UBSAN: shift-out-of-bounds in xprt_calc

UBSAN: shift-out-of-bounds in xprt_calc_majortimeo
Status: upstream: reported C repro on 2020/12/15 15:03
Reported-by: syzbot+ba2e91df8f74809417fa@syzkaller.appspotmail.com
First crash: 48d, last: 8h28m

Cause bisection: introduced by (bisect log) [merge commit]:
commit 1609d7604b847a9820e63393d1a3b6cac7286d40
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date: Sat Sep 14 23:07:40 2019 +0000

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Crash: general protection fault in batadv_iv_ogm_queue_add (log)
Repro: C syz .config

Patch testing requests:
Created	Duration	User	Patch	Repo	Result
2021/01/08 14:11	9m	anant.thazhemadam@gmail.com		upstream	report log

Sample crash report:

================================================================================
UBSAN: shift-out-of-bounds in net/sunrpc/xprt.c:658:14
shift exponent 536871232 is too large for 64-bit type 'long unsigned int'
CPU: 1 PID: 8494 Comm: syz-executor211 Not tainted 5.10.0-rc7-next-20201210-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 ubsan_epilogue+0xb/0x5a lib/ubsan.c:148
 __ubsan_handle_shift_out_of_bounds.cold+0xb1/0x181 lib/ubsan.c:395
 xprt_calc_majortimeo.isra.0.cold+0x17/0x46 net/sunrpc/xprt.c:658
 xprt_init_majortimeo net/sunrpc/xprt.c:686 [inline]
 xprt_request_init+0x486/0x9e0 net/sunrpc/xprt.c:1805
 xprt_do_reserve net/sunrpc/xprt.c:1815 [inline]
 xprt_reserve+0x18f/0x280 net/sunrpc/xprt.c:1836
 __rpc_execute+0x21d/0x1360 net/sunrpc/sched.c:891
 rpc_execute+0x230/0x350 net/sunrpc/sched.c:967
 rpc_run_task+0x5d0/0x8f0 net/sunrpc/clnt.c:1140
 rpc_call_sync+0xc6/0x1a0 net/sunrpc/clnt.c:1169
 rpc_ping net/sunrpc/clnt.c:2682 [inline]
 rpc_create_xprt+0x3f1/0x4a0 net/sunrpc/clnt.c:477
 rpc_create+0x354/0x670 net/sunrpc/clnt.c:593
 nfs_create_rpc_client+0x4eb/0x680 fs/nfs/client.c:536
 nfs_init_client fs/nfs/client.c:653 [inline]
 nfs_init_client+0x6d/0x100 fs/nfs/client.c:640
 nfs_get_client+0xcd7/0x1020 fs/nfs/client.c:430
 nfs_init_server.isra.0+0x2c0/0xed0 fs/nfs/client.c:692
 nfs_create_server+0x18f/0x650 fs/nfs/client.c:996
 nfs_try_get_tree+0x181/0x9f0 fs/nfs/super.c:939
 nfs_get_tree+0xaa1/0x1520 fs/nfs/fs_context.c:1350
 vfs_get_tree+0x89/0x2f0 fs/super.c:1496
 do_new_mount fs/namespace.c:2896 [inline]
 path_mount+0x12ae/0x1e70 fs/namespace.c:3227
 do_mount fs/namespace.c:3240 [inline]
 __do_sys_mount fs/namespace.c:3448 [inline]
 __se_sys_mount fs/namespace.c:3425 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3425
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440419
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 7b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffe282dde28 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440419
RDX: 0000000020fb5ffc RSI: 0000000020343ff8 RDI: 0000000020000100
RBP: 00000000006ca018 R08: 000000002000a000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401c20
R13: 0000000000401cb0 R14: 0000000000000000 R15: 0000000000000000
================================================================================

Crashes (19):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Maintainers
ci-upstream-linux-next-kasan-gce-root	2020/12/11 22:10	linux-next	14240d4c	ba24ffcd	.config	log	report	syz	C		anna.schumaker@netapp.com, bfields@fieldses.org, chuck.lever@oracle.com, davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, netdev@vger.kernel.org, trond.myklebust@hammerspace.com
ci-upstream-kasan-gce-selinux-root	2021/01/24 23:57	upstream	e6806137	52e37319	.config	log	report			info	anna.schumaker@netapp.com, bfields@fieldses.org, chuck.lever@oracle.com, davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, netdev@vger.kernel.org, trond.myklebust@hammerspace.com
ci-upstream-kasan-gce-root	2021/01/24 10:42	upstream	e1ae4b0b	52e37319	.config	log	report			info	anna.schumaker@netapp.com, bfields@fieldses.org, chuck.lever@oracle.com, davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, netdev@vger.kernel.org, trond.myklebust@hammerspace.com
ci-upstream-kasan-gce-selinux-root	2021/01/21 02:37	upstream	75439bc4	d4f4eca5	.config	log	report			info	anna.schumaker@netapp.com, bfields@fieldses.org, chuck.lever@oracle.com, davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, netdev@vger.kernel.org, trond.myklebust@hammerspace.com
ci-upstream-kasan-gce-selinux-root	2021/01/20 17:41	upstream	45dfb8a5	d4f4eca5	.config	log	report			info	anna.schumaker@netapp.com, bfields@fieldses.org, chuck.lever@oracle.com, davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, netdev@vger.kernel.org, trond.myklebust@hammerspace.com
ci-upstream-kasan-gce-root	2021/01/20 16:51	upstream	45dfb8a5	d4f4eca5	.config	log	report			info	anna.schumaker@netapp.com, bfields@fieldses.org, chuck.lever@oracle.com, davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, netdev@vger.kernel.org, trond.myklebust@hammerspace.com
ci-upstream-kasan-gce-root	2021/01/19 19:17	upstream	1e2a199f	63631df1	.config	log	report			info	anna.schumaker@netapp.com, bfields@fieldses.org, chuck.lever@oracle.com, davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, netdev@vger.kernel.org, trond.myklebust@hammerspace.com
ci-qemu-upstream	2021/01/18 00:22	upstream	a527a2b3	fd103621	.config	log	report			info	anna.schumaker@netapp.com, bfields@fieldses.org, chuck.lever@oracle.com, davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, netdev@vger.kernel.org, trond.myklebust@hammerspace.com
ci-upstream-kasan-gce-selinux-root	2021/01/16 23:44	upstream	1d94330a	65a7a854	.config	log	report			info	anna.schumaker@netapp.com, bfields@fieldses.org, chuck.lever@oracle.com, davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, netdev@vger.kernel.org, trond.myklebust@hammerspace.com
ci-upstream-kasan-gce-selinux-root	2021/01/16 23:43	upstream	1d94330a	65a7a854	.config	log	report			info	anna.schumaker@netapp.com, bfields@fieldses.org, chuck.lever@oracle.com, davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, netdev@vger.kernel.org, trond.myklebust@hammerspace.com
ci-upstream-kasan-gce-root	2021/01/16 23:25	upstream	1d94330a	65a7a854	.config	log	report			info	anna.schumaker@netapp.com, bfields@fieldses.org, chuck.lever@oracle.com, davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, netdev@vger.kernel.org, trond.myklebust@hammerspace.com
ci-upstream-kasan-gce-root	2021/01/11 22:20	upstream	7c53f6b6	2c1f2513	.config	log	report			info	anna.schumaker@netapp.com, bfields@fieldses.org, chuck.lever@oracle.com, davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, netdev@vger.kernel.org, trond.myklebust@hammerspace.com
ci-upstream-kasan-gce-selinux-root	2020/12/21 19:37	upstream	e37b12e4	04201c06	.config	log	report			info	anna.schumaker@netapp.com, bfields@fieldses.org, chuck.lever@oracle.com, davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, netdev@vger.kernel.org, trond.myklebust@hammerspace.com
ci-upstream-kasan-gce-selinux-root	2020/12/16 22:34	upstream	5e60366d	04201c06	.config	log	report			info	anna.schumaker@netapp.com, bfields@fieldses.org, chuck.lever@oracle.com, davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, netdev@vger.kernel.org, trond.myklebust@hammerspace.com
ci-upstream-kasan-gce-selinux-root	2020/12/16 19:51	upstream	5e60366d	04201c06	.config	log	report			info	anna.schumaker@netapp.com, bfields@fieldses.org, chuck.lever@oracle.com, davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, netdev@vger.kernel.org, trond.myklebust@hammerspace.com
ci-upstream-kasan-gce-selinux-root	2020/12/16 17:00	upstream	5e60366d	f213e07e	.config	log	report			info	anna.schumaker@netapp.com, bfields@fieldses.org, chuck.lever@oracle.com, davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, netdev@vger.kernel.org, trond.myklebust@hammerspace.com
ci-upstream-linux-next-kasan-gce-root	2020/12/11 20:01	linux-next	14240d4c	ba24ffcd	.config	log	report			info	anna.schumaker@netapp.com, bfields@fieldses.org, chuck.lever@oracle.com, davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, netdev@vger.kernel.org, trond.myklebust@hammerspace.com
ci-upstream-linux-next-kasan-gce-root	2020/12/07 15:15	linux-next	15ac8fdb	1190297f	.config	log	report			info	anna.schumaker@netapp.com, bfields@fieldses.org, chuck.lever@oracle.com, davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, netdev@vger.kernel.org, trond.myklebust@hammerspace.com
ci-upstream-linux-next-kasan-gce-root	2020/12/07 13:18	linux-next	15ac8fdb	1190297f	.config	log	report			info	anna.schumaker@netapp.com, bfields@fieldses.org, chuck.lever@oracle.com, davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, netdev@vger.kernel.org, trond.myklebust@hammerspace.com