Date
July 18, 2025, 11:11 p.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 15.569746] ================================================================== [ 15.569849] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x168/0x308 [ 15.570068] Read of size 1 at addr fff00000c3ef7e00 by task kunit_try_catch/192 [ 15.570269] [ 15.570588] CPU: 1 UID: 0 PID: 192 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6 #1 PREEMPT [ 15.570714] Tainted: [B]=BAD_PAGE, [N]=TEST [ 15.570808] Hardware name: linux,dummy-virt (DT) [ 15.570879] Call trace: [ 15.570980] show_stack+0x20/0x38 (C) [ 15.571063] dump_stack_lvl+0x8c/0xd0 [ 15.571205] print_report+0x118/0x5d0 [ 15.571266] kasan_report+0xdc/0x128 [ 15.571764] __kasan_check_byte+0x54/0x70 [ 15.571879] kfree_sensitive+0x30/0xb0 [ 15.572035] kmalloc_double_kzfree+0x168/0x308 [ 15.572132] kunit_try_run_case+0x170/0x3f0 [ 15.572203] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.572472] kthread+0x328/0x630 [ 15.572662] ret_from_fork+0x10/0x20 [ 15.572779] [ 15.572849] Allocated by task 192: [ 15.573001] kasan_save_stack+0x3c/0x68 [ 15.573080] kasan_save_track+0x20/0x40 [ 15.573138] kasan_save_alloc_info+0x40/0x58 [ 15.573338] __kasan_kmalloc+0xd4/0xd8 [ 15.573568] __kmalloc_cache_noprof+0x16c/0x3c0 [ 15.573695] kmalloc_double_kzfree+0xb8/0x308 [ 15.573851] kunit_try_run_case+0x170/0x3f0 [ 15.573899] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.573944] kthread+0x328/0x630 [ 15.573976] ret_from_fork+0x10/0x20 [ 15.574308] [ 15.574555] Freed by task 192: [ 15.574782] kasan_save_stack+0x3c/0x68 [ 15.575104] kasan_save_track+0x20/0x40 [ 15.575310] kasan_save_free_info+0x4c/0x78 [ 15.575456] __kasan_slab_free+0x6c/0x98 [ 15.575548] kfree+0x214/0x3c8 [ 15.575730] kfree_sensitive+0x80/0xb0 [ 15.575771] kmalloc_double_kzfree+0x11c/0x308 [ 15.576020] kunit_try_run_case+0x170/0x3f0 [ 15.576237] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.576421] kthread+0x328/0x630 [ 15.576500] ret_from_fork+0x10/0x20 [ 15.576655] [ 15.576680] The buggy address belongs to the object at fff00000c3ef7e00 [ 15.576680] which belongs to the cache kmalloc-16 of size 16 [ 15.576793] The buggy address is located 0 bytes inside of [ 15.576793] freed 16-byte region [fff00000c3ef7e00, fff00000c3ef7e10) [ 15.577072] [ 15.577455] The buggy address belongs to the physical page: [ 15.577569] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103ef7 [ 15.577635] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 15.577685] page_type: f5(slab) [ 15.577982] raw: 0bfffe0000000000 fff00000c0001640 dead000000000122 0000000000000000 [ 15.578388] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 15.578436] page dumped because: kasan: bad access detected [ 15.578470] [ 15.578555] Memory state around the buggy address: [ 15.578798] fff00000c3ef7d00: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 15.579023] fff00000c3ef7d80: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 15.579094] >fff00000c3ef7e00: fa fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.579134] ^ [ 15.579162] fff00000c3ef7e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.579215] fff00000c3ef7f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.579253] ==================================================================
[ 12.517675] ================================================================== [ 12.518362] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x19c/0x350 [ 12.518865] Read of size 1 at addr ffff8881025c74e0 by task kunit_try_catch/211 [ 12.519320] [ 12.519431] CPU: 1 UID: 0 PID: 211 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6 #1 PREEMPT(voluntary) [ 12.519479] Tainted: [B]=BAD_PAGE, [N]=TEST [ 12.519490] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 12.519511] Call Trace: [ 12.519524] <TASK> [ 12.519552] dump_stack_lvl+0x73/0xb0 [ 12.519583] print_report+0xd1/0x610 [ 12.519605] ? __virt_addr_valid+0x1db/0x2d0 [ 12.519642] ? kmalloc_double_kzfree+0x19c/0x350 [ 12.519665] ? kasan_complete_mode_report_info+0x64/0x200 [ 12.519687] ? kmalloc_double_kzfree+0x19c/0x350 [ 12.519710] kasan_report+0x141/0x180 [ 12.519741] ? kmalloc_double_kzfree+0x19c/0x350 [ 12.519766] ? kmalloc_double_kzfree+0x19c/0x350 [ 12.519789] __kasan_check_byte+0x3d/0x50 [ 12.519822] kfree_sensitive+0x22/0x90 [ 12.519844] kmalloc_double_kzfree+0x19c/0x350 [ 12.519867] ? __pfx_kmalloc_double_kzfree+0x10/0x10 [ 12.519891] ? __schedule+0x10cc/0x2b60 [ 12.519914] ? __pfx_read_tsc+0x10/0x10 [ 12.519935] ? ktime_get_ts64+0x86/0x230 [ 12.519968] kunit_try_run_case+0x1a5/0x480 [ 12.519993] ? __pfx_kunit_try_run_case+0x10/0x10 [ 12.520015] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 12.520049] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 12.520072] ? __kthread_parkme+0x82/0x180 [ 12.520246] ? preempt_count_sub+0x50/0x80 [ 12.520274] ? __pfx_kunit_try_run_case+0x10/0x10 [ 12.520312] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.520337] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 12.520361] kthread+0x337/0x6f0 [ 12.520379] ? trace_preempt_on+0x20/0xc0 [ 12.520402] ? __pfx_kthread+0x10/0x10 [ 12.520422] ? _raw_spin_unlock_irq+0x47/0x80 [ 12.520443] ? calculate_sigpending+0x7b/0xa0 [ 12.520482] ? __pfx_kthread+0x10/0x10 [ 12.520503] ret_from_fork+0x116/0x1d0 [ 12.520521] ? __pfx_kthread+0x10/0x10 [ 12.520541] ret_from_fork_asm+0x1a/0x30 [ 12.520571] </TASK> [ 12.520581] [ 12.529046] Allocated by task 211: [ 12.529241] kasan_save_stack+0x45/0x70 [ 12.529402] kasan_save_track+0x18/0x40 [ 12.529539] kasan_save_alloc_info+0x3b/0x50 [ 12.529777] __kasan_kmalloc+0xb7/0xc0 [ 12.529961] __kmalloc_cache_noprof+0x189/0x420 [ 12.530181] kmalloc_double_kzfree+0xa9/0x350 [ 12.530555] kunit_try_run_case+0x1a5/0x480 [ 12.530728] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.530980] kthread+0x337/0x6f0 [ 12.531275] ret_from_fork+0x116/0x1d0 [ 12.531489] ret_from_fork_asm+0x1a/0x30 [ 12.531681] [ 12.531754] Freed by task 211: [ 12.531866] kasan_save_stack+0x45/0x70 [ 12.532001] kasan_save_track+0x18/0x40 [ 12.532211] kasan_save_free_info+0x3f/0x60 [ 12.532426] __kasan_slab_free+0x56/0x70 [ 12.532784] kfree+0x222/0x3f0 [ 12.533114] kfree_sensitive+0x67/0x90 [ 12.533321] kmalloc_double_kzfree+0x12b/0x350 [ 12.533560] kunit_try_run_case+0x1a5/0x480 [ 12.533716] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.533997] kthread+0x337/0x6f0 [ 12.534236] ret_from_fork+0x116/0x1d0 [ 12.534447] ret_from_fork_asm+0x1a/0x30 [ 12.534647] [ 12.534758] The buggy address belongs to the object at ffff8881025c74e0 [ 12.534758] which belongs to the cache kmalloc-16 of size 16 [ 12.535360] The buggy address is located 0 bytes inside of [ 12.535360] freed 16-byte region [ffff8881025c74e0, ffff8881025c74f0) [ 12.535880] [ 12.535987] The buggy address belongs to the physical page: [ 12.536311] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1025c7 [ 12.536592] flags: 0x200000000000000(node=0|zone=2) [ 12.536840] page_type: f5(slab) [ 12.537087] raw: 0200000000000000 ffff888100041640 dead000000000122 0000000000000000 [ 12.537537] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 12.537788] page dumped because: kasan: bad access detected [ 12.537969] [ 12.538073] Memory state around the buggy address: [ 12.538468] ffff8881025c7380: 00 06 fc fc 00 06 fc fc 00 04 fc fc 00 04 fc fc [ 12.538768] ffff8881025c7400: 00 01 fc fc 00 01 fc fc 00 04 fc fc 00 04 fc fc [ 12.539157] >ffff8881025c7480: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 12.539470] ^ [ 12.539667] ffff8881025c7500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.539978] ffff8881025c7580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.540298] ==================================================================