On giovedì 17 febbraio 2022 19:13:19 CET syzbot wrote:
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    5740d0689096 net: sched: limit TC_ACT_REPEAT loops
> git tree:       net
> console output: https://syzkaller.appspot.com/x/log.txt?x=1474360e700000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=88e226f0197aeba5
> dashboard link: https://syzkaller.appspot.com/bug?extid=4f322a6d84e991c38775
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13dd93f2700000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16a497e2700000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+4f322a6d84e991c38775@syzkaller.appspotmail.com
> 
> infiniband syz1: set active
> infiniband syz1: added lo
> RDS/IB: syz1: added
> smc: adding ib device syz1 with port count 1
> BUG: sleeping function called from invalid context at kernel/locking/mutex.c:577
> in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3589, name: syz-executor180
> preempt_count: 1, expected: 0
> RCU nest depth: 0, expected: 0
> 6 locks held by syz-executor180/3589:
>  #0: ffffffff90865838 (&rdma_nl_types[idx].sem){.+.+}-{3:3}, at: rdma_nl_rcv_msg+0x161/0x690 drivers/infiniband/core/netlink.c:164
>  #1: ffffffff8d04edf0 (link_ops_rwsem){++++}-{3:3}, at: nldev_newlink+0x25d/0x560 drivers/infiniband/core/nldev.c:1707
>  #2: ffffffff8d03e650 (devices_rwsem){++++}-{3:3}, at: enable_device_and_get+0xfc/0x3b0 drivers/infiniband/core/device.c:1321
>  #3: ffffffff8d03e510 (clients_rwsem){++++}-{3:3}, at: enable_device_and_get+0x15b/0x3b0 drivers/infiniband/core/device.c:1329
>  #4: ffff8880790445c0 (&device->client_data_rwsem){++++}-{3:3}, at: add_client_context+0x3d0/0x5e0 drivers/infiniband/core/device.c:718
>  #5: ffff88814a29c818 (&pnettable->lock){++++}-{2:2}, at: smc_pnetid_by_table_ib+0x18c/0x470 net/smc/smc_pnet.c:1159
> Preemption disabled at:
> [<0000000000000000>] 0x0
> CPU: 0 PID: 3589 Comm: syz-executor180 Not tainted 5.17.0-rc3-syzkaller-00174-g5740d0689096 #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> Call Trace:
>  <TASK>
>  __dump_stack lib/dump_stack.c:88 [inline]
>  dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
>  __might_resched.cold+0x222/0x26b kernel/sched/core.c:9576
>  __mutex_lock_common kernel/locking/mutex.c:577 [inline]
>  __mutex_lock+0x9f/0x12f0 kernel/locking/mutex.c:733
>  smc_pnet_apply_ib+0x28/0x160 net/smc/smc_pnet.c:251
>  smc_pnetid_by_table_ib+0x2ae/0x470 net/smc/smc_pnet.c:1164
>  smc_ib_add_dev+0x4d7/0x900 net/smc/smc_ib.c:940
>  add_client_context+0x405/0x5e0 drivers/infiniband/core/device.c:720
>  enable_device_and_get+0x1cd/0x3b0 drivers/infiniband/core/device.c:1331
>  ib_register_device drivers/infiniband/core/device.c:1419 [inline]
>  ib_register_device+0x814/0xaf0 drivers/infiniband/core/device.c:1365
>  rxe_register_device+0x2fe/0x3b0 drivers/infiniband/sw/rxe/rxe_verbs.c:1146
>  rxe_add+0x1331/0x1710 drivers/infiniband/sw/rxe/rxe.c:246
>  rxe_net_add+0x8c/0xe0 drivers/infiniband/sw/rxe/rxe_net.c:538
>  rxe_newlink drivers/infiniband/sw/rxe/rxe.c:268 [inline]
>  rxe_newlink+0xa9/0xd0 drivers/infiniband/sw/rxe/rxe.c:249
>  nldev_newlink+0x30a/0x560 drivers/infiniband/core/nldev.c:1717
>  rdma_nl_rcv_msg+0x36d/0x690 drivers/infiniband/core/netlink.c:195
>  rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline]
>  rdma_nl_rcv+0x2ee/0x430 drivers/infiniband/core/netlink.c:259
>  netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
>  netlink_unicast+0x539/0x7e0 net/netlink/af_netlink.c:1343
>  netlink_sendmsg+0x904/0xe00 net/netlink/af_netlink.c:1919
>  sock_sendmsg_nosec net/socket.c:705 [inline]
>  sock_sendmsg+0xcf/0x120 net/socket.c:725
>  ____sys_sendmsg+0x6e8/0x810 net/socket.c:2413
>  ___sys_sendmsg+0xf3/0x170 net/socket.c:2467
>  __sys_sendmsg+0xe5/0x1b0 net/socket.c:2496
>  do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>  do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>  entry_SYSCALL_64_after_hwframe+0x44/0xae
> RIP: 0033:0x7f7ef25bed59
> Code: 28 c3 e8 5a 14 00 00 66 2e 0f 1f 84 00 00 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007ffcd0ce91d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
> RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7ef25bed59
> RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000005
> RBP: 00007f7ef25827c0 R08: 0000000000000014 R09: 0000000000000000
> R10: 0000000000000041 R11: 0000000000000246 R12: 00007f7ef2582850
> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
>  </TASK>
> 
> =============================
> [ BUG: Invalid wait context ]
> 5.17.0-rc3-syzkaller-00174-g5740d0689096 #0 Tainted: G        W        
> -----------------------------
> syz-executor180/3589 is trying to lock:
> ffffffff8d7100d8 (smc_ib_devices.mutex){+.+.}-{3:3}, at: smc_pnet_apply_ib+0x28/0x160 net/smc/smc_pnet.c:251
> other info that might help us debug this:
> context-{4:4}
> 6 locks held by syz-executor180/3589:
>  #0: ffffffff90865838 (&rdma_nl_types[idx].sem){.+.+}-{3:3}, at: rdma_nl_rcv_msg+0x161/0x690 drivers/infiniband/core/netlink.c:164
>  #1: ffffffff8d04edf0 (link_ops_rwsem){++++}-{3:3}, at: nldev_newlink+0x25d/0x560 drivers/infiniband/core/nldev.c:1707
>  #2: ffffffff8d03e650 (devices_rwsem){++++}-{3:3}, at: enable_device_and_get+0xfc/0x3b0 drivers/infiniband/core/device.c:1321
>  #3: ffffffff8d03e510 (clients_rwsem){++++}-{3:3}, at: enable_device_and_get+0x15b/0x3b0 drivers/infiniband/core/device.c:1329
>  #4: ffff8880790445c0 (&device->client_data_rwsem){++++}-{3:3}, at: add_client_context+0x3d0/0x5e0 drivers/infiniband/core/device.c:718
>  #5: ffff88814a29c818 (&pnettable->lock){++++}-{2:2}, at: smc_pnetid_by_table_ib+0x18c/0x470 net/smc/smc_pnet.c:1159
> stack backtrace:
> CPU: 0 PID: 3589 Comm: syz-executor180 Tainted: G        W         5.17.0-rc3-syzkaller-00174-g5740d0689096 #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> Call Trace:
>  <TASK>
>  __dump_stack lib/dump_stack.c:88 [inline]
>  dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
>  print_lock_invalid_wait_context kernel/locking/lockdep.c:4678 [inline]
>  check_wait_context kernel/locking/lockdep.c:4739 [inline]
>  __lock_acquire.cold+0x213/0x3ab kernel/locking/lockdep.c:4977
>  lock_acquire kernel/locking/lockdep.c:5639 [inline]
>  lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5604
>  __mutex_lock_common kernel/locking/mutex.c:600 [inline]
>  __mutex_lock+0x12f/0x12f0 kernel/locking/mutex.c:733
>  smc_pnet_apply_ib+0x28/0x160 net/smc/smc_pnet.c:251
>  smc_pnetid_by_table_ib+0x2ae/0x470 net/smc/smc_pnet.c:1164
>  smc_ib_add_dev+0x4d7/0x900 net/smc/smc_ib.c:940
>  add_client_context+0x405/0x5e0 drivers/infiniband/core/device.c:720
>  enable_device_and_get+0x1cd/0x3b0 drivers/infiniband/core/device.c:1331
>  ib_register_device drivers/infiniband/core/device.c:1419 [inline]
>  ib_register_device+0x814/0xaf0 drivers/infiniband/core/device.c:1365
>  rxe_register_device+0x2fe/0x3b0 drivers/infiniband/sw/rxe/rxe_verbs.c:1146
>  rxe_add+0x1331/0x1710 drivers/infiniband/sw/rxe/rxe.c:246
>  rxe_net_add+0x8c/0xe0 drivers/infiniband/sw/rxe/rxe_net.c:538
>  rxe_newlink drivers/infiniband/sw/rxe/rxe.c:268 [inline]
>  rxe_newlink+0xa9/0xd0 drivers/infiniband/sw/rxe/rxe.c:249
>  nldev_newlink+0x30a/0x560 drivers/infiniband/core/nldev.c:1717
>  rdma_nl_rcv_msg+0x36d/0x690 drivers/infiniband/core/netlink.c:195
>  rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline]
>  rdma_nl_rcv+0x2ee/0x430 drivers/infiniband/core/netlink.c:259
>  netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
>  netlink_unicast+0x539/0x7e0 net/netlink/af_netlink.c:1343
>  netlink_sendmsg+0x904/0xe00 net/netlink/af_netlink.c:1919
>  sock_sendmsg_nosec net/socket.c:705 [inline]
>  sock_sendmsg+0xcf/0x120 net/socket.c:725
>  ____sys_sendmsg+0x6e8/0x810 net/socket.c:2413
>  ___sys_sendmsg+0xf3/0x170 net/socket.c:2467
>  __sys_sendmsg+0xe5/0x1b0 net/socket.c:2496
>  do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>  do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>  entry_SYSCALL_64_after_hwframe+0x44/0xae
> RIP: 0033:0x7f7ef25bed59
> Code: 28 c3 e8 5a 14 00 00 66 2e 0f 1f 84 00 00 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007ffcd0ce91d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
> RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7ef25bed59
> RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000005
> RBP: 00007f7ef25827c0 R08: 0000000000000014 R09: 0000000000000000
> R10: 0000000000000041 R11: 0000000000000246 R12: 00007f7ef2582850
> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
>  </TASK>
> smc:    ib device syz1 port 1 has pnetid SYZ2 (user defined)
> 
As confirmed by Tony Lu (thanks!), replace rwlocks with mutexes for locking 
"struct smc_pnettable".

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

Fabio M. De Francesco

P.S.: I have just sent another diff but it has a stupid mistake so it cannot compile.