Hello, syzbot found the following issue on: HEAD commit: 2faac9a98f01 Merge tag 'keys-fixes-20230321' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1207516ac80000 kernel config: https://syzkaller.appspot.com/x/.config?x=aaa4b45720ca0519 dashboard link: https://syzkaller.appspot.com/bug?extid=b08ebcc22f8f3e6be43a compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b08ebcc22f8f3e6be43a@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: slab-use-after-free in __lock_acquire+0x405b/0x5d40 kernel/locking/lockdep.c:4926 Read of size 8 at addr ffff888019c16258 by task segctord/11135 CPU: 1 PID: 11135 Comm: segctord Not tainted 6.3.0-rc3-syzkaller-00016-g2faac9a98f01 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:319 print_report mm/kasan/report.c:430 [inline] kasan_report+0x11c/0x130 mm/kasan/report.c:536 __lock_acquire+0x405b/0x5d40 kernel/locking/lockdep.c:4926 lock_acquire kernel/locking/lockdep.c:5669 [inline] lock_acquire+0x1af/0x520 kernel/locking/lockdep.c:5634 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3d/0x60 kernel/locking/spinlock.c:162 __wake_up_common_lock+0xb8/0x140 kernel/sched/wait.c:137 nilfs_segctor_thread+0x6d0/0xf30 fs/nilfs2/segment.c:2616 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 </TASK> Allocated by task 11132: 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:374 [inline] ____kasan_kmalloc mm/kasan/common.c:333 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:580 [inline] kzalloc include/linux/slab.h:720 [inline] nilfs_segctor_new fs/nilfs2/segment.c:2659 [inline] nilfs_attach_log_writer+0x15a/0xa50 fs/nilfs2/segment.c:2789 nilfs_fill_super fs/nilfs2/super.c:1082 [inline] nilfs_mount+0xc35/0x1150 fs/nilfs2/super.c:1324 legacy_get_tree+0x109/0x220 fs/fs_context.c:610 vfs_get_tree+0x8d/0x350 fs/super.c:1510 do_new_mount fs/namespace.c:3042 [inline] path_mount+0x1342/0x1e40 fs/namespace.c:3372 do_mount fs/namespace.c:3385 [inline] __do_sys_mount fs/namespace.c:3594 [inline] __se_sys_mount fs/namespace.c:3571 [inline] __ia32_sys_mount+0x282/0x300 fs/namespace.c:3571 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 Freed by task 5177: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:521 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807 slab_free mm/slub.c:3787 [inline] __kmem_cache_free+0xaf/0x2d0 mm/slub.c:3800 nilfs_segctor_destroy fs/nilfs2/segment.c:2758 [inline] nilfs_detach_log_writer+0x59b/0x9f0 fs/nilfs2/segment.c:2816 nilfs_put_super+0x43/0x1b0 fs/nilfs2/super.c:477 generic_shutdown_super+0x158/0x480 fs/super.c:500 kill_block_super+0x9b/0xf0 fs/super.c:1407 deactivate_locked_super+0x98/0x160 fs/super.c:331 deactivate_super+0xb1/0xd0 fs/super.c:362 cleanup_mnt+0x2ae/0x3d0 fs/namespace.c:1177 task_work_run+0x16f/0x270 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296 __do_fast_syscall_32+0x72/0xf0 arch/x86/entry/common.c:181 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 Last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:491 kvfree_call_rcu+0x70/0xad0 kernel/rcu/tree.c:3316 neigh_destroy+0x433/0x660 net/core/neighbour.c:941 neigh_release include/net/neighbour.h:449 [inline] neigh_cleanup_and_release+0x1f8/0x280 net/core/neighbour.c:103 neigh_flush_dev+0x4cb/0x890 net/core/neighbour.c:421 __neigh_ifdown.isra.0+0x54/0x400 net/core/neighbour.c:438 neigh_ifdown+0x1f/0x30 net/core/neighbour.c:456 rt6_disable_ip+0x14d/0x9e0 net/ipv6/route.c:4894 addrconf_ifdown.isra.0+0x11a/0x1940 net/ipv6/addrconf.c:3755 addrconf_notify+0x106/0x19f0 net/ipv6/addrconf.c:3678 notifier_call_chain+0xb5/0x200 kernel/notifier.c:87 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1937 call_netdevice_notifiers_extack net/core/dev.c:1975 [inline] call_netdevice_notifiers net/core/dev.c:1989 [inline] dev_close_many+0x309/0x630 net/core/dev.c:1530 unregister_netdevice_many_notify+0x414/0x1910 net/core/dev.c:10816 unregister_netdevice_many net/core/dev.c:10899 [inline] default_device_exit_batch+0x451/0x5b0 net/core/dev.c:11352 ops_exit_list+0x125/0x170 net/core/net_namespace.c:174 cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:613 process_one_work+0x991/0x15c0 kernel/workqueue.c:2390 worker_thread+0x669/0x1090 kernel/workqueue.c:2537 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Second to last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:491 __call_rcu_common.constprop.0+0x99/0x7e0 kernel/rcu/tree.c:2622 pwq_unbound_release_workfn+0x26b/0x340 kernel/workqueue.c:3849 process_one_work+0x991/0x15c0 kernel/workqueue.c:2390 worker_thread+0x669/0x1090 kernel/workqueue.c:2537 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 ffff888019c16000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 600 bytes inside of freed 1024-byte region [ffff888019c16000, ffff888019c16400) The buggy address belongs to the physical page: page:ffffea0000670400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x19c10 head:ffffea0000670400 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888012442dc0 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000100010 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 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5215, tgid 5215 (kworker/3:3), ts 201052079376, free_ts 61109797375 prep_new_page mm/page_alloc.c:2552 [inline] get_page_from_freelist+0x1190/0x2e20 mm/page_alloc.c:4325 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:5591 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2283 alloc_slab_page mm/slub.c:1851 [inline] allocate_slab+0x25f/0x390 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3193 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3292 __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] __kmem_cache_alloc_node+0x136/0x320 mm/slub.c:3491 __do_kmalloc_node mm/slab_common.c:966 [inline] __kmalloc_node_track_caller+0x4f/0x1a0 mm/slab_common.c:987 kmalloc_reserve+0xf0/0x270 net/core/skbuff.c:537 __alloc_skb+0x129/0x330 net/core/skbuff.c:606 alloc_skb include/linux/skbuff.h:1277 [inline] nlmsg_new include/net/netlink.h:1003 [inline] inet6_rt_notify+0xf0/0x2b0 net/ipv6/route.c:6166 fib6_add_rt2node net/ipv6/ip6_fib.c:1251 [inline] fib6_add+0x200d/0x4080 net/ipv6/ip6_fib.c:1477 __ip6_ins_rt net/ipv6/route.c:1302 [inline] ip6_ins_rt+0xb6/0x110 net/ipv6/route.c:1312 __ipv6_ifa_notify+0x8fe/0xb90 net/ipv6/addrconf.c:6162 ipv6_ifa_notify net/ipv6/addrconf.c:6201 [inline] addrconf_dad_completed+0x133/0xda0 net/ipv6/addrconf.c:4214 addrconf_dad_begin net/ipv6/addrconf.c:4019 [inline] addrconf_dad_work+0x820/0x1390 net/ipv6/addrconf.c:4121 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1453 [inline] free_pcp_prepare+0x5d5/0xa50 mm/page_alloc.c:1503 free_unref_page_prepare mm/page_alloc.c:3387 [inline] free_unref_page+0x1d/0x490 mm/page_alloc.c:3482 __folio_put_small mm/swap.c:106 [inline] __folio_put+0xc5/0x140 mm/swap.c:129 folio_put include/linux/mm.h:1309 [inline] put_page include/linux/mm.h:1378 [inline] anon_pipe_buf_release+0x3fb/0x4c0 fs/pipe.c:138 pipe_buf_release include/linux/pipe_fs_i.h:203 [inline] pipe_read+0x614/0x1110 fs/pipe.c:324 call_read_iter include/linux/fs.h:1845 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x7fa/0x930 fs/read_write.c:470 ksys_read+0x1ec/0x250 fs/read_write.c:613 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: ffff888019c16100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888019c16180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888019c16200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888019c16280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888019c16300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This report is generated by a bot. 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