* [BUG] NVMe: KASAN slab-use-after-free in __run_timer_base
@ 2026-10-18 20:54 Shuangpeng Bai
0 siblings, 0 replies; only message in thread
From: Shuangpeng Bai @ 2026-10-18 20:54 UTC (permalink / raw)
To: Keith Busch, Jens Axboe, Christoph Hellwig, Sagi Grimberg
Cc: Shuangpeng Bai, linux-nvme, linux-kernel
Hi Kernel Maintainers,
I hit the following report while testing current upstream kernel:
KASAN: slab-use-after-free in __run_timer_base
on commit: 58161ead29e50d70a317ea26b472e0c7508e69da (2026-10-16)
To help trigger the bug more reliably, we applied a minimal diagnostic patch
that only adds delays and print statements.
The reproducer and .config files are here.
https://gist.github.com/shuangpengbai/353855e21730d39b56943359215df2f8
I'm happy to test debug patches or provide additional information.
Reported-by: Shuangpeng Bai <shuangpeng.kernel@gmail.com>
[ 97.002406] ==================================================================
[ 97.002426] BUG: KASAN: slab-use-after-free in __run_timer_base (include/linux/list.h:1175 kernel/time/timer.c:1820 kernel/time/timer.c:2356 kernel/time/timer.c:2386)
[ 97.002500] Write of size 8 at addr ffff88811d710e40 by task swapper/0/0
[ 97.002533] Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 97.002541] Call Trace:
[ 97.002547] <IRQ>
[ 97.002552] dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[ 97.002567] print_report (mm/kasan/report.c:378 mm/kasan/report.c:482)
[ 97.002602] kasan_report (mm/kasan/report.c:595)
[ 97.002628] __run_timer_base (include/linux/list.h:1175 kernel/time/timer.c:1820 kernel/time/timer.c:2356 kernel/time/timer.c:2386)
[ 97.002682] tmigr_handle_remote (kernel/time/timer_migration.c:985 kernel/time/timer_migration.c:1076 kernel/time/timer_migration.c:564 kernel/time/timer_migration.c:581 kernel/time/timer_migration.c:1135)
[ 97.002742] handle_softirqs (kernel/softirq.c:645)
[ 97.002757] __irq_exit_rcu (kernel/softirq.c:679 kernel/softirq.c:519 kernel/softirq.c:758)
[ 97.002768] sysvec_apic_timer_interrupt (archkernel/apic/apic.c:1062 archkernel/apic/apic.c:1062)
[ 97.002783] </IRQ>
[ 97.002787] <TASK>
[ 97.002791] asm_sysvec_apic_timer_interrupt (archinclude/asm/idtentry.h:674)
[ 97.002802] RIP: 0010:pv_native_safe_halt (archinclude/asm/irqflags.h:48 archkernel/paravirt.c:63)
[ 97.002818] Code: 83 fa 01 00 cc 66 90 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 55 5c 19 00 f3 0f 1e fa fb f4 <e9> 58 fa 01 00 cc 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90
All code
========
0: 83 fa 01 cmp $0x1,%edx
3: 00 cc add %cl,%ah
5: 66 90 xchg %ax,%ax
7: 90 nop
8: 90 nop
9: 90 nop
a: 90 nop
b: 90 nop
c: 90 nop
d: 90 nop
e: 90 nop
f: 90 nop
10: 90 nop
11: 90 nop
12: 90 nop
13: 90 nop
14: 90 nop
15: 90 nop
16: 90 nop
17: f3 0f 1e fa endbr64
1b: eb 07 jmp 0x24
1d: 0f 00 2d 55 5c 19 00 verw 0x195c55(%rip) # 0x195c79
24: f3 0f 1e fa endbr64
28: fb sti
29: f4 hlt
2a:* e9 58 fa 01 00 jmp 0x1fa87 <-- trapping instruction
2f: cc int3
30: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)
37: 90 nop
38: 90 nop
39: 90 nop
3a: 90 nop
3b: 90 nop
3c: 90 nop
3d: 90 nop
3e: 90 nop
3f: 90 nop
Code starting with the faulting instruction
===========================================
0: e9 58 fa 01 00 jmp 0x1fa5d
5: cc int3
6: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)
d: 90 nop
e: 90 nop
f: 90 nop
10: 90 nop
11: 90 nop
12: 90 nop
13: 90 nop
14: 90 nop
15: 90 nop
[ 97.002826] RSP: 0018:ffffffff85607ce8 EFLAGS: 00000206
[ 97.002839] RAX: ffff8882d1236000 RBX: ffffffff85615880 RCX: ffffffff846b6184
[ 97.002847] RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000017cc4
[ 97.002854] RBP: ffffffff85607db8 R08: ffff888258030f8b R09: 1ffff1104b0061f1
[ 97.002860] R10: dffffc0000000000 R11: ffffed104b0061f2 R12: 0000000000000000
[ 97.002866] R13: 1ffffffff0ac2b10 R14: 0000000000000000 R15: dffffc0000000000
[ 97.002884] default_idle (archkernel/process.c:767 archkernel/process.c:768)
[ 97.002893] default_idle_call (kernel/sched/idle.c:122)
[ 97.002902] do_idle (kernel/sched/idle.c:199 kernel/sched/idle.c:355)
[ 97.002934] cpu_startup_entry (kernel/sched/idle.c:454)
[ 97.002945] rest_init (init/main.c:732)
[ 97.002987] start_kernel (init/main.c:1190)
[ 97.002999] x86_64_start_reservations (archkernel/head64.c:310)
[ 97.003060] x86_64_start_kernel (archkernel/head64.c:291)
[ 97.003073] common_startup_64 (archkernel/head_64.S:418)
[ 97.003088] </TASK>
[ 97.003095] Allocated by task 380 on cpu 1 at 16.265072s:
[ 97.003104] kasan_save_track (mm/kasan/common.c:57 mm/kasan/common.c:78)
[ 97.003116] __kasan_kmalloc (mm/kasan/common.c:409 mm/kasan/common.c:426)
[ 97.003125] nvme_rdma_create_ctrl (include/linux/slab.h:991 include/linux/slab.h:1312 drivers/nvme/host/rdma.c:2289 drivers/nvme/host/rdma.c:2367)
[ 97.003138] nvmf_dev_write (drivers/nvme/host/fabrics.c:1361 drivers/nvme/host/fabrics.c:1408)
[ 97.003148] vfs_write (fs/read_write.c:685)
[ 97.003157] ksys_write (fs/read_write.c:739)
[ 97.003166] do_syscall_64 (arch/x86/entry/syscall_64.c:61 arch/x86/entry/syscall_64.c:84)
[ 97.003175] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[ 97.003186] Freed by task 26 on cpu 0 at 76.560994s:
[ 97.003193] kasan_save_track (mm/kasan/common.c:57 mm/kasan/common.c:78)
[ 97.003202] kasan_save_free_info (mm/kasan/generic.c:584)
[ 97.003210] __kasan_slab_free (mm/kasan/common.c:264 mm/kasan/common.c:296)
[ 97.003220] kfree (include/linux/kasan.h:235 mm/slub.c:2748 mm/slub.c:6509 mm/slub.c:6802)
[ 97.003230] nvme_free_ctrl (drivers/nvme/host/core.c:5202)
[ 97.003240] device_release (drivers/base/core.c:?)
[ 97.003251] kobject_put (lib/kobject.c:689 lib/kobject.c:720 include/linux/kref.h:65 lib/kobject.c:737)
[ 97.003263] process_scheduled_works (kernel/workqueue.c:3396 kernel/workqueue.c:3479)
[ 97.003272] worker_thread (kernel/workqueue.c:3560)
[ 97.003281] kthread (kernel/kthread.c:436)
[ 97.003291] ret_from_fork (archkernel/process.c:158)
[ 97.003304] ret_from_fork_asm (arch/x86/entry/entry_64.S:245)
[ 97.003316] Last potentially related work creation:
[ 97.003320] kasan_save_stack (mm/kasan/common.c:57)
[ 97.003330] kasan_record_aux_stack (mm/kasan/generic.c:556)
[ 97.003338] insert_work (kernel/workqueue.c:2272)
[ 97.003345] __queue_work (kernel/workqueue.c:2448)
[ 97.003356] queue_work_on (kernel/workqueue.c:2501)
[ 97.003364] nvme_delete_ctrl (include/linux/workqueue.h:700 drivers/nvme/host/core.c:268)
[ 97.003376] process_scheduled_works (kernel/workqueue.c:3396 kernel/workqueue.c:3479)
[ 97.003384] worker_thread (kernel/workqueue.c:3560)
[ 97.003392] kthread (kernel/kthread.c:436)
[ 97.003401] ret_from_fork (archkernel/process.c:158)
[ 97.003411] ret_from_fork_asm (arch/x86/entry/entry_64.S:245)
[ 97.003422] Second to last potentially related work creation:
[ 97.003427] kasan_save_stack (mm/kasan/common.c:57)
[ 97.003435] kasan_record_aux_stack (mm/kasan/generic.c:556)
[ 97.003442] insert_work (kernel/workqueue.c:2272)
[ 97.003449] __queue_work (kernel/workqueue.c:2448)
[ 97.003457] call_timer_fn (kernel/time/timer.c:1748)
[ 97.003470] __run_timer_base (kernel/time/timer.c:1794 kernel/time/timer.c:2374 kernel/time/timer.c:2386)
[ 97.003480] tmigr_handle_remote (kernel/time/timer_migration.c:985 kernel/time/timer_migration.c:1076 kernel/time/timer_migration.c:564 kernel/time/timer_migration.c:581 kernel/time/timer_migration.c:1135)
[ 97.003492] handle_softirqs (kernel/softirq.c:645)
[ 97.003502] __irq_exit_rcu (kernel/softirq.c:679 kernel/softirq.c:519 kernel/softirq.c:758)
[ 97.003512] sysvec_apic_timer_interrupt (archkernel/apic/apic.c:1062 archkernel/apic/apic.c:1062)
[ 97.003523] asm_sysvec_apic_timer_interrupt (archinclude/asm/idtentry.h:674)
[ 97.003534] The buggy address belongs to the object at ffff88811d710000
which belongs to the cache kmalloc-4k of size 4096
[ 97.003542] The buggy address is located 3648 bytes inside of
freed 4096-byte region [ffff88811d710000, ffff88811d711000)
Best,
Shuangpeng
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