==================================================================
BUG: KASAN: use-after-free in rose_timer_expiry+0x470/0x490 net/rose/rose_timer.c:183
Read of size 2 at addr ffff88806036c42a by task syz.3.824/7500
CPU: 0 PID: 7500 Comm: syz.3.824 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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:preempt_count_add+0x2/0x190 kernel/sched/core.c:5499
Code: e1 07 80 c1 03 38 c1 7c 97 48 8b 3c 24 e8 96 c3 6a 00 eb 8c e9 f5 fe ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 41 57 <41> 56 53 49 bf 00 00 00 00 00 fc ff df 48 c7 c0 80 4f 0c 96 48 c1
RSP: 0000:ffffc900049aeb08 EFLAGS: 00000293
RAX: ffffffff83f6dab6 RBX: ffffffff96116ec0 RCX: ffff88807d855940
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: 0000000000000001 R08: ffff88807d855940 R09: 0000000000000003
R10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000033691 R14: ffff88807f466900 R15: dffffc0000000000
percpu_counter_add_batch+0x30/0x160 lib/percpu_counter.c:86
vm_acct_memory include/linux/mman.h:76 [inline]
__vm_enough_memory+0x4e/0x2d0 mm/util.c:979
shmem_acct_block mm/shmem.c:202 [inline]
shmem_inode_acct_block mm/shmem.c:217 [inline]
shmem_alloc_and_acct_page+0x186/0xb70 mm/shmem.c:1605
shmem_getpage_gfp+0x14f4/0x2d40 mm/shmem.c:1906
shmem_getpage mm/shmem.c:151 [inline]
shmem_write_begin+0xcd/0x1a0 mm/shmem.c:2474
generic_perform_write+0x2aa/0x530 mm/filemap.c:3785
__generic_file_write_iter+0x25f/0x4e0 mm/filemap.c:3912
generic_file_write_iter+0xa6/0x1b0 mm/filemap.c:3944
__kernel_write+0x4f9/0x930 fs/read_write.c:539
__dump_emit+0x243/0x360 fs/coredump.c:943
dump_user_range+0x84/0x340 fs/coredump.c:1017
elf_core_dump+0x2ff7/0x3530 fs/binfmt_elf.c:2285
do_coredump+0x1419/0x2960 fs/coredump.c:894
get_signal+0x40a/0x12c0 kernel/signal.c:2886
arch_do_signal_or_restart+0xc1/0x1300 arch/x86/kernel/signal.c:867
handle_signal_work kernel/entry/common.c:154 [inline]
exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:320
exc_page_fault+0x88/0x100 arch/x86/mm/fault.c:1504
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x7f5b911286d1
Code: 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 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:fffffffffffffe70 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f5b9137f090 RCX: 00007f5b911286c9
RDX: 0000000000000000 RSI: fffffffffffffe70 RDI: 0000000000008000
RBP: 00007f5b911aaf91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f5b9137f128 R14: 00007f5b9137f090 R15: 00007ffd49716e28
Allocated by task 6676:
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_reserve net/core/skbuff.c:356 [inline]
__alloc_skb+0x22c/0x750 net/core/skbuff.c:427
alloc_skb include/linux/skbuff.h:1162 [inline]
alloc_skb_with_frags+0xa7/0x730 net/core/skbuff.c:6170
sock_alloc_send_pskb+0x853/0x980 net/core/sock.c:2536
__ip6_append_data+0x257b/0x3810 net/ipv6/ip6_output.c:1663
ip6_make_skb+0x3af/0x4c0 net/ipv6/ip6_output.c:2031
udpv6_sendmsg+0x1b67/0x2320 net/ipv6/udp.c:1580
sock_sendmsg_nosec net/socket.c:706 [inline]
__sock_sendmsg net/socket.c:718 [inline]
____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2446
___sys_sendmsg+0x1f0/0x260 net/socket.c:2500
__sys_sendmmsg+0x27c/0x4a0 net/socket.c:2586
__do_sys_sendmmsg net/socket.c:2615 [inline]
__se_sys_sendmmsg net/socket.c:2612 [inline]
__x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2612
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 ffff88806036c400
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
512-byte region [ffff88806036c400, ffff88806036c600)
The buggy address belongs to the page:
page:ffffea000180db00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88806036c400 pfn:0x6036c
head:ffffea000180db00 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0001866808 ffffea00017b9a08 ffff888016841c80
raw: ffff88806036c400 0000000000100009 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4182, ts 58254377761, free_ts 18354170278
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]
__alloc_skb+0x22c/0x750 net/core/skbuff.c:427
alloc_skb include/linux/skbuff.h:1162 [inline]
alloc_uevent_skb+0x7d/0x230 lib/kobject_uevent.c:290
uevent_net_broadcast_tagged lib/kobject_uevent.c:351 [inline]
kobject_uevent_net_broadcast+0x17e/0x530 lib/kobject_uevent.c:412
kobject_uevent_env+0x556/0x890 lib/kobject_uevent.c:608
__kobject_del+0xd2/0x2f0 lib/kobject.c:625
kobject_cleanup lib/kobject.c:704 [inline]
kobject_release lib/kobject.c:744 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x235/0x460 lib/kobject.c:761
netdev_queue_update_kobjects+0x382/0x3e0 net/core/net-sysfs.c:1726
netif_set_real_num_tx_queues+0x15c/0x840 net/core/dev.c:2971
veth_init_queues+0x83/0x180 drivers/net/veth.c:1608
veth_newlink+0xab7/0xda0 drivers/net/veth.c:1732
__rtnl_newlink net/core/rtnetlink.c:3526 [inline]
rtnl_newlink+0x114c/0x17d0 net/core/rtnetlink.c:3574
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:
ffff88806036c300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88806036c380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88806036c400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88806036c480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88806036c500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: e1 07 loope 0x9
2: 80 c1 03 add $0x3,%cl
5: 38 c1 cmp %al,%cl
7: 7c 97 jl 0xffffffa0
9: 48 8b 3c 24 mov (%rsp),%rdi
d: e8 96 c3 6a 00 call 0x6ac3a8
12: eb 8c jmp 0xffffffa0
14: e9 f5 fe ff ff jmp 0xffffff0e
19: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1)
20: 00 00 00
23: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
28: 41 57 push %r15
* 2a: 41 56 push %r14 <-- trapping instruction
2c: 53 push %rbx
2d: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15
34: fc ff df
37: 48 c7 c0 80 4f 0c 96 mov $0xffffffff960c4f80,%rax
3e: 48 rex.W
3f: c1 .byte 0xc1