================================================================== 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_inaccessible include/linux/pagemap.h:326 [inline] BUG: KASAN: slab-use-after-free in isolate_migratepages_block+0x2228/0x64f0 mm/compaction.c:1210 Read of size 8 at addr ffff88802093bf90 by task syz.2.1511/13133 CPU: 0 UID: 0 PID: 13133 Comm: syz.2.1511 Not tainted 6.11.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 kasan_check_range+0x282/0x290 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_inaccessible include/linux/pagemap.h:326 [inline] isolate_migratepages_block+0x2228/0x64f0 mm/compaction.c:1210 isolate_migratepages mm/compaction.c:2194 [inline] compact_zone+0x32e6/0x4af0 mm/compaction.c:2641 compact_node mm/compaction.c:2935 [inline] compact_nodes mm/compaction.c:2957 [inline] sysctl_compaction_handler+0x496/0x990 mm/compaction.c:3008 proc_sys_call_handler+0x551/0x8b0 fs/proc/proc_sysctl.c:590 iter_file_splice_write+0xbd7/0x14e0 fs/splice.c:743 do_splice_from fs/splice.c:941 [inline] direct_splice_actor+0x11e/0x220 fs/splice.c:1164 splice_direct_to_actor+0x58e/0xc90 fs/splice.c:1108 do_splice_direct_actor fs/splice.c:1207 [inline] do_splice_direct+0x28c/0x3e0 fs/splice.c:1233 do_sendfile+0x56d/0xe20 fs/read_write.c:1295 __do_sys_sendfile64 fs/read_write.c:1356 [inline] __se_sys_sendfile64+0x100/0x1e0 fs/read_write.c:1348 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: 0033:0x7f22ff579e79 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:00007f2300384038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f22ff716058 RCX: 00007f22ff579e79 RDX: 00000000200001c0 RSI: 000000000000000c RDI: 000000000000000d RBP: 00007f22ff5e793e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000009 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f22ff716058 R15: 00007f22ff83fa38 Allocated by task 27: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3988 [inline] slab_alloc_node mm/slub.c:4037 [inline] kmem_cache_alloc_lru_noprof+0x139/0x2b0 mm/slub.c:4056 shmem_alloc_inode+0x28/0x40 mm/shmem.c:4622 alloc_inode fs/inode.c:263 [inline] new_inode_pseudo fs/inode.c:1073 [inline] new_inode+0x6e/0x310 fs/inode.c:1092 __shmem_get_inode mm/shmem.c:2658 [inline] shmem_get_inode+0x34a/0xd50 mm/shmem.c:2729 shmem_mknod+0x5f/0x1e0 mm/shmem.c:3426 vfs_mknod+0x36d/0x3b0 fs/namei.c:4088 handle_create drivers/base/devtmpfs.c:219 [inline] handle drivers/base/devtmpfs.c:384 [inline] devtmpfs_work_loop+0x963/0x1040 drivers/base/devtmpfs.c:399 devtmpfsd+0x4c/0x50 drivers/base/devtmpfs.c:441 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Freed by task 16: 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:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2252 [inline] slab_free mm/slub.c:4473 [inline] kmem_cache_free+0x145/0x350 mm/slub.c:4548 rcu_do_batch kernel/rcu/tree.c:2569 [inline] rcu_core+0xafd/0x1830 kernel/rcu/tree.c:2843 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554 run_ksoftirqd+0xca/0x130 kernel/softirq.c:928 smpboot_thread_fn+0x544/0xa30 kernel/smpboot.c:164 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/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+0x3f/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541 __call_rcu_common kernel/rcu/tree.c:3106 [inline] call_rcu+0x167/0xa70 kernel/rcu/tree.c:3210 destroy_inode fs/inode.c:318 [inline] evict+0x88b/0x950 fs/inode.c:729 do_unlinkat+0x512/0x830 fs/namei.c:4493 __do_sys_unlink fs/namei.c:4534 [inline] __se_sys_unlink fs/namei.c:4532 [inline] __x64_sys_unlink+0x47/0x50 fs/namei.c:4532 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 The buggy address belongs to the object at ffff88802093bac8 which belongs to the cache shmem_inode_cache of size 1544 The buggy address is located 1224 bytes inside of freed 1544-byte region [ffff88802093bac8, ffff88802093c0d0) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x20938 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: 0xfdffffff(slab) raw: 00fff00000000040 ffff8880172e7140 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000130013 00000001fdffffff 0000000000000000 head: 00fff00000000040 ffff8880172e7140 dead000000000122 0000000000000000 head: 0000000000000000 0000000000130013 00000001fdffffff 0000000000000000 head: 00fff00000000003 ffffea0000824e01 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 27, tgid 27 (kdevtmpfs), ts 9494643749, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493 prep_new_page mm/page_alloc.c:1501 [inline] get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3439 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4695 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2321 allocate_slab+0x5a/0x2f0 mm/slub.c:2484 new_slab mm/slub.c:2537 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3723 __slab_alloc+0x58/0xa0 mm/slub.c:3813 __slab_alloc_node mm/slub.c:3866 [inline] slab_alloc_node mm/slub.c:4025 [inline] kmem_cache_alloc_lru_noprof+0x1c5/0x2b0 mm/slub.c:4056 shmem_alloc_inode+0x28/0x40 mm/shmem.c:4622 alloc_inode fs/inode.c:263 [inline] new_inode_pseudo fs/inode.c:1073 [inline] new_inode+0x6e/0x310 fs/inode.c:1092 __shmem_get_inode mm/shmem.c:2658 [inline] shmem_get_inode+0x34a/0xd50 mm/shmem.c:2729 shmem_mknod+0x5f/0x1e0 mm/shmem.c:3426 vfs_mknod+0x36d/0x3b0 fs/namei.c:4088 handle_create drivers/base/devtmpfs.c:219 [inline] handle drivers/base/devtmpfs.c:384 [inline] devtmpfs_work_loop+0x963/0x1040 drivers/base/devtmpfs.c:399 devtmpfsd+0x4c/0x50 drivers/base/devtmpfs.c:441 kthread+0x2f0/0x390 kernel/kthread.c:389 page_owner free stack trace missing Memory state around the buggy address: ffff88802093be80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802093bf00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802093bf80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802093c000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802093c080: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc ==================================================================