================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:96 [inline] BUG: KASAN: slab-use-after-free in test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:71 [inline] BUG: KASAN: slab-use-after-free in __fscache_relinquish_cookie+0x2c/0x580 fs/netfs/fscache_cookie.c:977 Write of size 8 at addr ffff888089db40f0 by task syz-executor.2/3153 CPU: 1 PID: 3153 Comm: syz-executor.2 Not tainted 6.8.0-rc4-next-20240214-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:71 [inline] __fscache_relinquish_cookie+0x2c/0x580 fs/netfs/fscache_cookie.c:977 fscache_relinquish_cookie include/linux/fscache.h:308 [inline] v9fs_evict_inode+0x100/0x180 fs/9p/vfs_inode.c:356 evict+0x2a8/0x630 fs/inode.c:666 v9fs_fid_iget_dotl+0x1bf/0x210 fs/9p/vfs_inode_dotl.c:96 v9fs_get_inode_from_fid fs/9p/v9fs.h:230 [inline] v9fs_mount+0x7f9/0xa90 fs/9p/vfs_super.c:142 legacy_get_tree+0xee/0x190 fs/fs_context.c:662 vfs_get_tree+0x90/0x2a0 fs/super.c:1784 do_new_mount+0x2be/0xb40 fs/namespace.c:3352 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7f533f07dda9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f533feb60c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f533f1abf80 RCX: 00007f533f07dda9 RDX: 0000000020000b80 RSI: 0000000020000040 RDI: 0000000000000000 RBP: 00007f533f0ca47a R08: 0000000020000580 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f533f1abf80 R15: 00007fffb8693cc8 Allocated by task 6804: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3814 [inline] slab_alloc_node mm/slub.c:3861 [inline] kmem_cache_alloc+0x172/0x350 mm/slub.c:3868 kmem_cache_zalloc include/linux/slab.h:701 [inline] fscache_alloc_cookie fs/netfs/fscache_cookie.c:335 [inline] __fscache_acquire_cookie+0x125/0x16d0 fs/netfs/fscache_cookie.c:470 fscache_acquire_cookie include/linux/fscache.h:253 [inline] v9fs_cache_inode_get_cookie+0x22d/0x380 fs/9p/cache.c:66 v9fs_fid_iget+0x345/0x3b0 fs/9p/vfs_inode.c:395 v9fs_get_inode_from_fid fs/9p/v9fs.h:232 [inline] v9fs_mount+0x7e7/0xa90 fs/9p/vfs_super.c:142 legacy_get_tree+0xee/0x190 fs/fs_context.c:662 vfs_get_tree+0x90/0x2a0 fs/super.c:1784 do_new_mount+0x2be/0xb40 fs/namespace.c:3352 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Freed by task 6804: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:586 poison_slab_object+0xa6/0xe0 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2122 [inline] slab_free mm/slub.c:4296 [inline] kmem_cache_free+0x102/0x2a0 mm/slub.c:4360 fscache_put_cookie+0x97/0x110 fs/netfs/fscache_cookie.c:1014 fscache_relinquish_cookie include/linux/fscache.h:308 [inline] v9fs_evict_inode+0x100/0x180 fs/9p/vfs_inode.c:356 evict+0x2a8/0x630 fs/inode.c:666 dispose_list fs/inode.c:699 [inline] evict_inodes+0x5f9/0x690 fs/inode.c:749 generic_shutdown_super+0x9d/0x2d0 fs/super.c:631 kill_anon_super+0x3b/0x70 fs/super.c:1230 v9fs_kill_super+0x4c/0x90 fs/9p/vfs_super.c:193 deactivate_locked_super+0xc4/0x130 fs/super.c:477 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1267 task_work_run+0x24f/0x310 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:108 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline] syscall_exit_to_user_mode+0x168/0x370 kernel/entry/common.c:212 do_syscall_64+0x10a/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x6d/0x75 The buggy address belongs to the object at ffff888089db4000 which belongs to the cache fscache_cookie_jar of size 280 The buggy address is located 240 bytes inside of freed 280-byte region [ffff888089db4000, ffff888089db4118) The buggy address belongs to the physical page: page:ffffea0002276d00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888089db4158 pfn:0x89db4 head:ffffea0002276d00 order:1 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff80000000840(slab|head|node=0|zone=1|lastcpupid=0xfff) page_type: 0xffffffff() raw: 00fff80000000840 ffff88801a68edc0 dead000000000122 0000000000000000 raw: ffff888089db4158 0000000080170016 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 6804, tgid 6802 (syz-executor.2), ts 1690541601186, free_ts 1690443365149 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311 __alloc_pages+0x256/0x6a0 mm/page_alloc.c:4567 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page+0x5f/0x160 mm/slub.c:2191 allocate_slab mm/slub.c:2354 [inline] new_slab+0x84/0x2f0 mm/slub.c:2407 ___slab_alloc+0xc73/0x1260 mm/slub.c:3541 __slab_alloc mm/slub.c:3626 [inline] __slab_alloc_node mm/slub.c:3679 [inline] slab_alloc_node mm/slub.c:3851 [inline] kmem_cache_alloc+0x250/0x350 mm/slub.c:3868 kmem_cache_zalloc include/linux/slab.h:701 [inline] fscache_alloc_cookie fs/netfs/fscache_cookie.c:335 [inline] __fscache_acquire_cookie+0x125/0x16d0 fs/netfs/fscache_cookie.c:470 fscache_acquire_cookie include/linux/fscache.h:253 [inline] v9fs_cache_inode_get_cookie+0x22d/0x380 fs/9p/cache.c:66 v9fs_fid_iget+0x345/0x3b0 fs/9p/vfs_inode.c:395 v9fs_get_inode_from_fid fs/9p/v9fs.h:232 [inline] v9fs_mount+0x7e7/0xa90 fs/9p/vfs_super.c:142 legacy_get_tree+0xee/0x190 fs/fs_context.c:662 vfs_get_tree+0x90/0x2a0 fs/super.c:1784 do_new_mount+0x2be/0xb40 fs/namespace.c:3352 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875 do_syscall_64+0xfb/0x240 page last free pid 6793 tgid 6790 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x968/0xa90 mm/page_alloc.c:2346 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2486 mm_free_pgd kernel/fork.c:802 [inline] __mmdrop+0xb9/0x3d0 kernel/fork.c:918 exit_mm+0x220/0x310 kernel/exit.c:569 do_exit+0x99e/0x27e0 kernel/exit.c:865 do_group_exit+0x207/0x2c0 kernel/exit.c:1027 get_signal+0x176e/0x1850 kernel/signal.c:2907 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:105 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline] syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:212 do_syscall_64+0x10a/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Memory state around the buggy address: ffff888089db3f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888089db4000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888089db4080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888089db4100: fb fb fb fc fc fc fc fc fc fc fc fa fb fb fb fb ffff888089db4180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================