EXT4-fs (loop5): Warning: mounting with an experimental mount option 'dioread_nolock' for blocksize < PAGE_SIZE [EXT4 FS bs=1024, gc=1, bpg=131072, ipg=32, mo=e855c01c, mo2=0003] System zones: 0-1, 3-36 EXT4-fs (loop5): mounted filesystem without journal. Opts: grpquota,delalloc,resuid=0x0000000000000000,debug,dioread_nolock,bsddf,nomblk_io_submit,noauto_da_alloc,,errors=continue ================================================================== BUG: KASAN: use-after-free in ext4_get_inode_usage+0x3a1/0x520 fs/ext4/xattr.c:817 Read of size 4 at addr ffff88810ed97004 by task syz.5.548/2329 CPU: 1 PID: 2329 Comm: syz.5.548 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: 0033:0x7f85a18b5e59 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:00007f85a0310028 EFLAGS: 00000246 ORIG_RAX: 000000000000005d RAX: ffffffffffffffda RBX: 00007f85a1b2efa0 RCX: 00007f85a18b5e59 RDX: 000000000000ee01 RSI: 0000000000000000 RDI: 0000000000000007 RBP: 00007f85a194bd6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f85a1b2f038 R14: 00007f85a1b2efa0 R15: 00007ffc251338f8 Allocated by task 1959: 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_krealloc+0x157/0x1b0 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 __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 1959: 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 krealloc+0xe3/0x110 mm/slab_common.c:-1 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 __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 ffff88810ed97000 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 4 bytes inside of 32-byte region [ffff88810ed97000, ffff88810ed97020) The buggy address belongs to the page: page:ffffea00043b65c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10ed97 flags: 0x4000000000000200(slab) raw: 4000000000000200 ffffea00044fc580 0000000f0000000f ffff888100043980 raw: 0000000000000000 0000000000400040 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 214, ts 12657942212, free_ts 12656393044 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 include/linux/slab.h:560 [inline] kzalloc include/linux/slab.h:667 [inline] lsm_cred_alloc security/security.c:500 [inline] security_prepare_creds+0x4e/0x140 security/security.c:1639 prepare_creds+0x3f1/0x5d0 kernel/cred.c:288 access_override_creds fs/open.c:354 [inline] do_faccessat+0xeb/0x970 fs/open.c:418 __do_sys_access fs/open.c:483 [inline] __se_sys_access fs/open.c:481 [inline] __x64_sys_access+0x61/0x70 fs/open.c:481 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb 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_pcp_prepare mm/page_alloc.c:1421 [inline] free_unref_page_prepare+0x2b7/0x2d0 mm/page_alloc.c:3336 free_unref_page mm/page_alloc.c:3391 [inline] free_the_page mm/page_alloc.c:5443 [inline] __free_pages+0x146/0x3b0 mm/page_alloc.c:5454 free_pages+0x82/0x90 mm/page_alloc.c:5465 selinux_genfs_get_sid+0x20b/0x250 security/selinux/hooks.c:1332 inode_doinit_with_dentry+0x879/0xd70 security/selinux/hooks.c:1529 selinux_d_instantiate+0x27/0x40 security/selinux/hooks.c:6395 security_d_instantiate+0x9e/0xf0 security/security.c:1980 d_splice_alias+0x6d/0x390 fs/dcache.c:3038 proc_sys_lookup+0x517/0x610 fs/proc/proc_sysctl.c:534 lookup_open fs/namei.c:3234 [inline] open_last_lookups fs/namei.c:3325 [inline] path_openat+0x1140/0x31c0 fs/namei.c:3514 do_filp_open+0x1e2/0x410 fs/namei.c:3544 do_sys_openat2+0x19f/0x750 fs/open.c:1219 do_sys_open fs/open.c:1235 [inline] __do_sys_openat fs/open.c:1251 [inline] __se_sys_openat fs/open.c:1246 [inline] __x64_sys_openat+0x136/0x160 fs/open.c:1246 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Memory state around the buggy address: ffff88810ed96f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88810ed96f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88810ed97000: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ^ ffff88810ed97080: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ffff88810ed97100: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ==================================================================