================================================================== BUG: KASAN: slab-out-of-bounds in diWrite+0x1209/0x1f40 fs/jfs/jfs_imap.c:753 Write of size 32 at addr ffff88803336e200 by task syz.5.62/6455 CPU: 0 UID: 0 PID: 6455 Comm: syz.5.62 Not tainted 6.15.0-syzkaller-08486-gf66bc387efbe #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xd2/0x2b0 mm/kasan/report.c:521 kasan_report+0x118/0x150 mm/kasan/report.c:634 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:189 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106 diWrite+0x1209/0x1f40 fs/jfs/jfs_imap.c:753 txCommit+0x852/0x5430 fs/jfs/jfs_txnmgr.c:1255 add_missing_indices+0x8ce/0xce0 fs/jfs/jfs_dtree.c:2674 jfs_readdir+0x1d8f/0x3ae0 fs/jfs/jfs_dtree.c:3031 wrap_directory_iterator+0x93/0xe0 fs/readdir.c:65 iterate_dir+0x5ac/0x770 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:410 [inline] __se_sys_getdents64+0xe4/0x260 fs/readdir.c:396 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ffa3238e969 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:00007ffa3316c038 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00007ffa325b6080 RCX: 00007ffa3238e969 RDX: 0000000000001000 RSI: 0000200000000f80 RDI: 0000000000000006 RBP: 00007ffa32410ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffa325b6080 R15: 00007ffdecd81af8 Allocated by task 5192: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4147 [inline] slab_alloc_node mm/slub.c:4196 [inline] kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4203 ep_insert+0x272/0x1a00 fs/eventpoll.c:1671 do_epoll_ctl+0x7f2/0xe80 fs/eventpoll.c:2411 __do_sys_epoll_ctl fs/eventpoll.c:2462 [inline] __se_sys_epoll_ctl fs/eventpoll.c:2453 [inline] __x64_sys_epoll_ctl+0x163/0x1a0 fs/eventpoll.c:2453 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 49: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2380 [inline] slab_free_freelist_hook mm/slub.c:2409 [inline] slab_free_bulk mm/slub.c:4666 [inline] kmem_cache_free_bulk+0x2d1/0x520 mm/slub.c:5243 kfree_bulk include/linux/slab.h:794 [inline] kvfree_rcu_bulk+0xe5/0x1e0 mm/slab_common.c:1516 kfree_rcu_work+0xed/0x170 mm/slab_common.c:1594 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:47 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:548 kvfree_call_rcu+0xbb/0x410 mm/slab_common.c:1962 __ep_remove+0x519/0x790 fs/eventpoll.c:883 ep_remove_safe+0x1b/0x40 fs/eventpoll.c:894 do_epoll_ctl+0x71a/0xe80 fs/eventpoll.c:2421 __do_sys_epoll_ctl fs/eventpoll.c:2462 [inline] __se_sys_epoll_ctl fs/eventpoll.c:2453 [inline] __x64_sys_epoll_ctl+0x163/0x1a0 fs/eventpoll.c:2453 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88803336e180 which belongs to the cache eventpoll_epi of size 120 The buggy address is located 8 bytes to the right of allocated 120-byte region [ffff88803336e180, ffff88803336e1f8) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88803336ed80 pfn:0x3336e anon flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88802028eb40 0000000000000000 0000000000000001 raw: ffff88803336ed80 0000000000150000 00000000f5000000 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 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5201, tgid 5201 (udevd), ts 40497193493, free_ts 40391951146 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1710 prep_new_page mm/page_alloc.c:1718 [inline] get_page_from_freelist+0x21d1/0x22b0 mm/page_alloc.c:3680 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4970 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2301 alloc_slab_page mm/slub.c:2450 [inline] allocate_slab+0x8a/0x3b0 mm/slub.c:2618 new_slab mm/slub.c:2672 [inline] ___slab_alloc+0xbfc/0x1480 mm/slub.c:3858 __slab_alloc mm/slub.c:3948 [inline] __slab_alloc_node mm/slub.c:4023 [inline] slab_alloc_node mm/slub.c:4184 [inline] kmem_cache_alloc_noprof+0x283/0x3c0 mm/slub.c:4203 ep_insert+0x272/0x1a00 fs/eventpoll.c:1671 do_epoll_ctl+0x7f2/0xe80 fs/eventpoll.c:2411 __do_sys_epoll_ctl fs/eventpoll.c:2462 [inline] __se_sys_epoll_ctl fs/eventpoll.c:2453 [inline] __x64_sys_epoll_ctl+0x163/0x1a0 fs/eventpoll.c:2453 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 5190 tgid 5190 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1254 [inline] __free_frozen_pages+0xc65/0xe50 mm/page_alloc.c:2717 discard_slab mm/slub.c:2716 [inline] __put_partials+0x161/0x1c0 mm/slub.c:3185 put_cpu_partial+0x17c/0x250 mm/slub.c:3260 __slab_free+0x2f7/0x400 mm/slub.c:4512 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4147 [inline] slab_alloc_node mm/slub.c:4196 [inline] kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4203 getname_flags+0xb8/0x540 fs/namei.c:146 getname include/linux/fs.h:2879 [inline] do_sys_openat2+0xbc/0x1c0 fs/open.c:1431 do_sys_open fs/open.c:1452 [inline] __do_sys_openat fs/open.c:1468 [inline] __se_sys_openat fs/open.c:1463 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1463 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88803336e100: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc ffff88803336e180: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc >ffff88803336e200: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ^ ffff88803336e280: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc ffff88803336e300: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc ==================================================================