warning: checkpointing journal with EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT can be slow ================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x3f2f/0x56c0 kernel/locking/lockdep.c:4897 Read of size 8 at addr ffff888031519df8 by task syz-executor.2/31810 CPU: 1 PID: 31810 Comm: syz-executor.2 Not tainted 5.17.0-rc8-syzkaller-00045-g551acdc3c3d2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x8d/0x303 mm/kasan/report.c:255 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 __lock_acquire+0x3f2f/0x56c0 kernel/locking/lockdep.c:4897 lock_acquire kernel/locking/lockdep.c:5639 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5604 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:349 [inline] jbd2_journal_wait_updates+0x221/0x2b0 fs/jbd2/transaction.c:861 jbd2_journal_lock_updates+0x183/0x350 fs/jbd2/transaction.c:896 ext4_ioctl_checkpoint fs/ext4/ioctl.c:1085 [inline] __ext4_ioctl+0x1fba/0x57e0 fs/ext4/ioctl.c:1562 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f16d7183049 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f16d5ad7168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f16d7296030 RCX: 00007f16d7183049 RDX: 0000000020000000 RSI: 000000004004662b RDI: 0000000000000005 RBP: 00007f16d71dd08d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffef06952cf R14: 00007f16d5ad7300 R15: 0000000000022000 Allocated by task 31790: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] __kasan_slab_alloc+0x85/0xb0 mm/kasan/common.c:469 kasan_slab_alloc include/linux/kasan.h:260 [inline] slab_post_alloc_hook mm/slab.h:732 [inline] slab_alloc mm/slab.c:3315 [inline] kmem_cache_alloc+0x265/0x560 mm/slab.c:3499 kmem_cache_zalloc include/linux/slab.h:704 [inline] start_this_handle+0x66e/0x1380 fs/jbd2/transaction.c:375 jbd2__journal_start+0x386/0x6b0 fs/jbd2/transaction.c:525 __ext4_journal_start_sb+0x3a8/0x4a0 fs/ext4/ext4_jbd2.c:105 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_dirty_inode+0x9d/0x110 fs/ext4/inode.c:5899 __mark_inode_dirty+0x45b/0xfe0 fs/fs-writeback.c:2409 generic_update_time+0x21d/0x350 fs/inode.c:1856 inode_update_time fs/inode.c:1869 [inline] file_update_time+0x434/0x520 fs/inode.c:2086 file_modified fs/inode.c:2109 [inline] file_modified+0x7d/0xa0 fs/inode.c:2094 ext4_write_checks fs/ext4/file.c:247 [inline] ext4_buffered_write_iter+0xf9/0x390 fs/ext4/file.c:263 ext4_file_write_iter+0x423/0x14d0 fs/ext4/file.c:677 call_write_iter include/linux/fs.h:2074 [inline] new_sync_write+0x431/0x660 fs/read_write.c:503 vfs_write+0x7cd/0xae0 fs/read_write.c:590 ksys_write+0x12d/0x250 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 31814: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0xff/0x140 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:236 [inline] __cache_free mm/slab.c:3437 [inline] kmem_cache_free.part.0+0x91/0x200 mm/slab.c:3733 jbd2_journal_free_transaction+0x30/0x40 fs/jbd2/transaction.c:62 __jbd2_journal_remove_checkpoint+0x438/0x840 fs/jbd2/checkpoint.c:735 jbd2_log_do_checkpoint+0x494/0xf70 fs/jbd2/checkpoint.c:354 jbd2_journal_flush+0x1a5/0xc70 fs/jbd2/journal.c:2465 ext4_ioctl_checkpoint fs/ext4/ioctl.c:1086 [inline] __ext4_ioctl+0x200d/0x57e0 fs/ext4/ioctl.c:1562 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff888031519d80 which belongs to the cache jbd2_transaction_s of size 280 The buggy address is located 120 bytes inside of 280-byte region [ffff888031519d80, ffff888031519e98) The buggy address belongs to the page: page:ffffea0000c54640 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888031519600 pfn:0x31519 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffff888017b8b140 ffff888017b8b140 ffff8881465d5200 raw: ffff888031519600 ffff888031519000 0000000100000009 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Reclaimable, gfp_mask 0x342050(__GFP_IO|__GFP_NOWARN|__GFP_COMP|__GFP_HARDWALL|__GFP_THISNODE|__GFP_RECLAIMABLE), pid 24401, ts 1442067136070, free_ts 1439503341543 prep_new_page mm/page_alloc.c:2434 [inline] get_page_from_freelist+0xa72/0x2f50 mm/page_alloc.c:4165 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5389 __alloc_pages_node include/linux/gfp.h:572 [inline] kmem_getpages mm/slab.c:1378 [inline] cache_grow_begin+0x75/0x390 mm/slab.c:2584 cache_alloc_refill+0x27f/0x380 mm/slab.c:2957 ____cache_alloc mm/slab.c:3040 [inline] ____cache_alloc mm/slab.c:3023 [inline] __do_cache_alloc mm/slab.c:3267 [inline] slab_alloc mm/slab.c:3308 [inline] kmem_cache_alloc+0x450/0x560 mm/slab.c:3499 kmem_cache_zalloc include/linux/slab.h:704 [inline] start_this_handle+0x66e/0x1380 fs/jbd2/transaction.c:375 jbd2__journal_start+0x386/0x6b0 fs/jbd2/transaction.c:525 __ext4_journal_start_sb+0x3a8/0x4a0 fs/ext4/ext4_jbd2.c:105 __ext4_new_inode+0x2d9e/0x56f0 fs/ext4/ialloc.c:1080 ext4_symlink+0x485/0xd40 fs/ext4/namei.c:3293 vfs_symlink fs/namei.c:4299 [inline] vfs_symlink+0x108/0x2c0 fs/namei.c:4284 do_symlinkat+0x261/0x2e0 fs/namei.c:4328 __do_sys_symlink fs/namei.c:4350 [inline] __se_sys_symlink fs/namei.c:4348 [inline] __x64_sys_symlink+0x75/0x90 fs/namei.c:4348 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1352 [inline] free_pcp_prepare+0x374/0x870 mm/page_alloc.c:1404 free_unref_page_prepare mm/page_alloc.c:3325 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3404 slab_destroy mm/slab.c:1630 [inline] slabs_destroy+0x89/0xc0 mm/slab.c:1650 drain_array+0x93/0xa0 mm/slab.c:3969 cache_reap+0x188/0x290 mm/slab.c:4018 process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307 worker_thread+0x657/0x1110 kernel/workqueue.c:2454 kthread+0x2e9/0x3a0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff888031519c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888031519d00: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888031519d80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888031519e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888031519e80: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc 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