EXT4-fs (loop2): mounted filesystem without journal. Opts: grpquota,delalloc,resuid=0x0000000000000000,debug,dioread_nolock,bsddf,nomblk_io_submit,noauto_da_alloc,,errors=continue overlayfs: bad mount option "redirect_dir=on\metacopy=off" ================================================================== BUG: KASAN: use-after-free in ext4_get_inode_usage+0x3a1/0x520 fs/ext4/xattr.c:817 Read of size 4 at addr ffff8881120f8070 by task syz.2.2479/8498 CPU: 0 PID: 8498 Comm: syz.2.2479 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0xe2/0x130 mm/kasan/report.c:452 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308 ext4_get_inode_usage+0x3a1/0x520 fs/ext4/xattr.c:817 __dquot_transfer+0x192/0x20d0 fs/quota/dquot.c:2017 dquot_transfer+0x2f1/0x460 fs/quota/dquot.c:2169 ext4_setattr+0x715/0x1950 fs/ext4/inode.c:5577 notify_change+0xab3/0xe40 fs/attr.c:410 chown_common+0x335/0x500 fs/open.c:675 vfs_fchown fs/open.c:742 [inline] ksys_fchown+0xef/0x160 fs/open.c:753 __do_sys_fchown fs/open.c:761 [inline] __se_sys_fchown fs/open.c:759 [inline] __x64_sys_fchown+0x7a/0x90 fs/open.c:759 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f0db3150e59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0db1bab028 EFLAGS: 00000246 ORIG_RAX: 000000000000005d RAX: ffffffffffffffda RBX: 00007f0db33c9fa0 RCX: 00007f0db3150e59 RDX: 000000000000ee01 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 00007f0db31e6d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0db33ca038 R14: 00007f0db33c9fa0 R15: 00007ffca7b35ec8 Allocated by task 8200: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:430 [inline] ____kasan_kmalloc mm/kasan/common.c:509 [inline] __kasan_kmalloc+0xda/0x110 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] __kmalloc+0x1a4/0x330 mm/slub.c:4038 kmalloc_array include/linux/slab.h:595 [inline] realloc_stack_state kernel/bpf/verifier.c:762 [inline] realloc_func_state+0x301/0x5b0 kernel/bpf/verifier.c:778 copy_func_state kernel/bpf/verifier.c:871 [inline] copy_verifier_state+0x65f/0xc20 kernel/bpf/verifier.c:918 push_stack+0x19b/0x4f0 kernel/bpf/verifier.c:989 check_cond_jmp_op kernel/bpf/verifier.c:8303 [inline] do_check+0xb801/0xdf60 kernel/bpf/verifier.c:10335 do_check_common+0x8e7/0x1190 kernel/bpf/verifier.c:12069 do_check_main kernel/bpf/verifier.c:12132 [inline] bpf_check+0x9623/0xdb10 kernel/bpf/verifier.c:12687 bpf_prog_load+0xfca/0x14a0 kernel/bpf/syscall.c:2234 __do_sys_bpf kernel/bpf/syscall.c:4435 [inline] __se_sys_bpf+0x49a/0x740 kernel/bpf/syscall.c:4391 __x64_sys_bpf+0x7b/0x90 kernel/bpf/syscall.c:4391 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 8200: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4a/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:362 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370 kasan_slab_free include/linux/kasan.h:220 [inline] slab_free_hook mm/slub.c:1600 [inline] slab_free_freelist_hook+0xc5/0x190 mm/slub.c:1626 slab_free mm/slub.c:3208 [inline] kfree+0xc0/0x270 mm/slub.c:4196 free_func_state kernel/bpf/verifier.c:838 [inline] free_verifier_state+0xd6/0x220 kernel/bpf/verifier.c:855 pop_stack kernel/bpf/verifier.c:964 [inline] push_stack+0x2ac/0x4f0 kernel/bpf/verifier.c:1015 check_cond_jmp_op kernel/bpf/verifier.c:8303 [inline] do_check+0xb801/0xdf60 kernel/bpf/verifier.c:10335 do_check_common+0x8e7/0x1190 kernel/bpf/verifier.c:12069 do_check_main kernel/bpf/verifier.c:12132 [inline] bpf_check+0x9623/0xdb10 kernel/bpf/verifier.c:12687 bpf_prog_load+0xfca/0x14a0 kernel/bpf/syscall.c:2234 __do_sys_bpf kernel/bpf/syscall.c:4435 [inline] __se_sys_bpf+0x49a/0x740 kernel/bpf/syscall.c:4391 __x64_sys_bpf+0x7b/0x90 kernel/bpf/syscall.c:4391 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff8881120f8000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 112 bytes inside of 8192-byte region [ffff8881120f8000, ffff8881120fa000) The buggy address belongs to the page: page:ffffea0004483e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8881120fc000 pfn:0x1120f8 head:ffffea0004483e00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 ffffea0004532808 ffffea00049eca08 ffff888100042a80 raw: ffff8881120fc000 0000000000020001 00000001ffffffff 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 8200, ts 322153945988, free_ts 322152664152 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x179/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x223b/0x23d0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x290/0x620 mm/page_alloc.c:5384 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1813 [inline] new_slab+0x84/0x3f0 mm/slub.c:1874 new_slab_objects mm/slub.c:2632 [inline] ___slab_alloc+0x2a6/0x450 mm/slub.c:2796 __slab_alloc+0x63/0xa0 mm/slub.c:2836 slab_alloc_node mm/slub.c:2918 [inline] slab_alloc mm/slub.c:2960 [inline] __kmalloc+0x1fe/0x330 mm/slub.c:4034 kmalloc_array include/linux/slab.h:595 [inline] realloc_stack_state kernel/bpf/verifier.c:762 [inline] realloc_func_state+0x301/0x5b0 kernel/bpf/verifier.c:778 copy_func_state kernel/bpf/verifier.c:871 [inline] copy_verifier_state+0x65f/0xc20 kernel/bpf/verifier.c:918 push_stack+0x19b/0x4f0 kernel/bpf/verifier.c:989 check_cond_jmp_op kernel/bpf/verifier.c:8303 [inline] do_check+0xb801/0xdf60 kernel/bpf/verifier.c:10335 do_check_common+0x8e7/0x1190 kernel/bpf/verifier.c:12069 do_check_main kernel/bpf/verifier.c:12132 [inline] bpf_check+0x9623/0xdb10 kernel/bpf/verifier.c:12687 bpf_prog_load+0xfca/0x14a0 kernel/bpf/syscall.c:2234 __do_sys_bpf kernel/bpf/syscall.c:4435 [inline] __se_sys_bpf+0x49a/0x740 kernel/bpf/syscall.c:4391 __x64_sys_bpf+0x7b/0x90 kernel/bpf/syscall.c:4391 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] __free_pages_ok+0x80b/0x830 mm/page_alloc.c:1629 free_the_page mm/page_alloc.c:5445 [inline] __free_pages+0xd8/0x3b0 mm/page_alloc.c:5454 __free_slab+0xcf/0x190 mm/slub.c:1899 free_slab mm/slub.c:1914 [inline] discard_slab+0x29/0x40 mm/slub.c:1920 __slab_free+0x313/0x3a0 mm/slub.c:3136 do_slab_free mm/slub.c:3196 [inline] ___cache_free+0x10e/0x130 mm/slub.c:3215 qlink_free+0x50/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14a/0x160 mm/kasan/quarantine.c:283 ____kasan_kmalloc mm/kasan/common.c:475 [inline] __kasan_krealloc+0xaa/0x1b0 mm/kasan/common.c:577 kasan_krealloc include/linux/kasan.h:274 [inline] __do_krealloc mm/slab_common.c:1099 [inline] krealloc+0xce/0x110 mm/slab_common.c:1136 push_jmp_history kernel/bpf/verifier.c:1787 [inline] is_state_visited kernel/bpf/verifier.c:9934 [inline] do_check+0x2ccd/0xdf60 kernel/bpf/verifier.c:10078 do_check_common+0x8e7/0x1190 kernel/bpf/verifier.c:12069 do_check_main kernel/bpf/verifier.c:12132 [inline] bpf_check+0x9623/0xdb10 kernel/bpf/verifier.c:12687 bpf_prog_load+0xfca/0x14a0 kernel/bpf/syscall.c:2234 __do_sys_bpf kernel/bpf/syscall.c:4435 [inline] __se_sys_bpf+0x49a/0x740 kernel/bpf/syscall.c:4391 Memory state around the buggy address: ffff8881120f7f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881120f7f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881120f8000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881120f8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881120f8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================