Hay
Date
June 18, 2025, 6:43 a.m.

Environment
qemu-arm64
qemu-x86_64

[   21.658876] ==================================================================
[   21.659533] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x64/0x70
[   21.659630] Read of size 4 at addr fff00000c63e1f00 by task swapper/0/0
[   21.659680] 
[   21.659725] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G    B   W        N  6.16.0-rc2-next-20250618 #1 PREEMPT 
[   21.659822] Tainted: [B]=BAD_PAGE, [W]=WARN, [N]=TEST
[   21.659852] Hardware name: linux,dummy-virt (DT)
[   21.659885] Call trace:
[   21.659921]  show_stack+0x20/0x38 (C)
[   21.660264]  dump_stack_lvl+0x8c/0xd0
[   21.660347]  print_report+0x118/0x608
[   21.660994]  kasan_report+0xdc/0x128
[   21.661092]  __asan_report_load4_noabort+0x20/0x30
[   21.661149]  rcu_uaf_reclaim+0x64/0x70
[   21.661202]  rcu_core+0x9f4/0x1e20
[   21.661255]  rcu_core_si+0x18/0x30
[   21.661302]  handle_softirqs+0x374/0xb28
[   21.661353]  __do_softirq+0x1c/0x28
[   21.661403]  ____do_softirq+0x18/0x30
[   21.661463]  call_on_irq_stack+0x24/0x30
[   21.661513]  do_softirq_own_stack+0x24/0x38
[   21.661568]  __irq_exit_rcu+0x1fc/0x318
[   21.661620]  irq_exit_rcu+0x1c/0x80
[   21.661664]  el1_interrupt+0x38/0x58
[   21.661717]  el1h_64_irq_handler+0x18/0x28
[   21.661766]  el1h_64_irq+0x6c/0x70
[   21.661897]  arch_local_irq_enable+0x4/0x8 (P)
[   21.661952]  do_idle+0x384/0x4e8
[   21.661996]  cpu_startup_entry+0x68/0x80
[   21.662680]  rest_init+0x160/0x188
[   21.662772]  start_kernel+0x30c/0x3d0
[   21.662836]  __primary_switched+0x8c/0xa0
[   21.662894] 
[   21.662915] Allocated by task 208:
[   21.662948]  kasan_save_stack+0x3c/0x68
[   21.662996]  kasan_save_track+0x20/0x40
[   21.663058]  kasan_save_alloc_info+0x40/0x58
[   21.663103]  __kasan_kmalloc+0xd4/0xd8
[   21.663141]  __kmalloc_cache_noprof+0x16c/0x3c0
[   21.663184]  rcu_uaf+0xb0/0x2d8
[   21.663218]  kunit_try_run_case+0x170/0x3f0
[   21.663258]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   21.663300]  kthread+0x328/0x630
[   21.663336]  ret_from_fork+0x10/0x20
[   21.663372] 
[   21.663394] Freed by task 0:
[   21.663435]  kasan_save_stack+0x3c/0x68
[   21.663497]  kasan_save_track+0x20/0x40
[   21.663538]  kasan_save_free_info+0x4c/0x78
[   21.663619]  __kasan_slab_free+0x6c/0x98
[   21.663693]  kfree+0x214/0x3c8
[   21.663737]  rcu_uaf_reclaim+0x28/0x70
[   21.663810]  rcu_core+0x9f4/0x1e20
[   21.663897]  rcu_core_si+0x18/0x30
[   21.663938]  handle_softirqs+0x374/0xb28
[   21.663976]  __do_softirq+0x1c/0x28
[   21.664012] 
[   21.664054] Last potentially related work creation:
[   21.664084]  kasan_save_stack+0x3c/0x68
[   21.664126]  kasan_record_aux_stack+0xb4/0xc8
[   21.664168]  __call_rcu_common.constprop.0+0x74/0x8c8
[   21.664212]  call_rcu+0x18/0x30
[   21.664261]  rcu_uaf+0x14c/0x2d8
[   21.664304]  kunit_try_run_case+0x170/0x3f0
[   21.664346]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   21.664394]  kthread+0x328/0x630
[   21.664429]  ret_from_fork+0x10/0x20
[   21.664468] 
[   21.664490] The buggy address belongs to the object at fff00000c63e1f00
[   21.664490]  which belongs to the cache kmalloc-32 of size 32
[   21.664586] The buggy address is located 0 bytes inside of
[   21.664586]  freed 32-byte region [fff00000c63e1f00, fff00000c63e1f20)
[   21.664669] 
[   21.664695] The buggy address belongs to the physical page:
[   21.664815] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1063e1
[   21.665125] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   21.665411] page_type: f5(slab)
[   21.665579] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000
[   21.665674] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000
[   21.665839] page dumped because: kasan: bad access detected
[   21.665882] 
[   21.665904] Memory state around the buggy address:
[   21.666125]  fff00000c63e1e00: 00 00 00 fc fc fc fc fc 00 00 05 fc fc fc fc fc
[   21.666273]  fff00000c63e1e80: 00 00 07 fc fc fc fc fc fa fb fb fb fc fc fc fc
[   21.666345] >fff00000c63e1f00: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
[   21.666384]                    ^
[   21.666416]  fff00000c63e1f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   21.666461]  fff00000c63e2000: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
[   21.666722] ==================================================================

[   11.709547] ==================================================================
[   11.709962] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x50/0x60
[   11.710313] Read of size 4 at addr ffff88810387aa80 by task swapper/1/0
[   11.710641] 
[   11.710840] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G    B            N  6.16.0-rc2-next-20250618 #1 PREEMPT(voluntary) 
[   11.710888] Tainted: [B]=BAD_PAGE, [N]=TEST
[   11.710900] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   11.710920] Call Trace:
[   11.710946]  <IRQ>
[   11.710962]  dump_stack_lvl+0x73/0xb0
[   11.710992]  print_report+0xd1/0x650
[   11.711013]  ? __virt_addr_valid+0x1db/0x2d0
[   11.711034]  ? rcu_uaf_reclaim+0x50/0x60
[   11.711066]  ? kasan_complete_mode_report_info+0x64/0x200
[   11.711092]  ? rcu_uaf_reclaim+0x50/0x60
[   11.711112]  kasan_report+0x141/0x180
[   11.711144]  ? rcu_uaf_reclaim+0x50/0x60
[   11.711168]  __asan_report_load4_noabort+0x18/0x20
[   11.711192]  rcu_uaf_reclaim+0x50/0x60
[   11.711220]  rcu_core+0x66f/0x1c40
[   11.711248]  ? __pfx_rcu_core+0x10/0x10
[   11.711268]  ? ktime_get+0x6b/0x150
[   11.711289]  ? handle_softirqs+0x18e/0x730
[   11.711322]  rcu_core_si+0x12/0x20
[   11.711341]  handle_softirqs+0x209/0x730
[   11.711360]  ? hrtimer_interrupt+0x2fe/0x780
[   11.711392]  ? __pfx_handle_softirqs+0x10/0x10
[   11.711416]  __irq_exit_rcu+0xc9/0x110
[   11.711472]  irq_exit_rcu+0x12/0x20
[   11.711505]  sysvec_apic_timer_interrupt+0x81/0x90
[   11.711529]  </IRQ>
[   11.711556]  <TASK>
[   11.711566]  asm_sysvec_apic_timer_interrupt+0x1f/0x30
[   11.711666] RIP: 0010:pv_native_safe_halt+0xf/0x20
[   11.711878] Code: 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d 63 38 1f 00 fb f4 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
[   11.711966] RSP: 0000:ffff888100877dc8 EFLAGS: 00010216
[   11.712051] RAX: ffff8881cc367000 RBX: ffff888100853000 RCX: ffffffff85e98285
[   11.712096] RDX: ffffed102a8e6193 RSI: 0000000000000004 RDI: 000000000001a57c
[   11.712137] RBP: ffff888100877dd0 R08: 0000000000000001 R09: ffffed102a8e6192
[   11.712183] R10: ffff888154730c93 R11: 0000000000010000 R12: 0000000000000001
[   11.712236] R13: ffffed102010a600 R14: ffffffff87bb8990 R15: 0000000000000000
[   11.712294]  ? ct_kernel_exit.constprop.0+0xa5/0xd0
[   11.712345]  ? default_idle+0xd/0x20
[   11.712365]  arch_cpu_idle+0xd/0x20
[   11.712385]  default_idle_call+0x48/0x80
[   11.712406]  do_idle+0x379/0x4f0
[   11.712431]  ? __pfx_do_idle+0x10/0x10
[   11.712451]  ? _raw_spin_unlock_irqrestore+0x49/0x90
[   11.712472]  ? complete+0x15b/0x1d0
[   11.712493]  cpu_startup_entry+0x5c/0x70
[   11.712516]  start_secondary+0x211/0x290
[   11.712537]  ? __pfx_start_secondary+0x10/0x10
[   11.712561]  common_startup_64+0x13e/0x148
[   11.712591]  </TASK>
[   11.712601] 
[   11.726334] Allocated by task 224:
[   11.726801]  kasan_save_stack+0x45/0x70
[   11.727013]  kasan_save_track+0x18/0x40
[   11.727180]  kasan_save_alloc_info+0x3b/0x50
[   11.727380]  __kasan_kmalloc+0xb7/0xc0
[   11.727816]  __kmalloc_cache_noprof+0x189/0x420
[   11.727979]  rcu_uaf+0xb0/0x330
[   11.728415]  kunit_try_run_case+0x1a5/0x480
[   11.728776]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   11.728999]  kthread+0x337/0x6f0
[   11.729176]  ret_from_fork+0x116/0x1d0
[   11.729350]  ret_from_fork_asm+0x1a/0x30
[   11.729560] 
[   11.729738] Freed by task 0:
[   11.729840]  kasan_save_stack+0x45/0x70
[   11.730019]  kasan_save_track+0x18/0x40
[   11.730199]  kasan_save_free_info+0x3f/0x60
[   11.730883]  __kasan_slab_free+0x56/0x70
[   11.731051]  kfree+0x222/0x3f0
[   11.731413]  rcu_uaf_reclaim+0x1f/0x60
[   11.731891]  rcu_core+0x66f/0x1c40
[   11.732064]  rcu_core_si+0x12/0x20
[   11.732261]  handle_softirqs+0x209/0x730
[   11.732481]  __irq_exit_rcu+0xc9/0x110
[   11.732671]  irq_exit_rcu+0x12/0x20
[   11.733202]  sysvec_apic_timer_interrupt+0x81/0x90
[   11.733621]  asm_sysvec_apic_timer_interrupt+0x1f/0x30
[   11.733808] 
[   11.733917] Last potentially related work creation:
[   11.734153]  kasan_save_stack+0x45/0x70
[   11.734355]  kasan_record_aux_stack+0xb2/0xc0
[   11.734961]  __call_rcu_common.constprop.0+0x7b/0x9e0
[   11.735151]  call_rcu+0x12/0x20
[   11.735487]  rcu_uaf+0x168/0x330
[   11.735903]  kunit_try_run_case+0x1a5/0x480
[   11.736080]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   11.736491]  kthread+0x337/0x6f0
[   11.736667]  ret_from_fork+0x116/0x1d0
[   11.737047]  ret_from_fork_asm+0x1a/0x30
[   11.737455] 
[   11.737564] The buggy address belongs to the object at ffff88810387aa80
[   11.737564]  which belongs to the cache kmalloc-32 of size 32
[   11.738415] The buggy address is located 0 bytes inside of
[   11.738415]  freed 32-byte region [ffff88810387aa80, ffff88810387aaa0)
[   11.739066] 
[   11.739163] The buggy address belongs to the physical page:
[   11.739723] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10387a
[   11.740184] flags: 0x200000000000000(node=0|zone=2)
[   11.740549] page_type: f5(slab)
[   11.740756] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000
[   11.741399] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000
[   11.742096] page dumped because: kasan: bad access detected
[   11.742377] 
[   11.742706] Memory state around the buggy address:
[   11.743311]  ffff88810387a980: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc
[   11.743633]  ffff88810387aa00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   11.744070] >ffff88810387aa80: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
[   11.744780]                    ^
[   11.744906]  ffff88810387ab00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   11.745387]  ffff88810387ab80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   11.745848] ==================================================================