Hello, When using Healer to fuzz the latest Linux kernel, the following crash was triggered. HEAD commit: 6b75d88fa81b Merge branch 'i2c/for-current' git tree: upstream console output: https://paste.ubuntu.com/p/tfT6HTv37Q/ kernel config: https://paste.ubuntu.com/p/b62Hp7BfJn/ Sorry, I don't have a reproducer for this crash, hope the symbolized report can help. If you fix this issue, please add the following tag to the commit: Reported-by: Hao Sun <sunhao.th@xxxxxxxxx> ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409 ___sys_sendmsg+0x100/0x170 net/socket.c:2463 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2492 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f0bc939bc4d Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0bc6903c58 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f0bc94c20a0 RCX: 00007f0bc939bc4d RDX: 000000000004c084 RSI: 0000000020001240 RDI: 0000000000000006 RBP: 00007f0bc9414d80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0bc94c20a0 R13: 00007ffc009b097f R14: 00007ffc009b0b20 R15: 00007f0bc6903dc0 </TASK> Mem-Info: active_anon:238 inactive_anon:9082 isolated_anon:0 active_file:23399 inactive_file:5490 isolated_file:0 unevictable:768 dirty:0 writeback:1 slab_reclaimable:20646 slab_unreclaimable:53628 mapped:13097 shmem:6261 pagetables:541 bounce:0 kernel_misc_reclaimable:0 free:621846 free_pcp:12564 free_cma:0 Node 0 active_anon:756kB inactive_anon:30820kB active_file:78692kB inactive_file:17060kB unevictable:1536kB isolated(anon):0kB isolated(file):0kB mapped:46296kB dirty:0kB writeback:0kB shmem:19304kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 4096kB writeback_tmp:0kB kernel_stack:7536kB pagetables:1940kB all_unreclaimable? no Node 1 active_anon:196kB inactive_anon:5508kB active_file:14904kB inactive_file:4900kB unevictable:1536kB isolated(anon):0kB isolated(file):0kB mapped:6092kB dirty:0kB writeback:4kB shmem:5740kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 0kB writeback_tmp:0kB kernel_stack:1236kB pagetables:224kB all_unreclaimable? no Node 0 DMA free:15280kB boost:0kB min:424kB low:528kB high:632kB reserved_highatomic:0KB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15992kB managed:15360kB mlocked:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB lowmem_reserve[]: 0 1336 1336 1336 1336 Node 0 DMA32 free:858724kB boost:0kB min:38056kB low:47568kB high:57080kB reserved_highatomic:0KB active_anon:756kB inactive_anon:30820kB active_file:78692kB inactive_file:17060kB unevictable:1536kB writepending:0kB present:2080768kB managed:1375804kB mlocked:0kB bounce:0kB free_pcp:31720kB local_pcp:5268kB free_cma:0kB lowmem_reserve[]: 0 0 0 0 0 Node 1 DMA32 free:982908kB boost:0kB min:27340kB low:34172kB high:41004kB reserved_highatomic:0KB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:1048444kB managed:982908kB mlocked:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB lowmem_reserve[]: 0 0 852 852 852 Node 1 Normal free:628680kB boost:0kB min:24284kB low:30352kB high:36420kB reserved_highatomic:0KB active_anon:196kB inactive_anon:5508kB active_file:14904kB inactive_file:4900kB unevictable:1536kB writepending:4kB present:1048576kB managed:873036kB mlocked:0kB bounce:0kB free_pcp:18892kB local_pcp:6628kB free_cma:0kB lowmem_reserve[]: 0 0 0 0 0 Node 0 DMA: 0*4kB 0*8kB 1*16kB (U) 1*32kB (U) 0*64kB 1*128kB (U) 1*256kB (U) 1*512kB (U) 0*1024kB 1*2048kB (M) 3*4096kB (M) = 15280kB Node 0 DMA32: 125*4kB (UME) 408*8kB (UME) 215*16kB (UME) 622*32kB (UME) 102*64kB (UME) 76*128kB (UME) 35*256kB (UME) 15*512kB (UME) 6*1024kB (UM) 5*2048kB (UME) 191*4096kB (UM) = 858724kB Node 1 DMA32: 1*4kB (M) 1*8kB (M) 1*16kB (M) 1*32kB (M) 1*64kB (M) 0*128kB 1*256kB (M) 1*512kB (M) 1*1024kB (M) 1*2048kB (M) 239*4096kB (M) = 982908kB Node 1 Normal: 680*4kB (UME) 257*8kB (UME) 222*16kB (UME) 43*32kB (ME) 255*64kB (UME) 131*128kB (UME) 58*256kB (UME) 36*512kB (UME) 17*1024kB (UM) 7*2048kB (UME) 127*4096kB (M) = 628008kB Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB Node 0 hugepages_total=2 hugepages_free=2 hugepages_surp=0 hugepages_size=2048kB Node 1 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB Node 1 hugepages_total=2 hugepages_free=2 hugepages_surp=0 hugepages_size=2048kB 35151 total pagecache pages 0 pages in swap cache Swap cache stats: add 0, delete 0, find 0/0 Free swap = 0kB Total swap = 0kB 1048445 pages RAM 0 pages HighMem/MovableOnly 236668 pages reserved 0 pages cma reserved ================================================================== BUG: KASAN: use-after-free in rxe_queue_cleanup+0xf4/0x100 drivers/infiniband/sw/rxe/rxe_queue.c:193 Read of size 8 at addr ffff888016d4e410 by task syz-executor/26230 CPU: 3 PID: 26230 Comm: syz-executor Not tainted 5.15.0+ #6 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x93/0x337 mm/kasan/report.c:256 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 rxe_queue_cleanup+0xf4/0x100 drivers/infiniband/sw/rxe/rxe_queue.c:193 rxe_qp_do_cleanup+0x5c/0x720 drivers/infiniband/sw/rxe/rxe_qp.c:804 execute_in_process_context+0x37/0x150 kernel/workqueue.c:3359 rxe_elem_release+0x9f/0x180 drivers/infiniband/sw/rxe/rxe_pool.c:407 kref_put include/linux/kref.h:65 [inline] rxe_create_qp+0x32c/0x3b0 drivers/infiniband/sw/rxe/rxe_verbs.c:450 create_qp+0x50c/0x880 drivers/infiniband/core/verbs.c:1238 ib_create_qp_kernel+0x9d/0x310 drivers/infiniband/core/verbs.c:1349 ib_create_qp include/rdma/ib_verbs.h:3722 [inline] create_mad_qp+0x171/0x2c0 drivers/infiniband/core/mad.c:2910 ib_mad_port_open drivers/infiniband/core/mad.c:2991 [inline] ib_mad_init_device+0xa16/0xfa0 drivers/infiniband/core/mad.c:3082 add_client_context+0x3fb/0x5e0 drivers/infiniband/core/device.c:720 enable_device_and_get+0x1cd/0x3b0 drivers/infiniband/core/device.c:1331 ib_register_device drivers/infiniband/core/device.c:1419 [inline] ib_register_device+0x823/0xb10 drivers/infiniband/core/device.c:1365 rxe_register_device+0x2fe/0x3b0 drivers/infiniband/sw/rxe/rxe_verbs.c:1146 rxe_add+0x12b6/0x16f0 drivers/infiniband/sw/rxe/rxe.c:248 rxe_net_add+0x8c/0xe0 drivers/infiniband/sw/rxe/rxe_net.c:543 rxe_newlink drivers/infiniband/sw/rxe/rxe.c:270 [inline] rxe_newlink+0xb7/0xe0 drivers/infiniband/sw/rxe/rxe.c:251 nldev_newlink+0x292/0x440 drivers/infiniband/core/nldev.c:1717 rdma_nl_rcv_msg drivers/infiniband/core/netlink.c:195 [inline] rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline] rdma_nl_rcv+0x3a8/0xa60 drivers/infiniband/core/netlink.c:259 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x533/0x740 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x86d/0xda0 net/netlink/af_netlink.c:1916 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409 ___sys_sendmsg+0x100/0x170 net/socket.c:2463 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2492 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f0bc939bc4d Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0bc6903c58 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f0bc94c20a0 RCX: 00007f0bc939bc4d RDX: 000000000004c084 RSI: 0000000020001240 RDI: 0000000000000006 RBP: 00007f0bc9414d80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0bc94c20a0 R13: 00007ffc009b097f R14: 00007ffc009b0b20 R15: 00007f0bc6903dc0 </TASK> Allocated by task 26230: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:522 kasan_kmalloc include/linux/kasan.h:269 [inline] kmem_cache_alloc_trace+0x198/0x390 mm/slub.c:3261 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:724 [inline] rxe_queue_init+0x98/0x500 drivers/infiniband/sw/rxe/rxe_queue.c:66 rxe_qp_init_req drivers/infiniband/sw/rxe/rxe_qp.c:233 [inline] rxe_qp_from_init+0x91c/0x1bc0 drivers/infiniband/sw/rxe/rxe_qp.c:347 rxe_create_qp+0x231/0x3b0 drivers/infiniband/sw/rxe/rxe_verbs.c:442 create_qp+0x50c/0x880 drivers/infiniband/core/verbs.c:1238 ib_create_qp_kernel+0x9d/0x310 drivers/infiniband/core/verbs.c:1349 ib_create_qp include/rdma/ib_verbs.h:3722 [inline] create_mad_qp+0x171/0x2c0 drivers/infiniband/core/mad.c:2910 ib_mad_port_open drivers/infiniband/core/mad.c:2991 [inline] ib_mad_init_device+0xa16/0xfa0 drivers/infiniband/core/mad.c:3082 add_client_context+0x3fb/0x5e0 drivers/infiniband/core/device.c:720 enable_device_and_get+0x1cd/0x3b0 drivers/infiniband/core/device.c:1331 ib_register_device drivers/infiniband/core/device.c:1419 [inline] ib_register_device+0x823/0xb10 drivers/infiniband/core/device.c:1365 rxe_register_device+0x2fe/0x3b0 drivers/infiniband/sw/rxe/rxe_verbs.c:1146 rxe_add+0x12b6/0x16f0 drivers/infiniband/sw/rxe/rxe.c:248 rxe_net_add+0x8c/0xe0 drivers/infiniband/sw/rxe/rxe_net.c:543 rxe_newlink drivers/infiniband/sw/rxe/rxe.c:270 [inline] rxe_newlink+0xb7/0xe0 drivers/infiniband/sw/rxe/rxe.c:251 nldev_newlink+0x292/0x440 drivers/infiniband/core/nldev.c:1717 rdma_nl_rcv_msg drivers/infiniband/core/netlink.c:195 [inline] rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline] rdma_nl_rcv+0x3a8/0xa60 drivers/infiniband/core/netlink.c:259 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x533/0x740 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x86d/0xda0 net/netlink/af_netlink.c:1916 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409 ___sys_sendmsg+0x100/0x170 net/socket.c:2463 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2492 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 26230: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0x100/0x140 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:1723 [inline] slab_free_freelist_hook mm/slub.c:1749 [inline] slab_free mm/slub.c:3513 [inline] kfree+0x107/0x4c0 mm/slub.c:4561 rxe_qp_from_init+0x11c5/0x1bc0 drivers/infiniband/sw/rxe/rxe_qp.c:361 rxe_create_qp+0x231/0x3b0 drivers/infiniband/sw/rxe/rxe_verbs.c:442 create_qp+0x50c/0x880 drivers/infiniband/core/verbs.c:1238 ib_create_qp_kernel+0x9d/0x310 drivers/infiniband/core/verbs.c:1349 ib_create_qp include/rdma/ib_verbs.h:3722 [inline] create_mad_qp+0x171/0x2c0 drivers/infiniband/core/mad.c:2910 ib_mad_port_open drivers/infiniband/core/mad.c:2991 [inline] ib_mad_init_device+0xa16/0xfa0 drivers/infiniband/core/mad.c:3082 add_client_context+0x3fb/0x5e0 drivers/infiniband/core/device.c:720 enable_device_and_get+0x1cd/0x3b0 drivers/infiniband/core/device.c:1331 ib_register_device drivers/infiniband/core/device.c:1419 [inline] ib_register_device+0x823/0xb10 drivers/infiniband/core/device.c:1365 rxe_register_device+0x2fe/0x3b0 drivers/infiniband/sw/rxe/rxe_verbs.c:1146 rxe_add+0x12b6/0x16f0 drivers/infiniband/sw/rxe/rxe.c:248 rxe_net_add+0x8c/0xe0 drivers/infiniband/sw/rxe/rxe_net.c:543 rxe_newlink drivers/infiniband/sw/rxe/rxe.c:270 [inline] rxe_newlink+0xb7/0xe0 drivers/infiniband/sw/rxe/rxe.c:251 nldev_newlink+0x292/0x440 drivers/infiniband/core/nldev.c:1717 rdma_nl_rcv_msg drivers/infiniband/core/netlink.c:195 [inline] rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline] rdma_nl_rcv+0x3a8/0xa60 drivers/infiniband/core/netlink.c:259 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x533/0x740 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x86d/0xda0 net/netlink/af_netlink.c:1916 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409 ___sys_sendmsg+0x100/0x170 net/socket.c:2463 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2492 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Last potentially related work creation: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 __kasan_record_aux_stack+0xf5/0x120 mm/kasan/generic.c:348 kvfree_call_rcu+0x74/0xab0 kernel/rcu/tree.c:3550 dropmon_net_event+0x229/0x480 net/core/drop_monitor.c:1578 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info net/core/dev.c:2002 [inline] call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1987 call_netdevice_notifiers_extack net/core/dev.c:2014 [inline] call_netdevice_notifiers net/core/dev.c:2028 [inline] unregister_netdevice_many+0x930/0x14e0 net/core/dev.c:11074 default_device_exit_batch+0x302/0x3c0 net/core/dev.c:11604 ops_exit_list.isra.0+0x103/0x150 net/core/net_namespace.c:171 cleanup_net+0x511/0xa90 net/core/net_namespace.c:593 process_one_work+0x9df/0x16d0 kernel/workqueue.c:2298 worker_thread+0x90/0xed0 kernel/workqueue.c:2445 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff888016d4e400 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 16 bytes inside of 64-byte region [ffff888016d4e400, ffff888016d4e440) The buggy address belongs to the page: page:ffffea00005b5380 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x16d4e flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea000061aa40 dead000000000002 ffff888010c42640 raw: 0000000000000000 0000000080200020 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 22769224362, free_ts 22695025907 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook mm/page_alloc.c:2412 [inline] prep_new_page+0x1a5/0x240 mm/page_alloc.c:2418 get_page_from_freelist+0x1eed/0x3b50 mm/page_alloc.c:4149 __alloc_pages+0x306/0x6e0 mm/page_alloc.c:5369 alloc_page_interleave+0x1e/0x250 mm/mempolicy.c:2036 alloc_pages+0x1e4/0x240 mm/mempolicy.c:2186 alloc_slab_page mm/slub.c:1793 [inline] allocate_slab mm/slub.c:1930 [inline] new_slab+0x35e/0x4b0 mm/slub.c:1993 ___slab_alloc+0xae6/0x1120 mm/slub.c:3022 __slab_alloc.isra.0+0x4d/0xa0 mm/slub.c:3109 slab_alloc_node mm/slub.c:3200 [inline] slab_alloc mm/slub.c:3242 [inline] kmem_cache_alloc_trace+0x334/0x390 mm/slub.c:3259 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:724 [inline] rtnl_register_internal+0x4b0/0x5b0 net/core/rtnetlink.c:202 ipv6_addr_label_rtnl_register+0x5f/0xa8 net/ipv6/addrlabel.c:642 addrconf_init+0x337/0x3b5 net/ipv6/addrconf.c:7285 inet6_init+0x368/0x72e net/ipv6/af_inet6.c:1149 do_one_initcall+0x103/0x650 init/main.c:1295 do_initcall_level init/main.c:1368 [inline] do_initcalls init/main.c:1384 [inline] do_basic_setup init/main.c:1403 [inline] kernel_init_freeable+0x6c3/0x74c init/main.c:1608 kernel_init+0x1a/0x1d0 init/main.c:1497 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1338 [inline] free_pcp_prepare+0x473/0x9f0 mm/page_alloc.c:1389 free_unref_page_prepare mm/page_alloc.c:3309 [inline] free_unref_page+0x19/0x5b0 mm/page_alloc.c:3388 __unfreeze_partials+0x343/0x360 mm/slub.c:2527 qlink_free mm/kasan/quarantine.c:146 [inline] qlist_free_all+0x5a/0xc0 mm/kasan/quarantine.c:165 kasan_quarantine_reduce+0x13d/0x180 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:259 [inline] slab_post_alloc_hook+0x4d/0x4a0 mm/slab.h:519 slab_alloc_node mm/slub.c:3234 [inline] slab_alloc mm/slub.c:3242 [inline] kmem_cache_alloc_trace+0x157/0x390 mm/slub.c:3259 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:724 [inline] bus_add_driver+0xd4/0x630 drivers/base/bus.c:602 driver_register+0x1c4/0x330 drivers/base/driver.c:171 usb_register_driver+0x249/0x460 drivers/usb/core/driver.c:1061 do_one_initcall+0x103/0x650 init/main.c:1295 do_initcall_level init/main.c:1368 [inline] do_initcalls init/main.c:1384 [inline] do_basic_setup init/main.c:1403 [inline] kernel_init_freeable+0x6c3/0x74c init/main.c:1608 kernel_init+0x1a/0x1d0 init/main.c:1497 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff888016d4e300: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff888016d4e380: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888016d4e400: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff888016d4e480: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888016d4e500: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================
