================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x3d9c/0x54d0 kernel/locking/lockdep.c:4897 Read of size 8 at addr ffff8880735610f8 by task syz-executor.4/4219 CPU: 0 PID: 4219 Comm: syz-executor.4 Not tainted 5.17.0-rc2-next-20220204-syzkaller #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+0xa5/0x3e0 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+0x3d9c/0x54d0 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:354 [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+0x1fbb/0x5d10 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: 0033:0x7f7360f4c059 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:00007f735fec1168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f736105ef60 RCX: 00007f7360f4c059 RDX: 0000000020000040 RSI: 000000004004662b RDI: 0000000000000006 RBP: 00007f7360fa608d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd92100def R14: 00007f735fec1300 R15: 0000000000022000 Allocated by task 3629: 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+0x90/0xc0 mm/kasan/common.c:469 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slab.h:732 [inline] slab_alloc_node mm/slub.c:3230 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc+0x202/0x3a0 mm/slub.c:3243 kmem_cache_zalloc include/linux/slab.h:705 [inline] start_this_handle+0x66e/0x1380 fs/jbd2/transaction.c:375 jbd2__journal_start+0x399/0x930 fs/jbd2/transaction.c:525 __ext4_journal_start_sb+0x227/0x4a0 fs/ext4/ext4_jbd2.c:105 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_unlink+0x2f4/0x9e0 fs/ext4/namei.c:3224 vfs_unlink+0x351/0x920 fs/namei.c:4150 do_unlinkat+0x3c9/0x650 fs/namei.c:4218 __do_sys_unlink fs/namei.c:4266 [inline] __se_sys_unlink fs/namei.c:4264 [inline] __x64_sys_unlink+0xc6/0x110 fs/namei.c:4264 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 4220: 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+0x166/0x1a0 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:226 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1754 slab_free mm/slub.c:3509 [inline] kmem_cache_free+0xdb/0x3b0 mm/slub.c:3526 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+0x200e/0x5d10 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 ffff888073561080 which belongs to the cache jbd2_transaction_s of size 280 The buggy address is located 120 bytes inside of 280-byte region [ffff888073561080, ffff888073561198) The buggy address belongs to the page: page:ffffea0001cd5800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x73560 head:ffffea0001cd5800 order:1 compound_mapcount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000001 ffff88801794adc0 raw: 0000000000000000 0000000080150015 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Reclaimable, gfp_mask 0x1d2050(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 3627, ts 953778916228, free_ts 860390198210 prep_new_page mm/page_alloc.c:2489 [inline] get_page_from_freelist+0x13ea/0x31d0 mm/page_alloc.c:4219 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5435 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2268 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab mm/slub.c:1944 [inline] new_slab+0x295/0x400 mm/slub.c:2004 ___slab_alloc+0x7ed/0xe00 mm/slub.c:3018 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3105 slab_alloc_node mm/slub.c:3196 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc+0x35c/0x3a0 mm/slub.c:3243 kmem_cache_zalloc include/linux/slab.h:705 [inline] start_this_handle+0x66e/0x1380 fs/jbd2/transaction.c:375 jbd2__journal_start+0x399/0x930 fs/jbd2/transaction.c:525 __ext4_journal_start_sb+0x227/0x4a0 fs/ext4/ext4_jbd2.c:105 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_unlink+0x2f4/0x9e0 fs/ext4/namei.c:3224 vfs_unlink+0x351/0x920 fs/namei.c:4150 do_unlinkat+0x3c9/0x650 fs/namei.c:4218 __do_sys_unlink fs/namei.c:4266 [inline] __se_sys_unlink fs/namei.c:4264 [inline] __x64_sys_unlink+0xc6/0x110 fs/namei.c:4264 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:1356 [inline] free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1406 free_unref_page_prepare mm/page_alloc.c:3376 [inline] free_unref_page+0x19/0x6c0 mm/page_alloc.c:3455 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2536 qlink_free mm/kasan/quarantine.c:157 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slab.h:732 [inline] slab_alloc_node mm/slub.c:3230 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc+0x202/0x3a0 mm/slub.c:3243 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138 getname_flags+0x9a/0xe0 include/linux/audit.h:323 user_path_at_empty+0x2b/0x60 fs/namei.c:2850 user_path_at include/linux/namei.h:57 [inline] ksys_umount fs/namespace.c:1795 [inline] __do_sys_umount fs/namespace.c:1803 [inline] __se_sys_umount fs/namespace.c:1801 [inline] __x64_sys_umount+0xf8/0x180 fs/namespace.c:1801 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 Memory state around the buggy address: ffff888073560f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888073561000: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888073561080: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888073561100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888073561180: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================