================================================================== BUG: KASAN: use-after-free in btrfs_sb fs/btrfs/super.h:14 [inline] BUG: KASAN: use-after-free in wait_subpage_spinlock+0x1be/0x210 fs/btrfs/inode.c:8232 Read of size 8 at addr ffff88808dfbc678 by task syz-executor.1/26776 CPU: 1 PID: 26776 Comm: syz-executor.1 Not tainted 6.2.0-rc3-syzkaller-00376-g7c6984405241 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:306 [inline] print_report+0x15e/0x461 mm/kasan/report.c:417 kasan_report+0xbf/0x1f0 mm/kasan/report.c:517 btrfs_sb fs/btrfs/super.h:14 [inline] wait_subpage_spinlock+0x1be/0x210 fs/btrfs/inode.c:8232 __btrfs_release_folio fs/btrfs/inode.c:8261 [inline] btrfs_release_folio+0x109/0x130 fs/btrfs/inode.c:8271 filemap_release_folio+0x13f/0x1b0 mm/filemap.c:3967 shrink_folio_list+0x1ea9/0x3a60 mm/vmscan.c:2000 shrink_inactive_list mm/vmscan.c:2526 [inline] shrink_list mm/vmscan.c:2767 [inline] shrink_lruvec+0xd0e/0x27a0 mm/vmscan.c:5951 shrink_node_memcgs mm/vmscan.c:6138 [inline] shrink_node+0x8f2/0x1f40 mm/vmscan.c:6169 shrink_zones mm/vmscan.c:6407 [inline] do_try_to_free_pages+0x3b4/0x17a0 mm/vmscan.c:6469 try_to_free_mem_cgroup_pages+0x3ae/0xa80 mm/vmscan.c:6786 try_charge_memcg+0x467/0x12f0 mm/memcontrol.c:2687 try_charge mm/memcontrol.c:2830 [inline] mem_cgroup_charge_skmem+0x80/0x1d0 mm/memcontrol.c:7277 sock_reserve_memory net/core/sock.c:1025 [inline] sk_setsockopt+0x203c/0x3b10 net/core/sock.c:1525 __sys_setsockopt+0x500/0x5b0 net/socket.c:2242 __do_sys_setsockopt net/socket.c:2257 [inline] __se_sys_setsockopt net/socket.c:2254 [inline] __x64_sys_setsockopt+0xbe/0x160 net/socket.c:2254 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fc674e8c0c9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc675b06168 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007fc674fabf80 RCX: 00007fc674e8c0c9 RDX: 0000000000000049 RSI: 0000000000000001 RDI: 0000000000000003 RBP: 00007fc674ee7ae9 R08: 0000000000000004 R09: 0000000000000000 R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc4600a13f R14: 00007fc675b06300 R15: 0000000000022000 Allocated by task 10469: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] ____kasan_kmalloc mm/kasan/common.c:330 [inline] __kasan_kmalloc+0xa3/0xb0 mm/kasan/common.c:380 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:968 [inline] __kmalloc_node_track_caller+0x5b/0xc0 mm/slab_common.c:988 kmalloc_reserve net/core/skbuff.c:492 [inline] __alloc_skb+0xe9/0x310 net/core/skbuff.c:565 alloc_skb include/linux/skbuff.h:1270 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:751 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:808 [inline] nsim_dev_trap_report_work+0x2b1/0xc80 drivers/net/netdevsim/dev.c:853 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x669/0x1090 kernel/workqueue.c:2436 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Freed by task 10469: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:518 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x13b/0x1a0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:177 [inline] __cache_free mm/slab.c:3394 [inline] __do_kmem_cache_free mm/slab.c:3580 [inline] __kmem_cache_free+0xcd/0x3b0 mm/slab.c:3587 skb_free_head+0xac/0x110 net/core/skbuff.c:822 skb_release_data+0x5f4/0x870 net/core/skbuff.c:851 skb_release_all net/core/skbuff.c:916 [inline] __kfree_skb net/core/skbuff.c:930 [inline] consume_skb net/core/skbuff.c:1098 [inline] consume_skb+0xcb/0x170 net/core/skbuff.c:1092 nsim_dev_trap_report drivers/net/netdevsim/dev.c:824 [inline] nsim_dev_trap_report_work+0x87c/0xc80 drivers/net/netdevsim/dev.c:853 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x669/0x1090 kernel/workqueue.c:2436 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 The buggy address belongs to the object at ffff88808dfbc000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 1656 bytes inside of 4096-byte region [ffff88808dfbc000, ffff88808dfbd000) The buggy address belongs to the physical page: page:ffffea000237ef00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8dfbc head:ffffea000237ef00 order:1 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888012440900 ffffea0001f30c10 ffffea000209ff90 raw: 0000000000000000 ffff88808dfbc000 0000000100000001 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 0x3c2220(__GFP_HIGH|__GFP_ATOMIC|__GFP_NOWARN|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_THISNODE), pid 10469, tgid 10469 (kworker/0:18), ts 2309121799379, free_ts 2308846044996 prep_new_page mm/page_alloc.c:2531 [inline] get_page_from_freelist+0x119c/0x2ce0 mm/page_alloc.c:4283 __alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5549 __alloc_pages_node include/linux/gfp.h:237 [inline] kmem_getpages mm/slab.c:1363 [inline] cache_grow_begin+0x94/0x390 mm/slab.c:2574 cache_alloc_refill+0x27f/0x380 mm/slab.c:2947 ____cache_alloc mm/slab.c:3023 [inline] ____cache_alloc mm/slab.c:3006 [inline] __do_cache_alloc mm/slab.c:3206 [inline] slab_alloc_node mm/slab.c:3254 [inline] __kmem_cache_alloc_node+0x44f/0x510 mm/slab.c:3544 __do_kmalloc_node mm/slab_common.c:967 [inline] __kmalloc_node_track_caller+0x4b/0xc0 mm/slab_common.c:988 kmalloc_reserve net/core/skbuff.c:492 [inline] __alloc_skb+0xe9/0x310 net/core/skbuff.c:565 alloc_skb include/linux/skbuff.h:1270 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:751 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:808 [inline] nsim_dev_trap_report_work+0x2b1/0xc80 drivers/net/netdevsim/dev.c:853 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x669/0x1090 kernel/workqueue.c:2436 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1446 [inline] free_pcp_prepare+0x65c/0xc00 mm/page_alloc.c:1496 free_unref_page_prepare mm/page_alloc.c:3369 [inline] free_unref_page+0x1d/0x490 mm/page_alloc.c:3464 slab_destroy mm/slab.c:1619 [inline] slabs_destroy+0x85/0xc0 mm/slab.c:1639 cache_flusharray mm/slab.c:3365 [inline] ___cache_free+0x2ac/0x3d0 mm/slab.c:3428 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x4f/0x1a0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x192/0x220 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:302 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:761 [inline] slab_alloc_node mm/slab.c:3261 [inline] slab_alloc mm/slab.c:3270 [inline] __kmem_cache_alloc_lru mm/slab.c:3447 [inline] kmem_cache_alloc+0x225/0x460 mm/slab.c:3456 getname_flags.part.0+0x50/0x4f0 fs/namei.c:139 getname_flags+0x9e/0xe0 include/linux/audit.h:320 user_path_at_empty+0x2f/0x60 fs/namei.c:2875 user_path_at include/linux/namei.h:57 [inline] ksys_umount fs/namespace.c:1927 [inline] __do_sys_umount fs/namespace.c:1935 [inline] __se_sys_umount fs/namespace.c:1933 [inline] __x64_sys_umount+0xfc/0x190 fs/namespace.c:1933 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff88808dfbc500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808dfbc580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88808dfbc600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88808dfbc680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808dfbc700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================