ext4 filesystem being mounted at /86/mnt supports timestamps until 2038-01-19 (0x7fffffff) ================================================================== BUG: KASAN: use-after-free in cleancache_fs_enabled_mapping include/linux/cleancache.h:56 [inline] BUG: KASAN: use-after-free in cleancache_invalidate_page include/linux/cleancache.h:110 [inline] BUG: KASAN: use-after-free in unaccount_page_cache_page+0x6d8/0x750 mm/filemap.c:167 Read of size 4 at addr ffff8881301b2470 by task syz.0.448/2303 CPU: 0 PID: 2303 Comm: syz.0.448 Not tainted 5.15.178-syzkaller-00034-g5e1b899f19c3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1c0 lib/dump_stack.c:106 print_address_description+0x87/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:444 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308 cleancache_fs_enabled_mapping include/linux/cleancache.h:56 [inline] cleancache_invalidate_page include/linux/cleancache.h:110 [inline] unaccount_page_cache_page+0x6d8/0x750 mm/filemap.c:167 __delete_from_page_cache+0xc6/0x5b0 mm/filemap.c:235 __remove_mapping+0x566/0x690 mm/vmscan.c:1208 shrink_page_list+0x2723/0x5c50 mm/vmscan.c:1805 shrink_inactive_list mm/vmscan.c:2312 [inline] shrink_list mm/vmscan.c:2557 [inline] shrink_lruvec+0x17ec/0x4580 mm/vmscan.c:5762 shrink_node_memcgs mm/vmscan.c:5954 [inline] shrink_node+0x1083/0x2550 mm/vmscan.c:5984 shrink_zones mm/vmscan.c:6190 [inline] do_try_to_free_pages+0x5c6/0x1600 mm/vmscan.c:6248 try_to_free_pages+0x3a5/0xd70 mm/vmscan.c:6483 __perform_reclaim mm/page_alloc.c:4949 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4972 [inline] __alloc_pages_slowpath+0x15fe/0x38e0 mm/page_alloc.c:5396 __alloc_pages+0x503/0x8f0 mm/page_alloc.c:5793 __alloc_pages_node include/linux/gfp.h:591 [inline] alloc_pages_node include/linux/gfp.h:605 [inline] alloc_pages include/linux/gfp.h:618 [inline] __get_free_pages+0x10/0x30 mm/page_alloc.c:5817 io_mem_alloc io_uring/io_uring.c:8875 [inline] io_allocate_scq_urings io_uring/io_uring.c:10296 [inline] io_uring_create io_uring/io_uring.c:10412 [inline] io_uring_setup io_uring/io_uring.c:10502 [inline] __do_sys_io_uring_setup io_uring/io_uring.c:10508 [inline] __se_sys_io_uring_setup+0x1273/0x3660 io_uring/io_uring.c:10505 __x64_sys_io_uring_setup+0x5b/0x70 io_uring/io_uring.c:10505 x64_sys_call+0x8ef/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:426 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7feaf6e08169 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:00007feaf5471fc8 EFLAGS: 00000202 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 00007feaf7020fa0 RCX: 00007feaf6e08169 RDX: 00002000000001c0 RSI: 0000200000000100 RDI: 000000000000275a RBP: 0000200000000100 R08: 0000000000000000 R09: 00002000000001c0 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 R13: 0000000000000000 R14: 000000000000275a R15: 00002000000001c0 Allocated by task 1958: 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:433 [inline] ____kasan_kmalloc+0xdb/0x110 mm/kasan/common.c:512 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:227 [inline] kmem_cache_alloc_trace+0x11a/0x270 mm/slub.c:3269 kmalloc include/linux/slab.h:603 [inline] kzalloc include/linux/slab.h:733 [inline] io_ring_ctx_alloc io_uring/io_uring.c:1296 [inline] io_uring_create io_uring/io_uring.c:10396 [inline] io_uring_setup io_uring/io_uring.c:10502 [inline] __do_sys_io_uring_setup io_uring/io_uring.c:10508 [inline] __se_sys_io_uring_setup+0x393/0x3660 io_uring/io_uring.c:10505 __x64_sys_io_uring_setup+0x5b/0x70 io_uring/io_uring.c:10505 x64_sys_call+0x8ef/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:426 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 2010: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x126/0x160 mm/kasan/common.c:365 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:193 [inline] slab_free_hook mm/slub.c:1723 [inline] slab_free_freelist_hook+0xbd/0x190 mm/slub.c:1749 slab_free mm/slub.c:3521 [inline] kfree+0xcc/0x270 mm/slub.c:4583 io_ring_ctx_free io_uring/io_uring.c:9422 [inline] io_ring_exit_work+0x158c/0x16c0 io_uring/io_uring.c:9577 process_one_work+0x6bb/0xc10 kernel/workqueue.c:2325 worker_thread+0xad5/0x12a0 kernel/workqueue.c:2472 kthread+0x421/0x510 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0xf0 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 insert_work+0x56/0x320 kernel/workqueue.c:1373 __queue_work+0x92a/0xcd0 kernel/workqueue.c:1539 queue_work_on+0x105/0x170 kernel/workqueue.c:1566 queue_work include/linux/workqueue.h:510 [inline] io_ring_ctx_wait_and_kill+0x307/0x360 io_uring/io_uring.c:9634 io_uring_create io_uring/io_uring.c:10475 [inline] io_uring_setup io_uring/io_uring.c:10502 [inline] __do_sys_io_uring_setup io_uring/io_uring.c:10508 [inline] __se_sys_io_uring_setup+0x19c8/0x3660 io_uring/io_uring.c:10505 __x64_sys_io_uring_setup+0x5b/0x70 io_uring/io_uring.c:10505 x64_sys_call+0x8ef/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:426 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0xf0 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 insert_work+0x56/0x320 kernel/workqueue.c:1373 __queue_work+0x92a/0xcd0 kernel/workqueue.c:1539 queue_work_on+0x105/0x170 kernel/workqueue.c:1566 queue_work include/linux/workqueue.h:510 [inline] schedule_work include/linux/workqueue.h:571 [inline] destroy_super_rcu+0xd1/0xe0 fs/super.c:172 rcu_do_batch+0x57a/0xc10 kernel/rcu/tree.c:2523 rcu_core+0x517/0x1020 kernel/rcu/tree.c:2763 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2776 handle_softirqs+0x25e/0x5c0 kernel/softirq.c:565 run_ksoftirqd+0x28/0x40 kernel/softirq.c:941 smpboot_thread_fn+0x466/0x8d0 kernel/smpboot.c:164 kthread+0x421/0x510 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 The buggy address belongs to the object at ffff8881301b2000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1136 bytes inside of 2048-byte region [ffff8881301b2000, ffff8881301b2800) The buggy address belongs to the page: page:ffffea0004c06c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1301b0 head:ffffea0004c06c00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 0000000100000001 ffff888100043200 raw: 0000000000000000 0000000000080008 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 505, ts 35592850475, free_ts 29343220660 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2605 prep_new_page+0x1b/0x110 mm/page_alloc.c:2611 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4485 __alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5780 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1932 [inline] new_slab+0x9a/0x4e0 mm/slub.c:1995 ___slab_alloc+0x39e/0x830 mm/slub.c:3028 __slab_alloc+0x4a/0x90 mm/slub.c:3115 slab_alloc_node mm/slub.c:3206 [inline] slab_alloc mm/slub.c:3250 [inline] kmem_cache_alloc_trace+0x147/0x270 mm/slub.c:3267 kmalloc include/linux/slab.h:603 [inline] kzalloc include/linux/slab.h:733 [inline] io_ring_ctx_alloc io_uring/io_uring.c:1296 [inline] io_uring_create io_uring/io_uring.c:10396 [inline] io_uring_setup io_uring/io_uring.c:10502 [inline] __do_sys_io_uring_setup io_uring/io_uring.c:10508 [inline] __se_sys_io_uring_setup+0x393/0x3660 io_uring/io_uring.c:10505 __x64_sys_io_uring_setup+0x5b/0x70 io_uring/io_uring.c:10505 x64_sys_call+0x8ef/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:426 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1472 [inline] free_pcp_prepare mm/page_alloc.c:1544 [inline] free_unref_page_prepare+0x7c8/0x7d0 mm/page_alloc.c:3534 free_unref_page+0xe8/0x750 mm/page_alloc.c:3616 free_the_page mm/page_alloc.c:805 [inline] free_compound_page+0x78/0xa0 mm/page_alloc.c:828 io_mem_free io_uring/io_uring.c:8868 [inline] io_ring_ctx_free io_uring/io_uring.c:9413 [inline] io_ring_exit_work+0x104d/0x16c0 io_uring/io_uring.c:9577 process_one_work+0x6bb/0xc10 kernel/workqueue.c:2325 worker_thread+0xad5/0x12a0 kernel/workqueue.c:2472 kthread+0x421/0x510 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Memory state around the buggy address: ffff8881301b2300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881301b2380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881301b2400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881301b2480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881301b2500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== syz.0.448 (2303) used greatest stack depth: 15616 bytes left