program: r0 = openat$dm_control(0xffffffffffffff9c, &(0x7f0000000040), 0x40102, 0x0) ioctl$DM_DEV_CREATE(r0, 0xc138fd03, &(0x7f0000000240)={0x4, 0x0, 0x0, 0x138, 0x138, 0x0, 0x0, 0x0, 0x0, 0x0, {0x0, {'syz', 0x0, '2\x00'}}}) ioctl$DM_TABLE_LOAD(r0, 0xc138fd09, &(0x7f0000000500)={0x4, 0x0, 0x0, 0x188, 0x138, 0x1, 0x0, 0x2c10, 0x0, 0x0, @by_dev={r1}, [@snapshot={0x0, 0x40, 0x0, 0x50, 'snapshot\x00', {@ram={'/dev/ram', 0x0}, 0x20, @ram_num={'1:', 0x0}, 0x20, 'P', 0x20, '8'}}]}) bpf$PROG_LOAD(0x5, &(0x7f0000000180)={0xb, 0x4, &(0x7f0000000080)=@framed={{0x18, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x4}, [@exit]}, &(0x7f0000000100)='GPL\x00', 0x0, 0x0, 0x0, 0x41000, 0x69, '\x00', 0x0, @fallback=0x15, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x94) [ 104.945890][ T4661] Bluetooth: hci0: command tx timeout [ 105.137295][ T5352] ================================================================== [ 105.137308][ T5352] BUG: KASAN: slab-use-after-free in snapshot_ctr+0x5cb/0x1340 [ 105.137511][ T5352] Read of size 8 at addr ffff8880401d8718 by task syz.0.0/5352 [ 105.137520][ T5352] [ 105.137527][ T5352] CPU: 0 UID: 0 PID: 5352 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 105.137540][ T5352] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 105.137555][ T5352] Call Trace: [ 105.137560][ T5352] [ 105.137564][ T5352] dump_stack_lvl+0xe8/0x150 [ 105.137619][ T5352] print_address_description+0x55/0x1e0 [ 105.137637][ T5352] ? snapshot_ctr+0x5cb/0x1340 [ 105.137648][ T5352] print_report+0x58/0x70 [ 105.137662][ T5352] kasan_report+0x117/0x150 [ 105.137716][ T5352] ? snapshot_ctr+0x5cb/0x1340 [ 105.137730][ T5352] snapshot_ctr+0x5cb/0x1340 [ 105.137745][ T5352] ? __pfx_snapshot_ctr+0x10/0x10 [ 105.137756][ T5352] ? skip_spaces+0x8a/0xa0 [ 105.137846][ T5352] ? dm_split_args+0x50b/0x5d0 [ 105.137866][ T5352] dm_table_add_target+0x58d/0xc70 [ 105.137885][ T5352] table_load+0x325/0x8a0 [ 105.137902][ T5352] ? __pfx_table_load+0x10/0x10 [ 105.137918][ T5352] ? __might_fault+0xaf/0x130 [ 105.137935][ T5352] dm_ctl_ioctl+0x9ec/0xe10 [ 105.137951][ T5352] ? __pfx_table_load+0x10/0x10 [ 105.137965][ T5352] ? __pfx_dm_ctl_ioctl+0x10/0x10 [ 105.137986][ T5352] ? __fget_files+0x2a/0x420 [ 105.138008][ T5352] ? bpf_lsm_file_ioctl+0x9/0x20 [ 105.138035][ T5352] ? __pfx_dm_ctl_ioctl+0x10/0x10 [ 105.138049][ T5352] __se_sys_ioctl+0xfc/0x170 [ 105.138064][ T5352] do_syscall_64+0x166/0x520 [ 105.138148][ T5352] ? trace_irq_disable+0x3b/0x140 [ 105.138164][ T5352] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 105.138184][ T5352] ? clear_bhb_loop+0x70/0xc0 [ 105.138195][ T5352] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 105.138206][ T5352] RIP: 0033:0x7ffb93d9f559 [ 105.138216][ T5352] 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 [ 105.138225][ T5352] RSP: 002b:00007ffb94cc1fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 105.138238][ T5352] RAX: ffffffffffffffda RBX: 00007ffb94025fa0 RCX: 00007ffb93d9f559 [ 105.138246][ T5352] RDX: 0000200000000500 RSI: 00000000c138fd09 RDI: 0000000000000003 [ 105.138253][ T5352] RBP: 00007ffb93e36b20 R08: 0000000000000000 R09: 0000000000000000 [ 105.138260][ T5352] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 105.138266][ T5352] R13: 00007ffb94026038 R14: 00007ffb94025fa0 R15: 00007fff364db8a8 [ 105.138290][ T5352] [ 105.138295][ T5352] [ 105.138297][ T5352] Allocated by task 5352: [ 105.138302][ T5352] kasan_save_track+0x3e/0x80 [ 105.138315][ T5352] __kasan_kmalloc+0x93/0xb0 [ 105.138325][ T5352] __kmalloc_cache_node_noprof+0x3cc/0x620 [ 105.138336][ T5352] dm_get_table_device+0x23e/0x730 [ 105.138345][ T5352] dm_get_device+0x327/0x760 [ 105.138358][ T5352] snapshot_ctr+0x2b2/0x1340 [ 105.138369][ T5352] dm_table_add_target+0x58d/0xc70 [ 105.138382][ T5352] table_load+0x325/0x8a0 [ 105.138394][ T5352] dm_ctl_ioctl+0x9ec/0xe10 [ 105.138406][ T5352] __se_sys_ioctl+0xfc/0x170 [ 105.138418][ T5352] do_syscall_64+0x166/0x520 [ 105.138430][ T5352] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 105.138438][ T5352] [ 105.138440][ T5352] Freed by task 5352: [ 105.138445][ T5352] kasan_save_track+0x3e/0x80 [ 105.138456][ T5352] kasan_save_free_info+0x40/0x50 [ 105.138464][ T5352] __kasan_slab_free+0x5c/0x80 [ 105.138475][ T5352] kfree+0x1c5/0x650 [ 105.138482][ T5352] dm_put_table_device+0x255/0x2a0 [ 105.138492][ T5352] dm_get_device+0x56f/0x760 [ 105.138504][ T5352] snapshot_ctr+0x471/0x1340 [ 105.138514][ T5352] dm_table_add_target+0x58d/0xc70 [ 105.138527][ T5352] table_load+0x325/0x8a0 [ 105.138540][ T5352] dm_ctl_ioctl+0x9ec/0xe10 [ 105.138552][ T5352] __se_sys_ioctl+0xfc/0x170 [ 105.138563][ T5352] do_syscall_64+0x166/0x520 [ 105.138574][ T5352] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 105.138583][ T5352] [ 105.138585][ T5352] The buggy address belongs to the object at ffff8880401d8700 [ 105.138585][ T5352] which belongs to the cache kmalloc-96 of size 96 [ 105.138594][ T5352] The buggy address is located 24 bytes inside of [ 105.138594][ T5352] freed 96-byte region [ffff8880401d8700, ffff8880401d8760) [ 105.138604][ T5352] [ 105.138607][ T5352] The buggy address belongs to the physical page: [ 105.138612][ T5352] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x401d8 [ 105.138622][ T5352] flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) [ 105.138631][ T5352] page_type: f5(slab) [ 105.138640][ T5352] raw: 04fff00000000000 ffff88801c441280 dead000000000100 dead000000000122 [ 105.138648][ T5352] raw: 0000000000000000 0000000000200020 00000000f5000000 0000000000000000 [ 105.138654][ T5352] page dumped because: kasan: bad access detected [ 105.138671][ T5352] page_owner tracks the page as allocated [ 105.138675][ T5352] page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, tgid 1 (swapper/0), ts 26941248141 [ 105.138691][ T5352] post_alloc_hook+0x1f9/0x250 [ 105.138700][ T5352] get_page_from_freelist+0x220f/0x2280 [ 105.138711][ T5352] __alloc_frozen_pages_noprof+0x1fe/0x410 [ 105.138722][ T5352] allocate_slab+0x7d/0x5e0 [ 105.138735][ T5352] ___slab_alloc+0x16a/0x960 [ 105.138746][ T5352] __kmalloc_cache_node_noprof+0x1d6/0x620 [ 105.138778][ T5352] __alloc_workqueue+0x7dc/0x21d0 [ 105.138810][ T5352] alloc_workqueue_noprof+0xe3/0x210 [ 105.138825][ T5352] adf_init_pf_wq+0x1a/0x40 [ 105.138966][ T5352] adf_register_module+0x21/0x70 [ 105.138975][ T5352] do_one_initcall+0x250/0x870 [ 105.138985][ T5352] do_initcall_level+0x10a/0x1a0 [ 105.139006][ T5352] do_initcalls+0x59/0xa0 [ 105.139014][ T5352] kernel_init_freeable+0x29d/0x3e0 [ 105.139023][ T5352] kernel_init+0x22/0x1d0 [ 105.139037][ T5352] ret_from_fork+0x514/0xb70 [ 105.139049][ T5352] page last free pid 2 tgid 2 ts 26940787401 stack trace: [ 105.139056][ T5352] __free_frozen_pages+0xc97/0xd90 [ 105.139065][ T5352] __kasan_populate_vmalloc+0x1a8/0x1c0 [ 105.139075][ T5352] alloc_vmap_area+0xd10/0x1410 [ 105.139089][ T5352] __get_vm_area_node+0x200/0x2f0 [ 105.139102][ T5352] __vmalloc_node_range_noprof+0x36e/0x16f0 [ 105.139116][ T5352] __vmalloc_node_noprof+0xc2/0x100 [ 105.139125][ T5352] dup_task_struct+0x2c6/0xa00 [ 105.139138][ T5352] copy_process+0x7ea/0x44b0 [ 105.139149][ T5352] kernel_clone+0x2d7/0x940 [ 105.139163][ T5352] kernel_thread+0x13f/0x1b0 [ 105.139175][ T5352] kthreadd+0x4ec/0x6e0 [ 105.139184][ T5352] ret_from_fork+0x514/0xb70 [ 105.139193][ T5352] ret_from_fork_asm+0x1a/0x30 [ 105.139203][ T5352] [ 105.139206][ T5352] Memory state around the buggy address: [ 105.139211][ T5352] ffff8880401d8600: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc [ 105.139218][ T5352] ffff8880401d8680: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc [ 105.139225][ T5352] >ffff8880401d8700: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc [ 105.139229][ T5352] ^ [ 105.139234][ T5352] ffff8880401d8780: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc [ 105.139240][ T5352] ffff8880401d8800: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc [ 105.139245][ T5352] ================================================================== [ 105.139355][ T5352] Kernel panic - not syncing: KASAN: panic_on_warn set ... [ 105.430440][ T5352] CPU: 0 UID: 0 PID: 5352 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 105.434510][ T5352] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 105.439216][ T5352] Call Trace: [ 105.440662][ T5352] [ 105.441980][ T5352] vpanic+0x26f/0x710 [ 105.443700][ T5352] panic+0xc5/0xd0 [ 105.445368][ T5352] ? __pfx_panic+0x10/0x10 [ 105.447389][ T5352] ? preempt_schedule_thunk+0x16/0x40 [ 105.449868][ T5352] ? snapshot_ctr+0x5cb/0x1340 [ 105.452050][ T5352] ? preempt_schedule_thunk+0x16/0x40 [ 105.454450][ T5352] ? snapshot_ctr+0x5cb/0x1340 [ 105.456550][ T5352] check_panic_on_warn+0x89/0xb0 [ 105.458636][ T5352] ? snapshot_ctr+0x5cb/0x1340 [ 105.460788][ T5352] end_report+0x73/0x170 [ 105.462628][ T5352] ? snapshot_ctr+0x5cb/0x1340 [ 105.464677][ T5352] kasan_report+0x128/0x150 [ 105.466580][ T5352] ? snapshot_ctr+0x5cb/0x1340 [ 105.468615][ T5352] snapshot_ctr+0x5cb/0x1340 [ 105.470701][ T5352] ? __pfx_snapshot_ctr+0x10/0x10 [ 105.473197][ T5352] ? skip_spaces+0x8a/0xa0 [ 105.475280][ T5352] ? dm_split_args+0x50b/0x5d0 [ 105.477578][ T5352] dm_table_add_target+0x58d/0xc70 [ 105.480003][ T5352] table_load+0x325/0x8a0 [ 105.481919][ T5352] ? __pfx_table_load+0x10/0x10 [ 105.484331][ T5352] ? __might_fault+0xaf/0x130 [ 105.486740][ T5352] dm_ctl_ioctl+0x9ec/0xe10 [ 105.488937][ T5352] ? __pfx_table_load+0x10/0x10 [ 105.491057][ T5352] ? __pfx_dm_ctl_ioctl+0x10/0x10 [ 105.493350][ T5352] ? __fget_files+0x2a/0x420 [ 105.495408][ T5352] ? bpf_lsm_file_ioctl+0x9/0x20 [ 105.497571][ T5352] ? __pfx_dm_ctl_ioctl+0x10/0x10 [ 105.499777][ T5352] __se_sys_ioctl+0xfc/0x170 [ 105.501777][ T5352] do_syscall_64+0x166/0x520 [ 105.503711][ T5352] ? trace_irq_disable+0x3b/0x140 [ 105.505776][ T5352] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 105.508165][ T5352] ? clear_bhb_loop+0x70/0xc0 [ 105.510162][ T5352] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 105.512705][ T5352] RIP: 0033:0x7ffb93d9f559 [ 105.514701][ T5352] 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 [ 105.522872][ T5352] RSP: 002b:00007ffb94cc1fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 105.526522][ T5352] RAX: ffffffffffffffda RBX: 00007ffb94025fa0 RCX: 00007ffb93d9f559 [ 105.529907][ T5352] RDX: 0000200000000500 RSI: 00000000c138fd09 RDI: 0000000000000003 [ 105.533282][ T5352] RBP: 00007ffb93e36b20 R08: 0000000000000000 R09: 0000000000000000 [ 105.536481][ T5352] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 105.539970][ T5352] R13: 00007ffb94026038 R14: 00007ffb94025fa0 R15: 00007fff364db8a8 [ 105.543348][ T5352] [ 105.544822][ T5352] Kernel Offset: disabled [ 105.546344][ T5352] Rebooting in 86400 seconds..