================================================================== BUG: KASAN: use-after-free in rxrpc_send_keepalive+0x8a2/0x940 net/rxrpc/output.c:634 Read of size 8 at addr ffff8880a8308818 by task kworker/0:9/12997 CPU: 0 PID: 12997 Comm: kworker/0:9 Not tainted 5.4.0-rc3+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: krxrpcd rxrpc_peer_keepalive_worker Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506 kasan_report+0x12/0x20 mm/kasan/common.c:634 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 rxrpc_send_keepalive+0x8a2/0x940 net/rxrpc/output.c:634 rxrpc_peer_keepalive_dispatch net/rxrpc/peer_event.c:369 [inline] rxrpc_peer_keepalive_worker+0x7be/0xd02 net/rxrpc/peer_event.c:430 process_one_work+0x9af/0x1740 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Allocated by task 9021: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:510 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:483 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:524 kmem_cache_alloc_trace+0x158/0x790 mm/slab.c:3550 kmalloc include/linux/slab.h:556 [inline] syslog_print kernel/printk/printk.c:1356 [inline] do_syslog kernel/printk/printk.c:1529 [inline] do_syslog+0x5fa/0x1820 kernel/printk/printk.c:1503 kmsg_read+0x8f/0xc0 fs/proc/kmsg.c:40 proc_reg_read+0x1fc/0x2c0 fs/proc/inode.c:223 __vfs_read+0x8a/0x110 fs/read_write.c:425 vfs_read+0x1f0/0x440 fs/read_write.c:461 ksys_read+0x14f/0x290 fs/read_write.c:587 __do_sys_read fs/read_write.c:597 [inline] __se_sys_read fs/read_write.c:595 [inline] __x64_sys_read+0x73/0xb0 fs/read_write.c:595 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 9021: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] kasan_set_free_info mm/kasan/common.c:332 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:471 kasan_slab_free+0xe/0x10 mm/kasan/common.c:480 __cache_free mm/slab.c:3425 [inline] kfree+0x10a/0x2c0 mm/slab.c:3756 syslog_print kernel/printk/printk.c:1415 [inline] do_syslog kernel/printk/printk.c:1529 [inline] do_syslog+0x918/0x1820 kernel/printk/printk.c:1503 kmsg_read+0x8f/0xc0 fs/proc/kmsg.c:40 proc_reg_read+0x1fc/0x2c0 fs/proc/inode.c:223 __vfs_read+0x8a/0x110 fs/read_write.c:425 vfs_read+0x1f0/0x440 fs/read_write.c:461 ksys_read+0x14f/0x290 fs/read_write.c:587 __do_sys_read fs/read_write.c:597 [inline] __se_sys_read fs/read_write.c:595 [inline] __x64_sys_read+0x73/0xb0 fs/read_write.c:595 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a8308800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 24 bytes inside of 1024-byte region [ffff8880a8308800, ffff8880a8308c00) The buggy address belongs to the page: page:ffffea0002a0c200 refcount:1 mapcount:0 mapping:ffff8880aa400c40 index:0xffff8880a8308000 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea0002568748 ffffea0002a42188 ffff8880aa400c40 raw: ffff8880a8308000 ffff8880a8308000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a8308700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a8308780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880a8308800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a8308880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a8308900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================