bisecting cause commit starting from 0a8ad0ffa4d80a544f6cbff703bf6394339afcdf
building syzkaller on f613a7c41d0b3ea16eeaad515e44dec003688ffb
testing commit 0a8ad0ffa4d80a544f6cbff703bf6394339afcdf with gcc (GCC) 8.1.0
run #0: crashed: KASAN: use-after-free Read in nr_insert_socket
run #1: crashed: WARNING: refcount bug in nr_insert_socket
run #2: crashed: WARNING: refcount bug in nr_insert_socket
run #3: crashed: WARNING: refcount bug in nr_insert_socket
run #4: crashed: WARNING: refcount bug in nr_insert_socket
run #5: crashed: WARNING: refcount bug in nr_insert_socket
run #6: crashed: WARNING: refcount bug in nr_insert_socket
run #7: crashed: KASAN: use-after-free Read in nr_insert_socket
run #8: crashed: WARNING: refcount bug in nr_insert_socket
run #9: OK
testing release v5.2
testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0
all runs: OK
# git bisect start 0a8ad0ffa4d80a544f6cbff703bf6394339afcdf v5.2
Bisecting: 5432 revisions left to test after this (roughly 13 steps)
[237f83dfbe668443b5e31c3c7576125871cca674] Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
testing commit 237f83dfbe668443b5e31c3c7576125871cca674 with gcc (GCC) 8.1.0
run #0: crashed: WARNING: refcount bug in nr_insert_socket
run #1: crashed: WARNING: refcount bug in nr_insert_socket
run #2: crashed: WARNING: refcount bug in nr_insert_socket
run #3: crashed: WARNING: refcount bug in nr_insert_socket
run #4: crashed: WARNING: refcount bug in nr_insert_socket
run #5: crashed: KASAN: use-after-free Read in nr_insert_socket
run #6: crashed: WARNING: refcount bug in nr_insert_socket
run #7: crashed: WARNING: refcount bug in nr_insert_socket
run #8: crashed: KASAN: use-after-free Read in nr_release
run #9: crashed: general protection fault in send_hsr_supervision_frame
# git bisect bad 237f83dfbe668443b5e31c3c7576125871cca674
Bisecting: 2907 revisions left to test after this (roughly 12 steps)
[cdc5ffc4100549654e19e6f068cf1fc0871a85c2] Merge tag 'for-5.3/libata-20190708' of git://git.kernel.dk/linux-block
testing commit cdc5ffc4100549654e19e6f068cf1fc0871a85c2 with gcc (GCC) 8.1.0
all runs: OK
# git bisect good cdc5ffc4100549654e19e6f068cf1fc0871a85c2
Bisecting: 1453 revisions left to test after this (roughly 11 steps)
[5b0d7d7da64b42175a41b9c39de0a512216621cd] net: stmmac: Add the missing speeds that XGMAC supports
testing commit 5b0d7d7da64b42175a41b9c39de0a512216621cd with gcc (GCC) 8.1.0
all runs: OK
# git bisect good 5b0d7d7da64b42175a41b9c39de0a512216621cd
Bisecting: 697 revisions left to test after this (roughly 10 steps)
[af144a983402f7fd324ce556d9f9011a8b3e01fe] Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
testing commit af144a983402f7fd324ce556d9f9011a8b3e01fe with gcc (GCC) 8.1.0
run #0: crashed: WARNING: refcount bug in nr_insert_socket
run #1: crashed: KASAN: use-after-free Read in nr_release
run #2: crashed: WARNING: refcount bug in nr_insert_socket
run #3: crashed: WARNING: refcount bug in nr_insert_socket
run #4: crashed: WARNING: refcount bug in nr_insert_socket
run #5: crashed: WARNING: refcount bug in nr_insert_socket
run #6: crashed: WARNING: refcount bug in nr_insert_socket
run #7: crashed: WARNING: refcount bug in nr_insert_socket
run #8: crashed: general protection fault in send_hsr_supervision_frame
run #9: OK
# git bisect bad af144a983402f7fd324ce556d9f9011a8b3e01fe
Bisecting: 388 revisions left to test after this (roughly 9 steps)
[9ce67c3235be71e8cf922a9b3d0b7359ed3f4ce5] Bluetooth: btusb: Add protocol support for MediaTek MT7663U USB devices
testing commit 9ce67c3235be71e8cf922a9b3d0b7359ed3f4ce5 with gcc (GCC) 8.1.0
all runs: OK
# git bisect good 9ce67c3235be71e8cf922a9b3d0b7359ed3f4ce5
Bisecting: 194 revisions left to test after this (roughly 8 steps)
[0287f9ed1693fff26a2d568a9d3f74c2b198540c] gve: fix unused variable/label warnings
testing commit 0287f9ed1693fff26a2d568a9d3f74c2b198540c with gcc (GCC) 8.1.0
all runs: OK
# git bisect good 0287f9ed1693fff26a2d568a9d3f74c2b198540c
Bisecting: 97 revisions left to test after this (roughly 7 steps)
[114b5b355ec0b6e83a6628a5ab5d03e50fd40a31] Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec
testing commit 114b5b355ec0b6e83a6628a5ab5d03e50fd40a31 with gcc (GCC) 8.1.0
run #0: crashed: WARNING: refcount bug in nr_insert_socket
run #1: crashed: WARNING: refcount bug in nr_insert_socket
run #2: crashed: WARNING: refcount bug in nr_insert_socket
run #3: crashed: WARNING: refcount bug in nr_insert_socket
run #4: crashed: WARNING: refcount bug in nr_insert_socket
run #5: crashed: KASAN: use-after-free Read in nr_release
run #6: crashed: WARNING: refcount bug in nr_insert_socket
run #7: crashed: WARNING: refcount bug in nr_insert_socket
run #8: OK
run #9: OK
# git bisect bad 114b5b355ec0b6e83a6628a5ab5d03e50fd40a31
Bisecting: 48 revisions left to test after this (roughly 6 steps)
[17dd1367389cfe7f150790c83247b68e0c19d106] vsock/virtio: stop workers during the .remove()
testing commit 17dd1367389cfe7f150790c83247b68e0c19d106 with gcc (GCC) 8.1.0
run #0: crashed: WARNING: refcount bug in nr_insert_socket
run #1: crashed: WARNING: refcount bug in nr_insert_socket
run #2: crashed: KASAN: use-after-free Read in nr_release
run #3: crashed: WARNING: refcount bug in nr_insert_socket
run #4: crashed: WARNING: refcount bug in nr_insert_socket
run #5: crashed: WARNING: refcount bug in nr_insert_socket
run #6: crashed: WARNING: refcount bug in nr_insert_socket
run #7: crashed: WARNING: refcount bug in nr_insert_socket
run #8: OK
run #9: OK
# git bisect bad 17dd1367389cfe7f150790c83247b68e0c19d106
Bisecting: 23 revisions left to test after this (roughly 5 steps)
[9b6c08878e23adb7cc84bdca94d8a944b03f099e] sctp: not bind the socket in sctp_connect
testing commit 9b6c08878e23adb7cc84bdca94d8a944b03f099e with gcc (GCC) 8.1.0
all runs: OK
# git bisect good 9b6c08878e23adb7cc84bdca94d8a944b03f099e
Bisecting: 11 revisions left to test after this (roughly 4 steps)
[1dbc59fa4bbaa108b641cd65a54f662b75e4ed36] bnxt_en: Cap the returned MSIX vectors to the RDMA driver.
testing commit 1dbc59fa4bbaa108b641cd65a54f662b75e4ed36 with gcc (GCC) 8.1.0
all runs: OK
# git bisect good 1dbc59fa4bbaa108b641cd65a54f662b75e4ed36
Bisecting: 5 revisions left to test after this (roughly 3 steps)
[88405680ec57c35f5886dbb81b3f6f638f74f40d] net:gue.h:Fix shifting signed 32-bit value by 31 bits problem
testing commit 88405680ec57c35f5886dbb81b3f6f638f74f40d with gcc (GCC) 8.1.0
all runs: OK
# git bisect good 88405680ec57c35f5886dbb81b3f6f638f74f40d
Bisecting: 2 revisions left to test after this (roughly 2 steps)
[4d1415811e492d9a8238f8a92dd0d51612c788e9] sctp: fix error handling on stream scheduler initialization
testing commit 4d1415811e492d9a8238f8a92dd0d51612c788e9 with gcc (GCC) 8.1.0
run #0: crashed: KASAN: use-after-free Read in nr_release
run #1: crashed: WARNING: refcount bug in nr_insert_socket
run #2: crashed: WARNING: refcount bug in nr_insert_socket
run #3: crashed: WARNING: refcount bug in nr_insert_socket
run #4: crashed: WARNING: refcount bug in nr_insert_socket
run #5: crashed: WARNING: refcount bug in nr_insert_socket
run #6: OK
run #7: OK
run #8: OK
run #9: OK
# git bisect bad 4d1415811e492d9a8238f8a92dd0d51612c788e9
Bisecting: 0 revisions left to test after this (roughly 1 step)
[c8c8218ec5af5d2598381883acbefbf604e56b5e] netrom: fix a memory leak in nr_rx_frame()
testing commit c8c8218ec5af5d2598381883acbefbf604e56b5e with gcc (GCC) 8.1.0
run #0: crashed: WARNING: refcount bug in nr_insert_socket
run #1: crashed: WARNING: refcount bug in nr_insert_socket
run #2: crashed: WARNING: refcount bug in nr_insert_socket
run #3: crashed: WARNING: refcount bug in nr_insert_socket
run #4: crashed: WARNING: refcount bug in nr_insert_socket
run #5: crashed: WARNING: refcount bug in nr_insert_socket
run #6: crashed: WARNING: refcount bug in nr_insert_socket
run #7: crashed: WARNING: refcount bug in nr_insert_socket
run #8: crashed: WARNING: refcount bug in nr_insert_socket
run #9: OK
# git bisect bad c8c8218ec5af5d2598381883acbefbf604e56b5e
Bisecting: 0 revisions left to test after this (roughly 0 steps)
[2e60546368165c2449564d71f6005dda9205b5fb] ipv4: don't set IPv6 only flags to IPv4 addresses
testing commit 2e60546368165c2449564d71f6005dda9205b5fb with gcc (GCC) 8.1.0
all runs: OK
# git bisect good 2e60546368165c2449564d71f6005dda9205b5fb
c8c8218ec5af5d2598381883acbefbf604e56b5e is the first bad commit
commit c8c8218ec5af5d2598381883acbefbf604e56b5e
Author: Cong Wang <xiyou.wangcong@gmail.com>
Date:   Thu Jun 27 14:30:58 2019 -0700

    netrom: fix a memory leak in nr_rx_frame()
    
    When the skb is associated with a new sock, just assigning
    it to skb->sk is not sufficient, we have to set its destructor
    to free the sock properly too.
    
    Reported-by: syzbot+d6636a36d3c34bd88938@syzkaller.appspotmail.com
    Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>

:040000 040000 4c07dae2c063172c527c8acf843b916a275a70ce 1c43141d5e0b704990d869e2ed626126f1596f0b M	net
revisions tested: 16, total time: 4h37m3.598508598s (build: 1h29m33.768829011s, test: 3h2m45.117126255s)
first bad commit: c8c8218ec5af5d2598381883acbefbf604e56b5e netrom: fix a memory leak in nr_rx_frame()
cc: ["davem@davemloft.net" "linux-hams@vger.kernel.org" "linux-kernel@vger.kernel.org" "netdev@vger.kernel.org" "ralf@linux-mips.org" "xiyou.wangcong@gmail.com"]
crash: WARNING: refcount bug in nr_insert_socket
------------[ cut here ]------------
refcount_t: increment on 0; use-after-free.
WARNING: CPU: 1 PID: 0 at lib/refcount.c:156 refcount_inc_checked+0x2b/0x30 /lib/refcount.c:156
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.2.0-rc6+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack /lib/dump_stack.c:77 [inline]
 dump_stack+0x113/0x167 /lib/dump_stack.c:113
 panic+0x212/0x4cb /kernel/panic.c:219
 __warn.cold.8+0x1b/0x38 /kernel/panic.c:576
 report_bug+0x1a4/0x200 /lib/bug.c:186
 fixup_bug /arch/x86/kernel/traps.c:179 [inline]
 do_error_trap+0x11b/0x200 /arch/x86/kernel/traps.c:272
 do_invalid_op+0x36/0x40 /arch/x86/kernel/traps.c:291
 invalid_op+0x14/0x20 /arch/x86/entry/entry_64.S:986
RIP: 0010:refcount_inc_checked+0x2b/0x30 /lib/refcount.c:156
Code: 48 89 e5 e8 97 fe ff ff 84 c0 74 02 5d c3 80 3d 93 69 f3 05 00 75 f5 48 c7 c7 00 52 41 87 c6 05 83 69 f3 05 01 e8 a8 d2 3d fe <0f> 0b 5d c3 90 55 48 89 e5 41 56 41 55 49 89 fd 48 c7 c7 60 52 41
RSP: 0018:ffff8880aeb09c10 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff88809ec16e00 RCX: 0000000000000000
RDX: 0000000000000004 RSI: 0000000000000008 RDI: ffffffff89d60d40
RBP: ffff8880aeb09c10 R08: ffffed1015d640f1 R09: ffffed1015d640f0
R10: ffffed1015d640f0 R11: ffff8880aeb20787 R12: ffff8880a48d7840
R13: ffff88809ec16e68 R14: 0000000000000034 R15: ffff88809ec1729e
 sock_hold /./include/net/sock.h:649 [inline]
 sk_add_node /./include/net/sock.h:701 [inline]
 nr_insert_socket+0x28/0xd0 /net/netrom/af_netrom.c:137
 nr_rx_frame+0x160f/0x1f00 /net/netrom/af_netrom.c:1023
 nr_loopback_timer+0x64/0x120 /net/netrom/nr_loopback.c:59
 call_timer_fn+0x14d/0x510 /kernel/time/timer.c:1322
 expire_timers /kernel/time/timer.c:1366 [inline]
 __run_timers /kernel/time/timer.c:1685 [inline]
 run_timer_softirq+0xc6f/0x1330 /kernel/time/timer.c:1698
 __do_softirq+0x260/0x958 /kernel/softirq.c:292
 invoke_softirq /kernel/softirq.c:373 [inline]
 irq_exit+0x17f/0x1c0 /kernel/softirq.c:413
 exiting_irq /./arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x13e/0x540 /arch/x86/kernel/apic/apic.c:1068
 apic_timer_interrupt+0xf/0x20 /arch/x86/entry/entry_64.S:806
 </IRQ>
RIP: 0010:native_safe_halt+0x12/0x20 /./arch/x86/include/asm/irqflags.h:61
Code: 11 ff ff ff 4c 89 e7 e8 6c f2 f4 fa eb 97 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 e9 07 00 00 00 0f 00 2d f0 41 64 00 fb f4 <5d> c3 66 90 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 e9 07 00 00
RSP: 0018:ffff8880a98d7d70 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: ffff8880a98c8340 RCX: 0000000000000000
RDX: 1ffffffff10643e1 RSI: 0000000000000006 RDI: ffffffff88321f08
RBP: ffff8880a98d7d70 R08: 0000000000000006 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffffffff88321ef8 R14: 0000000000000001 R15: ffffffff88f68438
 arch_safe_halt /./arch/x86/include/asm/paravirt.h:156 [inline]
 default_idle+0x51/0x310 /arch/x86/kernel/process.c:580
 arch_cpu_idle+0xa/0x10 /arch/x86/kernel/process.c:571
 default_idle_call+0x6d/0x90 /kernel/sched/idle.c:94
 cpuidle_idle_call /kernel/sched/idle.c:154 [inline]
 do_idle+0x3e4/0x590 /kernel/sched/idle.c:263
 cpu_startup_entry+0x18/0x20 /kernel/sched/idle.c:354
 start_secondary+0x367/0x4b0 /arch/x86/kernel/smpboot.c:265
 secondary_startup_64+0xa4/0xb0 /arch/x86/kernel/head_64.S:243
Kernel Offset: disabled
Rebooting in 86400 seconds..