================================================================== BUG: KASAN: slab-out-of-bounds in tcp_retransmit_timer+0x2d30/0x3220 net/ipv4/tcp_timer.c:500 Read of size 8 at addr ffff88805df78310 by task kworker/u4:4/152 CPU: 0 PID: 152 Comm: kworker/u4:4 Not tainted 5.9.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: krdsd rds_tcp_accept_worker Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 tcp_retransmit_timer+0x2d30/0x3220 net/ipv4/tcp_timer.c:500 tcp_write_timer_handler+0x79b/0xa60 net/ipv4/tcp_timer.c:611 tcp_write_timer+0xa2/0x2b0 net/ipv4/tcp_timer.c:631 call_timer_fn+0x1ac/0x760 kernel/time/timer.c:1413 expire_timers kernel/time/timer.c:1458 [inline] __run_timers.part.0+0x67c/0xaa0 kernel/time/timer.c:1755 __run_timers kernel/time/timer.c:1736 [inline] run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1768 __do_softirq+0x2de/0xa24 kernel/softirq.c:298 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] do_softirq_own_stack+0x9d/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x1f3/0x230 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x51/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [inline] RIP: 0010:slab_alloc mm/slab.c:3305 [inline] RIP: 0010:kmem_cache_alloc+0x100/0x3a0 mm/slab.c:3482 Code: 41 f7 c4 00 02 00 00 4c 89 7c 24 08 0f 84 d2 00 00 00 e8 23 b2 c5 ff 48 83 3d f3 b6 01 08 00 0f 84 9b 02 00 00 4c 89 e7 57 9d <0f> 1f 44 00 00 4c 8b 44 24 08 41 0f 18 08 e9 99 01 00 00 f6 c7 01 RSP: 0018:ffffc90001577b18 EFLAGS: 00000282 RAX: 00000000096b7859 RBX: 0000000000000cc0 RCX: 0000000000000006 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000282 RBP: ffff8880a9049d00 R08: 0000000000000001 R09: ffffffff8c5f5ac7 R10: fffffbfff18beb58 R11: 0000000000000000 R12: 0000000000000282 R13: 0000000000000cc0 R14: ffff8880a9049d00 R15: ffff88804516da80 sock_alloc_inode+0x18/0x1c0 net/socket.c:253 alloc_inode+0x61/0x230 fs/inode.c:232 new_inode_pseudo+0x14/0xe0 fs/inode.c:928 sock_alloc+0x3c/0x260 net/socket.c:573 sock_create_lite+0x7b/0x120 net/socket.c:1226 rds_tcp_accept_one+0x14f/0xbe0 net/rds/tcp_listen.c:115 rds_tcp_accept_worker+0x50/0x80 net/rds/tcp.c:515 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Allocated by task 32340: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461 slab_post_alloc_hook mm/slab.h:518 [inline] slab_alloc mm/slab.c:3312 [inline] kmem_cache_alloc+0x138/0x3a0 mm/slab.c:3482 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138 getname_flags include/linux/audit.h:320 [inline] getname+0x8e/0xd0 fs/namei.c:209 do_sys_openat2+0xf5/0x420 fs/open.c:1162 do_sys_open fs/open.c:1184 [inline] __do_sys_open fs/open.c:1192 [inline] __se_sys_open fs/open.c:1188 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1188 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 32340: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355 __kasan_slab_free+0xd8/0x120 mm/kasan/common.c:422 __cache_free mm/slab.c:3418 [inline] kmem_cache_free.part.0+0x67/0x1f0 mm/slab.c:3693 putname+0xe1/0x120 fs/namei.c:259 do_sys_openat2+0x153/0x420 fs/open.c:1177 do_sys_open fs/open.c:1184 [inline] __do_sys_open fs/open.c:1192 [inline] __se_sys_open fs/open.c:1188 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1188 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff88805df78600 which belongs to the cache names_cache of size 4096 The buggy address is located 752 bytes to the left of 4096-byte region [ffff88805df78600, ffff88805df79600) The buggy address belongs to the page: page:00000000438a1cb4 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5df78 head:00000000438a1cb4 order:1 compound_mapcount:0 flags: 0xfffe0000010200(slab|head) raw: 00fffe0000010200 ffffea0001615688 ffffea0001847488 ffff8880aa241c00 raw: 0000000000000000 ffff88805df78600 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88805df78200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805df78280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88805df78300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88805df78380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805df78400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================