Date
July 20, 2025, 11:12 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 15.474920] ================================================================== [ 15.474986] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x168/0x308 [ 15.478202] Read of size 1 at addr fff00000c3fc6200 by task kunit_try_catch/192 [ 15.478709] [ 15.478860] CPU: 0 UID: 0 PID: 192 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6 #1 PREEMPT [ 15.479252] Tainted: [B]=BAD_PAGE, [N]=TEST [ 15.479282] Hardware name: linux,dummy-virt (DT) [ 15.479316] Call trace: [ 15.479340] show_stack+0x20/0x38 (C) [ 15.479390] dump_stack_lvl+0x8c/0xd0 [ 15.479438] print_report+0x118/0x5d0 [ 15.480949] kasan_report+0xdc/0x128 [ 15.481464] __kasan_check_byte+0x54/0x70 [ 15.482039] kfree_sensitive+0x30/0xb0 [ 15.482312] kmalloc_double_kzfree+0x168/0x308 [ 15.482386] kunit_try_run_case+0x170/0x3f0 [ 15.482437] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.482489] kthread+0x328/0x630 [ 15.482531] ret_from_fork+0x10/0x20 [ 15.483751] [ 15.483778] Allocated by task 192: [ 15.483904] kasan_save_stack+0x3c/0x68 [ 15.484213] kasan_save_track+0x20/0x40 [ 15.484448] kasan_save_alloc_info+0x40/0x58 [ 15.485075] __kasan_kmalloc+0xd4/0xd8 [ 15.485559] __kmalloc_cache_noprof+0x16c/0x3c0 [ 15.485685] kmalloc_double_kzfree+0xb8/0x308 [ 15.486009] kunit_try_run_case+0x170/0x3f0 [ 15.486111] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.486155] kthread+0x328/0x630 [ 15.486189] ret_from_fork+0x10/0x20 [ 15.486226] [ 15.486785] Freed by task 192: [ 15.486823] kasan_save_stack+0x3c/0x68 [ 15.487043] kasan_save_track+0x20/0x40 [ 15.487095] kasan_save_free_info+0x4c/0x78 [ 15.487136] __kasan_slab_free+0x6c/0x98 [ 15.487174] kfree+0x214/0x3c8 [ 15.487206] kfree_sensitive+0x80/0xb0 [ 15.487243] kmalloc_double_kzfree+0x11c/0x308 [ 15.487281] kunit_try_run_case+0x170/0x3f0 [ 15.487318] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.487536] kthread+0x328/0x630 [ 15.487574] ret_from_fork+0x10/0x20 [ 15.487611] [ 15.487739] The buggy address belongs to the object at fff00000c3fc6200 [ 15.487739] which belongs to the cache kmalloc-16 of size 16 [ 15.488247] The buggy address is located 0 bytes inside of [ 15.488247] freed 16-byte region [fff00000c3fc6200, fff00000c3fc6210) [ 15.488339] [ 15.488673] The buggy address belongs to the physical page: [ 15.488714] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103fc6 [ 15.489115] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 15.489500] page_type: f5(slab) [ 15.489728] raw: 0bfffe0000000000 fff00000c0001640 dead000000000122 0000000000000000 [ 15.489822] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 15.490027] page dumped because: kasan: bad access detected [ 15.490063] [ 15.490082] Memory state around the buggy address: [ 15.490119] fff00000c3fc6100: 00 06 fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 15.490317] fff00000c3fc6180: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 15.490360] >fff00000c3fc6200: fa fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.490399] ^ [ 15.490959] fff00000c3fc6280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.491025] fff00000c3fc6300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.491645] ==================================================================
[ 12.638622] ================================================================== [ 12.639904] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x19c/0x350 [ 12.640248] Read of size 1 at addr ffff888101d1f560 by task kunit_try_catch/209 [ 12.640879] [ 12.641061] CPU: 0 UID: 0 PID: 209 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6 #1 PREEMPT(voluntary) [ 12.641104] Tainted: [B]=BAD_PAGE, [N]=TEST [ 12.641134] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 12.641153] Call Trace: [ 12.641165] <TASK> [ 12.641180] dump_stack_lvl+0x73/0xb0 [ 12.641209] print_report+0xd1/0x610 [ 12.641230] ? __virt_addr_valid+0x1db/0x2d0 [ 12.641251] ? kmalloc_double_kzfree+0x19c/0x350 [ 12.641273] ? kasan_complete_mode_report_info+0x64/0x200 [ 12.641293] ? kmalloc_double_kzfree+0x19c/0x350 [ 12.641315] kasan_report+0x141/0x180 [ 12.641344] ? kmalloc_double_kzfree+0x19c/0x350 [ 12.641369] ? kmalloc_double_kzfree+0x19c/0x350 [ 12.641390] __kasan_check_byte+0x3d/0x50 [ 12.641411] kfree_sensitive+0x22/0x90 [ 12.641433] kmalloc_double_kzfree+0x19c/0x350 [ 12.641456] ? __pfx_kmalloc_double_kzfree+0x10/0x10 [ 12.641479] ? __schedule+0x10cc/0x2b60 [ 12.641500] ? __pfx_read_tsc+0x10/0x10 [ 12.641520] ? ktime_get_ts64+0x86/0x230 [ 12.641543] kunit_try_run_case+0x1a5/0x480 [ 12.641567] ? __pfx_kunit_try_run_case+0x10/0x10 [ 12.641588] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 12.641610] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 12.641632] ? __kthread_parkme+0x82/0x180 [ 12.641651] ? preempt_count_sub+0x50/0x80 [ 12.641674] ? __pfx_kunit_try_run_case+0x10/0x10 [ 12.641696] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.641718] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 12.641740] kthread+0x337/0x6f0 [ 12.641758] ? trace_preempt_on+0x20/0xc0 [ 12.641780] ? __pfx_kthread+0x10/0x10 [ 12.641799] ? _raw_spin_unlock_irq+0x47/0x80 [ 12.641819] ? calculate_sigpending+0x7b/0xa0 [ 12.641843] ? __pfx_kthread+0x10/0x10 [ 12.641863] ret_from_fork+0x116/0x1d0 [ 12.641880] ? __pfx_kthread+0x10/0x10 [ 12.641900] ret_from_fork_asm+0x1a/0x30 [ 12.641938] </TASK> [ 12.641948] [ 12.655237] Allocated by task 209: [ 12.655624] kasan_save_stack+0x45/0x70 [ 12.656053] kasan_save_track+0x18/0x40 [ 12.656242] kasan_save_alloc_info+0x3b/0x50 [ 12.656544] __kasan_kmalloc+0xb7/0xc0 [ 12.656901] __kmalloc_cache_noprof+0x189/0x420 [ 12.657316] kmalloc_double_kzfree+0xa9/0x350 [ 12.657782] kunit_try_run_case+0x1a5/0x480 [ 12.658109] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.658283] kthread+0x337/0x6f0 [ 12.658698] ret_from_fork+0x116/0x1d0 [ 12.659053] ret_from_fork_asm+0x1a/0x30 [ 12.659453] [ 12.659610] Freed by task 209: [ 12.659939] kasan_save_stack+0x45/0x70 [ 12.660286] kasan_save_track+0x18/0x40 [ 12.660515] kasan_save_free_info+0x3f/0x60 [ 12.660915] __kasan_slab_free+0x56/0x70 [ 12.661106] kfree+0x222/0x3f0 [ 12.661234] kfree_sensitive+0x67/0x90 [ 12.661376] kmalloc_double_kzfree+0x12b/0x350 [ 12.661955] kunit_try_run_case+0x1a5/0x480 [ 12.662353] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.662902] kthread+0x337/0x6f0 [ 12.663220] ret_from_fork+0x116/0x1d0 [ 12.663651] ret_from_fork_asm+0x1a/0x30 [ 12.664015] [ 12.664118] The buggy address belongs to the object at ffff888101d1f560 [ 12.664118] which belongs to the cache kmalloc-16 of size 16 [ 12.664744] The buggy address is located 0 bytes inside of [ 12.664744] freed 16-byte region [ffff888101d1f560, ffff888101d1f570) [ 12.665833] [ 12.666005] The buggy address belongs to the physical page: [ 12.666222] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x101d1f [ 12.666644] flags: 0x200000000000000(node=0|zone=2) [ 12.667110] page_type: f5(slab) [ 12.667407] raw: 0200000000000000 ffff888100041640 dead000000000122 0000000000000000 [ 12.668208] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 12.668952] page dumped because: kasan: bad access detected [ 12.669195] [ 12.669265] Memory state around the buggy address: [ 12.669472] ffff888101d1f400: 00 02 fc fc 00 02 fc fc 00 02 fc fc fa fb fc fc [ 12.670143] ffff888101d1f480: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 12.670820] >ffff888101d1f500: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 12.671704] ^ [ 12.672778] ffff888101d1f580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.673313] ffff888101d1f600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.673546] ==================================================================