================================================================== BUG: KASAN: stack-out-of-bounds in __get_unaligned_cpu32 include/linux/unaligned/packed_struct.h:19 [inline] BUG: KASAN: stack-out-of-bounds in jhash+0x1b4/0x740 include/linux/jhash.h:81 Read of size 4 at addr ffffc90000106aa0 by task kworker/u8:1/11 CPU: 0 PID: 11 Comm: kworker/u8:1 Not tainted 6.8.0-syzkaller-05243-g14bb1e8c8d4a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Workqueue: writeback wb_workfn (flush-8:0) Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106 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 __get_unaligned_cpu32 include/linux/unaligned/packed_struct.h:19 [inline] jhash+0x1b4/0x740 include/linux/jhash.h:81 hash+0x339/0x410 kernel/bpf/bloom_filter.c:31 bloom_map_peek_elem+0xb2/0x1b0 kernel/bpf/bloom_filter.c:43 bpf_prog_00798911c748094f+0x42/0x46 bpf_dispatcher_nop_func include/linux/bpf.h:1233 [inline] __bpf_prog_run include/linux/filter.h:667 [inline] bpf_prog_run include/linux/filter.h:674 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2396 [inline] bpf_trace_run8+0x3d2/0x610 kernel/trace/bpf_trace.c:2443 __bpf_trace_jbd2_handle_stats+0x47/0x60 include/trace/events/jbd2.h:210 __traceiter_jbd2_handle_stats+0xa3/0x100 include/trace/events/jbd2.h:210 trace_jbd2_handle_stats include/trace/events/jbd2.h:210 [inline] jbd2_journal_stop+0xd3d/0xdc0 fs/jbd2/transaction.c:1869 __ext4_journal_stop+0xfd/0x1a0 fs/ext4/ext4_jbd2.c:134 ext4_do_writepages+0x2d24/0x3ca0 fs/ext4/inode.c:2692 ext4_writepages+0x204/0x3e0 fs/ext4/inode.c:2768 do_writepages+0x3a4/0x670 mm/page-writeback.c:2553 __writeback_single_inode+0x155/0xfd0 fs/fs-writeback.c:1650 writeback_sb_inodes+0x8e4/0x1220 fs/fs-writeback.c:1941 __writeback_inodes_wb+0x11b/0x260 fs/fs-writeback.c:2012 wb_writeback+0x45b/0xc70 fs/fs-writeback.c:2119 wb_check_old_data_flush fs/fs-writeback.c:2223 [inline] wb_do_writeback fs/fs-writeback.c:2276 [inline] wb_workfn+0xb7c/0x1070 fs/fs-writeback.c:2304 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0xa00/0x1770 kernel/workqueue.c:3335 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 The buggy address belongs to stack of task kworker/u8:1/11 and is located at offset 0 in frame: bpf_trace_run8+0x0/0x610 This frame has 2 objects: [32, 48) 'run_ctx.i' [64, 128) 'args' The buggy address belongs to the virtual mapping at [ffffc90000100000, ffffc90000109000) created by: copy_process+0x5d1/0x3df0 kernel/fork.c:2219 The buggy address belongs to the physical page: page:ffffea00005ba000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x16e80 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 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 0x2dc2(GFP_KERNEL|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_ZERO), pid 2, tgid 2 (kthreadd), ts 2693120013, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311 __alloc_pages+0x256/0x680 mm/page_alloc.c:4569 alloc_pages_mpol+0x3de/0x650 mm/mempolicy.c:2133 vm_area_alloc_pages mm/vmalloc.c:3135 [inline] __vmalloc_area_node mm/vmalloc.c:3211 [inline] __vmalloc_node_range+0x9a4/0x14a0 mm/vmalloc.c:3392 alloc_thread_stack_node kernel/fork.c:309 [inline] dup_task_struct+0x3e9/0x7d0 kernel/fork.c:1114 copy_process+0x5d1/0x3df0 kernel/fork.c:2219 kernel_clone+0x21e/0x8d0 kernel/fork.c:2796 kernel_thread+0x1bc/0x240 kernel/fork.c:2858 create_kthread kernel/kthread.c:411 [inline] kthreadd+0x60d/0x810 kernel/kthread.c:764 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 page_owner free stack trace missing Memory state around the buggy address: ffffc90000106980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc90000106a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc90000106a80: 00 00 00 00 f1 f1 f1 f1 00 00 f2 f2 00 00 00 00 ^ ffffc90000106b00: 00 00 00 00 f3 f3 f3 f3 00 00 00 00 00 00 00 00 ffffc90000106b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================