================================================================== BUG: KASAN: slab-out-of-bounds in __read_once_size include/linux/compiler.h:243 [inline] BUG: KASAN: slab-out-of-bounds in list_empty include/linux/list.h:189 [inline] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0x103/0x120 drivers/scsi/sg.c:2120 Read of size 8 at addr ffff8801c8695140 by task syzkaller419201/3361 CPU: 1 PID: 3361 Comm: syzkaller419201 Not tainted 4.9.77-g033d019 #14 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801c68af9b0 ffffffff81d941c9 ffffea000721a540 ffff8801c8695140 0000000000000000 ffff8801c8695140 ffff8801c719a338 ffff8801c68af9e8 ffffffff8153db93 ffff8801c8695140 0000000000000008 0000000000000000 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] print_address_description+0x73/0x280 mm/kasan/report.c:252 [] kasan_report_error mm/kasan/report.c:351 [inline] [] kasan_report+0x275/0x360 mm/kasan/report.c:408 [] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429 [] __read_once_size include/linux/compiler.h:243 [inline] [] list_empty include/linux/list.h:189 [inline] [] sg_remove_request+0x103/0x120 drivers/scsi/sg.c:2120 [] sg_finish_rem_req+0x295/0x340 drivers/scsi/sg.c:1838 [] sg_read+0xa1c/0x1440 drivers/scsi/sg.c:527 [] do_loop_readv_writev.part.17+0x141/0x1e0 fs/read_write.c:714 [] do_loop_readv_writev fs/read_write.c:880 [inline] [] do_readv_writev+0x520/0x750 fs/read_write.c:874 [] vfs_readv+0x84/0xc0 fs/read_write.c:898 [] do_readv+0xe6/0x250 fs/read_write.c:924 [] SYSC_readv fs/read_write.c:1011 [inline] [] SyS_readv+0x27/0x30 fs/read_write.c:1008 [] entry_SYSCALL_64_fastpath+0x29/0xe8 Allocated by task 0: (stack is not available) Freed by task 0: (stack is not available) The buggy address belongs to the object at ffff8801c8695100 which belongs to the cache fasync_cache of size 96 The buggy address is located 64 bytes inside of 96-byte region [ffff8801c8695100, ffff8801c8695160) The buggy address belongs to the page: page:ffffea000721a540 count:1 mapcount:0 mapping: (null) index:0x0 flags: 0x8000000000000080(slab) page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c8695000: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ffff8801c8695080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8801c8695100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8801c8695180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801c8695200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================