==================================================================
BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x471/0x4b0 net/rose/rose_timer.c:183
Read of size 2 at addr ffff8880273e402a by task syz.4.4370/19832
CPU: 0 UID: 0 PID: 19832 Comm: syz.4.4370 Not tainted 6.15.0-rc5-syzkaller-00984-gd97e2634fbdc #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:__raw_write_unlock_irq include/linux/rwlock_api_smp.h:274 [inline]
RIP: 0010:_raw_write_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:358
Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 aa 77 44 f6 48 89 df e8 b2 17 45 f6 e8 9d 96 6d f6 fb bf 01 00 00 00 e2 18 37 f6 65 8b 05 4b 49 1c 07 85 c0 74 07 5b c3 cc cc cc cc
RSP: 0018:ffffc9000bf17ad0 EFLAGS: 00000286
RAX: 37e181f637c92700 RBX: ffff88802f7a2940 RCX: 37e181f637c92700
RDX: 0000000000000006 RSI: ffffffff8d75179c RDI: 0000000000000001
RBP: ffffc9000bf17c10 R08: ffffffff8f7f2c77 R09: 1ffffffff1efe58e
R10: dffffc0000000000 R11: fffffbfff1efe58f R12: ffffc9000bf17b80
R13: dffffc0000000000 R14: ffff88802f7a2800 R15: 0000000000000000
ep_send_events fs/eventpoll.c:1937 [inline]
ep_try_send_events+0xd93/0xf40 fs/eventpoll.c:1993
ep_poll fs/eventpoll.c:2058 [inline]
do_epoll_wait+0x53f/0xf30 fs/eventpoll.c:2531
__do_sys_epoll_wait fs/eventpoll.c:2539 [inline]
__se_sys_epoll_wait fs/eventpoll.c:2534 [inline]
__x64_sys_epoll_wait+0x1be/0x210 fs/eventpoll.c:2534
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
RIP: 0033:0x7f329138e969
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:00007f329221f038 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 00007f32915b6160 RCX: 00007f329138e969
RDX: 0000000000000003 RSI: 0000200000000240 RDI: 0000000000000007
RBP: 00007f3291410ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000009 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f32915b6160 R15: 00007ffdded41628
Allocated by task 18616:
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:4327 [inline]
__kmalloc_noprof+0x27a/0x4f0 mm/slub.c:4339
kmalloc_noprof include/linux/slab.h:909 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
copy_splice_read+0x143/0x9b0 fs/splice.c:337
do_splice_read fs/splice.c:978 [inline]
splice_direct_to_actor+0x4d0/0xcc0 fs/splice.c:1083
do_splice_direct_actor fs/splice.c:1201 [inline]
do_splice_direct+0x181/0x270 fs/splice.c:1227
do_sendfile+0x4da/0x7d0 fs/read_write.c:1368
__do_sys_sendfile64 fs/read_write.c:1429 [inline]
__se_sys_sendfile64+0x13e/0x190 fs/read_write.c:1415
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 18616:
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:2380 [inline]
slab_free mm/slub.c:4642 [inline]
kfree+0x193/0x440 mm/slub.c:4841
copy_splice_read+0x881/0x9b0 fs/splice.c:397
do_splice_read fs/splice.c:978 [inline]
splice_direct_to_actor+0x4d0/0xcc0 fs/splice.c:1083
do_splice_direct_actor fs/splice.c:1201 [inline]
do_splice_direct+0x181/0x270 fs/splice.c:1227
do_sendfile+0x4da/0x7d0 fs/read_write.c:1368
__do_sys_sendfile64 fs/read_write.c:1429 [inline]
__se_sys_sendfile64+0x13e/0x190 fs/read_write.c:1415
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
The buggy address belongs to the object at ffff8880273e4000
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
freed 512-byte region [ffff8880273e4000, ffff8880273e4200)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880273e6000 pfn:0x273e4
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 ffff88801a041c80 ffffea0001f20010 ffffea0001918610
raw: ffff8880273e6000 0000000000100008 00000000f5000000 0000000000000000
head: 00fff00000000240 ffff88801a041c80 ffffea0001f20010 ffffea0001918610
head: ffff8880273e6000 0000000000100008 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea00009cf901 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 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5839, tgid 5839 (syz-executor), ts 95957388481, free_ts 95816553239
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1d8/0x230 mm/page_alloc.c:1714
prep_new_page mm/page_alloc.c:1722 [inline]
get_page_from_freelist+0x21e0/0x22c0 mm/page_alloc.c:3684
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4966
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2301
alloc_slab_page mm/slub.c:2450 [inline]
allocate_slab+0x8a/0x3b0 mm/slub.c:2618
new_slab mm/slub.c:2672 [inline]
___slab_alloc+0xbfc/0x1480 mm/slub.c:3858
__slab_alloc mm/slub.c:3948 [inline]
__slab_alloc_node mm/slub.c:4023 [inline]
slab_alloc_node mm/slub.c:4184 [inline]
__do_kmalloc_node mm/slub.c:4326 [inline]
__kmalloc_noprof+0x305/0x4f0 mm/slub.c:4339
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+0x147/0xa70 net/ipv6/route.c:3782
ip6_route_add+0x29/0x2f0 net/ipv6/route.c:3909
addrconf_prefix_route net/ipv6/addrconf.c:2487 [inline]
addrconf_add_linklocal+0x45f/0x6c0 net/ipv6/addrconf.c:3312
addrconf_addr_gen+0x490/0x580 net/ipv6/addrconf.c:3441
addrconf_init_auto_addrs+0x711/0xb50 net/ipv6/addrconf.c:-1
addrconf_notify+0xacc/0x1010 net/ipv6/addrconf.c:3744
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2266 [inline]
call_netdevice_notifiers net/core/dev.c:2280 [inline]
__dev_notify_flags+0x18d/0x2e0 net/core/dev.c:-1
page last free pid 5913 tgid 5913 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1258 [inline]
__free_frozen_pages+0xb14/0xce0 mm/page_alloc.c:2721
__slab_free+0x326/0x400 mm/slub.c:4553
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:4147 [inline]
slab_alloc_node mm/slub.c:4196 [inline]
kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4203
new_handle fs/jbd2/transaction.c:457 [inline]
jbd2__journal_start+0x146/0x5b0 fs/jbd2/transaction.c:484
__ext4_journal_start_sb+0x227/0x5c0 fs/ext4/ext4_jbd2.c:114
__ext4_journal_start fs/ext4/ext4_jbd2.h:242 [inline]
ext4_dirty_inode+0x93/0x110 fs/ext4/inode.c:6100
__mark_inode_dirty+0x2ce/0xdf0 fs/fs-writeback.c:2527
generic_update_time fs/inode.c:2064 [inline]
inode_update_time fs/inode.c:2077 [inline]
__file_update_time fs/inode.c:2305 [inline]
file_update_time+0x40c/0x490 fs/inode.c:2335
ext4_page_mkwrite+0x1f5/0x1110 fs/ext4/inode.c:6221
do_page_mkwrite+0x14a/0x310 mm/memory.c:3287
do_shared_fault mm/memory.c:5594 [inline]
do_fault mm/memory.c:5656 [inline]
do_pte_missing mm/memory.c:4160 [inline]
handle_pte_fault mm/memory.c:5997 [inline]
__handle_mm_fault+0x18d2/0x5380 mm/memory.c:6140
handle_mm_fault+0x3f6/0x8c0 mm/memory.c:6309
do_user_addr_fault+0xa81/0x1390 arch/x86/mm/fault.c:1337
Memory state around the buggy address:
ffff8880273e3f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880273e3f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880273e4000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880273e4080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880273e4100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 90 nop
1: f3 0f 1e fa endbr64
5: 53 push %rbx
6: 48 89 fb mov %rdi,%rbx
9: 48 83 c7 18 add $0x18,%rdi
d: 48 8b 74 24 08 mov 0x8(%rsp),%rsi
12: e8 aa 77 44 f6 call 0xf64477c1
17: 48 89 df mov %rbx,%rdi
1a: e8 b2 17 45 f6 call 0xf64517d1
1f: e8 9d 96 6d f6 call 0xf66d96c1
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 e2 18 37 f6 call 0xf6371911 <-- trapping instruction
2f: 65 8b 05 4b 49 1c 07 mov %gs:0x71c494b(%rip),%eax # 0x71c4981
36: 85 c0 test %eax,%eax
38: 74 07 je 0x41
3a: 5b pop %rbx
3b: c3 ret
3c: cc int3
3d: cc int3
3e: cc int3
3f: cc int3