syzbot

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BUG: KASAN: slab-use-after-free in instrument_atomic_read include/linux/instrumented.h:68 [inline]
BUG: KASAN: slab-use-after-free in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
BUG: KASAN: slab-use-after-free in mapping_unevictable include/linux/pagemap.h:269 [inline]
BUG: KASAN: slab-use-after-free in folio_evictable mm/internal.h:435 [inline]
BUG: KASAN: slab-use-after-free in lru_add+0x192/0xd70 mm/swap.c:136
Read of size 8 at addr ffff888024b24618 by task syz.7.1236/11255

CPU: 0 UID: 0 PID: 11255 Comm: syz.7.1236 Not tainted 6.12.0-syzkaller-11677-g2ba9f676d0a2 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xc3/0x620 mm/kasan/report.c:489
 kasan_report+0xd9/0x110 mm/kasan/report.c:602
 check_region_inline mm/kasan/generic.c:183 [inline]
 kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 mapping_unevictable include/linux/pagemap.h:269 [inline]
 folio_evictable mm/internal.h:435 [inline]
 lru_add+0x192/0xd70 mm/swap.c:136
 folio_batch_move_lru+0x113/0x3b0 mm/swap.c:168
 lru_add_drain_cpu+0x521/0x810 mm/swap.c:616
 lru_add_drain+0x109/0x440 mm/swap.c:698
 vms_clear_ptes+0x1f8/0x780 mm/vma.c:1133
 vms_clean_up_area mm/vma.c:1155 [inline]
 __mmap_prepare mm/vma.c:2278 [inline]
 __mmap_region+0x4c9/0x2670 mm/vma.c:2443
 mmap_region+0x127/0x320 mm/mmap.c:1347
 do_mmap+0xc00/0xfc0 mm/mmap.c:496
 vm_mmap_pgoff+0x1ba/0x360 mm/util.c:580
 ksys_mmap_pgoff+0x1c8/0x5c0 mm/mmap.c:542
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
 __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f26a0980849
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:00007f26a1845058 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f26a0b45fa0 RCX: 00007f26a0980849
RDX: 0000000000000002 RSI: 0000000000800000 RDI: 0000000020800000
RBP: 00007f26a09f3986 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000042032 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f26a0b45fa0 R15: 00007ffd234568e8
 </TASK>

Allocated by task 37:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:319 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:345
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4104 [inline]
 slab_alloc_node mm/slub.c:4153 [inline]
 kmem_cache_alloc_lru_noprof+0x226/0x3d0 mm/slub.c:4172
 shmem_alloc_inode+0x25/0x50 mm/shmem.c:4980
 alloc_inode+0x5d/0x230 fs/inode.c:336
 new_inode_pseudo fs/inode.c:1174 [inline]
 new_inode+0x22/0x210 fs/inode.c:1193
 __shmem_get_inode mm/shmem.c:2874 [inline]
 shmem_get_inode+0x194/0xf00 mm/shmem.c:2948
 shmem_mknod+0x1a8/0x450 mm/shmem.c:3670
 vfs_mknod+0x5d7/0x8e0 fs/namei.c:4189
 handle_create drivers/base/devtmpfs.c:219 [inline]
 handle drivers/base/devtmpfs.c:384 [inline]
 devtmpfs_work_loop+0x1a8/0x7d0 drivers/base/devtmpfs.c:399
 devtmpfsd+0x4c/0x50 drivers/base/devtmpfs.c:441
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Freed by task 29:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:582
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2338 [inline]
 slab_free mm/slub.c:4598 [inline]
 kmem_cache_free+0x152/0x4c0 mm/slub.c:4700
 i_callback+0x43/0x70 fs/inode.c:325
 rcu_do_batch kernel/rcu/tree.c:2567 [inline]
 rcu_core+0x79d/0x14d0 kernel/rcu/tree.c:2823
 handle_softirqs+0x213/0x8f0 kernel/softirq.c:554
 run_ksoftirqd kernel/softirq.c:943 [inline]
 run_ksoftirqd+0x3a/0x60 kernel/softirq.c:935
 smpboot_thread_fn+0x661/0xa30 kernel/smpboot.c:164
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Last potentially related work creation:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 __kasan_record_aux_stack+0xba/0xd0 mm/kasan/generic.c:544
 __call_rcu_common.constprop.0+0x99/0x7a0 kernel/rcu/tree.c:3086
 destroy_inode+0x12c/0x1b0 fs/inode.c:391
 evict+0x5ed/0x960 fs/inode.c:827
 iput_final fs/inode.c:1946 [inline]
 iput fs/inode.c:1972 [inline]
 iput+0x52a/0x890 fs/inode.c:1958
 do_unlinkat+0x5c3/0x760 fs/namei.c:4594
 __do_sys_unlink fs/namei.c:4635 [inline]
 __se_sys_unlink fs/namei.c:4633 [inline]
 __x64_sys_unlink+0xc5/0x110 fs/namei.c:4633
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888024b24150
 which belongs to the cache shmem_inode_cache of size 1544
The buggy address is located 1224 bytes inside of
 freed 1544-byte region [ffff888024b24150, ffff888024b24758)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x24b20
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801ca8e780 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000130013 00000001f5000000 0000000000000000
head: 00fff00000000040 ffff88801ca8e780 dead000000000122 0000000000000000
head: 0000000000000000 0000000000130013 00000001f5000000 0000000000000000
head: 00fff00000000003 ffffea000092c801 ffffffffffffffff 0000000000000000
head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 37, tgid 37 (kdevtmpfs), ts 6023947933, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1556
 prep_new_page mm/page_alloc.c:1564 [inline]
 get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3474
 __alloc_pages_noprof+0x223/0x25b0 mm/page_alloc.c:4751
 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2265
 alloc_slab_page mm/slub.c:2408 [inline]
 allocate_slab mm/slub.c:2574 [inline]
 new_slab+0x2c9/0x410 mm/slub.c:2627
 ___slab_alloc+0xdac/0x1870 mm/slub.c:3815
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3905
 __slab_alloc_node mm/slub.c:3980 [inline]
 slab_alloc_node mm/slub.c:4141 [inline]
 kmem_cache_alloc_lru_noprof+0xff/0x3d0 mm/slub.c:4172
 shmem_alloc_inode+0x25/0x50 mm/shmem.c:4980
 alloc_inode+0x5d/0x230 fs/inode.c:336
 new_inode_pseudo fs/inode.c:1174 [inline]
 new_inode+0x22/0x210 fs/inode.c:1193
 __shmem_get_inode mm/shmem.c:2874 [inline]
 shmem_get_inode+0x194/0xf00 mm/shmem.c:2948
 shmem_mknod+0x1a8/0x450 mm/shmem.c:3670
 vfs_mknod+0x5d7/0x8e0 fs/namei.c:4189
 handle_create drivers/base/devtmpfs.c:219 [inline]
 handle drivers/base/devtmpfs.c:384 [inline]
 devtmpfs_work_loop+0x1a8/0x7d0 drivers/base/devtmpfs.c:399
 devtmpfsd+0x4c/0x50 drivers/base/devtmpfs.c:441
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888024b24500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888024b24580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888024b24600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff888024b24680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888024b24700: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
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