syzbot

 sign-in | mailing list | source | docs
🐞 Open [82] 🐞 Fixed [21] 🐞 Invalid [285] 📈 Kernel Health 📈 Bug Lifetimes 📈 Fuzzing 📈 Crashes 💬 Send us feedback

KASAN: use-after-free Write in enqueue_timer

Status: upstream: reported C repro on 2023/02/12 21:09
Reported-by: syzbot+2c452f99424f8e4e79a8@syzkaller.appspotmail.com
First crash: 446d, last: 1h00m
▶ ▼ Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: use-after-free Write in enqueue_timer net 1 536d 536d 22/26 fixed on 2023/02/24 13:50
android-5-15 KASAN: use-after-free Write in enqueue_timer 1 107d 107d 0/2 auto-obsoleted due to no activity on 2024/04/17 12:01
upstream KASAN: slab-use-after-free Write in enqueue_timer net 18 354d 369d 0/26 auto-obsoleted due to no activity on 2023/08/22 15:17
upstream KASAN: invalid-access Write in enqueue_timer ext4 20 1151d 1173d 0/26 auto-closed as invalid on 2021/07/08 00:48

Sample crash report:
==================================================================
BUG: KASAN: use-after-free in hlist_add_head include/linux/list.h:796 [inline]
BUG: KASAN: use-after-free in enqueue_timer+0xb7/0x300 kernel/time/timer.c:541
Write of size 8 at addr ffff8881ec4431c8 by task syz-executor266/1994

CPU: 0 PID: 1994 Comm: syz-executor266 Not tainted 5.4.242-syzkaller-00016-ga9527bd839f6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d8/0x241 lib/dump_stack.c:118
 print_address_description+0x8c/0x600 mm/kasan/report.c:384
 __kasan_report+0xf3/0x120 mm/kasan/report.c:516
 kasan_report+0x30/0x60 mm/kasan/common.c:653
 hlist_add_head include/linux/list.h:796 [inline]
 enqueue_timer+0xb7/0x300 kernel/time/timer.c:541
 __internal_add_timer kernel/time/timer.c:554 [inline]
 internal_add_timer+0x240/0x430 kernel/time/timer.c:604
 __mod_timer+0x6f1/0x13e0 kernel/time/timer.c:1065
 call_timer_fn+0x36/0x390 kernel/time/timer.c:1418
 expire_timers kernel/time/timer.c:1463 [inline]
 __run_timers+0x879/0xbe0 kernel/time/timer.c:1787
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1800
 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x195/0x1c0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:538 [inline]
 smp_apic_timer_interrupt+0x11a/0x460 arch/x86/kernel/apic/apic.c:1150
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
 </IRQ>

The buggy address belongs to the page:
page:ffffea0007b110c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x8000000000000000()
raw: 8000000000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x140dc0(GFP_USER|__GFP_COMP|__GFP_ZERO)
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook mm/page_alloc.c:2165 [inline]
 prep_new_page+0x18f/0x370 mm/page_alloc.c:2171
 get_page_from_freelist+0x2d13/0x2d90 mm/page_alloc.c:3794
 __alloc_pages_nodemask+0x393/0x840 mm/page_alloc.c:4891
 __alloc_pages include/linux/gfp.h:503 [inline]
 __alloc_pages_node include/linux/gfp.h:516 [inline]
 alloc_pages_node include/linux/gfp.h:530 [inline]
 kmalloc_order mm/slab_common.c:1342 [inline]
 kmalloc_order_trace+0x2a/0x100 mm/slab_common.c:1358
 kmalloc_large include/linux/slab.h:485 [inline]
 kmalloc include/linux/slab.h:549 [inline]
 kzalloc include/linux/slab.h:690 [inline]
 bpf_check+0xf6/0xb340 kernel/bpf/verifier.c:9556
 bpf_prog_load kernel/bpf/syscall.c:1724 [inline]
 __do_sys_bpf kernel/bpf/syscall.c:2891 [inline]
 __se_sys_bpf+0x8139/0xbcb0 kernel/bpf/syscall.c:2849
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1176 [inline]
 __free_pages_ok+0x847/0x950 mm/page_alloc.c:1438
 free_the_page mm/page_alloc.c:4953 [inline]
 __free_pages+0x91/0x140 mm/page_alloc.c:4959
 bpf_check+0x8aaa/0xb340 kernel/bpf/verifier.c:9726
 bpf_prog_load kernel/bpf/syscall.c:1724 [inline]
 __do_sys_bpf kernel/bpf/syscall.c:2891 [inline]
 __se_sys_bpf+0x8139/0xbcb0 kernel/bpf/syscall.c:2849
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

Memory state around the buggy address:
 ffff8881ec443080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881ec443100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8881ec443180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                              ^
 ffff8881ec443200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881ec443280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 0 P4D 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 630 Comm: syz-executor266 Tainted: G    B             5.4.242-syzkaller-00016-ga9527bd839f6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09d18 EFLAGS: 00010202
RAX: ffffffff8154cc2a RBX: 0000000000000101 RCX: ffff8881dc431f80
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881ec4431c0
RBP: ffff8881f6e09ec8 R08: ffffffff8154c86e R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 0000000100000c88
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881ec4431c0
FS:  00005555556da400(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001dc79d000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 call_timer_fn+0x36/0x390 kernel/time/timer.c:1418
 expire_timers kernel/time/timer.c:1463 [inline]
 __run_timers+0x879/0xbe0 kernel/time/timer.c:1787
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1800
 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x195/0x1c0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:538 [inline]
 smp_apic_timer_interrupt+0x11a/0x460 arch/x86/kernel/apic/apic.c:1150
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
 </IRQ>
Modules linked in:
CR2: 0000000000000000
---[ end trace 3a0f80b832eec789 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09d18 EFLAGS: 00010202
RAX: ffffffff8154cc2a RBX: 0000000000000101 RCX: ffff8881dc431f80
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881ec4431c0
RBP: ffff8881f6e09ec8 R08: ffffffff8154c86e R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 0000000100000c88
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881ec4431c0
FS:  00005555556da400(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001dc79d000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (3804):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/06/26 19:25 android12-5.4 a9527bd839f6 4cd5bb25 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/01/25 20:25 android12-5.4 4d7b888b5774 cc4a4020 .config console log report syz [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/05/04 11:52 android12-5.4 51cf29fc2bfc 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/05/04 08:11 android12-5.4 51cf29fc2bfc 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/05/04 05:01 android12-5.4 51cf29fc2bfc 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/05/04 03:37 android12-5.4 51cf29fc2bfc 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/05/03 14:41 android12-5.4 51cf29fc2bfc dd26401e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/05/03 13:03 android12-5.4 51cf29fc2bfc dd26401e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/05/03 05:57 android12-5.4 51cf29fc2bfc ddfc15a1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/05/02 23:01 android12-5.4 51cf29fc2bfc ddfc15a1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/05/02 15:18 android12-5.4 2d5d8240a7cb 3ba885bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/05/02 12:51 android12-5.4 2d5d8240a7cb 3ba885bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/05/02 08:56 android12-5.4 2d5d8240a7cb 3ba885bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/05/02 07:30 android12-5.4 2d5d8240a7cb 3ba885bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/05/02 02:11 android12-5.4 2d5d8240a7cb 3ba885bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/05/01 17:30 android12-5.4 2d5d8240a7cb 3ba885bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/05/01 12:19 android12-5.4 2d5d8240a7cb 3ba885bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/05/01 05:05 android12-5.4 2d5d8240a7cb 3ba885bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/04/30 21:30 android12-5.4 2d5d8240a7cb 3ce4924c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/04/30 19:39 android12-5.4 2d5d8240a7cb 3ce4924c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/04/30 12:49 android12-5.4 2d5d8240a7cb 3ce4924c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/04/29 22:58 android12-5.4 2d5d8240a7cb f10afd69 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/04/29 21:54 android12-5.4 2d5d8240a7cb f10afd69 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/04/29 10:53 android12-5.4 2d5d8240a7cb 27e33c58 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/04/29 08:34 android12-5.4 2d5d8240a7cb 27e33c58 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/04/29 05:41 android12-5.4 2d5d8240a7cb 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/04/28 10:25 android12-5.4 2d5d8240a7cb 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/04/28 03:23 android12-5.4 2d5d8240a7cb 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/04/27 17:53 android12-5.4 2d5d8240a7cb 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/04/27 03:32 android12-5.4 2d5d8240a7cb 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/04/27 00:20 android12-5.4 2d5d8240a7cb 059e9963 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/04/26 16:13 android12-5.4 2d5d8240a7cb 059e9963 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/04/26 13:12 android12-5.4 2d5d8240a7cb 059e9963 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/04/25 18:40 android12-5.4 2d5d8240a7cb 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/04/25 12:41 android12-5.4 2d5d8240a7cb 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/04/25 10:42 android12-5.4 2d5d8240a7cb 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/04/24 19:16 android12-5.4 2d5d8240a7cb 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/04/24 16:45 android12-5.4 2d5d8240a7cb 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/04/24 12:19 android12-5.4 2d5d8240a7cb 21339d7b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/04/24 09:54 android12-5.4 2d5d8240a7cb 21339d7b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2023/02/12 21:08 android12-5.4 6a5ec6cea0cd 93e26d60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: use-after-free Write in enqueue_timer
2024/05/03 03:12 android12-5.4 51cf29fc2bfc ddfc15a1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: slab-out-of-bounds Write in enqueue_timer
2024/05/03 01:59 android12-5.4 51cf29fc2bfc ddfc15a1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: slab-out-of-bounds Write in enqueue_timer
2024/05/01 23:59 android12-5.4 2d5d8240a7cb 3ba885bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: slab-out-of-bounds Write in enqueue_timer
2024/05/01 18:33 android12-5.4 2d5d8240a7cb 3ba885bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: slab-out-of-bounds Write in enqueue_timer
2024/04/29 00:01 android12-5.4 2d5d8240a7cb 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: slab-out-of-bounds Write in enqueue_timer
2024/04/27 21:51 android12-5.4 2d5d8240a7cb 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: slab-out-of-bounds Write in enqueue_timer
2024/04/25 06:53 android12-5.4 2d5d8240a7cb 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: slab-out-of-bounds Write in enqueue_timer
2024/02/25 23:23 android12-5.4 1b3143b9b166 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan BUG: unable to handle kernel paging request in enqueue_timer
2024/02/05 12:41 android12-5.4 bf4c80bc4358 e23e8c20 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: slab-out-of-bounds Write in enqueue_timer
2023/10/17 11:21 android12-5.4 5f1cbd78af59 342b9c55 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-perf-kasan KASAN: out-of-bounds Write in enqueue_timer
* Struck through repros no longer work on HEAD.