==================================================================
BUG: KASAN: use-after-free in rose_timer_expiry+0x470/0x490 net/rose/rose_timer.c:183
Read of size 2 at addr ffff88806018142a by task syz.4.822/8606
CPU: 0 PID: 8606 Comm: syz.4.822 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
print_address_description+0x60/0x2d0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:434 [inline]
kasan_report+0xdf/0x130 mm/kasan/report.c:451
rose_timer_expiry+0x470/0x490 net/rose/rose_timer.c:183
call_timer_fn+0x16c/0x530 kernel/time/timer.c:1451
expire_timers kernel/time/timer.c:1496 [inline]
__run_timers+0x525/0x7c0 kernel/time/timer.c:1767
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780
handle_softirqs+0x328/0x820 kernel/softirq.c:576
__do_softirq kernel/softirq.c:610 [inline]
invoke_softirq kernel/softirq.c:450 [inline]
__irq_exit_rcu+0x12f/0x220 kernel/softirq.c:659
irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa5/0x100 kernel/locking/spinlock.c:194
Code: 74 05 e8 be 9a d2 f7 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 d6 22 a6 f7 65 8b 05 67 20 57 76 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0000:ffffc9000326f5c0 EFLAGS: 00000206
RAX: e7b73ea474da3d00 RBX: 0000000000000a06 RCX: e7b73ea474da3d00
RDX: dffffc0000000000 RSI: ffffffff8a0b1be0 RDI: 0000000000000001
RBP: ffffc9000326f650 R08: dffffc0000000000 R09: fffffbfff1ff542f
R10: fffffbfff1ff542f R11: 1ffffffff1ff542e R12: dffffc0000000000
R13: 0000000000000000 R14: ffff8880503ff6c0 R15: 1ffff9200064deb8
spin_unlock_irqrestore include/linux/spinlock.h:419 [inline]
__wake_up_common_lock kernel/sched/wait.c:140 [inline]
__wake_up_sync_key+0x11b/0x180 kernel/sched/wait.c:205
__unix_dgram_recvmsg+0x497/0xd50 net/unix/af_unix.c:2342
____sys_recvmsg+0x291/0x580 net/socket.c:-1
___sys_recvmsg+0x1af/0x4f0 net/socket.c:2707
do_recvmmsg+0x344/0x7a0 net/socket.c:2801
__sys_recvmmsg net/socket.c:2880 [inline]
__do_sys_recvmmsg net/socket.c:2903 [inline]
__se_sys_recvmmsg net/socket.c:2896 [inline]
__x64_sys_recvmmsg+0x18d/0x240 net/socket.c:2896
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f5fd4b14749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5fd2d5a038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f5fd4d6b090 RCX: 00007f5fd4b14749
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000005
RBP: 00007f5fd4b98f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5fd4d6b128 R14: 00007f5fd4d6b090 R15: 00007ffd1369aa88
Allocated by task 8537:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
____kasan_kmalloc mm/kasan/common.c:513 [inline]
__kasan_kmalloc+0xb5/0xf0 mm/kasan/common.c:522
kmalloc include/linux/slab.h:607 [inline]
kzalloc include/linux/slab.h:738 [inline]
io_get_sq_data io_uring/io_uring.c:8310 [inline]
io_sq_offload_create io_uring/io_uring.c:8736 [inline]
io_uring_create io_uring/io_uring.c:10416 [inline]
io_uring_setup io_uring/io_uring.c:10502 [inline]
__do_sys_io_uring_setup io_uring/io_uring.c:10508 [inline]
__se_sys_io_uring_setup+0x132f/0x2850 io_uring/io_uring.c:10505
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
Freed by task 8537:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:46
kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1710 [inline]
slab_free_freelist_hook+0xea/0x170 mm/slub.c:1736
slab_free mm/slub.c:3504 [inline]
kfree+0xef/0x2a0 mm/slub.c:4564
io_sq_thread_finish+0x28a/0x2e0 io_uring/io_uring.c:8258
io_sq_offload_create io_uring/io_uring.c:8805 [inline]
io_uring_create io_uring/io_uring.c:10416 [inline]
io_uring_setup io_uring/io_uring.c:10502 [inline]
__do_sys_io_uring_setup io_uring/io_uring.c:10508 [inline]
__se_sys_io_uring_setup+0x1ea7/0x2850 io_uring/io_uring.c:10505
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
Last potentially related work creation:
kasan_save_stack+0x35/0x60 mm/kasan/common.c:38
kasan_record_aux_stack+0xb8/0x100 mm/kasan/generic.c:348
__call_rcu kernel/rcu/tree.c:3011 [inline]
call_rcu+0x182/0x930 kernel/rcu/tree.c:3091
fib6_info_release include/net/ip6_fib.h:339 [inline]
fixup_permanent_addr net/ipv6/addrconf.c:3520 [inline]
addrconf_permanent_addr+0x34d/0x980 net/ipv6/addrconf.c:3548
addrconf_notify+0x827/0xf00 net/ipv6/addrconf.c:3616
notifier_call_chain kernel/notifier.c:83 [inline]
raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:391
call_netdevice_notifiers_extack net/core/dev.c:2061 [inline]
call_netdevice_notifiers net/core/dev.c:2075 [inline]
__dev_notify_flags+0x178/0x2d0 net/core/dev.c:-1
dev_change_flags+0xe3/0x1a0 net/core/dev.c:8929
do_setlink+0xc01/0x3980 net/core/rtnetlink.c:2781
__rtnl_newlink net/core/rtnetlink.c:3452 [inline]
rtnl_newlink+0x1419/0x17d0 net/core/rtnetlink.c:3574
rtnetlink_rcv_msg+0x7ff/0xe90 net/core/rtnetlink.c:5684
netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2507
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x774/0x920 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x8ab/0xbc0 net/netlink/af_netlink.c:1918
sock_sendmsg_nosec net/socket.c:706 [inline]
__sock_sendmsg net/socket.c:718 [inline]
__sys_sendto+0x423/0x580 net/socket.c:2073
__do_sys_sendto net/socket.c:2085 [inline]
__se_sys_sendto net/socket.c:2081 [inline]
__x64_sys_sendto+0xda/0xf0 net/socket.c:2081
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
The buggy address belongs to the object at ffff888060181400
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
512-byte region [ffff888060181400, ffff888060181600)
The buggy address belongs to the page:
page:ffffea0001806000 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888060183c00 pfn:0x60180
head:ffffea0001806000 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea00007c0908 ffffea0001849c08 ffff888016841c80
raw: ffff888060183c00 000000000010000f 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4185, ts 72917212540, free_ts 22409765674
prep_new_page mm/page_alloc.c:2426 [inline]
get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192
__alloc_pages+0x1e1/0x470 mm/page_alloc.c:5487
alloc_slab_page mm/slub.c:1780 [inline]
allocate_slab mm/slub.c:1917 [inline]
new_slab+0xc0/0x4b0 mm/slub.c:1980
___slab_alloc+0x81e/0xdf0 mm/slub.c:3013
__slab_alloc mm/slub.c:3100 [inline]
slab_alloc_node mm/slub.c:3191 [inline]
__kmalloc_node_track_caller+0x1fc/0x3a0 mm/slub.c:4963
kmalloc_reserve net/core/skbuff.c:356 [inline]
pskb_expand_head+0x127/0x10f0 net/core/skbuff.c:1709
netlink_trim+0x180/0x220 net/netlink/af_netlink.c:1299
netlink_broadcast_filtered+0x7c/0x1170 net/netlink/af_netlink.c:1511
netlink_broadcast net/netlink/af_netlink.c:1556 [inline]
nlmsg_multicast include/net/netlink.h:1033 [inline]
nlmsg_notify+0xec/0x1a0 net/netlink/af_netlink.c:2550
fib_table_insert+0x987/0x1b20 net/ipv4/fib_trie.c:1379
fib_magic+0x2c1/0x390 net/ipv4/fib_frontend.c:1106
fib_add_ifaddr+0x140/0x5e0 net/ipv4/fib_frontend.c:1128
fib_inetaddr_event+0x13c/0x1c0 net/ipv4/fib_frontend.c:1442
notifier_call_chain kernel/notifier.c:83 [inline]
blocking_notifier_call_chain+0x103/0x1b0 kernel/notifier.c:318
__inet_insert_ifa+0x9e9/0xbc0 net/ipv4/devinet.c:567
inet_rtm_newaddr+0x940/0x1800 net/ipv4/devinet.c:966
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1340 [inline]
free_pcp_prepare mm/page_alloc.c:1391 [inline]
free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317
free_unref_page+0x94/0x280 mm/page_alloc.c:3396
free_contig_range+0x96/0xf0 mm/page_alloc.c:9406
destroy_args+0x100/0xa20 mm/debug_vm_pgtable.c:1018
debug_vm_pgtable+0x318/0x370 mm/debug_vm_pgtable.c:1336
do_one_initcall+0x1ee/0x680 init/main.c:1316
do_initcall_level+0x137/0x1f0 init/main.c:1389
do_initcalls+0x4b/0x90 init/main.c:1405
kernel_init_freeable+0x3ce/0x560 init/main.c:1629
kernel_init+0x19/0x1b0 init/main.c:1520
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Memory state around the buggy address:
ffff888060181300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888060181380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888060181400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888060181480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888060181500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 74 05 je 0x7
2: e8 be 9a d2 f7 call 0xf7d29ac5
7: 48 c7 44 24 20 00 00 movq $0x0,0x20(%rsp)
e: 00 00
10: 9c pushf
11: 8f 44 24 20 pop 0x20(%rsp)
15: f6 44 24 21 02 testb $0x2,0x21(%rsp)
1a: 75 4b jne 0x67
1c: f7 c3 00 02 00 00 test $0x200,%ebx
22: 74 01 je 0x25
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 d6 22 a6 f7 call 0xf7a62305 <-- trapping instruction
2f: 65 8b 05 67 20 57 76 mov %gs:0x76572067(%rip),%eax # 0x7657209d
36: 85 c0 test %eax,%eax
38: 74 3c je 0x76
3a: 48 rex.W
3b: c7 .byte 0xc7
3c: 04 24 add $0x24,%al
3e: 0e (bad)
3f: 36 ss