WARNING: refcount bug in smc

Title	Replies (including bot)	Last reply
[PATCH 5.3 000/140] 5.3.10-stable review	146 (146)	2019/11/09 15:50
[PATCH net 1/1] net/smc: fix refcounting for non-blocking connect()	2 (2)	2019/10/30 01:10
WARNING: refcount bug in smc_release	0 (1)	2019/10/24 00:26

Title

Replies (including bot)

Last reply

[PATCH 5.3 000/140] 5.3.10-stable review

146 (146)

2019/11/09 15:50

[PATCH net 1/1] net/smc: fix refcounting for non-blocking connect()

2 (2)

2019/10/30 01:10

WARNING: refcount bug in smc_release

0 (1)

2019/10/24 00:26

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	WARNING: refcount bug in smc_release (2) net s390	C	done		9	1590d	1613d	15/26	fixed on 2020/02/14 01:19
upstream	WARNING: refcount bug in smc_release (3) net s390				1	1336d	1325d	15/26	fixed on 2020/09/25 01:17

------------[ cut here ]------------ refcount_t: underflow; use-after-free. WARNING: CPU: 0 PID: 8688 at lib/refcount.c:190 refcount_sub_and_test_checked lib/refcount.c:190 [inline] WARNING: CPU: 0 PID: 8688 at lib/refcount.c:190 refcount_sub_and_test_checked+0x1d0/0x200 lib/refcount.c:180 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 8688 Comm: syz-executor713 Not tainted 5.4.0-rc3+ #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+0x172/0x1f0 lib/dump_stack.c:113 panic+0x2e3/0x75c kernel/panic.c:221 __warn.cold+0x2f/0x35 kernel/panic.c:582 report_bug+0x289/0x300 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:179 [inline] fixup_bug arch/x86/kernel/traps.c:174 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1028 RIP: 0010:refcount_sub_and_test_checked lib/refcount.c:190 [inline] RIP: 0010:refcount_sub_and_test_checked+0x1d0/0x200 lib/refcount.c:180 Code: 1d 24 69 7e 06 31 ff 89 de e8 bc ba 2e fe 84 db 75 94 e8 73 b9 2e fe 48 c7 c7 00 ae e6 87 c6 05 04 69 7e 06 01 e8 18 fc ff fd <0f> 0b e9 75 ff ff ff e8 54 b9 2e fe e9 6e ff ff ff 48 89 df e8 d7 RSP: 0018:ffff88808bb6fcb0 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff815cb796 RDI: ffffed101176df88 RBP: ffff88808bb6fd48 R08: ffff8880993b2200 R09: fffffbfff14f0746 R10: fffffbfff14f0745 R11: ffffffff8a783a2f R12: 00000000ffffffff R13: 0000000000000001 R14: ffff88808bb6fd20 R15: 0000000000000000 refcount_dec_and_test_checked+0x1b/0x20 lib/refcount.c:220 sock_put include/net/sock.h:1729 [inline] smc_release+0x236/0x3e0 net/smc/af_smc.c:194 __sock_release+0xce/0x280 net/socket.c:590 sock_close+0x1e/0x30 net/socket.c:1268 __fput+0x2ff/0x890 fs/file_table.c:280 ____fput+0x16/0x20 fs/file_table.c:313 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] syscall_return_slowpath arch/x86/entry/common.c:274 [inline] do_syscall_64+0x65f/0x760 arch/x86/entry/common.c:300 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x401fb0 Code: 01 f0 ff ff 0f 83 40 0d 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d 7d 8b 2d 00 00 75 14 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 14 0d 00 00 c3 48 83 ec 08 e8 7a 02 00 00 RSP: 002b:00007fff583762f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000401fb0 RDX: 0000000000000017 RSI: 0000000000000006 RDI: 0000000000000003 RBP: 0000000000010b24 R08: 0000000000000004 R09: 0000000500000000 R10: 0000000020000240 R11: 0000000000000246 R12: 0000000000000000 R13: 00000000004031e0 R14: 0000000000000000 R15: 0000000000000000 Kernel Offset: disabled Rebooting in 86400 seconds..

Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Manager
2019/10/23 07:51	net-next-old	406715df933a	d0686497	.config	console log	report	syz	C	ci-upstream-net-kasan-gce
2019/11/16 10:33	linux-next	5a6fcbeabe3e	cdac920b	.config	console log	report	syz	C	ci-upstream-linux-next-kasan-gce-root
2019/10/27 19:02	net-next-old	b951248518e6	25bb509e	.config	console log	report			ci-upstream-net-kasan-gce
2019/10/25 17:24	net-next-old	503a64635d5e	c2e837da	.config	console log	report			ci-upstream-net-kasan-gce
2019/10/23 07:22	net-next-old	406715df933a	d0686497	.config	console log	report			ci-upstream-net-kasan-gce
2019/11/16 00:37	linux-next	5a6fcbeabe3e	cdac920b	.config	console log	report			ci-upstream-linux-next-kasan-gce-root
2019/10/30 13:35	linux-next	fdbc6c104f95	5ea87a66	.config	console log	report			ci-upstream-linux-next-kasan-gce-root
2019/10/28 23:22	linux-next	60c1769a45f4	439d7b14	.config	console log	report			ci-upstream-linux-next-kasan-gce-root