==================================================================
BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x471/0x4b0 net/rose/rose_timer.c:183
Read of size 2 at addr ffff88803067d02a by task syz-executor/12293
CPU: 1 UID: 0 PID: 12293 Comm: syz-executor Not tainted 6.15.0-rc4-syzkaller-00163-ge8716b5b0dff #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xb4/0x290 mm/kasan/report.c:521
kasan_report+0x118/0x150 mm/kasan/report.c:634
rose_timer_expiry+0x471/0x4b0 net/rose/rose_timer.c:183
call_timer_fn+0x17b/0x5f0 kernel/time/timer.c:1789
expire_timers kernel/time/timer.c:1840 [inline]
__run_timers kernel/time/timer.c:2414 [inline]
__run_timer_base+0x61a/0x860 kernel/time/timer.c:2426
run_timer_base kernel/time/timer.c:2435 [inline]
run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2445
handle_softirqs+0x283/0x870 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:mem_cgroup_from_task+0xbb/0x120 mm/memcontrol.c:900
Code: 06 04 75 09 e8 76 99 7c ff 85 c0 74 28 48 83 c3 20 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 98 94 f8 ff 48 8b 03 <5b> 41 5e 41 5f c3 cc cc cc cc cc e8 85 cd 2c 09 85 c0 74 cf 80 3d
RSP: 0000:ffffc90003e7fce0 EFLAGS: 00000246
RAX: ffff888058ae2000 RBX: ffff88814dcd7020 RCX: 0f70986a9aa03500
RDX: 0000000000000000 RSI: ffffffff8d93503a RDI: ffffffff8bc1cde0
RBP: ffffc90003e7fdd0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8209b602 R12: 0000000000000001
R13: dffffc0000000000 R14: ffff88802b709e2c R15: dffffc0000000000
count_memcg_events_mm include/linux/memcontrol.h:987 [inline]
count_memcg_event_mm+0x199/0x3b0 include/linux/memcontrol.h:996
mm_account_fault mm/memory.c:6174 [inline]
handle_mm_fault+0x4ee/0x8c0 mm/memory.c:6335
do_user_addr_fault+0xa81/0x1390 arch/x86/mm/fault.c:1337
handle_page_fault arch/x86/mm/fault.c:1480 [inline]
exc_page_fault+0x68/0x110 arch/x86/mm/fault.c:1538
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f3e22b84e1a
Code: 1f 00 00 48 89 05 86 79 d6 00 74 05 e8 ff b1 e7 ff 48 83 3d f7 7e 1f 00 00 74 05 e8 f0 b1 e7 ff 48 83 3d 48 80 1f 00 00 74 05 51 87 fc ff e8 4c f7 fb ff 49 89 c4 eb 12 0f 1f 80 00 00 00 00
RSP: 002b:00007ffef771a9d0 EFLAGS: 00010202
RAX: 0000000000000008 RBX: 0000000000000000 RCX: 00007f3e22b8520d
RDX: 0000000000000000 RSI: 0000000000000018 RDI: 0000555556ff77e0
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 0000555556ff77d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 000000000004c2c4 R15: 00007ffef771ab60
Allocated by task 11743:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394
kasan_kmalloc include/linux/kasan.h:260 [inline]
__do_kmalloc_node mm/slub.c:4341 [inline]
__kmalloc_noprof+0x27a/0x4f0 mm/slub.c:4353
kmalloc_noprof include/linux/slab.h:909 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
fib6_info_alloc+0x30/0xf0 net/ipv6/ip6_fib.c:155
ip6_route_info_create+0x4b3/0x1360 net/ipv6/route.c:3802
addrconf_f6i_alloc+0x1c6/0x3f0 net/ipv6/route.c:4631
fixup_permanent_addr net/ipv6/addrconf.c:3587 [inline]
addrconf_permanent_addr+0x274/0x9d0 net/ipv6/addrconf.c:3626
addrconf_notify+0x887/0x1010 net/ipv6/addrconf.c:3698
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
call_netdevice_notifiers net/core/dev.c:2228 [inline]
__dev_notify_flags+0x18d/0x2e0 net/core/dev.c:-1
netif_change_flags+0xe8/0x1a0 net/core/dev.c:9434
do_setlink+0xcb9/0x40d0 net/core/rtnetlink.c:3152
rtnl_changelink net/core/rtnetlink.c:3769 [inline]
__rtnl_newlink net/core/rtnetlink.c:3928 [inline]
rtnl_newlink+0x160b/0x1c70 net/core/rtnetlink.c:4065
rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6955
netlink_rcv_skb+0x219/0x490 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x758/0x8d0 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg+0x219/0x270 net/socket.c:727
__sys_sendto+0x3bd/0x520 net/socket.c:2180
__do_sys_sendto net/socket.c:2187 [inline]
__se_sys_sendto net/socket.c:2183 [inline]
__x64_sys_sendto+0xde/0x100 net/socket.c:2183
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 180:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x62/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2398 [inline]
slab_free mm/slub.c:4656 [inline]
kfree+0x193/0x440 mm/slub.c:4855
rcu_do_batch kernel/rcu/tree.c:2568 [inline]
rcu_core+0xca5/0x1710 kernel/rcu/tree.c:2824
handle_softirqs+0x283/0x870 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
Last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:47
kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:548
__call_rcu_common kernel/rcu/tree.c:3082 [inline]
call_rcu+0x142/0x990 kernel/rcu/tree.c:3202
call_rcu_hurry include/linux/rcupdate.h:115 [inline]
fib6_info_release include/net/ip6_fib.h:343 [inline]
__ip6_del_rt+0x111/0x180 net/ipv6/route.c:3923
ip6_del_rt+0xb3/0x100 net/ipv6/route.c:3934
__ipv6_ifa_notify+0x5c7/0xac0 net/ipv6/addrconf.c:6313
addrconf_ifdown+0xe69/0x1880 net/ipv6/addrconf.c:3981
addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
call_netdevice_notifiers net/core/dev.c:2228 [inline]
dev_close_many+0x29c/0x410 net/core/dev.c:1731
unregister_netdevice_many_notify+0x834/0x2330 net/core/dev.c:11952
unregister_netdevice_many net/core/dev.c:12046 [inline]
default_device_exit_batch+0x819/0x890 net/core/dev.c:12538
ops_exit_list net/core/net_namespace.c:177 [inline]
cleanup_net+0x7a9/0xbd0 net/core/net_namespace.c:654
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x70e/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
The buggy address belongs to the object at ffff88803067d000
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
freed 512-byte region [ffff88803067d000, ffff88803067d200)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3067c
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801a041c80 ffffea0001ecd200 dead000000000002
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801a041c80 ffffea0001ecd200 dead000000000002
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0000c19f01 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 5214, tgid 5214 (udevd), ts 38467482981, free_ts 37924955877
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1d8/0x230 mm/page_alloc.c:1718
prep_new_page mm/page_alloc.c:1726 [inline]
get_page_from_freelist+0x21ce/0x22b0 mm/page_alloc.c:3688
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4970
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2301
alloc_slab_page mm/slub.c:2468 [inline]
allocate_slab+0x8a/0x3b0 mm/slub.c:2632
new_slab mm/slub.c:2686 [inline]
___slab_alloc+0xbfc/0x1480 mm/slub.c:3872
__slab_alloc mm/slub.c:3962 [inline]
__slab_alloc_node mm/slub.c:4037 [inline]
slab_alloc_node mm/slub.c:4198 [inline]
__kmalloc_cache_noprof+0x296/0x3d0 mm/slub.c:4367
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
kernfs_fop_open+0x397/0xca0 fs/kernfs/file.c:623
do_dentry_open+0xdf0/0x1970 fs/open.c:956
vfs_open+0x3b/0x340 fs/open.c:1086
do_open fs/namei.c:3880 [inline]
path_openat+0x2ee5/0x3830 fs/namei.c:4039
do_filp_open+0x1fa/0x410 fs/namei.c:4066
do_sys_openat2+0x121/0x1c0 fs/open.c:1429
do_sys_open fs/open.c:1444 [inline]
__do_sys_openat fs/open.c:1460 [inline]
__se_sys_openat fs/open.c:1455 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1455
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5200 tgid 5200 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1262 [inline]
__free_frozen_pages+0xb0e/0xcd0 mm/page_alloc.c:2725
__slab_free+0x326/0x400 mm/slub.c:4567
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4161 [inline]
slab_alloc_node mm/slub.c:4210 [inline]
kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4217
getname_flags+0xb8/0x540 fs/namei.c:146
getname include/linux/fs.h:2852 [inline]
do_sys_openat2+0xbc/0x1c0 fs/open.c:1423
do_sys_open fs/open.c:1444 [inline]
__do_sys_openat fs/open.c:1460 [inline]
__se_sys_openat fs/open.c:1455 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1455
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88803067cf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88803067cf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88803067d000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88803067d080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88803067d100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 04 75 add $0x75,%al
2: 09 e8 or %ebp,%eax
4: 76 99 jbe 0xffffff9f
6: 7c ff jl 0x7
8: 85 c0 test %eax,%eax
a: 74 28 je 0x34
c: 48 83 c3 20 add $0x20,%rbx
10: 48 89 d8 mov %rbx,%rax
13: 48 c1 e8 03 shr $0x3,%rax
17: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1)
1c: 74 08 je 0x26
1e: 48 89 df mov %rbx,%rdi
21: e8 98 94 f8 ff call 0xfff894be
26: 48 8b 03 mov (%rbx),%rax
* 29: 5b pop %rbx <-- trapping instruction
2a: 41 5e pop %r14
2c: 41 5f pop %r15
2e: c3 ret
2f: cc int3
30: cc int3
31: cc int3
32: cc int3
33: cc int3
34: e8 85 cd 2c 09 call 0x92ccdbe
39: 85 c0 test %eax,%eax
3b: 74 cf je 0xc
3d: 80 .byte 0x80
3e: 3d .byte 0x3d