Date
July 10, 2025, 11:10 p.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 16.093213] ================================================================== [ 16.093443] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x168/0x308 [ 16.093659] Read of size 1 at addr fff00000c5ff7a40 by task kunit_try_catch/192 [ 16.093828] [ 16.093867] CPU: 1 UID: 0 PID: 192 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc5 #1 PREEMPT [ 16.094129] Tainted: [B]=BAD_PAGE, [N]=TEST [ 16.094157] Hardware name: linux,dummy-virt (DT) [ 16.094424] Call trace: [ 16.094450] show_stack+0x20/0x38 (C) [ 16.094637] dump_stack_lvl+0x8c/0xd0 [ 16.094754] print_report+0x118/0x608 [ 16.094920] kasan_report+0xdc/0x128 [ 16.094967] __kasan_check_byte+0x54/0x70 [ 16.095183] kfree_sensitive+0x30/0xb0 [ 16.095238] kmalloc_double_kzfree+0x168/0x308 [ 16.095285] kunit_try_run_case+0x170/0x3f0 [ 16.095337] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 16.095567] kthread+0x328/0x630 [ 16.095619] ret_from_fork+0x10/0x20 [ 16.095888] [ 16.095938] Allocated by task 192: [ 16.095974] kasan_save_stack+0x3c/0x68 [ 16.096061] kasan_save_track+0x20/0x40 [ 16.096178] kasan_save_alloc_info+0x40/0x58 [ 16.096219] __kasan_kmalloc+0xd4/0xd8 [ 16.096418] __kmalloc_cache_noprof+0x16c/0x3c0 [ 16.096597] kmalloc_double_kzfree+0xb8/0x308 [ 16.096654] kunit_try_run_case+0x170/0x3f0 [ 16.096694] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 16.096831] kthread+0x328/0x630 [ 16.096864] ret_from_fork+0x10/0x20 [ 16.096960] [ 16.096980] Freed by task 192: [ 16.097062] kasan_save_stack+0x3c/0x68 [ 16.097113] kasan_save_track+0x20/0x40 [ 16.097150] kasan_save_free_info+0x4c/0x78 [ 16.097190] __kasan_slab_free+0x6c/0x98 [ 16.097276] kfree+0x214/0x3c8 [ 16.097427] kfree_sensitive+0x80/0xb0 [ 16.097609] kmalloc_double_kzfree+0x11c/0x308 [ 16.097788] kunit_try_run_case+0x170/0x3f0 [ 16.097832] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 16.098143] kthread+0x328/0x630 [ 16.098555] ret_from_fork+0x10/0x20 [ 16.098604] [ 16.098624] The buggy address belongs to the object at fff00000c5ff7a40 [ 16.098624] which belongs to the cache kmalloc-16 of size 16 [ 16.098684] The buggy address is located 0 bytes inside of [ 16.098684] freed 16-byte region [fff00000c5ff7a40, fff00000c5ff7a50) [ 16.098784] [ 16.098827] The buggy address belongs to the physical page: [ 16.098861] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105ff7 [ 16.098915] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 16.099336] page_type: f5(slab) [ 16.099459] raw: 0bfffe0000000000 fff00000c0001640 dead000000000122 0000000000000000 [ 16.099533] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 16.099609] page dumped because: kasan: bad access detected [ 16.099957] [ 16.100050] Memory state around the buggy address: [ 16.100106] fff00000c5ff7900: fa fb fc fc fa fb fc fc fa fb fc fc 00 04 fc fc [ 16.100231] fff00000c5ff7980: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 16.100275] >fff00000c5ff7a00: fa fb fc fc fa fb fc fc fa fb fc fc fc fc fc fc [ 16.100313] ^ [ 16.100348] fff00000c5ff7a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 16.100389] fff00000c5ff7b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 16.100437] ==================================================================
[ 13.017800] ================================================================== [ 13.019319] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x19c/0x350 [ 13.019729] Read of size 1 at addr ffff888102749dc0 by task kunit_try_catch/209 [ 13.019976] [ 13.020401] CPU: 0 UID: 0 PID: 209 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc5 #1 PREEMPT(voluntary) [ 13.020489] Tainted: [B]=BAD_PAGE, [N]=TEST [ 13.020501] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 13.020686] Call Trace: [ 13.020703] <TASK> [ 13.020721] dump_stack_lvl+0x73/0xb0 [ 13.020879] print_report+0xd1/0x650 [ 13.020905] ? __virt_addr_valid+0x1db/0x2d0 [ 13.020929] ? kmalloc_double_kzfree+0x19c/0x350 [ 13.020952] ? kasan_complete_mode_report_info+0x64/0x200 [ 13.020975] ? kmalloc_double_kzfree+0x19c/0x350 [ 13.020999] kasan_report+0x141/0x180 [ 13.021020] ? kmalloc_double_kzfree+0x19c/0x350 [ 13.021047] ? kmalloc_double_kzfree+0x19c/0x350 [ 13.021070] __kasan_check_byte+0x3d/0x50 [ 13.021093] kfree_sensitive+0x22/0x90 [ 13.021116] kmalloc_double_kzfree+0x19c/0x350 [ 13.021139] ? __pfx_kmalloc_double_kzfree+0x10/0x10 [ 13.021163] ? __schedule+0x10cc/0x2b60 [ 13.021186] ? __pfx_read_tsc+0x10/0x10 [ 13.021208] ? ktime_get_ts64+0x86/0x230 [ 13.021233] kunit_try_run_case+0x1a5/0x480 [ 13.021258] ? __pfx_kunit_try_run_case+0x10/0x10 [ 13.021281] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 13.021305] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 13.021329] ? __kthread_parkme+0x82/0x180 [ 13.021385] ? preempt_count_sub+0x50/0x80 [ 13.021410] ? __pfx_kunit_try_run_case+0x10/0x10 [ 13.021451] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.021475] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 13.021500] kthread+0x337/0x6f0 [ 13.021519] ? trace_preempt_on+0x20/0xc0 [ 13.021542] ? __pfx_kthread+0x10/0x10 [ 13.021562] ? _raw_spin_unlock_irq+0x47/0x80 [ 13.021584] ? calculate_sigpending+0x7b/0xa0 [ 13.021608] ? __pfx_kthread+0x10/0x10 [ 13.021629] ret_from_fork+0x116/0x1d0 [ 13.021647] ? __pfx_kthread+0x10/0x10 [ 13.021667] ret_from_fork_asm+0x1a/0x30 [ 13.021699] </TASK> [ 13.021710] [ 13.036976] Allocated by task 209: [ 13.037476] kasan_save_stack+0x45/0x70 [ 13.038013] kasan_save_track+0x18/0x40 [ 13.038519] kasan_save_alloc_info+0x3b/0x50 [ 13.039256] __kasan_kmalloc+0xb7/0xc0 [ 13.039886] __kmalloc_cache_noprof+0x189/0x420 [ 13.040460] kmalloc_double_kzfree+0xa9/0x350 [ 13.041036] kunit_try_run_case+0x1a5/0x480 [ 13.041696] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.042164] kthread+0x337/0x6f0 [ 13.042292] ret_from_fork+0x116/0x1d0 [ 13.042657] ret_from_fork_asm+0x1a/0x30 [ 13.043242] [ 13.043719] Freed by task 209: [ 13.044144] kasan_save_stack+0x45/0x70 [ 13.044667] kasan_save_track+0x18/0x40 [ 13.044821] kasan_save_free_info+0x3f/0x60 [ 13.045423] __kasan_slab_free+0x56/0x70 [ 13.045865] kfree+0x222/0x3f0 [ 13.045994] kfree_sensitive+0x67/0x90 [ 13.046128] kmalloc_double_kzfree+0x12b/0x350 [ 13.046279] kunit_try_run_case+0x1a5/0x480 [ 13.046727] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.047599] kthread+0x337/0x6f0 [ 13.048033] ret_from_fork+0x116/0x1d0 [ 13.048536] ret_from_fork_asm+0x1a/0x30 [ 13.049706] [ 13.049880] The buggy address belongs to the object at ffff888102749dc0 [ 13.049880] which belongs to the cache kmalloc-16 of size 16 [ 13.050706] The buggy address is located 0 bytes inside of [ 13.050706] freed 16-byte region [ffff888102749dc0, ffff888102749dd0) [ 13.051137] [ 13.051235] The buggy address belongs to the physical page: [ 13.051645] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102749 [ 13.052020] flags: 0x200000000000000(node=0|zone=2) [ 13.052236] page_type: f5(slab) [ 13.052407] raw: 0200000000000000 ffff888100041640 dead000000000122 0000000000000000 [ 13.052716] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 13.053084] page dumped because: kasan: bad access detected [ 13.053311] [ 13.053494] Memory state around the buggy address: [ 13.053734] ffff888102749c80: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 13.054064] ffff888102749d00: 00 05 fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 13.054370] >ffff888102749d80: fa fb fc fc fa fb fc fc fa fb fc fc fc fc fc fc [ 13.054716] ^ [ 13.054937] ffff888102749e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.055150] ffff888102749e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.055505] ==================================================================