================================================================== BUG: KASAN: slab-out-of-bounds in __bfs+0x154/0x394 kernel/locking/lockdep.c:1708 Read of size 8 at addr ffffaf800e193ff0 by task sshd/2021 CPU: 0 PID: 2021 Comm: sshd Not tainted 5.17.0-rc1-syzkaller-00002-g0966d385830d #0 Hardware name: riscv-virtio,qemu (DT) Call Trace: [] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:113 [] show_stack+0x34/0x40 arch/riscv/kernel/stacktrace.c:119 [] __dump_stack lib/dump_stack.c:88 [inline] [] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:106 [] print_address_description.constprop.0+0x2a/0x330 mm/kasan/report.c:255 [] __kasan_report mm/kasan/report.c:442 [inline] [] kasan_report+0x184/0x1e0 mm/kasan/report.c:459 [] check_region_inline mm/kasan/generic.c:183 [inline] [] __asan_load8+0x6e/0x96 mm/kasan/generic.c:256 [] __bfs+0x154/0x394 kernel/locking/lockdep.c:1708 [] __bfs_forwards kernel/locking/lockdep.c:1803 [inline] [] check_path.constprop.0+0x24/0x46 kernel/locking/lockdep.c:2104 [] check_noncircular+0x11a/0x1fe kernel/locking/lockdep.c:2131 Allocated by task 1839: stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122 kasan_save_stack+0x2c/0x58 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0x80/0xb2 mm/kasan/common.c:524 kasan_kmalloc include/linux/kasan.h:270 [inline] __kmalloc+0x190/0x318 mm/slub.c:4424 kmalloc include/linux/slab.h:586 [inline] load_elf_phdrs+0x100/0x1e8 fs/binfmt_elf.c:480 load_elf_binary+0xbe2/0x2716 fs/binfmt_elf.c:960 search_binary_handler fs/exec.c:1727 [inline] exec_binprm fs/exec.c:1768 [inline] bprm_execve fs/exec.c:1837 [inline] bprm_execve+0x5bc/0x1140 fs/exec.c:1799 do_execveat_common+0x298/0x312 fs/exec.c:1926 do_execve fs/exec.c:1994 [inline] __do_sys_execve fs/exec.c:2070 [inline] sys_execve+0x32/0x40 fs/exec.c:2065 ret_from_syscall+0x0/0x2 Last potentially related work creation: ------------[ cut here ]------------ slab index 4095 out of bounds (256) for stack id 00000fff WARNING: CPU: 0 PID: 2021 at lib/stackdepot.c:304 stack_depot_fetch lib/stackdepot.c:304 [inline] WARNING: CPU: 0 PID: 2021 at lib/stackdepot.c:304 stack_depot_print+0x66/0x70 lib/stackdepot.c:276 Modules linked in: CPU: 0 PID: 2021 Comm: sshd Not tainted 5.17.0-rc1-syzkaller-00002-g0966d385830d #0 Hardware name: riscv-virtio,qemu (DT) epc : stack_depot_fetch lib/stackdepot.c:304 [inline] epc : stack_depot_print+0x66/0x70 lib/stackdepot.c:276 ra : stack_depot_fetch lib/stackdepot.c:304 [inline] ra : stack_depot_print+0x66/0x70 lib/stackdepot.c:276 epc : ffffffff80c00b8a ra : ffffffff80c00b8a sp : ffffaf800e193d80 gp : ffffffff85863ac0 tp : ffffaf8009df9840 t0 : ffffffff86bcb657 t1 : fffff5ef0b53910c t2 : 0000000000000000 s0 : ffffaf800e193d90 s1 : ffffaf807aa40080 a0 : 0000000000000039 a1 : 00000000000f0000 a2 : 0000000000000506 a3 : ffffffff8012252a a4 : 2915ea31eee56300 a5 : 2915ea31eee56300 a6 : 0000000000f00000 a7 : ffffaf805a9c8863 s2 : ffffaf800e193ff0 s3 : ffffaf8007201c80 s4 : ffffaf800e193c00 s5 : ffffaf800e193e00 s6 : ffffffff8588bb20 s7 : ffffffff85e09180 s8 : ffffaf800e193f00 s9 : ffffaf8009dfa3e8 s10: ffffffff85899680 s11: ffffaf8009df9840 t3 : ffffffff801163b2 t4 : fffff5ef0b53910c t5 : fffff5ef0b53910d t6 : ffffaf800e193878 status: 0000000000000100 badaddr: 0000000000000000 cause: 0000000000000003 [] describe_object_stacks mm/kasan/report.c:216 [inline] [] describe_object mm/kasan/report.c:231 [inline] [] print_address_description.constprop.0+0x2fc/0x330 mm/kasan/report.c:263 [] __kasan_report mm/kasan/report.c:442 [inline] [] kasan_report+0x184/0x1e0 mm/kasan/report.c:459 [] check_region_inline mm/kasan/generic.c:183 [inline] [] __asan_load8+0x6e/0x96 mm/kasan/generic.c:256 [] __bfs+0x154/0x394 kernel/locking/lockdep.c:1708 [] __bfs_forwards kernel/locking/lockdep.c:1803 [inline] [] check_path.constprop.0+0x24/0x46 kernel/locking/lockdep.c:2104 [] check_noncircular+0x11a/0x1fe kernel/locking/lockdep.c:2131 irq event stamp: 135089 hardirqs last enabled at (135088): [] rmqueue_pcplist mm/page_alloc.c:3671 [inline] hardirqs last enabled at (135088): [] rmqueue mm/page_alloc.c:3698 [inline] hardirqs last enabled at (135088): [] get_page_from_freelist+0xfc8/0x12d8 mm/page_alloc.c:4162 hardirqs last disabled at (135089): [] rmqueue_pcplist mm/page_alloc.c:3660 [inline] hardirqs last disabled at (135089): [] rmqueue mm/page_alloc.c:3698 [inline] hardirqs last disabled at (135089): [] get_page_from_freelist+0xfbe/0x12d8 mm/page_alloc.c:4162 softirqs last enabled at (134096): [] spin_unlock_bh include/linux/spinlock.h:394 [inline] softirqs last enabled at (134096): [] release_sock+0xf6/0x122 net/core/sock.c:3322 softirqs last disabled at (134137): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (134137): [] invoke_softirq kernel/softirq.c:439 [inline] softirqs last disabled at (134137): [] __irq_exit_rcu+0x142/0x1f8 kernel/softirq.c:637 ---[ end trace 0000000000000000 ]--- The buggy address belongs to the object at ffffaf800e193c00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 496 bytes to the right of 512-byte region [ffffaf800e193c00, ffffaf800e193e00) The buggy address belongs to the page: page:ffffaf807aa40080 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffffaf800e190000 pfn:0x8e390 head:ffffaf807aa40080 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x8800010200(slab|head|section=17|node=0|zone=0) raw: 0000008800010200 ffffaf807a9d6908 ffffaf807a9cbaa8 ffffaf8007201c80 raw: ffffaf800e190000 000000000010000a 00000001ffffffff 0000000000000000 raw: 00000000000007ff page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, ts 50188607100, free_ts 50162170300 __set_page_owner+0x48/0x136 mm/page_owner.c:183 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0xd0/0x10a mm/page_alloc.c:2427 prep_new_page mm/page_alloc.c:2434 [inline] get_page_from_freelist+0x8da/0x12d8 mm/page_alloc.c:4165 __alloc_pages+0x150/0x3b6 mm/page_alloc.c:5389 alloc_page_interleave+0x2a/0x1cc mm/mempolicy.c:2116 alloc_pages+0x210/0x2a6 mm/mempolicy.c:2266 alloc_slab_page.constprop.0+0xc2/0xfa mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x25a/0x2cc mm/slub.c:2004 ___slab_alloc+0x56e/0x918 mm/slub.c:3018 __slab_alloc.constprop.0+0x50/0x8c mm/slub.c:3105 slab_alloc_node mm/slub.c:3196 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc_trace+0x2a2/0x2e0 mm/slub.c:3255 kmalloc include/linux/slab.h:581 [inline] kzalloc include/linux/slab.h:715 [inline] find_valid_gpt.constprop.0+0x1aa/0x15f4 block/partitions/efi.c:599 efi_partition+0x100/0x70a block/partitions/efi.c:720 check_partition block/partitions/core.c:148 [inline] blk_add_partitions block/partitions/core.c:609 [inline] bdev_disk_changed+0x352/0xb34 block/partitions/core.c:695 blkdev_get_whole+0x168/0x17a block/bdev.c:679 blkdev_get_by_dev.part.0+0x346/0x636 block/bdev.c:813 page last free stack trace: __reset_page_owner+0x4a/0xea mm/page_owner.c:142 reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1352 [inline] free_pcp_prepare+0x29c/0x45e mm/page_alloc.c:1404 free_unref_page_prepare mm/page_alloc.c:3325 [inline] free_unref_page+0x6a/0x31e mm/page_alloc.c:3404 free_the_page mm/page_alloc.c:706 [inline] __free_pages+0xe2/0x112 mm/page_alloc.c:5474 free_pages.part.0+0xe0/0xf6 mm/page_alloc.c:5485 free_pages+0xe/0x18 mm/page_alloc.c:5482 __stack_depot_save+0x1b4/0x4b2 lib/stackdepot.c:427 kasan_save_stack+0x40/0x58 mm/kasan/common.c:39 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] __kasan_slab_alloc+0x8e/0x98 mm/kasan/common.c:469 kasan_slab_alloc include/linux/kasan.h:260 [inline] slab_post_alloc_hook mm/slab.h:732 [inline] slab_alloc_node mm/slub.c:3230 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc+0x144/0x3de mm/slub.c:3243 alloc_inode+0xf4/0x134 fs/inode.c:262 new_inode_pseudo fs/inode.c:1018 [inline] new_inode+0x28/0x140 fs/inode.c:1047 debugfs_get_inode+0x20/0xb0 fs/debugfs/inode.c:72 debugfs_create_dir+0xc0/0x302 fs/debugfs/inode.c:568 blk_mq_debugfs_register_rqos+0x132/0x1c8 block/blk-mq-debugfs.c:856 rq_qos_add block/blk-rq-qos.h:108 [inline] wbt_init+0x224/0x354 block/blk-wbt.c:849 Memory state around the buggy address: ffffaf800e193e80: fc fc fc fc f1 f1 f1 f1 00 f3 f3 f3 fc fc fc fc ffffaf800e193f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffffaf800e193f80: 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 fc fc fc fc ^ ffffaf800e194000: 00 00 00 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00 ffffaf800e194080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================