Date
July 18, 2025, 1:09 p.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 31.694141] ================================================================== [ 31.694214] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x168/0x308 [ 31.694284] Read of size 1 at addr fff00000c907e100 by task kunit_try_catch/223 [ 31.694576] [ 31.694644] CPU: 0 UID: 0 PID: 223 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6-next-20250718 #1 PREEMPT [ 31.694733] Tainted: [B]=BAD_PAGE, [N]=TEST [ 31.694761] Hardware name: linux,dummy-virt (DT) [ 31.694844] Call trace: [ 31.694871] show_stack+0x20/0x38 (C) [ 31.694924] dump_stack_lvl+0x8c/0xd0 [ 31.695225] print_report+0x118/0x5e8 [ 31.695310] kasan_report+0xdc/0x128 [ 31.695354] __kasan_check_byte+0x54/0x70 [ 31.695564] kfree_sensitive+0x30/0xb0 [ 31.695643] kmalloc_double_kzfree+0x168/0x308 [ 31.695696] kunit_try_run_case+0x170/0x3f0 [ 31.696122] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.696301] kthread+0x328/0x630 [ 31.696359] ret_from_fork+0x10/0x20 [ 31.696646] [ 31.696755] Allocated by task 223: [ 31.696900] kasan_save_stack+0x3c/0x68 [ 31.697221] kasan_save_track+0x20/0x40 [ 31.697346] kasan_save_alloc_info+0x40/0x58 [ 31.697424] __kasan_kmalloc+0xd4/0xd8 [ 31.697478] __kmalloc_cache_noprof+0x16c/0x3c0 [ 31.697674] kmalloc_double_kzfree+0xb8/0x308 [ 31.697936] kunit_try_run_case+0x170/0x3f0 [ 31.697986] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.698034] kthread+0x328/0x630 [ 31.698414] ret_from_fork+0x10/0x20 [ 31.698534] [ 31.698577] Freed by task 223: [ 31.698606] kasan_save_stack+0x3c/0x68 [ 31.698785] kasan_save_track+0x20/0x40 [ 31.699007] kasan_save_free_info+0x4c/0x78 [ 31.699134] __kasan_slab_free+0x6c/0x98 [ 31.699171] kfree+0x214/0x3c8 [ 31.699462] kfree_sensitive+0x80/0xb0 [ 31.699601] kmalloc_double_kzfree+0x11c/0x308 [ 31.699690] kunit_try_run_case+0x170/0x3f0 [ 31.699756] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.699799] kthread+0x328/0x630 [ 31.699833] ret_from_fork+0x10/0x20 [ 31.699867] [ 31.700239] The buggy address belongs to the object at fff00000c907e100 [ 31.700239] which belongs to the cache kmalloc-16 of size 16 [ 31.700354] The buggy address is located 0 bytes inside of [ 31.700354] freed 16-byte region [fff00000c907e100, fff00000c907e110) [ 31.700477] [ 31.700518] The buggy address belongs to the physical page: [ 31.700558] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xfff00000c907e020 pfn:0x10907e [ 31.700942] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 31.701070] page_type: f5(slab) [ 31.701143] raw: 0bfffe0000000000 fff00000c0001640 dead000000000122 0000000000000000 [ 31.701474] raw: fff00000c907e020 000000008080007f 00000000f5000000 0000000000000000 [ 31.701542] page dumped because: kasan: bad access detected [ 31.701634] [ 31.701666] Memory state around the buggy address: [ 31.701699] fff00000c907e000: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 31.701772] fff00000c907e080: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 31.702100] >fff00000c907e100: fa fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.702197] ^ [ 31.702279] fff00000c907e180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.702358] fff00000c907e200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.702670] ==================================================================
[ 25.173121] ================================================================== [ 25.173685] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x19c/0x350 [ 25.174122] Read of size 1 at addr ffff888105380c40 by task kunit_try_catch/240 [ 25.174616] [ 25.174723] CPU: 0 UID: 0 PID: 240 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6-next-20250718 #1 PREEMPT(voluntary) [ 25.174774] Tainted: [B]=BAD_PAGE, [N]=TEST [ 25.174785] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 25.174807] Call Trace: [ 25.174820] <TASK> [ 25.174836] dump_stack_lvl+0x73/0xb0 [ 25.174870] print_report+0xd1/0x640 [ 25.174921] ? __virt_addr_valid+0x1db/0x2d0 [ 25.174945] ? kmalloc_double_kzfree+0x19c/0x350 [ 25.174966] ? kasan_complete_mode_report_info+0x64/0x200 [ 25.174991] ? kmalloc_double_kzfree+0x19c/0x350 [ 25.175013] kasan_report+0x141/0x180 [ 25.175033] ? kmalloc_double_kzfree+0x19c/0x350 [ 25.175057] ? kmalloc_double_kzfree+0x19c/0x350 [ 25.175144] __kasan_check_byte+0x3d/0x50 [ 25.175171] kfree_sensitive+0x22/0x90 [ 25.175192] kmalloc_double_kzfree+0x19c/0x350 [ 25.175303] ? __pfx_kmalloc_double_kzfree+0x10/0x10 [ 25.175326] ? sysvec_apic_timer_interrupt+0x50/0x90 [ 25.175352] ? trace_hardirqs_on+0x37/0xe0 [ 25.175375] ? __pfx_read_tsc+0x10/0x10 [ 25.175396] ? ktime_get_ts64+0x86/0x230 [ 25.175420] kunit_try_run_case+0x1a5/0x480 [ 25.175445] ? __pfx_kunit_try_run_case+0x10/0x10 [ 25.175467] ? queued_spin_lock_slowpath+0x116/0xb40 [ 25.175502] ? __kthread_parkme+0x82/0x180 [ 25.175521] ? preempt_count_sub+0x50/0x80 [ 25.175544] ? __pfx_kunit_try_run_case+0x10/0x10 [ 25.175566] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.175588] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 25.175610] kthread+0x337/0x6f0 [ 25.175628] ? trace_preempt_on+0x20/0xc0 [ 25.175649] ? __pfx_kthread+0x10/0x10 [ 25.175668] ? _raw_spin_unlock_irq+0x47/0x80 [ 25.175698] ? calculate_sigpending+0x7b/0xa0 [ 25.175720] ? __pfx_kthread+0x10/0x10 [ 25.175741] ret_from_fork+0x116/0x1d0 [ 25.175759] ? __pfx_kthread+0x10/0x10 [ 25.175778] ret_from_fork_asm+0x1a/0x30 [ 25.175858] </TASK> [ 25.175870] [ 25.183662] Allocated by task 240: [ 25.183791] kasan_save_stack+0x45/0x70 [ 25.183990] kasan_save_track+0x18/0x40 [ 25.184169] kasan_save_alloc_info+0x3b/0x50 [ 25.184378] __kasan_kmalloc+0xb7/0xc0 [ 25.184551] __kmalloc_cache_noprof+0x189/0x420 [ 25.184695] kmalloc_double_kzfree+0xa9/0x350 [ 25.184889] kunit_try_run_case+0x1a5/0x480 [ 25.185072] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.185385] kthread+0x337/0x6f0 [ 25.185528] ret_from_fork+0x116/0x1d0 [ 25.185699] ret_from_fork_asm+0x1a/0x30 [ 25.185977] [ 25.186071] Freed by task 240: [ 25.186331] kasan_save_stack+0x45/0x70 [ 25.186553] kasan_save_track+0x18/0x40 [ 25.186711] kasan_save_free_info+0x3f/0x60 [ 25.187061] __kasan_slab_free+0x56/0x70 [ 25.187235] kfree+0x222/0x3f0 [ 25.187388] kfree_sensitive+0x67/0x90 [ 25.187585] kmalloc_double_kzfree+0x12b/0x350 [ 25.187746] kunit_try_run_case+0x1a5/0x480 [ 25.188049] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.188308] kthread+0x337/0x6f0 [ 25.188465] ret_from_fork+0x116/0x1d0 [ 25.188627] ret_from_fork_asm+0x1a/0x30 [ 25.188902] [ 25.188999] The buggy address belongs to the object at ffff888105380c40 [ 25.188999] which belongs to the cache kmalloc-16 of size 16 [ 25.189513] The buggy address is located 0 bytes inside of [ 25.189513] freed 16-byte region [ffff888105380c40, ffff888105380c50) [ 25.190041] [ 25.190128] The buggy address belongs to the physical page: [ 25.190383] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105380 [ 25.190733] flags: 0x200000000000000(node=0|zone=2) [ 25.190959] page_type: f5(slab) [ 25.191082] raw: 0200000000000000 ffff888100041640 dead000000000122 0000000000000000 [ 25.191309] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 25.191521] page dumped because: kasan: bad access detected [ 25.191782] [ 25.191925] Memory state around the buggy address: [ 25.192169] ffff888105380b00: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 25.192510] ffff888105380b80: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 25.192828] >ffff888105380c00: fa fb fc fc fa fb fc fc fa fb fc fc fc fc fc fc [ 25.193135] ^ [ 25.193646] ffff888105380c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.194038] ffff888105380d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.194308] ==================================================================