bisecting fixing commit since 414510bc00a5fc954d8340c170083f518d09aa55 building syzkaller on a60cb4cd840ce786236a00480e8bb1025e0c5fef testing commit 414510bc00a5fc954d8340c170083f518d09aa55 with gcc (GCC) 8.1.0 kernel signature: b6b8545b22c6765829bf52408744e1f8950afabe266a6324573430814c473435 run #0: crashed: KASAN: use-after-free Write in padata_parallel_worker 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 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: KASAN: use-after-free Write in padata_parallel_worker run #8: crashed: BUG: unable to handle kernel paging request in corrupted run #9: crashed: KASAN: use-after-free Write in padata_parallel_worker testing current HEAD d71f695ce745df9544a85d8a762f16d72e72df00 testing commit d71f695ce745df9544a85d8a762f16d72e72df00 with gcc (GCC) 8.1.0 kernel signature: 561ef790af5d97499bde174b1a2785d21762563b09238e52dc78cac10cac1e18 run #0: crashed: KASAN: use-after-free Write in padata_parallel_worker run #1: crashed: KASAN: use-after-free Write in padata_serial_worker run #2: crashed: BUG: unable to handle kernel run #3: crashed: KASAN: use-after-free Write in padata_parallel_worker run #4: crashed: KASAN: use-after-free in padata_parallel_worker run #5: crashed: BUG: unable to handle kernel paging request in corrupted run #6: crashed: KASAN: use-after-free Write in padata_parallel_worker run #7: crashed: BUG: unable to handle kernel paging request in corrupted run #8: crashed: KASAN: use-after-free in padata_parallel_worker run #9: crashed: KASAN: use-after-free Write in padata_parallel_worker revisions tested: 2, total time: 26m23.008636604s (build: 18m48.667938845s, test: 6m4.342433596s) the crash still happens on HEAD commit msg: Linux 4.14.179 crash: KASAN: use-after-free Write in padata_parallel_worker IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready ================================================================== IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready 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+0x37a/0x420 kernel/padata.c:76 Write of size 8 at addr ffff888096884058 by task kworker/0:3/6950 CPU: 0 PID: 6950 Comm: kworker/0:3 Not tainted 4.14.179-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: pencrypt padata_parallel_worker Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xf7/0x13b lib/dump_stack.c:58 IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready print_address_description.cold.7+0x9/0x1c9 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report.cold.8+0x11a/0x2d3 mm/kasan/report.c:409 __asan_report_store8_noabort+0x17/0x20 mm/kasan/report.c:435 list_replace include/linux/list.h:141 [inline] list_replace_init include/linux/list.h:149 [inline] padata_parallel_worker+0x37a/0x420 kernel/padata.c:76 IPv6: ADDRCONF(NETDEV_UP): veth0_to_hsr: link is not ready process_one_work+0x79e/0x16c0 kernel/workqueue.c:2116 worker_thread+0xcc/0xee0 kernel/workqueue.c:2250 kthread+0x338/0x400 kernel/kthread.c:232 IPv6: ADDRCONF(NETDEV_UP): veth1_to_hsr: link is not ready ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network Allocated by task 7127: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:551 __do_kmalloc mm/slab.c:3720 [inline] __kmalloc+0x15b/0x7b0 mm/slab.c:3729 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 tls_sw_sendmsg+0x90b/0x10a0 net/tls/tls_sw.c:457 inet_sendmsg+0x108/0x440 net/ipv4/af_inet.c:762 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:656 SYSC_sendto+0x1e3/0x2c0 net/socket.c:1763 SyS_sendto+0x9/0x10 net/socket.c:1731 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 7127: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xcc/0x270 mm/slab.c:3815 tls_push_record+0xd32/0x14c0 net/tls/tls_sw.c:293 tls_sw_sendmsg+0x90b/0x10a0 net/tls/tls_sw.c:457 inet_sendmsg+0x108/0x440 net/ipv4/af_inet.c:762 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:656 SYSC_sendto+0x1e3/0x2c0 net/socket.c:1763 SyS_sendto+0x9/0x10 net/socket.c:1731 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready The buggy address belongs to the object at ffff888096884000 which belongs to the cache kmalloc-256 of size 256 IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready The buggy address is located 88 bytes inside of 256-byte region [ffff888096884000, ffff888096884100) 8021q: adding VLAN 0 to HW filter on device batadv0 The buggy address belongs to the page: BUG: unable to handle kernel page:ffffea00025a2100 count:1 mapcount:0 mapping:ffff888096884000 index:0x0 paging request at ffffffffffffffc8 flags: 0x1fffc0000000100(slab) IP: crypto_aead_encrypt include/crypto/aead.h:330 [inline] IP: pcrypt_aead_enc+0x7b/0xf0 crypto/pcrypt.c:142 raw: 01fffc0000000100 ffff888096884000 0000000000000000 000000010000000c PGD 786d067 raw: ffffea00025b6fe0 ffffea000252c320 ffff8880aa8007c0 0000000000000000 P4D 786d067 page dumped because: kasan: bad access detected PUD 786f067 PMD 0 Memory state around the buggy address: ffff888096883f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc Oops: 0000 [#1] PREEMPT SMP KASAN ffff888096883f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc Modules linked in: >ffff888096884000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ CPU: 1 PID: 23 Comm: kworker/1:1 Not tainted 4.14.179-syzkaller #0 ffff888096884080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff888096884100: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 Workqueue: pencrypt padata_parallel_worker ================================================================== task: ffff8880a9e42600 task.stack: ffff8880a9e50000