bisecting cause commit starting from eb6cf9f8cb9dfacf6679f9d6c72aaf568a027edf building syzkaller on 7624ddd6d82230be5d9df0f74b1b98b761eed677 testing commit eb6cf9f8cb9dfacf6679f9d6c72aaf568a027edf with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #1: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #2: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #3: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #4: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK testing release v4.19 testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #1: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #2: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #3: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #4: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #5: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #6: OK run #7: OK run #8: OK run #9: OK testing release v4.18 testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #1: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK testing release v4.17 testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0 all runs: OK # git bisect start 94710cac0ef4ee177a63b5227664b38c95bbf703 29dcea88779c856c7dc92040a0c01233263101d4 Bisecting: 7032 revisions left to test after this (roughly 13 steps) [3036bc45364f98515a2c446d7fac2c34dcfbeff4] Merge tag 'media/v4.18-2' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media testing commit 3036bc45364f98515a2c446d7fac2c34dcfbeff4 with gcc (GCC) 8.1.0 run #0: OK run #1: OK run #2: OK run #3: OK run #4: OK run #5: boot failed: KASAN: use-after-free Write in call_usermodehelper_exec_work run #6: boot failed: KASAN: use-after-free Write in call_usermodehelper_exec_work run #7: boot failed: KASAN: use-after-free Write in call_usermodehelper_exec_work run #8: boot failed: KASAN: use-after-free Write in call_usermodehelper_exec_work run #9: boot failed: KASAN: use-after-free Write in call_usermodehelper_exec_work # git bisect good 3036bc45364f98515a2c446d7fac2c34dcfbeff4 Bisecting: 3348 revisions left to test after this (roughly 12 steps) [721afaa2aeb860067decdddadc84ed16f42f2048] Merge tag 'armsoc-dt' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc testing commit 721afaa2aeb860067decdddadc84ed16f42f2048 with gcc (GCC) 8.1.0 all runs: OK # git bisect good 721afaa2aeb860067decdddadc84ed16f42f2048 Bisecting: 1674 revisions left to test after this (roughly 11 steps) [7b72717a20bba8bdd01b14c0460be7d15061cd6b] iw_cxgb4: correctly enforce the max reg_mr depth testing commit 7b72717a20bba8bdd01b14c0460be7d15061cd6b with gcc (GCC) 8.1.0 all runs: OK # git bisect good 7b72717a20bba8bdd01b14c0460be7d15061cd6b Bisecting: 837 revisions left to test after this (roughly 10 steps) [47f7dc4b845a9fe60c53b84b8c88cf14efd0de7f] Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm testing commit 47f7dc4b845a9fe60c53b84b8c88cf14efd0de7f with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad 47f7dc4b845a9fe60c53b84b8c88cf14efd0de7f Bisecting: 414 revisions left to test after this (roughly 9 steps) [4e33d7d47943aaa84a5904472cf2f9c6d6b0a6ca] Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net testing commit 4e33d7d47943aaa84a5904472cf2f9c6d6b0a6ca with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #1: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad 4e33d7d47943aaa84a5904472cf2f9c6d6b0a6ca Bisecting: 202 revisions left to test after this (roughly 8 steps) [d7d5388679312b7a7b6377e38e2b8fb06a82d84e] Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip testing commit d7d5388679312b7a7b6377e38e2b8fb06a82d84e with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #1: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad d7d5388679312b7a7b6377e38e2b8fb06a82d84e Bisecting: 114 revisions left to test after this (roughly 7 steps) [ea5f39f2f994e6fb8cb8d0304aa5f422ae3bbf83] Merge branch 'akpm' (patches from Andrew) testing commit ea5f39f2f994e6fb8cb8d0304aa5f422ae3bbf83 with gcc (GCC) 8.1.0 all runs: OK # git bisect good ea5f39f2f994e6fb8cb8d0304aa5f422ae3bbf83 Bisecting: 59 revisions left to test after this (roughly 6 steps) [48a3c64b4649b5b23a4ca756af93b4ee820ff883] Merge tag 'drm-fixes-2018-06-29' of git://anongit.freedesktop.org/drm/drm testing commit 48a3c64b4649b5b23a4ca756af93b4ee820ff883 with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #1: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad 48a3c64b4649b5b23a4ca756af93b4ee820ff883 Bisecting: 26 revisions left to test after this (roughly 5 steps) [90368a37fbbe76056db2b703c08903939a2a18dc] Merge tag 'printk-for-4.18-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk testing commit 90368a37fbbe76056db2b703c08903939a2a18dc with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad 90368a37fbbe76056db2b703c08903939a2a18dc Bisecting: 13 revisions left to test after this (roughly 4 steps) [c9a4c63888dbb79ce4d068ca1dd8b05bc3f156b1] ALSA: seq: Fix UBSAN warning at SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT ioctl testing commit c9a4c63888dbb79ce4d068ca1dd8b05bc3f156b1 with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #1: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad c9a4c63888dbb79ce4d068ca1dd8b05bc3f156b1 Bisecting: 6 revisions left to test after this (roughly 3 steps) [a57a46b93244a0a916b894d8b2ca2a6cfe1904d3] ALSA: hda/ca0132: Fix DMic data rate for Alienware M17x R4 testing commit a57a46b93244a0a916b894d8b2ca2a6cfe1904d3 with gcc (GCC) 8.1.0 all runs: OK # git bisect good a57a46b93244a0a916b894d8b2ca2a6cfe1904d3 Bisecting: 3 revisions left to test after this (roughly 2 steps) [9c4a665ed83462039461dd34282e22160fb447ca] ALSA: hda/ca0132: make array ca0132_alt_chmaps static testing commit 9c4a665ed83462039461dd34282e22160fb447ca with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad 9c4a665ed83462039461dd34282e22160fb447ca Bisecting: 0 revisions left to test after this (roughly 1 step) [57cb54e53bddb59f5f542ddd4b0bfe005d31a8d5] ALSA: hda - Force to link down at runtime suspend on ATI/AMD HDMI testing commit 57cb54e53bddb59f5f542ddd4b0bfe005d31a8d5 with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #1: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad 57cb54e53bddb59f5f542ddd4b0bfe005d31a8d5 Bisecting: 0 revisions left to test after this (roughly 0 steps) [f04684b4d85d6371126f476d3268ebf6a0bd57cf] ALSA: lx6464es: Missing error code in snd_lx6464es_create() testing commit f04684b4d85d6371126f476d3268ebf6a0bd57cf with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #1: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #2: crashed: KASAN: use-after-free Read in ccid_hc_tx_delete run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad f04684b4d85d6371126f476d3268ebf6a0bd57cf f04684b4d85d6371126f476d3268ebf6a0bd57cf is the first bad commit commit f04684b4d85d6371126f476d3268ebf6a0bd57cf Author: Dan Carpenter Date: Thu Jun 21 11:07:21 2018 +0300 ALSA: lx6464es: Missing error code in snd_lx6464es_create() We forgot to set the error code on this error path. Fixes: 4a23fc8cc068 ("ALSA: lx6464es: add error handling for pci_ioremap_bar") Signed-off-by: Dan Carpenter Signed-off-by: Takashi Iwai :040000 040000 2eeceec951b6934b476fc06fe8ef9127172d1001 4e23b19f645d8f017008380d748c7972e3230248 M sound revisions tested: 18, total time: 5h13m34.447888058s (build: 1h43m1.131090737s, test: 3h25m33.119978402s) first bad commit: f04684b4d85d6371126f476d3268ebf6a0bd57cf ALSA: lx6464es: Missing error code in snd_lx6464es_create() cc: ["alsa-devel@alsa-project.org" "dan.carpenter@oracle.com" "linux-kernel@vger.kernel.org" "perex@perex.cz" "tiwai@suse.com" "tiwai@suse.de"] crash: KASAN: use-after-free Read in ccid_hc_tx_delete ================================================================== BUG: KASAN: use-after-free in ccid_hc_tx_delete+0xd5/0xf0 net/dccp/ccid.c:188 Read of size 8 at addr ffff8801ba717800 by task syz-executor4/21627 CPU: 1 PID: 21627 Comm: syz-executor4 Not tainted 4.18.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x16e/0x22a lib/dump_stack.c:113 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.9+0x242/0x2fe mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 ccid_hc_tx_delete+0xd5/0xf0 net/dccp/ccid.c:188 dccp_sk_destruct+0x37/0x80 net/dccp/proto.c:181 __sk_destruct+0xf6/0xa00 net/core/sock.c:1573 __rcu_reclaim kernel/rcu/rcu.h:178 [inline] rcu_do_batch kernel/rcu/tree.c:2558 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2818 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2785 [inline] rcu_process_callbacks+0xe9f/0x1710 kernel/rcu/tree.c:2802 __do_softirq+0x308/0xb7b kernel/softirq.c:284 invoke_softirq kernel/softirq.c:364 [inline] irq_exit+0x19e/0x1f0 kernel/softirq.c:404 exiting_irq arch/x86/include/asm/apic.h:527 [inline] smp_apic_timer_interrupt+0x1b7/0x7e0 arch/x86/kernel/apic/apic.c:1052 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863 RIP: 0010:memset_erms+0xb/0x10 arch/x86/lib/memset_64.S:67 Code: 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 f3 aa <4c> 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01 01 01 RSP: 0018:ffff8801bd667528 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 RAX: 1ffff10037c21b00 RBX: ffffed0037c21b3d RCX: 0000000000000000 RDX: 000000000000001d RSI: 0000000000000000 RDI: ffffed0037c21b3d RBP: ffff8801bd667540 R08: 0000000000000068 R09: ffffed0037c21b20 R10: 000000002e8671ce R11: ffff8801dad23953 R12: 00000000000000e8 R13: ffff8801be10d900 R14: ffff8801be10d9e7 R15: ffff8801be10d9e7 kasan_kmalloc+0x4a/0xe0 mm/kasan/kasan.c:548 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x780 mm/slab.c:3554 skb_clone+0x19e/0x490 net/core/skbuff.c:1282 dccp_skb_entail+0x85/0xb0 net/dccp/output.c:37 dccp_connect+0x345/0x690 net/dccp/output.c:564 dccp_v6_connect+0x159c/0x1d00 net/dccp/ipv6.c:947 __inet_stream_connect+0x7ff/0x1000 net/ipv4/af_inet.c:655 inet_stream_connect+0x53/0xa0 net/ipv4/af_inet.c:719 __sys_connect+0x2f9/0x500 net/socket.c:1709 __do_sys_connect net/socket.c:1720 [inline] __se_sys_connect net/socket.c:1717 [inline] __x64_sys_connect+0x6e/0xb0 net/socket.c:1717 do_syscall_64+0x183/0x700 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4577a9 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f16f97b4c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004577a9 RDX: 000000000000001c RSI: 0000000020419000 RDI: 000000000000000a RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f16f97b56d4 R13: 00000000004bdcc7 R14: 00000000004cd6d8 R15: 00000000ffffffff Allocated by task 21615: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x780 mm/slab.c:3554 ccid_new+0x1d5/0x360 net/dccp/ccid.c:151 dccp_hdlr_ccid+0x1e/0x110 net/dccp/feat.c:44 __dccp_feat_activate+0x11b/0x240 net/dccp/feat.c:344 dccp_feat_activate_values+0x2dd/0x779 net/dccp/feat.c:1538 dccp_rcv_request_sent_state_process net/dccp/input.c:472 [inline] dccp_rcv_state_process+0xde2/0x1675 net/dccp/input.c:678 dccp_v6_do_rcv+0x1ef/0xbb0 net/dccp/ipv6.c:638 sk_backlog_rcv include/net/sock.h:914 [inline] __release_sock+0x110/0x330 net/core/sock.c:2342 release_sock+0xa3/0x290 net/core/sock.c:2851 inet_wait_for_connect net/ipv4/af_inet.c:588 [inline] __inet_stream_connect+0x55a/0x1000 net/ipv4/af_inet.c:680 inet_stream_connect+0x53/0xa0 net/ipv4/af_inet.c:719 __sys_connect+0x2f9/0x500 net/socket.c:1709 __do_sys_connect net/socket.c:1720 [inline] __se_sys_connect net/socket.c:1717 [inline] __x64_sys_connect+0x6e/0xb0 net/socket.c:1717 do_syscall_64+0x183/0x700 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 21615: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kmem_cache_free+0x83/0x2d0 mm/slab.c:3756 ccid_hc_tx_delete+0xac/0xf0 net/dccp/ccid.c:190 dccp_hdlr_ccid+0x60/0x110 net/dccp/feat.c:53 __dccp_feat_activate+0x11b/0x240 net/dccp/feat.c:344 dccp_feat_activate_values+0x2dd/0x779 net/dccp/feat.c:1538 dccp_create_openreq_child+0x467/0x600 net/dccp/minisocks.c:127 dccp_v6_request_recv_sock+0x20b/0x1e30 net/dccp/ipv6.c:466 dccp_check_req+0x2a3/0x730 net/dccp/minisocks.c:196 dccp_v6_rcv+0x6e7/0x1e0c net/dccp/ipv6.c:744 ip6_input_finish+0x346/0x1740 net/ipv6/ip6_input.c:284 NF_HOOK include/linux/netfilter.h:287 [inline] ip6_input+0xda/0x570 net/ipv6/ip6_input.c:327 dst_input include/net/dst.h:450 [inline] ip6_rcv_finish+0x1f5/0x850 net/ipv6/ip6_input.c:71 NF_HOOK include/linux/netfilter.h:287 [inline] ipv6_rcv+0xf52/0x2510 net/ipv6/ip6_input.c:208 __netif_receive_skb_core+0x1fba/0x3620 net/core/dev.c:4628 __netif_receive_skb+0x1f/0x1a0 net/core/dev.c:4693 process_backlog+0x1ca/0x6d0 net/core/dev.c:5373 napi_poll net/core/dev.c:5771 [inline] net_rx_action+0x758/0x1850 net/core/dev.c:5837 __do_softirq+0x308/0xb7b kernel/softirq.c:284 The buggy address belongs to the object at ffff8801ba717800 which belongs to the cache ccid2_hc_tx_sock of size 1240 The buggy address is located 0 bytes inside of 1240-byte region [ffff8801ba717800, ffff8801ba717cd8) The buggy address belongs to the page: page:ffffea0006e9c580 count:1 mapcount:0 mapping:ffff8801c5c37600 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffffea0006f36788 ffffea000737d308 ffff8801c5c37600 raw: 0000000000000000 ffff8801ba716200 0000000100000005 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801ba717700: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc ffff8801ba717780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8801ba717800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801ba717880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801ba717900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================