[tipc-discussion] [PATCH 3/3] tipc: fix issue of calling smp_processor_id() in preemptible
syzbot found the following issue: [ 81.119772][ T8612] BUG: using smp_processor_id() in preemptible [] code: syz-executor834/8612 [ 81.136212][ T8612] caller is dst_cache_get+0x3d/0xb0 [ 81.141450][ T8612] CPU: 0 PID: 8612 Comm: syz-executor834 Not tainted 5.2.0-rc6+ #48 [ 81.149435][ T8612] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 81.159480][ T8612] Call Trace: [ 81.162789][ T8612] dump_stack+0x172/0x1f0 [ 81.167123][ T8612] debug_smp_processor_id+0x251/0x280 [ 81.172479][ T8612] dst_cache_get+0x3d/0xb0 [ 81.176928][ T8612] tipc_udp_xmit.isra.0+0xc4/0xb80 [ 81.182046][ T8612] ? kasan_kmalloc+0x9/0x10 [ 81.186531][ T8612] ? tipc_udp_addr2str+0x170/0x170 [ 81.191641][ T8612] ? __copy_skb_header+0x2e8/0x560 [ 81.196750][ T8612] ? __skb_checksum_complete+0x3f0/0x3f0 [ 81.202364][ T8612] ? netdev_alloc_frag+0x1b0/0x1b0 [ 81.207452][ T8612] ? skb_copy_header+0x21/0x2b0 [ 81.212282][ T8612] ? __pskb_copy_fclone+0x516/0xc90 [ 81.217470][ T8612] tipc_udp_send_msg+0x29a/0x4b0 [ 81.222400][ T8612] tipc_bearer_xmit_skb+0x16c/0x360 [ 81.227585][ T8612] tipc_enable_bearer+0xabe/0xd20 [ 81.232606][ T8612] ? __nla_validate_parse+0x2d0/0x1ee0 [ 81.238048][ T8612] ? tipc_bearer_xmit_skb+0x360/0x360 [ 81.243401][ T8612] ? nla_memcpy+0xb0/0xb0 [ 81.247710][ T8612] ? nla_memcpy+0xb0/0xb0 [ 81.252020][ T8612] ? __nla_parse+0x43/0x60 [ 81.256417][ T8612] __tipc_nl_bearer_enable+0x2de/0x3a0 [ 81.261856][ T8612] ? __tipc_nl_bearer_enable+0x2de/0x3a0 [ 81.267467][ T8612] ? tipc_nl_bearer_disable+0x40/0x40 [ 81.272848][ T8612] ? unwind_get_return_address+0x58/0xa0 [ 81.278501][ T8612] ? lock_acquire+0x16f/0x3f0 [ 81.283190][ T8612] tipc_nl_bearer_enable+0x23/0x40 [ 81.288300][ T8612] genl_family_rcv_msg+0x74b/0xf90 [ 81.293404][ T8612] ? genl_unregister_family+0x790/0x790 [ 81.298935][ T8612] ? __lock_acquire+0x54f/0x5490 [ 81.303852][ T8612] ? __netlink_lookup+0x3fa/0x7b0 [ 81.308865][ T8612] genl_rcv_msg+0xca/0x16c [ 81.313266][ T8612] netlink_rcv_skb+0x177/0x450 [ 81.318043][ T8612] ? genl_family_rcv_msg+0xf90/0xf90 [ 81.323311][ T8612] ? netlink_ack+0xb50/0xb50 [ 81.327906][ T8612] ? lock_acquire+0x16f/0x3f0 [ 81.332589][ T8612] ? kasan_check_write+0x14/0x20 [ 81.337511][ T8612] genl_rcv+0x29/0x40 [ 81.341485][ T8612] netlink_unicast+0x531/0x710 [ 81.346268][ T8612] ? netlink_attachskb+0x770/0x770 [ 81.351374][ T8612] ? _copy_from_iter_full+0x25d/0x8c0 [ 81.356765][ T8612] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 81.362479][ T8612] ? __check_object_size+0x3d/0x42f [ 81.367667][ T8612] netlink_sendmsg+0x8ae/0xd70 [ 81.372415][ T8612] ? netlink_unicast+0x710/0x710 [ 81.377520][ T8612] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 81.383051][ T8612] ? apparmor_socket_sendmsg+0x2a/0x30 [ 81.388530][ T8612] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 81.394775][ T8612] ? security_socket_sendmsg+0x8d/0xc0 [ 81.400240][ T8612] ? netlink_unicast+0x710/0x710 [ 81.405161][ T8612] sock_sendmsg+0xd7/0x130 [ 81.409561][ T8612] ___sys_sendmsg+0x803/0x920 [ 81.414220][ T8612] ? copy_msghdr_from_user+0x430/0x430 [ 81.419667][ T8612] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 81.425461][ T8612] ? debug_object_active_state+0x25d/0x380 [ 81.431255][ T8612] ? __lock_acquire+0x54f/0x5490 [ 81.436174][ T8612] ? kasan_check_read+0x11/0x20 [ 81.441208][ T8612] ? _raw_spin_unlock_irqrestore+0xa4/0xe0 [ 81.447008][ T8612] ? mark_held_locks+0xf0/0xf0 [ 81.451768][ T8612] ? __call_rcu.constprop.0+0x28b/0x720 [ 81.457298][ T8612] ? call_rcu+0xb/0x10 [ 81.461353][ T8612] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 81.467589][ T8612] ? __fget_light+0x1a9/0x230 [ 81.472249][ T8612] ? __fdget+0x1b/0x20 [ 81.476301][ T8612] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 81.482545][ T8612] __sys_sendmsg+0x105/0x1d0 [ 81.487115][ T8612] ? __ia32_sys_shutdown+0x80/0x80 [ 81.492208][ T8612] ? blkcg_maybe_throttle_current+0x5e2/0xfb0 [ 81.498272][ T8612] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 81.503726][ T8612] ? do_syscall_64+0x26/0x680 [ 81.508385][ T8612] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 81.51][ T8612] ? do_syscall_64+0x26/0x680 [ 81.519110][ T8612] __x64_sys_sendmsg+0x78/0xb0 [ 81.523862][ T8612] do_syscall_64+0xfd/0x680 [ 81.528352][ T8612] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 81.534234][ T8612] RIP: 0033:0x444679 [ 81.538114][ T8612] 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 1b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 81.557709][ T8612] RSP: 002b:7fff0201a8b8 EFLAGS: 0246 ORIG_RAX: 002e [ 81.566147][ T8612] RAX: ffda RBX: 004002e0 RCX: 00444679 [ 81.574108][ T8612] RDX:
[tipc-discussion] [PATCH 3/3] tipc: fix issue of calling smp_processor_id() in preemptible
syzbot found the following issue: [ 81.119772][ T8612] BUG: using smp_processor_id() in preemptible [] code: syz-executor834/8612 [ 81.136212][ T8612] caller is dst_cache_get+0x3d/0xb0 [ 81.141450][ T8612] CPU: 0 PID: 8612 Comm: syz-executor834 Not tainted 5.2.0-rc6+ #48 [ 81.149435][ T8612] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 81.159480][ T8612] Call Trace: [ 81.162789][ T8612] dump_stack+0x172/0x1f0 [ 81.167123][ T8612] debug_smp_processor_id+0x251/0x280 [ 81.172479][ T8612] dst_cache_get+0x3d/0xb0 [ 81.176928][ T8612] tipc_udp_xmit.isra.0+0xc4/0xb80 [ 81.182046][ T8612] ? kasan_kmalloc+0x9/0x10 [ 81.186531][ T8612] ? tipc_udp_addr2str+0x170/0x170 [ 81.191641][ T8612] ? __copy_skb_header+0x2e8/0x560 [ 81.196750][ T8612] ? __skb_checksum_complete+0x3f0/0x3f0 [ 81.202364][ T8612] ? netdev_alloc_frag+0x1b0/0x1b0 [ 81.207452][ T8612] ? skb_copy_header+0x21/0x2b0 [ 81.212282][ T8612] ? __pskb_copy_fclone+0x516/0xc90 [ 81.217470][ T8612] tipc_udp_send_msg+0x29a/0x4b0 [ 81.222400][ T8612] tipc_bearer_xmit_skb+0x16c/0x360 [ 81.227585][ T8612] tipc_enable_bearer+0xabe/0xd20 [ 81.232606][ T8612] ? __nla_validate_parse+0x2d0/0x1ee0 [ 81.238048][ T8612] ? tipc_bearer_xmit_skb+0x360/0x360 [ 81.243401][ T8612] ? nla_memcpy+0xb0/0xb0 [ 81.247710][ T8612] ? nla_memcpy+0xb0/0xb0 [ 81.252020][ T8612] ? __nla_parse+0x43/0x60 [ 81.256417][ T8612] __tipc_nl_bearer_enable+0x2de/0x3a0 [ 81.261856][ T8612] ? __tipc_nl_bearer_enable+0x2de/0x3a0 [ 81.267467][ T8612] ? tipc_nl_bearer_disable+0x40/0x40 [ 81.272848][ T8612] ? unwind_get_return_address+0x58/0xa0 [ 81.278501][ T8612] ? lock_acquire+0x16f/0x3f0 [ 81.283190][ T8612] tipc_nl_bearer_enable+0x23/0x40 [ 81.288300][ T8612] genl_family_rcv_msg+0x74b/0xf90 [ 81.293404][ T8612] ? genl_unregister_family+0x790/0x790 [ 81.298935][ T8612] ? __lock_acquire+0x54f/0x5490 [ 81.303852][ T8612] ? __netlink_lookup+0x3fa/0x7b0 [ 81.308865][ T8612] genl_rcv_msg+0xca/0x16c [ 81.313266][ T8612] netlink_rcv_skb+0x177/0x450 [ 81.318043][ T8612] ? genl_family_rcv_msg+0xf90/0xf90 [ 81.323311][ T8612] ? netlink_ack+0xb50/0xb50 [ 81.327906][ T8612] ? lock_acquire+0x16f/0x3f0 [ 81.332589][ T8612] ? kasan_check_write+0x14/0x20 [ 81.337511][ T8612] genl_rcv+0x29/0x40 [ 81.341485][ T8612] netlink_unicast+0x531/0x710 [ 81.346268][ T8612] ? netlink_attachskb+0x770/0x770 [ 81.351374][ T8612] ? _copy_from_iter_full+0x25d/0x8c0 [ 81.356765][ T8612] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 81.362479][ T8612] ? __check_object_size+0x3d/0x42f [ 81.367667][ T8612] netlink_sendmsg+0x8ae/0xd70 [ 81.372415][ T8612] ? netlink_unicast+0x710/0x710 [ 81.377520][ T8612] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 81.383051][ T8612] ? apparmor_socket_sendmsg+0x2a/0x30 [ 81.388530][ T8612] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 81.394775][ T8612] ? security_socket_sendmsg+0x8d/0xc0 [ 81.400240][ T8612] ? netlink_unicast+0x710/0x710 [ 81.405161][ T8612] sock_sendmsg+0xd7/0x130 [ 81.409561][ T8612] ___sys_sendmsg+0x803/0x920 [ 81.414220][ T8612] ? copy_msghdr_from_user+0x430/0x430 [ 81.419667][ T8612] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 81.425461][ T8612] ? debug_object_active_state+0x25d/0x380 [ 81.431255][ T8612] ? __lock_acquire+0x54f/0x5490 [ 81.436174][ T8612] ? kasan_check_read+0x11/0x20 [ 81.441208][ T8612] ? _raw_spin_unlock_irqrestore+0xa4/0xe0 [ 81.447008][ T8612] ? mark_held_locks+0xf0/0xf0 [ 81.451768][ T8612] ? __call_rcu.constprop.0+0x28b/0x720 [ 81.457298][ T8612] ? call_rcu+0xb/0x10 [ 81.461353][ T8612] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 81.467589][ T8612] ? __fget_light+0x1a9/0x230 [ 81.472249][ T8612] ? __fdget+0x1b/0x20 [ 81.476301][ T8612] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 81.482545][ T8612] __sys_sendmsg+0x105/0x1d0 [ 81.487115][ T8612] ? __ia32_sys_shutdown+0x80/0x80 [ 81.492208][ T8612] ? blkcg_maybe_throttle_current+0x5e2/0xfb0 [ 81.498272][ T8612] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 81.503726][ T8612] ? do_syscall_64+0x26/0x680 [ 81.508385][ T8612] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 81.51][ T8612] ? do_syscall_64+0x26/0x680 [ 81.519110][ T8612] __x64_sys_sendmsg+0x78/0xb0 [ 81.523862][ T8612] do_syscall_64+0xfd/0x680 [ 81.528352][ T8612] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 81.534234][ T8612] RIP: 0033:0x444679 [ 81.538114][ T8612] 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 1b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 81.557709][ T8612] RSP: 002b:7fff0201a8b8 EFLAGS: 0246 ORIG_RAX: 002e [ 81.566147][ T8612] RAX: ffda RBX: 004002e0 RCX: 00444679 [ 81.574108][ T8612] RDX:
