Hello, syzbot found the following issue on: HEAD commit: 5f583a3162ff Merge tag 'rust-fixes-6.10' of https://github.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11170741980000 kernel config: https://syzkaller.appspot.com/x/.config?x=f413acf5b1eb4093 dashboard link: https://syzkaller.appspot.com/bug?extid=c12e2f941af1feb5632c compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/f530c7950839/disk-5f583a31.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b4f810bbc13e/vmlinux-5f583a31.xz kernel image: https://storage.googleapis.com/syzbot-assets/a49ec6dadbad/bzImage-5f583a31.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c12e2f941af1feb5632c@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: slab-use-after-free in l2cap_connect.constprop.0+0x10d8/0x1270 net/bluetooth/l2cap_core.c:3949 Read of size 8 at addr ffff88802af53000 by task kworker/u9:4/5114 CPU: 1 PID: 5114 Comm: kworker/u9:4 Not tainted 6.10.0-rc4-syzkaller-00301-g5f583a3162ff #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Workqueue: hci1 hci_rx_work Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 l2cap_connect.constprop.0+0x10d8/0x1270 net/bluetooth/l2cap_core.c:3949 l2cap_connect_req net/bluetooth/l2cap_core.c:4080 [inline] l2cap_bredr_sig_cmd net/bluetooth/l2cap_core.c:4772 [inline] l2cap_sig_channel net/bluetooth/l2cap_core.c:5543 [inline] l2cap_recv_frame+0xf07/0x8e50 net/bluetooth/l2cap_core.c:6821 l2cap_recv_acldata+0x9ac/0xb60 net/bluetooth/l2cap_core.c:7510 hci_acldata_packet net/bluetooth/hci_core.c:3842 [inline] hci_rx_work+0xaa7/0x1610 net/bluetooth/hci_core.c:4079 process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> Allocated by task 4480: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387 kmalloc_noprof include/linux/slab.h:660 [inline] kzalloc_noprof include/linux/slab.h:778 [inline] l2cap_conn_add.part.0+0x60/0xa60 net/bluetooth/l2cap_core.c:6864 l2cap_conn_add net/bluetooth/l2cap_core.c:69 [inline] l2cap_connect_cfm+0x428/0xf80 net/bluetooth/l2cap_core.c:7241 hci_connect_cfm include/net/bluetooth/hci_core.h:1970 [inline] hci_remote_features_evt+0x548/0x9e0 net/bluetooth/hci_event.c:3721 hci_event_func net/bluetooth/hci_event.c:7417 [inline] hci_event_packet+0x9e3/0x1170 net/bluetooth/hci_event.c:7469 hci_rx_work+0x2c4/0x1610 net/bluetooth/hci_core.c:4074 process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Freed by task 5112: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object+0xf7/0x160 mm/kasan/common.c:240 __kasan_slab_free+0x32/0x50 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2196 [inline] slab_free mm/slub.c:4437 [inline] kfree+0x12a/0x3b0 mm/slub.c:4558 l2cap_conn_free net/bluetooth/l2cap_core.c:1810 [inline] kref_put include/linux/kref.h:65 [inline] l2cap_conn_put net/bluetooth/l2cap_core.c:1822 [inline] l2cap_conn_del+0x59d/0x740 net/bluetooth/l2cap_core.c:1802 l2cap_connect_cfm+0x9e6/0xf80 net/bluetooth/l2cap_core.c:7237 hci_connect_cfm include/net/bluetooth/hci_core.h:1970 [inline] hci_conn_failed+0x1c3/0x370 net/bluetooth/hci_conn.c:1257 hci_abort_conn_sync+0x75a/0xb50 net/bluetooth/hci_sync.c:5450 abort_conn_sync+0x197/0x360 net/bluetooth/hci_conn.c:2909 hci_cmd_sync_work+0x1a4/0x410 net/bluetooth/hci_sync.c:310 process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Last potentially related work creation: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xba/0xd0 mm/kasan/generic.c:541 insert_work+0x36/0x230 kernel/workqueue.c:2207 __queue_work+0x944/0x1020 kernel/workqueue.c:2359 call_timer_fn+0x1a0/0x610 kernel/time/timer.c:1792 expire_timers kernel/time/timer.c:1838 [inline] __run_timers+0x567/0xaf0 kernel/time/timer.c:2417 __run_timer_base kernel/time/timer.c:2428 [inline] __run_timer_base kernel/time/timer.c:2421 [inline] run_timer_base+0x111/0x190 kernel/time/timer.c:2437 run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2447 handle_softirqs+0x216/0x8f0 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu kernel/softirq.c:637 [inline] irq_exit_rcu+0xbb/0x120 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 Second to last potentially related work creation: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xba/0xd0 mm/kasan/generic.c:541 insert_work+0x36/0x230 kernel/workqueue.c:2207 __queue_work+0x525/0x1020 kernel/workqueue.c:2363 queue_work_on+0x11a/0x140 kernel/workqueue.c:2410 queue_work include/linux/workqueue.h:621 [inline] l2cap_conn_ready net/bluetooth/l2cap_core.c:1640 [inline] l2cap_connect_cfm+0x9c9/0xf80 net/bluetooth/l2cap_core.c:7282 hci_connect_cfm include/net/bluetooth/hci_core.h:1970 [inline] hci_remote_features_evt+0x548/0x9e0 net/bluetooth/hci_event.c:3721 hci_event_func net/bluetooth/hci_event.c:7417 [inline] hci_event_packet+0x9e3/0x1170 net/bluetooth/hci_event.c:7469 hci_rx_work+0x2c4/0x1610 net/bluetooth/hci_core.c:4074 process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the object at ffff88802af53000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 0 bytes inside of freed 1024-byte region [ffff88802af53000, ffff88802af53400) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2af50 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffefff(slab) raw: 00fff00000000040 ffff888015441dc0 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000100010 00000001ffffefff 0000000000000000 head: 00fff00000000040 ffff888015441dc0 0000000000000000 dead000000000001 head: 0000000000000000 0000000000100010 00000001ffffefff 0000000000000000 head: 00fff00000000003 ffffea0000abd401 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4752, tgid 4752 (dhcpcd), ts 66098690934, free_ts 66038999175 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1468 prep_new_page mm/page_alloc.c:1476 [inline] get_page_from_freelist+0x136a/0x2e50 mm/page_alloc.c:3420 __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4678 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x56/0x110 mm/slub.c:2265 allocate_slab mm/slub.c:2428 [inline] new_slab+0x84/0x260 mm/slub.c:2481 ___slab_alloc+0xdac/0x1870 mm/slub.c:3667 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3757 __slab_alloc_node mm/slub.c:3810 [inline] slab_alloc_node mm/slub.c:3989 [inline] __do_kmalloc_node mm/slub.c:4121 [inline] kmalloc_node_track_caller_noprof+0x355/0x430 mm/slub.c:4142 kmemdup_noprof+0x29/0x60 mm/util.c:131 kmemdup_noprof include/linux/fortify-string.h:757 [inline] bpf_migrate_filter+0xc6/0x390 net/core/filter.c:1268 bpf_prepare_filter+0x183/0x380 net/core/filter.c:1354 bpf_prog_create_from_user+0x1e4/0x2d0 net/core/filter.c:1448 seccomp_prepare_filter kernel/seccomp.c:680 [inline] seccomp_prepare_user_filter kernel/seccomp.c:717 [inline] seccomp_set_mode_filter kernel/seccomp.c:1935 [inline] do_seccomp+0x7b6/0x2580 kernel/seccomp.c:2055 prctl_set_seccomp+0x4b/0x70 kernel/seccomp.c:2108 __do_sys_prctl+0xc83/0x1e40 kernel/sys.c:2539 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 page last free pid 4747 tgid 4747 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1088 [inline] free_unref_page+0x64a/0xe40 mm/page_alloc.c:2583 __put_partials+0x14c/0x170 mm/slub.c:2995 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3941 [inline] slab_alloc_node mm/slub.c:4001 [inline] kmem_cache_alloc_lru_noprof+0x121/0x2f0 mm/slub.c:4020 shmem_alloc_inode+0x25/0x50 mm/shmem.c:4468 alloc_inode+0x5d/0x230 fs/inode.c:261 new_inode_pseudo fs/inode.c:1007 [inline] new_inode+0x22/0x270 fs/inode.c:1033 __shmem_get_inode mm/shmem.c:2503 [inline] shmem_get_inode+0x194/0xe80 mm/shmem.c:2574 shmem_mknod+0x66/0x240 mm/shmem.c:3268 shmem_mkdir+0x31/0x60 mm/shmem.c:3329 vfs_mkdir+0x57d/0x860 fs/namei.c:4131 do_mkdirat+0x301/0x3a0 fs/namei.c:4154 __do_sys_mkdir fs/namei.c:4174 [inline] __se_sys_mkdir fs/namei.c:4172 [inline] __x64_sys_mkdir+0xf1/0x140 fs/namei.c:4172 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 Memory state around the buggy address: ffff88802af52f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802af52f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802af53000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802af53080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802af53100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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