================================================================== BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:71 [inline] BUG: KASAN: use-after-free in atomic_long_read include/linux/atomic/atomic-instrumented.h:1183 [inline] BUG: KASAN: use-after-free in __down_read_trylock kernel/locking/rwsem.c:1317 [inline] BUG: KASAN: use-after-free in down_read_trylock+0x7c/0x300 kernel/locking/rwsem.c:1584 Read of size 8 at addr ffff888174560070 by task kworker/u4:0/8 CPU: 1 PID: 8 Comm: kworker/u4:0 Tainted: G W 5.15.106-syzkaller-00249-g19c0ed55a470 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 Workqueue: writeback wb_workfn (flush-7:4) Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106 print_address_description+0x87/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:444 kasan_check_range+0x293/0x2a0 mm/kasan/generic.c:189 __kasan_check_read+0x11/0x20 mm/kasan/shadow.c:31 instrument_atomic_read include/linux/instrumented.h:71 [inline] atomic_long_read include/linux/atomic/atomic-instrumented.h:1183 [inline] __down_read_trylock kernel/locking/rwsem.c:1317 [inline] down_read_trylock+0x7c/0x300 kernel/locking/rwsem.c:1584 trylock_super+0x1f/0xf0 fs/super.c:418 __writeback_inodes_wb+0x101/0x3f0 fs/fs-writeback.c:1967 wb_writeback+0x3cd/0x9e0 fs/fs-writeback.c:2081 wb_check_start_all fs/fs-writeback.c:2203 [inline] wb_do_writeback fs/fs-writeback.c:2229 [inline] wb_workfn+0x8fc/0x1110 fs/fs-writeback.c:2263 process_one_work+0x6bb/0xc10 kernel/workqueue.c:2313 worker_thread+0xad5/0x12a0 kernel/workqueue.c:2460 kthread+0x421/0x510 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Allocated by task 18123: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:433 [inline] ____kasan_kmalloc+0xdb/0x110 mm/kasan/common.c:512 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:227 [inline] kmem_cache_alloc_trace+0x115/0x210 mm/slub.c:3265 kmalloc include/linux/slab.h:608 [inline] kzalloc include/linux/slab.h:738 [inline] alloc_super+0x5d/0x7d0 fs/super.c:203 sget+0x1e5/0x4c0 fs/super.c:624 mount_bdev+0xe6/0x3b0 fs/super.c:1351 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4555 legacy_get_tree+0xf1/0x190 fs/fs_context.c:610 vfs_get_tree+0x88/0x290 fs/super.c:1508 do_new_mount+0x28b/0xac0 fs/namespace.c:2994 path_mount+0x671/0x1070 fs/namespace.c:3324 do_mount fs/namespace.c:3337 [inline] __do_sys_mount fs/namespace.c:3545 [inline] __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3522 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3522 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 1100: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x126/0x160 mm/kasan/common.c:365 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:193 [inline] slab_free_hook mm/slub.c:1723 [inline] slab_free_freelist_hook+0xbd/0x190 mm/slub.c:1749 slab_free mm/slub.c:3517 [inline] kfree+0xc8/0x220 mm/slub.c:4577 destroy_super_work+0x40/0x50 fs/super.c:165 process_one_work+0x6bb/0xc10 kernel/workqueue.c:2313 worker_thread+0xad5/0x12a0 kernel/workqueue.c:2460 kthread+0x421/0x510 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0xf0 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 insert_work+0x56/0x320 kernel/workqueue.c:1369 __queue_work+0x923/0xcd0 kernel/workqueue.c:1535 queue_work_on+0x105/0x170 kernel/workqueue.c:1562 queue_work include/linux/workqueue.h:507 [inline] schedule_work include/linux/workqueue.h:568 [inline] destroy_super_rcu+0xd1/0xe0 fs/super.c:172 rcu_do_batch+0x57a/0xc10 kernel/rcu/tree.c:2509 rcu_core+0x517/0x1020 kernel/rcu/tree.c:2749 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2762 __do_softirq+0x26d/0x5bf kernel/softirq.c:565 Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0xf0 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu kernel/rcu/tree.c:2993 [inline] call_rcu+0x133/0x12a0 kernel/rcu/tree.c:3073 __put_super+0x26d/0x2e0 fs/super.c:299 put_super fs/super.c:313 [inline] deactivate_locked_super+0xe1/0x110 fs/super.c:346 deactivate_super+0xbe/0xf0 fs/super.c:366 cleanup_mnt+0x45c/0x510 fs/namespace.c:1143 __cleanup_mnt+0x19/0x20 fs/namespace.c:1150 task_work_run+0x129/0x190 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0xc4/0xe0 kernel/entry/common.c:175 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x26/0x160 kernel/entry/common.c:301 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff888174560000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 112 bytes inside of 2048-byte region [ffff888174560000, ffff888174560800) The buggy address belongs to the page: page:ffffea0005d15800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x174560 head:ffffea0005d15800 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043200 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 39, ts 765084903100, free_ts 765066028183 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2502 prep_new_page mm/page_alloc.c:2508 [inline] get_page_from_freelist+0x2c14/0x2cf0 mm/page_alloc.c:4291 __alloc_pages+0x386/0x7b0 mm/page_alloc.c:5569 allocate_slab mm/slub.c:1930 [inline] new_slab+0x92/0x490 mm/slub.c:1993 ___slab_alloc+0x39e/0x830 mm/slub.c:3026 __slab_alloc+0x4a/0x90 mm/slub.c:3113 slab_alloc_node mm/slub.c:3204 [inline] slab_alloc mm/slub.c:3246 [inline] __kmalloc_track_caller+0x16c/0x260 mm/slub.c:4943 kmalloc_reserve net/core/skbuff.c:357 [inline] __alloc_skb+0x10c/0x550 net/core/skbuff.c:428 alloc_skb include/linux/skbuff.h:1182 [inline] alloc_skb_with_frags+0xa6/0x680 net/core/skbuff.c:6140 sock_alloc_send_pskb+0x915/0xa50 net/core/sock.c:2503 sock_alloc_send_skb+0x32/0x40 net/core/sock.c:2520 mld_newpack+0x1b4/0xa20 net/ipv6/mcast.c:1748 add_grhead net/ipv6/mcast.c:1851 [inline] add_grec+0xdc8/0x13a0 net/ipv6/mcast.c:1989 mld_send_initial_cr net/ipv6/mcast.c:2236 [inline] mld_dad_work+0x1f8/0x620 net/ipv6/mcast.c:2262 process_one_work+0x6bb/0xc10 kernel/workqueue.c:2313 worker_thread+0xad5/0x12a0 kernel/workqueue.c:2460 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1370 [inline] free_pcp_prepare mm/page_alloc.c:1442 [inline] free_unref_page_prepare+0x7c8/0x7d0 mm/page_alloc.c:3441 free_unref_page+0xac/0x2c0 mm/page_alloc.c:3521 free_the_page mm/page_alloc.c:711 [inline] __free_pages+0x61/0xf0 mm/page_alloc.c:5645 __free_slab+0xec/0x1d0 mm/slub.c:2018 free_slab mm/slub.c:2033 [inline] discard_slab mm/slub.c:2039 [inline] __unfreeze_partials+0x165/0x1a0 mm/slub.c:2525 put_cpu_partial+0xc4/0x120 mm/slub.c:2605 __slab_free+0x1c8/0x290 mm/slub.c:3386 do_slab_free mm/slub.c:3505 [inline] ___cache_free+0x109/0x120 mm/slub.c:3524 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x44/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x15a/0x180 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:443 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:550 slab_alloc_node mm/slub.c:3238 [inline] slab_alloc mm/slub.c:3246 [inline] __kmalloc_track_caller+0x11d/0x260 mm/slub.c:4943 kmemdup+0x24/0x50 mm/util.c:131 neigh_sysctl_register+0xb0/0x530 net/core/neighbour.c:3669 Memory state around the buggy address: ffff88817455ff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88817455ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff888174560000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888174560080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888174560100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================