================================================================== BUG: KASAN: slab-out-of-bounds in __bfs+0x154/0x394 kernel/locking/lockdep.c:1708 Read of size 8 at addr ffffaf800e79ff30 by task syz-executor.1/2040 CPU: 1 PID: 2040 Comm: syz-executor.1 Not tainted 5.17.0-rc1-syzkaller-00002-g0966d385830d #0 Hardware name: riscv-virtio,qemu (DT) Call Trace: [] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:113 [] show_stack+0x34/0x40 arch/riscv/kernel/stacktrace.c:119 [] __dump_stack lib/dump_stack.c:88 [inline] [] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:106 [] print_address_description.constprop.0+0x2a/0x330 mm/kasan/report.c:255 [] __kasan_report mm/kasan/report.c:442 [inline] [] kasan_report+0x184/0x1e0 mm/kasan/report.c:459 [] check_region_inline mm/kasan/generic.c:183 [inline] [] __asan_load8+0x6e/0x96 mm/kasan/generic.c:256 [] __bfs+0x154/0x394 kernel/locking/lockdep.c:1708 [] __bfs_forwards kernel/locking/lockdep.c:1803 [inline] [] check_path.constprop.0+0x24/0x46 kernel/locking/lockdep.c:2104 [] check_noncircular+0x11a/0x1fe kernel/locking/lockdep.c:2131 Allocated by task 1102416563: (stack is not available) Freed by task 2279: stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122 kasan_save_stack+0x2c/0x58 mm/kasan/common.c:38 kasan_set_track+0x1a/0x26 mm/kasan/common.c:45 kasan_set_free_info+0x1e/0x3a mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x15e/0x180 mm/kasan/common.c:328 __kasan_slab_free+0x10/0x18 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:236 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x8e/0x1cc mm/slub.c:1754 slab_free mm/slub.c:3509 [inline] kfree+0xe0/0x3e4 mm/slub.c:4562 skb_free_head net/core/skbuff.c:655 [inline] skb_release_data+0x3c2/0x3c4 net/core/skbuff.c:677 skb_release_all net/core/skbuff.c:742 [inline] __kfree_skb net/core/skbuff.c:756 [inline] consume_skb net/core/skbuff.c:914 [inline] consume_skb+0x96/0x136 net/core/skbuff.c:908 nsim_dev_trap_report drivers/net/netdevsim/dev.c:818 [inline] nsim_dev_trap_report_work+0x524/0x5e4 drivers/net/netdevsim/dev.c:843 process_one_work+0x654/0xffe kernel/workqueue.c:2307 worker_thread+0x360/0x8fa kernel/workqueue.c:2454 kthread+0x19e/0x1fa kernel/kthread.c:377 ret_from_exception+0x0/0x10 Last potentially related work creation: ------------[ cut here ]------------ slab index 1700064 out of bounds (318) for stack id 0e79f0e0 WARNING: CPU: 1 PID: 2040 at lib/stackdepot.c:304 stack_depot_fetch lib/stackdepot.c:304 [inline] WARNING: CPU: 1 PID: 2040 at lib/stackdepot.c:304 stack_depot_print+0x66/0x70 lib/stackdepot.c:276 Modules linked in: CPU: 1 PID: 2040 Comm: syz-executor.1 Not tainted 5.17.0-rc1-syzkaller-00002-g0966d385830d #0 Hardware name: riscv-virtio,qemu (DT) epc : stack_depot_fetch lib/stackdepot.c:304 [inline] epc : stack_depot_print+0x66/0x70 lib/stackdepot.c:276 ra : stack_depot_fetch lib/stackdepot.c:304 [inline] ra : stack_depot_print+0x66/0x70 lib/stackdepot.c:276 epc : ffffffff80c00b8a ra : ffffffff80c00b8a sp : ffffaf800e79fcc0 gp : ffffffff85863ac0 tp : ffffaf800ecf6100 t0 : ffffffff86bcb657 t1 : fffff5ef0b53c90c t2 : 0000000000000000 s0 : ffffaf800e79fcd0 s1 : ffffaf807aa5b2c0 a0 : 000000000000003c a1 : 00000000000f0000 a2 : 0000000000000502 a3 : ffffffff8012252a a4 : efd34f3ccc8ce800 a5 : efd34f3ccc8ce800 a6 : 0000000000f00000 a7 : ffffaf805a9e4863 s2 : ffffaf800e79ff30 s3 : ffffaf8007202140 s4 : ffffaf800e79e000 s5 : ffffaf800e79f000 s6 : ffffffff8588bb20 s7 : ffffffff85e09180 s8 : ffffaf800e79fe40 s9 : ffffaf800ecf6c08 s10: ffffffff85899680 s11: ffffaf800ecf6100 t3 : ffffffff801163b2 t4 : fffff5ef0b53c90c t5 : fffff5ef0b53c90d t6 : ffffaf800e79f7b8 status: 0000000000000100 badaddr: 0000000000000000 cause: 0000000000000003 [] describe_object_stacks mm/kasan/report.c:216 [inline] [] describe_object mm/kasan/report.c:231 [inline] [] print_address_description.constprop.0+0x2fc/0x330 mm/kasan/report.c:263 [] __kasan_report mm/kasan/report.c:442 [inline] [] kasan_report+0x184/0x1e0 mm/kasan/report.c:459 [] check_region_inline mm/kasan/generic.c:183 [inline] [] __asan_load8+0x6e/0x96 mm/kasan/generic.c:256 [] __bfs+0x154/0x394 kernel/locking/lockdep.c:1708 [] __bfs_forwards kernel/locking/lockdep.c:1803 [inline] [] check_path.constprop.0+0x24/0x46 kernel/locking/lockdep.c:2104 [] check_noncircular+0x11a/0x1fe kernel/locking/lockdep.c:2131 irq event stamp: 157705 hardirqs last enabled at (157704): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (157704): [] _raw_spin_unlock_irqrestore+0x68/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (157705): [] rmqueue_pcplist mm/page_alloc.c:3660 [inline] hardirqs last disabled at (157705): [] rmqueue mm/page_alloc.c:3698 [inline] hardirqs last disabled at (157705): [] get_page_from_freelist+0xfbe/0x12d8 mm/page_alloc.c:4162 softirqs last enabled at (157660): [] spin_unlock_bh include/linux/spinlock.h:394 [inline] softirqs last enabled at (157660): [] igmpv3_del_delrec+0x2b2/0x3fa net/ipv4/igmp.c:1247 softirqs last disabled at (157675): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (157675): [] invoke_softirq kernel/softirq.c:439 [inline] softirqs last disabled at (157675): [] __irq_exit_rcu+0x142/0x1f8 kernel/softirq.c:637 ---[ end trace 0000000000000000 ]--- The buggy address belongs to the object at ffffaf800e79e000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 3888 bytes to the right of 4096-byte region [ffffaf800e79e000, ffffaf800e79f000) The buggy address belongs to the page: page:ffffaf807aa5b2c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8e998 head:ffffaf807aa5b2c0 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x8800010200(slab|head|section=17|node=0|zone=0) raw: 0000008800010200 0000000000000100 0000000000000122 ffffaf8007202140 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 raw: 00000000000007ff page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 2038, ts 688607572700, free_ts 686071314000 __set_page_owner+0x48/0x136 mm/page_owner.c:183 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0xd0/0x10a mm/page_alloc.c:2427 prep_new_page mm/page_alloc.c:2434 [inline] get_page_from_freelist+0x8da/0x12d8 mm/page_alloc.c:4165 __alloc_pages+0x150/0x3b6 mm/page_alloc.c:5389 alloc_pages+0x132/0x2a6 mm/mempolicy.c:2271 alloc_slab_page.constprop.0+0xc2/0xfa mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x25a/0x2cc mm/slub.c:2004 ___slab_alloc+0x56e/0x918 mm/slub.c:3018 __slab_alloc.constprop.0+0x50/0x8c mm/slub.c:3105 slab_alloc_node mm/slub.c:3196 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc_trace+0x2a2/0x2e0 mm/slub.c:3255 kmalloc include/linux/slab.h:581 [inline] kzalloc include/linux/slab.h:715 [inline] snmp6_alloc_dev net/ipv6/addrconf.c:360 [inline] ipv6_add_dev+0x3d6/0xa7e net/ipv6/addrconf.c:410 addrconf_notify+0x5e8/0x1360 net/ipv6/addrconf.c:3510 notifier_call_chain+0xb8/0x188 kernel/notifier.c:84 raw_notifier_call_chain+0x2a/0x38 kernel/notifier.c:392 call_netdevice_notifiers_info+0x9e/0x10c net/core/dev.c:1919 call_netdevice_notifiers_extack net/core/dev.c:1931 [inline] call_netdevice_notifiers net/core/dev.c:1945 [inline] register_netdevice+0xae8/0xc6a net/core/dev.c:9698 page last free stack trace: __reset_page_owner+0x4a/0xea mm/page_owner.c:142 reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1352 [inline] free_pcp_prepare+0x29c/0x45e mm/page_alloc.c:1404 free_unref_page_prepare mm/page_alloc.c:3325 [inline] free_unref_page+0x6a/0x31e mm/page_alloc.c:3404 free_the_page mm/page_alloc.c:706 [inline] __free_pages+0xe2/0x112 mm/page_alloc.c:5474 __free_slab+0x122/0x27c mm/slub.c:2028 free_slab mm/slub.c:2043 [inline] discard_slab+0x4c/0x7a mm/slub.c:2049 __slab_free+0x20a/0x29c mm/slub.c:3414 do_slab_free mm/slub.c:3497 [inline] ___cache_free+0x17c/0x354 mm/slub.c:3516 qlink_free mm/kasan/quarantine.c:157 [inline] qlist_free_all+0x7c/0x132 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14c/0x1c8 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x5c/0x98 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:260 [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+0x338/0x3de mm/slub.c:3243 vm_area_dup+0xa4/0x224 kernel/fork.c:357 __split_vma+0x7c/0x2fa mm/mmap.c:2720 split_vma+0x68/0x8c mm/mmap.c:2778 mprotect_fixup+0x358/0x3dc mm/mprotect.c:483 Memory state around the buggy address: ffffaf800e79fe00: 00 f3 f3 f3 fc fc fc fc fc fc fc fc fc fc fc fc ffffaf800e79fe80: fc fc fc fc fc fc fc fc 00 00 00 00 f1 f1 f1 f1 >ffffaf800e79ff00: 00 f2 f2 f2 fc fc fc fc 00 00 00 f3 f3 f3 f3 f3 ^ ffffaf800e79ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffffaf800e7a0000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================