bisecting cause commit starting from 9936328b41ce4bce8f20269dcac8cb476c8d0820 building syzkaller on 98c1bf1cfb0f9530ab2107c29a52ba15fc4fefa3 testing commit 9936328b41ce4bce8f20269dcac8cb476c8d0820 with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in rdma_listen run #1: crashed: KASAN: use-after-free Read in cma_cancel_operation run #2: basic kernel testing failed: timed out run #3: basic kernel testing failed: timed out run #4: basic kernel testing failed: timed out run #5: basic kernel testing failed: timed out run #6: basic kernel testing failed: timed out run #7: basic kernel testing failed: timed out run #8: basic kernel testing failed: timed out run #9: basic kernel testing failed: timed out testing release v5.0 testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0 all runs: basic kernel testing failed: timed out testing release v4.20 testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in rdma_listen run #1: crashed: KASAN: use-after-free Read in rdma_listen run #2: crashed: KASAN: use-after-free Read in rdma_listen run #3: crashed: KASAN: use-after-free Read in rdma_listen run #4: crashed: KASAN: use-after-free Read in rdma_listen run #5: crashed: KASAN: use-after-free Read in rdma_listen run #6: crashed: KASAN: use-after-free Read in cma_cancel_operation run #7: crashed: KASAN: use-after-free Read in rdma_listen run #8: crashed: KASAN: use-after-free Read in rdma_listen run #9: crashed: KASAN: use-after-free Read in cma_cancel_operation testing release v4.19 testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in rdma_listen run #1: crashed: KASAN: use-after-free Read in rdma_listen run #2: crashed: KASAN: use-after-free Read in rdma_listen run #3: crashed: KASAN: use-after-free Read in rdma_listen run #4: crashed: KASAN: use-after-free Read in cma_cancel_operation run #5: crashed: KASAN: use-after-free Read in rdma_listen run #6: crashed: KASAN: use-after-free Read in rdma_listen run #7: crashed: KASAN: use-after-free Read in rdma_listen run #8: crashed: KASAN: use-after-free Read in cma_cancel_operation run #9: crashed: KASAN: use-after-free Read in rdma_listen testing release v4.18 testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0 all runs: crashed: KASAN: use-after-free Read in rdma_listen testing release v4.17 testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in rdma_listen run #1: crashed: KASAN: use-after-free Read in rdma_listen run #2: crashed: KASAN: use-after-free Read in rdma_listen run #3: crashed: KASAN: use-after-free Read in rdma_listen run #4: crashed: KASAN: use-after-free Read in cma_cancel_operation run #5: crashed: KASAN: use-after-free Read in rdma_listen run #6: crashed: KASAN: use-after-free Read in cma_cancel_operation run #7: crashed: KASAN: use-after-free Read in cma_cancel_operation run #8: crashed: KASAN: use-after-free Read in rdma_listen run #9: crashed: KASAN: use-after-free Read in rdma_listen testing release v4.16 testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in rdma_listen run #1: crashed: KASAN: use-after-free Read in rdma_listen run #2: crashed: KASAN: use-after-free Read in rdma_listen run #3: crashed: KASAN: use-after-free Read in rdma_listen run #4: crashed: KASAN: use-after-free Read in rdma_listen run #5: crashed: KASAN: use-after-free Read in cma_cancel_operation run #6: crashed: KASAN: use-after-free Read in rdma_listen run #7: crashed: KASAN: use-after-free Read in rdma_listen run #8: crashed: KASAN: use-after-free Read in rdma_listen run #9: crashed: KASAN: use-after-free Read in rdma_listen testing release v4.15 testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in rdma_listen run #1: crashed: KASAN: use-after-free Read in rdma_listen run #2: crashed: KASAN: use-after-free Read in rdma_listen run #3: crashed: KASAN: use-after-free Read in rdma_listen run #4: crashed: KASAN: use-after-free Read in cma_cancel_operation run #5: crashed: KASAN: use-after-free Read in rdma_listen run #6: crashed: KASAN: use-after-free Read in rdma_listen run #7: crashed: KASAN: use-after-free Read in rdma_listen run #8: crashed: KASAN: use-after-free Read in rdma_listen run #9: crashed: KASAN: use-after-free Read in rdma_listen testing release v4.14 testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in rdma_listen run #1: crashed: KASAN: use-after-free Read in cma_cancel_operation run #2: crashed: KASAN: use-after-free Read in rdma_listen run #3: crashed: KASAN: use-after-free Read in rdma_listen run #4: crashed: KASAN: use-after-free Read in rdma_listen run #5: crashed: KASAN: use-after-free Read in cma_cancel_operation run #6: crashed: KASAN: use-after-free Read in rdma_listen run #7: crashed: KASAN: use-after-free Read in rdma_listen run #8: crashed: KASAN: use-after-free Read in rdma_listen run #9: crashed: KASAN: use-after-free Read in rdma_listen testing release v4.13 testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in rdma_listen run #1: basic kernel testing failed: timed out run #2: basic kernel testing failed: timed out run #3: basic kernel testing failed: timed out run #4: basic kernel testing failed: timed out run #5: basic kernel testing failed: timed out run #6: basic kernel testing failed: timed out run #7: crashed: KASAN: use-after-free Read in rdma_listen run #8: basic kernel testing failed: timed out run #9: crashed: KASAN: use-after-free Read in rdma_listen testing release v4.12 testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0 run #0: basic kernel testing failed: timed out run #1: basic kernel testing failed: timed out run #2: basic kernel testing failed: timed out run #3: crashed: KASAN: use-after-free Read in rdma_listen run #4: basic kernel testing failed: timed out run #5: crashed: KASAN: use-after-free Read in rdma_listen run #6: crashed: KASAN: use-after-free Read in rdma_listen run #7: crashed: KASAN: use-after-free Read in cma_cancel_operation run #8: crashed: KASAN: use-after-free Read in rdma_listen run #9: crashed: KASAN: use-after-free Read in rdma_listen testing release v4.11 testing commit a351e9b9fc24e982ec2f0e76379a49826036da12 with gcc (GCC) 7.3.0 all runs: basic kernel testing failed: timed out testing release v4.10 testing commit c470abd4fde40ea6a0846a2beab642a578c0b8cd with gcc (GCC) 5.5.0 failed to run ["make" "bzImage" "-j" "64" "CC=/syzkaller/bisect_bin/gcc-5.5.0/bin/gcc"]: exit status 2 testing release v4.9 testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0 failed to run ["make" "bzImage" "-j" "64" "CC=/syzkaller/bisect_bin/gcc-5.5.0/bin/gcc"]: exit status 2 testing release v4.8 testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0 failed to run ["make" "bzImage" "-j" "64" "CC=/syzkaller/bisect_bin/gcc-5.5.0/bin/gcc"]: exit status 2 testing release v4.7 testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0 failed to run ["make" "bzImage" "-j" "64" "CC=/syzkaller/bisect_bin/gcc-5.5.0/bin/gcc"]: exit status 2 testing release v4.6 testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0 failed to run ["make" "bzImage" "-j" "64" "CC=/syzkaller/bisect_bin/gcc-5.5.0/bin/gcc"]: exit status 2 testing release v4.5 testing commit b562e44f507e863c6792946e4e1b1449fbbac85d with gcc (GCC) 5.5.0 failed to run ["make" "bzImage" "-j" "64" "CC=/syzkaller/bisect_bin/gcc-5.5.0/bin/gcc"]: exit status 2 testing release v4.4 testing commit afd2ff9b7e1b367172f18ba7f693dfb62bdcb2dc with gcc (GCC) 5.5.0 failed to run ["make" "bzImage" "-j" "64" "CC=/syzkaller/bisect_bin/gcc-5.5.0/bin/gcc"]: exit status 2 testing release v4.3 testing commit 6a13feb9c82803e2b815eca72fa7a9f5561d7861 with gcc (GCC) 5.5.0 failed to run ["make" "bzImage" "-j" "64" "CC=/syzkaller/bisect_bin/gcc-5.5.0/bin/gcc"]: exit status 2 testing release v4.2 testing commit 64291f7db5bd8150a74ad2036f1037e6a0428df2 with gcc (GCC) 5.5.0 failed to run ["make" "bzImage" "-j" "64" "CC=/syzkaller/bisect_bin/gcc-5.5.0/bin/gcc"]: exit status 2 testing release v4.1 testing commit b953c0d234bc72e8489d3bf51a276c5c4ec85345 with gcc (GCC) 5.5.0 failed to run ["make" "bzImage" "-j" "64" "CC=/syzkaller/bisect_bin/gcc-5.5.0/bin/gcc"]: exit status 2 revisions tested: 22, total time: 2h11m42.743149562s (build: 1h14m6.782193043s, test: 49m51.625215445s) the crash already happened on the oldest tested release crash: KASAN: use-after-free Read in rdma_listen IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready 8021q: adding VLAN 0 to HW filter on device batadv0 ================================================================== BUG: KASAN: use-after-free in __list_add_valid+0x8f/0xb0 lib/list_debug.c:26 Read of size 8 at addr ffff880106d43418 by task syz-executor.1/7183 CPU: 0 PID: 7183 Comm: syz-executor.1 Not tainted 4.12.0 #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x145/0x1f0 lib/dump_stack.c:52 print_address_description.cold.6+0x9/0x1c9 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report.cold.7+0x121/0x2da mm/kasan/report.c:408 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429 __list_add_valid+0x8f/0xb0 lib/list_debug.c:26 __list_add include/linux/list.h:59 [inline] list_add_tail include/linux/list.h:92 [inline] cma_listen_on_all drivers/infiniband/core/cma.c:2289 [inline] rdma_listen+0x5bc/0x9b0 drivers/infiniband/core/cma.c:3300 ucma_listen+0x168/0x1f0 drivers/infiniband/core/ucma.c:1061 ucma_write+0x288/0x3f0 drivers/infiniband/core/ucma.c:1624 __vfs_write+0xdc/0xb60 fs/read_write.c:508 vfs_write+0x150/0x4f0 fs/read_write.c:558 SYSC_write fs/read_write.c:605 [inline] SyS_write+0xef/0x240 fs/read_write.c:597 entry_SYSCALL_64_fastpath+0x23/0xc2 RIP: 0033:0x458209 RSP: 002b:00007f3289963c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458209 RDX: 0000000000000010 RSI: 00000000200001c0 RDI: 0000000000000003 RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000073bf0c R13: 00007ffd9b9269cf R14: 00007f32899649c0 R15: 000000000073bf0c Allocated by task 7178: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x43/0xd0 mm/kasan/kasan.c:513 set_track mm/kasan/kasan.c:525 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:617 kmem_cache_alloc_trace+0x14b/0x7a0 mm/slab.c:3635 kmalloc include/linux/slab.h:492 [inline] kzalloc include/linux/slab.h:665 [inline] rdma_create_id+0xca/0x680 drivers/infiniband/core/cma.c:794 ucma_create_id+0x312/0x630 drivers/infiniband/core/ucma.c:477 ucma_write+0x288/0x3f0 drivers/infiniband/core/ucma.c:1624 __vfs_write+0xdc/0xb60 fs/read_write.c:508 vfs_write+0x150/0x4f0 fs/read_write.c:558 SYSC_write fs/read_write.c:605 [inline] SyS_write+0xef/0x240 fs/read_write.c:597 entry_SYSCALL_64_fastpath+0x23/0xc2 Freed by task 7170: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x43/0xd0 mm/kasan/kasan.c:513 set_track mm/kasan/kasan.c:525 [inline] kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:590 __cache_free mm/slab.c:3511 [inline] kfree+0xcc/0x270 mm/slab.c:3828 rdma_destroy_id+0x773/0xd60 drivers/infiniband/core/cma.c:1695 ucma_close+0xf0/0x2d0 drivers/infiniband/core/ucma.c:1703 __fput+0x2cf/0x900 fs/file_table.c:209 ____fput+0x9/0x10 fs/file_table.c:245 task_work_run+0x14e/0x230 kernel/task_work.c:116 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x216/0x280 arch/x86/entry/common.c:161 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] syscall_return_slowpath+0x2cb/0x360 arch/x86/entry/common.c:263 entry_SYSCALL_64_fastpath+0xc0/0xc2 The buggy address belongs to the object at ffff880106d43240 which belongs to the cache kmalloc-1024 of size 1024 The buggy address is located 472 bytes inside of 1024-byte region [ffff880106d43240, ffff880106d43640) The buggy address belongs to the page: page:ffffea00041b5080 count:1 mapcount:0 mapping:ffff880106d42040 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffff880106d42040 0000000000000000 0000000100000007 raw: ffffea000478e620 ffffea0004559120 ffff88012bc00ac0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff880106d43300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff880106d43380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff880106d43400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff880106d43480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff880106d43500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================