bisecting fixing commit since 27ce4f2a6817e38ca74c643d47a96359f6cc0c1c building syzkaller on 1bf9a662c66aa432ff2fe3bf2562578cef626c09 testing commit 27ce4f2a6817e38ca74c643d47a96359f6cc0c1c with gcc (GCC) 8.4.1 20210217 kernel signature: 0fef034eb2baf163ef824b5cd7705b16fa1f5822c113a3a2edff32993675c373 run #0: crashed: KASAN: use-after-free Write in padata_parallel_worker run #1: crashed: KASAN: use-after-free Read in padata_do_parallel run #2: crashed: KASAN: use-after-free in padata_parallel_worker run #3: crashed: BUG: unable to handle kernel NULL pointer dereference in pcrypt_aead_serial run #4: crashed: KASAN: use-after-free Read in padata_do_parallel run #5: crashed: KASAN: use-after-free Read in padata_do_parallel run #6: crashed: KASAN: use-after-free Read in padata_do_parallel 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 Read in padata_do_parallel run #10: crashed: KASAN: use-after-free Write in padata_parallel_worker run #11: crashed: KASAN: use-after-free Read in padata_do_parallel run #12: crashed: KASAN: use-after-free Write in padata_parallel_worker run #13: crashed: KASAN: use-after-free Read in padata_do_parallel run #14: crashed: KASAN: use-after-free Read in padata_do_parallel run #15: crashed: KASAN: use-after-free Write in padata_parallel_worker run #16: crashed: KASAN: use-after-free Write in padata_parallel_worker run #17: crashed: KASAN: use-after-free Write in padata_parallel_worker run #18: crashed: BUG: unable to handle kernel NULL pointer dereference in pcrypt_aead_serial run #19: crashed: BUG: unable to handle kernel NULL pointer dereference in pcrypt_aead_serial testing current HEAD 7d7d1c0ab3eb7c8d8f63a126535018007823b207 testing commit 7d7d1c0ab3eb7c8d8f63a126535018007823b207 with gcc (GCC) 8.4.1 20210217 kernel signature: c15a1f9f1607eedfc008f7f04dd296f610f131c288394c9d5f9076583e533fb8 run #0: crashed: KASAN: use-after-free Read in padata_do_parallel run #1: crashed: KASAN: use-after-free Read in padata_do_parallel run #2: crashed: KASAN: use-after-free Read in corrupted run #3: crashed: KASAN: use-after-free Write in padata_parallel_worker run #4: crashed: KASAN: use-after-free Read in padata_do_parallel run #5: crashed: KASAN: use-after-free Read in padata_do_parallel run #6: crashed: BUG: unable to handle kernel NULL pointer dereference in pcrypt_aead_serial run #7: crashed: BUG: unable to handle kernel run #8: crashed: KASAN: use-after-free Read in padata_do_parallel run #9: crashed: KASAN: use-after-free Write in padata_parallel_worker revisions tested: 2, total time: 25m39.973530287s (build: 18m31.601093808s, test: 6m31.214227616s) the crash still happens on HEAD commit msg: Linux 4.14.232 crash: KASAN: use-after-free Write in padata_parallel_worker IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: 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+0x370/0x3e0 kernel/padata.c:76 Write of size 8 at addr ffff8881f2c0dc58 by task kworker/0:0/3 CPU: 0 PID: 3 Comm: kworker/0:0 Not tainted 4.14.232-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+0x14b/0x1e7 lib/dump_stack.c:58 print_address_description.cold.6+0x9/0x1ca mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold.7+0x11a/0x2d3 mm/kasan/report.c:393 __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+0x370/0x3e0 kernel/padata.c:76 process_one_work+0x74f/0x1620 kernel/workqueue.c:2116 worker_thread+0xcc/0xee0 kernel/workqueue.c:2250 kthread+0x338/0x400 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Allocated by task 9201: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc.part.1+0x62/0xf0 mm/kasan/kasan.c:551 kasan_kmalloc+0xaf/0xc0 mm/kasan/kasan.c:536 __do_kmalloc mm/slab.c:3720 [inline] __kmalloc+0x15d/0x410 mm/slab.c:3729 kmalloc include/linux/slab.h:493 [inline] kzalloc include/linux/slab.h:661 [inline] tls_push_record+0xf6/0x1540 net/tls/tls_sw.c:250 tls_sw_sendpage+0x447/0xb90 net/tls/tls_sw.c:617 inet_sendpage+0x122/0x600 net/ipv4/af_inet.c:779 kernel_sendpage+0x60/0xd0 net/socket.c:3407 sock_sendpage+0x6d/0xd0 net/socket.c:871 pipe_to_sendpage+0x206/0x420 fs/splice.c:451 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x2cb/0x720 fs/splice.c:626 splice_from_pipe+0xb5/0x110 fs/splice.c:661 generic_splice_sendpage+0x10/0x20 fs/splice.c:832 do_splice_from fs/splice.c:851 [inline] direct_splice_actor+0x104/0x1c0 fs/splice.c:1018 splice_direct_to_actor+0x27c/0x750 fs/splice.c:973 do_splice_direct+0x144/0x250 fs/splice.c:1061 do_sendfile+0x46c/0xcf0 fs/read_write.c:1441 SYSC_sendfile64 fs/read_write.c:1502 [inline] SyS_sendfile64+0xf5/0x110 fs/read_write.c:1488 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb Freed by task 9201: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xab/0x190 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xcc/0x270 mm/slab.c:3815 tls_push_record+0xd75/0x1540 net/tls/tls_sw.c:293 tls_sw_sendpage+0x447/0xb90 net/tls/tls_sw.c:617 inet_sendpage+0x122/0x600 net/ipv4/af_inet.c:779 kernel_sendpage+0x60/0xd0 net/socket.c:3407 sock_sendpage+0x6d/0xd0 net/socket.c:871 pipe_to_sendpage+0x206/0x420 fs/splice.c:451 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x2cb/0x720 fs/splice.c:626 splice_from_pipe+0xb5/0x110 fs/splice.c:661 generic_splice_sendpage+0x10/0x20 fs/splice.c:832 do_splice_from fs/splice.c:851 [inline] direct_splice_actor+0x104/0x1c0 fs/splice.c:1018 splice_direct_to_actor+0x27c/0x750 fs/splice.c:973 do_splice_direct+0x144/0x250 fs/splice.c:1061 do_sendfile+0x46c/0xcf0 fs/read_write.c:1441 SYSC_sendfile64 fs/read_write.c:1502 [inline] SyS_sendfile64+0xf5/0x110 fs/read_write.c:1488 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb The buggy address belongs to the object at ffff8881f2c0dc00 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 88 bytes inside of 256-byte region [ffff8881f2c0dc00, ffff8881f2c0dd00) The buggy address belongs to the page: page:ffffea0007cb0340 count:1 mapcount:0 mapping:ffff8881f2c0d0c0 index:0x0 flags: 0x17ff00000000100(slab) raw: 017ff00000000100 ffff8881f2c0d0c0 0000000000000000 000000010000000c raw: ffffea0007caf8e0 ffffea0007caa0e0 ffff8881f60007c0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881f2c0db00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881f2c0db80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8881f2c0dc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881f2c0dc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881f2c0dd00: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ================================================================== IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready BUG: unable to handle kernel paging request at ffffffffffffffc8 ieee80211 phy14: mac80211_hwsim_bss_info_changed(changed=0x10 vif->addr=02:00:00:00:0e:00) IP: crypto_aead_encrypt include/crypto/aead.h:330 [inline] IP: pcrypt_aead_enc+0x77/0xf0 crypto/pcrypt.c:142 PGD 8e6b067 P4D 8e6b067 PUD 8e6d067 PMD 0 Oops: 0000 [#1] PREEMPT SMP KASAN Modules linked in: CPU: 0 PID: 3 Comm: kworker/0:0 Tainted: G B 4.14.232-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: pencrypt padata_parallel_worker task: ffff8881f53100c0 task.stack: ffff8881f5318000 RIP: 0010:crypto_aead_encrypt include/crypto/aead.h:330 [inline] RIP: 0010:pcrypt_aead_enc+0x77/0xf0 crypto/pcrypt.c:142 ieee80211 phy14: HT: op_mode=0xb RSP: 0018:ffff8881f531fc90 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff8881e6dc2bd0 RCX: ffffffff82f95cb2 RDX: 1ffffffffffffff9 RSI: 0000000000000008 RDI: ffff8881e6dc2c10 RBP: ffff8881f531fcb0 R08: 0000000000000000 R09: 0000000000000000 R10: ffffed1047fff001 R11: ffff8881f53100c0 R12: 0000000000000000 R13: ffff8881e6dc2c10 R14: ffff8881f531fcf8 R15: 1ffff1103ea63f9b FS: 0000000000000000(0000) GS:ffff8881f6400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 CR2: ffffffffffffffc8 CR3: 0000000008e6a005 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: padata_parallel_worker+0x229/0x3e0 kernel/padata.c:87 wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 process_one_work+0x74f/0x1620 kernel/workqueue.c:2116 worker_thread+0xcc/0xee0 kernel/workqueue.c:2250 kthread+0x338/0x400 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Code: 03 80 3c 02 00 75 7a 48 b8 00 00 00 00 00 fc ff df 4d 8b 64 24 38 49 8d 7c 24 c8 48 89 fa 48 c1 ea 03 80 3c 02 00 75 52 4c 89 ef <41> ff 54 24 c8 48 8d 7b 20 48 ba 00 00 00 00 00 fc ff df 48 89 RIP: crypto_aead_encrypt include/crypto/aead.h:330 [inline] RSP: ffff8881f531fc90 RIP: pcrypt_aead_enc+0x77/0xf0 crypto/pcrypt.c:142 RSP: ffff8881f531fc90 CR2: ffffffffffffffc8 ---[ end trace ff190fcf5c7f5aea ]---