EXT4-fs (loop2): stripe (1570) is not aligned with cluster size (16), stripe is disabled EXT4-fs (loop2): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ================================================================== BUG: KASAN: slab-out-of-bounds in ext4_ext_correct_indexes+0x72/0x5b0 fs/ext4/extents.c:1710 Read of size 8 at addr ffff888143f0f250 by task syz.2.114/6986 CPU: 1 UID: 0 PID: 6986 Comm: syz.2.114 Not tainted 6.15.0-rc7-syzkaller-00152-gd0c22de9995b #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+0xb4/0x290 mm/kasan/report.c:521 kasan_report+0x118/0x150 mm/kasan/report.c:634 ext4_ext_correct_indexes+0x72/0x5b0 fs/ext4/extents.c:1710 ext4_ext_insert_extent+0x1fdd/0x4af0 fs/ext4/extents.c:2186 ext4_ext_map_blocks+0x179c/0x67c0 fs/ext4/extents.c:4400 ext4_map_create_blocks fs/ext4/inode.c:520 [inline] ext4_map_blocks+0x807/0x1740 fs/ext4/inode.c:706 _ext4_get_block+0x200/0x4c0 fs/ext4/inode.c:785 ext4_get_block_unwritten+0x2e/0x100 fs/ext4/inode.c:818 ext4_block_write_begin+0x543/0x1290 fs/ext4/inode.c:1067 ext4_write_begin+0x6f6/0x12c0 fs/ext4/ext4_jbd2.h:-1 ext4_da_write_begin+0x33a/0xa60 fs/ext4/inode.c:2932 generic_perform_write+0x2c4/0x910 mm/filemap.c:4103 ext4_buffered_write_iter+0xce/0x3a0 fs/ext4/file.c:299 ext4_file_write_iter+0x298/0x1bc0 fs/ext4/file.c:-1 new_sync_write fs/read_write.c:591 [inline] vfs_write+0x54b/0xa90 fs/read_write.c:684 ksys_pwrite64 fs/read_write.c:791 [inline] __do_sys_pwrite64 fs/read_write.c:799 [inline] __se_sys_pwrite64 fs/read_write.c:796 [inline] __x64_sys_pwrite64+0x193/0x220 fs/read_write.c:796 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4c0e38e969 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:00007f4c0f2a1038 EFLAGS: 00000246 ORIG_RAX: 0000000000000012 RAX: ffffffffffffffda RBX: 00007f4c0e5b5fa0 RCX: 00007f4c0e38e969 RDX: 000000000000fdef RSI: 0000200000000140 RDI: 0000000000000004 RBP: 00007f4c0e410ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000fecc R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f4c0e5b5fa0 R15: 00007fff49539258 Allocated by task 1: 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 __proc_create+0x384/0x8f0 fs/proc/generic.c:427 proc_create_reg fs/proc/generic.c:554 [inline] proc_create_single_data+0xa5/0x1e0 fs/proc/generic.c:661 register_irq_proc+0x1fc/0x370 kernel/irq/proc.c:373 __setup_irq+0x157d/0x2070 kernel/irq/manage.c:1828 request_threaded_irq+0x2c1/0x3a0 kernel/irq/manage.c:2203 request_irq include/linux/interrupt.h:172 [inline] vp_find_one_vq_msix+0x247/0x490 drivers/virtio/virtio_pci_common.c:365 vp_find_vqs_msix+0x9b0/0xd00 drivers/virtio/virtio_pci_common.c:429 vp_find_vqs+0x9c/0x760 drivers/virtio/virtio_pci_common.c:525 virtio_find_vqs include/linux/virtio_config.h:226 [inline] virtnet_find_vqs drivers/net/virtio_net.c:6435 [inline] init_vqs+0xbd7/0x12d0 drivers/net/virtio_net.c:6520 virtnet_probe+0x1e35/0x4270 drivers/net/virtio_net.c:6907 virtio_dev_probe+0x917/0xbe0 drivers/virtio/virtio.c:341 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x26d/0x9a0 drivers/base/dd.c:657 __driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:799 driver_probe_device+0x4f/0x430 drivers/base/dd.c:829 __driver_attach+0x452/0x700 drivers/base/dd.c:1215 bus_for_each_dev+0x233/0x2b0 drivers/base/bus.c:370 bus_add_driver+0x345/0x640 drivers/base/bus.c:678 driver_register+0x23a/0x320 drivers/base/driver.c:249 virtio_net_driver_init+0x96/0xe0 drivers/net/virtio_net.c:7211 do_one_initcall+0x233/0x820 init/main.c:1257 do_initcall_level+0x137/0x1f0 init/main.c:1319 do_initcalls+0x69/0xd0 init/main.c:1335 kernel_init_freeable+0x3d9/0x570 init/main.c:1567 kernel_init+0x1d/0x1d0 init/main.c:1457 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the object at ffff888143f0f140 which belongs to the cache proc_dir_entry of size 256 The buggy address is located 16 bytes to the right of allocated 256-byte region [ffff888143f0f140, ffff888143f0f240) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x143f0f flags: 0x57ff00000000000(node=1|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 057ff00000000000 ffff888140ad4a00 dead000000000122 0000000000000000 raw: 0000000000000000 00000000000c000c 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 1, tgid 1 (swapper/0), ts 13163196652, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1d8/0x230 mm/page_alloc.c:1714 prep_new_page mm/page_alloc.c:1722 [inline] get_page_from_freelist+0x21c7/0x22a0 mm/page_alloc.c:3684 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4966 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 __proc_create+0x384/0x8f0 fs/proc/generic.c:427 proc_create_reg fs/proc/generic.c:554 [inline] proc_create_data+0xa3/0x2d0 fs/proc/generic.c:580 register_irq_proc+0x1ca/0x370 kernel/irq/proc.c:369 __setup_irq+0x157d/0x2070 kernel/irq/manage.c:1828 request_threaded_irq+0x2c1/0x3a0 kernel/irq/manage.c:2203 request_irq include/linux/interrupt.h:172 [inline] vp_find_one_vq_msix+0x247/0x490 drivers/virtio/virtio_pci_common.c:365 vp_find_vqs_msix+0x9b0/0xd00 drivers/virtio/virtio_pci_common.c:429 vp_find_vqs+0x9c/0x760 drivers/virtio/virtio_pci_common.c:525 virtio_find_vqs include/linux/virtio_config.h:226 [inline] virtnet_find_vqs drivers/net/virtio_net.c:6435 [inline] init_vqs+0xbd7/0x12d0 drivers/net/virtio_net.c:6520 page_owner free stack trace missing Memory state around the buggy address: ffff888143f0f100: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ffff888143f0f180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888143f0f200: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff888143f0f280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888143f0f300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================