================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read include/linux/instrumented.h:68 [inline] BUG: KASAN: slab-use-after-free in atomic_long_read include/linux/atomic/atomic-instrumented.h:3188 [inline] BUG: KASAN: slab-use-after-free in __mutex_unlock_slowpath+0xef/0x750 kernel/locking/mutex.c:921 Read of size 8 at addr ffff88802d6d4880 by task vhost-13421/13422 CPU: 1 PID: 13422 Comm: vhost-13421 Not tainted 6.9.0-rc6-next-20240501-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 instrument_atomic_read include/linux/instrumented.h:68 [inline] atomic_long_read include/linux/atomic/atomic-instrumented.h:3188 [inline] __mutex_unlock_slowpath+0xef/0x750 kernel/locking/mutex.c:921 vhost_task_fn+0x3bc/0x3f0 kernel/vhost_task.c:65 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 13421: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace_noprof+0x19c/0x2b0 mm/slub.c:4146 kmalloc_noprof include/linux/slab.h:660 [inline] kzalloc_noprof include/linux/slab.h:778 [inline] vhost_task_create+0x149/0x300 kernel/vhost_task.c:134 vhost_worker_create+0x17b/0x3f0 drivers/vhost/vhost.c:667 vhost_dev_set_owner+0x563/0x940 drivers/vhost/vhost.c:945 vhost_dev_ioctl+0xda/0xda0 drivers/vhost/vhost.c:2108 vhost_vsock_dev_ioctl+0x2bb/0xfa0 drivers/vhost/vsock.c:875 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 13417: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2190 [inline] slab_free mm/slub.c:4430 [inline] kfree+0x149/0x350 mm/slub.c:4551 vhost_worker_destroy drivers/vhost/vhost.c:629 [inline] vhost_workers_free drivers/vhost/vhost.c:648 [inline] vhost_dev_cleanup+0x9b0/0xba0 drivers/vhost/vhost.c:1051 vhost_vsock_dev_release+0x3aa/0x410 drivers/vhost/vsock.c:751 __fput+0x406/0x8b0 fs/file_table.c:422 __do_sys_close fs/open.c:1555 [inline] __se_sys_close fs/open.c:1540 [inline] __x64_sys_close+0x7f/0x110 fs/open.c:1540 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88802d6d4800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 128 bytes inside of freed 512-byte region [ffff88802d6d4800, ffff88802d6d4a00) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2d6d4 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 ksm flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffefff(slab) raw: 00fff00000000040 ffff888015041c80 ffffea0000914f00 dead000000000003 raw: 0000000000000000 0000000000100010 00000001ffffefff 0000000000000000 head: 00fff00000000040 ffff888015041c80 ffffea0000914f00 dead000000000003 head: 0000000000000000 0000000000100010 00000001ffffefff 0000000000000000 head: 00fff00000000002 ffffea0000b5b501 ffffffffffffffff 0000000000000000 head: 0000000000000004 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 784, tgid 784 (kworker/0:2), ts 63028983441, free_ts 62882825114 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1468 prep_new_page mm/page_alloc.c:1476 [inline] get_page_from_freelist+0x2ce2/0x2d90 mm/page_alloc.c:3438 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4696 __alloc_pages_node_noprof include/linux/gfp.h:244 [inline] alloc_pages_node_noprof include/linux/gfp.h:271 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2259 allocate_slab+0x5a/0x2e0 mm/slub.c:2422 new_slab mm/slub.c:2475 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3661 __slab_alloc+0x58/0xa0 mm/slub.c:3751 __slab_alloc_node mm/slub.c:3804 [inline] slab_alloc_node mm/slub.c:3982 [inline] __do_kmalloc_node mm/slub.c:4114 [inline] __kmalloc_noprof+0x25e/0x400 mm/slub.c:4128 kmalloc_noprof include/linux/slab.h:664 [inline] switchdev_deferred_enqueue+0x44/0x260 net/switchdev/switchdev.c:117 switchdev_port_obj_add_defer net/switchdev/switchdev.c:266 [inline] switchdev_port_obj_add+0x127/0x340 net/switchdev/switchdev.c:285 br_switchdev_host_mdb_one net/bridge/br_switchdev.c:559 [inline] br_switchdev_host_mdb net/bridge/br_switchdev.c:574 [inline] br_switchdev_mdb_notify+0x688/0xf00 net/bridge/br_switchdev.c:649 br_mdb_notify+0x67/0xa10 net/bridge/br_mdb.c:529 br_multicast_host_join net/bridge/br_multicast.c:1482 [inline] __br_multicast_add_group+0x857/0xa20 net/bridge/br_multicast.c:1525 br_multicast_add_group net/bridge/br_multicast.c:1569 [inline] br_ip6_multicast_add_group net/bridge/br_multicast.c:1621 [inline] br_ip6_multicast_mld2_report net/bridge/br_multicast.c:2978 [inline] br_multicast_ipv6_rcv net/bridge/br_multicast.c:3916 [inline] br_multicast_rcv+0x3f7c/0x8180 net/bridge/br_multicast.c:3974 br_dev_xmit+0xb17/0x1a10 net/bridge/br_device.c:90 __netdev_start_xmit include/linux/netdevice.h:4880 [inline] netdev_start_xmit include/linux/netdevice.h:4894 [inline] xmit_one net/core/dev.c:3564 [inline] dev_hard_start_xmit+0x27a/0x7e0 net/core/dev.c:3580 page last free pid 5167 tgid 5167 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1088 [inline] free_unref_page+0xd22/0xea0 mm/page_alloc.c:2601 discard_slab mm/slub.c:2521 [inline] __put_partials+0xeb/0x130 mm/slub.c:2989 put_cpu_partial+0x17c/0x250 mm/slub.c:3064 __slab_free+0x2ea/0x3d0 mm/slub.c:4300 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3934 [inline] slab_alloc_node mm/slub.c:3994 [inline] kmem_cache_alloc_noprof+0x135/0x290 mm/slub.c:4001 getname_flags+0xbd/0x4f0 fs/namei.c:139 do_sys_openat2+0xd2/0x1d0 fs/open.c:1399 do_sys_open fs/open.c:1420 [inline] __do_sys_openat fs/open.c:1436 [inline] __se_sys_openat fs/open.c:1431 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1431 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88802d6d4780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802d6d4800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802d6d4880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802d6d4900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802d6d4980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================