[moderation] [hams?] KASAN: slab-use-after-free Write in rose_t0timer_expiry
0 views
Skip to first unread message
syzbot
Sep 23, 2025, 11:46:35 PM (2 days ago) Sep 23
to syzkaller-upst...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: e8442d5b7bc6 Merge tag 'sound-6.17-rc7' of git://git.kerne..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1444b0e2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=8f01d8629880e620
dashboard link: https://syzkaller.appspot.com/bug?extid=330554ecdf9d30b4f999
compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
CC: [da...@davemloft.net edum...@google.com ho...@kernel.org ku...@kernel.org linux...@vger.kernel.org linux-...@vger.kernel.org net...@vger.kernel.org pab...@redhat.com]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a710a41115b6/disk-e8442d5b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/cf50d7099eff/vmlinux-e8442d5b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/48cf00216bb5/bzImage-e8442d5b.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+330554...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in rose_t0timer_expiry+0x114/0x150 net/rose/rose_link.c:85
Write of size 1 at addr ffff8880569e3435 by task syz.3.1212/10695
CPU: 0 UID: 0 PID: 10695 Comm: syz.3.1212 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xcd/0x630 mm/kasan/report.c:482
kasan_report+0xe0/0x110 mm/kasan/report.c:595
rose_t0timer_expiry+0x114/0x150 net/rose/rose_link.c:85
call_timer_fn+0x197/0x620 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers+0x6ef/0x960 kernel/time/timer.c:2372
__run_timer_base kernel/time/timer.c:2384 [inline]
__run_timer_base kernel/time/timer.c:2376 [inline]
run_timer_base+0x114/0x190 kernel/time/timer.c:2393
run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2403
handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_release+0x183/0x2f0 kernel/locking/lockdep.c:5893
Code: 0f c1 05 f8 4d 3f 12 83 f8 01 0f 85 1d 01 00 00 9c 58 f6 c4 02 0f 85 08 01 00 00 41 f7 c5 00 02 00 00 74 01 fb 48 8b 44 24 10 <65> 48 2b 05 0d 0c 3f 12 0f 85 58 01 00 00 48 83 c4 18 5b 41 5c 41
RSP: 0018:ffffc9000458eef0 EFLAGS: 00000206
RAX: 6a3b0bf03f2b6b00 RBX: ffffffff8e5c15a0 RCX: ffffc9000458eefc
RDX: 0000000000000000 RSI: ffffffff8de2d7a0 RDI: ffffffff8c163380
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000006b1a R12: ffffffff816af8a4
R13: 0000000000000202 R14: ffff888079510000 R15: 0000000000000001
rcu_lock_release include/linux/rcupdate.h:341 [inline]
rcu_read_unlock include/linux/rcupdate.h:871 [inline]
class_rcu_destructor include/linux/rcupdate.h:1155 [inline]
unwind_next_frame+0x3f9/0x20a0 arch/x86/kernel/unwind_orc.c:479
__unwind_start+0x45f/0x7f0 arch/x86/kernel/unwind_orc.c:758
unwind_start arch/x86/include/asm/unwind.h:64 [inline]
arch_stack_walk+0x73/0x100 arch/x86/kernel/stacktrace.c:24
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
save_stack+0x160/0x1f0 mm/page_owner.c:156
__reset_page_owner+0x84/0x1a0 mm/page_owner.c:308
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1395 [inline]
free_unref_folios+0xa61/0x16b0 mm/page_alloc.c:2952
folios_put_refs+0x56f/0x740 mm/swap.c:999
folio_batch_release include/linux/pagevec.h:101 [inline]
shmem_undo_range+0x58f/0x1150 mm/shmem.c:1157
shmem_truncate_range mm/shmem.c:1269 [inline]
shmem_evict_inode+0x3a1/0xbe0 mm/shmem.c:1397
evict+0x3e3/0x920 fs/inode.c:810
iput_final fs/inode.c:1897 [inline]
iput fs/inode.c:1923 [inline]
iput+0x521/0x880 fs/inode.c:1909
dentry_unlink_inode+0x29c/0x480 fs/dcache.c:466
__dentry_kill+0x1d0/0x600 fs/dcache.c:669
dput.part.0+0x4b1/0x9b0 fs/dcache.c:911
dput+0x1f/0x30 fs/dcache.c:901
__fput+0x51c/0xb70 fs/file_table.c:476
task_work_run+0x150/0x240 kernel/task_work.c:227
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0x86f/0x2bf0 kernel/exit.c:961
do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
get_signal+0x2673/0x26d0 kernel/signal.c:3034
arch_do_signal_or_restart+0x8f/0x7d0 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop+0x84/0x110 kernel/entry/common.c:40
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x41c/0x4e0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6ae558ec29
Code: Unable to access opcode bytes at 0x7f6ae558ebff.
RSP: 002b:00007f6ae6354038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: 0000000000010106 RBX: 00007f6ae57d6090 RCX: 00007f6ae558ec29
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007f6ae5611e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6ae57d6128 R14: 00007f6ae57d6090 R15: 00007ffc44639248
</TASK>
Allocated by task 7892:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:388 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:405
kmalloc_noprof include/linux/slab.h:905 [inline]
rose_add_node net/rose/rose_route.c:85 [inline]
rose_rt_ioctl+0x880/0x2580 net/rose/rose_route.c:748
rose_ioctl+0x64d/0x7d0 net/rose/af_rose.c:1381
sock_do_ioctl+0x118/0x280 net/socket.c:1238
sock_ioctl+0x227/0x6b0 net/socket.c:1359
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:598 [inline]
__se_sys_ioctl fs/ioctl.c:584 [inline]
__x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:584
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 10720:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:243 [inline]
__kasan_slab_free+0x60/0x70 mm/kasan/common.c:275
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2422 [inline]
slab_free mm/slub.c:4695 [inline]
kfree+0x2b4/0x4d0 mm/slub.c:4894
rose_neigh_put include/net/rose.h:166 [inline]
rose_timer_expiry+0x53f/0x630 net/rose/rose_timer.c:183
call_timer_fn+0x197/0x620 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers+0x6ef/0x960 kernel/time/timer.c:2372
__run_timer_base kernel/time/timer.c:2384 [inline]
__run_timer_base kernel/time/timer.c:2376 [inline]
run_timer_base+0x114/0x190 kernel/time/timer.c:2393
run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2403
handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
The buggy address belongs to the object at ffff8880569e3400
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 53 bytes inside of
freed 512-byte region [ffff8880569e3400, ffff8880569e3600)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x569e0
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b841c80 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b841c80 0000000000000000 dead000000000001
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea00015a7801 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5844, tgid 5844 (syz-executor), ts 66287574491, free_ts 15197057508
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1851
prep_new_page mm/page_alloc.c:1859 [inline]
get_page_from_freelist+0x132b/0x38e0 mm/page_alloc.c:3858
__alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:5148
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:2492 [inline]
allocate_slab mm/slub.c:2660 [inline]
new_slab+0x247/0x330 mm/slub.c:2714
___slab_alloc+0xcf2/0x1750 mm/slub.c:3901
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3992
__slab_alloc_node mm/slub.c:4067 [inline]
slab_alloc_node mm/slub.c:4228 [inline]
__kmalloc_cache_noprof+0xfb/0x3e0 mm/slub.c:4402
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
mca_alloc net/ipv6/mcast.c:876 [inline]
__ipv6_dev_mc_inc+0x2f1/0xbc0 net/ipv6/mcast.c:966
br_ip6_multicast_join_snoopers net/bridge/br_multicast.c:4183 [inline]
br_multicast_join_snoopers+0xcb/0x120 net/bridge/br_multicast.c:4194
br_dev_open+0x112/0x150 net/bridge/br_device.c:174
__dev_open+0x2e7/0x7c0 net/core/dev.c:1682
__dev_change_flags+0x55d/0x720 net/core/dev.c:9549
netif_change_flags+0x8d/0x160 net/core/dev.c:9612
do_setlink.constprop.0+0xb53/0x4380 net/core/rtnetlink.c:3143
rtnl_changelink net/core/rtnetlink.c:3761 [inline]
__rtnl_newlink net/core/rtnetlink.c:3920 [inline]
rtnl_newlink+0x1446/0x2000 net/core/rtnetlink.c:4057
page last free pid 1 tgid 1 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1395 [inline]
__free_frozen_pages+0x7d5/0x10f0 mm/page_alloc.c:2895
__free_pages mm/page_alloc.c:5260 [inline]
free_contig_range+0x183/0x4b0 mm/page_alloc.c:7091
destroy_args+0x794/0xc10 mm/debug_vm_pgtable.c:958
debug_vm_pgtable+0x1a32/0x3640 mm/debug_vm_pgtable.c:1345
do_one_initcall+0x120/0x6e0 init/main.c:1269
do_initcall_level init/main.c:1331 [inline]
do_initcalls init/main.c:1347 [inline]
do_basic_setup init/main.c:1366 [inline]
kernel_init_freeable+0x5c2/0x910 init/main.c:1579
kernel_init+0x1c/0x2b0 init/main.c:1469
ret_from_fork+0x56a/0x730 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Memory state around the buggy address:
ffff8880569e3300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880569e3380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880569e3400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880569e3480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880569e3500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 0f c1 05 f8 4d 3f 12 xadd %eax,0x123f4df8(%rip) # 0x123f4dff
7: 83 f8 01 cmp $0x1,%eax
a: 0f 85 1d 01 00 00 jne 0x12d
10: 9c pushf
11: 58 pop %rax
12: f6 c4 02 test $0x2,%ah
15: 0f 85 08 01 00 00 jne 0x123
1b: 41 f7 c5 00 02 00 00 test $0x200,%r13d
22: 74 01 je 0x25
24: fb sti
25: 48 8b 44 24 10 mov 0x10(%rsp),%rax
* 2a: 65 48 2b 05 0d 0c 3f sub %gs:0x123f0c0d(%rip),%rax # 0x123f0c3f <-- trapping instruction
31: 12
32: 0f 85 58 01 00 00 jne 0x190
38: 48 83 c4 18 add $0x18,%rsp
3c: 5b pop %rbx
3d: 41 5c pop %r12
3f: 41 rex.B
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: e8442d5b7bc6 Merge tag 'sound-6.17-rc7' of git://git.kerne..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1444b0e2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=8f01d8629880e620
dashboard link: https://syzkaller.appspot.com/bug?extid=330554ecdf9d30b4f999
compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
CC: [da...@davemloft.net edum...@google.com ho...@kernel.org ku...@kernel.org linux...@vger.kernel.org linux-...@vger.kernel.org net...@vger.kernel.org pab...@redhat.com]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a710a41115b6/disk-e8442d5b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/cf50d7099eff/vmlinux-e8442d5b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/48cf00216bb5/bzImage-e8442d5b.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+330554...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in rose_t0timer_expiry+0x114/0x150 net/rose/rose_link.c:85
Write of size 1 at addr ffff8880569e3435 by task syz.3.1212/10695
CPU: 0 UID: 0 PID: 10695 Comm: syz.3.1212 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xcd/0x630 mm/kasan/report.c:482
kasan_report+0xe0/0x110 mm/kasan/report.c:595
rose_t0timer_expiry+0x114/0x150 net/rose/rose_link.c:85
call_timer_fn+0x197/0x620 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers+0x6ef/0x960 kernel/time/timer.c:2372
__run_timer_base kernel/time/timer.c:2384 [inline]
__run_timer_base kernel/time/timer.c:2376 [inline]
run_timer_base+0x114/0x190 kernel/time/timer.c:2393
run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2403
handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_release+0x183/0x2f0 kernel/locking/lockdep.c:5893
Code: 0f c1 05 f8 4d 3f 12 83 f8 01 0f 85 1d 01 00 00 9c 58 f6 c4 02 0f 85 08 01 00 00 41 f7 c5 00 02 00 00 74 01 fb 48 8b 44 24 10 <65> 48 2b 05 0d 0c 3f 12 0f 85 58 01 00 00 48 83 c4 18 5b 41 5c 41
RSP: 0018:ffffc9000458eef0 EFLAGS: 00000206
RAX: 6a3b0bf03f2b6b00 RBX: ffffffff8e5c15a0 RCX: ffffc9000458eefc
RDX: 0000000000000000 RSI: ffffffff8de2d7a0 RDI: ffffffff8c163380
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000006b1a R12: ffffffff816af8a4
R13: 0000000000000202 R14: ffff888079510000 R15: 0000000000000001
rcu_lock_release include/linux/rcupdate.h:341 [inline]
rcu_read_unlock include/linux/rcupdate.h:871 [inline]
class_rcu_destructor include/linux/rcupdate.h:1155 [inline]
unwind_next_frame+0x3f9/0x20a0 arch/x86/kernel/unwind_orc.c:479
__unwind_start+0x45f/0x7f0 arch/x86/kernel/unwind_orc.c:758
unwind_start arch/x86/include/asm/unwind.h:64 [inline]
arch_stack_walk+0x73/0x100 arch/x86/kernel/stacktrace.c:24
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
save_stack+0x160/0x1f0 mm/page_owner.c:156
__reset_page_owner+0x84/0x1a0 mm/page_owner.c:308
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1395 [inline]
free_unref_folios+0xa61/0x16b0 mm/page_alloc.c:2952
folios_put_refs+0x56f/0x740 mm/swap.c:999
folio_batch_release include/linux/pagevec.h:101 [inline]
shmem_undo_range+0x58f/0x1150 mm/shmem.c:1157
shmem_truncate_range mm/shmem.c:1269 [inline]
shmem_evict_inode+0x3a1/0xbe0 mm/shmem.c:1397
evict+0x3e3/0x920 fs/inode.c:810
iput_final fs/inode.c:1897 [inline]
iput fs/inode.c:1923 [inline]
iput+0x521/0x880 fs/inode.c:1909
dentry_unlink_inode+0x29c/0x480 fs/dcache.c:466
__dentry_kill+0x1d0/0x600 fs/dcache.c:669
dput.part.0+0x4b1/0x9b0 fs/dcache.c:911
dput+0x1f/0x30 fs/dcache.c:901
__fput+0x51c/0xb70 fs/file_table.c:476
task_work_run+0x150/0x240 kernel/task_work.c:227
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0x86f/0x2bf0 kernel/exit.c:961
do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
get_signal+0x2673/0x26d0 kernel/signal.c:3034
arch_do_signal_or_restart+0x8f/0x7d0 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop+0x84/0x110 kernel/entry/common.c:40
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x41c/0x4e0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6ae558ec29
Code: Unable to access opcode bytes at 0x7f6ae558ebff.
RSP: 002b:00007f6ae6354038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: 0000000000010106 RBX: 00007f6ae57d6090 RCX: 00007f6ae558ec29
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007f6ae5611e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6ae57d6128 R14: 00007f6ae57d6090 R15: 00007ffc44639248
</TASK>
Allocated by task 7892:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:388 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:405
kmalloc_noprof include/linux/slab.h:905 [inline]
rose_add_node net/rose/rose_route.c:85 [inline]
rose_rt_ioctl+0x880/0x2580 net/rose/rose_route.c:748
rose_ioctl+0x64d/0x7d0 net/rose/af_rose.c:1381
sock_do_ioctl+0x118/0x280 net/socket.c:1238
sock_ioctl+0x227/0x6b0 net/socket.c:1359
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:598 [inline]
__se_sys_ioctl fs/ioctl.c:584 [inline]
__x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:584
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 10720:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:243 [inline]
__kasan_slab_free+0x60/0x70 mm/kasan/common.c:275
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2422 [inline]
slab_free mm/slub.c:4695 [inline]
kfree+0x2b4/0x4d0 mm/slub.c:4894
rose_neigh_put include/net/rose.h:166 [inline]
rose_timer_expiry+0x53f/0x630 net/rose/rose_timer.c:183
call_timer_fn+0x197/0x620 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers+0x6ef/0x960 kernel/time/timer.c:2372
__run_timer_base kernel/time/timer.c:2384 [inline]
__run_timer_base kernel/time/timer.c:2376 [inline]
run_timer_base+0x114/0x190 kernel/time/timer.c:2393
run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2403
handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
The buggy address belongs to the object at ffff8880569e3400
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 53 bytes inside of
freed 512-byte region [ffff8880569e3400, ffff8880569e3600)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x569e0
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b841c80 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b841c80 0000000000000000 dead000000000001
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea00015a7801 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5844, tgid 5844 (syz-executor), ts 66287574491, free_ts 15197057508
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1851
prep_new_page mm/page_alloc.c:1859 [inline]
get_page_from_freelist+0x132b/0x38e0 mm/page_alloc.c:3858
__alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:5148
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:2492 [inline]
allocate_slab mm/slub.c:2660 [inline]
new_slab+0x247/0x330 mm/slub.c:2714
___slab_alloc+0xcf2/0x1750 mm/slub.c:3901
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3992
__slab_alloc_node mm/slub.c:4067 [inline]
slab_alloc_node mm/slub.c:4228 [inline]
__kmalloc_cache_noprof+0xfb/0x3e0 mm/slub.c:4402
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
mca_alloc net/ipv6/mcast.c:876 [inline]
__ipv6_dev_mc_inc+0x2f1/0xbc0 net/ipv6/mcast.c:966
br_ip6_multicast_join_snoopers net/bridge/br_multicast.c:4183 [inline]
br_multicast_join_snoopers+0xcb/0x120 net/bridge/br_multicast.c:4194
br_dev_open+0x112/0x150 net/bridge/br_device.c:174
__dev_open+0x2e7/0x7c0 net/core/dev.c:1682
__dev_change_flags+0x55d/0x720 net/core/dev.c:9549
netif_change_flags+0x8d/0x160 net/core/dev.c:9612
do_setlink.constprop.0+0xb53/0x4380 net/core/rtnetlink.c:3143
rtnl_changelink net/core/rtnetlink.c:3761 [inline]
__rtnl_newlink net/core/rtnetlink.c:3920 [inline]
rtnl_newlink+0x1446/0x2000 net/core/rtnetlink.c:4057
page last free pid 1 tgid 1 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1395 [inline]
__free_frozen_pages+0x7d5/0x10f0 mm/page_alloc.c:2895
__free_pages mm/page_alloc.c:5260 [inline]
free_contig_range+0x183/0x4b0 mm/page_alloc.c:7091
destroy_args+0x794/0xc10 mm/debug_vm_pgtable.c:958
debug_vm_pgtable+0x1a32/0x3640 mm/debug_vm_pgtable.c:1345
do_one_initcall+0x120/0x6e0 init/main.c:1269
do_initcall_level init/main.c:1331 [inline]
do_initcalls init/main.c:1347 [inline]
do_basic_setup init/main.c:1366 [inline]
kernel_init_freeable+0x5c2/0x910 init/main.c:1579
kernel_init+0x1c/0x2b0 init/main.c:1469
ret_from_fork+0x56a/0x730 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Memory state around the buggy address:
ffff8880569e3300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880569e3380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880569e3400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880569e3480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880569e3500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 0f c1 05 f8 4d 3f 12 xadd %eax,0x123f4df8(%rip) # 0x123f4dff
7: 83 f8 01 cmp $0x1,%eax
a: 0f 85 1d 01 00 00 jne 0x12d
10: 9c pushf
11: 58 pop %rax
12: f6 c4 02 test $0x2,%ah
15: 0f 85 08 01 00 00 jne 0x123
1b: 41 f7 c5 00 02 00 00 test $0x200,%r13d
22: 74 01 je 0x25
24: fb sti
25: 48 8b 44 24 10 mov 0x10(%rsp),%rax
* 2a: 65 48 2b 05 0d 0c 3f sub %gs:0x123f0c0d(%rip),%rax # 0x123f0c3f <-- trapping instruction
31: 12
32: 0f 85 58 01 00 00 jne 0x190
38: 48 83 c4 18 add $0x18,%rsp
3c: 5b pop %rbx
3d: 41 5c pop %r12
3f: 41 rex.B
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
Marco Elver
Sep 25, 2025, 2:49:03 PM (12 hours ago) Sep 25
to syzbot, syzkaller-upst...@googlegroups.com
#syz upstream
On Wed, 24 Sept 2025 at 05:46, syzbot
> --
> You received this message because you are subscribed to the Google Groups "syzkaller-upstream-moderation" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-upstream-m...@googlegroups.com.
> To view this discussion visit https://groups.google.com/d/msgid/syzkaller-upstream-moderation/68d36998.050a0220.139b6.0029.GAE%40google.com.
On Wed, 24 Sept 2025 at 05:46, syzbot
> You received this message because you are subscribed to the Google Groups "syzkaller-upstream-moderation" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-upstream-m...@googlegroups.com.
> To view this discussion visit https://groups.google.com/d/msgid/syzkaller-upstream-moderation/68d36998.050a0220.139b6.0029.GAE%40google.com.
Reply all
Reply to author
Forward
0 new messages