==================================================================
BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x46a/0x4b0 net/rose/rose_timer.c:183
Read of size 2 at addr ffff88805e65242a by task syz.0.1463/16143
CPU: 0 PID: 16143 Comm: syz.0.1463 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xac/0x220 mm/kasan/report.c:468
kasan_report+0x117/0x150 mm/kasan/report.c:581
rose_timer_expiry+0x46a/0x4b0 net/rose/rose_timer.c:183
call_timer_fn+0x16e/0x530 kernel/time/timer.c:1700
expire_timers kernel/time/timer.c:1751 [inline]
__run_timers+0x52d/0x7d0 kernel/time/timer.c:2022
run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2035
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:console_flush_all+0x889/0xd00 arch/x86/include/asm/irqflags.h:-1
Code: ed 01 00 00 e8 48 2a 1b 00 4d 85 ff 48 8b 5c 24 38 75 07 e8 39 2a 1b 00 eb 06 e8 32 2a 1b 00 fb 49 bf 00 00 00 00 00 fc ff df <48> 8b 44 24 50 42 0f b6 04 38 84 c0 0f 85 2f 02 00 00 80 3b 01 0f
RSP: 0018:ffffc9000b58f4a0 EFLAGS: 00000283
RAX: ffffffff816a656e RBX: ffffc9000b58f63f RCX: 0000000000080000
RDX: ffffc900154d5000 RSI: 00000000000051eb RDI: 00000000000051ec
RBP: ffffc9000b58f610 R08: ffffffff90da5507 R09: 1ffffffff21b4aa0
R10: dffffc0000000000 R11: fffffbfff21b4aa1 R12: ffffffff8d4b5960
R13: 1ffffffff19792b0 R14: ffffffff8d4b59b8 R15: dffffc0000000000
console_unlock+0xae/0x340 kernel/printk/printk.c:3069
vprintk_emit+0x477/0x600 kernel/printk/printk.c:2341
_printk+0xd0/0x110 kernel/printk/printk.c:2366
f2fs_printk+0x3d5/0x470 fs/f2fs/super.c:-1
sanity_check_raw_super fs/f2fs/super.c:-1 [inline]
read_raw_super_block fs/f2fs/super.c:3959 [inline]
f2fs_fill_super+0xa14/0x6c20 fs/f2fs/super.c:4408
mount_bdev+0x22b/0x2d0 fs/super.c:1643
legacy_get_tree+0xea/0x180 fs/fs_context.c:662
vfs_get_tree+0x8c/0x280 fs/super.c:1764
do_new_mount+0x24b/0xa40 fs/namespace.c:3377
do_mount fs/namespace.c:3717 [inline]
__do_sys_mount fs/namespace.c:3926 [inline]
__se_sys_mount+0x2da/0x3c0 fs/namespace.c:3903
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f1ce1b9038a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f1ce2a3be68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f1ce2a3bef0 RCX: 00007f1ce1b9038a
RDX: 0000200000000140 RSI: 00002000000008c0 RDI: 00007f1ce2a3beb0
RBP: 0000200000000140 R08: 00007f1ce2a3bef0 R09: 0000000002000414
R10: 0000000002000414 R11: 0000000000000246 R12: 00002000000008c0
R13: 00007f1ce2a3beb0 R14: 000000000000556d R15: 00002000000001c0
Allocated by task 14669:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:374 [inline]
__kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:383
kmalloc include/linux/slab.h:600 [inline]
rose_add_node+0x23a/0xdd0 net/rose/rose_route.c:85
rose_rt_ioctl+0xa42/0xfb0 net/rose/rose_route.c:740
rose_ioctl+0x3cf/0x8b0 net/rose/af_rose.c:1380
sock_do_ioctl+0xd7/0x2f0 net/socket.c:1222
sock_ioctl+0x623/0x7a0 net/socket.c:1341
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:45
__kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492
insert_work+0x3d/0x310 kernel/workqueue.c:1651
__queue_work+0xd2c/0x1020 kernel/workqueue.c:1804
call_timer_fn+0x16e/0x530 kernel/time/timer.c:1700
expire_timers kernel/time/timer.c:1746 [inline]
__run_timers+0x558/0x7d0 kernel/time/timer.c:2022
run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2035
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
Second to last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:45
__kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492
insert_work+0x3d/0x310 kernel/workqueue.c:1651
__queue_work+0xd2c/0x1020 kernel/workqueue.c:1804
call_timer_fn+0x16e/0x530 kernel/time/timer.c:1700
expire_timers kernel/time/timer.c:1746 [inline]
__run_timers+0x558/0x7d0 kernel/time/timer.c:2022
run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2035
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
The buggy address belongs to the object at ffff88805e652400
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
freed 512-byte region [ffff88805e652400, ffff88805e652600)
The buggy address belongs to the physical page:
page:ffffea0001799400 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88805e650800 pfn:0x5e650
head:ffffea0001799400 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888017841c80 ffffea0001760d10 ffffea0001ab5710
raw: ffff88805e650800 0000000000100003 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 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 58, tgid 58 (kworker/u4:4), ts 77316794858, free_ts 77313079092
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554
prep_new_page mm/page_alloc.c:1561 [inline]
get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191
__alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457
alloc_slab_page+0x5d/0x170 mm/slub.c:1876
allocate_slab mm/slub.c:2023 [inline]
new_slab+0x87/0x2e0 mm/slub.c:2076
___slab_alloc+0xc6d/0x12f0 mm/slub.c:3230
__slab_alloc mm/slub.c:3329 [inline]
__slab_alloc_node mm/slub.c:3382 [inline]
slab_alloc_node mm/slub.c:3475 [inline]
__kmem_cache_alloc_node+0x1a2/0x260 mm/slub.c:3524
__do_kmalloc_node mm/slab_common.c:1006 [inline]
__kmalloc+0xa4/0x240 mm/slab_common.c:1020
kmalloc include/linux/slab.h:604 [inline]
kzalloc include/linux/slab.h:721 [inline]
fib6_info_alloc+0x32/0xe0 net/ipv6/ip6_fib.c:155
ip6_route_info_create+0x44f/0x1200 net/ipv6/route.c:3793
ip6_route_add+0x28/0x130 net/ipv6/route.c:3889
addrconf_prefix_route net/ipv6/addrconf.c:2450 [inline]
addrconf_add_linklocal+0x45c/0x6b0 net/ipv6/addrconf.c:3286
addrconf_addr_gen+0x4ac/0x5a0 net/ipv6/addrconf.c:3415
addrconf_init_auto_addrs+0x70e/0xaa0 net/ipv6/addrconf.c:-1
addrconf_notify+0xb62/0x1010 net/ipv6/addrconf.c:3712
notifier_call_chain+0x197/0x390 kernel/notifier.c:93
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1154 [inline]
free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2429
__stack_depot_save+0x572/0x630 lib/stackdepot.c:443
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x5f/0x70 mm/kasan/common.c:52
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:328
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767
slab_alloc_node mm/slub.c:3485 [inline]
kmem_cache_alloc_node+0x150/0x330 mm/slub.c:3530
__alloc_skb+0x108/0x2c0 net/core/skbuff.c:640
alloc_skb include/linux/skbuff.h:1284 [inline]
nlmsg_new include/net/netlink.h:999 [inline]
inet6_rt_notify+0xb4/0x240 net/ipv6/route.c:6236
fib6_add_rt2node net/ipv6/ip6_fib.c:1260 [inline]
fib6_add+0x1d9a/0x3d20 net/ipv6/ip6_fib.c:1489
__ip6_ins_rt net/ipv6/route.c:1343 [inline]
ip6_route_add+0x8a/0x130 net/ipv6/route.c:3893
addrconf_add_mroute net/ipv6/addrconf.c:2514 [inline]
addrconf_add_dev+0x257/0x340 net/ipv6/addrconf.c:2532
addrconf_dev_config net/ipv6/addrconf.c:3451 [inline]
addrconf_init_auto_addrs+0x5cc/0xaa0 net/ipv6/addrconf.c:3539
addrconf_notify+0xb62/0x1010 net/ipv6/addrconf.c:3712
notifier_call_chain+0x197/0x390 kernel/notifier.c:93
netdev_state_change+0xd6/0x150 net/core/dev.c:1408
Memory state around the buggy address:
ffff88805e652300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88805e652380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88805e652400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88805e652480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88805e652500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: ed in (%dx),%eax
1: 01 00 add %eax,(%rax)
3: 00 e8 add %ch,%al
5: 48 2a 1b rex.W sub (%rbx),%bl
8: 00 4d 85 add %cl,-0x7b(%rbp)
b: ff 48 8b decl -0x75(%rax)
e: 5c pop %rsp
f: 24 38 and $0x38,%al
11: 75 07 jne 0x1a
13: e8 39 2a 1b 00 call 0x1b2a51
18: eb 06 jmp 0x20
1a: e8 32 2a 1b 00 call 0x1b2a51
1f: fb sti
20: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15
27: fc ff df
* 2a: 48 8b 44 24 50 mov 0x50(%rsp),%rax <-- trapping instruction
2f: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax
34: 84 c0 test %al,%al
36: 0f 85 2f 02 00 00 jne 0x26b
3c: 80 3b 01 cmpb $0x1,(%rbx)
3f: 0f .byte 0xf