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BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x471/0x4b0
Read of size 2 at addr ffff888107ee882a by task modprobe/18074

CPU: 1 UID: 0 PID: 18074 Comm: modprobe Not tainted 6.16.0-rc6-syzkaller-00128-g81e0db8e8398 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <IRQ>
 dump_stack_lvl+0x189/0x250
 print_report+0xca/0x230
 kasan_report+0x118/0x150
 rose_timer_expiry+0x471/0x4b0
 call_timer_fn+0x17e/0x5f0
 __run_timer_base+0x61a/0x860
 run_timer_softirq+0xb7/0x180
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:set_fs_pwd+0x0/0x280
Code: ff e9 21 ff ff ff e8 7f ad 2a 09 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48
RSP: 0018:ffffc90006ee7e38 EFLAGS: 00000246
RAX: 1ffff11025f9d120 RBX: ffffc90006ee7e60 RCX: ffff88812fce8000
RDX: 0000000000000000 RSI: ffffc90006ee7e60 RDI: ffff888114bc2700
RBP: ffffc90006ee7ee0 R08: ffff88812fce8000 R09: 0000000000000002
R10: 0000000000006000 R11: 0000000000000000 R12: dffffc0000000000
R13: 1ffff92000ddcfc8 R14: ffff88812fce8900 R15: 0000000000000000
 __se_sys_chdir+0x1ae/0x280
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe0701cf267
Code: 0d 00 f7 d8 64 89 02 48 83 c8 ff 44 89 c7 48 89 04 24 e8 fb 2d fa ff 48 8b 04 24 48 83 c4 18 c3 c3 66 90 b8 50 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 91 9b 0d 00 f7 d8 64 89 01 48
RSP: 002b:00007ffcee7d64e8 EFLAGS: 00000202 ORIG_RAX: 0000000000000050
RAX: ffffffffffffffda RBX: 000055f11812f910 RCX: 00007fe0701cf267
RDX: 0000000000000000 RSI: 00007fe07026ef8c RDI: 00007fe070367735
RBP: 00007fe070367735 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000006c R11: 0000000000000202 R12: 0000000000000002
R13: 00007ffcee7d67a0 R14: 000055f10ab74169 R15: 00007fe0703b3a80
 </TASK>

Allocated by task 17779:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_cache_noprof+0x230/0x3d0
 __genradix_ptr_alloc+0x352/0x4a0
 __genradix_prealloc+0x44/0x90
 sctp_stream_init+0x14b/0x440
 sctp_association_new+0x10dd/0x25f0
 sctp_connect_new_asoc+0x2c5/0x690
 sctp_sendmsg+0x155c/0x2810
 __sock_sendmsg+0x19c/0x270
 __sys_sendto+0x3bd/0x520
 __x64_sys_sendto+0xde/0x100
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 17779:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x62/0x70
 kfree+0x18e/0x440
 genradix_free_recurse+0x5d/0xa0
 genradix_free_recurse+0x5d/0xa0
 sctp_stream_free+0xd5/0x110
 sctp_association_free+0x26d/0x7f0
 sctp_do_sm+0x3eba/0x5a20
 sctp_primitive_SHUTDOWN+0x98/0xc0
 sctp_close+0x409/0x900
 inet_release+0x144/0x190
 sock_close+0xc3/0x240
 __fput+0x44c/0xa70
 task_work_run+0x1d4/0x260
 get_signal+0x11ed/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 exit_to_user_mode_loop+0x75/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888107ee8800
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
 freed 512-byte region [ffff888107ee8800, ffff888107ee8a00)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888107ee8400 pfn:0x107ee8
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x57ff00000000240(workingset|head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000240 ffff88801a441c80 ffffea00043ce010 ffffea00041b5e10
raw: ffff888107ee8400 000000000010000c 00000000f5000000 0000000000000000
head: 057ff00000000240 ffff88801a441c80 ffffea00043ce010 ffffea00041b5e10
head: ffff888107ee8400 000000000010000c 00000000f5000000 0000000000000000
head: 057ff00000000002 ffffea00041fba01 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5700, tgid 5700 (kworker/u8:2), ts 66479705762, free_ts 66353531068
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x21e4/0x22c0
 __alloc_frozen_pages_noprof+0x181/0x370
 alloc_pages_mpol+0x232/0x4a0
 allocate_slab+0x8a/0x3b0
 ___slab_alloc+0xbfc/0x1480
 __kmalloc_cache_noprof+0x296/0x3d0
 __ipv6_dev_mc_inc+0x420/0xaf0
 addrconf_dad_work+0x3d0/0x14b0
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
page last free pid 5837 tgid 5837 stack trace:
 __free_frozen_pages+0xc71/0xe70
 __put_partials+0x161/0x1c0
 put_cpu_partial+0x17c/0x250
 __slab_free+0x2f7/0x400
 qlist_free_all+0x97/0x140
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 kmem_cache_alloc_node_noprof+0x1bb/0x3c0
 __alloc_skb+0x112/0x2d0
 netlink_ack+0x146/0xa50
 netlink_rcv_skb+0x28c/0x470
 netlink_unicast+0x75c/0x8e0
 netlink_sendmsg+0x805/0xb30
 __sock_sendmsg+0x21c/0x270
 __sys_sendto+0x3bd/0x520
 __x64_sys_sendto+0xde/0x100

Memory state around the buggy address:
 ffff888107ee8700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888107ee8780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888107ee8800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff888107ee8880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888107ee8900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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