================================================================== BUG: KASAN: double-free or invalid-free in slab_free mm/slub.c:3157 [inline] BUG: KASAN: double-free or invalid-free in kfree+0xe5/0x5c0 mm/slub.c:4156 CPU: 1 PID: 17094 Comm: kworker/u4:8 Not tainted 5.10.0-next-20201223-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_tt_purge Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:230 kasan_report_invalid_free+0x51/0x80 mm/kasan/report.c:355 ____kasan_slab_free.part.0+0xfd/0x110 mm/kasan/common.c:344 kasan_slab_free include/linux/kasan.h:188 [inline] slab_free_hook mm/slub.c:1548 [inline] slab_free_freelist_hook+0x82/0x1d0 mm/slub.c:1586 slab_free mm/slub.c:3157 [inline] kfree+0xe5/0x5c0 mm/slub.c:4156 bdev_free_inode+0x57/0x80 fs/block_dev.c:787 i_callback+0x3f/0x70 fs/inode.c:222 rcu_do_batch kernel/rcu/tree.c:2489 [inline] rcu_core+0x5eb/0xf00 kernel/rcu/tree.c:2723 __do_softirq+0x2a5/0x9f7 kernel/softirq.c:343 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:226 [inline] __irq_exit_rcu kernel/softirq.c:420 [inline] irq_exit_rcu+0x134/0x200 kernel/softirq.c:432 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:__local_bh_enable_ip+0xa4/0x110 kernel/softirq.c:203 Code: e8 21 fe 08 00 65 8b 05 ba a3 bd 7e a9 00 ff ff 00 74 45 bf 01 00 00 00 e8 09 fe 08 00 e8 f4 ff 33 00 fb 65 8b 05 9c a3 bd 7e <85> c0 74 4a 5b 5d c3 65 8b 05 0a b2 bd 7e 85 c0 75 a6 0f 0b eb a2 RSP: 0018:ffffc900023ffc90 EFLAGS: 00000202 RAX: 0000000080000000 RBX: 0000000000000201 RCX: ffffffff815811c7 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffffff889905f3 R08: 0000000000000001 R09: ffffffff8ebe1887 R10: fffffbfff1d7c310 R11: 0000000000000000 R12: ffffc900023ffda8 R13: dffffc0000000000 R14: ffff88801c4ed600 R15: 000000000000020c spin_unlock_bh include/linux/spinlock.h:399 [inline] batadv_tt_global_purge net/batman-adv/translation-table.c:2319 [inline] batadv_tt_purge+0x3a3/0xaf0 net/batman-adv/translation-table.c:3590 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Allocated by task 25: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:404 [inline] ____kasan_kmalloc mm/kasan/common.c:435 [inline] ____kasan_kmalloc.constprop.0+0xa0/0xd0 mm/kasan/common.c:407 kmalloc include/linux/slab.h:557 [inline] kzalloc include/linux/slab.h:682 [inline] batadv_tvlv_container_register+0x4c/0x400 net/batman-adv/tvlv.c:234 batadv_tt_tvlv_container_update+0x1d8/0x780 net/batman-adv/translation-table.c:1059 batadv_tt_local_commit_changes_nolock+0x949/0xd90 net/batman-adv/translation-table.c:3736 batadv_tt_local_commit_changes+0x22/0x30 net/batman-adv/translation-table.c:3747 batadv_iv_ogm_schedule_buff+0x117e/0x1410 net/batman-adv/bat_iv_ogm.c:811 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:869 [inline] batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:862 [inline] batadv_iv_send_outstanding_bat_ogm_packet+0x5c8/0x800 net/batman-adv/bat_iv_ogm.c:1723 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Freed by task 17094: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:355 ____kasan_slab_free.part.0+0xe1/0x110 mm/kasan/common.c:365 kasan_slab_free include/linux/kasan.h:188 [inline] slab_free_hook mm/slub.c:1548 [inline] slab_free_freelist_hook+0x82/0x1d0 mm/slub.c:1586 slab_free mm/slub.c:3157 [inline] kfree+0xe5/0x5c0 mm/slub.c:4156 batadv_tvlv_container_release net/batman-adv/tvlv.c:99 [inline] kref_put include/linux/kref.h:65 [inline] batadv_tvlv_container_put net/batman-adv/tvlv.c:109 [inline] batadv_tvlv_container_remove+0x20b/0x2a0 net/batman-adv/tvlv.c:192 batadv_tvlv_container_register+0x1c0/0x400 net/batman-adv/tvlv.c:248 batadv_tt_tvlv_container_update+0x1d8/0x780 net/batman-adv/translation-table.c:1059 batadv_tt_local_commit_changes_nolock+0xc50/0xd90 net/batman-adv/translation-table.c:3719 batadv_tt_local_commit_changes+0x22/0x30 net/batman-adv/translation-table.c:3747 batadv_iv_ogm_schedule_buff+0x117e/0x1410 net/batman-adv/bat_iv_ogm.c:811 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:869 [inline] batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:862 [inline] batadv_iv_send_outstanding_bat_ogm_packet+0x5c8/0x800 net/batman-adv/bat_iv_ogm.c:1723 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 The buggy address belongs to the object at ffff8880292e4a00 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 0 bytes inside of 128-byte region [ffff8880292e4a00, ffff8880292e4a80) The buggy address belongs to the page: page:00000000236d70bc refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x292e4 flags: 0xfff00000000200(slab) raw: 00fff00000000200 dead000000000100 dead000000000122 ffff888010041640 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880292e4900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880292e4980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880292e4a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880292e4a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880292e4b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================