xe0 arch/x86/entry/common.c:321 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x70/0x7a 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 ---- ---- rlock(&ei->i_data_sem); lock(jbd2_handle); lock(&ei->i_data_sem); lock(fs_reclaim); *** DEADLOCK *** 3 locks held by syz-executor.0/20476: #0: ffff88801a616418 (sb_writers#4){.+.+}-{0:0}, at: __do_compat_sys_sendfile fs/read_write.c:1343 [inline] #0: ffff88801a616418 (sb_writers#4){.+.+}-{0:0}, at: __se_compat_sys_sendfile fs/read_write.c:1326 [inline] #0: ffff88801a616418 (sb_writers#4){.+.+}-{0:0}, at: __ia32_compat_sys_sendfile+0x1e3/0x220 fs/read_write.c:1326 #1: ffff888026637200 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline] #1: ffff888026637200 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x3c0 fs/ext4/file.c:294 #2: ffff888026637088 (&ei->i_data_sem){++++}-{3:3}, at: ext4_da_map_blocks fs/ext4/inode.c:1708 [inline] #2: ffff888026637088 (&ei->i_data_sem){++++}-{3:3}, at: ext4_da_get_block_prep+0xc75/0x1340 fs/ext4/inode.c:1823 stack backtrace: CPU: 1 PID: 20476 Comm: syz-executor.0 Not tainted 6.7.0-rc5-syzkaller-00134-g3f7168591ebf #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+0x317/0x400 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+0x2433/0x3b20 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:3693 [inline] fs_reclaim_acquire+0x100/0x150 mm/page_alloc.c:3707 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slab.h:710 [inline] slab_alloc_node mm/slub.c:3460 [inline] slab_alloc mm/slub.c:3486 [inline] __kmem_cache_alloc_lru mm/slub.c:3493 [inline] kmem_cache_alloc+0x4f/0x2f0 mm/slub.c:3502 kmem_cache_zalloc include/linux/slab.h:711 [inline] __es_alloc_extent fs/ext4/extents_status.c:483 [inline] ext4_es_insert_delayed_block+0x542/0x760 fs/ext4/extents_status.c:2090 ext4_insert_delayed_block fs/ext4/inode.c:1674 [inline] ext4_da_map_blocks fs/ext4/inode.c:1762 [inline] ext4_da_get_block_prep+0x850/0x1340 fs/ext4/inode.c:1823 ext4_block_write_begin+0x3da/0xee0 fs/ext4/inode.c:1053 ext4_da_write_begin+0x40a/0x8c0 fs/ext4/inode.c:2900 generic_perform_write+0x278/0x600 mm/filemap.c:3918 ext4_buffered_write_iter+0x11f/0x3c0 fs/ext4/file.c:299 ext4_file_write_iter+0x819/0x1950 fs/ext4/file.c:698 call_write_iter include/linux/fs.h:2020 [inline] do_iter_readv_writev+0x21e/0x3c0 fs/read_write.c:735 do_iter_write+0x17f/0x7f0 fs/read_write.c:860 vfs_iter_write+0x7a/0xb0 fs/read_write.c:901 iter_file_splice_write+0x698/0xc00 fs/splice.c:736 do_splice_from fs/splice.c:933 [inline] direct_splice_actor+0x118/0x180 fs/splice.c:1142 splice_direct_to_actor+0x347/0xa30 fs/splice.c:1088 do_splice_direct+0x1af/0x280 fs/splice.c:1194 do_sendfile+0xb3e/0x1310 fs/read_write.c:1254 __do_compat_sys_sendfile fs/read_write.c:1343 [inline] __se_compat_sys_sendfile fs/read_write.c:1326 [inline] __ia32_compat_sys_sendfile+0x1e3/0x220 fs/read_write.c:1326 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x62/0xe0 arch/x86/entry/common.c:321 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x70/0x7a RIP: 0023:0xf7f9f579 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:00000000f7f9a5ac EFLAGS: 00000292 ORIG_RAX: 00000000000000bb RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000004 RDX: 0000000000000000 RSI: 0000000000211005 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 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 ret 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