syzbot

BUG: sleeping function called from invalid context at net/core/sock.c:3258
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 4282, name: kworker/u5:2
5 locks held by kworker/u5:2/4282:
 #0: ffff88807707e138 ((wq_completion)hci0#2){+.+.}-{0:0}, at: process_one_work+0x760/0x1000 kernel/workqueue.c:-1
 #1: ffffc90002fafd00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work+0x7a3/0x1000 kernel/workqueue.c:2285
 #2: ffffffff8d37ece8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm+0x2c/0x130 include/net/bluetooth/hci_core.h:1502
 #3: ffff888021cadc20 (&conn->lock#2){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:364 [inline]
 #3: ffff888021cadc20 (&conn->lock#2){+.+.}-{2:2}, at: sco_conn_ready net/bluetooth/sco.c:1119 [inline]
 #3: ffff888021cadc20 (&conn->lock#2){+.+.}-{2:2}, at: sco_connect_cfm+0x26c/0xa40 net/bluetooth/sco.c:1204
 #4: ffff88807b655120 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1730 [inline]
 #4: ffff88807b655120 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: sco_conn_ready net/bluetooth/sco.c:1132 [inline]
 #4: ffff88807b655120 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: sco_connect_cfm+0x464/0xa40 net/bluetooth/sco.c:1204
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 0 PID: 4282 Comm: kworker/u5:2 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue: hci0 hci_rx_work
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 ___might_sleep+0x47c/0x600 kernel/sched/core.c:9658
 lock_sock_nested+0x5b/0x100 net/core/sock.c:3258
 lock_sock include/net/sock.h:1730 [inline]
 sco_conn_ready net/bluetooth/sco.c:1132 [inline]
 sco_connect_cfm+0x464/0xa40 net/bluetooth/sco.c:1204
 hci_connect_cfm+0x8f/0x130 include/net/bluetooth/hci_core.h:1505
 hci_conn_request_evt+0x6a2/0x9f0 net/bluetooth/hci_event.c:2914
 hci_event_packet+0x743/0x12f0 net/bluetooth/hci_event.c:6405
 hci_rx_work+0x255/0xa10 net/bluetooth/hci_core.c:5160
 process_one_work+0x863/0x1000 kernel/workqueue.c:2310
 worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0xf7/0x7c60 kernel/locking/lockdep.c:4882
Read of size 8 at addr ffff88807b6550a0 by task kworker/u5:2/4282

CPU: 0 PID: 4282 Comm: kworker/u5:2 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue: hci0 hci_rx_work
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 print_address_description+0x60/0x2d0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0xdf/0x130 mm/kasan/report.c:451
 __lock_acquire+0xf7/0x7c60 kernel/locking/lockdep.c:4882
 lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x32/0x50 kernel/locking/spinlock.c:178
 spin_lock_bh include/linux/spinlock.h:369 [inline]
 lock_sock_nested+0x68/0x100 net/core/sock.c:3259
 lock_sock include/net/sock.h:1730 [inline]
 sco_conn_ready net/bluetooth/sco.c:1132 [inline]
 sco_connect_cfm+0x464/0xa40 net/bluetooth/sco.c:1204
 hci_connect_cfm+0x8f/0x130 include/net/bluetooth/hci_core.h:1505
 hci_conn_request_evt+0x6a2/0x9f0 net/bluetooth/hci_event.c:2914
 hci_event_packet+0x743/0x12f0 net/bluetooth/hci_event.c:6405
 hci_rx_work+0x255/0xa10 net/bluetooth/hci_core.c:5160
 process_one_work+0x863/0x1000 kernel/workqueue.c:2310
 worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>

Allocated by task 4368:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc mm/kasan/common.c:513 [inline]
 __kasan_kmalloc+0xb5/0xf0 mm/kasan/common.c:522
 kmalloc include/linux/slab.h:612 [inline]
 sk_prot_alloc+0xe7/0x210 net/core/sock.c:1866
 sk_alloc+0x2f/0x310 net/core/sock.c:1922
 sco_sock_alloc net/bluetooth/sco.c:491 [inline]
 sco_sock_create+0xba/0x300 net/bluetooth/sco.c:526
 bt_sock_create+0x155/0x220 net/bluetooth/af_bluetooth.c:130
 __sock_create+0x47b/0x900 net/socket.c:1486
 sock_create net/socket.c:1542 [inline]
 __sys_socket+0xe2/0x170 net/socket.c:1584
 __do_sys_socket net/socket.c:1593 [inline]
 __se_sys_socket net/socket.c:1591 [inline]
 __x64_sys_socket+0x76/0x80 net/socket.c:1591
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Freed by task 4368:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:46
 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
 ____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1710 [inline]
 slab_free_freelist_hook+0xea/0x170 mm/slub.c:1736
 slab_free mm/slub.c:3504 [inline]
 kfree+0xef/0x2a0 mm/slub.c:4564
 sk_prot_free net/core/sock.c:1905 [inline]
 __sk_destruct+0x578/0x840 net/core/sock.c:1991
 sco_sock_release+0x254/0x310 net/bluetooth/sco.c:1101
 __sock_release net/socket.c:649 [inline]
 sock_close+0xd5/0x240 net/socket.c:1336
 __fput+0x234/0x930 fs/file_table.c:311
 task_work_run+0x125/0x1a0 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

The buggy address belongs to the object at ffff88807b655000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 160 bytes inside of
 2048-byte region [ffff88807b655000, ffff88807b655800)
The buggy address belongs to the page:
page:ffffea0001ed9400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7b650
head:ffffea0001ed9400 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888016842000
raw: 0000000000000000 0000000080080008 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 0x1d2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 7, ts 123369251583, free_ts 123350633445
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192
 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5487
 alloc_slab_page mm/slub.c:1780 [inline]
 allocate_slab mm/slub.c:1917 [inline]
 new_slab+0xc0/0x4b0 mm/slub.c:1980
 ___slab_alloc+0x81e/0xdf0 mm/slub.c:3013
 __slab_alloc mm/slub.c:3100 [inline]
 slab_alloc_node mm/slub.c:3191 [inline]
 __kmalloc_node_track_caller+0x1fc/0x3a0 mm/slub.c:4963
 kmalloc_reserve net/core/skbuff.c:356 [inline]
 __alloc_skb+0x22c/0x750 net/core/skbuff.c:427
 skb_copy+0x139/0x790 net/core/skbuff.c:1595
 mac80211_hwsim_tx_frame_no_nl+0xcc7/0x15d0 drivers/net/wireless/mac80211_hwsim.c:1569
 mac80211_hwsim_tx+0x742/0xe20 drivers/net/wireless/mac80211_hwsim.c:1673
 drv_tx net/mac80211/driver-ops.h:35 [inline]
 ieee80211_tx_frags+0x3ee/0x8d0 net/mac80211/tx.c:1721
 __ieee80211_tx+0x21b/0x4e0 net/mac80211/tx.c:1775
 ieee80211_tx+0x2e4/0x410 net/mac80211/tx.c:1955
 __ieee80211_subif_start_xmit+0x1094/0x3380 net/mac80211/tx.c:4257
 ieee80211_subif_start_xmit+0xde/0x590 net/mac80211/tx.c:4396
 __netdev_start_xmit include/linux/netdevice.h:5027 [inline]
 netdev_start_xmit include/linux/netdevice.h:5041 [inline]
 xmit_one net/core/dev.c:3649 [inline]
 dev_hard_start_xmit+0x2a5/0x7e0 net/core/dev.c:3665
 sch_direct_xmit+0x24e/0x4a0 net/sched/sch_generic.c:342
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1340 [inline]
 free_pcp_prepare mm/page_alloc.c:1391 [inline]
 free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317
 free_unref_page+0x94/0x280 mm/page_alloc.c:3396
 free_slab mm/slub.c:2020 [inline]
 discard_slab mm/slub.c:2026 [inline]
 __unfreeze_partials+0x1a5/0x200 mm/slub.c:2512
 put_cpu_partial+0x12d/0x190 mm/slub.c:2592
 qlist_free_all+0x35/0x90 mm/kasan/quarantine.c:176
 kasan_quarantine_reduce+0x150/0x160 mm/kasan/quarantine.c:283
 __kasan_slab_alloc+0x2f/0xd0 mm/kasan/common.c:444
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519
 slab_alloc_node mm/slub.c:3225 [inline]
 slab_alloc mm/slub.c:3233 [inline]
 kmem_cache_alloc_trace+0x103/0x2a0 mm/slub.c:3250
 kmalloc include/linux/slab.h:607 [inline]
 get_mountpoint+0x205/0x440 fs/namespace.c:756
 lock_mount+0xb4/0x2a0 fs/namespace.c:2268
 __do_sys_pivot_root fs/namespace.c:3888 [inline]
 __se_sys_pivot_root+0x299/0xc00 fs/namespace.c:3862
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Memory state around the buggy address:
 ffff88807b654f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88807b655000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807b655080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff88807b655100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807b655180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================