bisecting fixing commit since e0f8b8a65a473a8baa439cf865a694bbeb83fe90 building syzkaller on 06150bf1b39b70e521560bc943ac19b281903ebc testing commit e0f8b8a65a473a8baa439cf865a694bbeb83fe90 with gcc (GCC) 8.1.0 kernel signature: bb00242375665e3997b9d030f82ba9742d61cb817e66dba0d41d0c109adf90a9 run #0: crashed: BUG: unable to handle kernel run #1: crashed: KASAN: use-after-free Write in padata_parallel_worker run #2: crashed: KASAN: use-after-free Write in padata_parallel_worker run #3: crashed: KASAN: use-after-free Write in padata_parallel_worker run #4: crashed: KASAN: use-after-free Write in padata_parallel_worker run #5: crashed: KASAN: use-after-free Write in padata_parallel_worker run #6: crashed: KASAN: use-after-free Write in padata_parallel_worker run #7: crashed: BUG: unable to handle kernel NULL pointer dereference in pcrypt_aead_serial run #8: crashed: KASAN: use-after-free Write in padata_serial_worker run #9: crashed: BUG: unable to handle kernel NULL pointer dereference in pcrypt_aead_serial testing current HEAD 4f68020fef1c6cf1b680ffb6481ac41379283ea3 testing commit 4f68020fef1c6cf1b680ffb6481ac41379283ea3 with gcc (GCC) 8.1.0 kernel signature: 051f8d576273e6fb4456063ad55a5b7361aaf96fdef8d6cc5fa0ce6c8a2b8f0a run #0: crashed: BUG: unable to handle kernel paging request in corrupted run #1: crashed: KASAN: use-after-free Write in padata_parallel_worker run #2: crashed: KASAN: use-after-free Write in padata_parallel_worker run #3: crashed: KASAN: use-after-free Write in padata_parallel_worker run #4: crashed: BUG: unable to handle kernel NULL pointer dereference in pcrypt_aead_serial run #5: crashed: BUG: unable to handle kernel run #6: crashed: KASAN: use-after-free Write in padata_parallel_worker run #7: crashed: BUG: unable to handle kernel run #8: crashed: KASAN: use-after-free Write in padata_parallel_worker run #9: crashed: KASAN: use-after-free in padata_parallel_worker revisions tested: 2, total time: 23m29.227592523s (build: 16m32.858460154s, test: 5m59.257172193s) the crash still happens on HEAD commit msg: Linux 4.14.182 crash: KASAN: use-after-free in padata_parallel_worker batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1 TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! ================================================================== TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. BUG: KASAN: use-after-free in list_replace include/linux/list.h:141 [inline] BUG: KASAN: use-after-free in list_replace_init include/linux/list.h:149 [inline] BUG: KASAN: use-after-free in padata_parallel_worker+0x377/0x420 kernel/padata.c:76 BUG: unable to handle kernel Write of size 8 at addr ffff8880a451e718 by task kworker/1:0/18 paging request at ffffffffffffffc8 CPU: 1 PID: 18 Comm: kworker/1:0 Not tainted 4.14.182-syzkaller #0 IP: crypto_aead_encrypt include/crypto/aead.h:330 [inline] IP: pcrypt_aead_enc+0x77/0xf0 crypto/pcrypt.c:142 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 PGD 7e6d067 Workqueue: pencrypt padata_parallel_worker P4D 7e6d067 PUD 7e6f067 Call Trace: PMD 0 __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xf7/0x13b lib/dump_stack.c:58 Oops: 0000 [#1] PREEMPT SMP KASAN Modules linked in: print_address_description.cold.7+0x9/0x1c9 mm/kasan/report.c:252 CPU: 0 PID: 3618 Comm: kworker/0:2 Not tainted 4.14.182-syzkaller #0 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report.cold.8+0x11a/0x2d3 mm/kasan/report.c:409 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 __asan_report_store8_noabort+0x17/0x20 mm/kasan/report.c:435 Workqueue: pencrypt padata_parallel_worker list_replace include/linux/list.h:141 [inline] list_replace_init include/linux/list.h:149 [inline] padata_parallel_worker+0x377/0x420 kernel/padata.c:76 task: ffff8880930641c0 task.stack: ffff888093068000 RIP: 0010:crypto_aead_encrypt include/crypto/aead.h:330 [inline] RIP: 0010:pcrypt_aead_enc+0x77/0xf0 crypto/pcrypt.c:142 process_one_work+0x79e/0x16c0 kernel/workqueue.c:2116 RSP: 0018:ffff88809306fc90 EFLAGS: 00010246 worker_thread+0xcc/0xee0 kernel/workqueue.c:2250 RAX: dffffc0000000000 RBX: ffff8880a451e850 RCX: ffffffff82e52102 kthread+0x338/0x400 kernel/kthread.c:232 RDX: 1ffffffffffffff9 RSI: 0000000000000008 RDI: ffff8880a451e890 RBP: ffff88809306fcb0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000050 R11: ffff8880930641c0 R12: 0000000000000000 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 R13: ffff8880a451e890 R14: ffff88809306fcf8 R15: 1ffff1101260df9b FS: 0000000000000000(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000 Allocated by task 7760: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 CR2: ffffffffffffffc8 CR3: 0000000007e6a000 CR4: 00000000001406f0 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:551 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 __do_kmalloc mm/slab.c:3720 [inline] __kmalloc+0x15b/0x7b0 mm/slab.c:3729 Call Trace: kmalloc include/linux/slab.h:493 [inline] kzalloc include/linux/slab.h:661 [inline] tls_push_record+0xf6/0x14c0 net/tls/tls_sw.c:250 padata_parallel_worker+0x24b/0x420 kernel/padata.c:87 tls_sw_push_pending_record+0xe/0x10 net/tls/tls_sw.c:299 tls_push_pending_closed_record+0xc5/0x120 net/tls/tls_main.c:205 tls_complete_pending_work include/net/tls.h:159 [inline] tls_sk_proto_close+0x5fa/0x870 net/tls/tls_main.c:269 process_one_work+0x79e/0x16c0 kernel/workqueue.c:2116 inet_release+0xd9/0x1c0 net/ipv4/af_inet.c:425 inet6_release+0x46/0x60 net/ipv6/af_inet6.c:450 worker_thread+0xcc/0xee0 kernel/workqueue.c:2250 __sock_release+0xc2/0x2a0 net/socket.c:602 kthread+0x338/0x400 kernel/kthread.c:232 sock_close+0x10/0x20 net/socket.c:1139 __fput+0x232/0x750 fs/file_table.c:210 ____fput+0x9/0x10 fs/file_table.c:244 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 task_work_run+0xe5/0x170 kernel/task_work.c:113 Code: tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x16a/0x1b0 arch/x86/entry/common.c:164 03 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x416/0x5b0 arch/x86/entry/common.c:297 80 entry_SYSCALL_64_after_hwframe+0x46/0xbb 3c 02 Freed by task 7760: 00 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 75 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 7a set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524 48 __cache_free mm/slab.c:3496 [inline] kfree+0xcc/0x270 mm/slab.c:3815 b8 tls_push_record+0xd32/0x14c0 net/tls/tls_sw.c:293 00 tls_sw_push_pending_record+0xe/0x10 net/tls/tls_sw.c:299 00 tls_push_pending_closed_record+0xc5/0x120 net/tls/tls_main.c:205 00 tls_complete_pending_work include/net/tls.h:159 [inline] tls_sk_proto_close+0x5fa/0x870 net/tls/tls_main.c:269 00 inet_release+0xd9/0x1c0 net/ipv4/af_inet.c:425 00 inet6_release+0x46/0x60 net/ipv6/af_inet6.c:450 fc __sock_release+0xc2/0x2a0 net/socket.c:602 ff sock_close+0x10/0x20 net/socket.c:1139 df __fput+0x232/0x750 fs/file_table.c:210 4d ____fput+0x9/0x10 fs/file_table.c:244 8b task_work_run+0xe5/0x170 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x16a/0x1b0 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x416/0x5b0 arch/x86/entry/common.c:297 64 entry_SYSCALL_64_after_hwframe+0x46/0xbb 24 38 The buggy address belongs to the object at ffff8880a451e6c0 which belongs to the cache kmalloc-256 of size 256 49 The buggy address is located 88 bytes inside of 256-byte region [ffff8880a451e6c0, ffff8880a451e7c0) 8d The buggy address belongs to the page: 7c page:ffffea0002914780 count:1 mapcount:0 mapping:ffff8880a451e080 index:0x0 24 c8 flags: 0xfffe0000000100(slab) 48 raw: 00fffe0000000100 ffff8880a451e080 0000000000000000 000000010000000c 89 raw: ffffea000224fc20 ffff8880aa801648 ffff8880aa8007c0 0000000000000000 fa page dumped because: kasan: bad access detected 48 c1 Memory state around the buggy address: ea ffff8880a451e600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc 03 ffff8880a451e680: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb 80 >ffff8880a451e700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 3c ^ 02 ffff8880a451e780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc 00 ffff8880a451e800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 75 ================================================================== 52