Hello,

syzbot found the following issue on:

HEAD commit: 614cb2751d31 Merge tag 'trace-v5.14-rc6' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=130112c5300000 kernel config: https://syzkaller.appspot.com/x/.config?x=f61012d0b1cd846f dashboard link: https://syzkaller.appspot.com/bug?extid=13146364637c7363a7de compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.1 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=104d7cc5300000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1333ce0e300000

The issue was bisected to:

commit a154d5d83d21af6b9ee32adc5dbcea5ac1fb534c Author: Arnd Bergmann arnd@arndb.de Date: Mon Mar 4 20:38:03 2019 +0000

net: ignore sysctl_devconf_inherit_init_net without SYSCTL

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13f970b6300000 final oops: https://syzkaller.appspot.com/x/report.txt?x=100570b6300000 console output: https://syzkaller.appspot.com/x/log.txt?x=17f970b6300000

IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+13146364637c7363a7de@syzkaller.appspotmail.com Fixes: a154d5d83d21 ("net: ignore sysctl_devconf_inherit_init_net without SYSCTL")

================================================================== BUG: KASAN: slab-out-of-bounds in ext4_write_inline_data fs/ext4/inline.c:245 [inline] BUG: KASAN: slab-out-of-bounds in ext4_write_inline_data_end+0x4d4/0x960 fs/ext4/inline.c:754 Write of size 70 at addr ffff8880195444ef by task syz-executor279/8426

CPU: 0 PID: 8426 Comm: syz-executor279 Not tainted 5.14.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1ae/0x29f lib/dump_stack.c:105 print_address_description+0x66/0x3b0 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report+0x163/0x210 mm/kasan/report.c:436 check_region_inline mm/kasan/generic.c:135 [inline] kasan_check_range+0x2b5/0x2f0 mm/kasan/generic.c:189 memcpy+0x3c/0x60 mm/kasan/shadow.c:66 ext4_write_inline_data fs/ext4/inline.c:245 [inline] ext4_write_inline_data_end+0x4d4/0x960 fs/ext4/inline.c:754 ext4_write_end+0x1ff/0xbd0 fs/ext4/inode.c:1290 generic_perform_write+0x361/0x580 mm/filemap.c:3667 ext4_buffered_write_iter+0x41c/0x590 fs/ext4/file.c:269 ext4_file_write_iter+0x8f7/0x1b90 fs/ext4/file.c:519 call_write_iter include/linux/fs.h:2114 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0xa39/0xc90 fs/read_write.c:605 ksys_write+0x171/0x2a0 fs/read_write.c:658 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x44ac89 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff12e8852f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00000000004ce4d0 RCX: 000000000044ac89 RDX: 0000000000000082 RSI: 0000000020000180 RDI: 0000000000000006 RBP: 000000000049de98 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e R13: 024645fc87234f45 R14: 26e1d8b70aefbc5b R15: 00000000004ce4d8

Allocated by task 1: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x96/0xd0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:2959 [inline] slab_alloc mm/slub.c:2967 [inline] kmem_cache_alloc+0x1d1/0x340 mm/slub.c:2972 kmem_cache_zalloc include/linux/slab.h:711 [inline] acpi_os_acquire_object include/acpi/platform/aclinuxex.h:67 [inline] acpi_ut_allocate_object_desc_dbg+0xd8/0x165 drivers/acpi/acpica/utobject.c:359 acpi_ut_create_internal_object_dbg+0x21/0x195 drivers/acpi/acpica/utobject.c:69 acpi_ds_build_internal_object+0x15f/0x732 drivers/acpi/acpica/dsobject.c:94 acpi_ds_create_node+0xe9/0x1a8 drivers/acpi/acpica/dsobject.c:281 acpi_ds_load2_end_op+0x7d0/0xebc drivers/acpi/acpica/dswload2.c:618 acpi_ds_exec_end_op+0x6ce/0x11d4 drivers/acpi/acpica/dswexec.c:637 acpi_ps_parse_loop+0xd9f/0x1cf0 drivers/acpi/acpica/psloop.c:525 acpi_ps_parse_aml+0x1d5/0x955 drivers/acpi/acpica/psparse.c:475 acpi_ps_execute_table+0x317/0x3ef drivers/acpi/acpica/psxface.c:295 acpi_ns_execute_table+0x436/0x5bf drivers/acpi/acpica/nsparse.c:116 acpi_ns_load_table+0x5e/0x120 drivers/acpi/acpica/nsload.c:71 acpi_tb_load_namespace+0x456/0x6b9 drivers/acpi/acpica/tbxfload.c:186 acpi_load_tables+0x45/0xf5 drivers/acpi/acpica/tbxfload.c:59 acpi_bus_init+0x9a/0x993 drivers/acpi/bus.c:1213 acpi_init+0x8c/0x22c drivers/acpi/bus.c:1324 do_one_initcall+0x197/0x3f0 init/main.c:1287 do_initcall_level+0x14a/0x1f5 init/main.c:1360 do_initcalls+0x4b/0x8c init/main.c:1376 kernel_init_freeable+0x3f1/0x57e init/main.c:1598 kernel_init+0x19/0x2a0 init/main.c:1490 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

The buggy address belongs to the object at ffff8880195444e0 which belongs to the cache Acpi-Operand of size 72 The buggy address is located 15 bytes inside of 72-byte region [ffff8880195444e0, ffff888019544528) The buggy address belongs to the page: page:ffffea0000655100 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888019544068 pfn:0x19544 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0000654f88 ffffea0000654e08 ffff8880110c2b40 raw: ffff888019544068 000000000027001d 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, ts 3012488798, free_ts 0 prep_new_page mm/page_alloc.c:2436 [inline] get_page_from_freelist+0x779/0xa30 mm/page_alloc.c:4169 __alloc_pages+0x26c/0x5f0 mm/page_alloc.c:5391 alloc_page_interleave+0x22/0x1c0 mm/mempolicy.c:2119 alloc_slab_page mm/slub.c:1691 [inline] allocate_slab+0xf1/0x540 mm/slub.c:1831 new_slab mm/slub.c:1894 [inline] new_slab_objects mm/slub.c:2640 [inline] ___slab_alloc+0x1cf/0x350 mm/slub.c:2803 __slab_alloc mm/slub.c:2843 [inline] slab_alloc_node mm/slub.c:2925 [inline] slab_alloc mm/slub.c:2967 [inline] kmem_cache_alloc+0x299/0x340 mm/slub.c:2972 kmem_cache_zalloc include/linux/slab.h:711 [inline] acpi_os_acquire_object include/acpi/platform/aclinuxex.h:67 [inline] acpi_ut_allocate_object_desc_dbg+0xd8/0x165 drivers/acpi/acpica/utobject.c:359 acpi_ut_create_internal_object_dbg+0x21/0x195 drivers/acpi/acpica/utobject.c:69 acpi_ds_build_internal_object+0x15f/0x732 drivers/acpi/acpica/dsobject.c:94 acpi_ds_create_node+0xe9/0x1a8 drivers/acpi/acpica/dsobject.c:281 acpi_ds_load2_end_op+0x7d0/0xebc drivers/acpi/acpica/dswload2.c:618 acpi_ds_exec_end_op+0x6ce/0x11d4 drivers/acpi/acpica/dswexec.c:637 acpi_ps_parse_loop+0xd9f/0x1cf0 drivers/acpi/acpica/psloop.c:525 acpi_ps_parse_aml+0x1d5/0x955 drivers/acpi/acpica/psparse.c:475 acpi_ps_execute_table+0x317/0x3ef drivers/acpi/acpica/psxface.c:295 acpi_ns_execute_table+0x436/0x5bf drivers/acpi/acpica/nsparse.c:116 page_owner free stack trace missing

Memory state around the buggy address: ffff888019544400: fc fc 00 00 00 00 00 00 00 00 00 fc fc fc fc 00 ffff888019544480: 00 00 00 00 00 00 00 00 fc fc fc fc 00 00 00 00

ffff888019544500: 00 00 00 00 00 fc fc fc fc fb fb fb fb fb fb fb

^ ffff888019544580: fb fb fc fc fc fc 00 00 00 00 00 00 00 00 00 fc ffff888019544600: fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc fc ================================================================== ---------------- Code disassembly (best guess), 1 bytes skipped: 0: ff c3 inc %ebx 2: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 9: 00 00 00 c: 0f 1f 40 00 nopl 0x0(%rax) 10: 48 89 f8 mov %rdi,%rax 13: 48 89 f7 mov %rsi,%rdi 16: 48 89 d6 mov %rdx,%rsi 19: 48 89 ca mov %rcx,%rdx 1c: 4d 89 c2 mov %r8,%r10 1f: 4d 89 c8 mov %r9,%r8 22: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9 27: 0f 05 syscall 29: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction 2f: 73 01 jae 0x32 31: c3 retq 32: 48 c7 c1 b8 ff ff ff mov $0xffffffffffffffb8,%rcx 39: f7 d8 neg %eax 3b: 64 89 01 mov %eax,%fs:(%rcx) 3e: 48 rex.W

--- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches