================================================================== BUG: KASAN: slab-out-of-bounds in instrument_atomic_read include/linux/instrumented.h:72 [inline] BUG: KASAN: slab-out-of-bounds in atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] BUG: KASAN: slab-out-of-bounds in buffer_busy fs/buffer.c:2784 [inline] BUG: KASAN: slab-out-of-bounds in drop_buffers+0x70/0x4a8 fs/buffer.c:2796 Read of size 4 at addr ffff0000f6b96260 by task syz.1.151/5230 CPU: 0 PID: 5230 Comm: syz.1.151 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 print_address_description+0x88/0x218 mm/kasan/report.c:316 print_report+0x50/0x68 mm/kasan/report.c:420 kasan_report+0xa8/0x100 mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x260/0x2a0 mm/kasan/generic.c:189 __kasan_check_read+0x2c/0x3c mm/kasan/shadow.c:31 instrument_atomic_read include/linux/instrumented.h:72 [inline] atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] buffer_busy fs/buffer.c:2784 [inline] drop_buffers+0x70/0x4a8 fs/buffer.c:2796 try_to_free_buffers+0x180/0x280 fs/buffer.c:2826 filemap_release_folio+0x1ec/0x248 mm/filemap.c:4027 shrink_folio_list+0x19d4/0x4448 mm/vmscan.c:2003 evict_folios+0x3850/0x4964 mm/vmscan.c:5046 lru_gen_shrink_lruvec mm/vmscan.c:5229 [inline] shrink_lruvec+0x958/0x34e4 mm/vmscan.c:5924 shrink_node_memcgs mm/vmscan.c:6145 [inline] shrink_node+0x52c/0x20ac mm/vmscan.c:6176 shrink_zones mm/vmscan.c:6417 [inline] do_try_to_free_pages+0x550/0x144c mm/vmscan.c:6479 try_to_free_mem_cgroup_pages+0x2d8/0xa50 mm/vmscan.c:6794 try_charge_memcg+0x48c/0x1448 mm/memcontrol.c:2684 obj_cgroup_charge_pages mm/memcontrol.c:3099 [inline] __memcg_kmem_charge_page+0x304/0x54c mm/memcontrol.c:3125 __alloc_pages+0x1fc/0x53c mm/page_alloc.c:5631 __alloc_pages_node include/linux/gfp.h:237 [inline] alloc_pages_node include/linux/gfp.h:260 [inline] bpf_ringbuf_area_alloc kernel/bpf/ringbuf.c:132 [inline] bpf_ringbuf_alloc+0x2d4/0x600 kernel/bpf/ringbuf.c:169 ringbuf_map_alloc+0x19c/0x29c kernel/bpf/ringbuf.c:210 find_and_alloc_map kernel/bpf/syscall.c:133 [inline] map_create+0x47c/0xe38 kernel/bpf/syscall.c:1149 __sys_bpf+0x268/0x634 kernel/bpf/syscall.c:5009 __do_sys_bpf kernel/bpf/syscall.c:5131 [inline] __se_sys_bpf kernel/bpf/syscall.c:5129 [inline] __arm64_sys_bpf+0x80/0x98 kernel/bpf/syscall.c:5129 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Allocated by task 4594: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x28/0x34 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc+0xec/0x178 mm/slab_common.c:949 kmalloc include/linux/slab.h:568 [inline] kzalloc include/linux/slab.h:699 [inline] iomap_page_create+0x1c4/0x484 fs/iomap/buffered-io.c:61 iomap_readpage_iter+0x1d8/0x824 fs/iomap/buffered-io.c:273 iomap_read_folio+0x2a0/0x65c fs/iomap/buffered-io.c:344 erofs_read_folio+0x100/0x314 fs/erofs/data.c:359 filemap_read_folio+0x130/0x37c mm/filemap.c:2490 do_read_cache_folio+0x24c/0x544 mm/filemap.c:3659 read_cache_folio+0x68/0x88 mm/filemap.c:3691 erofs_bread+0x13c/0x520 fs/erofs/data.c:50 erofs_find_target_block fs/erofs/namei.c:102 [inline] erofs_namei+0x1fc/0xc00 fs/erofs/namei.c:175 erofs_lookup+0x158/0x450 fs/erofs/namei.c:204 __lookup_slow+0x24c/0x370 fs/namei.c:1698 lookup_slow+0x5c/0x80 fs/namei.c:1715 walk_component+0x270/0x364 fs/namei.c:2006 lookup_last fs/namei.c:2463 [inline] path_lookupat+0x13c/0x3d0 fs/namei.c:2487 filename_lookup+0x190/0x42c fs/namei.c:2516 user_path_at_empty+0x5c/0x84 fs/namei.c:2913 user_path_at include/linux/namei.h:57 [inline] user_statfs+0xa8/0x4f0 fs/statfs.c:103 __do_sys_statfs fs/statfs.c:195 [inline] __se_sys_statfs fs/statfs.c:192 [inline] __arm64_sys_statfs+0xc8/0x148 fs/statfs.c:192 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 The buggy address belongs to the object at ffff0000f6b96200 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 96 bytes inside of 128-byte region [ffff0000f6b96200, ffff0000f6b96280) The buggy address belongs to the physical page: page:000000003b5c9cb5 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x136b96 flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000200 fffffc0003d05c40 dead000000000003 ffff0000c0002300 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f6b96100: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000f6b96180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000f6b96200: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ^ ffff0000f6b96280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000f6b96300: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== Unable to handle kernel paging request at virtual address fbd529d5a000000c KASAN: maybe wild-memory-access in range [0xdead4ead00000060-0xdead4ead00000067] Mem abort info: ESR = 0x0000000096000004 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x04: level 0 translation fault Data abort info: ISV = 0, ISS = 0x00000004 CM = 0, WnR = 0 [fbd529d5a000000c] address between user and kernel address ranges Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 5230 Comm: syz.1.151 Tainted: G B syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : atomic_read include/linux/atomic/atomic-instrumented.h:28 [inline] pc : buffer_busy fs/buffer.c:2784 [inline] pc : drop_buffers+0x7c/0x4a8 fs/buffer.c:2796 lr : instrument_atomic_read include/linux/instrumented.h:72 [inline] lr : atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] lr : buffer_busy fs/buffer.c:2784 [inline] lr : drop_buffers+0x70/0x4a8 fs/buffer.c:2796 sp : ffff800021d665f0 x29: ffff800021d66620 x28: ffff0000f6b96200 x27: dfff800000000000 x26: 1fffff80007ddd39 x25: 1fffff80007ddd38 x24: 1fffff80007ddd39 x23: dead4ead00000000 x22: dfff800000000000 x21: fffffc0003eee9c0 x20: dead4ead00000060 x19: 0000000000000000 x18: ffff800011a5bd40 x17: 1fffe00033ee7b7e x16: ffff800008042d90 x15: 0000000040000000 x14: 0000000000000002 x13: 0000000000ff0100 x12: 0000000000080000 x11: 000000000007ffff x10: ffff800021eb9000 x9 : 0000000000000003 x8 : 1bd5a9d5a000000c x7 : 0000000000000004 x6 : ffff8000082532dc x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff800008a896d8 x2 : 0000000000000000 x1 : 0000000000000004 x0 : 0000000000000001 Call trace: atomic_read include/linux/atomic/atomic-instrumented.h:28 [inline] buffer_busy fs/buffer.c:2784 [inline] drop_buffers+0x7c/0x4a8 fs/buffer.c:2796 try_to_free_buffers+0x180/0x280 fs/buffer.c:2826 filemap_release_folio+0x1ec/0x248 mm/filemap.c:4027 shrink_folio_list+0x19d4/0x4448 mm/vmscan.c:2003 evict_folios+0x3850/0x4964 mm/vmscan.c:5046 lru_gen_shrink_lruvec mm/vmscan.c:5229 [inline] shrink_lruvec+0x958/0x34e4 mm/vmscan.c:5924 shrink_node_memcgs mm/vmscan.c:6145 [inline] shrink_node+0x52c/0x20ac mm/vmscan.c:6176 shrink_zones mm/vmscan.c:6417 [inline] do_try_to_free_pages+0x550/0x144c mm/vmscan.c:6479 try_to_free_mem_cgroup_pages+0x2d8/0xa50 mm/vmscan.c:6794 try_charge_memcg+0x48c/0x1448 mm/memcontrol.c:2684 obj_cgroup_charge_pages mm/memcontrol.c:3099 [inline] __memcg_kmem_charge_page+0x304/0x54c mm/memcontrol.c:3125 __alloc_pages+0x1fc/0x53c mm/page_alloc.c:5631 __alloc_pages_node include/linux/gfp.h:237 [inline] alloc_pages_node include/linux/gfp.h:260 [inline] bpf_ringbuf_area_alloc kernel/bpf/ringbuf.c:132 [inline] bpf_ringbuf_alloc+0x2d4/0x600 kernel/bpf/ringbuf.c:169 ringbuf_map_alloc+0x19c/0x29c kernel/bpf/ringbuf.c:210 find_and_alloc_map kernel/bpf/syscall.c:133 [inline] map_create+0x47c/0xe38 kernel/bpf/syscall.c:1149 __sys_bpf+0x268/0x634 kernel/bpf/syscall.c:5009 __do_sys_bpf kernel/bpf/syscall.c:5131 [inline] __se_sys_bpf kernel/bpf/syscall.c:5129 [inline] __arm64_sys_bpf+0x80/0x98 kernel/bpf/syscall.c:5129 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Code: 97f93e0f d343fe88 12000a89 11000d29 (38fb6908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 97f93e0f bl 0xffffffffffe4f83c 4: d343fe88 lsr x8, x20, #3 8: 12000a89 and w9, w20, #0x7 c: 11000d29 add w9, w9, #0x3 * 10: 38fb6908 ldrsb w8, [x8, x27] <-- trapping instruction