================================================================== BUG: KASAN: slab-use-after-free in rt_spin_lock+0x83/0x400 kernel/locking/spinlock_rt.c:56 Read of size 1 at addr ffff88805b328200 by task syz.3.160/6318 CPU: 1 UID: 0 PID: 6318 Comm: syz.3.160 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xba/0x230 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 __kasan_check_byte+0x2a/0x40 mm/kasan/common.c:574 kasan_check_byte include/linux/kasan.h:402 [inline] lock_acquire+0x79/0x2e0 kernel/locking/lockdep.c:5842 rt_spin_lock+0x83/0x400 kernel/locking/spinlock_rt.c:56 spin_lock include/linux/spinlock_rt.h:45 [inline] __wake_up_common_lock+0x2f/0x1e0 kernel/sched/wait.c:124 snd_pcm_post_stop sound/core/pcm_native.c:1551 [inline] snd_pcm_action_single sound/core/pcm_native.c:-1 [inline] snd_pcm_action sound/core/pcm_native.c:1398 [inline] snd_pcm_stop+0x428/0x550 sound/core/pcm_native.c:1571 loopback_check_format sound/drivers/aloop.c:400 [inline] loopback_trigger+0x1240/0x1d50 sound/drivers/aloop.c:421 snd_pcm_do_start sound/core/pcm_native.c:1459 [inline] snd_pcm_action_single sound/core/pcm_native.c:1315 [inline] snd_pcm_action sound/core/pcm_native.c:1398 [inline] snd_pcm_start+0x43d/0x5d0 sound/core/pcm_native.c:1506 __snd_pcm_lib_xfer+0x175a/0x1d10 sound/core/pcm_lib.c:2405 snd_pcm_oss_write3+0x1bc/0x350 sound/core/oss/pcm_oss.c:1245 snd_pcm_oss_write2+0x2c2/0x440 sound/core/oss/pcm_oss.c:1385 snd_pcm_oss_sync1+0x194/0x540 sound/core/oss/pcm_oss.c:1619 snd_pcm_oss_sync+0xab2/0xfc0 sound/core/oss/pcm_oss.c:1684 snd_pcm_oss_release+0x102/0x250 sound/core/oss/pcm_oss.c:2578 __fput+0x461/0xa90 fs/file_table.c:469 task_work_run+0x1d9/0x270 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:67 [inline] exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline] do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe8b2ecc799 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff84a0e6b8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007fe8b3147da0 RCX: 00007fe8b2ecc799 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007fe8b3147da0 R08: 0000000000000006 R09: 0000000000000000 R10: 00007fe8b3147cb0 R11: 0000000000000246 R12: 000000000001dff0 R13: 00007fe8b314609c R14: 000000000001dd6b R15: 00007fe8b3146090 Allocated by task 6319: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x3a6/0x690 mm/slub.c:5380 kmalloc_noprof include/linux/slab.h:950 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] snd_pcm_attach_substream+0x5b7/0xb20 sound/core/pcm.c:938 snd_pcm_open_substream+0xbd/0x2420 sound/core/pcm_native.c:2774 snd_pcm_oss_open_file sound/core/oss/pcm_oss.c:2442 [inline] snd_pcm_oss_open+0xfc2/0x1c50 sound/core/oss/pcm_oss.c:2523 chrdev_open+0x4d0/0x5f0 fs/char_dev.c:411 do_dentry_open+0x83d/0x13e0 fs/open.c:949 vfs_open+0x3b/0x350 fs/open.c:1081 do_open fs/namei.c:4671 [inline] path_openat+0x2e43/0x38a0 fs/namei.c:4830 do_file_open+0x23e/0x4a0 fs/namei.c:4859 do_sys_openat2+0x113/0x200 fs/open.c:1366 do_sys_open fs/open.c:1372 [inline] __do_sys_openat fs/open.c:1388 [inline] __se_sys_openat fs/open.c:1383 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1383 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6319: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2685 [inline] slab_free mm/slub.c:6165 [inline] kfree+0x1c1/0x6c0 mm/slub.c:6483 snd_pcm_detach_substream+0x1e1/0x290 sound/core/pcm.c:1003 snd_pcm_oss_release_file sound/core/oss/pcm_oss.c:2401 [inline] snd_pcm_oss_release+0x184/0x250 sound/core/oss/pcm_oss.c:2580 __fput+0x461/0xa90 fs/file_table.c:469 task_work_run+0x1d9/0x270 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:67 [inline] exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline] do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88805b328000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 512 bytes inside of freed 2048-byte region [ffff88805b328000, ffff88805b328800) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88805b32d000 pfn:0x5b328 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x80000000000240(workingset|head|node=0|zone=1) page_type: f5(slab) raw: 0080000000000240 ffff88813fe1d000 ffffea0000ec9410 ffffea000083b010 raw: ffff88805b32d000 0000000800080005 00000000f5000000 0000000000000000 head: 0080000000000240 ffff88813fe1d000 ffffea0000ec9410 ffffea000083b010 head: ffff88805b32d000 0000000800080005 00000000f5000000 0000000000000000 head: 0080000000000003 ffffea00016cca01 00000000ffffffff 00000000ffffffff head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5800, tgid 5800 (syz-executor), ts 89659669742, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889 prep_new_page mm/page_alloc.c:1897 [inline] get_page_from_freelist+0x28bb/0x2950 mm/page_alloc.c:3962 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250 alloc_slab_page mm/slub.c:3292 [inline] allocate_slab+0x77/0x660 mm/slub.c:3481 new_slab mm/slub.c:3539 [inline] refill_objects+0x334/0x3c0 mm/slub.c:7175 refill_sheaf mm/slub.c:2812 [inline] __pcs_replace_empty_main+0x35c/0x710 mm/slub.c:4615 alloc_from_pcs mm/slub.c:4717 [inline] slab_alloc_node mm/slub.c:4851 [inline] __do_kmalloc_node mm/slub.c:5259 [inline] __kmalloc_node_track_caller_noprof+0x60b/0x7e0 mm/slub.c:5368 kmalloc_reserve net/core/skbuff.c:635 [inline] pskb_expand_head+0x228/0x1320 net/core/skbuff.c:2315 netlink_trim+0x1b3/0x2c0 net/netlink/af_netlink.c:1299 netlink_broadcast_filtered+0xd6/0x1010 net/netlink/af_netlink.c:1512 nlmsg_multicast_filtered include/net/netlink.h:1165 [inline] nlmsg_multicast include/net/netlink.h:1184 [inline] nlmsg_notify+0xf0/0x1a0 net/netlink/af_netlink.c:2593 rtnl_notify net/core/rtnetlink.c:958 [inline] rtmsg_ifinfo_send net/core/rtnetlink.c:4436 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:4452 [inline] rtnetlink_event+0x224/0x270 net/core/rtnetlink.c:7018 notifier_call_chain+0x1be/0x400 kernel/notifier.c:85 netdev_lower_state_changed+0xc4/0x140 net/core/dev.c:9537 bond_lower_state_changed drivers/net/bonding/bond_main.c:1830 [inline] bond_commit_link_state+0x1d5/0x380 include/net/bonding.h:625 bond_set_slave_link_state include/net/bonding.h:639 [inline] bond_enslave+0x1a2b/0x3ca0 drivers/net/bonding/bond_main.c:-1 page_owner free stack trace missing Memory state around the buggy address: ffff88805b328100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805b328180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805b328200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805b328280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805b328300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================