==================================================================
BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x464/0x4a0 net/rose/rose_timer.c:183
Read of size 2 at addr ffff88805b33082a by task syz-executor/14657
CPU: 1 UID: 0 PID: 14657 Comm: syz-executor Not tainted 6.14.0-rc5-syzkaller-01183-g40587f749df2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0x16e/0x5b0 mm/kasan/report.c:521
kasan_report+0x143/0x180 mm/kasan/report.c:634
rose_timer_expiry+0x464/0x4a0 net/rose/rose_timer.c:183
call_timer_fn+0x187/0x650 kernel/time/timer.c:1789
expire_timers kernel/time/timer.c:1840 [inline]
__run_timers kernel/time/timer.c:2414 [inline]
__run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2426
run_timer_base kernel/time/timer.c:2435 [inline]
run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2445
handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:561
__do_softirq kernel/softirq.c:595 [inline]
invoke_softirq kernel/softirq.c:435 [inline]
__irq_exit_rcu+0xf7/0x220 kernel/softirq.c:662
irq_exit_rcu+0x9/0x30 kernel/softirq.c:678
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:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5855
Code: 2b 00 74 08 4c 89 f7 e8 ba 4f 8c 00 f6 44 24 61 02 0f 85 85 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc900044bfbc0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff92000897f84 RCX: ffff88801fbec6e8
RDX: dffffc0000000000 RSI: ffffffff8c2ac500 RDI: ffffffff8c80fde0
RBP: ffffc900044bfd18 R08: ffffffff94552877 R09: 1ffffffff28aa50e
R10: dffffc0000000000 R11: fffffbfff28aa50f R12: 1ffff92000897f80
R13: dffffc0000000000 R14: ffffc900044bfc20 R15: 0000000000000246
__might_fault+0xc6/0x120 mm/memory.c:6851
_inline_copy_from_user include/linux/uaccess.h:162 [inline]
_copy_from_user+0x28/0xb0 lib/usercopy.c:18
copy_from_user include/linux/uaccess.h:212 [inline]
get_timespec64+0x97/0x280 kernel/time/time.c:877
__do_sys_clock_nanosleep kernel/time/posix-timers.c:1391 [inline]
__se_sys_clock_nanosleep+0x1a5/0x3c0 kernel/time/posix-timers.c:1379
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3d4e3bfa25
Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 f6 54 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 4f 55 ff ff 48 8b 04 24 48 83 c4 28 f7 d8
RSP: 002b:00007ffcef526d70 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 00000000000001ef RCX: 00007f3d4e3bfa25
RDX: 00007ffcef526db0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffcef526e1c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000001388
R13: 00000000000927c0 R14: 000000000006677d R15: 00007ffcef526e70
Allocated by task 16190:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394
kasan_kmalloc include/linux/kasan.h:260 [inline]
__kmalloc_cache_noprof+0x243/0x390 mm/slub.c:4325
kmalloc_noprof include/linux/slab.h:901 [inline]
kzalloc_noprof include/linux/slab.h:1037 [inline]
ip_vs_stats_alloc+0x50/0x170 net/netfilter/ipvs/ip_vs_ctl.c:942
ip_vs_est_add_kthread+0x412/0x750 net/netfilter/ipvs/ip_vs_est.c:339
ip_vs_start_estimator+0x1e3/0x350 net/netfilter/ipvs/ip_vs_est.c:500
ip_vs_control_net_init_sysctl net/netfilter/ipvs/ip_vs_ctl.c:4375 [inline]
ip_vs_control_net_init+0x12aa/0x17f0 net/netfilter/ipvs/ip_vs_ctl.c:4461
__ip_vs_init+0x2d2/0x460 net/netfilter/ipvs/ip_vs_core.c:2308
ops_init+0x349/0x5b0 net/core/net_namespace.c:138
setup_net+0x287/0x9e0 net/core/net_namespace.c:362
copy_net_ns+0x33f/0x570 net/core/net_namespace.c:516
create_new_namespaces+0x425/0x7b0 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0x124/0x180 kernel/nsproxy.c:228
ksys_unshare+0x57d/0xa70 kernel/fork.c:3342
__do_sys_unshare kernel/fork.c:3413 [inline]
__se_sys_unshare kernel/fork.c:3411 [inline]
__x64_sys_unshare+0x38/0x40 kernel/fork.c:3411
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 6147:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2353 [inline]
slab_free mm/slub.c:4609 [inline]
kfree+0x196/0x430 mm/slub.c:4757
ip_vs_est_kthread_destroy net/netfilter/ipvs/ip_vs_est.c:515 [inline]
ip_vs_stop_estimator+0xa65/0xf20 net/netfilter/ipvs/ip_vs_est.c:587
ip_vs_control_net_cleanup_sysctl net/netfilter/ipvs/ip_vs_ctl.c:4400 [inline]
ip_vs_control_net_cleanup+0x25b/0x3d0 net/netfilter/ipvs/ip_vs_ctl.c:4491
__ip_vs_cleanup_batch+0x8c/0x100 net/netfilter/ipvs/ip_vs_core.c:2354
ops_exit_list net/core/net_namespace.c:177 [inline]
cleanup_net+0x8ad/0xd60 net/core/net_namespace.c:652
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xabe/0x18e0 kernel/workqueue.c:3319
worker_thread+0x870/0xd30 kernel/workqueue.c:3400
kthread+0x7a9/0x920 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
The buggy address belongs to the object at ffff88805b330800
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
freed 512-byte region [ffff88805b330800, ffff88805b330a00)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88805b330800 pfn:0x5b330
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000240 ffff88801b041c80 ffffea00015ada10 ffffea0000a80d10
raw: ffff88805b330800 000000000010000f 00000000f5000000 0000000000000000
head: 00fff00000000240 ffff88801b041c80 ffffea00015ada10 ffffea0000a80d10
head: ffff88805b330800 000000000010000f 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea00016ccc01 ffffffffffffffff 0000000000000000
head: 0000000000000004 0000000000000000 00000000ffffffff 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 2949, tgid 2949 (kworker/u8:6), ts 75883299624, free_ts 25463478299
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551
prep_new_page mm/page_alloc.c:1559 [inline]
get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3477
__alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4739
alloc_pages_mpol+0x311/0x660 mm/mempolicy.c:2270
alloc_slab_page mm/slub.c:2423 [inline]
allocate_slab+0x8f/0x3a0 mm/slub.c:2587
new_slab mm/slub.c:2640 [inline]
___slab_alloc+0xc27/0x14a0 mm/slub.c:3826
__slab_alloc+0x58/0xa0 mm/slub.c:3916
__slab_alloc_node mm/slub.c:3991 [inline]
slab_alloc_node mm/slub.c:4152 [inline]
__do_kmalloc_node mm/slub.c:4293 [inline]
__kmalloc_noprof+0x2e6/0x4c0 mm/slub.c:4306
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1037 [inline]
fib6_info_alloc+0x2e/0xf0 net/ipv6/ip6_fib.c:155
ip6_route_info_create+0x445/0x12b0 net/ipv6/route.c:3766
addrconf_f6i_alloc+0x3c2/0x7f0 net/ipv6/route.c:4593
ipv6_add_addr+0x5b6/0x1090 net/ipv6/addrconf.c:1119
addrconf_add_linklocal+0x36c/0xa30 net/ipv6/addrconf.c:3308
addrconf_addr_gen+0x510/0xbb0
addrconf_dev_config net/ipv6/addrconf.c:3485 [inline]
addrconf_init_auto_addrs+0x96a/0xeb0 net/ipv6/addrconf.c:3563
addrconf_notify+0xaff/0x1020 net/ipv6/addrconf.c:3736
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:1127 [inline]
free_frozen_pages+0xe0d/0x10e0 mm/page_alloc.c:2660
free_contig_range+0x14c/0x430 mm/page_alloc.c:6678
destroy_args+0x94/0x4b0 mm/debug_vm_pgtable.c:1017
debug_vm_pgtable+0x551/0x590 mm/debug_vm_pgtable.c:1397
do_one_initcall+0x248/0x930 init/main.c:1257
do_initcall_level+0x157/0x210 init/main.c:1319
do_initcalls+0x71/0xd0 init/main.c:1335
kernel_init_freeable+0x435/0x5d0 init/main.c:1568
kernel_init+0x1d/0x2b0 init/main.c:1457
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Memory state around the buggy address:
ffff88805b330700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88805b330780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88805b330800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88805b330880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88805b330900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 2b 00 sub (%rax),%eax
2: 74 08 je 0xc
4: 4c 89 f7 mov %r14,%rdi
7: e8 ba 4f 8c 00 call 0x8c4fc6
c: f6 44 24 61 02 testb $0x2,0x61(%rsp)
11: 0f 85 85 01 00 00 jne 0x19c
17: 41 f7 c7 00 02 00 00 test $0x200,%r15d
1e: 74 01 je 0x21
20: fb sti
21: 48 c7 44 24 40 0e 36 movq $0x45e0360e,0x40(%rsp)
28: e0 45
* 2a: 4b c7 44 25 00 00 00 movq $0x0,0x0(%r13,%r12,1) <-- trapping instruction
31: 00 00
33: 43 c7 44 25 09 00 00 movl $0x0,0x9(%r13,%r12,1)
3a: 00 00
3c: 43 rex.XB
3d: c7 .byte 0xc7
3e: 44 rex.R
3f: 25 .byte 0x25