================================================================== 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+0x70/0x49c fs/buffer.c:2796 Read of size 4 at addr ffff0000f3060c60 by task syz.3.1647/14737 CPU: 0 PID: 14737 Comm: syz.3.1647 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026 Call trace: dump_backtrace+0x1c0/0x1ec 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+0xf4/0x15c 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+0xa8/0xfc mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x258/0x290 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+0x70/0x49c fs/buffer.c:2796 try_to_free_buffers+0x1a0/0x2b0 fs/buffer.c:2830 filemap_release_folio+0x1ec/0x248 mm/filemap.c:4027 shrink_folio_list+0x1a54/0x44e8 mm/vmscan.c:2003 evict_folios+0x38bc/0x49b0 mm/vmscan.c:5046 lru_gen_shrink_lruvec mm/vmscan.c:5229 [inline] shrink_lruvec+0x9e0/0x32d4 mm/vmscan.c:5924 shrink_node_memcgs mm/vmscan.c:6145 [inline] shrink_node+0x534/0x2074 mm/vmscan.c:6176 shrink_zones mm/vmscan.c:6417 [inline] do_try_to_free_pages+0x558/0x1450 mm/vmscan.c:6479 try_to_free_mem_cgroup_pages+0x2f4/0xa68 mm/vmscan.c:6794 try_charge_memcg+0x434/0x143c mm/memcontrol.c:2684 try_charge mm/memcontrol.c:2826 [inline] charge_memcg+0xa4/0x1f0 mm/memcontrol.c:6923 __mem_cgroup_charge+0x38/0xb0 mm/memcontrol.c:6944 mem_cgroup_charge include/linux/memcontrol.h:672 [inline] shmem_add_to_page_cache+0x674/0xf34 mm/shmem.c:708 shmem_get_folio_gfp+0xe64/0x2030 mm/shmem.c:1971 shmem_fault+0x170/0x55c mm/shmem.c:2156 __do_fault+0x11c/0x3d8 mm/memory.c:4278 do_read_fault mm/memory.c:4629 [inline] do_fault mm/memory.c:4758 [inline] handle_pte_fault mm/memory.c:5029 [inline] __handle_mm_fault mm/memory.c:5171 [inline] handle_mm_fault+0x1cac/0x2fb0 mm/memory.c:5292 faultin_page mm/gup.c:1026 [inline] __get_user_pages+0x33c/0x754 mm/gup.c:1250 populate_vma_page_range+0x1f4/0x298 mm/gup.c:1607 __mm_populate+0x210/0x334 mm/gup.c:1721 mm_populate include/linux/mm.h:2891 [inline] vm_mmap_pgoff+0x1d8/0x294 mm/util.c:525 ksys_mmap_pgoff+0xd0/0x5a0 mm/mmap.c:1482 __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline] __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline] __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 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 7659: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:53 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:384 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+0x1c4/0x47c fs/iomap/buffered-io.c:61 iomap_readpage_iter+0x1d8/0x820 fs/iomap/buffered-io.c:273 iomap_read_folio+0x2c0/0x68c fs/iomap/buffered-io.c:344 erofs_read_folio+0x100/0x310 fs/erofs/data.c:359 filemap_read_folio+0x134/0x384 mm/filemap.c:2490 do_read_cache_folio+0x24c/0x538 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+0x218/0xc48 fs/erofs/namei.c:175 erofs_lookup+0x158/0x44c fs/erofs/namei.c:204 __lookup_slow+0x25c/0x38c fs/namei.c:1698 lookup_slow+0x5c/0x80 fs/namei.c:1715 walk_component fs/namei.c:2006 [inline] link_path_walk+0x794/0xcc0 fs/namei.c:2333 path_openat+0x1cc/0x26bc fs/namei.c:3787 do_filp_open+0x194/0x384 fs/namei.c:3818 do_sys_openat2+0x134/0x3f4 fs/open.c:1320 do_sys_open fs/open.c:1336 [inline] __do_sys_openat fs/open.c:1352 [inline] __se_sys_openat fs/open.c:1347 [inline] __arm64_sys_openat+0x118/0x14c fs/open.c:1347 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 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 ffff0000f3060c00 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 96 bytes inside of 128-byte region [ffff0000f3060c00, ffff0000f3060c80) The buggy address belongs to the physical page: page:00000000c655fe9a refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000f3060000 pfn:0x133060 flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000200 fffffc0003d6a808 fffffc00044f1e48 ffff0000c0002300 raw: ffff0000f3060000 000000000010000e 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f3060b00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f3060b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000f3060c00: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ^ ffff0000f3060c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000f3060d00: 00 00 fc fc 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: 14737 Comm: syz.3.1647 Tainted: G B syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026 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/0x49c 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+0x70/0x49c fs/buffer.c:2796 sp : ffff800022285f90 x29: ffff800022285fc0 x28: ffff0000f3060c00 x27: dfff800000000000 x26: 1fffff800087b3c9 x25: 1fffff800087b3c8 x24: 1fffff800087b3c9 x23: dead4ead00000000 x22: dfff800000000000 x21: fffffc00043d9e40 x20: dead4ead00000060 x19: 0000000000000000 x18: ffff800011b9bf60 x17: 1fffe00033ea637e x16: ffff80000804309c x15: 0000000040000000 x14: 0000000000000001 x13: 1ffff00002fc1b6c x12: 0000000000080000 x11: 000000000007ffff x10: ffff8000260e9000 x9 : 0000000000000003 x8 : 1bd5a9d5a000000c x7 : 0000000000000004 x6 : ffff800008257984 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff800008a9a0f4 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/0x49c fs/buffer.c:2796 try_to_free_buffers+0x1a0/0x2b0 fs/buffer.c:2830 filemap_release_folio+0x1ec/0x248 mm/filemap.c:4027 shrink_folio_list+0x1a54/0x44e8 mm/vmscan.c:2003 evict_folios+0x38bc/0x49b0 mm/vmscan.c:5046 lru_gen_shrink_lruvec mm/vmscan.c:5229 [inline] shrink_lruvec+0x9e0/0x32d4 mm/vmscan.c:5924 shrink_node_memcgs mm/vmscan.c:6145 [inline] shrink_node+0x534/0x2074 mm/vmscan.c:6176 shrink_zones mm/vmscan.c:6417 [inline] do_try_to_free_pages+0x558/0x1450 mm/vmscan.c:6479 try_to_free_mem_cgroup_pages+0x2f4/0xa68 mm/vmscan.c:6794 try_charge_memcg+0x434/0x143c mm/memcontrol.c:2684 try_charge mm/memcontrol.c:2826 [inline] charge_memcg+0xa4/0x1f0 mm/memcontrol.c:6923 __mem_cgroup_charge+0x38/0xb0 mm/memcontrol.c:6944 mem_cgroup_charge include/linux/memcontrol.h:672 [inline] shmem_add_to_page_cache+0x674/0xf34 mm/shmem.c:708 shmem_get_folio_gfp+0xe64/0x2030 mm/shmem.c:1971 shmem_fault+0x170/0x55c mm/shmem.c:2156 __do_fault+0x11c/0x3d8 mm/memory.c:4278 do_read_fault mm/memory.c:4629 [inline] do_fault mm/memory.c:4758 [inline] handle_pte_fault mm/memory.c:5029 [inline] __handle_mm_fault mm/memory.c:5171 [inline] handle_mm_fault+0x1cac/0x2fb0 mm/memory.c:5292 faultin_page mm/gup.c:1026 [inline] __get_user_pages+0x33c/0x754 mm/gup.c:1250 populate_vma_page_range+0x1f4/0x298 mm/gup.c:1607 __mm_populate+0x210/0x334 mm/gup.c:1721 mm_populate include/linux/mm.h:2891 [inline] vm_mmap_pgoff+0x1d8/0x294 mm/util.c:525 ksys_mmap_pgoff+0xd0/0x5a0 mm/mmap.c:1482 __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline] __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline] __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 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: 97f935b3 d343fe88 12000a89 11000d29 (38fb6908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 97f935b3 bl 0xffffffffffe4d6cc 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