R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ====================================================== WARNING: possible circular locking dependency detected 6.6.0-rc4-syzkaller-00016-g5e62ed3b1c8a #0 Not tainted ------------------------------------------------------ syz-executor.1/31013 is trying to acquire lock: ffffffff8cd15e40 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:303 [inline] ffffffff8cd15e40 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slab.h:709 [inline] ffffffff8cd15e40 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:3460 [inline] ffffffff8cd15e40 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc mm/slub.c:3486 [inline] ffffffff8cd15e40 (fs_reclaim){+.+.}-{0:0}, at: __kmem_cache_alloc_lru mm/slub.c:3493 [inline] ffffffff8cd15e40 (fs_reclaim){+.+.}-{0:0}, at: kmem_cache_alloc+0x4f/0x3b0 mm/slub.c:3502 but task is already holding lock: ffff888000e38288 (&ei->i_data_sem){++++}-{3:3}, at: ext4_da_map_blocks fs/ext4/inode.c:1735 [inline] ffff888000e38288 (&ei->i_data_sem){++++}-{3:3}, at: ext4_da_get_block_prep+0x6c9/0x1340 fs/ext4/inode.c:1813 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+0x93/0x200 kernel/locking/rwsem.c:1573 ext4_map_blocks+0x5a7/0x1770 fs/ext4/inode.c:614 mpage_map_one_extent fs/ext4/inode.c:2159 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2212 [inline] ext4_do_writepages+0x1848/0x3340 fs/ext4/inode.c:2675 ext4_writepages+0x30c/0x780 fs/ext4/inode.c:2764 do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 __writeback_single_inode+0x158/0xe70 fs/fs-writeback.c:1608 writeback_sb_inodes+0x599/0x1070 fs/fs-writeback.c:1899 __writeback_inodes_wb+0xff/0x2d0 fs/fs-writeback.c:1970 wb_writeback+0x7f8/0xa90 fs/fs-writeback.c:2077 wb_check_background_flush fs/fs-writeback.c:2147 [inline] wb_do_writeback fs/fs-writeback.c:2235 [inline] wb_workfn+0x874/0xfd0 fs/fs-writeback.c:2262 process_one_work+0x884/0x15c0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784 kthread+0x33c/0x440 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:304 -> #2 (jbd2_handle){++++}-{0:0}: start_this_handle+0x10fc/0x15e0 fs/jbd2/transaction.c:463 jbd2__journal_start+0x391/0x690 fs/jbd2/transaction.c:520 __ext4_journal_start_sb+0x40f/0x5c0 fs/ext4/ext4_jbd2.c:112 ext4_sample_last_mounted fs/ext4/file.c:856 [inline] ext4_file_open+0x632/0xc80 fs/ext4/file.c:885 do_dentry_open+0x88b/0x1730 fs/open.c:929 do_open fs/namei.c:3639 [inline] path_openat+0x19af/0x29c0 fs/namei.c:3796 do_filp_open+0x1de/0x430 fs/namei.c:3823 do_sys_openat2+0x176/0x1e0 fs/open.c:1422 do_sys_open fs/open.c:1437 [inline] __do_sys_openat fs/open.c:1453 [inline] __se_sys_openat fs/open.c:1448 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1448 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #1 (sb_internal){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1571 [inline] sb_start_intwrite include/linux/fs.h:1693 [inline] ext4_evict_inode+0xe55/0x1a30 fs/ext4/inode.c:212 evict+0x2ed/0x6b0 fs/inode.c:664 iput_final fs/inode.c:1775 [inline] iput.part.0+0x55e/0x7a0 fs/inode.c:1801 iput+0x5c/0x80 fs/inode.c:1791 dentry_unlink_inode+0x292/0x430 fs/dcache.c:401 __dentry_kill+0x3b8/0x640 fs/dcache.c:607 shrink_dentry_list+0x22b/0x7d0 fs/dcache.c:1201 prune_dcache_sb+0xeb/0x150 fs/dcache.c:1282 super_cache_scan+0x31f/0x540 fs/super.c:228 do_shrink_slab+0x422/0xaa0 mm/vmscan.c:900 shrink_slab_memcg mm/vmscan.c:969 [inline] shrink_slab+0x48b/0x6e0 mm/vmscan.c:1048 shrink_one+0x4f7/0x700 mm/vmscan.c:5417 shrink_many mm/vmscan.c:5469 [inline] lru_gen_shrink_node mm/vmscan.c:5586 [inline] shrink_node+0x20d4/0x37a0 mm/vmscan.c:6526 kswapd_shrink_node mm/vmscan.c:7331 [inline] balance_pgdat+0xa32/0x1b80 mm/vmscan.c:7521 kswapd+0x5be/0xbf0 mm/vmscan.c:7781 kthread+0x33c/0x440 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:304 -> #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:3868 [inline] __lock_acquire+0x2e3d/0x5de0 kernel/locking/lockdep.c:5136 lock_acquire kernel/locking/lockdep.c:5753 [inline] lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5718 __fs_reclaim_acquire mm/page_alloc.c:3551 [inline] fs_reclaim_acquire+0x100/0x150 mm/page_alloc.c:3565 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slab.h:709 [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/0x3b0 mm/slub.c:3502 kmem_cache_zalloc include/linux/slab.h:710 [inline] __es_alloc_extent fs/ext4/extents_status.c:469 [inline] ext4_es_insert_delayed_block+0x42e/0x610 fs/ext4/extents_status.c:2054 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+0x850/0x1340 fs/ext4/inode.c:1813 ext4_block_write_begin+0x3da/0xf10 fs/ext4/inode.c:1043 ext4_da_write_begin+0x40a/0x8c0 fs/ext4/inode.c:2890 generic_perform_write+0x278/0x600 mm/filemap.c:3969 ext4_buffered_write_iter+0x11f/0x3c0 fs/ext4/file.c:299 ext4_file_write_iter+0x7f7/0x1860 fs/ext4/file.c:717 call_write_iter include/linux/fs.h:1956 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x650/0xe40 fs/read_write.c:584 ksys_write+0x12f/0x250 fs/read_write.c:637 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x61/0xe0 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 --> 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 *** 4 locks held by syz-executor.1/31013: #0: ffff8880228c7cc8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe7/0x170 fs/file.c:1064 #1: ffff888044982410 (sb_writers#4){.+.+}-{0:0}, at: ksys_write+0x12f/0x250 fs/read_write.c:637 #2: ffff888000e38400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline] #2: ffff888000e38400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x3c0 fs/ext4/file.c:294 #3: ffff888000e38288 (&ei->i_data_sem){++++}-{3:3}, at: ext4_da_map_blocks fs/ext4/inode.c:1735 [inline] #3: ffff888000e38288 (&ei->i_data_sem){++++}-{3:3}, at: ext4_da_get_block_prep+0x6c9/0x1340 fs/ext4/inode.c:1813 stack backtrace: CPU: 1 PID: 31013 Comm: syz-executor.1 Not tainted 6.6.0-rc4-syzkaller-00016-g5e62ed3b1c8a #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+0x311/0x3f0 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:3868 [inline] __lock_acquire+0x2e3d/0x5de0 kernel/locking/lockdep.c:5136 lock_acquire kernel/locking/lockdep.c:5753 [inline] lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5718 __fs_reclaim_acquire mm/page_alloc.c:3551 [inline] fs_reclaim_acquire+0x100/0x150 mm/page_alloc.c:3565 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slab.h:709 [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/0x3b0 mm/slub.c:3502 kmem_cache_zalloc include/linux/slab.h:710 [inline] __es_alloc_extent fs/ext4/extents_status.c:469 [inline] ext4_es_insert_delayed_block+0x42e/0x610 fs/ext4/extents_status.c:2054 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+0x850/0x1340 fs/ext4/inode.c:1813 ext4_block_write_begin+0x3da/0xf10 fs/ext4/inode.c:1043 ext4_da_write_begin+0x40a/0x8c0 fs/ext4/inode.c:2890 generic_perform_write+0x278/0x600 mm/filemap.c:3969 ext4_buffered_write_iter+0x11f/0x3c0 fs/ext4/file.c:299 ext4_file_write_iter+0x7f7/0x1860 fs/ext4/file.c:717 call_write_iter include/linux/fs.h:1956 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x650/0xe40 fs/read_write.c:584 ksys_write+0x12f/0x250 fs/read_write.c:637 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x61/0xe0 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: 0023:0xf7f02579 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:00000000f7efd5ac EFLAGS: 00000292 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000180 RDX: 000000000208e24b RSI: 0000000000000000 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