bisecting fixing commit since f6e27dbb1afabcba436e346d6aa88a592a1436bb building syzkaller on c68252d2244822a3ef8ae391be50481368176448 testing commit f6e27dbb1afabcba436e346d6aa88a592a1436bb with gcc (GCC) 8.1.0 kernel signature: 62a6ed5dd85057106271500e40c81eaf5e68ba84 run #0: crashed: KASAN: use-after-free Write in padata_parallel_worker run #1: crashed: BUG: unable to handle kernel paging request in corrupted run #2: crashed: BUG: unable to handle kernel paging request in corrupted 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: BUG: unable to handle kernel run #7: crashed: KASAN: use-after-free Write in padata_parallel_worker run #8: crashed: BUG: unable to handle kernel run #9: crashed: KASAN: use-after-free Write in padata_parallel_worker testing current HEAD a844dc4c544291470aa69edbe2434b040794e269 testing commit a844dc4c544291470aa69edbe2434b040794e269 with gcc (GCC) 8.1.0 kernel signature: 496041939fb0ecf73ca4a519e3e2067049b4e967 run #0: crashed: KASAN: use-after-free Write in padata_parallel_worker run #1: crashed: BUG: unable to handle kernel 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 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 revisions tested: 2, total time: 23m52.205915597s (build: 16m32.682862281s, test: 6m41.97484358s) the crash still happens on HEAD commit msg: Linux 4.14.158 crash: KASAN: use-after-free Write in padata_parallel_worker 8021q: adding VLAN 0 to HW filter on device bond0 IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_team: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready ================================================================== IPv6: ADDRCONF(NETDEV_UP): veth0: link is not 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:74 IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready Write of size 8 at addr ffff88809cc5e918 by task kworker/0:3/6761 CPU: 0 PID: 6761 Comm: kworker/0:3 Not tainted 4.14.158-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): veth0: link is not ready IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready print_address_description.cold.7+0x9/0x1c9 mm/kasan/report.c:252 8021q: adding VLAN 0 to HW filter on device batadv0 kobject: 'vlan0' (ffff88808b895a00): kobject_add_internal: parent: 'mesh', set: '' 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:74 BUG: unable to handle kernel paging request process_one_work+0x79e/0x16c0 kernel/workqueue.c:2114 at ffffffffffffffc8 IP: crypto_aead_encrypt include/crypto/aead.h:330 [inline] IP: pcrypt_aead_enc+0x7b/0xf0 crypto/pcrypt.c:143 worker_thread+0xcc/0xee0 kernel/workqueue.c:2248 PGD 786d067 kthread+0x338/0x400 kernel/kthread.c:232 P4D 786d067 PUD 786f067 PMD 0 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Oops: 0000 [#1] PREEMPT SMP KASAN Allocated by task 6780: Modules linked in: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 CPU: 1 PID: 18 Comm: kworker/1:0 Not tainted 4.14.158-syzkaller #0 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:551 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 __do_kmalloc mm/slab.c:3720 [inline] __kmalloc+0x15b/0x7b0 mm/slab.c:3729 Workqueue: pencrypt padata_parallel_worker 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 task: ffff8880a9d5c4c0 task.stack: ffff8880a9d68000 inet_sendmsg+0x108/0x440 net/ipv4/af_inet.c:762 RIP: 0010:crypto_aead_encrypt include/crypto/aead.h:330 [inline] RIP: 0010:pcrypt_aead_enc+0x7b/0xf0 crypto/pcrypt.c:143 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:656 RSP: 0018:ffff8880a9d6fc90 EFLAGS: 00010246 SYSC_sendto+0x1e3/0x2c0 net/socket.c:1763 SyS_sendto+0x9/0x10 net/socket.c:1731 RAX: dffffc0000000000 RBX: ffff88809dfe8d50 RCX: ffffffff82b05b4e do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 RDX: 1ffffffffffffff9 RSI: 0000000000000008 RDI: ffff88809dfe8d88 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RBP: ffff8880a9d6fcb0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000050 R11: ffff8880a9d5c4c0 R12: 0000000000000000 Freed by task 6780: R13: ffff88809dfe8d88 R14: ffff8880a9d6fcf8 R15: 1ffff110153adf9b save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 FS: 0000000000000000(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524 CR2: ffffffffffffffc8 CR3: 00000000921c5000 CR4: 00000000001406e0 __cache_free mm/slab.c:3496 [inline] kfree+0xcc/0x270 mm/slab.c:3815 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 tls_push_record+0xd32/0x14c0 net/tls/tls_sw.c:293 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 tls_sw_sendmsg+0x90b/0x10a0 net/tls/tls_sw.c:457 Call Trace: inet_sendmsg+0x108/0x440 net/ipv4/af_inet.c:762 padata_parallel_worker+0x24e/0x420 kernel/padata.c:85 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:656 SYSC_sendto+0x1e3/0x2c0 net/socket.c:1763 process_one_work+0x79e/0x16c0 kernel/workqueue.c:2114 SyS_sendto+0x9/0x10 net/socket.c:1731 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 worker_thread+0xcc/0xee0 kernel/workqueue.c:2248 entry_SYSCALL_64_after_hwframe+0x42/0xb7 kthread+0x338/0x400 kernel/kthread.c:232 The buggy address belongs to the object at ffff88809cc5e8c0 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 88 bytes inside of 256-byte region [ffff88809cc5e8c0, ffff88809cc5e9c0) ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 The buggy address belongs to the page: Code: page:ffffea0002731780 count:1 mapcount:0 mapping:ffff88809cc5e000 index:0x0 00 0f flags: 0x1fffc0000000100(slab) 85 raw: 01fffc0000000100 ffff88809cc5e000 0000000000000000 000000010000000c 82 raw: ffffea000277e520 ffffea00028066a0 ffff8880aa8007c0 0000000000000000 00 page dumped because: kasan: bad access detected 00 00 48 Memory state around the buggy address: b8 ffff88809cc5e800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 00 ffff88809cc5e880: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb 00 >ffff88809cc5e900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 00 ^ 00 ffff88809cc5e980: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc 00 ffff88809cc5ea00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc ================================================================== ff